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https://github.com/golang/go
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f61d083d3b
Change-Id: I0e6a26c62bd1f6eaa07c38a06152cb7a0f2eedc2 Reviewed-on: https://go-review.googlesource.com/c/tools/+/225579 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com> Reviewed-by: Robert Findley <rfindley@google.com>
50 lines
1.3 KiB
Go
50 lines
1.3 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 export
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import (
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"context"
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"fmt"
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"io"
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"golang.org/x/tools/internal/telemetry/event"
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)
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// LogWriter returns an Exporter that logs events to the supplied writer.
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// If onlyErrors is true it does not log any event that did not have an
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// associated error.
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// It ignores all telemetry other than log events.
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func LogWriter(w io.Writer, onlyErrors bool) event.Exporter {
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lw := &logWriter{writer: w, onlyErrors: onlyErrors}
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return lw.ProcessEvent
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}
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type logWriter struct {
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writer io.Writer
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onlyErrors bool
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}
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func (w *logWriter) ProcessEvent(ctx context.Context, ev event.Event, tagMap event.TagMap) context.Context {
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switch {
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case ev.IsLog():
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if w.onlyErrors && event.Err.Get(tagMap) == nil {
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return ctx
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}
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fmt.Fprintf(w.writer, "%v\n", ev)
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case ev.IsStartSpan():
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if span := GetSpan(ctx); span != nil {
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fmt.Fprintf(w.writer, "start: %v %v", span.Name, span.ID)
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if span.ParentID.IsValid() {
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fmt.Fprintf(w.writer, "[%v]", span.ParentID)
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}
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}
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case ev.IsEndSpan():
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if span := GetSpan(ctx); span != nil {
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fmt.Fprintf(w.writer, "finish: %v %v", span.Name, span.ID)
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}
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}
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return ctx
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}
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