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62 lines
2.3 KiB
Go
62 lines
2.3 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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package trace // import "go.opentelemetry.io/otel/trace"
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import "context"
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type traceContextKeyType int
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const currentSpanKey traceContextKeyType = iota
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// ContextWithSpan returns a copy of parent with span set as the current Span.
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func ContextWithSpan(parent context.Context, span Span) context.Context {
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return context.WithValue(parent, currentSpanKey, span)
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}
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// ContextWithSpanContext returns a copy of parent with sc as the current
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// Span. The Span implementation that wraps sc is non-recording and performs
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// no operations other than to return sc as the SpanContext from the
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// SpanContext method.
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func ContextWithSpanContext(parent context.Context, sc SpanContext) context.Context {
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return ContextWithSpan(parent, nonRecordingSpan{sc: sc})
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}
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// ContextWithRemoteSpanContext returns a copy of parent with rsc set explicly
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// as a remote SpanContext and as the current Span. The Span implementation
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// that wraps rsc is non-recording and performs no operations other than to
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// return rsc as the SpanContext from the SpanContext method.
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func ContextWithRemoteSpanContext(parent context.Context, rsc SpanContext) context.Context {
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return ContextWithSpanContext(parent, rsc.WithRemote(true))
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}
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// SpanFromContext returns the current Span from ctx.
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//
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// If no Span is currently set in ctx an implementation of a Span that
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// performs no operations is returned.
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func SpanFromContext(ctx context.Context) Span {
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if ctx == nil {
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return noopSpan{}
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}
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if span, ok := ctx.Value(currentSpanKey).(Span); ok {
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return span
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}
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return noopSpan{}
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}
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// SpanContextFromContext returns the current Span's SpanContext.
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func SpanContextFromContext(ctx context.Context) SpanContext {
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return SpanFromContext(ctx).SpanContext()
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}
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