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