fix(nix): update vendorHash and vendor dir for new deps

vendor/go.mongodb.org/mongo-driver/v2/bson/pointer_codec.go

@@ -0,0 +1,88 @@
+// Copyright (C) MongoDB, Inc. 2017-present.
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License. You may obtain
+// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+
+package bson
+
+import (
+	"reflect"
+)
+
+var (
+	_ ValueEncoder = &pointerCodec{}
+	_ ValueDecoder = &pointerCodec{}
+)
+
+// pointerCodec is the Codec used for pointers.
+type pointerCodec struct {
+	ecache typeEncoderCache
+	dcache typeDecoderCache
+}
+
+// EncodeValue handles encoding a pointer by either encoding it to BSON Null if the pointer is nil
+// or looking up an encoder for the type of value the pointer points to.
+func (pc *pointerCodec) EncodeValue(ec EncodeContext, vw ValueWriter, val reflect.Value) error {
+	if val.Kind() != reflect.Ptr {
+		if !val.IsValid() {
+			return vw.WriteNull()
+		}
+		return ValueEncoderError{Name: "PointerCodec.EncodeValue", Kinds: []reflect.Kind{reflect.Ptr}, Received: val}
+	}
+
+	if val.IsNil() {
+		return vw.WriteNull()
+	}
+
+	typ := val.Type()
+	if v, ok := pc.ecache.Load(typ); ok {
+		if v == nil {
+			return errNoEncoder{Type: typ}
+		}
+		return v.EncodeValue(ec, vw, val.Elem())
+	}
+	// TODO(charlie): handle concurrent requests for the same type
+	enc, err := ec.LookupEncoder(typ.Elem())
+	enc = pc.ecache.LoadOrStore(typ, enc)
+	if err != nil {
+		return err
+	}
+	return enc.EncodeValue(ec, vw, val.Elem())
+}
+
+// DecodeValue handles decoding a pointer by looking up a decoder for the type it points to and
+// using that to decode. If the BSON value is Null, this method will set the pointer to nil.
+func (pc *pointerCodec) DecodeValue(dc DecodeContext, vr ValueReader, val reflect.Value) error {
+	if !val.CanSet() || val.Kind() != reflect.Ptr {
+		return ValueDecoderError{Name: "PointerCodec.DecodeValue", Kinds: []reflect.Kind{reflect.Ptr}, Received: val}
+	}
+
+	typ := val.Type()
+	if vr.Type() == TypeNull {
+		val.Set(reflect.Zero(typ))
+		return vr.ReadNull()
+	}
+	if vr.Type() == TypeUndefined {
+		val.Set(reflect.Zero(typ))
+		return vr.ReadUndefined()
+	}
+
+	if val.IsNil() {
+		val.Set(reflect.New(typ.Elem()))
+	}
+
+	if v, ok := pc.dcache.Load(typ); ok {
+		if v == nil {
+			return errNoDecoder{Type: typ}
+		}
+		return v.DecodeValue(dc, vr, val.Elem())
+	}
+	// TODO(charlie): handle concurrent requests for the same type
+	dec, err := dc.LookupDecoder(typ.Elem())
+	dec = pc.dcache.LoadOrStore(typ, dec)
+	if err != nil {
+		return err
+	}
+	return dec.DecodeValue(dc, vr, val.Elem())
+}