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Synced Nov 11, 01:00 UTC
| 1 | package tracing |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "sync" |
| 7 | |
| 8 | sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| 9 | "go.uber.org/zap" |
| 10 | "go.uber.org/zap/zapcore" |
| 11 | ) |
| 12 | |
| 13 | // globalTracerProvider stores global tracer provider and is responsible for graceful shutdown when nobody is using it. |
| 14 | var globalTracerProvider = &tracerProvider{} |
| 15 | |
| 16 | type tracerProvider struct { |
| 17 | mu sync.Mutex |
| 18 | tracerProvider *sdktrace.TracerProvider |
| 19 | tracerProvidersCounter int |
| 20 | } |
| 21 | |
| 22 | // getTracerProvider create or return an existing global TracerProvider. |
| 23 | // |
| 24 | // buildOpts is only invoked when a new provider must actually be created. |
| 25 | // This matters because some options (notably sdktrace.WithBatcher) eagerly |
| 26 | // start background goroutines when constructed. Building them unconditionally |
| 27 | // and then discarding them on the reuse path would leak a BatchSpanProcessor |
| 28 | // goroutine on every config reload. |
| 29 | func (t *tracerProvider) getTracerProvider(buildOpts func() ([]sdktrace.TracerProviderOption, error)) (*sdktrace.TracerProvider, error) { |
| 30 | t.mu.Lock() |
| 31 | defer t.mu.Unlock() |
| 32 | |
| 33 | if t.tracerProvider == nil { |
| 34 | opts, err := buildOpts() |
| 35 | if err != nil { |
| 36 | return nil, err |
| 37 | } |
| 38 | t.tracerProvider = sdktrace.NewTracerProvider( |
| 39 | opts..., |
| 40 | ) |
| 41 | } |
| 42 | |
| 43 | t.tracerProvidersCounter++ |
| 44 | |
| 45 | return t.tracerProvider, nil |
| 46 | } |
| 47 | |
| 48 | // cleanupTracerProvider gracefully shutdown a TracerProvider |
| 49 | func (t *tracerProvider) cleanupTracerProvider(logger *zap.Logger) error { |
| 50 | t.mu.Lock() |
| 51 | defer t.mu.Unlock() |
| 52 | |
| 53 | if t.tracerProvidersCounter > 0 { |
| 54 | t.tracerProvidersCounter-- |
| 55 | } |
| 56 | |
| 57 | if t.tracerProvidersCounter == 0 { |
| 58 | if t.tracerProvider != nil { |
| 59 | // tracerProvider.ForceFlush SHOULD be invoked according to https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#forceflush |
| 60 | if err := t.tracerProvider.ForceFlush(context.Background()); err != nil { |
| 61 | if c := logger.Check(zapcore.ErrorLevel, "forcing flush"); c != nil { |
| 62 | c.Write(zap.Error(err)) |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | // tracerProvider.Shutdown MUST be invoked according to https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#shutdown |
| 67 | if err := t.tracerProvider.Shutdown(context.Background()); err != nil { |
| 68 | return fmt.Errorf("tracerProvider shutdown error: %w", err) |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | t.tracerProvider = nil |
| 73 | } |
| 74 | |
| 75 | return nil |
| 76 | } |