import logging import os from twisted.internet import defer from twisted.internet.task import LoopingCall from lbryschema.fee import Fee from lbrynet.core.Error import InsufficientFundsError, KeyFeeAboveMaxAllowed from lbrynet.core.StreamDescriptor import download_sd_blob from lbrynet.file_manager.EncryptedFileDownloader import ManagedEncryptedFileDownloaderFactory from lbrynet.file_manager.EncryptedFileDownloader import ManagedEncryptedFileDownloader from lbrynet import conf INITIALIZING_CODE = 'initializing' DOWNLOAD_METADATA_CODE = 'downloading_metadata' DOWNLOAD_TIMEOUT_CODE = 'timeout' DOWNLOAD_RUNNING_CODE = 'running' DOWNLOAD_STOPPED_CODE = 'stopped' STREAM_STAGES = [ (INITIALIZING_CODE, 'Initializing'), (DOWNLOAD_METADATA_CODE, 'Downloading metadata'), (DOWNLOAD_RUNNING_CODE, 'Started stream'), (DOWNLOAD_STOPPED_CODE, 'Paused stream'), (DOWNLOAD_TIMEOUT_CODE, 'Stream timed out') ] log = logging.getLogger(__name__) def safe_start(looping_call): if not looping_call.running: looping_call.start(1) def safe_stop(looping_call): if looping_call.running: looping_call.stop() class GetStream(object): def __init__(self, sd_identifier, session, exchange_rate_manager, max_key_fee, data_rate=None, timeout=None, file_name=None): self.timeout = timeout or conf.settings['download_timeout'] self.data_rate = data_rate or conf.settings['data_rate'] self.max_key_fee = max_key_fee or conf.settings['max_key_fee'][1] self.download_directory = conf.settings['download_directory'] self.file_name = file_name self.timeout_counter = 0 self.code = None self.sd_hash = None self.session = session self.wallet = self.session.wallet self.exchange_rate_manager = exchange_rate_manager self.payment_rate_manager = self.session.payment_rate_manager self.sd_identifier = sd_identifier self.downloader = None self.checker = LoopingCall(self.check_status) # fired when the download is complete self.finished_deferred = None # fired after the metadata and the first data blob have been downloaded self.data_downloading_deferred = defer.Deferred(None) @property def download_path(self): return os.path.join(self.download_directory, self.downloader.file_name) def _check_status(self, status): stop_condition = (status.num_completed > 0 or status.running_status == ManagedEncryptedFileDownloader.STATUS_STOPPED) if stop_condition and not self.data_downloading_deferred.called: self.data_downloading_deferred.callback(True) if self.data_downloading_deferred.called: safe_stop(self.checker) else: log.info("Downloading stream data (%i seconds)", self.timeout_counter) def check_status(self): """ Check if we've got the first data blob in the stream yet """ self.timeout_counter += 1 if self.timeout_counter >= self.timeout: if not self.data_downloading_deferred.called: self.data_downloading_deferred.errback(Exception("Timeout")) safe_stop(self.checker) elif self.downloader: d = self.downloader.status() d.addCallback(self._check_status) else: log.info("Downloading stream descriptor blob (%i seconds)", self.timeout_counter) def convert_max_fee(self): currency, amount = self.max_key_fee['currency'], self.max_key_fee['amount'] return self.exchange_rate_manager.convert_currency(currency, "LBC", amount) def set_status(self, status, name): log.info("Download lbry://%s status changed to %s" % (name, status)) self.code = next(s for s in STREAM_STAGES if s[0] == status) def check_fee_and_convert(self, fee): max_key_fee_amount = self.convert_max_fee() converted_fee_amount = self.exchange_rate_manager.convert_currency(fee.currency, "LBC", fee.amount) if converted_fee_amount > self.wallet.get_balance(): raise InsufficientFundsError('Unable to pay the key fee of %s' % converted_fee_amount) if converted_fee_amount > max_key_fee_amount: raise KeyFeeAboveMaxAllowed('Key fee %s above max allowed %s' % (converted_fee_amount, max_key_fee_amount)) converted_fee = { 'currency': 'LBC', 'amount': converted_fee_amount, 'address': fee.address } return Fee(converted_fee) def get_downloader_factory(self, factories): for factory in factories: if isinstance(factory, ManagedEncryptedFileDownloaderFactory): return factory raise Exception('No suitable factory was found in {}'.format(factories)) @defer.inlineCallbacks def get_downloader(self, factory, stream_metadata): # TODO: we should use stream_metadata.options.get_downloader_options # instead of hard-coding the options to be [self.data_rate] downloader = yield factory.make_downloader( stream_metadata, [self.data_rate], self.payment_rate_manager, download_directory=self.download_directory, file_name=self.file_name ) defer.returnValue(downloader) def _pay_key_fee(self, address, fee_lbc, name): log.info("Pay key fee %f --> %s", fee_lbc, address) reserved_points = self.wallet.reserve_points(address, fee_lbc) if reserved_points is None: raise InsufficientFundsError('Unable to pay the key fee of %s for %s' % (fee_lbc, name)) return self.wallet.send_points_to_address(reserved_points, fee_lbc) @defer.inlineCallbacks def pay_key_fee(self, fee, name): if fee is not None: yield self._pay_key_fee(fee.address, fee.amount, name) else: defer.returnValue(None) @defer.inlineCallbacks def finish(self, results, name): self.set_status(DOWNLOAD_STOPPED_CODE, name) log.info("Finished downloading lbry://%s (%s) --> %s", name, self.sd_hash[:6], self.download_path) safe_stop(self.checker) status = yield self.downloader.status() self._check_status(status) defer.returnValue(self.download_path) @defer.inlineCallbacks def initialize(self, stream_info, name): # Set sd_hash and return key_fee from stream_info self.set_status(INITIALIZING_CODE, name) self.sd_hash = stream_info.source_hash key_fee = None if stream_info.has_fee: key_fee = yield self.check_fee_and_convert(stream_info.source_fee) defer.returnValue(key_fee) @defer.inlineCallbacks def _create_downloader(self, sd_blob): stream_metadata = yield self.sd_identifier.get_metadata_for_sd_blob(sd_blob) factory = self.get_downloader_factory(stream_metadata.factories) downloader = yield self.get_downloader(factory, stream_metadata) defer.returnValue(downloader) @defer.inlineCallbacks def download(self, name, key_fee): # download sd blob, and start downloader self.set_status(DOWNLOAD_METADATA_CODE, name) sd_blob = yield download_sd_blob(self.session, self.sd_hash, self.payment_rate_manager) self.downloader = yield self._create_downloader(sd_blob) self.set_status(DOWNLOAD_RUNNING_CODE, name) if key_fee: yield self.pay_key_fee(key_fee, name) log.info("Downloading lbry://%s (%s) --> %s", name, self.sd_hash[:6], self.download_path) self.finished_deferred = self.downloader.start() self.finished_deferred.addCallback(self.finish, name) @defer.inlineCallbacks def start(self, stream_info, name): """ Start download Returns: (tuple) Tuple containing (downloader, finished_deferred) downloader - instance of ManagedEncryptedFileDownloader finished_deferred - deferred callbacked when download is finished """ key_fee = yield self.initialize(stream_info, name) safe_start(self.checker) try: yield self.download(name, key_fee) except Exception as err: safe_stop(self.checker) raise try: yield self.data_downloading_deferred except Exception as err: self.downloader.stop() safe_stop(self.checker) raise defer.returnValue((self.downloader, self.finished_deferred))