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 7package trace 8 9import "golang.org/x/net/context" 10 11// NewContext returns a copy of the parent context 12// and associates it with a Trace. 13func 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. 18func FromContext(ctx context.Context) (tr Trace, ok bool) { 19 tr, ok = ctx.Value(contextKey).(Trace) 20 return 21} 22