228 lines
8.6 KiB
Python
228 lines
8.6 KiB
Python
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))
|
|
|