mirror of
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)
113 lines
3.9 KiB
Go
113 lines
3.9 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
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import (
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"context"
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oteltrace "go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/bridge/opentracing/migration"
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)
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type WrapperProvider struct {
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wTracer *WrapperTracer
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}
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var _ oteltrace.Provider = (*WrapperProvider)(nil)
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// Tracer returns the WrapperTracer associated with the WrapperProvider.
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func (p *WrapperProvider) Tracer(name string) oteltrace.Tracer {
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return p.wTracer
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}
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// NewWrappedProvider 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 NewWrappedProvider(bridge *BridgeTracer, tracer oteltrace.Tracer) *WrapperProvider {
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return &WrapperProvider{
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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 oteltrace.Tracer
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}
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var _ oteltrace.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 oteltrace.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() oteltrace.Tracer {
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return t.tracer
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}
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// WithSpan forwards the call to the wrapped tracer with a modified
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// body callback, which sets the active OpenTracing span before
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// calling the original callback.
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func (t *WrapperTracer) WithSpan(ctx context.Context, name string, body func(context.Context) error, opts ...oteltrace.StartOption) error {
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return t.otelTracer().WithSpan(ctx, name, func(ctx context.Context) error {
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span := oteltrace.SpanFromContext(ctx)
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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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ctx = t.bridge.ContextWithBridgeSpan(ctx, span)
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return body(ctx)
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}, opts...)
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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 ...oteltrace.StartOption) (context.Context, oteltrace.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 oteltrace.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 = oteltrace.ContextWithSpan(ctx, span)
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return ctx
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}
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