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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)
77 lines
3.3 KiB
Go
77 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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// This package provides interfaces and functions that are useful for
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// providing a cooperation of the OpenTelemetry tracers with the
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// OpenTracing API.
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package migration // import "go.opentelemetry.io/otel/bridge/opentracing/migration"
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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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)
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// DeferredContextSetupTracerExtension is an interface an
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// OpenTelemetry tracer may implement in order to cooperate with the
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// calls to the OpenTracing API.
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//
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// Tracers implementing this interface should also use the
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// SkipContextSetup() function during creation of the span in the
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// Start() function to skip the configuration of the context.
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type DeferredContextSetupTracerExtension interface {
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// DeferredContextSetupHook is called by the bridge
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// OpenTracing tracer when opentracing.ContextWithSpan is
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// called. This allows the OpenTelemetry tracer to set up the
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// context in a way it would normally do during the Start()
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// function. Since OpenTracing API does not support
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// configuration of the context during span creation, it needs
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// to be deferred until the call to the
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// opentracing.ContextWithSpan happens. When bridge
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// OpenTracing tracer calls OpenTelemetry tracer's Start()
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// function, it passes a context that shouldn't be modified.
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DeferredContextSetupHook(ctx context.Context, span oteltrace.Span) context.Context
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}
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// OverrideTracerSpanExtension is an interface an OpenTelemetry span
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// may implement in order to cooperate with the calls to the
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// OpenTracing API.
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//
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// TODO(krnowak): I'm actually not so sold on the idea… The reason for
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// introducing this interface was to have a span "created" by the
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// WrapperTracer return WrapperTracer from the Tracer() function, not
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// the real OpenTelemetry tracer that actually created the span. I'm
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// thinking that I could create a wrapperSpan type that wraps an
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// OpenTelemetry Span object and have WrapperTracer to alter the
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// current OpenTelemetry span in the context so it points to the
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// wrapped object, so the code in the tracer like
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// `trace.SpanFromContent().(*realSpan)` would still work. Another
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// argument for getting rid of this interface is that is only called
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// by the WrapperTracer - WrapperTracer likely shouldn't require any
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// changes in the underlying OpenTelemetry tracer to have things
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// somewhat working.
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//
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// See the "tracer mess" test in mix_test.go.
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type OverrideTracerSpanExtension interface {
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// OverrideTracer makes the span to return the passed tracer
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// from its Tracer() function.
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//
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// You don't need to implement this function if your
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// OpenTelemetry tracer cooperates well with the OpenTracing
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// API calls. In such case, there is no need to use the
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// WrapperTracer and thus no need to override the result of
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// the Tracer() function.
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OverrideTracer(oteltrace.Tracer)
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}
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