mirror of
https://github.com/golang/go
synced 2024-09-30 22:58:34 -06:00
a90b7300be
Instead of tagging events with their type, instead we infer the type from the label pattern. The standard event creators all have a matching test that returns true if the the labels pattern matches the ones that would be built by the creator. Spans and logs already have a unique label pattern, other event types required a special label marker. This makes the system much more extensible, and also cleans up some the API. Change-Id: I1fbc9ec07aa84ead6c12bbd5ca65b13b605bfa4a Reviewed-on: https://go-review.googlesource.com/c/tools/+/229242 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
80 lines
2.0 KiB
Go
80 lines
2.0 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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"sync"
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"golang.org/x/tools/internal/event"
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"golang.org/x/tools/internal/event/core"
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"golang.org/x/tools/internal/event/keys"
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"golang.org/x/tools/internal/event/label"
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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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mu sync.Mutex
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buffer [128]byte
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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 core.Event, lm label.Map) context.Context {
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switch {
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case event.IsLog(ev):
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if w.onlyErrors && !event.IsError(ev) {
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return ctx
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}
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w.mu.Lock()
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defer w.mu.Unlock()
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buf := w.buffer[:0]
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if !ev.At().IsZero() {
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w.writer.Write(ev.At().AppendFormat(buf, "2006/01/02 15:04:05 "))
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}
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msg := keys.Msg.Get(lm)
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io.WriteString(w.writer, msg)
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if err := keys.Err.Get(lm); err != nil {
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io.WriteString(w.writer, ": ")
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io.WriteString(w.writer, err.Error())
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}
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for index := 0; ev.Valid(index); index++ {
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l := ev.Label(index)
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if !l.Valid() || l.Key() == keys.Msg || l.Key() == keys.Err {
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continue
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}
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io.WriteString(w.writer, "\n\t")
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io.WriteString(w.writer, l.Key().Name())
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io.WriteString(w.writer, "=")
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l.Key().Format(w.writer, buf, l)
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}
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io.WriteString(w.writer, "\n")
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case event.IsStart(ev):
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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 event.IsEnd(ev):
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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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