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fake_log_writer.go
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/
fake_log_writer.go
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package event
import (
"bufio"
"context"
"encoding/json"
"os"
"sync/atomic"
"time"
"github.com/segmentio/errors-go"
"github.com/segmentio/events/v2"
)
type fakeLogWriter struct {
path string
family string
table string
delay time.Duration
rotateAfter int
rotateAfterBytes int
seq int64
rotations int64
}
// writes N events to the log
func (w *fakeLogWriter) writeN(ctx context.Context, n int) error {
f, err := os.Create(w.path)
if err != nil {
return errors.Wrap(err, "create file")
}
defer func() {
events.Debug("Done writing %{num}d events", n)
if err == nil {
err = f.Close()
}
}()
bw := bufio.NewWriter(f)
total := 0
these := 0
for total < n && ctx.Err() == nil {
total++
these++
entry := entry{
Seq: atomic.LoadInt64(&w.seq),
Family: w.family,
Table: w.table,
Key: []Key{
{
Name: "id-column",
Type: "int",
Value: 42,
},
},
}
atomic.AddInt64(&w.seq, 1)
err := json.NewEncoder(bw).Encode(entry)
if err != nil {
return errors.Wrap(err, "write event")
}
if err := bw.Flush(); err != nil {
return errors.Wrap(err, "flush")
}
time.Sleep(w.delay)
doRotate := false
if w.rotateAfterBytes > 0 {
info, err := os.Stat(w.path)
if err != nil {
return errors.Wrap(err, "stat path")
}
// fmt.Println(info.Size(), w.rotateAfterBytes)
if info.Size() > int64(w.rotateAfterBytes) {
events.Log("Rotation required (file size is %{bytes}d seq=%{seq}d)", info.Size(), atomic.LoadInt64(&w.seq))
doRotate = true
}
}
if w.rotateAfter > 0 && these >= w.rotateAfter {
doRotate = true
}
if doRotate {
events.Debug("Rotating log file..")
these = 0
if err := f.Close(); err != nil {
return errors.Wrap(err, "close during rotation")
}
if err := os.Remove(f.Name()); err != nil {
return errors.Wrap(err, "remove file")
}
f, err = os.Create(w.path)
if err != nil {
return errors.Wrap(err, "rotate into new file")
}
bw = bufio.NewWriter(f)
atomic.AddInt64(&w.rotations, 1)
}
}
return nil
}