| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package event |
| |
| import ( |
| "context" |
| ) |
| |
| func StartSpan(ctx context.Context, name string, tags ...Tag) (context.Context, func()) { |
| ctx = dispatch(ctx, Event{ |
| typ: StartSpanType, |
| Message: name, |
| tags: tags, |
| }) |
| return ctx, func() { |
| dispatch(ctx, Event{typ: EndSpanType}) |
| } |
| } |
| |
| // Detach returns a context without an associated span. |
| // This allows the creation of spans that are not children of the current span. |
| func Detach(ctx context.Context) context.Context { |
| return dispatch(ctx, Event{typ: DetachType}) |
| } |