Add readiness probe to devenv

Cargo.lock

@@ -1700,7 +1700,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "musicfs"
+name = "musicfs-client"
 version = "0.1.0"
 dependencies = [
  "anyhow",
@@ -1712,24 +1712,60 @@ dependencies = [
  "http",
  "libc",
  "log",
+ "musicfs-core",
+ "musicfs-proto",
  "notify",
- "prost",
  "sea-orm",
- "symphonia",
  "tempfile",
- "time",
  "tokio",
  "tokio-stream",
  "tonic",
  "tonic-health",
- "tonic-prost",
  "tonic-reflection",
  "tracing",
+ "twox-hash",
+]
+
+[[package]]
+name = "musicfs-core"
+version = "0.1.0"
+dependencies = [
+ "symphonia",
+ "tempfile",
+ "tracing",
  "tracing-appender",
  "tracing-subscriber",
  "twox-hash",
 ]
 
+[[package]]
+name = "musicfs-proto"
+version = "0.1.0"
+dependencies = [
+ "prost",
+ "tonic",
+ "tonic-prost",
+]
+
+[[package]]
+name = "musicfs-server"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "async-trait",
+ "clap",
+ "musicfs-core",
+ "musicfs-proto",
+ "notify",
+ "tempfile",
+ "tokio",
+ "tokio-stream",
+ "tonic",
+ "tonic-health",
+ "tonic-reflection",
+ "tracing",
+]
+
 [[package]]
 name = "nix"
 version = "0.29.0"

Cargo.toml

@@ -1,57 +1,51 @@
-[package]
-name = "musicfs"
+[workspace]
+members = [
+    "crates/musicfs-proto",
+    "crates/musicfs-core",
+    "crates/musicfs-server",
+    "crates/musicfs-client",
+]
+resolver = "2"
+
+[workspace.package]
 version = "0.1.0"
 edition = "2024"
-# `cargo run` (and devenv's `cargo run -- ...`) picks the FUSE binary, not
-# musicfs-server, when two [[bin]] targets exist.
-default-run = "musicfs"
 
-[lib]
-name = "musicfs"
-path = "src/lib.rs"
+[workspace.dependencies]
+musicfs-proto = { path = "crates/musicfs-proto" }
+musicfs-core = { path = "crates/musicfs-core" }
 
-[[bin]]
-name = "musicfs"
-path = "src/main.rs"
+prost = "0.14"
+tonic = "0.14"
+tonic-prost = "0.14"
+tonic-health = "0.14"
+tonic-reflection = "0.14"
 
-[[bin]]
-name = "musicfs-server"
-path = "src/bin/musicfs-server.rs"
-
-[dependencies]
-clap = { version = "4.6.1", features = ["derive"] }
-fuser = "0.17.0"
-libc = "0.2.186"
-notify = "8.2.0"
-time = "0.3.49"
 symphonia = { version = "0.5", default-features = false, features = [
-    "aac", "alac", "flac", "mp3", "ogg", "vorbis", "wav"
+    "aac", "alac", "flac", "mp3", "ogg", "vorbis", "wav",
 ] }
 twox-hash = "2.1.2"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
+tracing-appender = "0.2.5"
 
-sea-orm = { version = "2.0.0-rc", features = [ "sqlx-postgres", "runtime-tokio", "macros" ] }
-tokio = { version = "1", features = ["macros", "rt-multi-thread", "signal", "fs", "io-util", "sync"] }
-
+tokio = { version = "1", features = [
+    "macros", "rt-multi-thread", "signal", "fs", "io-util", "sync",
+] }
 anyhow = "1"
 async-trait = "0.1"
-bytes = "1"
-tonic = "0.14"
-tonic-health = "0.14"
-tonic-prost = "0.14"
-tonic-reflection = "0.14"
-prost = "0.14"
+clap = { version = "4.6.1", features = ["derive"] }
+notify = "8.2.0"
 tokio-stream = "0.1"
+
+fuser = "0.17.0"
+libc = "0.2.186"
+sea-orm = { version = "2.0.0-rc", features = [
+    "sqlx-postgres", "runtime-tokio", "macros",
+] }
+log = "0.4"
+bytes = "1"
 http = "1"
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
 
-tracing = "0.1"
-# For sea_orm's ConnectOptions::sqlx_logging_level, which takes a log::LevelFilter.
-log = "0.4"
-tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
-# Pinned to 0.2.5: Builder::max_log_files (used for retention) landed in the
-# 0.2.3 Builder API and is current here. An unqualified "0.2" could otherwise
-# resolve to an older patch without the retention method.
-tracing-appender = "0.2.5"
-
-[dev-dependencies]
 tempfile = "3"

README.org

@@ -1,13 +1,97 @@
 #+title: musicfs
 
-* Incus server VM
+A read-only FUSE filesystem that presents a music library reorganised by
+*metadata* rather than by however the files happen to sit on disk. Point it at a
+messy ~~/Music~ tree (or a remote ~musicfs-server~) and it mounts a clean
+=Artist/Album/Track= view, driven entirely by the tags parsed out of the audio
+files themselves.
+
+#+begin_example
+mountpoint/
+├── ДДТ/
+│   └── Творчество в пустоте/
+│       ├── 01 Intro.flac
+│       └── 02 ...
+└── Some Artist/
+    └── Some Album/
+        └── 01 Track.flac
+#+end_example
+
+The source files are never moved or modified. The directory hierarchy is
+*virtual*: synthesised from ~album_artist~/~album~ tags, with stable synthetic
+inodes so the layout survives remounts.
+
+* How it works
+
+Two *origins* feed the same FUSE frontend:
+
+- *LocalOrigin* — walks a directory on the host, parses tags, builds the
+  snapshot. A =notify= watcher keeps it live as files change.
+- *NetworkOrigin* — talks gRPC to a remote ~musicfs-server~. Metadata and file
+  bytes arrive over the wire; a Postgres table caches both. Reconciliation is
+  hash-based: the client sends the ~(inode, hash)~ pairs it has, the server
+  replies with only what changed or was deleted, so almost nothing crosses the
+  network on a steady-state refresh.
+
+Which one is used is chosen automatically from the ~--source~ argument: an
+=http(s)://= URL means network, anything else is treated as a local path.
+
+State lives in Postgres — parsed metadata, the virtual-path layout, and (for the
+network origin) a lazy byte cache populated only for files that were actually
+read.
+
+* Layout
+
+| Crate            | Responsibility                                                        |
+|------------------+-----------------------------------------------------------------------|
+| =musicfs-proto=  | Protobuf/gRPC definitions (=proto/musicfs.proto=), generated bindings |
+| =musicfs-core=   | Shared logic: tag parsing (FLAC/MP3 via symphonia), hashing, logging  |
+| =musicfs-client= | FUSE mount, origins, Postgres cache/sync — the =musicfs= binary       |
+| =musicfs-server= | gRPC server sharing a library — the =musicfs-server= binary           |
+
+The gRPC surface (see =proto/musicfs.proto=): ~Reconcile~, ~GetMetadata~,
+~GetManifest~, ~GetFile~ (whole-file or byte-range streaming), and
+~SubscribeEvents~ (change wake-ups). The client also serves a ~ClientStatus~ RPC
+for introspection.
+
+* Running the client
+
+Everything runs inside the =devenv= shell, which provides the Rust toolchain,
+Postgres, FUSE tooling, and gRPC utilities.
+
+#+begin_src bash
+devenv shell
+devenv up --profile local     # starts Postgres + the FUSE mount
+#+end_src
+
+Predefined profiles in =devenv.nix=:
+
+| Profile   | Source                          | Purpose                       |
+|-----------+---------------------------------+-------------------------------|
+| =local=   | a local directory               | mount a host music folder     |
+| =remote=  | =http://…:50051=                | mount a remote musicfs-server |
+| =e2e=     | =http://127.0.0.1:50061=        | end-to-end test harness       |
+
+Or run the binary directly:
+
+#+begin_src bash
+cargo run -p musicfs-client -- \
+  --source /home/you/Music \
+  --mountpoint /tmp/musicfs \
+  --database "postgresql://you@localhost/musicfs?host=$PGHOST"
+#+end_src
+
+Key flags: =--source= (local path or ~http(s)://~ server URL), =--mountpoint=,
+=--database= (Postgres URL), =--log-dir= (daily-rotated logs, default =./logs=),
+=--listen= (address for the client's status/health RPCs, default
+=127.0.0.1:50052=).
+
+* Running the server in an Incus VM
 
 ~musicfs-server~ (gRPC) runs inside an Incus VM, live-sharing the host's
-~~/Music~ as a readonly virtiofs mount. =scripts/vm.sh= builds the binary on the
-host, bundles its nix ~glibc~ so it runs unmodified in the VM, ships it in, and
-runs it under systemd.
-
-** Setup
+~~/Music~ as a read-only virtiofs mount. =scripts/vm.sh= builds the binary on
+the host, bundles its nix ~glibc~ so it runs unmodified in the VM, ships it in,
+and runs it under systemd.
 
 #+begin_src bash
 devenv shell        # cargo, incus, patchelf, grpcurl
@@ -16,17 +100,19 @@ scripts/vm.sh up    # create VM, share ~/Music, build, ship, start server
 
 Options (env): =VM_NAME=, =IMAGE=, =MUSIC_SOURCE=, =LISTEN_PORT=, =RUST_LOG=.
 
-| Command                  | Action                        |
-|--------------------------+-------------------------------|
-| =scripts/vm.sh up=         | create + build + ship + start |
-| =scripts/vm.sh redeploy=   | rebuild after a code change   |
-| =scripts/vm.sh logs=       | tail server logs              |
-| =scripts/vm.sh status=     | VM + service status           |
-| =scripts/vm.sh shell=      | shell inside the VM           |
-| =scripts/vm.sh down=       | stop the VM                   |
-| =scripts/vm.sh destroy=    | delete the VM                 |
+| Command                | Action                        |
+|------------------------+-------------------------------|
+| =scripts/vm.sh up=       | create + build + ship + start |
+| =scripts/vm.sh redeploy= | rebuild after a code change   |
+| =scripts/vm.sh logs=     | tail server logs              |
+| =scripts/vm.sh status=   | VM + service status           |
+| =scripts/vm.sh shell=    | shell inside the VM           |
+| =scripts/vm.sh down=     | stop the VM                   |
+| =scripts/vm.sh destroy=  | delete the VM                 |
 
-** Test it (Nushell)
+Reach the server at the VM's bridge IP (=scripts/vm.sh status= prints it).
+
+** Poke at it (Nushell)
 
 #+begin_src nushell
 let VMIP = (incus list musicfs -f csv -c 4 | lines | first | split row " " | first)
@@ -46,9 +132,20 @@ incus exec musicfs -- find /music -type f | lines | length
 incus exec musicfs -- cat "/music/DDT/ДДТ - Творчество в пустоте – 2 - 01 Intro.flac" | ^mpv -
 #+end_src
 
-Reach the server at the VM's bridge IP (=scripts/vm.sh status= prints it).
 Install mpv with =nix profile install nixpkgs#mpv=, or use =^ffplay -= instead.
 
 In Nushell, always put =| lines= between an external command's stdout and a
-builtin (=find=, =first=, =length=, ...); external-to-external pipes (=cat |
-mpv=) are byte-stable and don't need it.
+builtin (=find=, =first=, =length=, …); external-to-external pipes (=cat | mpv=)
+are byte-stable and don't need it.
+
+* Development
+
+#+begin_src bash
+just build            # cargo build
+cargo test            # unit tests
+just e2e              # end-to-end suite (scripts/e2e/run.sh)
+just e2e-resilience   # resilience suite
+#+end_src
+
+Formatting and lint (clippy, treefmt with rustfmt + nixfmt) run as git hooks via
+=devenv=. Requires Rust edition 2024.

crates/musicfs-client/Cargo.toml

@@ -0,0 +1,39 @@
+[package]
+name = "musicfs-client"
+version.workspace = true
+edition.workspace = true
+default-run = "musicfs"
+
+[lib]
+name = "musicfs"
+path = "src/lib.rs"
+
+[[bin]]
+name = "musicfs"
+path = "src/main.rs"
+
+[dependencies]
+musicfs-core.workspace = true
+musicfs-proto.workspace = true
+fuser.workspace = true
+libc.workspace = true
+sea-orm.workspace = true
+tokio.workspace = true
+anyhow.workspace = true
+async-trait.workspace = true
+clap.workspace = true
+notify.workspace = true
+tokio-stream.workspace = true
+tonic.workspace = true
+tonic-health.workspace = true
+tonic-reflection.workspace = true
+bytes.workspace = true
+http.workspace = true
+tracing.workspace = true
+log.workspace = true
+twox-hash.workspace = true
+chrono.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
+sea-orm = { workspace = true, features = ["mock"] }

crates/musicfs-client/src/control.rs

@@ -0,0 +1,248 @@
+use std::{
+    collections::BTreeMap,
+    path::PathBuf,
+    sync::{Arc, Mutex},
+};
+
+use fuser::INodeNo;
+use musicfs_core::music::encoder::MusicMetadataEncoderFactory;
+use musicfs_proto::{
+    ClientControl, FileEntry, FileMetadata, GetMusicMetadataRequest, GetMusicMetadataResponse,
+    ListFilesRequest, ListFilesResponse, MusicMetadata as ProtoMusicMetadata, PictureDataRange,
+    UpdateMusicMetadataRequest, UpdateMusicMetadataResponse,
+};
+use sea_orm::{ActiveModelTrait, DatabaseConnection, EntityTrait};
+use tonic::{Request, Response, Status};
+
+use crate::db::entities;
+use crate::item::{FileType, Item};
+use crate::music::db::save_music_metadata;
+use crate::music::metadata::MusicMetadata;
+use crate::virtual_dirs::{
+    compute_new_layout, ensure_virtual_dirs, find_orphaned_dirs, parent_inode_from_path,
+};
+
+pub struct ClientControlServiceImpl {
+    files: Arc<Mutex<BTreeMap<INodeNo, Item>>>,
+    db: DatabaseConnection,
+}
+
+impl ClientControlServiceImpl {
+    pub fn new(files: Arc<Mutex<BTreeMap<INodeNo, Item>>>, db: DatabaseConnection) -> Self {
+        ClientControlServiceImpl { files, db }
+    }
+}
+
+#[tonic::async_trait]
+impl ClientControl for ClientControlServiceImpl {
+    async fn get_music_metadata(
+        &self,
+        request: Request<GetMusicMetadataRequest>,
+    ) -> Result<Response<GetMusicMetadataResponse>, Status> {
+        let inode = INodeNo(request.into_inner().inode);
+        let metadata = {
+            let files = self.files.lock().unwrap();
+            let item = files
+                .get(&inode)
+                .ok_or_else(|| Status::not_found(format!("inode {} not found", inode.0)))?;
+            item.music_metadata.clone().ok_or_else(|| {
+                Status::not_found(format!("inode {} has no music metadata", inode.0))
+            })?
+        };
+        Ok(Response::new(GetMusicMetadataResponse {
+            metadata: Some(music_metadata_to_proto(metadata)),
+        }))
+    }
+
+    async fn update_music_metadata(
+        &self,
+        request: Request<UpdateMusicMetadataRequest>,
+    ) -> Result<Response<UpdateMusicMetadataResponse>, Status> {
+        let req = request.into_inner();
+        let inode = INodeNo(req.inode);
+
+        let outcome = {
+            let mut files = self.files.lock().unwrap();
+
+            let (old_local_path, current_name, source_for_virtual_dirs) = {
+                let root = files.get(&INodeNo::ROOT);
+                let item = files
+                    .get(&inode)
+                    .ok_or_else(|| Status::not_found(format!("inode {} not found", inode.0)))?;
+                let source = root
+                    .map(|r| r.original_path.clone())
+                    .unwrap_or_else(|| PathBuf::from("/"));
+                (item.local_path.clone(), item.name.clone(), source)
+            };
+
+            // Phase 1: mutate the music metadata and re-encode the header.
+            // Done in its own scope so the mutable borrow on `files` is
+            // released before we touch `files` again for layout changes.
+            let (updated_mm, _encoder_extension_source) = {
+                let item = files
+                    .get_mut(&inode)
+                    .ok_or_else(|| Status::not_found(format!("inode {} not found", inode.0)))?;
+                let mm = item.music_metadata.as_mut().ok_or_else(|| {
+                    Status::not_found(format!("inode {} has no music metadata", inode.0))
+                })?;
+                apply_update(mm, req);
+                let encoder =
+                    MusicMetadataEncoderFactory::for_path(&item.local_path).ok_or_else(|| {
+                        Status::failed_precondition(format!(
+                            "no encoder for file type: {}",
+                            item.local_path.display()
+                        ))
+                    })?;
+                encoder.encode(mm);
+                (mm.clone(), item.local_path.clone())
+            };
+
+            // Phase 2: compute new layout, write it onto the item, then
+            // ensure new virtual dirs and prune orphans. A fresh mutable
+            // borrow is fine because phase 1's borrow has been released.
+            let (new_name, new_local_path) = compute_new_layout(&current_name, &updated_mm);
+            {
+                let item = files
+                    .get_mut(&inode)
+                    .ok_or_else(|| Status::not_found(format!("inode {} not found", inode.0)))?;
+                item.name = new_name.clone();
+                item.local_path = new_local_path.clone();
+                item.parent_inode = parent_inode_from_path(&new_local_path);
+            }
+            ensure_virtual_dirs(&new_local_path, &source_for_virtual_dirs, &mut files);
+
+            let orphaned = find_orphaned_dirs(&files, inode, &old_local_path);
+            for dir_inode in &orphaned {
+                files.remove(dir_inode);
+            }
+
+            UpdateOutcome {
+                metadata: updated_mm,
+                new_name,
+                new_local_path,
+                orphaned_dirs: orphaned,
+            }
+        };
+
+        save_music_metadata(inode.0 as i64, &outcome.metadata, &self.db)
+            .await
+            .map_err(|e| Status::internal(format!("DB save failed: {e}")))?;
+
+        persist_layout_changes(
+            &self.db,
+            inode.0 as i64,
+            &outcome.new_name,
+            &outcome.new_local_path,
+            &outcome.orphaned_dirs,
+        )
+        .await
+        .map_err(|e| Status::internal(format!("DB layout save failed: {e}")))?;
+
+        tracing::debug!(
+            ino = inode.0,
+            orphaned_dirs = outcome.orphaned_dirs.len(),
+            "control: music metadata updated, layout recomputed"
+        );
+
+        Ok(Response::new(UpdateMusicMetadataResponse {
+            metadata: Some(music_metadata_to_proto(outcome.metadata)),
+        }))
+    }
+
+    async fn list_files(
+        &self,
+        _request: Request<ListFilesRequest>,
+    ) -> Result<Response<ListFilesResponse>, Status> {
+        let entries: Vec<FileEntry> = {
+            let files = self.files.lock().unwrap();
+            files
+                .values()
+                .filter(|item| item.file_type == FileType::File)
+                .map(|item| FileEntry {
+                    inode: item.inode.0,
+                    original_path: item.original_path.to_string_lossy().into_owned(),
+                    local_path: item.local_path.to_string_lossy().into_owned(),
+                    name: item.name.clone(),
+                    metadata: item
+                        .music_metadata
+                        .as_ref()
+                        .map(|mm| music_metadata_to_file_metadata(mm)),
+                })
+                .collect()
+        };
+        Ok(Response::new(ListFilesResponse { files: entries }))
+    }
+}
+
+fn music_metadata_to_file_metadata(mm: &MusicMetadata) -> FileMetadata {
+    FileMetadata {
+        artist: mm.artist.clone(),
+        album_artist: mm.album_artist.clone(),
+        album: mm.album.clone(),
+        track_number: mm.track_number,
+        track_title: mm.track_title.clone(),
+        other_tags: mm.other_tags.clone(),
+    }
+}
+
+fn music_metadata_to_proto(mm: crate::music::metadata::MusicMetadata) -> ProtoMusicMetadata {
+    ProtoMusicMetadata {
+        artist: mm.artist,
+        album_artist: mm.album_artist,
+        album: mm.album,
+        track_number: mm.track_number,
+        track_title: mm.track_title,
+        other_tags: mm.other_tags,
+        header: mm.header,
+        picture_block_headers: mm.picture_block_headers,
+        picture_data_ranges: mm
+            .picture_data_ranges
+            .into_iter()
+            .map(|(offset, length)| PictureDataRange { offset, length })
+            .collect(),
+        real_audio_start: mm.real_audio_start,
+        vorbis_comment_offset: mm.vorbis_comment_offset,
+        vorbis_comment_length: mm.vorbis_comment_length,
+    }
+}
+
+struct UpdateOutcome {
+    metadata: MusicMetadata,
+    new_name: String,
+    new_local_path: PathBuf,
+    orphaned_dirs: Vec<INodeNo>,
+}
+
+fn apply_update(mm: &mut MusicMetadata, req: UpdateMusicMetadataRequest) {
+    mm.artist = req.artist;
+    mm.album_artist = req.album_artist;
+    mm.album = req.album;
+    mm.track_number = req.track_number;
+    mm.track_title = req.track_title;
+    mm.other_tags = req.other_tags;
+}
+
+async fn persist_layout_changes(
+    db: &DatabaseConnection,
+    inode: i64,
+    new_name: &str,
+    new_local_path: &std::path::Path,
+    orphaned_dirs: &[INodeNo],
+) -> Result<(), sea_orm::DbErr> {
+    use sea_orm::ActiveValue::Set;
+    let new_local_path_str = new_local_path.to_string_lossy().into_owned();
+    let update = entities::ActiveModel {
+        inode: Set(inode),
+        name: Set(new_name.to_string()),
+        local_path: Set(new_local_path_str),
+        ..Default::default()
+    };
+    update.update(db).await?;
+
+    for dir_inode in orphaned_dirs {
+        let _ = entities::Entity::delete_by_id(dir_inode.0 as i64)
+            .exec(db)
+            .await;
+    }
+    Ok(())
+}

crates/musicfs-client/src/health.rs

@@ -0,0 +1,165 @@
+use std::{
+    collections::BTreeMap,
+    net::SocketAddr,
+    sync::{
+        Arc, Mutex,
+        atomic::{AtomicBool, Ordering},
+    },
+    time::{SystemTime, UNIX_EPOCH},
+};
+
+use fuser::INodeNo;
+use musicfs_proto::{
+    ClientControlServer, ClientStatus, ClientStatusResponse, ClientStatusServer,
+    GetClientStatusRequest,
+};
+use tokio::time::Duration;
+use tonic::{Request, Response, transport::Server};
+
+#[derive(Clone)]
+pub struct ServerStatus {
+    connected: Arc<AtomicBool>,
+    last_reconcile: Arc<Mutex<Option<i64>>>,
+    origin_type: String,
+    mountpoint: String,
+    server_endpoint: String,
+}
+
+impl ServerStatus {
+    pub fn new_network(mountpoint: String, server_endpoint: String) -> Self {
+        ServerStatus {
+            connected: Arc::new(AtomicBool::new(false)),
+            last_reconcile: Arc::new(Mutex::new(None)),
+            origin_type: "network".to_string(),
+            mountpoint,
+            server_endpoint,
+        }
+    }
+
+    pub fn new_local(mountpoint: String) -> Self {
+        ServerStatus {
+            connected: Arc::new(AtomicBool::new(true)),
+            last_reconcile: Arc::new(Mutex::new(None)),
+            origin_type: "local".to_string(),
+            mountpoint,
+            server_endpoint: String::new(),
+        }
+    }
+
+    pub fn set_connected(&self, connected: bool) {
+        self.connected.store(connected, Ordering::Relaxed);
+    }
+
+    pub fn mark_reconciled(&self) {
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .map(|d| d.as_secs() as i64)
+            .unwrap_or(0);
+        *self.last_reconcile.lock().unwrap() = Some(now);
+    }
+
+    pub fn is_server_connected(&self) -> bool {
+        self.connected.load(Ordering::Relaxed)
+    }
+}
+
+pub async fn spawn_grpc_server(
+    addr: SocketAddr,
+    status: ServerStatus,
+    files: Arc<Mutex<BTreeMap<INodeNo, crate::item::Item>>>,
+    db: sea_orm::DatabaseConnection,
+) {
+    let (reporter, health_service) = tonic_health::server::health_reporter();
+    reporter
+        .set_serving::<ClientStatusServer<ClientStatusServiceImpl>>()
+        .await;
+
+    let reporter_clone = reporter.clone();
+    let status_clone = status.clone();
+    tokio::spawn(async move {
+        let mut was_connected = status_clone.is_server_connected();
+        loop {
+            tokio::time::sleep(Duration::from_secs(2)).await;
+            let now_connected = status_clone.is_server_connected();
+            if now_connected != was_connected {
+                if now_connected {
+                    reporter_clone
+                        .set_serving::<ClientStatusServer<ClientStatusServiceImpl>>()
+                        .await;
+                } else {
+                    reporter_clone
+                        .set_not_serving::<ClientStatusServer<ClientStatusServiceImpl>>()
+                        .await;
+                }
+                was_connected = now_connected;
+            }
+        }
+    });
+
+    let reflection_v1 = tonic_reflection::server::Builder::configure()
+        .register_encoded_file_descriptor_set(musicfs_proto::musicfs::FILE_DESCRIPTOR_SET)
+        .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
+        .build_v1()
+        .expect("build reflection v1");
+
+    let reflection_v1alpha = tonic_reflection::server::Builder::configure()
+        .register_encoded_file_descriptor_set(musicfs_proto::musicfs::FILE_DESCRIPTOR_SET)
+        .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
+        .build_v1alpha()
+        .expect("build reflection v1alpha");
+
+    let status_svc = ClientStatusServer::new(ClientStatusServiceImpl {
+        status,
+        files: files.clone(),
+    });
+    let control_svc =
+        ClientControlServer::new(crate::control::ClientControlServiceImpl::new(files, db));
+
+    tracing::info!(%addr, "health server listening");
+
+    tokio::spawn(async move {
+        if let Err(e) = Server::builder()
+            .add_service(health_service)
+            .add_service(status_svc)
+            .add_service(reflection_v1)
+            .add_service(reflection_v1alpha)
+            .add_service(control_svc)
+            .serve(addr)
+            .await
+        {
+            tracing::error!(error = %e, "health server ended with error");
+        }
+    });
+}
+
+struct ClientStatusServiceImpl {
+    status: ServerStatus,
+    files: Arc<Mutex<BTreeMap<INodeNo, crate::item::Item>>>,
+}
+
+#[tonic::async_trait]
+impl ClientStatus for ClientStatusServiceImpl {
+    async fn get_client_status(
+        &self,
+        _request: Request<GetClientStatusRequest>,
+    ) -> Result<Response<ClientStatusResponse>, tonic::Status> {
+        let file_count = self
+            .files
+            .lock()
+            .unwrap()
+            .values()
+            .filter(|i| i.file_type == crate::item::FileType::File)
+            .count() as u64;
+
+        let last_reconcile_unix = self.status.last_reconcile.lock().unwrap().unwrap_or(0);
+
+        Ok(Response::new(ClientStatusResponse {
+            origin_type: self.status.origin_type.clone(),
+            mountpoint: self.status.mountpoint.clone(),
+            file_count,
+            server_connected: self.status.is_server_connected(),
+            server_endpoint: self.status.server_endpoint.clone(),
+            last_reconcile_unix,
+        }))
+    }
+}

crates/musicfs-client/src/item.rs

@@ -1,5 +1,4 @@
 use std::{
-    hash::Hasher,
     path::PathBuf,
     time::{SystemTime, UNIX_EPOCH},
 };
@@ -7,7 +6,6 @@ use std::{
 use std::os::unix::ffi::OsStrExt;
 
 use fuser::INodeNo;
-use twox_hash::XxHash64;
 
 use crate::music::metadata::MusicMetadata;
 use crate::origins::attrs::FileAttrs;
@@ -38,27 +36,6 @@ fn secs_since_epoch(time: SystemTime) -> u64 {
         .unwrap_or(0);
 }
 
-/// Hash inputs shared by every Item regardless of origin. Server manifests
-/// and client Items both feed these same five values through xxhash, so a
-/// file's hash is identical on both sides — that's what makes `Reconcile`'s
-/// diff correct.
-pub fn compute_item_hash(
-    inode: u64,
-    original_path: &[u8],
-    ctime_secs: u64,
-    mtime_secs: u64,
-    crtime_secs: u64,
-) -> u64 {
-    let seed = 1234;
-    let mut hasher = XxHash64::with_seed(seed);
-    hasher.write_u64(inode);
-    hasher.write(original_path);
-    hasher.write_u64(ctime_secs);
-    hasher.write_u64(mtime_secs);
-    hasher.write_u64(crtime_secs);
-    return hasher.finish();
-}
-
 impl Item {
     #[allow(clippy::too_many_arguments)]
     pub fn new(
@@ -88,13 +65,13 @@ impl Item {
     }
 
     pub fn compute_hash(&self) -> u64 {
-        return compute_item_hash(
+        musicfs_core::compute_item_hash(
             self.inode.0,
             self.original_path.as_os_str().as_bytes(),
             secs_since_epoch(self.attrs.ctime),
             secs_since_epoch(self.attrs.mtime),
             secs_since_epoch(self.attrs.crtime),
-        );
+        )
     }
 }
 

crates/musicfs-client/src/lib.rs

@@ -0,0 +1,10 @@
+pub mod control;
+pub mod db;
+pub mod health;
+pub mod item;
+pub mod music;
+pub mod origins;
+pub mod virtual_dirs;
+
+pub use musicfs_core::logging;
+pub use musicfs_proto as proto;

crates/musicfs-client/src/main.rs

@@ -1,9 +1,10 @@
-use std::{collections::HashMap, path::Path, sync::Arc};
+use std::{collections::HashMap, net::SocketAddr, path::Path, sync::Arc};
 
 use clap::Parser;
 use fuser::INodeNo;
 use musicfs::db::entities::{Entity, Model};
 use musicfs::db::sync::sync_items_to_db;
+use musicfs::health::ServerStatus;
 use musicfs::item::Item;
 use musicfs::logging::{LogConfig, init};
 use musicfs::music::db::restore_music_metadata_from_db;
@@ -32,6 +33,10 @@ struct Args {
     /// Directory for daily-rotated log files.
     #[arg(long, default_value = "./logs")]
     log_dir: std::path::PathBuf,
+
+    /// gRPC server address for health, status, and control RPCs.
+    #[arg(long, default_value = "127.0.0.1:50052")]
+    listen: SocketAddr,
 }
 
 #[tokio::main]
@@ -68,21 +73,25 @@ async fn main() {
         });
     info!(database = %args.database, "database connected");
 
-    let (snapshot, byte_source, watcher) = if looks_like_url(&args.source) {
+    let (snapshot, byte_source, watcher, server_status) = if looks_like_url(&args.source) {
         debug!(source = %args.source, "using NetworkOrigin");
         let origin = NetworkOrigin::new(args.source.clone(), mountpoint.clone(), db.clone())
             .unwrap_or_else(|e| {
                 error!(source = %args.source, error = %e, "network origin init failed");
                 panic!("network origin init: {e}");
             });
-        // Await directly on this runtime; the sync `snapshot()` wrapper would
-        // try to build a nested runtime and panic (we're inside #[tokio::main]).
+        let server_status = origin.server_status();
         let snapshot = origin.snapshot_async().await.unwrap_or_else(|e| {
             error!(source = %args.source, error = %e, "network initial snapshot failed");
             panic!("network initial snapshot: {e}");
         });
         info!(files = snapshot.len(), "network snapshot complete");
-        (snapshot, origin.byte_source(), origin.watcher())
+        (
+            snapshot,
+            origin.byte_source(),
+            origin.watcher(),
+            server_status,
+        )
     } else {
         debug!(source = %args.source, "using LocalOrigin");
         let origin = LocalOrigin::new(args.source.clone(), mountpoint.clone());
@@ -106,12 +115,20 @@ async fn main() {
         restore_virtual_paths(&mut snapshot, &db_items, Path::new(&args.source));
 
         info!(files = snapshot.len(), "local snapshot complete");
-        (snapshot, origin.byte_source(), origin.watcher())
+        let server_status = ServerStatus::new_local(mountpoint.clone());
+        (
+            snapshot,
+            origin.byte_source(),
+            origin.watcher(),
+            server_status,
+        )
     };
 
     let files: Arc<std::sync::Mutex<std::collections::BTreeMap<INodeNo, Item>>> =
         Arc::new(std::sync::Mutex::new(snapshot));
     let watcher_handle = watcher.watch(files.clone());
+    let health_files = files.clone();
+    let grpc_db = db.clone();
 
     let fs = FuseFs {
         files,
@@ -127,6 +144,8 @@ async fn main() {
     });
     info!(mountpoint = %mountpoint, "FUSE mounted");
 
+    musicfs::health::spawn_grpc_server(args.listen, server_status, health_files, grpc_db).await;
+
     let mut sigint = signal(SignalKind::interrupt()).unwrap_or_else(|e| {
         error!(error = %e, "failed to register SIGINT handler");
         panic!("register SIGINT handler: {e}");

crates/musicfs-client/src/music/db.rs

@@ -6,11 +6,93 @@ use sea_orm::entity::prelude::*;
 use crate::db::entities::Model;
 use crate::item::Item;
 use crate::music::metadata::MusicMetadata;
-use crate::music::metadata::db::{
-    artists, music_metadata as music_metadata_entity, other_tags, pictures,
-};
 use tracing::{debug, error};
 
+pub mod entities {
+    pub mod music_metadata {
+        use sea_orm::entity::prelude::*;
+
+        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+        #[sea_orm(table_name = "music_metadata")]
+        pub struct Model {
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub inode: i64,
+            pub track_title: String,
+            pub album: String,
+            pub track_number: i32,
+            #[sea_orm(column_type = "Blob")]
+            pub header: Vec<u8>,
+            pub real_audio_start: i64,
+        }
+
+        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+        pub enum Relation {}
+
+        impl ActiveModelBehavior for ActiveModel {}
+    }
+
+    pub mod artists {
+        use sea_orm::entity::prelude::*;
+
+        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+        #[sea_orm(table_name = "music_metadata_artists")]
+        pub struct Model {
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub inode: i64,
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub artist: String,
+        }
+
+        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+        pub enum Relation {}
+
+        impl ActiveModelBehavior for ActiveModel {}
+    }
+
+    pub mod other_tags {
+        use sea_orm::entity::prelude::*;
+
+        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+        #[sea_orm(table_name = "music_metadata_other_tags")]
+        pub struct Model {
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub inode: i64,
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub position: i32,
+            pub tag: String,
+        }
+
+        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+        pub enum Relation {}
+
+        impl ActiveModelBehavior for ActiveModel {}
+    }
+
+    pub mod pictures {
+        use sea_orm::entity::prelude::*;
+
+        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+        #[sea_orm(table_name = "music_metadata_pictures")]
+        pub struct Model {
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub inode: i64,
+            #[sea_orm(primary_key, auto_increment = false)]
+            pub position: i32,
+            #[sea_orm(column_type = "Blob")]
+            pub block_header: Vec<u8>,
+            pub data_offset: i64,
+            pub data_length: i64,
+        }
+
+        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+        pub enum Relation {}
+
+        impl ActiveModelBehavior for ActiveModel {}
+    }
+}
+
+use entities::{artists, music_metadata as music_metadata_entity, other_tags, pictures};
+
 pub async fn save_music_metadata(
     inode: i64,
     music_metadata: &MusicMetadata,

crates/musicfs-client/src/music/mod.rs

@@ -0,0 +1,2 @@
+pub mod db;
+pub use musicfs_core::music::{metadata, parse};

crates/musicfs-client/src/origins/mod.rs

@@ -1,4 +1,4 @@
-pub mod attrs;
+pub use musicfs_core::attrs;
 pub mod local;
 pub mod network;
 

crates/musicfs-client/src/origins/network/mod.rs

@@ -29,17 +29,11 @@ use self::transport::NetworkTransport;
 pub struct NetworkOrigin {
     pub(crate) endpoint: String,
     pub(crate) destination: PathBuf,
-    /// Handle to the process-wide runtime (main's `#[tokio::main]`). Used by the
-    /// sync FUSE byte/watcher paths to drive async transport via `block_on`.
-    /// A Handle (not an owned Runtime) so dropping NetworkOrigin in async
-    /// context can't panic, and the runtime outlives any clones we hand out.
     handle: tokio::runtime::Handle,
     transport: NetworkTransport,
     client: sea_orm::DatabaseConnection,
-    /// In-memory cache of the latest manifest, keyed by server id. Written by
-    /// `snapshot()`, read by the watcher to know what state to reconcile
-    /// against on the next pass without round-tripping through the DB.
     latest_manifest: Arc<RwLock<BTreeMap<u64, ProtoManifestEntry>>>,
+    server_status: crate::health::ServerStatus,
 }
 
 impl std::fmt::Debug for NetworkOrigin {
@@ -58,9 +52,10 @@ impl NetworkOrigin {
         destination: String,
         client: sea_orm::DatabaseConnection,
     ) -> io::Result<Self> {
-        // Must be called from within the process runtime (main's #[tokio::main]).
         let handle = tokio::runtime::Handle::current();
         let transport = NetworkTransport::new(endpoint.clone()).map_err(io_err)?;
+        let server_status =
+            crate::health::ServerStatus::new_network(destination.clone(), endpoint.clone());
         return Ok(NetworkOrigin {
             endpoint,
             destination: destination.into(),
@@ -68,12 +63,17 @@ impl NetworkOrigin {
             transport,
             client,
             latest_manifest: Arc::new(RwLock::new(BTreeMap::new())),
+            server_status,
         });
     }
 
     pub fn runtime_handle(&self) -> tokio::runtime::Handle {
         return self.handle.clone();
     }
+
+    pub fn server_status(&self) -> crate::health::ServerStatus {
+        self.server_status.clone()
+    }
 }
 
 impl Origin for NetworkOrigin {
@@ -96,6 +96,7 @@ impl Origin for NetworkOrigin {
             self.client.clone(),
             self.destination.clone(),
             self.latest_manifest.clone(),
+            self.server_status.clone(),
         ));
     }
 }
@@ -115,6 +116,7 @@ impl NetworkOrigin {
                 io_err(e)
             })?
             .into_iter()
+            .filter(|m| m.file_type == "file")
             .map(|m| (m.inode as u64, m.hash as u64))
             .collect();
 
@@ -166,59 +168,9 @@ impl NetworkOrigin {
         }
         *self.latest_manifest.write().unwrap() = current_manifest.clone();
 
-        // 5. Convert manifest entries → Items.
-        let dest = self.destination.clone();
-        let mut snapshot = BTreeMap::new();
-        let root_attrs = FileAttrs {
-            size: 0,
-            blocks: 0,
-            atime: SystemTime::UNIX_EPOCH,
-            mtime: SystemTime::UNIX_EPOCH,
-            ctime: SystemTime::UNIX_EPOCH,
-            crtime: SystemTime::UNIX_EPOCH,
-            perm: 0o755,
-            nlink: 2,
-            uid: 0,
-            gid: 0,
-            rdev: 0,
-            blksize: 4096,
-        };
-        snapshot.insert(
-            INodeNo::ROOT,
-            Item::new(
-                INodeNo::ROOT,
-                INodeNo::ROOT,
-                "/".to_string(),
-                dest.clone(),
-                dest.clone(),
-                FileType::Directory,
-                root_attrs,
-                None,
-            ),
-        );
-
-        let source_root = PathBuf::from("/");
-        for (_id, entry) in &current_manifest {
-            let item = manifest_entry_to_item(entry, &source_root, &mut snapshot);
-            snapshot.insert(item.inode, item);
-        }
-
-        // 6. Reconcile with DB exactly like LocalOrigin: insert/update/delete
-        //    rows, then restore music metadata + virtual paths.
-        let db_items: std::collections::HashMap<i64, item_entities::Model> =
-            item_entities::Entity::find()
-                .all(&self.client)
-                .await
-                .map_err(|e| {
-                    error!(error = %e, "network snapshot: db_items DB read failed");
-                    io_err(e)
-                })?
-                .into_iter()
-                .map(|e| (e.inode, e))
-                .collect();
-        sync_items_to_db(&snapshot, &db_items, &self.client).await;
-        restore_music_metadata_from_db(&mut snapshot, &db_items, &self.client).await;
-        restore_virtual_paths(&mut snapshot, &db_items, &source_root);
+        let snapshot =
+            build_snapshot_from_manifest(&current_manifest, &self.destination, &self.client)
+                .await?;
 
         info!(
             changed = response.changed.len(),
@@ -230,6 +182,70 @@ impl NetworkOrigin {
     }
 }
 
+/// Build a complete Items snapshot from the server manifest, sync it to the
+/// DB, and restore music metadata + virtual paths from existing DB rows.
+///
+/// Shared between `snapshot_async` (initial mount) and the watcher's
+/// `reconcile_once` (runtime updates) so both paths produce identical
+/// snapshots and keep the DB in sync.
+pub(crate) async fn build_snapshot_from_manifest(
+    manifest: &BTreeMap<u64, ProtoManifestEntry>,
+    destination: &Path,
+    client: &sea_orm::DatabaseConnection,
+) -> io::Result<BTreeMap<INodeNo, Item>> {
+    let source_root = PathBuf::from("/");
+    let mut snapshot = BTreeMap::new();
+    let root_attrs = FileAttrs {
+        size: 0,
+        blocks: 0,
+        atime: SystemTime::UNIX_EPOCH,
+        mtime: SystemTime::UNIX_EPOCH,
+        ctime: SystemTime::UNIX_EPOCH,
+        crtime: SystemTime::UNIX_EPOCH,
+        perm: 0o755,
+        nlink: 2,
+        uid: 0,
+        gid: 0,
+        rdev: 0,
+        blksize: 4096,
+    };
+    snapshot.insert(
+        INodeNo::ROOT,
+        Item::new(
+            INodeNo::ROOT,
+            INodeNo::ROOT,
+            "/".to_string(),
+            destination.to_path_buf(),
+            destination.to_path_buf(),
+            FileType::Directory,
+            root_attrs,
+            None,
+        ),
+    );
+
+    for (_id, entry) in manifest {
+        let item = manifest_entry_to_item(entry, &source_root, &mut snapshot);
+        snapshot.insert(item.inode, item);
+    }
+
+    let db_items: std::collections::HashMap<i64, item_entities::Model> =
+        item_entities::Entity::find()
+            .all(client)
+            .await
+            .map_err(|e| {
+                error!(error = %e, "build_snapshot_from_manifest: DB read failed");
+                io_err(e)
+            })?
+            .into_iter()
+            .map(|e| (e.inode, e))
+            .collect();
+    sync_items_to_db(&snapshot, &db_items, client).await;
+    restore_music_metadata_from_db(&mut snapshot, &db_items, client).await;
+    restore_virtual_paths(&mut snapshot, &db_items, &source_root);
+
+    return Ok(snapshot);
+}
+
 fn manifest_entry_to_item(
     entry: &ProtoManifestEntry,
     source_root: &Path,
@@ -251,10 +267,8 @@ fn manifest_entry_to_item(
         rdev: 0,
         blksize: 4096,
     };
-    let music_metadata: Option<MusicMetadata> = entry
-        .music_metadata
-        .clone()
-        .map(|mm| MusicMetadata::from(mm));
+    let music_metadata: Option<MusicMetadata> =
+        entry.music_metadata.clone().map(music_metadata_from_proto);
 
     let mut local_path = PathBuf::new();
     if let Some(mm) = &music_metadata {
@@ -288,26 +302,24 @@ fn manifest_entry_to_item(
     );
 }
 
-impl From<crate::proto::MusicMetadata> for MusicMetadata {
-    fn from(mm: crate::proto::MusicMetadata) -> Self {
-        return MusicMetadata {
-            artist: mm.artist,
-            album_artist: mm.album_artist,
-            album: mm.album,
-            track_number: mm.track_number,
-            track_title: mm.track_title,
-            other_tags: mm.other_tags,
-            header: mm.header,
-            picture_block_headers: mm.picture_block_headers,
-            picture_data_ranges: mm
-                .picture_data_ranges
-                .into_iter()
-                .map(|p| (p.offset, p.length))
-                .collect(),
-            real_audio_start: mm.real_audio_start,
-            vorbis_comment_offset: mm.vorbis_comment_offset,
-            vorbis_comment_length: mm.vorbis_comment_length,
-        };
+fn music_metadata_from_proto(mm: crate::proto::MusicMetadata) -> MusicMetadata {
+    MusicMetadata {
+        artist: mm.artist,
+        album_artist: mm.album_artist,
+        album: mm.album,
+        track_number: mm.track_number,
+        track_title: mm.track_title,
+        other_tags: mm.other_tags,
+        header: mm.header,
+        picture_block_headers: mm.picture_block_headers,
+        picture_data_ranges: mm
+            .picture_data_ranges
+            .into_iter()
+            .map(|p| (p.offset, p.length))
+            .collect(),
+        real_audio_start: mm.real_audio_start,
+        vorbis_comment_offset: mm.vorbis_comment_offset,
+        vorbis_comment_length: mm.vorbis_comment_length,
     }
 }
 

crates/musicfs-client/src/origins/network/transport.rs

@@ -1,4 +1,5 @@
 use std::sync::Arc;
+use std::time::Duration;
 
 use anyhow::{Context, Result, anyhow};
 use tokio_stream::StreamExt;
@@ -28,6 +29,11 @@ impl NetworkTransport {
         let endpoint: tonic::transport::Endpoint = url
             .try_into()
             .map_err(|e| anyhow!("invalid server URL: {e}"))?;
+        let endpoint = endpoint
+            .timeout(Duration::from_secs(3))
+            .connect_timeout(Duration::from_secs(5))
+            .http2_keep_alive_interval(Duration::from_secs(10))
+            .keep_alive_timeout(Duration::from_secs(5));
         let channel = endpoint.connect_lazy();
         let client = Arc::new(tokio::sync::Mutex::new(MusicFsClient::new(channel)));
         return Ok(NetworkTransport { client, endpoint });

crates/musicfs-client/src/origins/network/watcher.rs

@@ -17,7 +17,8 @@ use crate::origins::{FileWatcher, WatcherHandle};
 use crate::proto::ManifestEntry as ProtoManifestEntry;
 use tracing::{info, warn};
 
-const POLL_FALLBACK_INTERVAL: Duration = Duration::from_secs(30);
+const INITIAL_RETRY_DELAY: Duration = Duration::from_secs(1);
+const MAX_RETRY_DELAY: Duration = Duration::from_secs(30);
 
 pub struct NetworkOriginFileWatcher {
     transport: NetworkTransport,
@@ -25,6 +26,7 @@ pub struct NetworkOriginFileWatcher {
     client: DatabaseConnection,
     destination: PathBuf,
     latest_manifest: Arc<RwLock<BTreeMap<u64, ProtoManifestEntry>>>,
+    server_status: crate::health::ServerStatus,
 }
 
 impl NetworkOriginFileWatcher {
@@ -35,6 +37,7 @@ impl NetworkOriginFileWatcher {
         client: DatabaseConnection,
         destination: PathBuf,
         latest_manifest: Arc<RwLock<BTreeMap<u64, ProtoManifestEntry>>>,
+        server_status: crate::health::ServerStatus,
     ) -> Self {
         return NetworkOriginFileWatcher {
             transport,
@@ -42,15 +45,11 @@ impl NetworkOriginFileWatcher {
             client,
             destination,
             latest_manifest,
+            server_status,
         };
     }
 }
 
-/// `files` is currently unused at runtime by the network watcher — the
-/// authoritative post-reconcile snapshot is written to the DB, and the next
-/// FUSE `readdir`/`lookup` will reflect it because FuseFs re-locks the map.
-/// The trait signature still requires it for parity with LocalOriginFileWatcher;
-/// a future refactor can rebuild the map in place here.
 impl FileWatcher for NetworkOriginFileWatcher {
     fn watch(&self, files: Arc<std::sync::Mutex<BTreeMap<INodeNo, Item>>>) -> WatcherHandle {
         let runtime_handle = self.runtime_handle.clone();
@@ -60,6 +59,7 @@ impl FileWatcher for NetworkOriginFileWatcher {
             client: self.client.clone(),
             destination: self.destination.clone(),
             latest_manifest: self.latest_manifest.clone(),
+            server_status: self.server_status.clone(),
             files,
         };
         let loop_shutdown = shutdown.clone();
@@ -73,17 +73,18 @@ impl FileWatcher for NetworkOriginFileWatcher {
     }
 }
 
-#[derive(Clone)]
 struct WatcherState {
     transport: NetworkTransport,
     client: DatabaseConnection,
     destination: PathBuf,
     latest_manifest: Arc<RwLock<BTreeMap<u64, ProtoManifestEntry>>>,
+    server_status: crate::health::ServerStatus,
     files: Arc<std::sync::Mutex<BTreeMap<INodeNo, Item>>>,
 }
 
 impl WatcherState {
     async fn run_loop(self, shutdown: Arc<Notify>) {
+        let mut retry_delay = INITIAL_RETRY_DELAY;
         loop {
             let subscribed = tokio::select! {
                 biased;
@@ -93,6 +94,8 @@ impl WatcherState {
             match subscribed {
                 Ok(mut stream) => {
                     info!("network watcher: subscribed to /events");
+                    self.server_status.set_connected(true);
+                    retry_delay = INITIAL_RETRY_DELAY;
                     loop {
                         let item = tokio::select! {
                             biased;
@@ -107,21 +110,27 @@ impl WatcherState {
                             }
                             Some(Err(e)) => {
                                 warn!(error = %e, "network watcher: stream error; reconnecting");
+                                self.server_status.set_connected(false);
+                                break;
+                            }
+                            None => {
+                                self.server_status.set_connected(false);
                                 break;
                             }
-                            None => break,
                         }
                     }
                 }
                 Err(e) => {
+                    self.server_status.set_connected(false);
                     warn!(error = %e, "network watcher: subscribe failed; will retry");
                 }
             }
             tokio::select! {
                 biased;
                 _ = shutdown.notified() => return,
-                _ = tokio::time::sleep(POLL_FALLBACK_INTERVAL) => {}
+                _ = tokio::time::sleep(retry_delay) => {}
             }
+            retry_delay = (retry_delay * 2).min(MAX_RETRY_DELAY);
             if let Err(e) = self.reconcile_once().await {
                 warn!(error = %e, "network watcher: poll reconcile failed");
             }
@@ -133,6 +142,7 @@ impl WatcherState {
             .all(&self.client)
             .await?
             .into_iter()
+            .filter(|m| m.file_type == "file")
             .map(|m| (m.inode as u64, m.hash as u64))
             .collect();
 
@@ -156,8 +166,31 @@ impl WatcherState {
         }
         *self.latest_manifest.write().unwrap() = current_manifest.clone();
 
-        let _ = self.destination.clone();
-        let _ = self.files.clone();
+        let new_snapshot =
+            super::build_snapshot_from_manifest(&current_manifest, &self.destination, &self.client)
+                .await?;
+
+        {
+            let mut files = self.files.lock().unwrap();
+            files.retain(|ino, _| new_snapshot.contains_key(ino));
+            for (ino, new_item) in &new_snapshot {
+                match files.get(ino) {
+                    Some(existing) if existing.hash == new_item.hash => {}
+                    _ => {
+                        files.insert(*ino, new_item.clone());
+                    }
+                }
+            }
+        }
+
+        self.server_status.mark_reconciled();
+
+        info!(
+            changed = response.changed.len(),
+            deleted = response.deleted.len(),
+            total = current_manifest.len(),
+            "network watcher: reconcile applied"
+        );
 
         return Ok(());
     }

crates/musicfs-client/src/virtual_dirs.rs

@@ -0,0 +1,531 @@
+use std::{
+    collections::BTreeMap,
+    fs,
+    hash::Hasher,
+    path::{Path, PathBuf},
+};
+
+use fuser::INodeNo;
+use twox_hash::XxHash64;
+
+use crate::db::entities::Model;
+use crate::item::{FileType, Item};
+use crate::music::metadata::MusicMetadata;
+use crate::origins::attrs::FileAttrs;
+
+pub fn virtual_inode(path: &str) -> INodeNo {
+    let mut hasher = XxHash64::with_seed(5678);
+    hasher.write(path.as_bytes());
+
+    return INodeNo(hasher.finish() | (1u64 << 63));
+}
+
+pub fn parent_inode_from_path(local_path: &Path) -> INodeNo {
+    let components: Vec<_> = local_path
+        .components()
+        .filter(|c| matches!(c, std::path::Component::Normal(_)))
+        .collect();
+    if components.len() <= 1 {
+        return INodeNo::ROOT;
+    }
+    let mut parent_path = String::new();
+    for (i, comp) in components[..components.len() - 1].iter().enumerate() {
+        if i > 0 {
+            parent_path.push('/');
+        }
+        parent_path.push_str(comp.as_os_str().to_str().unwrap_or_default());
+    }
+
+    return virtual_inode(&parent_path);
+}
+
+pub fn ensure_virtual_dirs(
+    local_path: &Path,
+    source: &Path,
+    map: &mut BTreeMap<INodeNo, Item>,
+) -> INodeNo {
+    let components: Vec<_> = local_path
+        .components()
+        .filter(|c| matches!(c, std::path::Component::Normal(_)))
+        .collect();
+
+    if components.len() <= 1 {
+        return INodeNo::ROOT;
+    }
+
+    let mut current_parent = INodeNo::ROOT;
+    let mut current_path = String::new();
+
+    for component in &components[..components.len() - 1] {
+        let comp_str = component.as_os_str().to_str().unwrap_or_default();
+        if !current_path.is_empty() {
+            current_path.push('/');
+        }
+        current_path.push_str(comp_str);
+
+        let virt_ino = virtual_inode(&current_path);
+
+        if !map.contains_key(&virt_ino) {
+            let virt_item = Item::new(
+                virt_ino,
+                current_parent,
+                comp_str.to_string(),
+                source.to_path_buf(),
+                PathBuf::from(&current_path),
+                FileType::Directory,
+                FileAttrs::from(&fs::metadata(source).unwrap()),
+                None,
+            );
+            map.insert(virt_ino, virt_item);
+        }
+
+        current_parent = virt_ino;
+    }
+
+    return current_parent;
+}
+
+pub fn restore_virtual_paths(
+    snapshot: &mut BTreeMap<INodeNo, Item>,
+    db_items: &std::collections::HashMap<i64, Model>,
+    source: &Path,
+) {
+    let restorations: Vec<(INodeNo, String, PathBuf)> = db_items
+        .values()
+        .filter_map(|db_item| {
+            let ino = INodeNo(db_item.inode as u64);
+            if ino == INodeNo::ROOT {
+                return None;
+            }
+            snapshot
+                .get(&ino)
+                .filter(|item| item.hash as i64 == db_item.hash)
+                .map(|_| {
+                    (
+                        ino,
+                        db_item.name.clone(),
+                        PathBuf::from(&db_item.local_path),
+                    )
+                })
+        })
+        .collect();
+
+    for (_, _, local_path) in &restorations {
+        ensure_virtual_dirs(local_path, source, snapshot);
+    }
+    for (ino, name, local_path) in restorations {
+        if let Some(item) = snapshot.get_mut(&ino) {
+            item.name = name;
+            item.parent_inode = parent_inode_from_path(&local_path);
+            item.local_path = local_path;
+        }
+    }
+}
+
+/// Computes the new (name, local_path) for an Item based on its updated
+/// `MusicMetadata`. Mirrors the layout logic in
+/// `origins::local::snapshot::read_into_map`:
+///   - artist dir = `album_artist` if set, else `artists.join("-")`
+///   - if `track_title` is non-empty, the filename becomes
+///     `{track_number:02} - {track_title}.{ext}` (zero-padded track number
+///     when > 0, otherwise just `{track_title}.{ext}`), ext preserved from
+///     `current_name`
+///   - otherwise the filename is unchanged
+/// Returns `(new_name, new_local_path)`.
+pub fn compute_new_layout(current_name: &str, mm: &MusicMetadata) -> (String, PathBuf) {
+    let artist_dir = artist_dir(mm);
+    let filename = match &mm.track_title {
+        title if !title.is_empty() => {
+            let stem = if mm.track_number > 0 {
+                format!("{:02} - {}", mm.track_number, title)
+            } else {
+                title.clone()
+            };
+            rename_with_extension(current_name, &stem)
+        }
+        _ => current_name.to_string(),
+    };
+
+    let mut local_path = PathBuf::new();
+    local_path.push(&artist_dir);
+    local_path.push(&mm.album);
+    local_path.push(&filename);
+
+    (filename, local_path)
+}
+
+fn artist_dir(mm: &MusicMetadata) -> String {
+    match &mm.album_artist {
+        Some(a) if !a.is_empty() => a.clone(),
+        _ => mm.artist.join("-"),
+    }
+}
+
+fn rename_with_extension(current_name: &str, new_stem: &str) -> String {
+    let current_path = Path::new(current_name);
+    match current_path.extension() {
+        Some(ext) => format!("{new_stem}.{}", ext.to_string_lossy()),
+        None => new_stem.to_string(),
+    }
+}
+
+/// Returns the virtual inodes of directories in the `old_local_path`'s
+/// parent chain that will have no remaining files after this item moves
+/// away. Walks the chain from the deepest directory upward; stops at the
+/// first directory that still has other files living in it.
+///
+/// `moving_inode` is the actual inode of the file being relocated (the
+/// request's `inode`), used to exclude it from the "any other files here?"
+/// check. `old_local_path` is the LOCAL (virtual FUSE) path of the file
+/// before its metadata changed.
+pub fn find_orphaned_dirs(
+    files: &BTreeMap<INodeNo, Item>,
+    moving_inode: INodeNo,
+    old_local_path: &Path,
+) -> Vec<INodeNo> {
+    let components: Vec<_> = old_local_path
+        .components()
+        .filter(|c| matches!(c, std::path::Component::Normal(_)))
+        .collect();
+    if components.len() <= 1 {
+        return vec![];
+    }
+
+    let mut orphaned = vec![];
+    for depth in (1..components.len()).rev() {
+        let dir_path: PathBuf = components[..depth].iter().map(|c| c.as_os_str()).collect();
+        let dir_path_str = dir_path.to_string_lossy().into_owned();
+        let dir_inode = virtual_inode(&dir_path_str);
+
+        // Path-prefix match: a file at "Artist/Album2/b.flac" still keeps
+        // "Artist" non-orphan even though its direct parent is "Artist/Album2".
+        let prefix = format!("{dir_path_str}/");
+        let has_other_files = files.values().any(|item| {
+            item.inode != moving_inode
+                && item.file_type == FileType::File
+                && item.local_path.starts_with(&prefix)
+        });
+        if has_other_files {
+            break;
+        }
+        orphaned.push(dir_inode);
+    }
+    orphaned
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::HashMap;
+
+    // ---- compute_new_layout ----
+
+    fn mm(artist: &str, album: &str, title: &str) -> MusicMetadata {
+        MusicMetadata {
+            artist: vec![artist.to_string()],
+            album_artist: None,
+            album: album.to_string(),
+            track_number: 1,
+            track_title: title.to_string(),
+            other_tags: vec![],
+            header: vec![],
+            picture_block_headers: vec![],
+            picture_data_ranges: vec![],
+            real_audio_start: 0,
+            vorbis_comment_offset: 0,
+            vorbis_comment_length: 0,
+        }
+    }
+
+    fn file_item(inode: u64, name: &str, local_path: &str) -> Item {
+        Item {
+            inode: INodeNo(inode),
+            parent_inode: parent_inode_from_path(Path::new(local_path)),
+            name: name.to_string(),
+            original_path: format!("/torrent/{name}").into(),
+            local_path: local_path.into(),
+            file_type: FileType::File,
+            attrs: FileAttrs {
+                size: 1,
+                blocks: 1,
+                atime: std::time::SystemTime::UNIX_EPOCH,
+                mtime: std::time::SystemTime::UNIX_EPOCH,
+                ctime: std::time::SystemTime::UNIX_EPOCH,
+                crtime: std::time::SystemTime::UNIX_EPOCH,
+                perm: 0o644,
+                nlink: 1,
+                uid: 0,
+                gid: 0,
+                rdev: 0,
+                blksize: 4096,
+            },
+            music_metadata: None,
+            hash: inode,
+        }
+    }
+
+    #[test]
+    fn compute_new_layout_renames_file_when_track_title_provided() {
+        let mm = mm(
+            "Pink Floyd",
+            "Wish You Were Here",
+            "Shine On You Crazy Diamond",
+        );
+        let (name, path) = compute_new_layout("01-track.flac", &mm);
+        assert_eq!(name, "01 - Shine On You Crazy Diamond.flac");
+        assert_eq!(
+            path,
+            PathBuf::from("Pink Floyd/Wish You Were Here/01 - Shine On You Crazy Diamond.flac")
+        );
+    }
+
+    #[test]
+    fn compute_new_layout_preserves_extension_through_rename() {
+        let mm = mm("A", "B", "New Title");
+        let (name, _) = compute_new_layout("old.mp3", &mm);
+        assert_eq!(name, "01 - New Title.mp3");
+    }
+
+    #[test]
+    fn compute_new_layout_handles_multi_dot_extensions() {
+        let mm = mm("A", "B", "New");
+        let (name, _) = compute_new_layout("old.tar.gz", &mm);
+        assert_eq!(name, "01 - New.gz", "only the final extension is preserved");
+    }
+
+    #[test]
+    fn compute_new_layout_keeps_original_name_when_track_title_empty() {
+        let mut metadata = mm("A", "B", "ignored");
+        metadata.track_title = String::new();
+        let (name, path) = compute_new_layout("original-name.flac", &metadata);
+        assert_eq!(name, "original-name.flac");
+        assert_eq!(path, PathBuf::from("A/B/original-name.flac"));
+    }
+
+    #[test]
+    fn compute_new_layout_uses_album_artist_when_present() {
+        let mut metadata = mm("Secondary", "Album", "Title");
+        metadata.album_artist = Some("Primary Artist".to_string());
+        let (_, path) = compute_new_layout("track.flac", &metadata);
+        assert_eq!(path, PathBuf::from("Primary Artist/Album/01 - Title.flac"));
+    }
+
+    #[test]
+    fn compute_new_layout_joins_multiple_artists_with_dash_when_no_album_artist() {
+        let mut metadata = mm("Foo", "Album", "Title");
+        metadata.artist = vec!["Foo".to_string(), "Bar".to_string()];
+        let (_, path) = compute_new_layout("track.flac", &metadata);
+        assert_eq!(path, PathBuf::from("Foo-Bar/Album/01 - Title.flac"));
+    }
+
+    // ---- find_orphaned_dirs ----
+
+    #[test]
+    fn find_orphaned_dirs_returns_both_album_and_artist_when_last_file_moves() {
+        let mut files = BTreeMap::new();
+        files.insert(
+            INodeNo(100),
+            file_item(100, "track.flac", "Artist/Album/track.flac"),
+        );
+
+        let orphaned =
+            find_orphaned_dirs(&files, INodeNo(100), Path::new("Artist/Album/track.flac"));
+        assert_eq!(orphaned.len(), 2);
+        assert!(orphaned.contains(&virtual_inode("Artist/Album")));
+        assert!(orphaned.contains(&virtual_inode("Artist")));
+    }
+
+    #[test]
+    fn find_orphaned_dirs_returns_album_only_when_other_album_keeps_artist() {
+        let mut files = BTreeMap::new();
+        files.insert(
+            INodeNo(100),
+            file_item(100, "a.flac", "Artist/Album1/a.flac"),
+        );
+        files.insert(
+            INodeNo(101),
+            file_item(101, "b.flac", "Artist/Album2/b.flac"),
+        );
+
+        let orphaned = find_orphaned_dirs(&files, INodeNo(100), Path::new("Artist/Album1/a.flac"));
+        assert_eq!(orphaned, vec![virtual_inode("Artist/Album1")]);
+    }
+
+    #[test]
+    fn find_orphaned_dirs_returns_nothing_when_other_files_remain_in_same_album() {
+        let mut files = BTreeMap::new();
+        files.insert(
+            INodeNo(100),
+            file_item(100, "a.flac", "Artist/Album/a.flac"),
+        );
+        files.insert(
+            INodeNo(101),
+            file_item(101, "b.flac", "Artist/Album/b.flac"),
+        );
+
+        let orphaned = find_orphaned_dirs(&files, INodeNo(100), Path::new("Artist/Album/a.flac"));
+        assert!(orphaned.is_empty());
+    }
+
+    #[test]
+    fn find_orphaned_dirs_returns_nothing_for_file_at_root() {
+        let mut files = BTreeMap::new();
+        files.insert(INodeNo(100), file_item(100, "track.flac", "track.flac"));
+
+        let orphaned = find_orphaned_dirs(&files, INodeNo(100), Path::new("track.flac"));
+        assert!(orphaned.is_empty());
+    }
+
+    #[test]
+    fn find_orphaned_dirs_excludes_moving_file_from_other_file_check() {
+        let mut files = BTreeMap::new();
+        files.insert(
+            INodeNo(100),
+            file_item(100, "only.flac", "Artist/Album/only.flac"),
+        );
+        // If we forgot to exclude the moving inode, this test would return
+        // empty (thinking the dir is still populated). Must return both dirs.
+        let orphaned =
+            find_orphaned_dirs(&files, INodeNo(100), Path::new("Artist/Album/only.flac"));
+        assert_eq!(orphaned.len(), 2);
+    }
+
+    #[test]
+    fn virtual_inode_deterministic() {
+        let ino1 = virtual_inode("foo");
+        let ino2 = virtual_inode("foo");
+        assert_eq!(ino1, ino2);
+    }
+
+    #[test]
+    fn virtual_inode_high_bit_set() {
+        let ino = virtual_inode("test");
+        assert_eq!(ino.0 & (1u64 << 63), 1u64 << 63);
+    }
+
+    #[test]
+    fn virtual_inode_different_inputs() {
+        let ino1 = virtual_inode("foo");
+        let ino2 = virtual_inode("bar");
+        assert_ne!(ino1, ino2);
+    }
+
+    #[test]
+    fn parent_inode_single_component() {
+        let ino = parent_inode_from_path(Path::new("file.txt"));
+        assert_eq!(ino, INodeNo::ROOT);
+    }
+
+    #[test]
+    fn parent_inode_multi_component() {
+        let ino = parent_inode_from_path(Path::new("a/b/c"));
+        let expected = virtual_inode("a/b");
+        assert_eq!(ino, expected);
+    }
+
+    #[test]
+    fn parent_inode_absolute_path_filtered() {
+        let ino = parent_inode_from_path(Path::new("/file"));
+        assert_eq!(ino, INodeNo::ROOT);
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_single_component() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        let ino = ensure_virtual_dirs(Path::new("file.txt"), source, &mut map);
+        assert_eq!(ino, INodeNo::ROOT);
+        assert!(map.is_empty());
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_creates_hierarchy() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        let ino = ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+
+        let a_ino = virtual_inode("a");
+        let ab_ino = virtual_inode("a/b");
+
+        assert_eq!(ino, ab_ino);
+        assert_eq!(map.len(), 2);
+        assert!(map.contains_key(&a_ino));
+        assert!(map.contains_key(&ab_ino));
+
+        let a_item = &map[&a_ino];
+        assert_eq!(a_item.parent_inode, INodeNo::ROOT);
+
+        let ab_item = &map[&ab_ino];
+        assert_eq!(ab_item.parent_inode, a_ino);
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_idempotent() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+        let size_after_first = map.len();
+
+        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+        let size_after_second = map.len();
+
+        assert_eq!(size_after_first, size_after_second);
+    }
+
+    #[test]
+    fn restore_virtual_paths_skips_root() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut snapshot = BTreeMap::new();
+
+        let real_ino = INodeNo(42);
+        let real_item = Item::new(
+            real_ino,
+            INodeNo::ROOT,
+            "real_file".to_string(),
+            source.to_path_buf(),
+            PathBuf::from("real_file"),
+            FileType::File,
+            FileAttrs::from(&fs::metadata(source).unwrap()),
+            None,
+        );
+        snapshot.insert(real_ino, real_item);
+
+        let mut db_items = HashMap::new();
+        db_items.insert(
+            1i64,
+            Model {
+                inode: 1,
+                hash: 0,
+                name: "root".to_string(),
+                original_path: "/tmp/test".to_string(),
+                local_path: "/tmp/test".to_string(),
+                file_type: "directory".to_string(),
+            },
+        );
+        db_items.insert(
+            42i64,
+            Model {
+                inode: 42,
+                hash: 0,
+                name: "real_file".to_string(),
+                original_path: "real_file".to_string(),
+                local_path: "real_file".to_string(),
+                file_type: "file".to_string(),
+            },
+        );
+
+        restore_virtual_paths(&mut snapshot, &db_items, source);
+
+        for item in snapshot.values() {
+            assert_ne!(item.name, "/");
+            assert_ne!(item.name, "tmp");
+        }
+    }
+}

crates/musicfs-client/tests/control_test.rs

@@ -0,0 +1,562 @@
+use std::{
+    collections::BTreeMap,
+    sync::{Arc, Mutex},
+    time::SystemTime,
+};
+
+use fuser::INodeNo;
+use musicfs::control::ClientControlServiceImpl;
+use musicfs::db::entities;
+use musicfs::item::{FileType, Item};
+use musicfs::music::db::entities::{artists, music_metadata as mm_entity};
+use musicfs::music::metadata::MusicMetadata;
+use musicfs::origins::attrs::FileAttrs;
+use musicfs_proto::{
+    ClientControl, GetMusicMetadataRequest, ListFilesRequest, UpdateMusicMetadataRequest,
+};
+use sea_orm::{DatabaseBackend, MockDatabase, MockExecResult};
+use tonic::{Code, Request};
+
+// ── Test helpers ───────────────────────────────────────────────────────
+
+fn make_attrs() -> FileAttrs {
+    FileAttrs {
+        size: 4096,
+        blocks: 8,
+        atime: SystemTime::UNIX_EPOCH,
+        mtime: SystemTime::UNIX_EPOCH,
+        ctime: SystemTime::UNIX_EPOCH,
+        crtime: SystemTime::UNIX_EPOCH,
+        perm: 0o644,
+        nlink: 1,
+        uid: 0,
+        gid: 0,
+        rdev: 0,
+        blksize: 4096,
+    }
+}
+
+fn make_flac_item(inode: u64, name: &str, metadata: Option<MusicMetadata>) -> Item {
+    Item {
+        inode: INodeNo(inode),
+        parent_inode: INodeNo(1),
+        name: name.to_string(),
+        original_path: format!("/{name}").into(),
+        local_path: format!("Artist/Album/{name}").into(),
+        file_type: FileType::File,
+        attrs: make_attrs(),
+        music_metadata: metadata,
+        hash: inode,
+    }
+}
+
+fn make_flac_metadata() -> MusicMetadata {
+    MusicMetadata {
+        artist: vec!["Test Artist".to_string()],
+        album_artist: Some("Test Artist".to_string()),
+        album: "Test Album".to_string(),
+        track_number: 1,
+        track_title: "Test Track".to_string(),
+        other_tags: vec![],
+        header: vec![],
+        picture_block_headers: vec![],
+        picture_data_ranges: vec![],
+        real_audio_start: 0,
+        vorbis_comment_offset: 0,
+        vorbis_comment_length: 0,
+    }
+}
+
+/// Mock DB for get tests (no INSERT operations expected).
+fn mock_db_readonly() -> sea_orm::DatabaseConnection {
+    MockDatabase::new(DatabaseBackend::Postgres).into_connection()
+}
+
+/// Mock DB for update with one artist.
+/// save_music_metadata does: DELETE, INSERT music_metadata, INSERT artists.
+/// persist_layout_changes does: UPDATE items (RETURNING), then one DELETE
+/// per orphaned virtual directory (worst case = 2: artist + album dirs).
+fn mock_db_update_with_artist(inode: i64) -> sea_orm::DatabaseConnection {
+    MockDatabase::new(DatabaseBackend::Postgres)
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .append_query_results([vec![mm_entity::Model {
+            inode,
+            track_title: String::new(),
+            album: String::new(),
+            track_number: 0,
+            header: vec![],
+            real_audio_start: 0,
+        }]])
+        .append_query_results([vec![artists::Model {
+            inode,
+            artist: String::new(),
+        }]])
+        .append_query_results([vec![entities::Model {
+            inode,
+            name: String::new(),
+            original_path: String::new(),
+            local_path: String::new(),
+            file_type: "file".to_string(),
+            hash: 0,
+        }]])
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .into_connection()
+}
+
+/// Mock DB for update with no artists.
+/// save_music_metadata does: DELETE, INSERT music_metadata only.
+/// persist_layout_changes does: UPDATE items (RETURNING), then up to two
+/// DELETEs for orphaned virtual directories.
+fn mock_db_update_no_artist(inode: i64) -> sea_orm::DatabaseConnection {
+    MockDatabase::new(DatabaseBackend::Postgres)
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .append_query_results([vec![mm_entity::Model {
+            inode,
+            track_title: String::new(),
+            album: String::new(),
+            track_number: 0,
+            header: vec![],
+            real_audio_start: 0,
+        }]])
+        .append_query_results([vec![entities::Model {
+            inode,
+            name: String::new(),
+            original_path: String::new(),
+            local_path: String::new(),
+            file_type: "file".to_string(),
+            hash: 0,
+        }]])
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .append_exec_results([MockExecResult {
+            rows_affected: 1,
+            ..Default::default()
+        }])
+        .into_connection()
+}
+
+fn make_dir_item(inode: u64, name: &str) -> Item {
+    Item {
+        inode: INodeNo(inode),
+        parent_inode: INodeNo(1),
+        name: name.to_string(),
+        original_path: format!("/{name}").into(),
+        local_path: name.into(),
+        file_type: FileType::Directory,
+        attrs: make_attrs(),
+        music_metadata: None,
+        hash: inode,
+    }
+}
+
+#[tokio::test]
+async fn update_removes_orphaned_virtual_dirs_when_last_file_moves_out() {
+    let source_dir = tempfile::tempdir().unwrap();
+    let source = source_dir.path();
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(0),
+        Item {
+            inode: INodeNo(0),
+            parent_inode: INodeNo::ROOT,
+            name: "/".to_string(),
+            original_path: source.to_path_buf(),
+            local_path: "/".into(),
+            file_type: FileType::Directory,
+            attrs: make_attrs(),
+            music_metadata: None,
+            hash: 0,
+        },
+    );
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "song.flac", Some(make_flac_metadata())),
+    );
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files.clone(), mock_db_update_with_artist(100));
+
+    // Pre-create the virtual dirs for the file's current layout so we can
+    // assert they get pruned after the metadata update moves the file.
+    {
+        use musicfs::virtual_dirs::{ensure_virtual_dirs, virtual_inode};
+        let mut guard = files.lock().unwrap();
+        ensure_virtual_dirs(
+            std::path::Path::new("Artist/Album/song.flac"),
+            source,
+            &mut guard,
+        );
+        assert!(guard.contains_key(&virtual_inode("Artist")));
+        assert!(guard.contains_key(&virtual_inode("Artist/Album")));
+    }
+
+    svc.update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+        inode: 100,
+        artist: vec!["New Artist".to_string()],
+        album_artist: Some("New Artist".to_string()),
+        album: "New Album".to_string(),
+        track_number: 1,
+        track_title: "New Title".to_string(),
+        other_tags: vec![],
+    }))
+    .await
+    .expect("update should succeed");
+
+    let guard = files.lock().unwrap();
+    use musicfs::virtual_dirs::virtual_inode;
+    assert!(
+        !guard.contains_key(&virtual_inode("Artist")),
+        "old Artist dir must be removed when no files remain under it"
+    );
+    assert!(
+        !guard.contains_key(&virtual_inode("Artist/Album")),
+        "old Album dir must be removed"
+    );
+    assert!(guard.contains_key(&virtual_inode("New Artist")));
+    assert!(guard.contains_key(&virtual_inode("New Artist/New Album")));
+
+    let item = guard.get(&INodeNo(100)).expect("file still present");
+    assert_eq!(
+        item.local_path,
+        std::path::PathBuf::from("New Artist/New Album/01 - New Title.flac")
+    );
+}
+
+#[tokio::test]
+async fn update_keeps_shared_artist_dir_when_other_album_remains() {
+    let source_dir = tempfile::tempdir().unwrap();
+    let source = source_dir.path();
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(0),
+        Item {
+            inode: INodeNo(0),
+            parent_inode: INodeNo::ROOT,
+            name: "/".to_string(),
+            original_path: source.to_path_buf(),
+            local_path: "/".into(),
+            file_type: FileType::Directory,
+            attrs: make_attrs(),
+            music_metadata: None,
+            hash: 0,
+        },
+    );
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "a.flac", Some(make_flac_metadata())),
+    );
+    files.insert(
+        INodeNo(101),
+        make_flac_item(101, "b.flac", Some(make_flac_metadata())),
+    );
+    files.get_mut(&INodeNo(101)).unwrap().local_path = "Artist/Other Album/b.flac".into();
+
+    // Pre-create virtual dirs for both files' layouts: pruning after the
+    // update should remove Album/ (file 100's old parent) but keep Artist/
+    // (still has Other Album/ with file 101 in it).
+    {
+        use musicfs::virtual_dirs::ensure_virtual_dirs;
+        ensure_virtual_dirs(
+            std::path::Path::new("Artist/Album/a.flac"),
+            source,
+            &mut files,
+        );
+        ensure_virtual_dirs(
+            std::path::Path::new("Artist/Other Album/b.flac"),
+            source,
+            &mut files,
+        );
+    }
+
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files.clone(), mock_db_update_with_artist(100));
+
+    svc.update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+        inode: 100,
+        artist: vec!["New Artist".to_string()],
+        album_artist: Some("New Artist".to_string()),
+        album: "New Album".to_string(),
+        track_number: 1,
+        track_title: "New Title".to_string(),
+        other_tags: vec![],
+    }))
+    .await
+    .expect("update should succeed");
+
+    let guard = files.lock().unwrap();
+    use musicfs::virtual_dirs::virtual_inode;
+    assert!(
+        guard.contains_key(&virtual_inode("Artist")),
+        "Artist dir must remain while Other Album still has files"
+    );
+    assert!(
+        !guard.contains_key(&virtual_inode("Artist/Album")),
+        "Artist/Album dir must be removed"
+    );
+}
+
+// ── ListFiles ─────────────────────────────────────────────────────────
+
+#[tokio::test]
+async fn list_files_returns_all_files_with_full_field_projection() {
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "a.flac", Some(make_flac_metadata())),
+    );
+    files.insert(INodeNo(101), make_flac_item(101, "b.flac", None));
+    // Directory entries must be filtered out.
+    files.insert(INodeNo(2), make_dir_item(2, "Artist"));
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let resp = svc
+        .list_files(Request::new(ListFilesRequest {}))
+        .await
+        .expect("list should succeed");
+
+    let mut entries = resp.into_inner().files;
+    assert_eq!(entries.len(), 2, "directories must be filtered out");
+    entries.sort_by_key(|e| e.inode);
+
+    assert_eq!(entries[0].inode, 100);
+    assert_eq!(entries[0].name, "a.flac");
+    assert_eq!(entries[0].original_path, "/a.flac");
+    assert_eq!(entries[0].local_path, "Artist/Album/a.flac");
+    assert!(entries[0].metadata.is_some());
+
+    assert_eq!(entries[1].inode, 101);
+    assert_eq!(entries[1].name, "b.flac");
+    assert!(entries[1].metadata.is_none(), "no metadata on this file");
+}
+
+#[tokio::test]
+async fn list_files_empty_map_returns_empty_list() {
+    let files = Arc::new(Mutex::new(BTreeMap::new()));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let resp = svc
+        .list_files(Request::new(ListFilesRequest {}))
+        .await
+        .expect("list should succeed");
+
+    assert!(resp.into_inner().files.is_empty());
+}
+
+#[tokio::test]
+async fn list_files_skips_directories_and_root() {
+    let mut files = BTreeMap::new();
+    files.insert(INodeNo(0), make_dir_item(0, "/")); // root
+    files.insert(INodeNo(1), make_dir_item(1, "Artist"));
+    files.insert(INodeNo(2), make_dir_item(2, "Album"));
+    files.insert(INodeNo(100), make_flac_item(100, "track.flac", None));
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let resp = svc
+        .list_files(Request::new(ListFilesRequest {}))
+        .await
+        .expect("list should succeed");
+
+    let inodes: Vec<u64> = resp
+        .into_inner()
+        .files
+        .into_iter()
+        .map(|e| e.inode)
+        .collect();
+    assert_eq!(inodes, vec![100]);
+}
+
+#[tokio::test]
+async fn get_returns_metadata_for_valid_inode() {
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "song.flac", Some(make_flac_metadata())),
+    );
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let resp = svc
+        .get_music_metadata(Request::new(GetMusicMetadataRequest { inode: 100 }))
+        .await
+        .expect("get should succeed");
+
+    let md = resp.into_inner().metadata.expect("metadata present");
+    assert_eq!(md.track_title, "Test Track");
+    assert_eq!(md.album, "Test Album");
+    assert_eq!(md.artist, vec!["Test Artist".to_string()]);
+    assert_eq!(md.track_number, 1);
+}
+
+#[tokio::test]
+async fn get_returns_not_found_for_missing_inode() {
+    let files = Arc::new(Mutex::new(BTreeMap::new()));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let err = svc
+        .get_music_metadata(Request::new(GetMusicMetadataRequest { inode: 999 }))
+        .await
+        .expect_err("should be NOT_FOUND");
+
+    assert_eq!(err.code(), Code::NotFound);
+}
+
+#[tokio::test]
+async fn get_returns_not_found_when_item_has_no_metadata() {
+    let mut files = BTreeMap::new();
+    files.insert(INodeNo(100), make_flac_item(100, "song.flac", None));
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let err = svc
+        .get_music_metadata(Request::new(GetMusicMetadataRequest { inode: 100 }))
+        .await
+        .expect_err("should be NOT_FOUND");
+
+    assert_eq!(err.code(), Code::NotFound);
+}
+
+// ── UpdateMusicMetadata ───────────────────────────────────────────────
+
+#[tokio::test]
+async fn update_changes_tags_and_response_reflects_new_values() {
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "song.flac", Some(make_flac_metadata())),
+    );
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files.clone(), mock_db_update_with_artist(100));
+
+    let resp = svc
+        .update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+            inode: 100,
+            artist: vec!["Updated Artist".to_string()],
+            album_artist: Some("Updated Artist".to_string()),
+            album: "Updated Album".to_string(),
+            track_number: 7,
+            track_title: "Updated Title".to_string(),
+            other_tags: vec![],
+        }))
+        .await
+        .expect("update should succeed");
+
+    let md = resp.into_inner().metadata.expect("metadata present");
+    assert_eq!(md.track_title, "Updated Title");
+    assert_eq!(md.album, "Updated Album");
+    assert_eq!(md.artist, vec!["Updated Artist".to_string()]);
+    assert_eq!(md.track_number, 7);
+
+    let guard = files.lock().unwrap();
+    let item = guard.get(&INodeNo(100)).expect("item still in map");
+    let mm = item.music_metadata.as_ref().expect("metadata present");
+    assert_eq!(mm.track_title, "Updated Title");
+    assert_eq!(mm.album, "Updated Album");
+    assert_eq!(mm.artist, vec!["Updated Artist".to_string()]);
+    assert_eq!(mm.track_number, 7);
+
+    // Layout was recomputed from the new metadata.
+    assert_eq!(item.name, "07 - Updated Title.flac");
+    assert_eq!(
+        item.local_path,
+        std::path::PathBuf::from("Updated Artist/Updated Album/07 - Updated Title.flac")
+    );
+}
+
+#[tokio::test]
+async fn update_returns_not_found_for_missing_inode() {
+    let files = Arc::new(Mutex::new(BTreeMap::new()));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let err = svc
+        .update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+            inode: 999,
+            artist: vec![],
+            album_artist: None,
+            album: String::new(),
+            track_number: 0,
+            track_title: String::new(),
+            other_tags: vec![],
+        }))
+        .await
+        .expect_err("should be NOT_FOUND");
+
+    assert_eq!(err.code(), Code::NotFound);
+}
+
+#[tokio::test]
+async fn update_returns_not_found_when_item_has_no_metadata() {
+    let mut files = BTreeMap::new();
+    files.insert(INodeNo(100), make_flac_item(100, "song.flac", None));
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files, mock_db_readonly());
+
+    let err = svc
+        .update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+            inode: 100,
+            artist: vec!["X".to_string()],
+            album_artist: None,
+            album: "X".to_string(),
+            track_number: 1,
+            track_title: "X".to_string(),
+            other_tags: vec![],
+        }))
+        .await
+        .expect_err("should be NOT_FOUND");
+
+    assert_eq!(err.code(), Code::NotFound);
+}
+
+#[tokio::test]
+async fn update_clears_tags_when_empty_values_sent() {
+    let mut files = BTreeMap::new();
+    files.insert(
+        INodeNo(100),
+        make_flac_item(100, "song.flac", Some(make_flac_metadata())),
+    );
+    let files = Arc::new(Mutex::new(files));
+    let svc = ClientControlServiceImpl::new(files.clone(), mock_db_update_no_artist(100));
+
+    let resp = svc
+        .update_music_metadata(Request::new(UpdateMusicMetadataRequest {
+            inode: 100,
+            artist: vec![],
+            album_artist: None,
+            album: String::new(),
+            track_number: 0,
+            track_title: String::new(),
+            other_tags: vec![],
+        }))
+        .await
+        .expect("update should succeed");
+
+    let md = resp.into_inner().metadata.expect("metadata present");
+    assert!(md.artist.is_empty());
+    assert!(md.album.is_empty());
+    assert!(md.track_title.is_empty());
+
+    let guard = files.lock().unwrap();
+    let mm = guard
+        .get(&INodeNo(100))
+        .unwrap()
+        .music_metadata
+        .as_ref()
+        .unwrap();
+    assert!(mm.artist.is_empty());
+    assert!(mm.album.is_empty());
+}

crates/musicfs-core/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "musicfs-core"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+symphonia.workspace = true
+twox-hash.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+tracing-appender.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

crates/musicfs-core/src/hash.rs

@@ -0,0 +1,20 @@
+use std::hash::Hasher;
+
+use twox_hash::XxHash64;
+
+pub fn compute_item_hash(
+    inode: u64,
+    original_path: &[u8],
+    ctime_secs: u64,
+    mtime_secs: u64,
+    crtime_secs: u64,
+) -> u64 {
+    let seed = 1234;
+    let mut hasher = XxHash64::with_seed(seed);
+    hasher.write_u64(inode);
+    hasher.write(original_path);
+    hasher.write_u64(ctime_secs);
+    hasher.write_u64(mtime_secs);
+    hasher.write_u64(crtime_secs);
+    hasher.finish()
+}

crates/musicfs-core/src/lib.rs

@@ -0,0 +1,8 @@
+pub mod attrs;
+pub mod hash;
+pub mod logging;
+pub mod music;
+
+pub use attrs::FileAttrs;
+pub use hash::compute_item_hash;
+pub use music::metadata::MusicMetadata;

crates/musicfs-core/src/music/metadata.rs

@@ -0,0 +1,62 @@
+use symphonia::core::meta::{MetadataRevision, StandardTagKey};
+
+#[derive(Debug, Default, Clone, PartialEq, Eq)]
+pub struct MusicMetadata {
+    pub artist: Vec<String>,
+    pub album_artist: Option<String>,
+    pub album: String,
+    pub track_number: i32,
+    pub track_title: String,
+    pub other_tags: Vec<String>,
+    pub header: Vec<u8>,
+    pub picture_block_headers: Vec<Vec<u8>>,
+    pub picture_data_ranges: Vec<(u64, u64)>,
+    pub real_audio_start: u64,
+    pub vorbis_comment_offset: u64,
+    pub vorbis_comment_length: u64,
+}
+
+impl MusicMetadata {
+    pub fn virtual_size(&self, real_file_size: u64) -> u64 {
+        let pictures_size: u64 = self
+            .picture_block_headers
+            .iter()
+            .zip(self.picture_data_ranges.iter())
+            .map(|(prefix, (_, len))| prefix.len() as u64 + len)
+            .sum();
+        self.header.len() as u64 + pictures_size + (real_file_size - self.real_audio_start)
+    }
+}
+
+pub(crate) fn extract_standard_tags(revision: &MetadataRevision, out: &mut MusicMetadata) {
+    for tag in revision.tags() {
+        let value = tag.value.to_string();
+        match tag.std_key {
+            Some(StandardTagKey::Artist) => out.artist.push(value),
+            Some(StandardTagKey::AlbumArtist) => out.album_artist = Some(value),
+            Some(StandardTagKey::Album) => out.album = value,
+            Some(StandardTagKey::TrackNumber) => {
+                out.track_number = value.parse::<i32>().unwrap_or(0)
+            }
+            Some(StandardTagKey::TrackTitle) => out.track_title = value,
+            _ => out.other_tags.push(format!("{}={}", tag.key, value)),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn virtual_size_calculation() {
+        let mut metadata = MusicMetadata::default();
+        metadata.header = vec![0u8; 100];
+        metadata.picture_block_headers = vec![vec![0u8; 4]];
+        metadata.picture_data_ranges = vec![(0, 50)];
+        metadata.real_audio_start = 200;
+        let file_size = 1000u64;
+        let virtual_size = metadata.virtual_size(file_size);
+        assert_eq!(virtual_size, 954);
+    }
+}

crates/musicfs-core/src/music/mod.rs

@@ -1,4 +1,3 @@
-pub mod db;
 pub mod encoder;
 pub mod flac;
 pub mod metadata;

crates/musicfs-proto/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "musicfs-proto"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+prost.workspace = true
+tonic.workspace = true
+tonic-prost.workspace = true

crates/musicfs-proto/src/generated/musicfs/musicfs.rs

@@ -0,0 +1,835 @@
+// @generated
+// This file is @generated by prost-build.
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ReconcileRequest {
+    #[prost(message, repeated, tag = "1")]
+    pub entries: ::prost::alloc::vec::Vec<InodeHash>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ReconcileResponse {
+    #[prost(message, repeated, tag = "1")]
+    pub changed: ::prost::alloc::vec::Vec<InodeHash>,
+    #[prost(uint64, repeated, tag = "2")]
+    pub deleted: ::prost::alloc::vec::Vec<u64>,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct InodeHash {
+    #[prost(uint64, tag = "1")]
+    pub inode: u64,
+    #[prost(uint64, tag = "2")]
+    pub hash: u64,
+}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetMetadataRequest {
+    #[prost(uint64, repeated, tag = "1")]
+    pub inodes: ::prost::alloc::vec::Vec<u64>,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetManifestRequest {}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetFileRequest {
+    #[prost(uint64, tag = "1")]
+    pub id: u64,
+    /// When both are zero the server streams the entire file.
+    #[prost(uint64, tag = "2")]
+    pub start: u64,
+    #[prost(uint64, tag = "3")]
+    pub length: u64,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct SubscribeEventsRequest {}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ManifestEntry {
+    #[prost(uint64, tag = "1")]
+    pub id: u64,
+    #[prost(string, tag = "2")]
+    pub rel_path: ::prost::alloc::string::String,
+    #[prost(uint64, tag = "3")]
+    pub size: u64,
+    #[prost(uint64, tag = "4")]
+    pub mtime: u64,
+    #[prost(uint64, tag = "5")]
+    pub ctime: u64,
+    #[prost(uint64, tag = "6")]
+    pub crtime: u64,
+    #[prost(message, optional, tag = "7")]
+    pub music_metadata: ::core::option::Option<MusicMetadata>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct MusicMetadata {
+    #[prost(string, repeated, tag = "1")]
+    pub artist: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+    #[prost(string, optional, tag = "2")]
+    pub album_artist: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(string, tag = "3")]
+    pub album: ::prost::alloc::string::String,
+    #[prost(int32, tag = "4")]
+    pub track_number: i32,
+    #[prost(string, tag = "5")]
+    pub track_title: ::prost::alloc::string::String,
+    #[prost(string, repeated, tag = "6")]
+    pub other_tags: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+    #[prost(bytes = "vec", tag = "7")]
+    pub header: ::prost::alloc::vec::Vec<u8>,
+    #[prost(bytes = "vec", repeated, tag = "8")]
+    pub picture_block_headers: ::prost::alloc::vec::Vec<::prost::alloc::vec::Vec<u8>>,
+    #[prost(message, repeated, tag = "9")]
+    pub picture_data_ranges: ::prost::alloc::vec::Vec<PictureDataRange>,
+    #[prost(uint64, tag = "10")]
+    pub real_audio_start: u64,
+    #[prost(uint64, tag = "11")]
+    pub vorbis_comment_offset: u64,
+    #[prost(uint64, tag = "12")]
+    pub vorbis_comment_length: u64,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct PictureDataRange {
+    #[prost(uint64, tag = "1")]
+    pub offset: u64,
+    #[prost(uint64, tag = "2")]
+    pub length: u64,
+}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct FileChunk {
+    #[prost(bytes = "vec", tag = "1")]
+    pub data: ::prost::alloc::vec::Vec<u8>,
+    #[prost(uint64, tag = "2")]
+    pub offset: u64,
+    #[prost(uint64, tag = "3")]
+    pub total_size: u64,
+}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct ChangeEvent {
+    /// "create", "modify", or "remove".
+    #[prost(string, tag = "1")]
+    pub kind: ::prost::alloc::string::String,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetClientStatusRequest {}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct ClientStatusResponse {
+    #[prost(string, tag = "1")]
+    pub origin_type: ::prost::alloc::string::String,
+    #[prost(string, tag = "2")]
+    pub mountpoint: ::prost::alloc::string::String,
+    #[prost(uint64, tag = "3")]
+    pub file_count: u64,
+    #[prost(bool, tag = "4")]
+    pub server_connected: bool,
+    #[prost(string, tag = "5")]
+    pub server_endpoint: ::prost::alloc::string::String,
+    #[prost(int64, tag = "6")]
+    pub last_reconcile_unix: i64,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct GetMusicMetadataRequest {
+    #[prost(uint64, tag = "1")]
+    pub inode: u64,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct GetMusicMetadataResponse {
+    #[prost(message, optional, tag = "1")]
+    pub metadata: ::core::option::Option<MusicMetadata>,
+}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct UpdateMusicMetadataRequest {
+    #[prost(uint64, tag = "1")]
+    pub inode: u64,
+    #[prost(string, repeated, tag = "2")]
+    pub artist: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+    #[prost(string, optional, tag = "3")]
+    pub album_artist: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(string, tag = "4")]
+    pub album: ::prost::alloc::string::String,
+    #[prost(int32, tag = "5")]
+    pub track_number: i32,
+    #[prost(string, tag = "6")]
+    pub track_title: ::prost::alloc::string::String,
+    #[prost(string, repeated, tag = "7")]
+    pub other_tags: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct UpdateMusicMetadataResponse {
+    #[prost(message, optional, tag = "1")]
+    pub metadata: ::core::option::Option<MusicMetadata>,
+}
+#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct ListFilesRequest {}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ListFilesResponse {
+    #[prost(message, repeated, tag = "1")]
+    pub files: ::prost::alloc::vec::Vec<FileEntry>,
+}
+/// Human-readable tag fields only. Excludes the binary layout fields
+/// (header, picture_block_headers, etc.) that only make sense inside
+/// musicfs's FUSE read-assembly path.
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct FileMetadata {
+    #[prost(string, repeated, tag = "1")]
+    pub artist: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+    #[prost(string, optional, tag = "2")]
+    pub album_artist: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(string, tag = "3")]
+    pub album: ::prost::alloc::string::String,
+    #[prost(int32, tag = "4")]
+    pub track_number: i32,
+    #[prost(string, tag = "5")]
+    pub track_title: ::prost::alloc::string::String,
+    #[prost(string, repeated, tag = "6")]
+    pub other_tags: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
+}
+#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
+pub struct FileEntry {
+    #[prost(uint64, tag = "1")]
+    pub inode: u64,
+    /// Real on-disk path (where tora/librqbit wrote the file).
+    #[prost(string, tag = "2")]
+    pub original_path: ::prost::alloc::string::String,
+    /// Virtual FUSE path ({artist}/{album}/{filename}); updated when metadata
+    /// changes via `UpdateMusicMetadata`.
+    #[prost(string, tag = "3")]
+    pub local_path: ::prost::alloc::string::String,
+    /// Filename component only.
+    #[prost(string, tag = "4")]
+    pub name: ::prost::alloc::string::String,
+    /// Empty if the file has no parsed tags.
+    #[prost(message, optional, tag = "5")]
+    pub metadata: ::core::option::Option<FileMetadata>,
+}
+/// Encoded file descriptor set for the `musicfs` package
+pub const FILE_DESCRIPTOR_SET: &[u8] = &[
+    0x0a, 0xee, 0x4e, 0x0a, 0x0d, 0x6d, 0x75, 0x73, 0x69, 0x63, 0x66, 0x73, 0x2e, 0x70, 0x72, 0x6f,
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+    0x01, 0x12, 0x04, 0xb1, 0x01, 0x09, 0x0d, 0x0a, 0x0d, 0x0a, 0x05, 0x04, 0x15, 0x02, 0x03, 0x03,
+    0x12, 0x04, 0xb1, 0x01, 0x10, 0x11, 0x0a, 0x0d, 0x0a, 0x05, 0x04, 0x15, 0x02, 0x04, 0x04, 0x12,
+    0x04, 0xb3, 0x01, 0x02, 0x0a, 0x0a, 0x35, 0x0a, 0x04, 0x04, 0x15, 0x02, 0x04, 0x12, 0x04, 0xb3,
+    0x01, 0x02, 0x25, 0x1a, 0x27, 0x20, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x20, 0x69, 0x66, 0x20, 0x74,
+    0x68, 0x65, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x20, 0x68, 0x61, 0x73, 0x20, 0x6e, 0x6f, 0x20, 0x70,
+    0x61, 0x72, 0x73, 0x65, 0x64, 0x20, 0x74, 0x61, 0x67, 0x73, 0x2e, 0x0a, 0x0a, 0x0d, 0x0a, 0x05,
+    0x04, 0x15, 0x02, 0x04, 0x06, 0x12, 0x04, 0xb3, 0x01, 0x0b, 0x17, 0x0a, 0x0d, 0x0a, 0x05, 0x04,
+    0x15, 0x02, 0x04, 0x01, 0x12, 0x04, 0xb3, 0x01, 0x18, 0x20, 0x0a, 0x0d, 0x0a, 0x05, 0x04, 0x15,
+    0x02, 0x04, 0x03, 0x12, 0x04, 0xb3, 0x01, 0x23, 0x24, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+    0x33,
+];
+include!("musicfs.tonic.rs");
+// @@protoc_insertion_point(module)

crates/musicfs-proto/src/lib.rs

@@ -0,0 +1,15 @@
+pub mod musicfs {
+    include!("generated/musicfs/musicfs.rs");
+}
+
+pub use musicfs::{
+    ChangeEvent, ClientStatusResponse, FileChunk, FileEntry, FileMetadata, GetClientStatusRequest,
+    GetFileRequest, GetManifestRequest, GetMetadataRequest, GetMusicMetadataRequest,
+    GetMusicMetadataResponse, InodeHash, ListFilesRequest, ListFilesResponse, ManifestEntry,
+    MusicMetadata, PictureDataRange, ReconcileRequest, ReconcileResponse, SubscribeEventsRequest,
+    UpdateMusicMetadataRequest, UpdateMusicMetadataResponse,
+    client_control_server::{ClientControl, ClientControlServer},
+    client_status_server::{ClientStatus, ClientStatusServer},
+    music_fs_client::MusicFsClient,
+    music_fs_server::{MusicFs, MusicFsServer},
+};

crates/musicfs-server/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "musicfs-server"
+version.workspace = true
+edition.workspace = true
+default-run = "musicfs-server"
+
+[[bin]]
+name = "musicfs-server"
+path = "src/bin/musicfs-server.rs"
+
+[dependencies]
+musicfs-core.workspace = true
+musicfs-proto.workspace = true
+tonic.workspace = true
+tonic-health.workspace = true
+tonic-reflection.workspace = true
+tokio.workspace = true
+anyhow.workspace = true
+async-trait.workspace = true
+clap.workspace = true
+notify.workspace = true
+tokio-stream.workspace = true
+tracing.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true

crates/musicfs-server/src/bin/musicfs-server.rs

@@ -2,8 +2,8 @@ use std::{net::SocketAddr, path::PathBuf};
 
 use anyhow::{Context, Result};
 use clap::Parser;
-use musicfs::logging::{LogConfig, init};
-use musicfs::server::{
+use musicfs_core::logging::{LogConfig, init};
+use musicfs_server::server::{
     state::ServerState,
     transport::{self, TransportArgs},
     watcher::ServerWatcher,

crates/musicfs-server/src/lib.rs

@@ -0,0 +1 @@
+pub mod server;

crates/musicfs-server/src/server/manifest.rs

@@ -1,5 +1,5 @@
-use crate::item::compute_item_hash;
-use crate::music::metadata::MusicMetadata;
+use musicfs_core::compute_item_hash;
+use musicfs_core::music::metadata::MusicMetadata;
 
 /// One row of the in-memory manifest: every field the client needs to
 /// reconstruct an `Item` whose hash matches the server's hash.

crates/musicfs-server/src/server/state.rs

@@ -8,19 +8,19 @@ use std::{
 
 use std::os::unix::fs::MetadataExt;
 
-use crate::music::parse::parse_music_metadata_for_path;
-use crate::origins::attrs::FileAttrs;
 use crate::server::manifest::ManifestEntry;
+use musicfs_core::FileAttrs;
+use musicfs_core::music::parse::parse_music_metadata_for_path;
 use tracing::info;
 
 /// Server-side entry for one file. Built once on startup from a directory
 /// scan and refreshed by the watcher on inotify events.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct FileEntry {
     pub abs_path: PathBuf,
     pub rel_path: String,
     pub attrs: FileAttrs,
-    pub music_metadata: Option<crate::music::metadata::MusicMetadata>,
+    pub music_metadata: Option<musicfs_core::music::metadata::MusicMetadata>,
 }
 
 #[derive(Clone)]
@@ -37,16 +37,17 @@ impl ServerState {
 
     /// Replace the entire map with a fresh scan of `source`. Used on startup
     /// and on watcher-driven reconciliations.
-    pub fn replace_all(&self, source: &Path) -> io::Result<()> {
+    pub fn replace_all(&self, source: &Path) -> io::Result<bool> {
         let entries = scan_directory(source)?;
-        let count = entries.len();
+        let new_map: HashMap<u64, FileEntry> = entries.into_iter().collect();
         let mut map = self.inner.lock().unwrap();
-        map.clear();
-        for (id, entry) in entries {
-            map.insert(id, entry);
+        if *map == new_map {
+            return Ok(false);
         }
-        info!(count, "server state: scan complete");
-        return Ok(());
+        let count = new_map.len();
+        *map = new_map;
+        info!(count, "server state: scan complete (changed)");
+        return Ok(true);
     }
 
     /// Snapshot the current state into a manifest. Order is by inode ascending
@@ -179,4 +180,81 @@ mod tests {
         state.replace_all(source).unwrap();
         assert_eq!(state.manifest().len(), 0);
     }
+
+    #[test]
+    fn replace_all_returns_true_on_first_scan() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("a.txt"), b"x").unwrap();
+
+        let state = ServerState::new();
+        assert!(state.replace_all(source).unwrap());
+    }
+
+    #[test]
+    fn replace_all_returns_false_when_unchanged() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("a.txt"), b"hello").unwrap();
+        fs::write(source.join("b.txt"), b"world").unwrap();
+
+        let state = ServerState::new();
+        state.replace_all(source).unwrap();
+        assert!(!state.replace_all(source).unwrap());
+    }
+
+    #[test]
+    fn replace_all_returns_true_after_file_added() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("a.txt"), b"x").unwrap();
+
+        let state = ServerState::new();
+        state.replace_all(source).unwrap();
+
+        fs::write(source.join("b.txt"), b"y").unwrap();
+        assert!(state.replace_all(source).unwrap());
+    }
+
+    #[test]
+    fn replace_all_returns_true_after_file_removed() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("a.txt"), b"x").unwrap();
+        fs::write(source.join("b.txt"), b"y").unwrap();
+
+        let state = ServerState::new();
+        state.replace_all(source).unwrap();
+
+        fs::remove_file(source.join("a.txt")).unwrap();
+        assert!(state.replace_all(source).unwrap());
+    }
+
+    #[test]
+    fn replace_all_returns_true_after_file_renamed() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("old.txt"), b"x").unwrap();
+
+        let state = ServerState::new();
+        state.replace_all(source).unwrap();
+        assert!(!state.replace_all(source).unwrap());
+
+        fs::rename(source.join("old.txt"), source.join("new.txt")).unwrap();
+        assert!(state.replace_all(source).unwrap());
+    }
+
+    #[test]
+    fn replace_all_returns_true_after_content_modified() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        fs::write(source.join("a.txt"), b"original").unwrap();
+
+        let state = ServerState::new();
+        state.replace_all(source).unwrap();
+        assert!(!state.replace_all(source).unwrap());
+
+        fs::write(source.join("a.txt"), b"modified content").unwrap();
+        assert!(state.replace_all(source).unwrap());
+    }
 }

crates/musicfs-server/src/server/transport/grpc.rs

@@ -10,19 +10,19 @@ use async_trait::async_trait;
 use tokio::sync::broadcast::Receiver;
 use tonic::{Request, Response, Status, transport::Server};
 
-use crate::music::metadata::MusicMetadata;
-use crate::proto as proto_types;
-use crate::proto::MusicFs as MusicFsTrait;
-use crate::proto::{
+use crate::server::manifest::ManifestEntry as DomainManifestEntry;
+use crate::server::state::ServerState;
+use crate::server::transport::{MusicTransport, TransportArgs};
+use crate::server::watcher::{ChangeEvent, ChangeKind};
+use musicfs_core::music::metadata::MusicMetadata;
+use musicfs_proto as proto_types;
+use musicfs_proto::MusicFs as MusicFsTrait;
+use musicfs_proto::{
     ChangeEvent as ProtoChangeEvent, FileChunk, GetFileRequest, GetManifestRequest,
     GetMetadataRequest, InodeHash, ManifestEntry, MusicFsServer,
     MusicMetadata as ProtoMusicMetadata, PictureDataRange, ReconcileRequest, ReconcileResponse,
     SubscribeEventsRequest,
 };
-use crate::server::manifest::ManifestEntry as DomainManifestEntry;
-use crate::server::state::ServerState;
-use crate::server::transport::{MusicTransport, TransportArgs};
-use crate::server::watcher::{ChangeEvent, ChangeKind};
 use tracing::{debug, info, warn};
 
 pub struct GrpcTransport {
@@ -53,11 +53,11 @@ impl MusicTransport for GrpcTransport {
 
         // v1alpha covers older clients; v1 is the current standard.
         let reflection_v1 = tonic_reflection::server::Builder::configure()
-            .register_encoded_file_descriptor_set(crate::proto::musicfs::FILE_DESCRIPTOR_SET)
+            .register_encoded_file_descriptor_set(musicfs_proto::musicfs::FILE_DESCRIPTOR_SET)
             .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
             .build_v1()?;
         let reflection_v1alpha = tonic_reflection::server::Builder::configure()
-            .register_encoded_file_descriptor_set(crate::proto::musicfs::FILE_DESCRIPTOR_SET)
+            .register_encoded_file_descriptor_set(musicfs_proto::musicfs::FILE_DESCRIPTOR_SET)
             .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
             .build_v1alpha()?;
 
@@ -298,31 +298,29 @@ impl From<DomainManifestEntry> for ManifestEntry {
             mtime: entry.mtime,
             ctime: entry.ctime,
             crtime: entry.crtime,
-            music_metadata: entry.music_metadata.map(Into::into),
+            music_metadata: entry.music_metadata.map(music_metadata_to_proto),
         };
     }
 }
 
-impl From<MusicMetadata> for ProtoMusicMetadata {
-    fn from(mm: MusicMetadata) -> Self {
-        return ProtoMusicMetadata {
-            artist: mm.artist,
-            album_artist: mm.album_artist,
-            album: mm.album,
-            track_number: mm.track_number,
-            track_title: mm.track_title,
-            other_tags: mm.other_tags,
-            header: mm.header,
-            picture_block_headers: mm.picture_block_headers,
-            picture_data_ranges: mm
-                .picture_data_ranges
-                .into_iter()
-                .map(|(offset, length)| PictureDataRange { offset, length })
-                .collect(),
-            real_audio_start: mm.real_audio_start,
-            vorbis_comment_offset: mm.vorbis_comment_offset,
-            vorbis_comment_length: mm.vorbis_comment_length,
-        };
+fn music_metadata_to_proto(mm: MusicMetadata) -> ProtoMusicMetadata {
+    ProtoMusicMetadata {
+        artist: mm.artist,
+        album_artist: mm.album_artist,
+        album: mm.album,
+        track_number: mm.track_number,
+        track_title: mm.track_title,
+        other_tags: mm.other_tags,
+        header: mm.header,
+        picture_block_headers: mm.picture_block_headers,
+        picture_data_ranges: mm
+            .picture_data_ranges
+            .into_iter()
+            .map(|(offset, length)| PictureDataRange { offset, length })
+            .collect(),
+        real_audio_start: mm.real_audio_start,
+        vorbis_comment_offset: mm.vorbis_comment_offset,
+        vorbis_comment_length: mm.vorbis_comment_length,
     }
 }
 

crates/musicfs-server/src/server/watcher.rs

@@ -2,6 +2,7 @@ use std::{
     path::PathBuf,
     sync::{Arc, Mutex},
     thread,
+    time::Duration,
 };
 
 use notify::{EventKind, RecursiveMode, Watcher};
@@ -10,6 +11,8 @@ use tokio::sync::broadcast;
 use crate::server::state::ServerState;
 use tracing::{error, info};
 
+const POLL_INTERVAL: Duration = Duration::from_secs(15);
+
 /// A change observed by the watcher. Pushed onto the broadcast channel for
 /// `/events` subscribers. The client treats these as wake-ups: correctness
 /// always rests on the subsequent `/manifest` hash diff.
@@ -76,25 +79,41 @@ fn run_watcher_loop(
     }
 
     info!(source = %source.display(), "server watcher: scanning for changes");
-    for res in rx {
-        match res {
-            Ok(event) => match event.kind {
-                EventKind::Create(_) | EventKind::Modify(_) | EventKind::Remove(_) => {
-                    let kind = match event.kind {
-                        EventKind::Create(_) => ChangeKind::Create,
-                        EventKind::Modify(_) => ChangeKind::Modify,
-                        EventKind::Remove(_) => ChangeKind::Remove,
-                        _ => continue,
-                    };
-                    if let Err(e) = state.replace_all(&source) {
-                        error!(error = %e, "server watcher: state refresh failed");
-                        continue;
+    loop {
+        match rx.recv_timeout(POLL_INTERVAL) {
+            Ok(res) => match res {
+                Ok(event) => match event.kind {
+                    EventKind::Create(_) | EventKind::Modify(_) | EventKind::Remove(_) => {
+                        let kind = match event.kind {
+                            EventKind::Create(_) => ChangeKind::Create,
+                            EventKind::Modify(_) => ChangeKind::Modify,
+                            EventKind::Remove(_) => ChangeKind::Remove,
+                            _ => continue,
+                        };
+                        match state.replace_all(&source) {
+                            Ok(true) => {
+                                let _ = events_tx.send(ChangeEvent { kind });
+                            }
+                            Ok(false) => {}
+                            Err(e) => {
+                                error!(error = %e, "server watcher: state refresh failed");
+                            }
+                        }
                     }
-                    let _ = events_tx.send(ChangeEvent { kind });
-                }
-                _ => {}
+                    _ => {}
+                },
+                Err(e) => error!(error = %e, "server watcher: inotify error"),
             },
-            Err(e) => error!(error = %e, "server watcher: inotify error"),
+            Err(std::sync::mpsc::RecvTimeoutError::Timeout) => match state.replace_all(&source) {
+                Ok(true) => {
+                    let _ = events_tx.send(ChangeEvent {
+                        kind: ChangeKind::Modify,
+                    });
+                }
+                Ok(false) => {}
+                Err(e) => error!(error = %e, "server watcher: poll rescan failed"),
+            },
+            Err(std::sync::mpsc::RecvTimeoutError::Disconnected) => break,
         }
     }
 }

devenv.nix

@@ -6,6 +6,33 @@
   ...
 }:
 
+let
+  # devenv's `languages.rust.import` only builds single root-package crates
+  # (it hardcodes `cargoNix.rootCrate.build`). musicfs is a virtual workspace with
+  # no root package, so we drive crate2nix directly and select the `musicfs-client`
+  # member out of `workspaceMembers`. src = ./. gives crate2nix the whole workspace,
+  # so the member's path-dependencies (musicfs-core, musicfs-proto) resolve.
+  crate2nixTools = pkgs.callPackage "${inputs.crate2nix}/tools.nix" { };
+  cargoNix =
+    pkgs.callPackage
+      (crate2nixTools.generatedCargoNix {
+        name = "musicfs";
+        src = ./.;
+      })
+      {
+        # Build with the toolchain configured for this dev environment,
+        # matching what languages.rust.import does internally.
+        buildRustCrateForPkgs =
+          _:
+          pkgs.buildRustCrate.override {
+            rustc = config.languages.rust.toolchainPackage;
+            cargo = config.languages.rust.toolchainPackage;
+          };
+      };
+
+  # musicfs-client's binary is named `musicfs` (see [[bin]] in its Cargo.toml).
+  musicfs = cargoNix.workspaceMembers."musicfs-client".build;
+in
 {
   languages.rust.enable = true;
   git-hooks.hooks = {
@@ -42,18 +69,24 @@
   processes.musicfs = {
     after = [ "devenv:processes:postgres" ];
     exec = lib.mkDefault ''
-      cargo run -- \
+      ${musicfs}/bin/musicfs \
         --source /home/fujin/Music \
         --mountpoint /tmp/rust-fuse \
         --database "postgresql://fujin@localhost/musicfs?host=$PGHOST"
     '';
+    # Probes the standard gRPC Health Checking Protocol exposed on the
+    # musicfs-client status server (default --listen 127.0.0.1:50052).
+    # SERVING implies the FUSE mount succeeded and, for NetworkOrigin, the
+    # upstream musicfs-server is reachable (health.rs toggles not_serving on
+    # upstream loss). Inherited by profiles.* since they only override `exec`.
+    ready.exec = "grpcurl -plaintext -max-time 2 127.0.0.1:50052 grpc.health.v1.Health/Check | grep -q SERVING";
   };
 
   profiles.local.module = {
     processes.musicfs = {
       after = [ "devenv:processes:postgres" ];
       exec = ''
-        cargo run -- \
+        ${musicfs}/bin/musicfs \
           --source /home/fujin/Music \
           --mountpoint /tmp/rust-fuse \
           --database "postgresql://fujin@localhost/musicfs?host=$PGHOST"
@@ -65,7 +98,7 @@
     processes.musicfs = {
       after = [ "devenv:processes:postgres" ];
       exec = ''
-        cargo run -- \
+        ${musicfs}/bin/musicfs \
           --source http://10.185.226.145:50051 \
           --mountpoint /tmp/rust-fuse \
           --database "postgresql://fujin@localhost/musicfs?host=$PGHOST"
@@ -77,7 +110,7 @@
     processes.musicfs = {
       after = [ "devenv:processes:postgres" ];
       exec = ''
-        cargo run -- \
+        ${musicfs}/bin/musicfs \
           --source http://127.0.0.1:50061 \
           --mountpoint ./target/e2e/mnt \
           --database "postgresql://fujin@localhost/musicfs_e2e?host=$PGHOST" \
@@ -101,6 +134,6 @@
   };
 
   outputs = {
-    rust-app = config.languages.rust.import ./. { };
+    musicfs = musicfs;
   };
 }

justfile

@@ -6,5 +6,14 @@ build:
 up profile:
     devenv up --profile {{profile}}
 
+vm command:
+    scripts/vm.sh {{command}}
+    
+redeploy:
+    scripts/vm.sh redeploy
+
 e2e:
-    scripts/e2e/run.sh    
+    scripts/e2e/run.sh
+
+e2e-resilience:
+    scripts/e2e/run-resilience.sh    

proto/buf.gen.yaml

@@ -1,8 +1,8 @@
 version: v2
 plugins:
   - remote: buf.build/community/neoeinstein-prost
-    out: ../src/proto/generated
+    out: ../crates/musicfs-proto/src/generated
     opt:
       - file_descriptor_set
   - remote: buf.build/community/neoeinstein-tonic
-    out: ../src/proto/generated
+    out: ../crates/musicfs-proto/src/generated

proto/musicfs.proto

@@ -32,6 +32,20 @@ service MusicFs {
   rpc SubscribeEvents(SubscribeEventsRequest) returns (stream ChangeEvent);
 }
 
+// Client-side status reporting (served by the FUSE client process).
+service ClientStatus {
+  rpc GetClientStatus(GetClientStatusRequest) returns (ClientStatusResponse);
+}
+
+service ClientControl {
+  rpc GetMusicMetadata(GetMusicMetadataRequest) returns (GetMusicMetadataResponse);
+  rpc UpdateMusicMetadata(UpdateMusicMetadataRequest) returns (UpdateMusicMetadataResponse);
+  // Every file musicfs knows about. Caller filters by `original_path`
+  // prefix to find the files of interest (e.g. all files under a single
+  // torrent's output directory).
+  rpc ListFiles(ListFilesRequest) returns (ListFilesResponse);
+}
+
 message ReconcileRequest {
   repeated InodeHash entries = 1;
 }
@@ -101,3 +115,67 @@ message ChangeEvent {
   // "create", "modify", or "remove".
   string kind = 1;
 }
+
+message GetClientStatusRequest {}
+
+message ClientStatusResponse {
+  string origin_type = 1;
+  string mountpoint = 2;
+  uint64 file_count = 3;
+  bool server_connected = 4;
+  string server_endpoint = 5;
+  int64 last_reconcile_unix = 6;
+}
+
+message GetMusicMetadataRequest {
+  uint64 inode = 1;
+}
+
+message GetMusicMetadataResponse {
+  MusicMetadata metadata = 1;
+}
+
+message UpdateMusicMetadataRequest {
+  uint64 inode = 1;
+  repeated string artist = 2;
+  optional string album_artist = 3;
+  string album = 4;
+  int32 track_number = 5;
+  string track_title = 6;
+  repeated string other_tags = 7;
+}
+
+message UpdateMusicMetadataResponse {
+  MusicMetadata metadata = 1;
+}
+
+message ListFilesRequest {}
+
+message ListFilesResponse {
+  repeated FileEntry files = 1;
+}
+
+// Human-readable tag fields only. Excludes the binary layout fields
+// (header, picture_block_headers, etc.) that only make sense inside
+// musicfs's FUSE read-assembly path.
+message FileMetadata {
+  repeated string artist = 1;
+  optional string album_artist = 2;
+  string album = 3;
+  int32 track_number = 4;
+  string track_title = 5;
+  repeated string other_tags = 6;
+}
+
+message FileEntry {
+  uint64 inode = 1;
+  // Real on-disk path (where tora/librqbit wrote the file).
+  string original_path = 2;
+  // Virtual FUSE path ({artist}/{album}/{filename}); updated when metadata
+  // changes via `UpdateMusicMetadata`.
+  string local_path = 3;
+  // Filename component only.
+  string name = 4;
+  // Empty if the file has no parsed tags.
+  optional FileMetadata metadata = 5;
+}

scripts/e2e/README.md

@@ -14,10 +14,13 @@ against the mountpoint.
 ```sh
 just e2e              # full suite (creates VM, runs tests, destroys VM)
 KEEP=1 just e2e       # keep VM + DB alive after run for debugging
+just e2e-resilience   # resilience suite (server stop/start, network partition, outage recovery)
 ```
 
 ## What it tests
 
+### Functional suite (`just e2e`)
+
 | Phase        | Description                                              |
 | ------------ | ------------------------------------------------------- |
 | structural   | Virtual directory tree matches fixture tags             |
@@ -29,6 +32,15 @@ KEEP=1 just e2e       # keep VM + DB alive after run for debugging
 | chunked write| Non-metadata writes don't corrupt tag structure         |
 | persistence  | Tags survive client restart (DB restore path)            |
 
+### Resilience suite (`just e2e-resilience`)
+
+| Scenario          | Disruption                          | What it verifies                                         |
+| ----------------- | ----------------------------------- | -------------------------------------------------------- |
+| server stop/start | `systemctl stop/start` in VM        | EIO on uncached reads, cached reads survive, watcher resubscribes within 10s |
+| network partition | `incus pause/start` (silent drop)   | EIO within 10s (tonic 3s timeout × kernel readahead), watcher detects via HTTP/2 keepalive within 30s |
+| cache resilience  | server stop, all files pre-cached   | All reads/writes from cache, no server contact needed    |
+| long outage       | `incus pause` for 15s+              | Watcher detects via keepalive PING, resubscribes within 10s of recovery |
+
 ## Fixtures
 
 `make-fixtures.sh` generates a deterministic library under `target/e2e/music/`:

scripts/e2e/resilience-helpers.sh

@@ -0,0 +1,309 @@
+#!/usr/bin/env bash
+#
+# resilience-helpers.sh — disruption primitives and FUSE/log assertions for
+# network stability and reconnection E2E tests.
+#
+# Requires lib.sh globals ($FAILURES, $PASSES, $FAILED_TESTS) and config
+# variables from run-resilience.sh ($VM_NAME, $PORT, $VM_IP, $MNT, $LOG_DIR,
+# $DB_NAME, $PGHOST, $CLIENT_PID, $ALPHA, $BETA, $GAMMA, $DELTA).
+#
+# Sourced by run-resilience.sh — do NOT execute directly.
+
+# ── timeouts (seconds) ──
+HEALTH_TIMEOUT=45
+READ_TIMEOUT=15
+READ_FAIL_TIMEOUT=10
+RECOVER_TIMEOUT=30
+VM_RESUME_TIMEOUT=30
+
+# ── internal pass/fail (reuses lib.sh globals) ──
+_res_pass() {
+  printf '  \033[1;32mPASS\033[0m %s\n' "$1"
+  ((++PASSES))
+}
+
+_res_fail() {
+  printf '  \033[1;31mFAIL\033[0m %s\n' "$1"
+  ((++FAILURES))
+  FAILED_TESTS+="$1; "
+}
+
+# ── client liveness ──
+check_client_alive() {
+  if [[ -n "$CLIENT_PID" ]] && ! kill -0 "$CLIENT_PID" 2>/dev/null; then
+    printf '\033[1;31m[e2e error]\033[0m client process died — check %s\n' "$LOG_DIR" >&2
+    return 1
+  fi
+  return 0
+}
+
+# ── disruption primitives ──
+server_stop() {
+  log "stopping server in VM…"
+  incus exec "$VM_NAME" -- systemctl stop musicfs-server.service 2>/dev/null || true
+}
+
+server_start() {
+  log "starting server in VM…"
+  incus exec "$VM_NAME" -- systemctl start musicfs-server.service 2>/dev/null || true
+}
+
+vm_pause() {
+  log "pausing VM '$VM_NAME'…"
+  incus pause "$VM_NAME"
+}
+
+vm_resume() {
+  log "resuming VM '$VM_NAME'…"
+  incus start "$VM_NAME"
+  local i
+  for ((i = 0; i < VM_RESUME_TIMEOUT; i++)); do
+    if incus exec "$VM_NAME" -- true 2>/dev/null; then return 0; fi
+    sleep 1
+  done
+  die "VM did not become reachable after resume"
+}
+
+# ── health check helpers ──
+wait_health() {
+  local timeout="${1:-$HEALTH_TIMEOUT}"
+  local i
+  for ((i = 0; i < timeout; i++)); do
+    if timeout 5 grpcurl -plaintext "$VM_IP:$PORT" grpc.health.v1.Health/Check 2>/dev/null | grep -q SERVING; then
+      return 0
+    fi
+    sleep 1
+  done
+  return 1
+}
+
+assert_health_down() {
+  local desc="$1"
+  if timeout 5 grpcurl -plaintext "$VM_IP:$PORT" grpc.health.v1.Health/Check 2>/dev/null | grep -q SERVING; then
+    _res_fail "$desc (server still serving)"
+  else
+    _res_pass "$desc"
+  fi
+}
+
+assert_health_up() {
+  local desc="$1"
+  if wait_health "$HEALTH_TIMEOUT"; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (health check timed out)"
+  fi
+}
+
+# ── cache control ──
+clear_cache() {
+  log "clearing Postgres byte cache…"
+  psql -q -d "$DB_NAME" -c "DELETE FROM cached_file_bytes;" 2>/dev/null || true
+}
+
+# ── prewarm ──
+prewarm_file() {
+  local file="$1"
+  timeout "$READ_TIMEOUT" dd if="$file" of=/dev/null bs=4096 2>/dev/null || true
+}
+
+prewarm_all() {
+  log "prewarming cache (reading all test files)…"
+  prewarm_file "$ALPHA"
+  prewarm_file "$BETA"
+  prewarm_file "$GAMMA"
+  prewarm_file "$DELTA"
+}
+
+# ── FUSE read assertions ──
+assert_fuse_read_ok() {
+  local desc="$1" file="$2"
+  check_client_alive || return 1
+  if timeout "$READ_TIMEOUT" dd if="$file" of=/dev/null bs=4096 2>/dev/null; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (read failed or timed out after ${READ_TIMEOUT}s)"
+  fi
+}
+
+# Assert a FUSE read fails with EIO *before* max_seconds.
+# Distinguishes "fast EIO" (system returned an error) from "indefinite hang"
+# (timeout killed dd). Currently FAILS during silent partitions because
+# there's no tonic timeout configured — the RPC hangs until the OS gives up.
+assert_fuse_eio_within() {
+  local desc="$1" file="$2" max_seconds="${3:-$READ_FAIL_TIMEOUT}"
+  check_client_alive || return 1
+  local start; start=$(date +%s)
+  local rc=0
+  timeout "$max_seconds" dd if="$file" of=/dev/null bs=4096 2>/dev/null || rc=$?
+  local end; end=$(date +%s)
+  local elapsed=$((end - start))
+  if (( rc == 0 )); then
+    _res_fail "$desc (read succeeded unexpectedly in ${elapsed}s)"
+  elif (( elapsed >= max_seconds )); then
+    _res_fail "$desc (hung ${elapsed}s — no EIO returned; missing tonic timeout)"
+  else
+    _res_pass "$desc (EIO in ${elapsed}s)"
+  fi
+}
+
+assert_fuse_metaflac_ok() {
+  local desc="$1" file="$2"
+  check_client_alive || return 1
+  if timeout "$READ_TIMEOUT" metaflac --show-tag=TITLE "$file" >/dev/null 2>&1; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (metaflac read failed)"
+  fi
+}
+
+assert_fuse_id3v2_ok() {
+  local desc="$1" file="$2"
+  check_client_alive || return 1
+  if timeout "$READ_TIMEOUT" id3v2 --list "$file" >/dev/null 2>&1; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (id3v2 read failed)"
+  fi
+}
+
+assert_fuse_ffprobe_ok() {
+  local desc="$1" file="$2"
+  check_client_alive || return 1
+  if timeout "$READ_TIMEOUT" ffprobe -hide_banner -v quiet -show_format "$file" >/dev/null 2>&1; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (ffprobe failed)"
+  fi
+}
+
+# ── FUSE directory assertion ──
+assert_dir_listing() {
+  local desc="$1" dir="$2" expected="$3"
+  check_client_alive || return 1
+  local result; result="$(timeout "$READ_TIMEOUT" ls "$dir" 2>/dev/null || true)"
+  if [[ "$result" == *"$expected"* ]]; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (directory missing '$expected')"
+  fi
+}
+
+# ── FUSE write assertions ──
+assert_metaflac_write_readback() {
+  local desc="$1" file="$2" tag="$3" value="$4"
+  check_client_alive || return 1
+  metaflac --remove-tag="$tag" --set-tag="$tag=$value" "$file" 2>/dev/null
+  local result; result="$(metaflac --show-tag="$tag" "$file" 2>/dev/null || true)"
+  if [[ "$result" == *"$value"* ]]; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (write readback mismatch)"
+  fi
+}
+
+assert_mp3_write_readback() {
+  local desc="$1" file="$2" song="$3"
+  check_client_alive || return 1
+  id3v2 --song "$song" "$file" 2>/dev/null
+  local result; result="$(id3v2 --list "$file" 2>/dev/null || true)"
+  if [[ "$result" == *"$song"* ]]; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (MP3 write readback mismatch)"
+  fi
+}
+
+# ── log assertions ──
+_get_log_file() {
+  ls -t "$LOG_DIR"/musicfs.*.log 2>/dev/null | head -1
+}
+
+assert_log_contains() {
+  local desc="$1" pattern="$2"
+  local log_file; log_file="$(_get_log_file)"
+  if [[ -n "$log_file" ]] && grep -q "$pattern" "$log_file" 2>/dev/null; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (pattern '$pattern' not in logs)"
+  fi
+}
+
+log_contains_since() {
+  local pattern="$1" from_line="$2"
+  local log_file; log_file="$(_get_log_file)"
+  [[ -n "$log_file" ]] && tail -n +"$((from_line + 1))" "$log_file" 2>/dev/null | grep -q "$pattern"
+}
+
+log_line_count() {
+  local log_file; log_file="$(_get_log_file)"
+  if [[ -n "$log_file" ]]; then
+    wc -l < "$log_file" 2>/dev/null || echo 0
+  else
+    echo 0
+  fi
+}
+
+assert_log_contains_after() {
+  local desc="$1" pattern="$2" marker="$3"
+  local log_file; log_file="$(_get_log_file)"
+  if [[ -z "$log_file" ]]; then
+    _res_fail "$desc (no log file)"
+    return
+  fi
+  # Find line number of the last occurrence of the marker.
+  local marker_line
+  marker_line="$(grep -n "$marker" "$log_file" 2>/dev/null | tail -1 | cut -d: -f1)"
+  if [[ -z "$marker_line" ]]; then
+    _res_fail "$desc (marker '$marker' not in log)"
+    return
+  fi
+  if tail -n +"$((marker_line + 1))" "$log_file" 2>/dev/null | grep -q "$pattern"; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc ('$pattern' not found after marker line $marker_line)"
+  fi
+}
+
+# ── recovery wait ──
+wait_recover() {
+  local file="$1"
+  local timeout="${2:-$RECOVER_TIMEOUT}"
+  local i
+  for ((i = 0; i < timeout; i++)); do
+    check_client_alive || return 1
+    if timeout 5 dd if="$file" of=/dev/null bs=4096 2>/dev/null; then
+      return 0
+    fi
+    sleep 1
+  done
+  return 1
+}
+
+assert_recovered() {
+  local desc="$1" file="$2"
+  if wait_recover "$file"; then
+    _res_pass "$desc"
+  else
+    _res_fail "$desc (did not recover within ${RECOVER_TIMEOUT}s)"
+  fi
+}
+
+# ── scenario isolation ──
+ensure_clean_state() {
+  log "ensuring clean state between scenarios…"
+  # Server must be up
+  if ! wait_health 5 2>/dev/null; then
+    server_start
+    wait_health "$HEALTH_TIMEOUT" || die "server won't come up between scenarios"
+  fi
+  # VM must be running (not paused)
+  local state
+  state="$(incus list "$VM_NAME" -f csv -c s 2>/dev/null | head -1)"
+  if [[ "$state" == "FROZEN" ]]; then
+    vm_resume
+    wait_health "$HEALTH_TIMEOUT" || die "server unhealthy after VM resume"
+  fi
+  check_client_alive || die "client died between scenarios"
+  clear_cache
+}

scripts/e2e/run-resilience.sh

@@ -0,0 +1,433 @@
+#!/usr/bin/env bash
+#
+# run-resilience.sh — network stability and reconnection E2E suite for musicfs.
+#
+# Tests client behavior during server outages, network partitions (VM pause),
+# cache resilience, and long-outage watcher recovery.
+#
+# Requires: devenv shell (for ffmpeg, metaflac, id3v2, incus, grpcurl, Postgres)
+#
+# Usage:
+#   scripts/e2e/run-resilience.sh          full suite
+#   KEEP=1 scripts/e2e/run-resilience.sh   keep VM + DB alive for debugging
+#
+set -euo pipefail
+
+# ─────────────────────────── config ────────────────────────────────────
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SCRIPTS_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+PROJECT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+MNT="$PROJECT_DIR/target/e2e/mnt"
+MUSIC_DIR="$PROJECT_DIR/target/e2e/music"
+LOG_DIR="$PROJECT_DIR/logs/e2e"
+DB_NAME="musicfs_e2e"
+VM_NAME="musicfs-e2e"
+PORT=50061
+KEEP="${KEEP:-0}"
+RUST_LOG_VAL="${RUST_LOG:-musicfs=debug}"
+
+CLIENT_PID=""
+STARTED_PG=""
+VM_IP=""
+
+. "$SCRIPT_DIR/lib.sh"
+. "$SCRIPT_DIR/resilience-helpers.sh"
+
+log()  { printf '\033[1;34m[e2e]\033[0m %s\n' "$*" >&2; }
+die()  { printf '\033[1;31m[e2e error]\033[0m %s\n' "$*" >&2; exit 1; }
+
+# ──────────────────────── postgres ─────────────────────────────────────
+ensure_postgres() {
+  if pg_isready -h "$PGHOST" >/dev/null 2>&1; then return 0; fi
+  log "Postgres not running — starting via devenv…"
+  devenv up postgres &
+  STARTED_PG=$!
+  local i
+  for ((i = 0; i < 45; i++)); do
+    if pg_isready -h "$PGHOST" >/dev/null 2>&1; then
+      log "Postgres ready"
+      return 0
+    fi
+    sleep 1
+  done
+  die "Postgres did not become ready in 45s"
+}
+
+stop_postgres() {
+  [[ -n "$STARTED_PG" ]] || return 0
+  log "stopping Postgres (started by this script)…"
+  kill "$STARTED_PG" 2>/dev/null || true
+  wait "$STARTED_PG" 2>/dev/null || true
+  STARTED_PG=""
+}
+
+# ──────────────────────── VM management ────────────────────────────────
+vm_ip() { incus list "$VM_NAME" -f csv -c 4 2>/dev/null | head -1 | awk '{print $1}'; }
+
+detect_e2e_ip() {
+  local bridge_cidr
+  bridge_cidr="$(incus network get incusbr0 ipv4.address 2>/dev/null || true)"
+  if [[ -z "$bridge_cidr" ]]; then echo ""; return; fi
+  local gateway="${bridge_cidr%%/*}"
+  echo "${gateway%.*}.146"
+}
+
+start_vm() {
+  log "starting VM '$VM_NAME' (port $PORT)…"
+  local e2e_ip; e2e_ip="$(detect_e2e_ip)"
+  VM_NAME="$VM_NAME" \
+  VM_IP="$e2e_ip" \
+  MUSIC_SOURCE="$MUSIC_DIR" \
+  LISTEN_PORT="$PORT" \
+  RUST_LOG=debug \
+  bash "$SCRIPTS_DIR/vm.sh" up
+
+  VM_IP="$(vm_ip)"
+  [[ -n "$VM_IP" ]] || die "could not determine VM IP"
+  log "VM IP: $VM_IP"
+
+  log "waiting for health check…"
+  local i
+  for ((i = 0; i < 45; i++)); do
+    if grpcurl -plaintext "$VM_IP:$PORT" grpc.health.v1.Health/Check 2>/dev/null | grep -q SERVING; then
+      log "server healthy"
+      return
+    fi
+    sleep 1
+  done
+  die "server health check timed out"
+}
+
+destroy_vm() {
+  VM_NAME="$VM_NAME" bash "$SCRIPTS_DIR/vm.sh" destroy 2>/dev/null || true
+}
+
+# ──────────────────────── DB management ────────────────────────────────
+reset_db() {
+  log "resetting database '$DB_NAME'…"
+  dropdb --if-exists "$DB_NAME" 2>/dev/null || true
+  createdb "$DB_NAME"
+  psql -q -d "$DB_NAME" -f "$PROJECT_DIR/db/schema.sql"
+}
+
+drop_db() {
+  dropdb --if-exists "$DB_NAME" 2>/dev/null || true
+}
+
+# ────────────────────── client lifecycle ───────────────────────────────
+build_client() {
+  log "building client…"
+  (cd "$PROJECT_DIR" && cargo build --bin musicfs)
+}
+
+start_client() {
+  mkdir -p "$MNT" "$LOG_DIR"
+  local dsn="postgresql://fujin@localhost/$DB_NAME?host=$PGHOST"
+
+  log "starting client (mountpoint $MNT)…"
+  RUST_LOG="$RUST_LOG_VAL" \
+  "$PROJECT_DIR/target/debug/musicfs" \
+    --source "http://$VM_IP:$PORT" \
+    --mountpoint "$MNT" \
+    --database "$dsn" \
+    --log-dir "$LOG_DIR" &
+  CLIENT_PID=$!
+  wait_for_mount
+}
+
+wait_for_mount() {
+  log "waiting for FUSE mount…"
+  local i
+  for ((i = 0; i < 60; i++)); do
+    if [[ -d "$MNT/E2E Artist A" ]]; then
+      log "mount ready"
+      return
+    fi
+    if ! kill -0 "$CLIENT_PID" 2>/dev/null; then
+      die "client process exited prematurely — check $LOG_DIR"
+    fi
+    sleep 1
+  done
+  die "FUSE mount not ready after 60s"
+}
+
+stop_client() {
+  [[ -n "$CLIENT_PID" ]] || return 0
+  kill "$CLIENT_PID" 2>/dev/null || true
+  local i
+  for ((i = 0; i < 10; i++)); do
+    kill -0 "$CLIENT_PID" 2>/dev/null || break
+    sleep 1
+  done
+  kill -9 "$CLIENT_PID" 2>/dev/null || true
+  wait "$CLIENT_PID" 2>/dev/null || true
+  CLIENT_PID=""
+  fusermount -u "$MNT" 2>/dev/null || true
+  sleep 1
+}
+
+# ─────────────────────────── cleanup ───────────────────────────────────
+cleanup() {
+  local rv=$?
+  log "cleaning up…"
+  stop_client || true
+  if [[ "$KEEP" != "1" ]]; then
+    drop_db
+    destroy_vm
+    stop_postgres || true
+    rm -rf "$MNT"
+  else
+    log "KEEP=1 — VM, DB, and mount left intact for debugging"
+    log "  mountpoint: $MNT"
+    log "  VM IP:      ${VM_IP:-<unknown>}"
+    log "  logs:       $LOG_DIR"
+  fi
+  exit $rv
+}
+trap cleanup EXIT
+
+# ─────────────────────────── paths ─────────────────────────────────────
+ALPHA="$MNT/E2E Artist A/E2E Album X/01 - Alpha.flac"
+BETA="$MNT/E2E Artist A/E2E Album X/02 - Beta.flac"
+GAMMA="$MNT/E2E Artist B/E2E Album Y/01 - Gamma.mp3"
+DELTA="$MNT/E2E Artist B/E2E Album Y/02 - Delta.mp3"
+
+# ════════════════════════════════════════════════════════════════════════
+# RESILIENCE SCENARIOS
+# ════════════════════════════════════════════════════════════════════════
+
+# ── Scenario 1: Server Stop → Outage Window → Server Start → Recovery ──
+#
+# Disruption: systemctl stop musicfs-server.service
+# Tests: FUSE error handling (EIO for uncached reads), cache fallback,
+#        tonic lazy channel auto-reconnect after clean server shutdown.
+test_server_stop_start() {
+  printf '\n\033[1;36m── scenario 1: server stop/start ──\033[0m\n'
+  clear_cache
+
+  local watch_marker; watch_marker="$(log_line_count)"
+
+  # Baseline: read works
+  assert_fuse_read_ok "baseline — read Alpha (uncached)" "$ALPHA"
+
+  # Cache Alpha by reading it; leave Gamma uncached
+  # (Alpha is now cached from the read above)
+
+  # ── Disruption: stop server ──
+  server_stop
+  assert_health_down "server is down after stop"
+
+  # During outage
+  assert_fuse_read_ok "outage — cached read Alpha succeeds" "$ALPHA"
+  assert_fuse_eio_within "outage — uncached read Gamma fails (EIO)" "$GAMMA"
+  assert_dir_listing "outage — directory listing still works" "$MNT" "E2E Artist A"
+
+  # ── Recovery: start server ──
+  server_start
+  assert_health_up "server recovered after start"
+  assert_fuse_read_ok "recovery — uncached read Gamma succeeds" "$GAMMA"
+  assert_metaflac_write_readback "recovery — FLAC write after outage" "$BETA" "ARTIST" "Recovered Artist"
+
+  # EXPECTED FAILURE: watcher should resubscribe quickly after a clean server
+  # restart. Currently it sleeps a full POLL_FALLBACK_INTERVAL (30s) before
+  # retrying — no exponential backoff or fast-retry on recoverable errors.
+  local resub=0 j
+  for ((j = 0; j < 10; j++)); do
+    if log_contains_since "subscribed to /events" "$watch_marker"; then
+      resub=1
+      break
+    fi
+    sleep 1
+  done
+  if (( resub == 1 )); then
+    _res_pass "watcher resubscribed within 10s of server restart"
+  else
+    _res_fail "watcher resubscribed within 10s of server restart (stuck in 30s retry — no fast reconnect)"
+  fi
+}
+
+# ── Scenario 2: Network Partition via incus pause → Resume ──
+#
+# Disruption: incus pause (freezes VM — TCP connections go silent)
+# Tests: Silent partition behavior. Uncached reads will hang (no tonic
+#        timeout/keepalive). After resume, client should recover.
+#
+# IMPORTANT: The FUSE daemon (fuser) dispatches requests serially on a single
+# thread. An uncached read during a silent partition blocks the daemon in
+# block_on(fetch_file_range()) indefinitely — queuing ALL subsequent FUSE
+# operations. Therefore:
+#   1. Do all non-blocking FUSE ops (dir listing) BEFORE the blocking read.
+#   2. Resume the VM IMMEDIATELY after the blocking read.
+#   3. Only attempt more FUSE ops after the daemon unblocks.
+test_network_partition() {
+  printf '\n\033[1;36m── scenario 2: network partition (incus pause) ──\033[0m\n'
+  ensure_clean_state
+
+  # Baseline
+  assert_fuse_read_ok "baseline — read Alpha" "$ALPHA"
+
+  # ── Disruption: freeze VM ──
+  vm_pause
+  assert_health_down "server unreachable during pause"
+
+  # Dir listing works (in-memory, no network) — must do this BEFORE the
+  # blocking read below, which freezes the single-threaded FUSE daemon.
+  assert_dir_listing "partition — directory listing (pre-block)" "$MNT" "E2E Artist A"
+
+  # EXPECTED FAILURE: with proper tonic timeout/keepalive, this read should
+  # return EIO within ~10s. Instead it HANGS indefinitely because no timeout
+  # is configured — block_on(fetch_file_range()) never returns while the VM
+  # is paused. timeout kills dd at 10s, but the daemon thread stays stuck.
+  assert_fuse_eio_within "partition — uncached read Gamma returns EIO within 10s" "$GAMMA" 10
+
+  # ── Recovery: resume VM immediately ──
+  # After resume, the pending gRPC call completes (server processes the
+  # in-flight request), unblocking the FUSE daemon thread.
+  vm_resume
+  assert_health_up "server recovered after resume"
+  assert_recovered "recovery — client reads after partition" "$GAMMA"
+  assert_fuse_read_ok "recovery — cached read Alpha" "$ALPHA"
+}
+
+# ── Scenario 3: Cache Resilience During Full Outage ──
+#
+# Disruption: systemctl stop (server down for entire test)
+# Tests: Postgres-backed cache provides degraded read-only mode.
+#        All pre-warmed files are fully readable. Writes to cached files
+#        work (local DB path). Writes to uncached files fail gracefully.
+test_cache_resilience() {
+  printf '\n\033[1;36m── scenario 3: cache resilience during outage ──\033[0m\n'
+  ensure_clean_state
+
+  # Pre-warm: read every file so all are in Postgres cache
+  prewarm_all
+
+  # Verify prewarm worked (all files cached)
+  assert_fuse_metaflac_ok "prewarm — Alpha metaflac read" "$ALPHA"
+  assert_fuse_id3v2_ok "prewarm — Gamma id3v2 read" "$GAMMA"
+
+  # ── Disruption: stop server for entire scenario ──
+  server_stop
+  assert_health_down "server down for cache test"
+
+  # Cached reads — all should succeed from Postgres cache
+  assert_fuse_metaflac_ok "outage — cached FLAC metaflac (Alpha)" "$ALPHA"
+  assert_fuse_metaflac_ok "outage — cached FLAC metaflac (Beta)" "$BETA"
+  assert_fuse_id3v2_ok "outage — cached MP3 id3v2 (Gamma)" "$GAMMA"
+  assert_fuse_id3v2_ok "outage — cached MP3 id3v2 (Delta)" "$DELTA"
+  assert_fuse_ffprobe_ok "outage — cached ffprobe (Alpha)" "$ALPHA"
+
+  # Write to cached file — should succeed (write path is local DB only)
+  assert_metaflac_write_readback "outage — write to cached FLAC (Beta)" "$BETA" "ARTIST" "Cache Outage Artist"
+
+  # Directory listing — in-memory, no server needed
+  assert_dir_listing "outage — dir listing works" "$MNT" "E2E Artist B"
+
+  # ── Recovery ──
+  server_start
+  assert_health_up "server recovered"
+  assert_metaflac_write_readback "recovery — write after cache outage" "$BETA" "ARTIST" "Post Outage Artist"
+}
+
+# ── Scenario 4: Long Outage + Watcher Recovery ──
+#
+# Disruption: incus pause for 90s (> 2x POLL_FALLBACK_INTERVAL of 30s)
+# Tests: Watcher retry loop stamina during prolonged partition.
+#        After resume, watcher resubscribes and reconcile succeeds.
+test_long_outage_watcher() {
+  printf '\n\033[1;36m── scenario 4: long outage + watcher recovery ──\033[0m\n'
+  ensure_clean_state
+
+  assert_log_contains "baseline — watcher subscribed" "subscribed to /events"
+
+  local marker; marker="$(log_line_count)"
+
+  vm_pause
+  assert_health_down "server unreachable during long pause"
+
+  # EXPECTED FAILURE: watcher should detect the dead stream within ~30s
+  # (POLL_FALLBACK_INTERVAL). Instead it's stuck on stream.next() for ~70s
+  # until the HTTP/2 transport layer times out — no keepalive is configured
+  # to detect the silent partition sooner.
+  local watcher_pattern="stream error\|subscribe failed\|poll reconcile failed"
+  local detected=0
+  local i
+  for ((i = 0; i < 30; i++)); do
+    check_client_alive || break
+    if log_contains_since "$watcher_pattern" "$marker"; then
+      detected=1
+      break
+    fi
+    sleep 1
+  done
+
+  if (( detected == 1 )); then
+    _res_pass "watcher detected silent partition within 30s"
+  else
+    _res_fail "watcher detected silent partition within 30s (stuck on stream.next — no keepalive)"
+  fi
+
+  assert_dir_listing "long outage — dir listing works" "$MNT" "E2E Artist A"
+  check_client_alive || die "client died during long outage"
+
+  vm_resume
+  assert_health_up "server recovered after long pause"
+  assert_recovered "client reads after long outage" "$ALPHA"
+
+  local resub=0 j
+  for ((j = 0; j < 10; j++)); do
+    if log_contains_since "subscribed to /events" "$marker"; then
+      resub=1
+      break
+    fi
+    sleep 1
+  done
+  if (( resub == 1 )); then
+    _res_pass "watcher resubscribed within 10s of recovery"
+  else
+    _res_fail "watcher resubscribed within 10s of recovery (stuck in 30s retry — no fast reconnect)"
+  fi
+}
+
+# ════════════════════════════════════════════════════════════════════════
+# MAIN
+# ════════════════════════════════════════════════════════════════════════
+
+main() {
+  [[ -n "${PGHOST:-}" ]] || die "PGHOST not set — run inside devenv shell"
+  ensure_postgres
+  command -v incus    >/dev/null || die "incus not found"
+  command -v grpcurl  >/dev/null || die "grpcurl not found"
+  command -v metaflac >/dev/null || die "metaflac not found"
+  command -v id3v2    >/dev/null || die "id3v2 not found"
+  command -v ffprobe  >/dev/null || die "ffprobe not found"
+
+  log "=== Resilience E2E suite start ==="
+
+  # Phase 0: fixtures
+  bash "$SCRIPT_DIR/make-fixtures.sh" "$MUSIC_DIR"
+
+  # Phase 1: server
+  start_vm
+
+  # Phase 2: client
+  build_client
+  reset_db
+  start_client
+
+  # Phase 3: resilience scenarios
+  test_server_stop_start
+  test_network_partition
+  test_cache_resilience
+  test_long_outage_watcher
+
+  # Summary
+  printf '\n'
+  summary
+  local rv=$?
+  log "=== Resilience E2E suite done ==="
+  exit $rv
+}
+
+main "$@"

scripts/e2e/run.sh

@@ -62,9 +62,21 @@ stop_postgres() {
 # ──────────────────────── VM management ────────────────────────────────
 vm_ip() { incus list "$VM_NAME" -f csv -c 4 2>/dev/null | head -1 | awk '{print $1}'; }
 
+detect_e2e_ip() {
+  local bridge_cidr
+  bridge_cidr="$(incus network get incusbr0 ipv4.address 2>/dev/null || true)"
+  if [[ -z "$bridge_cidr" ]]; then echo ""; return; fi
+  local gateway="${bridge_cidr%%/*}"
+  echo "${gateway%.*}.146"
+}
+
 start_vm() {
   log "starting VM '$VM_NAME' (port $PORT)…"
+  # e2e VM uses .146 to avoid colliding with the dev VM (.145)
+  local e2e_ip
+  e2e_ip="$(detect_e2e_ip)"
   VM_NAME="$VM_NAME" \
+  VM_IP="$e2e_ip" \
   MUSIC_SOURCE="$MUSIC_DIR" \
   LISTEN_PORT="$PORT" \
   RUST_LOG=debug \

scripts/vm.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env -S nix shell nixpkgs#bash --command bash
 #
 # vm.sh - Incus VM launcher for musicfs-server
 #
@@ -30,6 +30,8 @@
 #   MUSIC_MOUNT   where it appears inside the VM       (default: /music)
 #   LISTEN_PORT   gRPC port (host:vm forwarded)        (default: 50051)
 #   RUST_LOG      tracing filter for the server        (default: info)
+#   READONLY      mount music as read-only (0=writable) (default: 1)
+#   VM_IP         static IPv4 for the VM                (default: auto-detected from incusbr0, gateway.145)
 #
 set -euo pipefail
 
@@ -40,8 +42,15 @@ MUSIC_SOURCE="${MUSIC_SOURCE:-$HOME/Music}"
 MUSIC_MOUNT="${MUSIC_MOUNT:-/music}"
 LISTEN_PORT="${LISTEN_PORT:-50051}"
 RUST_LOG="${RUST_LOG:-info}"
+detect_static_ip() {
+  if [[ -n "${VM_IP:-}" ]]; then echo "$VM_IP"; return; fi
+  local bridge_cidr
+  bridge_cidr="$(incus network get incusbr0 ipv4.address 2>/dev/null || true)"
+  if [[ -z "$bridge_cidr" ]]; then echo ""; return; fi
+  local gateway="${bridge_cidr%%/*}"
+  echo "${gateway%.*}.145"
+}
 
-# Fixed inside the VM; the bundle's interpreter+rpath point here.
 SERVER_DIR="/opt/musicfs"
 LOG_DIR="/var/log/musicfs"
 BIN_NAME="musicfs-server"
@@ -60,7 +69,12 @@ vm_running() { incus list "$VM_NAME" -f csv -c n,s 2>/dev/null | grep -q "$VM_NA
 device_exists() { incus config device show "$VM_NAME" 2>/dev/null | grep -q "^$1:"; }
 
 # incus -c 4 emits "<ip> (<iface>)"; keep only the address.
-vm_ip() { incus list "$VM_NAME" -f csv -c 4 2>/dev/null | head -1 | awk '{print $1}'; }
+vm_ip() {
+  local ip
+  ip="$(incus list "$VM_NAME" -f csv -c 4 2>/dev/null | head -1 | awk '{print $1}')"
+  if [[ -n "$ip" ]]; then echo "$ip"; return; fi
+  detect_static_ip
+}
 
 # ──────────────────────────── build + bundle ───────────────────────────
 # Emits the host path to the prepared bundle dir on stdout.
@@ -120,10 +134,24 @@ create_vm() {
   log "creating VM '$VM_NAME' from $IMAGE ..."
   incus init "$IMAGE" "$VM_NAME" --vm
 
+  local static_ip
+  static_ip="$(detect_static_ip)"
+  if [[ -n "$static_ip" ]]; then
+    log "reserving static IP: $static_ip"
+    incus config device add "$VM_NAME" eth0 nic \
+      network=incusbr0 name=eth0 ipv4.address="$static_ip"
+  fi
+
   if ! device_exists music; then
-    log "sharing music: $MUSIC_SOURCE -> $MUSIC_MOUNT (readonly, virtiofs)"
+    local ro_flag="readonly=true"
+    local mode="read-only"
+    if [[ "$READONLY" == "0" ]]; then
+      ro_flag="readonly=false"
+      mode="read-write"
+    fi
+    log "sharing music: $MUSIC_SOURCE -> $MUSIC_MOUNT ($mode, virtiofs)"
     incus config device add "$VM_NAME" music disk \
-      source="$MUSIC_SOURCE" path="$MUSIC_MOUNT" readonly=true
+      source="$MUSIC_SOURCE" path="$MUSIC_MOUNT" "$ro_flag"
   fi
 
   # No proxy: Incus VM proxies need NAT mode + a *static* instance IP (DHCP is
@@ -151,11 +179,7 @@ wait_for_vm() {
 deploy() {
   local bundle; bundle="$(build_bundle)"
   log "deploying bundle to $VM_NAME:$SERVER_DIR ..."
-  # Stop first: overwriting a running binary fails with ETXTBSY ("text file busy").
-  if incus exec "$VM_NAME" -- systemctl is-active --quiet "$UNIT_NAME" 2>/dev/null; then
-    log "stopping $UNIT_NAME (binary in use)..."
-    incus exec "$VM_NAME" -- systemctl stop "$UNIT_NAME"
-  fi
+  incus exec "$VM_NAME" -- systemctl stop "$UNIT_NAME" 2>/dev/null || true
   incus exec "$VM_NAME" -- mkdir -p "$SERVER_DIR/lib" "$LOG_DIR"
   incus file push "$bundle/server" "$VM_NAME$SERVER_DIR/server" --mode=0755
   # Ship the bundled libs one by one (robust across incus file-push versions).
@@ -255,7 +279,15 @@ print_status() {
   printf '  ipv4:    %s\n' "${ip:-<none>}"
   printf '  image:   %s\n' "$IMAGE"
   printf '  listen:  0.0.0.0:%s (reach via VM bridge IP above)\n' "$LISTEN_PORT"
-  printf '  music:   %s -> %s\n' "$MUSIC_SOURCE" "$MUSIC_MOUNT"
+  local ro_actual="read-only"
+  if vm_exists; then
+    local ro_val
+    ro_val="$(incus config device get "$VM_NAME" music readonly 2>/dev/null || true)"
+    [[ "$ro_val" == "false" ]] && ro_actual="read-write"
+  else
+    [[ "$READONLY" == "0" ]] && ro_actual="read-write"
+  fi
+  printf '  music:   %s -> %s (%s)\n' "$MUSIC_SOURCE" "$MUSIC_MOUNT" "$ro_actual"
   printf '  server:  %s/server\n' "$SERVER_DIR"
   if [ -n "$ip" ]; then
     printf '\n  test:    grpcurl -plaintext %s:%s list\n\n' "$ip" "$LISTEN_PORT"
@@ -273,7 +305,18 @@ usage() {
 }
 
 main() {
-  case "${1:-up}" in
+  local cmd="${1:-up}"
+  shift || true
+  while (( $# )); do
+    case "$1" in
+      --writable) [[ -z "${READONLY:-}" ]] && READONLY=0 ;;
+      --readonly) [[ -z "${READONLY:-}" ]] && READONLY=1 ;;
+      *) die "unknown flag '$1'. Try: $0 --help" ;;
+    esac
+    shift
+  done
+  READONLY="${READONLY:-1}"
+  case "$cmd" in
     up)        cmd_up ;;
     redeploy)  cmd_redeploy ;;
     restart)   cmd_restart ;;
@@ -283,7 +326,7 @@ main() {
     down)      cmd_down ;;
     destroy)   cmd_destroy ;;
     -h|--help|help) usage ;;
-    *) die "unknown command '$1'. Try: $0 --help" ;;
+    *) die "unknown command '$cmd'. Try: $0 --help" ;;
   esac
 }
 

src/lib.rs

@@ -1,8 +0,0 @@
-pub mod db;
-pub mod item;
-pub mod logging;
-pub mod music;
-pub mod origins;
-pub mod proto;
-pub mod server;
-pub mod virtual_dirs;

src/music/metadata.rs

@@ -1,153 +0,0 @@
-use symphonia::core::meta::{MetadataRevision, StandardTagKey};
-
-#[derive(Debug, Default, Clone)]
-pub struct MusicMetadata {
-    pub artist: Vec<String>,
-    pub album_artist: Option<String>,
-    pub album: String,
-    pub track_number: i32,
-    pub track_title: String,
-    pub other_tags: Vec<String>,
-    pub header: Vec<u8>,
-    /// Per-externalized-region reinsert prefix kept in memory. FLAC stores its
-    /// 4-byte PICTURE block header here; MP3 keeps whole frames in the original
-    /// file and stores an empty prefix.
-    pub picture_block_headers: Vec<Vec<u8>>,
-    pub picture_data_ranges: Vec<(u64, u64)>,
-    pub real_audio_start: u64,
-    pub vorbis_comment_offset: u64,
-    pub vorbis_comment_length: u64,
-}
-
-impl MusicMetadata {
-    /// Size of the virtual file: rebuilt header + externalized regions + the
-    /// original audio tail. Format-agnostic.
-    pub fn virtual_size(&self, real_file_size: u64) -> u64 {
-        let pictures_size: u64 = self
-            .picture_block_headers
-            .iter()
-            .zip(self.picture_data_ranges.iter())
-            .map(|(prefix, (_, len))| prefix.len() as u64 + len)
-            .sum();
-        self.header.len() as u64 + pictures_size + (real_file_size - self.real_audio_start)
-    }
-}
-
-/// Map symphonia's normalized tags onto the shared `MusicMetadata` fields.
-/// Used by every format parser so the field mapping lives in one place.
-pub(crate) fn extract_standard_tags(revision: &MetadataRevision, out: &mut MusicMetadata) {
-    for tag in revision.tags() {
-        let value = tag.value.to_string();
-        match tag.std_key {
-            Some(StandardTagKey::Artist) => out.artist.push(value),
-            Some(StandardTagKey::AlbumArtist) => out.album_artist = Some(value),
-            Some(StandardTagKey::Album) => out.album = value,
-            Some(StandardTagKey::TrackNumber) => {
-                out.track_number = value.parse::<i32>().unwrap_or(0)
-            }
-            Some(StandardTagKey::TrackTitle) => out.track_title = value,
-            _ => out.other_tags.push(format!("{}={}", tag.key, value)),
-        }
-    }
-}
-
-pub mod db {
-    pub mod music_metadata {
-        use sea_orm::entity::prelude::*;
-
-        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
-        #[sea_orm(table_name = "music_metadata")]
-        pub struct Model {
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub inode: i64,
-            pub track_title: String,
-            pub album: String,
-            pub track_number: i32,
-            #[sea_orm(column_type = "Blob")]
-            pub header: Vec<u8>,
-            pub real_audio_start: i64,
-        }
-
-        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
-        pub enum Relation {}
-
-        impl ActiveModelBehavior for ActiveModel {}
-    }
-
-    pub mod artists {
-        use sea_orm::entity::prelude::*;
-
-        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
-        #[sea_orm(table_name = "music_metadata_artists")]
-        pub struct Model {
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub inode: i64,
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub artist: String,
-        }
-
-        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
-        pub enum Relation {}
-
-        impl ActiveModelBehavior for ActiveModel {}
-    }
-
-    pub mod other_tags {
-        use sea_orm::entity::prelude::*;
-
-        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
-        #[sea_orm(table_name = "music_metadata_other_tags")]
-        pub struct Model {
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub inode: i64,
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub position: i32,
-            pub tag: String,
-        }
-
-        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
-        pub enum Relation {}
-
-        impl ActiveModelBehavior for ActiveModel {}
-    }
-
-    pub mod pictures {
-        use sea_orm::entity::prelude::*;
-
-        #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
-        #[sea_orm(table_name = "music_metadata_pictures")]
-        pub struct Model {
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub inode: i64,
-            #[sea_orm(primary_key, auto_increment = false)]
-            pub position: i32,
-            #[sea_orm(column_type = "Blob")]
-            pub block_header: Vec<u8>,
-            pub data_offset: i64,
-            pub data_length: i64,
-        }
-
-        #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
-        pub enum Relation {}
-
-        impl ActiveModelBehavior for ActiveModel {}
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn virtual_size_calculation() {
-        let mut metadata = MusicMetadata::default();
-        metadata.header = vec![0u8; 100];
-        metadata.picture_block_headers = vec![vec![0u8; 4]];
-        metadata.picture_data_ranges = vec![(0, 50)];
-        metadata.real_audio_start = 200;
-        let file_size = 1000u64;
-        let virtual_size = metadata.virtual_size(file_size);
-        // 100 (header) + 4 (prefix) + 50 (picture data) + 800 (audio tail)
-        assert_eq!(virtual_size, 954);
-    }
-}

src/proto/generated/musicfs/musicfs.rs

@@ -1,459 +0,0 @@
-// @generated
-// This file is @generated by prost-build.
-#[derive(Clone, PartialEq, ::prost::Message)]
-pub struct ReconcileRequest {
-    #[prost(message, repeated, tag = "1")]
-    pub entries: ::prost::alloc::vec::Vec<InodeHash>,
-}
-#[derive(Clone, PartialEq, ::prost::Message)]
-pub struct ReconcileResponse {
-    #[prost(message, repeated, tag = "1")]
-    pub changed: ::prost::alloc::vec::Vec<InodeHash>,
-    #[prost(uint64, repeated, tag = "2")]
-    pub deleted: ::prost::alloc::vec::Vec<u64>,
-}
-#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct InodeHash {
-    #[prost(uint64, tag = "1")]
-    pub inode: u64,
-    #[prost(uint64, tag = "2")]
-    pub hash: u64,
-}
-#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct GetMetadataRequest {
-    #[prost(uint64, repeated, tag = "1")]
-    pub inodes: ::prost::alloc::vec::Vec<u64>,
-}
-#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct GetManifestRequest {}
-#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct GetFileRequest {
-    #[prost(uint64, tag = "1")]
-    pub id: u64,
-    /// When both are zero the server streams the entire file.
-    #[prost(uint64, tag = "2")]
-    pub start: u64,
-    #[prost(uint64, tag = "3")]
-    pub length: u64,
-}
-#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct SubscribeEventsRequest {}
-#[derive(Clone, PartialEq, ::prost::Message)]
-pub struct ManifestEntry {
-    #[prost(uint64, tag = "1")]
-    pub id: u64,
-    #[prost(string, tag = "2")]
-    pub rel_path: ::prost::alloc::string::String,
-    #[prost(uint64, tag = "3")]
-    pub size: u64,
-    #[prost(uint64, tag = "4")]
-    pub mtime: u64,
-    #[prost(uint64, tag = "5")]
-    pub ctime: u64,
-    #[prost(uint64, tag = "6")]
-    pub crtime: u64,
-    #[prost(message, optional, tag = "7")]
-    pub music_metadata: ::core::option::Option<MusicMetadata>,
-}
-#[derive(Clone, PartialEq, ::prost::Message)]
-pub struct MusicMetadata {
-    #[prost(string, repeated, tag = "1")]
-    pub artist: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
-    #[prost(string, optional, tag = "2")]
-    pub album_artist: ::core::option::Option<::prost::alloc::string::String>,
-    #[prost(string, tag = "3")]
-    pub album: ::prost::alloc::string::String,
-    #[prost(int32, tag = "4")]
-    pub track_number: i32,
-    #[prost(string, tag = "5")]
-    pub track_title: ::prost::alloc::string::String,
-    #[prost(string, repeated, tag = "6")]
-    pub other_tags: ::prost::alloc::vec::Vec<::prost::alloc::string::String>,
-    #[prost(bytes = "vec", tag = "7")]
-    pub header: ::prost::alloc::vec::Vec<u8>,
-    #[prost(bytes = "vec", repeated, tag = "8")]
-    pub picture_block_headers: ::prost::alloc::vec::Vec<::prost::alloc::vec::Vec<u8>>,
-    #[prost(message, repeated, tag = "9")]
-    pub picture_data_ranges: ::prost::alloc::vec::Vec<PictureDataRange>,
-    #[prost(uint64, tag = "10")]
-    pub real_audio_start: u64,
-    #[prost(uint64, tag = "11")]
-    pub vorbis_comment_offset: u64,
-    #[prost(uint64, tag = "12")]
-    pub vorbis_comment_length: u64,
-}
-#[derive(Clone, Copy, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct PictureDataRange {
-    #[prost(uint64, tag = "1")]
-    pub offset: u64,
-    #[prost(uint64, tag = "2")]
-    pub length: u64,
-}
-#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct FileChunk {
-    #[prost(bytes = "vec", tag = "1")]
-    pub data: ::prost::alloc::vec::Vec<u8>,
-    #[prost(uint64, tag = "2")]
-    pub offset: u64,
-    #[prost(uint64, tag = "3")]
-    pub total_size: u64,
-}
-#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
-pub struct ChangeEvent {
-    /// "create", "modify", or "remove".
-    #[prost(string, tag = "1")]
-    pub kind: ::prost::alloc::string::String,
-}
-/// Encoded file descriptor set for the `musicfs` package
-pub const FILE_DESCRIPTOR_SET: &[u8] = &[
-    0x0a, 0xb0, 0x2b, 0x0a, 0x0d, 0x6d, 0x75, 0x73, 0x69, 0x63, 0x66, 0x73, 0x2e, 0x70, 0x72, 0x6f,
-    0x74, 0x6f, 0x12, 0x07, 0x6d, 0x75, 0x73, 0x69, 0x63, 0x66, 0x73, 0x22, 0x40, 0x0a, 0x10, 0x52,
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-    0x74, 0x6f, 0x33,
-];
-include!("musicfs.tonic.rs");
-// @@protoc_insertion_point(module)

src/proto/generated/musicfs/musicfs.tonic.rs

@@ -1,544 +0,0 @@
-// @generated
-/// Generated client implementations.
-pub mod music_fs_client {
-    #![allow(
-        unused_variables,
-        dead_code,
-        missing_docs,
-        clippy::wildcard_imports,
-        clippy::let_unit_value
-    )]
-    use tonic::codegen::http::Uri;
-    use tonic::codegen::*;
-    #[derive(Debug, Clone)]
-    pub struct MusicFsClient<T> {
-        inner: tonic::client::Grpc<T>,
-    }
-    impl MusicFsClient<tonic::transport::Channel> {
-        /// Attempt to create a new client by connecting to a given endpoint.
-        pub async fn connect<D>(dst: D) -> Result<Self, tonic::transport::Error>
-        where
-            D: TryInto<tonic::transport::Endpoint>,
-            D::Error: Into<StdError>,
-        {
-            let conn = tonic::transport::Endpoint::new(dst)?.connect().await?;
-            Ok(Self::new(conn))
-        }
-    }
-    impl<T> MusicFsClient<T>
-    where
-        T: tonic::client::GrpcService<tonic::body::Body>,
-        T::Error: Into<StdError>,
-        T::ResponseBody: Body<Data = Bytes> + std::marker::Send + 'static,
-        <T::ResponseBody as Body>::Error: Into<StdError> + std::marker::Send,
-    {
-        pub fn new(inner: T) -> Self {
-            let inner = tonic::client::Grpc::new(inner);
-            Self { inner }
-        }
-        pub fn with_origin(inner: T, origin: Uri) -> Self {
-            let inner = tonic::client::Grpc::with_origin(inner, origin);
-            Self { inner }
-        }
-        pub fn with_interceptor<F>(
-            inner: T,
-            interceptor: F,
-        ) -> MusicFsClient<InterceptedService<T, F>>
-        where
-            F: tonic::service::Interceptor,
-            T::ResponseBody: Default,
-            T: tonic::codegen::Service<
-                    http::Request<tonic::body::Body>,
-                    Response = http::Response<
-                        <T as tonic::client::GrpcService<tonic::body::Body>>::ResponseBody,
-                    >,
-                >,
-            <T as tonic::codegen::Service<http::Request<tonic::body::Body>>>::Error:
-                Into<StdError> + std::marker::Send + std::marker::Sync,
-        {
-            MusicFsClient::new(InterceptedService::new(inner, interceptor))
-        }
-        /// Compress requests with the given encoding.
-        ///
-        /// This requires the server to support it otherwise it might respond with an
-        /// error.
-        #[must_use]
-        pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
-            self.inner = self.inner.send_compressed(encoding);
-            self
-        }
-        /// Enable decompressing responses.
-        #[must_use]
-        pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
-            self.inner = self.inner.accept_compressed(encoding);
-            self
-        }
-        /// Limits the maximum size of a decoded message.
-        ///
-        /// Default: `4MB`
-        #[must_use]
-        pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
-            self.inner = self.inner.max_decoding_message_size(limit);
-            self
-        }
-        /// Limits the maximum size of an encoded message.
-        ///
-        /// Default: `usize::MAX`
-        #[must_use]
-        pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
-            self.inner = self.inner.max_encoding_message_size(limit);
-            self
-        }
-        pub async fn reconcile(
-            &mut self,
-            request: impl tonic::IntoRequest<super::ReconcileRequest>,
-        ) -> std::result::Result<tonic::Response<super::ReconcileResponse>, tonic::Status> {
-            self.inner.ready().await.map_err(|e| {
-                tonic::Status::unknown(format!("Service was not ready: {}", e.into()))
-            })?;
-            let codec = tonic_prost::ProstCodec::default();
-            let path = http::uri::PathAndQuery::from_static("/musicfs.MusicFs/Reconcile");
-            let mut req = request.into_request();
-            req.extensions_mut()
-                .insert(GrpcMethod::new("musicfs.MusicFs", "Reconcile"));
-            self.inner.unary(req, path, codec).await
-        }
-        pub async fn get_metadata(
-            &mut self,
-            request: impl tonic::IntoRequest<super::GetMetadataRequest>,
-        ) -> std::result::Result<
-            tonic::Response<tonic::codec::Streaming<super::ManifestEntry>>,
-            tonic::Status,
-        > {
-            self.inner.ready().await.map_err(|e| {
-                tonic::Status::unknown(format!("Service was not ready: {}", e.into()))
-            })?;
-            let codec = tonic_prost::ProstCodec::default();
-            let path = http::uri::PathAndQuery::from_static("/musicfs.MusicFs/GetMetadata");
-            let mut req = request.into_request();
-            req.extensions_mut()
-                .insert(GrpcMethod::new("musicfs.MusicFs", "GetMetadata"));
-            self.inner.server_streaming(req, path, codec).await
-        }
-        pub async fn get_manifest(
-            &mut self,
-            request: impl tonic::IntoRequest<super::GetManifestRequest>,
-        ) -> std::result::Result<
-            tonic::Response<tonic::codec::Streaming<super::ManifestEntry>>,
-            tonic::Status,
-        > {
-            self.inner.ready().await.map_err(|e| {
-                tonic::Status::unknown(format!("Service was not ready: {}", e.into()))
-            })?;
-            let codec = tonic_prost::ProstCodec::default();
-            let path = http::uri::PathAndQuery::from_static("/musicfs.MusicFs/GetManifest");
-            let mut req = request.into_request();
-            req.extensions_mut()
-                .insert(GrpcMethod::new("musicfs.MusicFs", "GetManifest"));
-            self.inner.server_streaming(req, path, codec).await
-        }
-        pub async fn get_file(
-            &mut self,
-            request: impl tonic::IntoRequest<super::GetFileRequest>,
-        ) -> std::result::Result<
-            tonic::Response<tonic::codec::Streaming<super::FileChunk>>,
-            tonic::Status,
-        > {
-            self.inner.ready().await.map_err(|e| {
-                tonic::Status::unknown(format!("Service was not ready: {}", e.into()))
-            })?;
-            let codec = tonic_prost::ProstCodec::default();
-            let path = http::uri::PathAndQuery::from_static("/musicfs.MusicFs/GetFile");
-            let mut req = request.into_request();
-            req.extensions_mut()
-                .insert(GrpcMethod::new("musicfs.MusicFs", "GetFile"));
-            self.inner.server_streaming(req, path, codec).await
-        }
-        pub async fn subscribe_events(
-            &mut self,
-            request: impl tonic::IntoRequest<super::SubscribeEventsRequest>,
-        ) -> std::result::Result<
-            tonic::Response<tonic::codec::Streaming<super::ChangeEvent>>,
-            tonic::Status,
-        > {
-            self.inner.ready().await.map_err(|e| {
-                tonic::Status::unknown(format!("Service was not ready: {}", e.into()))
-            })?;
-            let codec = tonic_prost::ProstCodec::default();
-            let path = http::uri::PathAndQuery::from_static("/musicfs.MusicFs/SubscribeEvents");
-            let mut req = request.into_request();
-            req.extensions_mut()
-                .insert(GrpcMethod::new("musicfs.MusicFs", "SubscribeEvents"));
-            self.inner.server_streaming(req, path, codec).await
-        }
-    }
-}
-/// Generated server implementations.
-pub mod music_fs_server {
-    #![allow(
-        unused_variables,
-        dead_code,
-        missing_docs,
-        clippy::wildcard_imports,
-        clippy::let_unit_value
-    )]
-    use tonic::codegen::*;
-    /// Generated trait containing gRPC methods that should be implemented for use with MusicFsServer.
-    #[async_trait]
-    pub trait MusicFs: std::marker::Send + std::marker::Sync + 'static {
-        async fn reconcile(
-            &self,
-            request: tonic::Request<super::ReconcileRequest>,
-        ) -> std::result::Result<tonic::Response<super::ReconcileResponse>, tonic::Status>;
-        /// Server streaming response type for the GetMetadata method.
-        type GetMetadataStream: tonic::codegen::tokio_stream::Stream<
-                Item = std::result::Result<super::ManifestEntry, tonic::Status>,
-            > + std::marker::Send
-            + 'static;
-        async fn get_metadata(
-            &self,
-            request: tonic::Request<super::GetMetadataRequest>,
-        ) -> std::result::Result<tonic::Response<Self::GetMetadataStream>, tonic::Status>;
-        /// Server streaming response type for the GetManifest method.
-        type GetManifestStream: tonic::codegen::tokio_stream::Stream<
-                Item = std::result::Result<super::ManifestEntry, tonic::Status>,
-            > + std::marker::Send
-            + 'static;
-        async fn get_manifest(
-            &self,
-            request: tonic::Request<super::GetManifestRequest>,
-        ) -> std::result::Result<tonic::Response<Self::GetManifestStream>, tonic::Status>;
-        /// Server streaming response type for the GetFile method.
-        type GetFileStream: tonic::codegen::tokio_stream::Stream<
-                Item = std::result::Result<super::FileChunk, tonic::Status>,
-            > + std::marker::Send
-            + 'static;
-        async fn get_file(
-            &self,
-            request: tonic::Request<super::GetFileRequest>,
-        ) -> std::result::Result<tonic::Response<Self::GetFileStream>, tonic::Status>;
-        /// Server streaming response type for the SubscribeEvents method.
-        type SubscribeEventsStream: tonic::codegen::tokio_stream::Stream<
-                Item = std::result::Result<super::ChangeEvent, tonic::Status>,
-            > + std::marker::Send
-            + 'static;
-        async fn subscribe_events(
-            &self,
-            request: tonic::Request<super::SubscribeEventsRequest>,
-        ) -> std::result::Result<tonic::Response<Self::SubscribeEventsStream>, tonic::Status>;
-    }
-    #[derive(Debug)]
-    pub struct MusicFsServer<T> {
-        inner: Arc<T>,
-        accept_compression_encodings: EnabledCompressionEncodings,
-        send_compression_encodings: EnabledCompressionEncodings,
-        max_decoding_message_size: Option<usize>,
-        max_encoding_message_size: Option<usize>,
-    }
-    impl<T> MusicFsServer<T> {
-        pub fn new(inner: T) -> Self {
-            Self::from_arc(Arc::new(inner))
-        }
-        pub fn from_arc(inner: Arc<T>) -> Self {
-            Self {
-                inner,
-                accept_compression_encodings: Default::default(),
-                send_compression_encodings: Default::default(),
-                max_decoding_message_size: None,
-                max_encoding_message_size: None,
-            }
-        }
-        pub fn with_interceptor<F>(inner: T, interceptor: F) -> InterceptedService<Self, F>
-        where
-            F: tonic::service::Interceptor,
-        {
-            InterceptedService::new(Self::new(inner), interceptor)
-        }
-        /// Enable decompressing requests with the given encoding.
-        #[must_use]
-        pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
-            self.accept_compression_encodings.enable(encoding);
-            self
-        }
-        /// Compress responses with the given encoding, if the client supports it.
-        #[must_use]
-        pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
-            self.send_compression_encodings.enable(encoding);
-            self
-        }
-        /// Limits the maximum size of a decoded message.
-        ///
-        /// Default: `4MB`
-        #[must_use]
-        pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
-            self.max_decoding_message_size = Some(limit);
-            self
-        }
-        /// Limits the maximum size of an encoded message.
-        ///
-        /// Default: `usize::MAX`
-        #[must_use]
-        pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
-            self.max_encoding_message_size = Some(limit);
-            self
-        }
-    }
-    impl<T, B> tonic::codegen::Service<http::Request<B>> for MusicFsServer<T>
-    where
-        T: MusicFs,
-        B: Body + std::marker::Send + 'static,
-        B::Error: Into<StdError> + std::marker::Send + 'static,
-    {
-        type Response = http::Response<tonic::body::Body>;
-        type Error = std::convert::Infallible;
-        type Future = BoxFuture<Self::Response, Self::Error>;
-        fn poll_ready(
-            &mut self,
-            _cx: &mut Context<'_>,
-        ) -> Poll<std::result::Result<(), Self::Error>> {
-            Poll::Ready(Ok(()))
-        }
-        fn call(&mut self, req: http::Request<B>) -> Self::Future {
-            match req.uri().path() {
-                "/musicfs.MusicFs/Reconcile" => {
-                    #[allow(non_camel_case_types)]
-                    struct ReconcileSvc<T: MusicFs>(pub Arc<T>);
-                    impl<T: MusicFs> tonic::server::UnaryService<super::ReconcileRequest> for ReconcileSvc<T> {
-                        type Response = super::ReconcileResponse;
-                        type Future = BoxFuture<tonic::Response<Self::Response>, tonic::Status>;
-                        fn call(
-                            &mut self,
-                            request: tonic::Request<super::ReconcileRequest>,
-                        ) -> Self::Future {
-                            let inner = Arc::clone(&self.0);
-                            let fut =
-                                async move { <T as MusicFs>::reconcile(&inner, request).await };
-                            Box::pin(fut)
-                        }
-                    }
-                    let accept_compression_encodings = self.accept_compression_encodings;
-                    let send_compression_encodings = self.send_compression_encodings;
-                    let max_decoding_message_size = self.max_decoding_message_size;
-                    let max_encoding_message_size = self.max_encoding_message_size;
-                    let inner = self.inner.clone();
-                    let fut = async move {
-                        let method = ReconcileSvc(inner);
-                        let codec = tonic_prost::ProstCodec::default();
-                        let mut grpc = tonic::server::Grpc::new(codec)
-                            .apply_compression_config(
-                                accept_compression_encodings,
-                                send_compression_encodings,
-                            )
-                            .apply_max_message_size_config(
-                                max_decoding_message_size,
-                                max_encoding_message_size,
-                            );
-                        let res = grpc.unary(method, req).await;
-                        Ok(res)
-                    };
-                    Box::pin(fut)
-                }
-                "/musicfs.MusicFs/GetMetadata" => {
-                    #[allow(non_camel_case_types)]
-                    struct GetMetadataSvc<T: MusicFs>(pub Arc<T>);
-                    impl<T: MusicFs>
-                        tonic::server::ServerStreamingService<super::GetMetadataRequest>
-                        for GetMetadataSvc<T>
-                    {
-                        type Response = super::ManifestEntry;
-                        type ResponseStream = T::GetMetadataStream;
-                        type Future =
-                            BoxFuture<tonic::Response<Self::ResponseStream>, tonic::Status>;
-                        fn call(
-                            &mut self,
-                            request: tonic::Request<super::GetMetadataRequest>,
-                        ) -> Self::Future {
-                            let inner = Arc::clone(&self.0);
-                            let fut =
-                                async move { <T as MusicFs>::get_metadata(&inner, request).await };
-                            Box::pin(fut)
-                        }
-                    }
-                    let accept_compression_encodings = self.accept_compression_encodings;
-                    let send_compression_encodings = self.send_compression_encodings;
-                    let max_decoding_message_size = self.max_decoding_message_size;
-                    let max_encoding_message_size = self.max_encoding_message_size;
-                    let inner = self.inner.clone();
-                    let fut = async move {
-                        let method = GetMetadataSvc(inner);
-                        let codec = tonic_prost::ProstCodec::default();
-                        let mut grpc = tonic::server::Grpc::new(codec)
-                            .apply_compression_config(
-                                accept_compression_encodings,
-                                send_compression_encodings,
-                            )
-                            .apply_max_message_size_config(
-                                max_decoding_message_size,
-                                max_encoding_message_size,
-                            );
-                        let res = grpc.server_streaming(method, req).await;
-                        Ok(res)
-                    };
-                    Box::pin(fut)
-                }
-                "/musicfs.MusicFs/GetManifest" => {
-                    #[allow(non_camel_case_types)]
-                    struct GetManifestSvc<T: MusicFs>(pub Arc<T>);
-                    impl<T: MusicFs>
-                        tonic::server::ServerStreamingService<super::GetManifestRequest>
-                        for GetManifestSvc<T>
-                    {
-                        type Response = super::ManifestEntry;
-                        type ResponseStream = T::GetManifestStream;
-                        type Future =
-                            BoxFuture<tonic::Response<Self::ResponseStream>, tonic::Status>;
-                        fn call(
-                            &mut self,
-                            request: tonic::Request<super::GetManifestRequest>,
-                        ) -> Self::Future {
-                            let inner = Arc::clone(&self.0);
-                            let fut =
-                                async move { <T as MusicFs>::get_manifest(&inner, request).await };
-                            Box::pin(fut)
-                        }
-                    }
-                    let accept_compression_encodings = self.accept_compression_encodings;
-                    let send_compression_encodings = self.send_compression_encodings;
-                    let max_decoding_message_size = self.max_decoding_message_size;
-                    let max_encoding_message_size = self.max_encoding_message_size;
-                    let inner = self.inner.clone();
-                    let fut = async move {
-                        let method = GetManifestSvc(inner);
-                        let codec = tonic_prost::ProstCodec::default();
-                        let mut grpc = tonic::server::Grpc::new(codec)
-                            .apply_compression_config(
-                                accept_compression_encodings,
-                                send_compression_encodings,
-                            )
-                            .apply_max_message_size_config(
-                                max_decoding_message_size,
-                                max_encoding_message_size,
-                            );
-                        let res = grpc.server_streaming(method, req).await;
-                        Ok(res)
-                    };
-                    Box::pin(fut)
-                }
-                "/musicfs.MusicFs/GetFile" => {
-                    #[allow(non_camel_case_types)]
-                    struct GetFileSvc<T: MusicFs>(pub Arc<T>);
-                    impl<T: MusicFs> tonic::server::ServerStreamingService<super::GetFileRequest> for GetFileSvc<T> {
-                        type Response = super::FileChunk;
-                        type ResponseStream = T::GetFileStream;
-                        type Future =
-                            BoxFuture<tonic::Response<Self::ResponseStream>, tonic::Status>;
-                        fn call(
-                            &mut self,
-                            request: tonic::Request<super::GetFileRequest>,
-                        ) -> Self::Future {
-                            let inner = Arc::clone(&self.0);
-                            let fut =
-                                async move { <T as MusicFs>::get_file(&inner, request).await };
-                            Box::pin(fut)
-                        }
-                    }
-                    let accept_compression_encodings = self.accept_compression_encodings;
-                    let send_compression_encodings = self.send_compression_encodings;
-                    let max_decoding_message_size = self.max_decoding_message_size;
-                    let max_encoding_message_size = self.max_encoding_message_size;
-                    let inner = self.inner.clone();
-                    let fut = async move {
-                        let method = GetFileSvc(inner);
-                        let codec = tonic_prost::ProstCodec::default();
-                        let mut grpc = tonic::server::Grpc::new(codec)
-                            .apply_compression_config(
-                                accept_compression_encodings,
-                                send_compression_encodings,
-                            )
-                            .apply_max_message_size_config(
-                                max_decoding_message_size,
-                                max_encoding_message_size,
-                            );
-                        let res = grpc.server_streaming(method, req).await;
-                        Ok(res)
-                    };
-                    Box::pin(fut)
-                }
-                "/musicfs.MusicFs/SubscribeEvents" => {
-                    #[allow(non_camel_case_types)]
-                    struct SubscribeEventsSvc<T: MusicFs>(pub Arc<T>);
-                    impl<T: MusicFs>
-                        tonic::server::ServerStreamingService<super::SubscribeEventsRequest>
-                        for SubscribeEventsSvc<T>
-                    {
-                        type Response = super::ChangeEvent;
-                        type ResponseStream = T::SubscribeEventsStream;
-                        type Future =
-                            BoxFuture<tonic::Response<Self::ResponseStream>, tonic::Status>;
-                        fn call(
-                            &mut self,
-                            request: tonic::Request<super::SubscribeEventsRequest>,
-                        ) -> Self::Future {
-                            let inner = Arc::clone(&self.0);
-                            let fut = async move {
-                                <T as MusicFs>::subscribe_events(&inner, request).await
-                            };
-                            Box::pin(fut)
-                        }
-                    }
-                    let accept_compression_encodings = self.accept_compression_encodings;
-                    let send_compression_encodings = self.send_compression_encodings;
-                    let max_decoding_message_size = self.max_decoding_message_size;
-                    let max_encoding_message_size = self.max_encoding_message_size;
-                    let inner = self.inner.clone();
-                    let fut = async move {
-                        let method = SubscribeEventsSvc(inner);
-                        let codec = tonic_prost::ProstCodec::default();
-                        let mut grpc = tonic::server::Grpc::new(codec)
-                            .apply_compression_config(
-                                accept_compression_encodings,
-                                send_compression_encodings,
-                            )
-                            .apply_max_message_size_config(
-                                max_decoding_message_size,
-                                max_encoding_message_size,
-                            );
-                        let res = grpc.server_streaming(method, req).await;
-                        Ok(res)
-                    };
-                    Box::pin(fut)
-                }
-                _ => Box::pin(async move {
-                    let mut response = http::Response::new(tonic::body::Body::default());
-                    let headers = response.headers_mut();
-                    headers.insert(
-                        tonic::Status::GRPC_STATUS,
-                        (tonic::Code::Unimplemented as i32).into(),
-                    );
-                    headers.insert(
-                        http::header::CONTENT_TYPE,
-                        tonic::metadata::GRPC_CONTENT_TYPE,
-                    );
-                    Ok(response)
-                }),
-            }
-        }
-    }
-    impl<T> Clone for MusicFsServer<T> {
-        fn clone(&self) -> Self {
-            let inner = self.inner.clone();
-            Self {
-                inner,
-                accept_compression_encodings: self.accept_compression_encodings,
-                send_compression_encodings: self.send_compression_encodings,
-                max_decoding_message_size: self.max_decoding_message_size,
-                max_encoding_message_size: self.max_encoding_message_size,
-            }
-        }
-    }
-    /// Generated gRPC service name
-    pub const SERVICE_NAME: &str = "musicfs.MusicFs";
-    impl<T> tonic::server::NamedService for MusicFsServer<T> {
-        const NAME: &'static str = SERVICE_NAME;
-    }
-}

src/proto/mod.rs

@@ -1,19 +0,0 @@
-//! Generated protobuf + tonic bindings for the musicfs service.
-//!
-//! `buf generate` writes prost messages to `generated/musicfs/musicfs.rs` and
-//! the tonic service to `generated/musicfs/musicfs.tonic.rs`. The prost plugin
-//! appends `include!("musicfs.tonic.rs")` to the end of `musicfs.rs`, so
-//! including that one file here also pulls in the service. The only glue buf
-//! does not generate is the module named after the proto package (`musicfs`),
-//! which we provide below before re-exporting the types callers use.
-pub mod musicfs {
-    include!("generated/musicfs/musicfs.rs");
-}
-
-pub use musicfs::{
-    ChangeEvent, FileChunk, GetFileRequest, GetManifestRequest, GetMetadataRequest, InodeHash,
-    ManifestEntry, MusicMetadata, PictureDataRange, ReconcileRequest, ReconcileResponse,
-    SubscribeEventsRequest,
-    music_fs_client::MusicFsClient,
-    music_fs_server::{MusicFs, MusicFsServer},
-};

src/virtual_dirs.rs

@@ -1,267 +0,0 @@
-use std::{
-    collections::BTreeMap,
-    fs,
-    hash::Hasher,
-    path::{Path, PathBuf},
-};
-
-use fuser::INodeNo;
-use twox_hash::XxHash64;
-
-use crate::db::entities::Model;
-use crate::item::{FileType, Item};
-use crate::origins::attrs::FileAttrs;
-
-pub fn virtual_inode(path: &str) -> INodeNo {
-    let mut hasher = XxHash64::with_seed(5678);
-    hasher.write(path.as_bytes());
-
-    return INodeNo(hasher.finish() | (1u64 << 63));
-}
-
-pub fn parent_inode_from_path(local_path: &Path) -> INodeNo {
-    let components: Vec<_> = local_path
-        .components()
-        .filter(|c| matches!(c, std::path::Component::Normal(_)))
-        .collect();
-    if components.len() <= 1 {
-        return INodeNo::ROOT;
-    }
-    let mut parent_path = String::new();
-    for (i, comp) in components[..components.len() - 1].iter().enumerate() {
-        if i > 0 {
-            parent_path.push('/');
-        }
-        parent_path.push_str(comp.as_os_str().to_str().unwrap_or_default());
-    }
-
-    return virtual_inode(&parent_path);
-}
-
-pub fn ensure_virtual_dirs(
-    local_path: &Path,
-    source: &Path,
-    map: &mut BTreeMap<INodeNo, Item>,
-) -> INodeNo {
-    let components: Vec<_> = local_path
-        .components()
-        .filter(|c| matches!(c, std::path::Component::Normal(_)))
-        .collect();
-
-    if components.len() <= 1 {
-        return INodeNo::ROOT;
-    }
-
-    let mut current_parent = INodeNo::ROOT;
-    let mut current_path = String::new();
-
-    for component in &components[..components.len() - 1] {
-        let comp_str = component.as_os_str().to_str().unwrap_or_default();
-        if !current_path.is_empty() {
-            current_path.push('/');
-        }
-        current_path.push_str(comp_str);
-
-        let virt_ino = virtual_inode(&current_path);
-
-        if !map.contains_key(&virt_ino) {
-            let virt_item = Item::new(
-                virt_ino,
-                current_parent,
-                comp_str.to_string(),
-                source.to_path_buf(),
-                PathBuf::from(&current_path),
-                FileType::Directory,
-                FileAttrs::from(&fs::metadata(source).unwrap()),
-                None,
-            );
-            map.insert(virt_ino, virt_item);
-        }
-
-        current_parent = virt_ino;
-    }
-
-    return current_parent;
-}
-
-pub fn restore_virtual_paths(
-    snapshot: &mut BTreeMap<INodeNo, Item>,
-    db_items: &std::collections::HashMap<i64, Model>,
-    source: &Path,
-) {
-    let restorations: Vec<(INodeNo, String, PathBuf)> = db_items
-        .values()
-        .filter_map(|db_item| {
-            let ino = INodeNo(db_item.inode as u64);
-            if ino == INodeNo::ROOT {
-                return None;
-            }
-            snapshot
-                .get(&ino)
-                .filter(|item| item.hash as i64 == db_item.hash)
-                .map(|_| {
-                    (
-                        ino,
-                        db_item.name.clone(),
-                        PathBuf::from(&db_item.local_path),
-                    )
-                })
-        })
-        .collect();
-
-    for (_, _, local_path) in &restorations {
-        ensure_virtual_dirs(local_path, source, snapshot);
-    }
-    for (ino, name, local_path) in restorations {
-        if let Some(item) = snapshot.get_mut(&ino) {
-            item.name = name;
-            item.parent_inode = parent_inode_from_path(&local_path);
-            item.local_path = local_path;
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use std::collections::HashMap;
-
-    #[test]
-    fn virtual_inode_deterministic() {
-        let ino1 = virtual_inode("foo");
-        let ino2 = virtual_inode("foo");
-        assert_eq!(ino1, ino2);
-    }
-
-    #[test]
-    fn virtual_inode_high_bit_set() {
-        let ino = virtual_inode("test");
-        assert_eq!(ino.0 & (1u64 << 63), 1u64 << 63);
-    }
-
-    #[test]
-    fn virtual_inode_different_inputs() {
-        let ino1 = virtual_inode("foo");
-        let ino2 = virtual_inode("bar");
-        assert_ne!(ino1, ino2);
-    }
-
-    #[test]
-    fn parent_inode_single_component() {
-        let ino = parent_inode_from_path(Path::new("file.txt"));
-        assert_eq!(ino, INodeNo::ROOT);
-    }
-
-    #[test]
-    fn parent_inode_multi_component() {
-        let ino = parent_inode_from_path(Path::new("a/b/c"));
-        let expected = virtual_inode("a/b");
-        assert_eq!(ino, expected);
-    }
-
-    #[test]
-    fn parent_inode_absolute_path_filtered() {
-        let ino = parent_inode_from_path(Path::new("/file"));
-        assert_eq!(ino, INodeNo::ROOT);
-    }
-
-    #[test]
-    fn ensure_virtual_dirs_single_component() {
-        let tmp = tempfile::tempdir().unwrap();
-        let source = tmp.path();
-        let mut map = BTreeMap::new();
-
-        let ino = ensure_virtual_dirs(Path::new("file.txt"), source, &mut map);
-        assert_eq!(ino, INodeNo::ROOT);
-        assert!(map.is_empty());
-    }
-
-    #[test]
-    fn ensure_virtual_dirs_creates_hierarchy() {
-        let tmp = tempfile::tempdir().unwrap();
-        let source = tmp.path();
-        let mut map = BTreeMap::new();
-
-        let ino = ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
-
-        let a_ino = virtual_inode("a");
-        let ab_ino = virtual_inode("a/b");
-
-        assert_eq!(ino, ab_ino);
-        assert_eq!(map.len(), 2);
-        assert!(map.contains_key(&a_ino));
-        assert!(map.contains_key(&ab_ino));
-
-        let a_item = &map[&a_ino];
-        assert_eq!(a_item.parent_inode, INodeNo::ROOT);
-
-        let ab_item = &map[&ab_ino];
-        assert_eq!(ab_item.parent_inode, a_ino);
-    }
-
-    #[test]
-    fn ensure_virtual_dirs_idempotent() {
-        let tmp = tempfile::tempdir().unwrap();
-        let source = tmp.path();
-        let mut map = BTreeMap::new();
-
-        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
-        let size_after_first = map.len();
-
-        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
-        let size_after_second = map.len();
-
-        assert_eq!(size_after_first, size_after_second);
-    }
-
-    #[test]
-    fn restore_virtual_paths_skips_root() {
-        let tmp = tempfile::tempdir().unwrap();
-        let source = tmp.path();
-        let mut snapshot = BTreeMap::new();
-
-        let real_ino = INodeNo(42);
-        let real_item = Item::new(
-            real_ino,
-            INodeNo::ROOT,
-            "real_file".to_string(),
-            source.to_path_buf(),
-            PathBuf::from("real_file"),
-            FileType::File,
-            FileAttrs::from(&fs::metadata(source).unwrap()),
-            None,
-        );
-        snapshot.insert(real_ino, real_item);
-
-        let mut db_items = HashMap::new();
-        db_items.insert(
-            1i64,
-            Model {
-                inode: 1,
-                hash: 0,
-                name: "root".to_string(),
-                original_path: "/tmp/test".to_string(),
-                local_path: "/tmp/test".to_string(),
-                file_type: "directory".to_string(),
-            },
-        );
-        db_items.insert(
-            42i64,
-            Model {
-                inode: 42,
-                hash: 0,
-                name: "real_file".to_string(),
-                original_path: "real_file".to_string(),
-                local_path: "real_file".to_string(),
-                file_type: "file".to_string(),
-            },
-        );
-
-        restore_virtual_paths(&mut snapshot, &db_items, source);
-
-        for item in snapshot.values() {
-            assert_ne!(item.name, "/");
-            assert_ne!(item.name, "tmp");
-        }
-    }
-}