import logging from lbrynet.core.BlobInfo import BlobInfo from lbrynet.core.client.BlobRequester import BlobRequester from lbrynet.core.client.ConnectionManager import ConnectionManager from lbrynet.core.client.DownloadManager import DownloadManager from lbrynet.core.Error import InvalidBlobHashError, DownloadSDTimeout from lbrynet.core.utils import is_valid_blobhash, safe_start_looping_call, safe_stop_looping_call from twisted.python.failure import Failure from twisted.internet import defer from twisted.internet.task import LoopingCall log = logging.getLogger(__name__) class SingleBlobMetadataHandler(object): #implements(interfaces.IMetadataHandler) def __init__(self, blob_hash, download_manager): self.blob_hash = blob_hash self.download_manager = download_manager ######## IMetadataHandler ######### def get_initial_blobs(self): log.debug("Returning the blob info") return defer.succeed([BlobInfo(self.blob_hash, 0, None)]) def final_blob_num(self): return 0 class SingleProgressManager(object): def __init__(self, download_manager, finished_callback, timeout_callback, timeout): self.finished_callback = finished_callback self.timeout_callback = timeout_callback self.download_manager = download_manager self.timeout = timeout self.timeout_counter = 0 self.checker = LoopingCall(self._check_if_finished) def start(self): safe_start_looping_call(self.checker, 1) return defer.succeed(True) def stop(self): safe_stop_looping_call(self.checker) return defer.succeed(True) def _check_if_finished(self): if self.stream_position() == 1: blob_downloaded = self.download_manager.blobs[0] log.debug("The blob %s has been downloaded. Calling the finished callback", str(blob_downloaded)) safe_stop_looping_call(self.checker) self.finished_callback(blob_downloaded) elif self.timeout is not None: self.timeout_counter += 1 if self.timeout_counter >= self.timeout: safe_stop_looping_call(self.checker) self.timeout_callback() def stream_position(self): blobs = self.download_manager.blobs if blobs and blobs[0].get_is_verified(): return 1 return 0 def needed_blobs(self): blobs = self.download_manager.blobs assert len(blobs) == 1 return [b for b in blobs.values() if not b.get_is_verified()] class DummyBlobHandler(object): def __init__(self): pass def handle_blob(self, blob, blob_info): pass class StandaloneBlobDownloader(object): def __init__(self, blob_hash, blob_manager, peer_finder, rate_limiter, payment_rate_manager, wallet, timeout=None): self.blob_hash = blob_hash self.blob_manager = blob_manager self.peer_finder = peer_finder self.rate_limiter = rate_limiter self.payment_rate_manager = payment_rate_manager self.wallet = wallet self.timeout = timeout self.download_manager = None self.finished_deferred = None 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 stop(self): return self.download_manager.stop_downloading() def _blob_downloaded(self, blob): self.stop() if not self.finished_deferred.called: self.finished_deferred.callback(blob) def _download_timedout(self): self.stop() if not self.finished_deferred.called: self.finished_deferred.errback(DownloadSDTimeout(self.blob_hash)) def insufficient_funds(self, err): self.stop() if not self.finished_deferred.called: self.finished_deferred.errback(err)