forked from LBRYCommunity/lbry-sdk
292 lines
12 KiB
Python
292 lines
12 KiB
Python
"""
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Keep track of which LBRY Files are downloading and store their LBRY File specific metadata
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"""
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import logging
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import os
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from twisted.enterprise import adbapi
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from twisted.internet import defer, task, reactor
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from twisted.python.failure import Failure
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from lbrynet.core.PaymentRateManager import NegotiatedPaymentRateManager
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from lbrynet.lbryfilemanager.EncryptedFileDownloader import ManagedEncryptedFileDownloader
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from lbrynet.lbryfilemanager.EncryptedFileDownloader import ManagedEncryptedFileDownloaderFactory
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from lbrynet.lbryfile.StreamDescriptor import EncryptedFileStreamType
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from lbrynet.cryptstream.client.CryptStreamDownloader import AlreadyStoppedError
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from lbrynet.cryptstream.client.CryptStreamDownloader import CurrentlyStoppingError
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from lbrynet.core.sqlite_helpers import rerun_if_locked
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log = logging.getLogger(__name__)
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class EncryptedFileManager(object):
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"""Keeps track of currently opened LBRY Files, their options, and
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their LBRY File specific metadata.
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"""
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def __init__(self, session, stream_info_manager, sd_identifier, download_directory=None):
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self.session = session
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self.stream_info_manager = stream_info_manager
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self.sd_identifier = sd_identifier
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self.lbry_files = []
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self.sql_db = None
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if download_directory:
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self.download_directory = download_directory
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else:
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self.download_directory = os.getcwd()
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log.debug("Download directory for EncryptedFileManager: %s", str(self.download_directory))
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@defer.inlineCallbacks
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def setup(self):
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yield self._open_db()
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yield self._add_to_sd_identifier()
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yield self._start_lbry_files()
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def get_lbry_file_status(self, lbry_file):
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return self._get_lbry_file_status(lbry_file.rowid)
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def set_lbry_file_data_payment_rate(self, lbry_file, new_rate):
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return self._set_lbry_file_payment_rate(lbry_file.rowid, new_rate)
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def change_lbry_file_status(self, lbry_file, status):
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log.debug("Changing status of %s to %s", lbry_file.stream_hash, status)
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return self._change_file_status(lbry_file.rowid, status)
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def get_lbry_file_status_reports(self):
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ds = []
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for lbry_file in self.lbry_files:
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ds.append(lbry_file.status())
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dl = defer.DeferredList(ds)
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def filter_failures(status_reports):
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return [status_report for success, status_report in status_reports if success is True]
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dl.addCallback(filter_failures)
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return dl
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def _add_to_sd_identifier(self):
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downloader_factory = ManagedEncryptedFileDownloaderFactory(self)
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self.sd_identifier.add_stream_downloader_factory(
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EncryptedFileStreamType, downloader_factory)
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@defer.inlineCallbacks
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def _check_stream_is_managed(self, stream_hash):
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# check that all the streams in the stream_info_manager are also
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# tracked by lbry_file_manager and fix any streams that aren't.
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rowid = yield self._get_rowid_for_stream_hash(stream_hash)
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if rowid is not None:
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defer.returnValue(True)
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rate = self.session.base_payment_rate_manager.min_blob_data_payment_rate
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key, stream_name, file_name = yield self.stream_info_manager.get_stream_info(stream_hash)
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log.warning("Trying to fix missing lbry file for %s", stream_name.decode('hex'))
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yield self._save_lbry_file(stream_hash, rate)
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@defer.inlineCallbacks
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def _check_stream_info_manager(self):
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def _iter_streams(stream_hashes):
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for stream_hash in stream_hashes:
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yield self._check_stream_is_managed(stream_hash)
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stream_hashes = yield self.stream_info_manager.get_all_streams()
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log.debug("Checking %s streams", len(stream_hashes))
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yield defer.DeferredList(list(_iter_streams(stream_hashes)))
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@defer.inlineCallbacks
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def _start_lbry_files(self):
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def set_options_and_restore(rowid, stream_hash, options):
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b_prm = self.session.base_payment_rate_manager
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payment_rate_manager = NegotiatedPaymentRateManager(b_prm, self.session.blob_tracker)
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d = self.start_lbry_file(rowid, stream_hash, payment_rate_manager,
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blob_data_rate=options)
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d.addCallback(lambda downloader: downloader.restore())
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return d
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def log_error(err, rowid, stream_hash, options):
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log.error("An error occurred while starting a lbry file: %s", err.getErrorMessage())
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log.debug(rowid)
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log.debug(stream_hash)
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log.debug(options)
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def start_lbry_files(lbry_files_and_options):
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for rowid, stream_hash, options in lbry_files_and_options:
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d = set_options_and_restore(rowid, stream_hash, options)
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d.addErrback(lambda err: log_error(err, rowid, stream_hash, options))
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log.info("Started %i lbry files", len(self.lbry_files))
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return True
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yield self._check_stream_info_manager()
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files_and_options = yield self._get_all_lbry_files()
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yield start_lbry_files(files_and_options)
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def start_lbry_file(self, rowid, stream_hash,
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payment_rate_manager, blob_data_rate=None, upload_allowed=True,
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download_directory=None, file_name=None):
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if not download_directory:
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download_directory = self.download_directory
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payment_rate_manager.min_blob_data_payment_rate = blob_data_rate
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lbry_file_downloader = ManagedEncryptedFileDownloader(rowid, stream_hash,
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self.session.peer_finder,
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self.session.rate_limiter,
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self.session.blob_manager,
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self.stream_info_manager, self,
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payment_rate_manager, self.session.wallet,
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download_directory,
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upload_allowed,
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file_name=file_name)
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self.lbry_files.append(lbry_file_downloader)
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d = lbry_file_downloader.set_stream_info()
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d.addCallback(lambda _: lbry_file_downloader)
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return d
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def add_lbry_file(self, stream_hash, payment_rate_manager,
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blob_data_rate=None,
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upload_allowed=True,
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download_directory=None,
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file_name=None):
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d = self._save_lbry_file(stream_hash, blob_data_rate)
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d.addCallback(
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lambda rowid: self.start_lbry_file(
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rowid, stream_hash, payment_rate_manager,
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blob_data_rate, upload_allowed, download_directory, file_name))
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return d
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def delete_lbry_file(self, lbry_file):
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for l in self.lbry_files:
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if l == lbry_file:
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lbry_file = l
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break
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else:
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return defer.fail(Failure(ValueError("Could not find that LBRY file")))
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def wait_for_finished(count=2):
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if count <= 0 or lbry_file.saving_status is False:
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return True
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else:
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return task.deferLater(reactor, 1, wait_for_finished, count=count - 1)
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def ignore_stopped(err):
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err.trap(AlreadyStoppedError, CurrentlyStoppingError)
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return wait_for_finished()
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d = lbry_file.stop()
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d.addErrback(ignore_stopped)
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def remove_from_list():
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self.lbry_files.remove(lbry_file)
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d.addCallback(lambda _: remove_from_list())
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d.addCallback(lambda _: self._delete_lbry_file_options(lbry_file.rowid))
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return d
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def toggle_lbry_file_running(self, lbry_file):
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"""Toggle whether a stream reader is currently running"""
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for l in self.lbry_files:
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if l == lbry_file:
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return l.toggle_running()
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else:
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return defer.fail(Failure(ValueError("Could not find that LBRY file")))
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def stop(self):
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log.info('Stopping %s', self)
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ds = []
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def wait_for_finished(lbry_file, count=2):
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if count <= 0 or lbry_file.saving_status is False:
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return True
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else:
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return task.deferLater(reactor, 1, wait_for_finished, lbry_file, count=count - 1)
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def ignore_stopped(err, lbry_file):
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err.trap(AlreadyStoppedError, CurrentlyStoppingError)
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return wait_for_finished(lbry_file)
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for lbry_file in self.lbry_files:
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d = lbry_file.stop(change_status=False)
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d.addErrback(ignore_stopped, lbry_file)
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ds.append(d)
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dl = defer.DeferredList(ds)
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def close_db():
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self.db = None
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dl.addCallback(lambda _: close_db())
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return dl
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def get_count_for_stream_hash(self, stream_hash):
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return self._get_count_for_stream_hash(stream_hash)
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######### database calls #########
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def _open_db(self):
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# check_same_thread=False is solely to quiet a spurious error that appears to be due
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# to a bug in twisted, where the connection is closed by a different thread than the
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# one that opened it. The individual connections in the pool are not used in multiple
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# threads.
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self.sql_db = adbapi.ConnectionPool(
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"sqlite3",
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os.path.join(self.session.db_dir, "lbryfile_info.db"),
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check_same_thread=False
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)
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return self.sql_db.runQuery(
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"create table if not exists lbry_file_options (" +
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" blob_data_rate real, " +
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" status text," +
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" stream_hash text,"
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" foreign key(stream_hash) references lbry_files(stream_hash)" +
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")"
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)
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@rerun_if_locked
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def _save_lbry_file(self, stream_hash, data_payment_rate):
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def do_save(db_transaction):
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db_transaction.execute("insert into lbry_file_options values (?, ?, ?)",
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(data_payment_rate, ManagedEncryptedFileDownloader.STATUS_STOPPED,
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stream_hash))
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return db_transaction.lastrowid
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return self.sql_db.runInteraction(do_save)
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@rerun_if_locked
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def _delete_lbry_file_options(self, rowid):
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return self.sql_db.runQuery("delete from lbry_file_options where rowid = ?",
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(rowid,))
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@rerun_if_locked
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def _set_lbry_file_payment_rate(self, rowid, new_rate):
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return self.sql_db.runQuery(
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"update lbry_file_options set blob_data_rate = ? where rowid = ?",
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(new_rate, rowid))
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@rerun_if_locked
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def _get_all_lbry_files(self):
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d = self.sql_db.runQuery("select rowid, stream_hash, blob_data_rate from lbry_file_options")
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return d
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@rerun_if_locked
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def _change_file_status(self, rowid, new_status):
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return self.sql_db.runQuery("update lbry_file_options set status = ? where rowid = ?",
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(new_status, rowid))
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@rerun_if_locked
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def _get_lbry_file_status(self, rowid):
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d = self.sql_db.runQuery("select status from lbry_file_options where rowid = ?",
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(rowid,))
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d.addCallback(lambda r: (r[0][0] if len(r) else None))
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return d
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@rerun_if_locked
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def _get_count_for_stream_hash(self, stream_hash):
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return self.sql_db.runQuery("select count(*) from lbry_file_options where stream_hash = ?",
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(stream_hash,))
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@rerun_if_locked
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def _get_rowid_for_stream_hash(self, stream_hash):
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d = self.sql_db.runQuery("select rowid from lbry_file_options where stream_hash = ?",
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(stream_hash,))
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d.addCallback(lambda r: (r[0][0] if len(r) else None))
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return d
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