forked from toolshed/abra
51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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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 explicitly
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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 noopSpanInstance
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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 noopSpanInstance
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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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