mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-04 09:43:23 +02:00
98 lines
3.4 KiB
Go
98 lines
3.4 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 opentracing // import "go.opentelemetry.io/otel/bridge/opentracing"
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import (
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"context"
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"go.opentelemetry.io/otel/bridge/opentracing/migration"
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"go.opentelemetry.io/otel/trace"
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)
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type WrapperTracerProvider struct {
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wTracer *WrapperTracer
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}
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var _ trace.TracerProvider = (*WrapperTracerProvider)(nil)
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// Tracer returns the WrapperTracer associated with the WrapperTracerProvider.
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func (p *WrapperTracerProvider) Tracer(_ string, _ ...trace.TracerOption) trace.Tracer {
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return p.wTracer
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}
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// NewWrappedTracerProvider creates a new trace provider that creates a single
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// instance of WrapperTracer that wraps OpenTelemetry tracer.
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func NewWrappedTracerProvider(bridge *BridgeTracer, tracer trace.Tracer) *WrapperTracerProvider {
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return &WrapperTracerProvider{
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wTracer: NewWrapperTracer(bridge, tracer),
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}
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}
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// WrapperTracer is a wrapper around an OpenTelemetry tracer. It
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// mostly forwards the calls to the wrapped tracer, but also does some
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// extra steps like setting up a context with the active OpenTracing
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// span.
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//
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// It does not need to be used when the OpenTelemetry tracer is also
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// aware how to operate in environment where OpenTracing API is also
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// used.
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type WrapperTracer struct {
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bridge *BridgeTracer
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tracer trace.Tracer
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}
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var _ trace.Tracer = &WrapperTracer{}
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var _ migration.DeferredContextSetupTracerExtension = &WrapperTracer{}
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// NewWrapperTracer wraps the passed tracer and also talks to the
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// passed bridge tracer when setting up the context with the new
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// active OpenTracing span.
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func NewWrapperTracer(bridge *BridgeTracer, tracer trace.Tracer) *WrapperTracer {
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return &WrapperTracer{
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bridge: bridge,
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tracer: tracer,
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}
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}
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func (t *WrapperTracer) otelTracer() trace.Tracer {
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return t.tracer
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}
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// Start forwards the call to the wrapped tracer. It also tries to
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// override the tracer of the returned span if the span implements the
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// OverrideTracerSpanExtension interface.
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func (t *WrapperTracer) Start(ctx context.Context, name string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
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ctx, span := t.otelTracer().Start(ctx, name, opts...)
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if spanWithExtension, ok := span.(migration.OverrideTracerSpanExtension); ok {
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spanWithExtension.OverrideTracer(t)
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}
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if !migration.SkipContextSetup(ctx) {
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ctx = t.bridge.ContextWithBridgeSpan(ctx, span)
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}
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return ctx, span
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}
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// DeferredContextSetupHook is a part of the implementation of the
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// DeferredContextSetupTracerExtension interface. It will try to
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// forward the call to the wrapped tracer if it implements the
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// interface.
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func (t *WrapperTracer) DeferredContextSetupHook(ctx context.Context, span trace.Span) context.Context {
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if tracerWithExtension, ok := t.otelTracer().(migration.DeferredContextSetupTracerExtension); ok {
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ctx = tracerWithExtension.DeferredContextSetupHook(ctx, span)
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}
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ctx = trace.ContextWithSpan(ctx, span)
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return ctx
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}
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