diff options
Diffstat (limited to 'vendor/go.opentelemetry.io/otel/internal/global/trace.go')
| -rw-r--r-- | vendor/go.opentelemetry.io/otel/internal/global/trace.go | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/vendor/go.opentelemetry.io/otel/internal/global/trace.go b/vendor/go.opentelemetry.io/otel/internal/global/trace.go deleted file mode 100644 index 8982aa0dc..000000000 --- a/vendor/go.opentelemetry.io/otel/internal/global/trace.go +++ /dev/null @@ -1,220 +0,0 @@ -// Copyright The OpenTelemetry Authors -// SPDX-License-Identifier: Apache-2.0 - -package global // import "go.opentelemetry.io/otel/internal/global" - -/* -This file contains the forwarding implementation of the TracerProvider used as -the default global instance. Prior to initialization of an SDK, Tracers -returned by the global TracerProvider will provide no-op functionality. This -means that all Span created prior to initialization are no-op Spans. - -Once an SDK has been initialized, all provided no-op Tracers are swapped for -Tracers provided by the SDK defined TracerProvider. However, any Span started -prior to this initialization does not change its behavior. Meaning, the Span -remains a no-op Span. - -The implementation to track and swap Tracers locks all new Tracer creation -until the swap is complete. This assumes that this operation is not -performance-critical. If that assumption is incorrect, be sure to configure an -SDK prior to any Tracer creation. -*/ - -import ( - "context" - "sync" - "sync/atomic" - - "go.opentelemetry.io/auto/sdk" - "go.opentelemetry.io/otel/attribute" - "go.opentelemetry.io/otel/codes" - "go.opentelemetry.io/otel/trace" - "go.opentelemetry.io/otel/trace/embedded" -) - -// tracerProvider is a placeholder for a configured SDK TracerProvider. -// -// All TracerProvider functionality is forwarded to a delegate once -// configured. -type tracerProvider struct { - embedded.TracerProvider - - mtx sync.Mutex - tracers map[il]*tracer - delegate trace.TracerProvider -} - -// Compile-time guarantee that tracerProvider implements the TracerProvider -// interface. -var _ trace.TracerProvider = &tracerProvider{} - -// setDelegate configures p to delegate all TracerProvider functionality to -// provider. -// -// All Tracers provided prior to this function call are switched out to be -// Tracers provided by provider. -// -// It is guaranteed by the caller that this happens only once. -func (p *tracerProvider) setDelegate(provider trace.TracerProvider) { - p.mtx.Lock() - defer p.mtx.Unlock() - - p.delegate = provider - - if len(p.tracers) == 0 { - return - } - - for _, t := range p.tracers { - t.setDelegate(provider) - } - - p.tracers = nil -} - -// Tracer implements TracerProvider. -func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.Tracer { - p.mtx.Lock() - defer p.mtx.Unlock() - - if p.delegate != nil { - return p.delegate.Tracer(name, opts...) - } - - // At this moment it is guaranteed that no sdk is installed, save the tracer in the tracers map. - - c := trace.NewTracerConfig(opts...) - key := il{ - name: name, - version: c.InstrumentationVersion(), - schema: c.SchemaURL(), - attrs: c.InstrumentationAttributes(), - } - - if p.tracers == nil { - p.tracers = make(map[il]*tracer) - } - - if val, ok := p.tracers[key]; ok { - return val - } - - t := &tracer{name: name, opts: opts, provider: p} - p.tracers[key] = t - return t -} - -type il struct { - name string - version string - schema string - attrs attribute.Set -} - -// tracer is a placeholder for a trace.Tracer. -// -// All Tracer functionality is forwarded to a delegate once configured. -// Otherwise, all functionality is forwarded to a NoopTracer. -type tracer struct { - embedded.Tracer - - name string - opts []trace.TracerOption - provider *tracerProvider - - delegate atomic.Value -} - -// Compile-time guarantee that tracer implements the trace.Tracer interface. -var _ trace.Tracer = &tracer{} - -// setDelegate configures t to delegate all Tracer functionality to Tracers -// created by provider. -// -// All subsequent calls to the Tracer methods will be passed to the delegate. -// -// It is guaranteed by the caller that this happens only once. -func (t *tracer) setDelegate(provider trace.TracerProvider) { - t.delegate.Store(provider.Tracer(t.name, t.opts...)) -} - -// Start implements trace.Tracer by forwarding the call to t.delegate if -// set, otherwise it forwards the call to a NoopTracer. -func (t *tracer) Start(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) { - delegate := t.delegate.Load() - if delegate != nil { - return delegate.(trace.Tracer).Start(ctx, name, opts...) - } - - return t.newSpan(ctx, autoInstEnabled, name, opts) -} - -// autoInstEnabled determines if the auto-instrumentation SDK span is returned -// from the tracer when not backed by a delegate and auto-instrumentation has -// attached to this process. -// -// The auto-instrumentation is expected to overwrite this value to true when it -// attaches. By default, this will point to false and mean a tracer will return -// a nonRecordingSpan by default. -var autoInstEnabled = new(bool) - -func (t *tracer) newSpan(ctx context.Context, autoSpan *bool, name string, opts []trace.SpanStartOption) (context.Context, trace.Span) { - // autoInstEnabled is passed to newSpan via the autoSpan parameter. This is - // so the auto-instrumentation can define a uprobe for (*t).newSpan and be - // provided with the address of the bool autoInstEnabled points to. It - // needs to be a parameter so that pointer can be reliably determined, it - // should not be read from the global. - - if *autoSpan { - tracer := sdk.TracerProvider().Tracer(t.name, t.opts...) - return tracer.Start(ctx, name, opts...) - } - - s := nonRecordingSpan{sc: trace.SpanContextFromContext(ctx), tracer: t} - ctx = trace.ContextWithSpan(ctx, s) - return ctx, s -} - -// nonRecordingSpan is a minimal implementation of a Span that wraps a -// SpanContext. It performs no operations other than to return the wrapped -// SpanContext. -type nonRecordingSpan struct { - embedded.Span - - sc trace.SpanContext - tracer *tracer -} - -var _ trace.Span = nonRecordingSpan{} - -// SpanContext returns the wrapped SpanContext. -func (s nonRecordingSpan) SpanContext() trace.SpanContext { return s.sc } - -// IsRecording always returns false. -func (nonRecordingSpan) IsRecording() bool { return false } - -// SetStatus does nothing. -func (nonRecordingSpan) SetStatus(codes.Code, string) {} - -// SetError does nothing. -func (nonRecordingSpan) SetError(bool) {} - -// SetAttributes does nothing. -func (nonRecordingSpan) SetAttributes(...attribute.KeyValue) {} - -// End does nothing. -func (nonRecordingSpan) End(...trace.SpanEndOption) {} - -// RecordError does nothing. -func (nonRecordingSpan) RecordError(error, ...trace.EventOption) {} - -// AddEvent does nothing. -func (nonRecordingSpan) AddEvent(string, ...trace.EventOption) {} - -// AddLink does nothing. -func (nonRecordingSpan) AddLink(trace.Link) {} - -// SetName does nothing. -func (nonRecordingSpan) SetName(string) {} - -func (s nonRecordingSpan) TracerProvider() trace.TracerProvider { return s.tracer.provider } |