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https://github.com/golang/go
synced 2024-11-06 06:26:13 -07:00
cb106d260e
This allows early exporters to adjust the event for later ones. This is used to lookup key values from the context if needed. Also add a Query type event which is intended to perform all event modifications but nothing else, and is used to lookup values from the context. This cleans up a weirdness where the current lookup presumes there will be an exporter with a matching mechanism. Change-Id: I835d1e0b2511553c30f94b7becfe7b7b5462c111 Reviewed-on: https://go-review.googlesource.com/c/tools/+/223657 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
56 lines
1.4 KiB
Go
56 lines
1.4 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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"os"
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"golang.org/x/tools/internal/telemetry/event"
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)
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func init() {
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event.SetExporter(LogWriter(os.Stderr, true))
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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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return &logWriter{writer: w, onlyErrors: onlyErrors}
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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) (context.Context, event.Event) {
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switch {
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case ev.IsLog():
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if w.onlyErrors && ev.Error == nil {
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return ctx, ev
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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, ev
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}
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func (w *logWriter) Metric(context.Context, event.MetricData) {}
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