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1 | // Copyright 2017 The Go Authors. All rights reserved. |
2 | // Use of this source code is governed by a BSD-style | |
3 | // license that can be found in the LICENSE file. | |
4 | ||
5 | // +build go1.7 | |
6 | ||
7 | package trace | |
8 | ||
9 | import "context" | |
10 | ||
11 | // NewContext returns a copy of the parent context | |
12 | // and associates it with a Trace. | |
13 | func NewContext(ctx context.Context, tr Trace) context.Context { | |
14 | return context.WithValue(ctx, contextKey, tr) | |
15 | } | |
16 | ||
17 | // FromContext returns the Trace bound to the context, if any. | |
18 | func FromContext(ctx context.Context) (tr Trace, ok bool) { | |
19 | tr, ok = ctx.Value(contextKey).(Trace) | |
20 | return | |
21 | } |