mirror of
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>
40 lines
1.2 KiB
Go
40 lines
1.2 KiB
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 trace adds support for telemetry tracing.
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package trace
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import (
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"context"
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"time"
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"golang.org/x/tools/internal/telemetry"
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"golang.org/x/tools/internal/telemetry/export"
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"golang.org/x/tools/internal/telemetry/tag"
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)
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func StartSpan(ctx context.Context, name string, tags ...telemetry.Tag) (context.Context, func()) {
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start := time.Now()
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span := &telemetry.Span{Name: name}
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if parent := telemetry.GetSpan(ctx); parent != nil {
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span.ID.TraceID = parent.ID.TraceID
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span.ParentID = parent.ID.SpanID
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} else {
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span.ID.TraceID = telemetry.NewTraceID()
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}
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span.ID.SpanID = telemetry.NewSpanID()
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ctx = telemetry.WithSpan(ctx, span)
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if len(tags) > 0 {
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ctx = tag.With(ctx, tags...)
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}
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export.StartSpan(ctx, span, start)
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return ctx, func() { export.FinishSpan(ctx, span, time.Now()) }
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}
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// Detach returns a context without an associated span.
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// This allows the creation of spans that are not children of the current span.
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func Detach(ctx context.Context) context.Context {
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return telemetry.WithSpan(ctx, nil)
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}
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