mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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a2c75c6d78
* Unexport NoopXXX trace types The change unexports the noop implementations and provide the NoopProvider function for user to construct noop providers. Users can access noop tracer and noop spans by using the provider. This change removes the types users should never be directly using from the package. It improves the usability of the API by reducing the API surface to half and helping the user to focus on the canonical APIs. Fixes #1133 * Provide noop tracer and span for internal use * Remove obsolete doc * Use noop span instead of nil * Fix the broken build
56 lines
1.7 KiB
Go
56 lines
1.7 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 trace
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import (
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"context"
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)
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type traceContextKeyType int
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const (
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currentSpanKey traceContextKeyType = iota
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remoteContextKey
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)
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// ContextWithSpan creates a new context with a current span set to
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// the passed span.
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func ContextWithSpan(ctx context.Context, span Span) context.Context {
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return context.WithValue(ctx, currentSpanKey, span)
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}
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// SpanFromContext returns the current span stored in the context.
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func SpanFromContext(ctx context.Context) Span {
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if span, has := ctx.Value(currentSpanKey).(Span); has {
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return span
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}
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return noopSpan{}
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}
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// ContextWithRemoteSpanContext creates a new context with a remote
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// span context set to the passed span context.
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func ContextWithRemoteSpanContext(ctx context.Context, sc SpanContext) context.Context {
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return context.WithValue(ctx, remoteContextKey, sc)
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}
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// RemoteSpanContextFromContext returns the remote span context stored
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// in the context.
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func RemoteSpanContextFromContext(ctx context.Context) SpanContext {
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if sc, ok := ctx.Value(remoteContextKey).(SpanContext); ok {
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return sc
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}
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return EmptySpanContext()
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}
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