146 lines
5.1 KiB
Python
146 lines
5.1 KiB
Python
import logging
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from zope.interface import implements
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from lbrynet import interfaces
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from lbrynet.core.BlobInfo import BlobInfo
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from lbrynet.core.client.BlobRequester import BlobRequester
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from lbrynet.core.client.ConnectionManager import ConnectionManager
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from lbrynet.core.client.DownloadManager import DownloadManager
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from lbrynet.core.Error import InvalidBlobHashError
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from lbrynet.core.utils import is_valid_blobhash
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from twisted.python.failure import Failure
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from twisted.internet import defer
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log = logging.getLogger(__name__)
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class SingleBlobMetadataHandler(object):
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implements(interfaces.IMetadataHandler)
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def __init__(self, blob_hash, download_manager):
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self.blob_hash = blob_hash
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self.download_manager = download_manager
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######## IMetadataHandler #########
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def get_initial_blobs(self):
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log.debug("Returning the blob info")
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return defer.succeed([BlobInfo(self.blob_hash, 0, None)])
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def final_blob_num(self):
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return 0
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class SingleProgressManager(object):
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def __init__(self, finished_callback, download_manager):
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self.finished_callback = finished_callback
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self.finished = False
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self.download_manager = download_manager
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self._next_check_if_finished = None
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def start(self):
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from twisted.internet import reactor
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assert self._next_check_if_finished is None
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self._next_check_if_finished = reactor.callLater(0, self._check_if_finished)
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return defer.succeed(True)
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def stop(self):
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if self._next_check_if_finished is not None:
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self._next_check_if_finished.cancel()
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self._next_check_if_finished = None
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return defer.succeed(True)
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def _check_if_finished(self):
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from twisted.internet import reactor
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self._next_check_if_finished = None
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if self.finished is False:
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if self.stream_position() == 1:
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self.blob_downloaded(self.download_manager.blobs[0], 0)
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else:
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self._next_check_if_finished = reactor.callLater(1, self._check_if_finished)
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def stream_position(self):
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blobs = self.download_manager.blobs
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if blobs and blobs[0].is_validated():
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return 1
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return 0
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def needed_blobs(self):
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blobs = self.download_manager.blobs
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assert len(blobs) == 1
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return [b for b in blobs.itervalues() if not b.is_validated()]
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def blob_downloaded(self, blob, blob_num):
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from twisted.internet import reactor
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log.debug("The blob %s has been downloaded. Calling the finished callback", str(blob))
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if self.finished is False:
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self.finished = True
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reactor.callLater(0, self.finished_callback, blob)
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class DummyBlobHandler(object):
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def __init__(self):
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pass
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def handle_blob(self, blob, blob_info):
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pass
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class StandaloneBlobDownloader(object):
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def __init__(self, blob_hash, blob_manager, peer_finder,
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rate_limiter, payment_rate_manager, wallet):
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self.blob_hash = blob_hash
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self.blob_manager = blob_manager
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self.peer_finder = peer_finder
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self.rate_limiter = rate_limiter
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self.payment_rate_manager = payment_rate_manager
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self.wallet = wallet
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self.download_manager = None
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self.finished_deferred = None
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def download(self):
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if not is_valid_blobhash(self.blob_hash):
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return defer.fail(Failure(InvalidBlobHashError(self.blob_hash)))
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def cancel_download(d):
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self.stop()
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self.finished_deferred = defer.Deferred(canceller=cancel_download)
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self.download_manager = DownloadManager(self.blob_manager)
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self.download_manager.blob_requester = BlobRequester(self.blob_manager, self.peer_finder,
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self.payment_rate_manager, self.wallet,
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self.download_manager)
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self.download_manager.blob_info_finder = SingleBlobMetadataHandler(self.blob_hash,
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self.download_manager)
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self.download_manager.progress_manager = SingleProgressManager(self._blob_downloaded,
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self.download_manager)
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self.download_manager.blob_handler = DummyBlobHandler()
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self.download_manager.wallet_info_exchanger = self.wallet.get_info_exchanger()
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self.download_manager.connection_manager = ConnectionManager(
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self, self.rate_limiter,
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[self.download_manager.blob_requester],
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[self.download_manager.wallet_info_exchanger]
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)
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d = self.download_manager.start_downloading()
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d.addCallback(lambda _: self.finished_deferred)
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return d
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def stop(self):
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return self.download_manager.stop_downloading()
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def _blob_downloaded(self, blob):
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self.stop()
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if not self.finished_deferred.called:
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self.finished_deferred.callback(blob)
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def insufficient_funds(self, err):
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self.stop()
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if not self.finished_deferred.called:
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self.finished_deferred.errback(err)
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