mirror of
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107 lines
3.3 KiB
Go
107 lines
3.3 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package global // import "go.opentelemetry.io/otel/internal/global"
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import (
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/otel/propagation"
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"go.opentelemetry.io/otel/trace"
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)
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type (
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tracerProviderHolder struct {
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tp trace.TracerProvider
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}
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propagatorsHolder struct {
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tm propagation.TextMapPropagator
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}
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)
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var (
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globalTracer = defaultTracerValue()
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globalPropagators = defaultPropagatorsValue()
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delegateTraceOnce sync.Once
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delegateTextMapPropagatorOnce sync.Once
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)
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// TracerProvider is the internal implementation for global.TracerProvider.
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func TracerProvider() trace.TracerProvider {
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return globalTracer.Load().(tracerProviderHolder).tp
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}
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// SetTracerProvider is the internal implementation for global.SetTracerProvider.
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func SetTracerProvider(tp trace.TracerProvider) {
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delegateTraceOnce.Do(func() {
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current := TracerProvider()
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if current == tp {
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// Setting the provider to the prior default is nonsense, panic.
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// Panic is acceptable because we are likely still early in the
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// process lifetime.
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panic("invalid TracerProvider, the global instance cannot be reinstalled")
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} else if def, ok := current.(*tracerProvider); ok {
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def.setDelegate(tp)
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}
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})
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globalTracer.Store(tracerProviderHolder{tp: tp})
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}
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// TextMapPropagator is the internal implementation for global.TextMapPropagator.
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func TextMapPropagator() propagation.TextMapPropagator {
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return globalPropagators.Load().(propagatorsHolder).tm
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}
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// SetTextMapPropagator is the internal implementation for global.SetTextMapPropagator.
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func SetTextMapPropagator(p propagation.TextMapPropagator) {
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// For the textMapPropagator already returned by TextMapPropagator
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// delegate to p.
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delegateTextMapPropagatorOnce.Do(func() {
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if current := TextMapPropagator(); current == p {
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// Setting the provider to the prior default is nonsense, panic.
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// Panic is acceptable because we are likely still early in the
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// process lifetime.
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panic("invalid TextMapPropagator, the global instance cannot be reinstalled")
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} else if def, ok := current.(*textMapPropagator); ok {
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def.SetDelegate(p)
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}
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})
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// Return p when subsequent calls to TextMapPropagator are made.
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globalPropagators.Store(propagatorsHolder{tm: p})
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}
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func defaultTracerValue() *atomic.Value {
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v := &atomic.Value{}
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v.Store(tracerProviderHolder{tp: &tracerProvider{}})
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return v
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}
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func defaultPropagatorsValue() *atomic.Value {
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v := &atomic.Value{}
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v.Store(propagatorsHolder{tm: newTextMapPropagator()})
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return v
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}
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// ResetForTest restores the initial global state, for testing purposes.
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func ResetForTest() {
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globalTracer = defaultTracerValue()
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globalPropagators = defaultPropagatorsValue()
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delegateTraceOnce = sync.Once{}
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delegateTextMapPropagatorOnce = sync.Once{}
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}
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