Alexander
108 lines
3.2 KiB
Go
108 lines
3.2 KiB
Go
package telemetry
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import (
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"context"
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"io"
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"github.com/fujin/anthropic-proxy/internal/config"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
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"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
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"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
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otellog "go.opentelemetry.io/otel/log/global"
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"go.opentelemetry.io/otel/sdk/log"
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sdkmetric "go.opentelemetry.io/otel/sdk/metric"
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"go.opentelemetry.io/otel/sdk/resource"
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"go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
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)
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// Setup initializes OpenTelemetry providers. It always creates a MeterProvider
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// so metrics can be recorded in-process. When cfg.ExportEnabled(), OTLP gRPC
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// exporters are additionally configured to push to the LGTM stack.
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// Returns a shutdown function and an optional io.Writer for the log bridge.
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func Setup(ctx context.Context, cfg config.TelemetryConfig) (shutdown func(context.Context) error, logWriter io.Writer, err error) {
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res, err := resource.New(ctx,
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resource.WithAttributes(
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semconv.ServiceName(cfg.ServiceName),
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),
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)
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if err != nil {
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return nil, nil, err
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}
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if !cfg.ExportEnabled() {
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// No export — set up in-memory meter provider only so metric
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// instruments are valid (they just don't export anywhere).
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mp := sdkmetric.NewMeterProvider(sdkmetric.WithResource(res))
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otel.SetMeterProvider(mp)
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InitMetrics(mp.Meter(cfg.ServiceName))
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return func(ctx context.Context) error { return mp.Shutdown(ctx) }, nil, nil
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}
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// Build exporter options
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traceOpts := []otlptracegrpc.Option{otlptracegrpc.WithEndpoint(cfg.Endpoint)}
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metricOpts := []otlpmetricgrpc.Option{
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otlpmetricgrpc.WithEndpoint(cfg.Endpoint),
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otlpmetricgrpc.WithTemporalitySelector(sdkmetric.CumulativeTemporalitySelector),
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}
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logOpts := []otlploggrpc.Option{otlploggrpc.WithEndpoint(cfg.Endpoint)}
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if cfg.Insecure {
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traceOpts = append(traceOpts, otlptracegrpc.WithInsecure())
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metricOpts = append(metricOpts, otlpmetricgrpc.WithInsecure())
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logOpts = append(logOpts, otlploggrpc.WithInsecure())
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}
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// Trace exporter
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traceExp, err := otlptracegrpc.New(ctx, traceOpts...)
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if err != nil {
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return nil, nil, err
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}
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tp := trace.NewTracerProvider(
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trace.WithBatcher(traceExp),
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trace.WithResource(res),
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)
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otel.SetTracerProvider(tp)
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// Metric exporter
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metricExp, err := otlpmetricgrpc.New(ctx, metricOpts...)
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if err != nil {
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return nil, nil, err
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}
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mp := sdkmetric.NewMeterProvider(
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sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExp)),
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sdkmetric.WithResource(res),
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)
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otel.SetMeterProvider(mp)
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InitMetrics(mp.Meter(cfg.ServiceName))
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// Log exporter
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logExp, err := otlploggrpc.New(ctx, logOpts...)
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if err != nil {
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return nil, nil, err
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}
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lp := log.NewLoggerProvider(
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log.WithProcessor(log.NewBatchProcessor(logExp)),
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log.WithResource(res),
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)
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otellog.SetLoggerProvider(lp)
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bridge := &LogBridge{provider: lp}
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shutdownFn := func(ctx context.Context) error {
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var firstErr error
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if e := tp.Shutdown(ctx); e != nil && firstErr == nil {
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firstErr = e
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}
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if e := mp.Shutdown(ctx); e != nil && firstErr == nil {
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firstErr = e
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}
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if e := lp.Shutdown(ctx); e != nil && firstErr == nil {
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firstErr = e
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}
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return firstErr
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}
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return shutdownFn, bridge, nil
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}
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