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|
package qlog
import (
"bytes"
"fmt"
"io"
"log"
"time"
"github.com/francoispqt/gojay"
)
const eventChanSize = 50
const recordSeparator = 0x1e
func writeRecordSeparator(w io.Writer) error {
_, err := w.Write([]byte{recordSeparator})
return err
}
type writer struct {
w io.WriteCloser
referenceTime time.Time
tr *trace
events chan event
encodeErr error
runStopped chan struct{}
}
func newWriter(w io.WriteCloser, tr *trace) *writer {
return &writer{
w: w,
tr: tr,
referenceTime: tr.CommonFields.ReferenceTime,
runStopped: make(chan struct{}),
events: make(chan event, eventChanSize),
}
}
func (w *writer) RecordEvent(eventTime time.Time, details eventDetails) {
w.events <- event{
RelativeTime: eventTime.Sub(w.referenceTime),
eventDetails: details,
}
}
func (w *writer) Run() {
defer close(w.runStopped)
buf := &bytes.Buffer{}
enc := gojay.NewEncoder(buf)
if err := writeRecordSeparator(buf); err != nil {
panic(fmt.Sprintf("qlog encoding into a bytes.Buffer failed: %s", err))
}
if err := enc.Encode(&topLevel{trace: *w.tr}); err != nil {
panic(fmt.Sprintf("qlog encoding into a bytes.Buffer failed: %s", err))
}
if err := buf.WriteByte('\n'); err != nil {
panic(fmt.Sprintf("qlog encoding into a bytes.Buffer failed: %s", err))
}
if _, err := w.w.Write(buf.Bytes()); err != nil {
w.encodeErr = err
}
enc = gojay.NewEncoder(w.w)
for ev := range w.events {
if w.encodeErr != nil { // if encoding failed, just continue draining the event channel
continue
}
if err := writeRecordSeparator(w.w); err != nil {
w.encodeErr = err
continue
}
if err := enc.Encode(ev); err != nil {
w.encodeErr = err
continue
}
if _, err := w.w.Write([]byte{'\n'}); err != nil {
w.encodeErr = err
}
}
}
func (w *writer) Close() {
if err := w.close(); err != nil {
log.Printf("exporting qlog failed: %s\n", err)
}
}
func (w *writer) close() error {
close(w.events)
<-w.runStopped
if w.encodeErr != nil {
return w.encodeErr
}
return w.w.Close()
}
|
