def cancel(self):
"""
After calling this method the session cannot be used anymore.
"""
if self._state < self.REQUESTING or self._state >= self.CACHED:
return
self.log("Canceling caching session for %s", self.url)
self.strategy._onSessionCanceled(self)
self.cache_stats.onCopyCancelled(self.size, self._bytes)
self._close()
error = fileprovider.FileOutOfDate("File out of date")
self._fireError(error)
if self._request:
self.debug("Caching canceled for %s (%d/%d Bytes ~ %d %%)",
self.url, self._bytes, self.size,
self.size and int(self._bytes * 100 / self.size))
self._request.cancel()
self._request = None
else:
self.debug("Caching canceled before starting to cache")
self._state = self.CANCELED
def read(self, offset, size):
if self._state == self.CANCELED:
raise fileprovider.FileOutOfDate("File out of date")
if self._state == self.ABORTED:
return None
if self._state >= self.CLOSED:
raise fileprovider.FileClosedError("Session Closed")
if self._file is None:
return None
if min(self.size, offset + size) > self._bytes:
return None
self._file.seek(offset)
return self._file.read(size)
def streamNotAvailable(self, getter, code, message):
assert self._deferred is not None, "Not retrieving anything"
error = fileprovider.FileOutOfDate(message)
self._deferred.errback(error)
self._cleanup()
def conditionFail(self, getter, code, message):
assert self._deferred is not None, "Not retrieving anything"
self._deferred.errback(fileprovider.FileOutOfDate(message))
self._cleanup()