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)
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.download_manager, self._blob_downloaded,
self._download_timedout, self.timeout)
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 get_files_in_blob_dir() -> typing.Set[str]:
if not self.blob_dir:
return set()
return {
item.name
for item in os.scandir(self.blob_dir)
if is_valid_blobhash(item.name)
}
def is_blob_verified(self, blob_hash: str, length: typing.Optional[int] = None) -> bool:
if not is_valid_blobhash(blob_hash):
raise ValueError(blob_hash)
if blob_hash in self.blobs:
return self.blobs[blob_hash].get_is_verified()
if not os.path.isfile(os.path.join(self.blob_dir, blob_hash)):
return False
return self._get_blob(blob_hash, length).get_is_verified()
def _get_blob(self, blob_hash: str, length: typing.Optional[int] = None):
if self.config.save_blobs:
return BlobFile(self.loop, blob_hash, length, self.blob_completed,
self.blob_dir)
else:
if is_valid_blobhash(blob_hash) and os.path.isfile(
os.path.join(self.blob_dir, blob_hash)):
return BlobFile(self.loop, blob_hash, length,
self.blob_completed, self.blob_dir)
return BlobBuffer(self.loop, blob_hash, length,
self.blob_completed, self.blob_dir)
def delete_blob(self, blob_hash: str):
if not is_valid_blobhash(blob_hash):
raise Exception("invalid blob hash to delete")
if blob_hash not in self.blobs:
if os.path.isfile(os.path.join(self.blob_dir, blob_hash)):
os.remove(os.path.join(self.blob_dir, blob_hash))
else:
self.blobs.pop(blob_hash).delete()
if blob_hash in self.completed_blob_hashes:
self.completed_blob_hashes.remove(blob_hash)
def initialize_blob_hashes():
self.completed_blob_hashes.update(
item.name for item in os.scandir(self.blob_dir)
if is_valid_blobhash(item.name))
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