mirror of https://github.com/golang/go.git
113 lines
3.5 KiB
Go
113 lines
3.5 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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"strconv"
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"sync"
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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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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 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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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 := event.Msg.Get(tagMap)
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io.WriteString(w.writer, msg)
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if err := event.Err.Get(tagMap); 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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tag := ev.Tag(index)
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if !tag.Valid() || tag.Key == event.Msg || tag.Key == event.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, tag.Key.Name())
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io.WriteString(w.writer, "=")
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switch key := tag.Key.(type) {
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case *event.IntKey:
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w.writer.Write(strconv.AppendInt(buf, int64(key.From(tag)), 10))
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case *event.Int8Key:
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w.writer.Write(strconv.AppendInt(buf, int64(key.From(tag)), 10))
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case *event.Int16Key:
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w.writer.Write(strconv.AppendInt(buf, int64(key.From(tag)), 10))
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case *event.Int32Key:
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w.writer.Write(strconv.AppendInt(buf, int64(key.From(tag)), 10))
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case *event.Int64Key:
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w.writer.Write(strconv.AppendInt(buf, key.From(tag), 10))
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case *event.UIntKey:
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w.writer.Write(strconv.AppendUint(buf, uint64(key.From(tag)), 10))
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case *event.UInt8Key:
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w.writer.Write(strconv.AppendUint(buf, uint64(key.From(tag)), 10))
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case *event.UInt16Key:
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w.writer.Write(strconv.AppendUint(buf, uint64(key.From(tag)), 10))
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case *event.UInt32Key:
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w.writer.Write(strconv.AppendUint(buf, uint64(key.From(tag)), 10))
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case *event.UInt64Key:
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w.writer.Write(strconv.AppendUint(buf, key.From(tag), 10))
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case *event.Float32Key:
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w.writer.Write(strconv.AppendFloat(buf, float64(key.From(tag)), 'E', -1, 32))
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case *event.Float64Key:
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w.writer.Write(strconv.AppendFloat(buf, key.From(tag), 'E', -1, 64))
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case *event.BooleanKey:
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w.writer.Write(strconv.AppendBool(buf, key.From(tag)))
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case *event.StringKey:
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w.writer.Write(strconv.AppendQuote(buf, key.From(tag)))
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case *event.ErrorKey:
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io.WriteString(w.writer, key.From(tag).Error())
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case *event.ValueKey:
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fmt.Fprint(w.writer, key.From(tag))
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default:
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fmt.Fprintf(w.writer, `"invalid key type %T"`, key)
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}
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}
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io.WriteString(w.writer, "\n")
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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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