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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 (
"context"
"fmt"
"io"
"sync"
"golang.org/x/tools/internal/event"
"golang.org/x/tools/internal/event/core"
"golang.org/x/tools/internal/event/label"
)
// LogWriter returns an Exporter 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) event.Exporter {
lw := &logWriter{writer: w, onlyErrors: onlyErrors}
return lw.ProcessEvent
}
type logWriter struct {
mu sync.Mutex
printer Printer
writer io.Writer
onlyErrors bool
}
func (w *logWriter) ProcessEvent(ctx context.Context, ev core.Event, lm label.Map) context.Context {
switch {
case event.IsLog(ev):
if w.onlyErrors && !event.IsError(ev) {
return ctx
}
w.mu.Lock()
defer w.mu.Unlock()
w.printer.WriteEvent(w.writer, ev, lm)
case event.IsStart(ev):
if span := GetSpan(ctx); span != nil {
fmt.Fprintf(w.writer, "start: %v %v", span.Name, span.ID)
if span.ParentID.IsValid() {
fmt.Fprintf(w.writer, "[%v]", span.ParentID)
}
}
case event.IsEnd(ev):
if span := GetSpan(ctx); span != nil {
fmt.Fprintf(w.writer, "finish: %v %v", span.Name, span.ID)
}
}
return ctx
}
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