| 65 | } |
| 66 | |
| 67 | func (c *Client) lockFs() error { |
| 68 | if c.lockfd != nil { |
| 69 | return errors.Errorf("lock again") |
| 70 | } |
| 71 | if err := mkdirFor(c.LockFile); err != nil { |
| 72 | return err |
| 73 | } |
| 74 | f, err := os.OpenFile(c.LockFile, os.O_WRONLY|os.O_CREATE, 0644) |
| 75 | if err != nil { |
| 76 | return errors.Trace(err) |
| 77 | } |
| 78 | if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB); err != nil { |
| 79 | f.Close() |
| 80 | return errors.Trace(err) |
| 81 | } |
| 82 | var data = map[string]interface{}{ |
| 83 | "pid": os.Getpid(), |
| 84 | "now": time.Now().String(), |
| 85 | } |
| 86 | b, err := json.MarshalIndent(data, "", " ") |
| 87 | if err != nil { |
| 88 | log.WarnErrorf(err, "fsclient - lock encode json failed") |
| 89 | } else if err := f.Truncate(0); err != nil { |
| 90 | log.WarnErrorf(err, "fsclient - lock truncate failed") |
| 91 | } else if _, err := f.Write(b); err != nil { |
| 92 | log.WarnErrorf(err, "fsclient - lock write failed") |
| 93 | } |
| 94 | c.lockfd = f |
| 95 | return nil |
| 96 | } |
| 97 | |
| 98 | func (c *Client) unlockFs() { |
| 99 | if c.lockfd == nil { |