lbry-sdk/lbrynet/lbryfilemanager/EncryptedFileManager.py

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"""
Keep track of which LBRY Files are downloading and store their LBRY File specific metadata
"""
import logging
import os
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from twisted.enterprise import adbapi
from twisted.internet import defer, task, reactor
from twisted.python.failure import Failure
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from lbrynet.core.PaymentRateManager import NegotiatedPaymentRateManager
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from lbrynet.lbryfilemanager.EncryptedFileDownloader import ManagedEncryptedFileDownloader
from lbrynet.lbryfilemanager.EncryptedFileDownloader import ManagedEncryptedFileDownloaderFactory
from lbrynet.lbryfile.StreamDescriptor import EncryptedFileStreamType
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from lbrynet.cryptstream.client.CryptStreamDownloader import AlreadyStoppedError, CurrentlyStoppingError
from lbrynet.core.sqlite_helpers import rerun_if_locked
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log = logging.getLogger(__name__)
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class EncryptedFileManager(object):
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"""
Keeps track of currently opened LBRY Files, their options, and their LBRY File specific metadata.
"""
def __init__(self, session, stream_info_manager, sd_identifier, download_directory=None):
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self.session = session
self.stream_info_manager = stream_info_manager
self.sd_identifier = sd_identifier
self.lbry_files = []
self.sql_db = None
if download_directory:
self.download_directory = download_directory
else:
self.download_directory = os.getcwd()
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log.debug("Download directory for EncryptedFileManager: %s", str(self.download_directory))
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def setup(self):
d = self._open_db()
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d.addCallback(lambda _: self._add_to_sd_identifier())
d.addCallback(lambda _: self._start_lbry_files())
return d
def get_lbry_file_status(self, lbry_file):
return self._get_lbry_file_status(lbry_file.rowid)
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def set_lbry_file_data_payment_rate(self, lbry_file, new_rate):
return self._set_lbry_file_payment_rate(lbry_file.rowid, new_rate)
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def change_lbry_file_status(self, lbry_file, status):
log.debug("Changing status of %s to %s", lbry_file.stream_hash, status)
return self._change_file_status(lbry_file.rowid, status)
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def get_lbry_file_status_reports(self):
ds = []
for lbry_file in self.lbry_files:
ds.append(lbry_file.status())
dl = defer.DeferredList(ds)
def filter_failures(status_reports):
return [status_report for success, status_report in status_reports if success is True]
dl.addCallback(filter_failures)
return dl
def _add_to_sd_identifier(self):
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downloader_factory = ManagedEncryptedFileDownloaderFactory(self)
self.sd_identifier.add_stream_downloader_factory(EncryptedFileStreamType, downloader_factory)
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def _start_lbry_files(self):
def set_options_and_restore(rowid, stream_hash, options):
payment_rate_manager = NegotiatedPaymentRateManager(self.session.base_payment_rate_manager,
self.session.blob_tracker)
d = self.start_lbry_file(rowid, stream_hash, payment_rate_manager,
blob_data_rate=options)
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d.addCallback(lambda downloader: downloader.restore())
return d
def log_error(err, rowid, stream_hash, options):
log.error("An error occurred while starting a lbry file: %s", err.getErrorMessage())
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log.debug(rowid)
log.debug(stream_hash)
log.debug(options)
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def start_lbry_files(lbry_files_and_options):
for rowid, stream_hash, options in lbry_files_and_options:
d = set_options_and_restore(rowid, stream_hash, options)
d.addErrback(lambda err: log_error(err, rowid, stream_hash, options))
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return True
d = self._get_all_lbry_files()
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d.addCallback(start_lbry_files)
return d
def start_lbry_file(self, rowid, stream_hash, payment_rate_manager, blob_data_rate=None, upload_allowed=True,
download_directory=None, file_name=None):
if not download_directory:
download_directory = self.download_directory
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payment_rate_manager.min_blob_data_payment_rate = blob_data_rate
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lbry_file_downloader = ManagedEncryptedFileDownloader(rowid, stream_hash,
self.session.peer_finder,
self.session.rate_limiter,
self.session.blob_manager,
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self.stream_info_manager, self,
payment_rate_manager, self.session.wallet,
download_directory,
upload_allowed,
file_name=file_name)
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self.lbry_files.append(lbry_file_downloader)
d = lbry_file_downloader.set_stream_info()
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d.addCallback(lambda _: lbry_file_downloader)
return d
def add_lbry_file(self, stream_hash, payment_rate_manager, blob_data_rate=None, upload_allowed=True,
download_directory=None, file_name=None):
d = self._save_lbry_file(stream_hash, blob_data_rate)
d.addCallback(lambda rowid: self.start_lbry_file(rowid, stream_hash, payment_rate_manager,
blob_data_rate, upload_allowed, download_directory, file_name))
return d
def delete_lbry_file(self, lbry_file):
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for l in self.lbry_files:
if l == lbry_file:
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lbry_file = l
break
else:
return defer.fail(Failure(ValueError("Could not find that LBRY file")))
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def wait_for_finished(count=2):
if count <= 0 or lbry_file.saving_status is False:
return True
else:
return task.deferLater(reactor, 1, wait_for_finished, count=count - 1)
def ignore_stopped(err):
err.trap(AlreadyStoppedError, CurrentlyStoppingError)
return wait_for_finished()
d = lbry_file.stop()
d.addErrback(ignore_stopped)
def remove_from_list():
self.lbry_files.remove(lbry_file)
d.addCallback(lambda _: remove_from_list())
d.addCallback(lambda _: self._delete_lbry_file_options(lbry_file.rowid))
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return d
def toggle_lbry_file_running(self, lbry_file):
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"""Toggle whether a stream reader is currently running"""
for l in self.lbry_files:
if l == lbry_file:
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return l.toggle_running()
else:
return defer.fail(Failure(ValueError("Could not find that LBRY file")))
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def stop(self):
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log.info('Stopping %s', self)
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ds = []
def wait_for_finished(lbry_file, count=2):
if count <= 0 or lbry_file.saving_status is False:
return True
else:
return task.deferLater(reactor, 1, wait_for_finished, lbry_file, count=count - 1)
def ignore_stopped(err, lbry_file):
err.trap(AlreadyStoppedError, CurrentlyStoppingError)
return wait_for_finished(lbry_file)
for lbry_file in self.lbry_files:
d = lbry_file.stop(change_status=False)
d.addErrback(ignore_stopped, lbry_file)
ds.append(d)
dl = defer.DeferredList(ds)
def close_db():
self.db = None
dl.addCallback(lambda _: close_db())
return dl
def get_count_for_stream_hash(self, stream_hash):
return self._get_count_for_stream_hash(stream_hash)
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######### database calls #########
def _open_db(self):
# check_same_thread=False is solely to quiet a spurious error that appears to be due
# to a bug in twisted, where the connection is closed by a different thread than the
# one that opened it. The individual connections in the pool are not used in multiple
# threads.
self.sql_db = adbapi.ConnectionPool("sqlite3", os.path.join(self.session.db_dir, "lbryfile_info.db"),
check_same_thread=False)
return self.sql_db.runQuery("create table if not exists lbry_file_options (" +
" blob_data_rate real, " +
" status text," +
" stream_hash text,"
" foreign key(stream_hash) references lbry_files(stream_hash)" +
")")
@rerun_if_locked
def _save_lbry_file(self, stream_hash, data_payment_rate):
def do_save(db_transaction):
db_transaction.execute("insert into lbry_file_options values (?, ?, ?)",
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(data_payment_rate, ManagedEncryptedFileDownloader.STATUS_STOPPED,
stream_hash))
return db_transaction.lastrowid
return self.sql_db.runInteraction(do_save)
@rerun_if_locked
def _delete_lbry_file_options(self, rowid):
return self.sql_db.runQuery("delete from lbry_file_options where rowid = ?",
(rowid,))
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@rerun_if_locked
def _set_lbry_file_payment_rate(self, rowid, new_rate):
return self.sql_db.runQuery("update lbry_file_options set blob_data_rate = ? where rowid = ?",
(new_rate, rowid))
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@rerun_if_locked
def _get_all_lbry_files(self):
d = self.sql_db.runQuery("select rowid, stream_hash, blob_data_rate from lbry_file_options")
return d
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@rerun_if_locked
def _change_file_status(self, rowid, new_status):
return self.sql_db.runQuery("update lbry_file_options set status = ? where rowid = ?",
(new_status, rowid))
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@rerun_if_locked
def _get_lbry_file_status(self, rowid):
d = self.sql_db.runQuery("select status from lbry_file_options where rowid = ?",
(rowid,))
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d.addCallback(lambda r: r[0][0] if len(r) else ManagedEncryptedFileDownloader.STATUS_STOPPED)
return d
@rerun_if_locked
def _get_count_for_stream_hash(self, stream_hash):
return self.sql_db.runQuery("select count(*) from lbry_file_options where stream_hash = ?",
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(stream_hash,))