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)
58 lines
1.7 KiB
Go
58 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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"go.opentelemetry.io/otel/api/core"
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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 core.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) core.SpanContext {
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if sc, ok := ctx.Value(remoteContextKey).(core.SpanContext); ok {
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return sc
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}
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return core.EmptySpanContext()
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}
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