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.Error import DownloadDataTimeout, DownloadCanceledError, DownloadSDTimeout from lbrynet.core.utils import safe_start_looping_call, safe_stop_looping_call from lbrynet.core.StreamDescriptor import download_sd_blob from lbrynet.file_manager.EncryptedFileDownloader import ManagedEncryptedFileDownloaderFactory 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__) class GetStream(object): def __init__(self, sd_identifier, session, exchange_rate_manager, max_key_fee, disable_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.disable_max_key_fee = disable_max_key_fee or conf.settings['disable_max_key_fee'] 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): if status.num_completed > 0 and not self.data_downloading_deferred.called: self.data_downloading_deferred.callback(True) if self.data_downloading_deferred.called: safe_stop_looping_call(self.checker) else: log.debug("Waiting for 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: if self.downloader: err = DownloadDataTimeout(self.sd_hash) else: err = DownloadSDTimeout(self.sd_hash) self.data_downloading_deferred.errback(err) safe_stop_looping_call(self.checker) elif self.downloader: d = self.downloader.status() d.addCallback(self._check_status) else: log.debug("Waiting for stream descriptor (%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 and not self.disable_max_key_fee: 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_looping_call(self.checker) status = yield self.downloader.status() self._check_status(status) defer.returnValue(self.download_path) def fail(self, err): safe_stop_looping_call(self.checker) raise err @defer.inlineCallbacks def _initialize(self, stream_info): # Set sd_hash and return key_fee from stream_info 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_sd_blob(self): sd_blob = yield download_sd_blob(self.session, self.sd_hash, self.payment_rate_manager, self.timeout) defer.returnValue(sd_blob) @defer.inlineCallbacks def _download(self, sd_blob, name, key_fee): self.downloader = yield self._create_downloader(sd_blob) 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.addCallbacks(lambda result: self.finish(result, name), self.fail) @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 """ self.set_status(INITIALIZING_CODE, name) key_fee = yield self._initialize(stream_info) safe_start_looping_call(self.checker, 1) self.set_status(DOWNLOAD_METADATA_CODE, name) sd_blob = yield self._download_sd_blob() yield self._download(sd_blob, name, key_fee) self.set_status(DOWNLOAD_RUNNING_CODE, name) try: yield self.data_downloading_deferred except DownloadDataTimeout as err: safe_stop_looping_call(self.checker) raise err defer.returnValue((self.downloader, self.finished_deferred)) def cancel(self, reason=None): if reason: msg = "download stream cancelled: %s" % reason else: msg = "download stream cancelled" if self.data_downloading_deferred and not self.data_downloading_deferred.called: self.data_downloading_deferred.errback(DownloadCanceledError(msg))