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https://github.com/open-telemetry/opentelemetry-go.git
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a485d0ec64
* Update License header for all source files - Add Apache 2.0 header to source files that did not have one. - Update all existing headers dated to 2019 to be 2020 - Remove comma from License header to comply with the Apache 2.0 guidelines. * Update Copyright notice Use the standard Copyright notices outlined by the [CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
141 lines
4.0 KiB
Go
141 lines
4.0 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 internal
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import (
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/otel/api/correlation"
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"go.opentelemetry.io/otel/api/metric"
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"go.opentelemetry.io/otel/api/propagation"
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"go.opentelemetry.io/otel/api/trace"
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)
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type (
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traceProviderHolder struct {
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tp trace.Provider
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}
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meterProviderHolder struct {
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mp metric.Provider
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}
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propagatorsHolder struct {
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pr propagation.Propagators
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}
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)
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var (
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globalTracer = defaultTracerValue()
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globalMeter = defaultMeterValue()
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globalPropagators = defaultPropagatorsValue()
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delegateMeterOnce sync.Once
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delegateTraceOnce sync.Once
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)
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// TraceProvider is the internal implementation for global.TraceProvider.
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func TraceProvider() trace.Provider {
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return globalTracer.Load().(traceProviderHolder).tp
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}
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// SetTraceProvider is the internal implementation for global.SetTraceProvider.
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func SetTraceProvider(tp trace.Provider) {
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delegateTraceOnce.Do(func() {
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current := TraceProvider()
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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 Provider, the global instance cannot be reinstalled")
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} else if def, ok := current.(*traceProvider); ok {
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def.setDelegate(tp)
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}
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})
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globalTracer.Store(traceProviderHolder{tp: tp})
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}
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// MeterProvider is the internal implementation for global.MeterProvider.
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func MeterProvider() metric.Provider {
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return globalMeter.Load().(meterProviderHolder).mp
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}
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// SetMeterProvider is the internal implementation for global.SetMeterProvider.
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func SetMeterProvider(mp metric.Provider) {
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delegateMeterOnce.Do(func() {
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current := MeterProvider()
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if current == mp {
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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 Provider, the global instance cannot be reinstalled")
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} else if def, ok := current.(*meterProvider); ok {
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def.setDelegate(mp)
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}
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})
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globalMeter.Store(meterProviderHolder{mp: mp})
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}
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// Propagators is the internal implementation for global.Propagators.
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func Propagators() propagation.Propagators {
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return globalPropagators.Load().(propagatorsHolder).pr
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}
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// SetPropagators is the internal implementation for global.SetPropagators.
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func SetPropagators(pr propagation.Propagators) {
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globalPropagators.Store(propagatorsHolder{pr: pr})
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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(traceProviderHolder{tp: &traceProvider{}})
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return v
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}
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func defaultMeterValue() *atomic.Value {
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v := &atomic.Value{}
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v.Store(meterProviderHolder{mp: &meterProvider{}})
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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{pr: getDefaultPropagators()})
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return v
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}
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// getDefaultPropagators returns a default Propagators, configured
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// with W3C trace and correlation context propagation.
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func getDefaultPropagators() propagation.Propagators {
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tcPropagator := trace.TraceContext{}
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ccPropagator := correlation.CorrelationContext{}
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return propagation.New(
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propagation.WithExtractors(tcPropagator, ccPropagator),
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propagation.WithInjectors(tcPropagator, ccPropagator),
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)
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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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globalMeter = defaultMeterValue()
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globalPropagators = defaultPropagatorsValue()
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delegateMeterOnce = sync.Once{}
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delegateTraceOnce = sync.Once{}
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}
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