Reopen log file if needed. Checks if the underlying file has changed, and if it has, close the old stream and reopen the file to get the current stream.
(self)
| 494 | self.ino = sres.st_ino |
| 495 | |
| 496 | def reopenIfNeeded(self): |
| 497 | """ |
| 498 | Reopen log file if needed. |
| 499 | |
| 500 | Checks if the underlying file has changed, and if it |
| 501 | has, close the old stream and reopen the file to get the |
| 502 | current stream. |
| 503 | """ |
| 504 | if self.stream is None: |
| 505 | return |
| 506 | |
| 507 | # Reduce the chance of race conditions by stat'ing by path only |
| 508 | # once and then fstat'ing our new fd if we opened a new log stream. |
| 509 | # See issue #14632: Thanks to John Mulligan for the problem report |
| 510 | # and patch. |
| 511 | try: |
| 512 | # stat the file by path, checking for existence |
| 513 | sres = os.stat(self.baseFilename) |
| 514 | |
| 515 | # compare file system stat with that of our stream file handle |
| 516 | reopen = (sres.st_dev != self.dev or sres.st_ino != self.ino) |
| 517 | except FileNotFoundError: |
| 518 | reopen = True |
| 519 | |
| 520 | if not reopen: |
| 521 | return |
| 522 | |
| 523 | # we have an open file handle, clean it up |
| 524 | self.stream.flush() |
| 525 | self.stream.close() |
| 526 | self.stream = None # See Issue #21742: _open () might fail. |
| 527 | |
| 528 | # open a new file handle and get new stat info from that fd |
| 529 | self.stream = self._open() |
| 530 | self._statstream() |
| 531 | |
| 532 | def emit(self, record): |
| 533 | """ |