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// 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 trace adds support for telemetry tracing.
package trace
import (
"context"
"time"
"golang.org/x/tools/internal/telemetry"
"golang.org/x/tools/internal/telemetry/export"
"golang.org/x/tools/internal/telemetry/tag"
)
func StartSpan(ctx context.Context, name string, tags ...telemetry.Tag) (context.Context, func()) {
start := time.Now()
span := &telemetry.Span{Name: name}
if parent := telemetry.GetSpan(ctx); parent != nil {
span.ID.TraceID = parent.ID.TraceID
span.ParentID = parent.ID.SpanID
} else {
span.ID.TraceID = telemetry.NewTraceID()
}
span.ID.SpanID = telemetry.NewSpanID()
ctx = telemetry.WithSpan(ctx, span)
if len(tags) > 0 {
ctx = tag.With(ctx, tags...)
}
export.StartSpan(ctx, span, start)
return ctx, func() { export.FinishSpan(ctx, span, time.Now()) }
}
// 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 telemetry.WithSpan(ctx, nil)
}
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