22 lines
584 B
Go
22 lines
584 B
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build go1.7
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package trace
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import "context"
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// NewContext returns a copy of the parent context
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// and associates it with a Trace.
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func NewContext(ctx context.Context, tr Trace) context.Context {
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return context.WithValue(ctx, contextKey, tr)
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}
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// FromContext returns the Trace bound to the context, if any.
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func FromContext(ctx context.Context) (tr Trace, ok bool) {
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tr, ok = ctx.Value(contextKey).(Trace)
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return
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}
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