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https://github.com/golang/go
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5b08f89bfc
this shuffles things so there a single exporter API rather than an observer It also removes most of the globals. per telemetry type. Change-Id: Iaa82abe2ded1fff9df8e067ed4a55bcbd9d9591f Reviewed-on: https://go-review.googlesource.com/c/tools/+/190405 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
26 lines
518 B
Go
26 lines
518 B
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package telemetry
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import "context"
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type contextKeyType int
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const (
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spanContextKey = contextKeyType(iota)
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)
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func WithSpan(ctx context.Context, span *Span) context.Context {
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return context.WithValue(ctx, spanContextKey, span)
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}
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func GetSpan(ctx context.Context) *Span {
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v := ctx.Value(spanContextKey)
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if v == nil {
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return nil
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}
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return v.(*Span)
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}
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