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 } 22
