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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 export
import (
// LogWriter returns an observer that logs events to the supplied writer.
// If onlyErrors is true it does not log any event that did not have an
// associated error.
// It ignores all telemetry other than log events.
func LogWriter(w io.Writer, onlyErrors bool) Exporter {
return &logWriter{writer: w, onlyErrors: onlyErrors}
type logWriter struct {
writer io.Writer
onlyErrors bool
func (w *logWriter) StartSpan(context.Context, *telemetry.Span) {}
func (w *logWriter) FinishSpan(context.Context, *telemetry.Span) {}
func (w *logWriter) Log(ctx context.Context, event telemetry.Event) {
if event.Error == nil {
// we only log errors by default
fmt.Fprintf(w.writer, "%v\n", event)
func (w *logWriter) Metric(context.Context, telemetry.MetricData) {}
func (w *logWriter) Flush() {}
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