def download(self):
if not is_valid_blobhash(self.blob_hash):
return defer.fail(Failure(InvalidBlobHashError(self.blob_hash)))
def cancel_download(d):
self.stop()
self.finished_deferred = defer.Deferred(canceller=cancel_download)
self.download_manager = DownloadManager(self.blob_manager, True)
self.download_manager.blob_requester = BlobRequester(self.blob_manager, self.peer_finder,
self.payment_rate_manager, self.wallet,
self.download_manager)
self.download_manager.blob_info_finder = SingleBlobMetadataHandler(self.blob_hash,
self.download_manager)
self.download_manager.progress_manager = SingleProgressManager(self._blob_downloaded,
self.download_manager)
self.download_manager.blob_handler = DummyBlobHandler()
self.download_manager.wallet_info_exchanger = self.wallet.get_info_exchanger()
self.download_manager.connection_manager = ConnectionManager(
self, self.rate_limiter,
[self.download_manager.blob_requester],
[self.download_manager.wallet_info_exchanger]
)
d = self.download_manager.start_downloading()
d.addCallback(lambda _: self.finished_deferred)
return d
def __init__(self, blob_dir, blob_hash, length=None):
if not is_valid_blobhash(blob_hash):
raise InvalidBlobHashError(blob_hash)
self.blob_hash = blob_hash
self.length = length
self.writers = {} # {Peer: writer, finished_deferred}
self._verified = False
self.readers = 0
self.blob_dir = blob_dir
self.file_path = os.path.join(blob_dir, self.blob_hash)
self.blob_write_lock = defer.DeferredLock()
self.saved_verified_blob = False
if os.path.isfile(self.file_path):
self.set_length(os.path.getsize(self.file_path))
# This assumes that the hash of the blob has already been
# checked as part of the blob creation process. It might
# be worth having a function that checks the actual hash;
# its probably too expensive to have that check be part of
# this call.
self._verified = True
def is_blob_request(self, request_dict):
if BLOB_HASH not in request_dict or BLOB_SIZE not in request_dict:
return False
if not is_valid_blobhash(request_dict[BLOB_HASH]):
raise InvalidBlobHashError(request_dict[BLOB_HASH])
return True
def is_descriptor_request(self, request_dict):
if SD_BLOB_HASH not in request_dict or SD_BLOB_SIZE not in request_dict:
return False
if not is_valid_blobhash(request_dict[SD_BLOB_HASH]):
raise InvalidBlobHashError(request_dict[SD_BLOB_HASH])
return True