forked from LBRYCommunity/lbry-sdk
179 lines
7 KiB
Python
179 lines
7 KiB
Python
"""
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Download LBRY Files from LBRYnet and save them to disk.
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"""
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import logging
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from zope.interface import implements
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from twisted.internet import defer
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from lbrynet.core.client.StreamProgressManager import FullStreamProgressManager
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from lbrynet.core.Error import NoSuchStreamHash
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from lbrynet.core.utils import short_hash
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from lbrynet.core.StreamDescriptor import StreamMetadata
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from lbrynet.lbry_file.client.EncryptedFileDownloader import EncryptedFileSaver
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from lbrynet.lbry_file.client.EncryptedFileDownloader import EncryptedFileDownloader
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from lbrynet.file_manager.EncryptedFileStatusReport import EncryptedFileStatusReport
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from lbrynet.interfaces import IStreamDownloaderFactory
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from lbrynet.lbry_file.StreamDescriptor import save_sd_info
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log = logging.getLogger(__name__)
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def log_status(sd_hash, status):
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if status == ManagedEncryptedFileDownloader.STATUS_RUNNING:
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status_string = "running"
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elif status == ManagedEncryptedFileDownloader.STATUS_STOPPED:
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status_string = "stopped"
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elif status == ManagedEncryptedFileDownloader.STATUS_FINISHED:
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status_string = "finished"
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else:
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status_string = "unknown"
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log.info("stream %s is %s", short_hash(sd_hash), status_string)
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class ManagedEncryptedFileDownloader(EncryptedFileSaver):
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STATUS_RUNNING = "running"
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STATUS_STOPPED = "stopped"
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STATUS_FINISHED = "finished"
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def __init__(self, rowid, stream_hash, peer_finder, rate_limiter,
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blob_manager, stream_info_manager, lbry_file_manager,
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payment_rate_manager, wallet, download_directory,
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file_name=None):
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EncryptedFileSaver.__init__(self, stream_hash, peer_finder,
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rate_limiter, blob_manager,
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stream_info_manager,
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payment_rate_manager, wallet,
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download_directory,
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file_name)
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self.sd_hash = None
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self.rowid = rowid
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self.lbry_file_manager = lbry_file_manager
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self._saving_status = False
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@property
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def saving_status(self):
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return self._saving_status
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@defer.inlineCallbacks
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def restore(self):
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yield self.load_file_attributes()
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status = yield self.lbry_file_manager.get_lbry_file_status(self)
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log_status(self.sd_hash, status)
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if status == ManagedEncryptedFileDownloader.STATUS_RUNNING:
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# start returns self.finished_deferred
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# which fires when we've finished downloading the file
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# and we don't want to wait for the entire download
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self.start()
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elif status == ManagedEncryptedFileDownloader.STATUS_STOPPED:
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defer.returnValue(False)
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elif status == ManagedEncryptedFileDownloader.STATUS_FINISHED:
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self.completed = True
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defer.returnValue(True)
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else:
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raise Exception("Unknown status for stream %s: %s" % (self.stream_hash, status))
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@defer.inlineCallbacks
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def stop(self, err=None, change_status=True):
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log.debug('Stopping download for stream %s', short_hash(self.stream_hash))
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# EncryptedFileSaver deletes metadata when it's stopped. We don't want that here.
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yield EncryptedFileDownloader.stop(self, err=err)
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if change_status is True:
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status = yield self._save_status()
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defer.returnValue(status)
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@defer.inlineCallbacks
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def status(self):
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blobs = yield self.stream_info_manager.get_blobs_for_stream(self.stream_hash)
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blob_hashes = [b[0] for b in blobs if b[0] is not None]
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completed_blobs = yield self.blob_manager.completed_blobs(blob_hashes)
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num_blobs_completed = len(completed_blobs)
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num_blobs_known = len(blob_hashes)
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if self.completed:
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status = "completed"
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elif self.stopped:
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status = "stopped"
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else:
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status = "running"
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defer.returnValue(EncryptedFileStatusReport(self.file_name, num_blobs_completed,
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num_blobs_known, status))
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@defer.inlineCallbacks
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def load_file_attributes(self, sd_hash=None):
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if not sd_hash:
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sd_hash = yield self.stream_info_manager.get_sd_blob_hashes_for_stream(self.stream_hash)
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if sd_hash:
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self.sd_hash = sd_hash[0]
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else:
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raise NoSuchStreamHash(self.stream_hash)
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else:
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self.sd_hash = sd_hash
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defer.returnValue(None)
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@defer.inlineCallbacks
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def _start(self):
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yield EncryptedFileSaver._start(self)
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yield self.load_file_attributes()
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status = yield self._save_status()
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log_status(self.sd_hash, status)
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defer.returnValue(status)
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def _get_finished_deferred_callback_value(self):
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if self.completed is True:
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return "Download successful"
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else:
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return "Download stopped"
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@defer.inlineCallbacks
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def _save_status(self):
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self._saving_status = True
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if self.completed is True:
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status = ManagedEncryptedFileDownloader.STATUS_FINISHED
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elif self.stopped is True:
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status = ManagedEncryptedFileDownloader.STATUS_STOPPED
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else:
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status = ManagedEncryptedFileDownloader.STATUS_RUNNING
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status = yield self.lbry_file_manager.change_lbry_file_status(self, status)
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self._saving_status = False
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defer.returnValue(status)
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def save_status(self):
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return self._save_status()
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def _get_progress_manager(self, download_manager):
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return FullStreamProgressManager(self._finished_downloading,
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self.blob_manager, download_manager)
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class ManagedEncryptedFileDownloaderFactory(object):
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implements(IStreamDownloaderFactory)
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def __init__(self, lbry_file_manager):
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self.lbry_file_manager = lbry_file_manager
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def can_download(self, sd_validator):
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# TODO: add a sd_validator for non live streams, use it
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return True
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@defer.inlineCallbacks
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def make_downloader(self, metadata, options, payment_rate_manager, download_directory=None,
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file_name=None):
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assert len(options) == 1
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data_rate = options[0]
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stream_hash = yield save_sd_info(self.lbry_file_manager.stream_info_manager,
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metadata.validator.raw_info)
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if metadata.metadata_source == StreamMetadata.FROM_BLOB:
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yield self.lbry_file_manager.save_sd_blob_hash_to_stream(stream_hash,
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metadata.source_blob_hash)
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lbry_file = yield self.lbry_file_manager.add_lbry_file(stream_hash, payment_rate_manager,
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data_rate,
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download_directory, file_name)
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defer.returnValue(lbry_file)
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@staticmethod
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def get_description():
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return "Save the file to disk"
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