forked from LBRYCommunity/lbry-sdk
172 lines
7.2 KiB
Python
172 lines
7.2 KiB
Python
import logging
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import os
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from copy import deepcopy
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from twisted.internet import defer
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from twisted.internet.task import LoopingCall
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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.metadata.Fee import FeeValidator
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from lbrynet.lbryfilemanager.EncryptedFileDownloader import ManagedEncryptedFileDownloaderFactory
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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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# TODO: is this ever used?
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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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class GetStream(object):
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def __init__(self, sd_identifier, session, wallet,
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lbry_file_manager, exchange_rate_manager,
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max_key_fee, data_rate=0.5, timeout=None,
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download_directory=None, file_name=None):
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if timeout is None:
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timeout = conf.settings['download_timeout']
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self.wallet = wallet
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self.resolved_name = None
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self.description = None
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self.fee = None
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self.data_rate = data_rate
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self.file_name = file_name
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self.session = session
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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.lbry_file_manager = lbry_file_manager
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self.sd_identifier = sd_identifier
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self.sd_hash = None
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self.max_key_fee = max_key_fee
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self.stream_info = None
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self.stream_info_manager = None
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self._d = defer.Deferred(None)
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self.timeout = timeout
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self.timeout_counter = 0
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self.download_directory = download_directory
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self.download_path = None
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self.downloader = None
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# fired after the metadata has been downloaded and the
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# actual file has been started
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self.finished = defer.Deferred(None)
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self.checker = LoopingCall(self.check_status)
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self.code = STREAM_STAGES[0]
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def check_status(self):
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self.timeout_counter += 1
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# download_path is set after the sd blob has been downloaded
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if self.download_path:
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self.checker.stop()
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self.finished.callback((True, self.sd_hash, self.download_path))
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elif self.timeout_counter >= self.timeout:
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log.info("Timeout downloading lbry://%s", self.resolved_name)
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self.checker.stop()
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self._d.cancel()
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self.code = STREAM_STAGES[4]
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self.finished.callback((False, None, None))
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def _convert_max_fee(self):
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max_fee = FeeValidator(self.max_key_fee)
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if max_fee.currency_symbol == "LBC":
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return max_fee.amount
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return self.exchange_rate_manager.to_lbc(self.max_key_fee).amount
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def start(self, stream_info, name):
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def _cancel(err):
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# this callback sequence gets cancelled in check_status if
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# it takes too long when that happens, we want the logic
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# to live in check_status
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if err.check(defer.CancelledError):
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return
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if self.checker:
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self.checker.stop()
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self.finished.errback(err)
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def _set_status(x, status):
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log.info("Download lbry://%s status changed to %s" % (self.resolved_name, status))
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self.code = next(s for s in STREAM_STAGES if s[0] == status)
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return x
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def get_downloader_factory(metadata):
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for factory in metadata.factories:
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if isinstance(factory, ManagedEncryptedFileDownloaderFactory):
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return factory, metadata
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raise Exception('No suitable factory was found in {}'.format(metadata.factories))
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def make_downloader(args):
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factory, metadata = args
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return factory.make_downloader(metadata,
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[self.data_rate, True],
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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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self.resolved_name = name
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self.stream_info = deepcopy(stream_info)
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self.description = self.stream_info['description']
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self.sd_hash = self.stream_info['sources']['lbry_sd_hash']
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if 'fee' in self.stream_info:
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self.fee = FeeValidator(self.stream_info['fee'])
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max_key_fee = self._convert_max_fee()
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converted_fee = self.exchange_rate_manager.to_lbc(self.fee).amount
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if converted_fee > self.wallet.get_balance():
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msg = "Insufficient funds to download lbry://{}. Need {:0.2f}, have {:0.2f}".format(
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self.resolved_name, converted_fee, self.wallet.get_balance())
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raise InsufficientFundsError(msg)
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if converted_fee > max_key_fee:
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msg = "Key fee {:0.2f} above limit of {:0.2f} didn't download lbry://{}".format(
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converted_fee, max_key_fee, self.resolved_name)
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raise KeyFeeAboveMaxAllowed(msg)
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log.info(
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"Key fee %f below limit of %f, downloading lbry://%s",
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converted_fee, max_key_fee, self.resolved_name)
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self.checker.start(1)
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self._d.addCallback(lambda _: _set_status(None, DOWNLOAD_METADATA_CODE))
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self._d.addCallback(lambda _: download_sd_blob(
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self.session, self.sd_hash, self.payment_rate_manager))
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self._d.addCallback(self.sd_identifier.get_metadata_for_sd_blob)
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self._d.addCallback(lambda r: _set_status(r, DOWNLOAD_RUNNING_CODE))
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self._d.addCallback(get_downloader_factory)
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self._d.addCallback(make_downloader)
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self._d.addCallbacks(self._start_download, _cancel)
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self._d.callback(None)
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return self.finished
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def _start_download(self, downloader):
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log.info('Starting download for %s', self.resolved_name)
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self.downloader = downloader
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self.download_path = os.path.join(downloader.download_directory, downloader.file_name)
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d = self._pay_key_fee()
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d.addCallback(lambda _: log.info(
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"Downloading %s --> %s", self.sd_hash, self.downloader.file_name))
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d.addCallback(lambda _: self.downloader.start())
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def _pay_key_fee(self):
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if self.fee is not None:
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fee_lbc = self.exchange_rate_manager.to_lbc(self.fee).amount
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reserved_points = self.wallet.reserve_points(self.fee.address, fee_lbc)
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if reserved_points is None:
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log.warning('Unable to pay the key fee of %s for %s', fee_lbc, self.resolved_name)
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# TODO: If we get here, nobody will know that there was an error
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# as nobody actually cares about self._d
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return defer.fail(InsufficientFundsError())
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return self.wallet.send_points_to_address(reserved_points, fee_lbc)
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return defer.succeed(None)
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