| // 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, makeEvent(StartSpanType, sTags{Name.Of(name)}, tags)) |
| return ctx, func() { dispatch(ctx, makeEvent(EndSpanType, sTags{}, nil)) } |
| } |
| |
| // 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, makeEvent(DetachType, sTags{}, nil)) |
| } |
