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.
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)
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)