2023-05-09 17:19:48 +00:00
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// Copyright The OpenTelemetry Authors
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2024-04-11 09:46:18 +00:00
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// SPDX-License-Identifier: Apache-2.0
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2023-05-09 17:19:48 +00:00
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package trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/internal/global"
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"go.opentelemetry.io/otel/sdk/instrumentation"
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"go.opentelemetry.io/otel/sdk/resource"
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"go.opentelemetry.io/otel/trace"
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2023-11-13 10:08:02 +00:00
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"go.opentelemetry.io/otel/trace/embedded"
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"go.opentelemetry.io/otel/trace/noop"
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2023-05-09 17:19:48 +00:00
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)
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const (
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defaultTracerName = "go.opentelemetry.io/otel/sdk/tracer"
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)
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// tracerProviderConfig.
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type tracerProviderConfig struct {
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// processors contains collection of SpanProcessors that are processing pipeline
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// for spans in the trace signal.
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// SpanProcessors registered with a TracerProvider and are called at the start
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// and end of a Span's lifecycle, and are called in the order they are
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// registered.
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processors []SpanProcessor
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// sampler is the default sampler used when creating new spans.
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sampler Sampler
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// idGenerator is used to generate all Span and Trace IDs when needed.
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idGenerator IDGenerator
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// spanLimits defines the attribute, event, and link limits for spans.
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spanLimits SpanLimits
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// resource contains attributes representing an entity that produces telemetry.
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resource *resource.Resource
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}
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2024-03-11 14:34:34 +00:00
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// MarshalLog is the marshaling function used by the logging system to represent this Provider.
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func (cfg tracerProviderConfig) MarshalLog() interface{} {
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return struct {
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SpanProcessors []SpanProcessor
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SamplerType string
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IDGeneratorType string
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SpanLimits SpanLimits
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Resource *resource.Resource
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}{
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SpanProcessors: cfg.processors,
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SamplerType: fmt.Sprintf("%T", cfg.sampler),
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IDGeneratorType: fmt.Sprintf("%T", cfg.idGenerator),
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SpanLimits: cfg.spanLimits,
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Resource: cfg.resource,
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}
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}
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// TracerProvider is an OpenTelemetry TracerProvider. It provides Tracers to
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// instrumentation so it can trace operational flow through a system.
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type TracerProvider struct {
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embedded.TracerProvider
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mu sync.Mutex
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namedTracer map[instrumentation.Scope]*tracer
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spanProcessors atomic.Pointer[spanProcessorStates]
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isShutdown atomic.Bool
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// These fields are not protected by the lock mu. They are assumed to be
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// immutable after creation of the TracerProvider.
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sampler Sampler
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idGenerator IDGenerator
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spanLimits SpanLimits
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resource *resource.Resource
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}
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var _ trace.TracerProvider = &TracerProvider{}
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// NewTracerProvider returns a new and configured TracerProvider.
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//
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// By default the returned TracerProvider is configured with:
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// - a ParentBased(AlwaysSample) Sampler
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// - a random number IDGenerator
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// - the resource.Default() Resource
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// - the default SpanLimits.
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//
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// The passed opts are used to override these default values and configure the
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// returned TracerProvider appropriately.
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func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
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o := tracerProviderConfig{
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spanLimits: NewSpanLimits(),
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}
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o = applyTracerProviderEnvConfigs(o)
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for _, opt := range opts {
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o = opt.apply(o)
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}
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o = ensureValidTracerProviderConfig(o)
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tp := &TracerProvider{
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namedTracer: make(map[instrumentation.Scope]*tracer),
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sampler: o.sampler,
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idGenerator: o.idGenerator,
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spanLimits: o.spanLimits,
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resource: o.resource,
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}
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global.Info("TracerProvider created", "config", o)
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spss := make(spanProcessorStates, 0, len(o.processors))
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for _, sp := range o.processors {
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spss = append(spss, newSpanProcessorState(sp))
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}
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tp.spanProcessors.Store(&spss)
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return tp
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}
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// Tracer returns a Tracer with the given name and options. If a Tracer for
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// the given name and options does not exist it is created, otherwise the
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// existing Tracer is returned.
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//
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// If name is empty, DefaultTracerName is used instead.
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//
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// This method is safe to be called concurrently.
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func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.Tracer {
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// This check happens before the mutex is acquired to avoid deadlocking if Tracer() is called from within Shutdown().
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if p.isShutdown.Load() {
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return noop.NewTracerProvider().Tracer(name, opts...)
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}
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c := trace.NewTracerConfig(opts...)
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if name == "" {
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name = defaultTracerName
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}
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is := instrumentation.Scope{
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Name: name,
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Version: c.InstrumentationVersion(),
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SchemaURL: c.SchemaURL(),
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}
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t, ok := func() (trace.Tracer, bool) {
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p.mu.Lock()
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defer p.mu.Unlock()
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// Must check the flag after acquiring the mutex to avoid returning a valid tracer if Shutdown() ran
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// after the first check above but before we acquired the mutex.
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if p.isShutdown.Load() {
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return noop.NewTracerProvider().Tracer(name, opts...), true
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}
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t, ok := p.namedTracer[is]
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if !ok {
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t = &tracer{
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provider: p,
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instrumentationScope: is,
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}
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p.namedTracer[is] = t
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}
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return t, ok
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}()
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if !ok {
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// This code is outside the mutex to not hold the lock while calling third party logging code:
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// - That code may do slow things like I/O, which would prolong the duration the lock is held,
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// slowing down all tracing consumers.
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// - Logging code may be instrumented with tracing and deadlock because it could try
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// acquiring the same non-reentrant mutex.
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global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL)
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}
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return t
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}
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// RegisterSpanProcessor adds the given SpanProcessor to the list of SpanProcessors.
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func (p *TracerProvider) RegisterSpanProcessor(sp SpanProcessor) {
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// This check prevents calls during a shutdown.
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if p.isShutdown.Load() {
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return
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}
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p.mu.Lock()
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defer p.mu.Unlock()
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// This check prevents calls after a shutdown.
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if p.isShutdown.Load() {
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return
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}
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current := p.getSpanProcessors()
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newSPS := make(spanProcessorStates, 0, len(current)+1)
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newSPS = append(newSPS, current...)
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newSPS = append(newSPS, newSpanProcessorState(sp))
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p.spanProcessors.Store(&newSPS)
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}
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// UnregisterSpanProcessor removes the given SpanProcessor from the list of SpanProcessors.
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func (p *TracerProvider) UnregisterSpanProcessor(sp SpanProcessor) {
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// This check prevents calls during a shutdown.
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if p.isShutdown.Load() {
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return
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}
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p.mu.Lock()
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defer p.mu.Unlock()
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// This check prevents calls after a shutdown.
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if p.isShutdown.Load() {
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return
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}
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old := p.getSpanProcessors()
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if len(old) == 0 {
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return
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}
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spss := make(spanProcessorStates, len(old))
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copy(spss, old)
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// stop the span processor if it is started and remove it from the list
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var stopOnce *spanProcessorState
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var idx int
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for i, sps := range spss {
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if sps.sp == sp {
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stopOnce = sps
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idx = i
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}
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}
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if stopOnce != nil {
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stopOnce.state.Do(func() {
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if err := sp.Shutdown(context.Background()); err != nil {
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otel.Handle(err)
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}
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})
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}
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if len(spss) > 1 {
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copy(spss[idx:], spss[idx+1:])
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}
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spss[len(spss)-1] = nil
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spss = spss[:len(spss)-1]
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p.spanProcessors.Store(&spss)
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}
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// ForceFlush immediately exports all spans that have not yet been exported for
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// all the registered span processors.
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func (p *TracerProvider) ForceFlush(ctx context.Context) error {
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spss := p.getSpanProcessors()
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if len(spss) == 0 {
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return nil
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}
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for _, sps := range spss {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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if err := sps.sp.ForceFlush(ctx); err != nil {
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return err
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}
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}
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return nil
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}
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// Shutdown shuts down TracerProvider. All registered span processors are shut down
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// in the order they were registered and any held computational resources are released.
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// After Shutdown is called, all methods are no-ops.
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func (p *TracerProvider) Shutdown(ctx context.Context) error {
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// This check prevents deadlocks in case of recursive shutdown.
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if p.isShutdown.Load() {
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return nil
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}
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p.mu.Lock()
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defer p.mu.Unlock()
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// This check prevents calls after a shutdown has already been done concurrently.
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if !p.isShutdown.CompareAndSwap(false, true) { // did toggle?
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return nil
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}
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var retErr error
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for _, sps := range p.getSpanProcessors() {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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var err error
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sps.state.Do(func() {
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err = sps.sp.Shutdown(ctx)
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})
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if err != nil {
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if retErr == nil {
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retErr = err
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} else {
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// Poor man's list of errors
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retErr = fmt.Errorf("%v; %v", retErr, err)
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}
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}
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}
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p.spanProcessors.Store(&spanProcessorStates{})
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return retErr
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}
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func (p *TracerProvider) getSpanProcessors() spanProcessorStates {
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return *(p.spanProcessors.Load())
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}
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// TracerProviderOption configures a TracerProvider.
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type TracerProviderOption interface {
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apply(tracerProviderConfig) tracerProviderConfig
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}
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type traceProviderOptionFunc func(tracerProviderConfig) tracerProviderConfig
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func (fn traceProviderOptionFunc) apply(cfg tracerProviderConfig) tracerProviderConfig {
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return fn(cfg)
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}
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// WithSyncer registers the exporter with the TracerProvider using a
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// SimpleSpanProcessor.
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//
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// This is not recommended for production use. The synchronous nature of the
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// SimpleSpanProcessor that will wrap the exporter make it good for testing,
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// debugging, or showing examples of other feature, but it will be slow and
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// have a high computation resource usage overhead. The WithBatcher option is
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// recommended for production use instead.
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func WithSyncer(e SpanExporter) TracerProviderOption {
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return WithSpanProcessor(NewSimpleSpanProcessor(e))
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}
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// WithBatcher registers the exporter with the TracerProvider using a
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// BatchSpanProcessor configured with the passed opts.
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func WithBatcher(e SpanExporter, opts ...BatchSpanProcessorOption) TracerProviderOption {
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return WithSpanProcessor(NewBatchSpanProcessor(e, opts...))
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}
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// WithSpanProcessor registers the SpanProcessor with a TracerProvider.
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func WithSpanProcessor(sp SpanProcessor) TracerProviderOption {
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return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
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cfg.processors = append(cfg.processors, sp)
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return cfg
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})
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|
|
|
}
|
|
|
|
|
|
|
|
// WithResource returns a TracerProviderOption that will configure the
|
|
|
|
// Resource r as a TracerProvider's Resource. The configured Resource is
|
|
|
|
// referenced by all the Tracers the TracerProvider creates. It represents the
|
|
|
|
// entity producing telemetry.
|
|
|
|
//
|
|
|
|
// If this option is not used, the TracerProvider will use the
|
|
|
|
// resource.Default() Resource by default.
|
|
|
|
func WithResource(r *resource.Resource) TracerProviderOption {
|
|
|
|
return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
var err error
|
|
|
|
cfg.resource, err = resource.Merge(resource.Environment(), r)
|
|
|
|
if err != nil {
|
|
|
|
otel.Handle(err)
|
|
|
|
}
|
|
|
|
return cfg
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
// WithIDGenerator returns a TracerProviderOption that will configure the
|
|
|
|
// IDGenerator g as a TracerProvider's IDGenerator. The configured IDGenerator
|
|
|
|
// is used by the Tracers the TracerProvider creates to generate new Span and
|
|
|
|
// Trace IDs.
|
|
|
|
//
|
|
|
|
// If this option is not used, the TracerProvider will use a random number
|
|
|
|
// IDGenerator by default.
|
|
|
|
func WithIDGenerator(g IDGenerator) TracerProviderOption {
|
|
|
|
return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
if g != nil {
|
|
|
|
cfg.idGenerator = g
|
|
|
|
}
|
|
|
|
return cfg
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
// WithSampler returns a TracerProviderOption that will configure the Sampler
|
|
|
|
// s as a TracerProvider's Sampler. The configured Sampler is used by the
|
|
|
|
// Tracers the TracerProvider creates to make their sampling decisions for the
|
|
|
|
// Spans they create.
|
|
|
|
//
|
|
|
|
// This option overrides the Sampler configured through the OTEL_TRACES_SAMPLER
|
|
|
|
// and OTEL_TRACES_SAMPLER_ARG environment variables. If this option is not used
|
|
|
|
// and the sampler is not configured through environment variables or the environment
|
|
|
|
// contains invalid/unsupported configuration, the TracerProvider will use a
|
|
|
|
// ParentBased(AlwaysSample) Sampler by default.
|
|
|
|
func WithSampler(s Sampler) TracerProviderOption {
|
|
|
|
return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
if s != nil {
|
|
|
|
cfg.sampler = s
|
|
|
|
}
|
|
|
|
return cfg
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
// WithSpanLimits returns a TracerProviderOption that configures a
|
|
|
|
// TracerProvider to use the SpanLimits sl. These SpanLimits bound any Span
|
|
|
|
// created by a Tracer from the TracerProvider.
|
|
|
|
//
|
|
|
|
// If any field of sl is zero or negative it will be replaced with the default
|
|
|
|
// value for that field.
|
|
|
|
//
|
|
|
|
// If this or WithRawSpanLimits are not provided, the TracerProvider will use
|
|
|
|
// the limits defined by environment variables, or the defaults if unset.
|
|
|
|
// Refer to the NewSpanLimits documentation for information about this
|
|
|
|
// relationship.
|
|
|
|
//
|
|
|
|
// Deprecated: Use WithRawSpanLimits instead which allows setting unlimited
|
|
|
|
// and zero limits. This option will be kept until the next major version
|
|
|
|
// incremented release.
|
|
|
|
func WithSpanLimits(sl SpanLimits) TracerProviderOption {
|
|
|
|
if sl.AttributeValueLengthLimit <= 0 {
|
|
|
|
sl.AttributeValueLengthLimit = DefaultAttributeValueLengthLimit
|
|
|
|
}
|
|
|
|
if sl.AttributeCountLimit <= 0 {
|
|
|
|
sl.AttributeCountLimit = DefaultAttributeCountLimit
|
|
|
|
}
|
|
|
|
if sl.EventCountLimit <= 0 {
|
|
|
|
sl.EventCountLimit = DefaultEventCountLimit
|
|
|
|
}
|
|
|
|
if sl.AttributePerEventCountLimit <= 0 {
|
|
|
|
sl.AttributePerEventCountLimit = DefaultAttributePerEventCountLimit
|
|
|
|
}
|
|
|
|
if sl.LinkCountLimit <= 0 {
|
|
|
|
sl.LinkCountLimit = DefaultLinkCountLimit
|
|
|
|
}
|
|
|
|
if sl.AttributePerLinkCountLimit <= 0 {
|
|
|
|
sl.AttributePerLinkCountLimit = DefaultAttributePerLinkCountLimit
|
|
|
|
}
|
|
|
|
return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
cfg.spanLimits = sl
|
|
|
|
return cfg
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
// WithRawSpanLimits returns a TracerProviderOption that configures a
|
|
|
|
// TracerProvider to use these limits. These limits bound any Span created by
|
|
|
|
// a Tracer from the TracerProvider.
|
|
|
|
//
|
|
|
|
// The limits will be used as-is. Zero or negative values will not be changed
|
|
|
|
// to the default value like WithSpanLimits does. Setting a limit to zero will
|
|
|
|
// effectively disable the related resource it limits and setting to a
|
|
|
|
// negative value will mean that resource is unlimited. Consequentially, this
|
|
|
|
// means that the zero-value SpanLimits will disable all span resources.
|
|
|
|
// Because of this, limits should be constructed using NewSpanLimits and
|
|
|
|
// updated accordingly.
|
|
|
|
//
|
|
|
|
// If this or WithSpanLimits are not provided, the TracerProvider will use the
|
|
|
|
// limits defined by environment variables, or the defaults if unset. Refer to
|
|
|
|
// the NewSpanLimits documentation for information about this relationship.
|
|
|
|
func WithRawSpanLimits(limits SpanLimits) TracerProviderOption {
|
|
|
|
return traceProviderOptionFunc(func(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
cfg.spanLimits = limits
|
|
|
|
return cfg
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
func applyTracerProviderEnvConfigs(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
for _, opt := range tracerProviderOptionsFromEnv() {
|
|
|
|
cfg = opt.apply(cfg)
|
|
|
|
}
|
|
|
|
|
|
|
|
return cfg
|
|
|
|
}
|
|
|
|
|
|
|
|
func tracerProviderOptionsFromEnv() []TracerProviderOption {
|
|
|
|
var opts []TracerProviderOption
|
|
|
|
|
|
|
|
sampler, err := samplerFromEnv()
|
|
|
|
if err != nil {
|
|
|
|
otel.Handle(err)
|
|
|
|
}
|
|
|
|
|
|
|
|
if sampler != nil {
|
|
|
|
opts = append(opts, WithSampler(sampler))
|
|
|
|
}
|
|
|
|
|
|
|
|
return opts
|
|
|
|
}
|
|
|
|
|
|
|
|
// ensureValidTracerProviderConfig ensures that given TracerProviderConfig is valid.
|
|
|
|
func ensureValidTracerProviderConfig(cfg tracerProviderConfig) tracerProviderConfig {
|
|
|
|
if cfg.sampler == nil {
|
|
|
|
cfg.sampler = ParentBased(AlwaysSample())
|
|
|
|
}
|
|
|
|
if cfg.idGenerator == nil {
|
|
|
|
cfg.idGenerator = defaultIDGenerator()
|
|
|
|
}
|
|
|
|
if cfg.resource == nil {
|
|
|
|
cfg.resource = resource.Default()
|
|
|
|
}
|
|
|
|
return cfg
|
|
|
|
}
|