| 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 | } |
| 58 |
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