.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/event/export/log.go

   1 // Copyright 2019 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package export
   6
   7 import (
   8         "context"
   9         "fmt"
  10         "io"
  11         "sync"
  12
  13         "golang.org/x/tools/internal/event"
  14         "golang.org/x/tools/internal/event/core"
  15         "golang.org/x/tools/internal/event/label"
  16 )
  17
  18 // LogWriter returns an Exporter that logs events to the supplied writer.
  19 // If onlyErrors is true it does not log any event that did not have an
  20 // associated error.
  21 // It ignores all telemetry other than log events.
  22 func LogWriter(w io.Writer, onlyErrors bool) event.Exporter {
  23         lw := &logWriter{writer: w, onlyErrors: onlyErrors}
  24         return lw.ProcessEvent
  25 }
  26
  27 type logWriter struct {
  28         mu         sync.Mutex
  29         printer    Printer
  30         writer     io.Writer
  31         onlyErrors bool
  32 }
  33
  34 func (w *logWriter) ProcessEvent(ctx context.Context, ev core.Event, lm label.Map) context.Context {
  35         switch {
  36         case event.IsLog(ev):
  37                 if w.onlyErrors && !event.IsError(ev) {
  38                         return ctx
  39                 }
  40                 w.mu.Lock()
  41                 defer w.mu.Unlock()
  42                 w.printer.WriteEvent(w.writer, ev, lm)
  43
  44         case event.IsStart(ev):
  45                 if span := GetSpan(ctx); span != nil {
  46                         fmt.Fprintf(w.writer, "start: %v %v", span.Name, span.ID)
  47                         if span.ParentID.IsValid() {
  48                                 fmt.Fprintf(w.writer, "[%v]", span.ParentID)
  49                         }
  50                 }
  51         case event.IsEnd(ev):
  52                 if span := GetSpan(ctx); span != nil {
  53                         fmt.Fprintf(w.writer, "finish: %v %v", span.Name, span.ID)
  54                 }
  55         }
  56         return ctx
  57 }