func runSnapshot(cmd *Command) error {
f, err := os.OpenFile(
cmd.Globals.File,
os.O_CREATE|os.O_EXCL|os.O_WRONLY|os.O_TRUNC,
0666,
)
if err != nil {
if os.IsExist(err) {
return fmt.Errorf("Journal already exists at %s", cmd.Globals.File)
}
return fmt.Errorf("Unable to open journal: %s", err)
}
j := journal.New(f)
err = journal.Snapshot(cmd.Conn, cmd.Rev, cmd.Globals.Root, j)
if err != nil {
return err
}
err = f.Sync()
if err != nil {
return fmt.Errorf("file sync failed: %s", err)
}
return nil
}
func runJournal(cmd *Command) error {
sighupc := make(chan os.Signal, 1)
signal.Notify(sighupc, syscall.SIGHUP)
f, err := newJournalFile(cmd.Globals.File)
if err != nil {
return err
}
defer f.Close()
j := journal.New(f)
err = journal.Snapshot(cmd.Conn, cmd.Rev, cmd.Globals.Root, j)
if err != nil {
return err
}
if err := f.Sync(); err != nil {
return fmt.Errorf("file sync failed: %s", err)
}
var (
isUnsynced = false
opCounter = 0
rev = cmd.Rev
syncInterval = 10 * time.Second
syncOps = 100
watchroot = path.Join(cmd.Globals.Root, "**")
errc = make(chan error)
eventc = make(chan doozer.Event)
ticker = time.Tick(syncInterval)
)
go func(errc chan error, eventc chan doozer.Event, rev int64) {
for {
ev, err := cmd.Conn.Wait(watchroot, rev+1)
if err != nil {
errc <- fmt.Errorf("conn wait failed: %s", err)
return
}
// Advance in time!
rev = ev.Rev
eventc <- ev
}
}(errc, eventc, rev)
for {
select {
case ev := <-eventc:
var entry *journal.Entry
if ev.IsSet() {
entry = journal.NewEntry(ev.Rev, journal.OpSet, ev.Path, ev.Body)
} else if ev.IsDel() {
entry = journal.NewEntry(ev.Rev, journal.OpDel, ev.Path, []byte{})
} else {
continue
}
err = j.Append(entry)
if err != nil {
return err
}
opCounter++
// Log entry
b, err := journal.Marshal(entry)
if err != nil {
return fmt.Errorf("entry marshal failed: %s", err)
}
if !strings.HasPrefix(ev.Path, journal.InternalPrefix) {
fmt.Fprintf(os.Stdout, "%s\n", string(b))
}
case <-sighupc:
if err := f.reopen(); err != nil {
return err
}
case err := <-errc:
return err
case <-ticker:
isUnsynced = true
}
if opCounter >= syncOps || isUnsynced {
if err := f.Sync(); err != nil {
return fmt.Errorf("file sync failed: %s", err)
}
isUnsynced = false
opCounter = 0
}
}
}