/
log.go
49 lines (43 loc) · 1.33 KB
/
log.go
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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"
"github.com/anz-bank/sysl/pkg/lspimpl/lspframework/telemetry"
)
// LogWriter returns an observer 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) Exporter {
return &logWriter{writer: w, onlyErrors: onlyErrors}
}
type logWriter struct {
writer io.Writer
onlyErrors bool
}
func (w *logWriter) ProcessEvent(ctx context.Context, event telemetry.Event) context.Context {
switch event.Type {
case telemetry.EventLog:
if w.onlyErrors && event.Error == nil {
return ctx
}
fmt.Fprintf(w.writer, "%v\n", event)
case telemetry.EventStartSpan:
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 telemetry.EventEndSpan:
if span := GetSpan(ctx); span != nil {
fmt.Fprintf(w.writer, "finish: %v %v", span.Name, span.ID)
}
}
return ctx
}
func (w *logWriter) Metric(context.Context, telemetry.MetricData) {}