forked from LBRYCommunity/lbry-sdk
407 lines
19 KiB
Python
407 lines
19 KiB
Python
import os
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import asyncio
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import typing
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import binascii
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import logging
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import random
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from lbrynet.error import ResolveError, InvalidStreamDescriptorError
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from lbrynet.stream.downloader import StreamDownloader
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from lbrynet.stream.managed_stream import ManagedStream
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from lbrynet.schema.claim import ClaimDict
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from lbrynet.schema.uri import parse_lbry_uri
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from lbrynet.schema.decode import smart_decode
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from lbrynet.extras.daemon.storage import lbc_to_dewies
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if typing.TYPE_CHECKING:
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from lbrynet.conf import Config
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from lbrynet.blob.blob_manager import BlobFileManager
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from lbrynet.dht.node import Node
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from lbrynet.extras.daemon.storage import SQLiteStorage
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from lbrynet.extras.wallet import LbryWalletManager
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from lbrynet.extras.daemon.exchange_rate_manager import ExchangeRateManager
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log = logging.getLogger(__name__)
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filter_fields = [
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'status',
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'file_name',
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'sd_hash',
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'stream_hash',
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'claim_name',
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'claim_height',
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'claim_id',
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'outpoint',
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'txid',
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'nout',
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'channel_claim_id',
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'channel_name',
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'full_status', # TODO: remove
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'blobs_remaining',
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'blobs_in_stream'
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]
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comparison_operators = {
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'eq': lambda a, b: a == b,
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'ne': lambda a, b: a != b,
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'g': lambda a, b: a > b,
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'l': lambda a, b: a < b,
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'ge': lambda a, b: a >= b,
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'le': lambda a, b: a <= b,
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}
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class StreamManager:
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def __init__(self, loop: asyncio.BaseEventLoop, config: 'Config', blob_manager: 'BlobFileManager',
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wallet: 'LbryWalletManager', storage: 'SQLiteStorage', node: typing.Optional['Node']):
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self.loop = loop
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self.config = config
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self.blob_manager = blob_manager
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self.wallet = wallet
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self.storage = storage
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self.node = node
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self.streams: typing.Set[ManagedStream] = set()
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self.starting_streams: typing.Dict[str, asyncio.Future] = {}
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self.resume_downloading_task: asyncio.Task = None
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self.re_reflect_task: asyncio.Task = None
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self.update_stream_finished_futs: typing.List[asyncio.Future] = []
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async def _update_content_claim(self, stream: ManagedStream):
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claim_info = await self.storage.get_content_claim(stream.stream_hash)
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stream.set_claim(claim_info, smart_decode(claim_info['value']))
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async def start_stream(self, stream: ManagedStream) -> bool:
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"""
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Resume or rebuild a partial or completed stream
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"""
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path = os.path.join(stream.download_directory, stream.file_name)
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if not stream.running and not os.path.isfile(path):
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if stream.downloader:
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stream.downloader.stop()
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stream.downloader = None
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# the directory is gone, can happen when the folder that contains a published file is deleted
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# reset the download directory to the default and update the file name
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if not os.path.isdir(stream.download_directory):
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stream.download_directory = self.config.download_dir
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stream.downloader = self.make_downloader(
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stream.sd_hash, stream.download_directory, stream.descriptor.suggested_file_name
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)
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if stream.status != ManagedStream.STATUS_FINISHED:
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await self.storage.change_file_status(stream.stream_hash, 'running')
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stream.update_status('running')
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stream.start_download(self.node)
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try:
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await asyncio.wait_for(self.loop.create_task(stream.downloader.got_descriptor.wait()),
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self.config.download_timeout)
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except asyncio.TimeoutError:
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await self.stop_stream(stream)
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if stream in self.streams:
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self.streams.remove(stream)
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return False
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file_name = os.path.basename(stream.downloader.output_path)
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await self.storage.change_file_download_dir_and_file_name(
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stream.stream_hash, self.config.download_dir, file_name
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)
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self.wait_for_stream_finished(stream)
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return True
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return True
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async def stop_stream(self, stream: ManagedStream):
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stream.stop_download()
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if not stream.finished and os.path.isfile(stream.full_path):
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try:
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os.remove(stream.full_path)
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except OSError as err:
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log.warning("Failed to delete partial download %s from downloads directory: %s", stream.full_path,
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str(err))
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if stream.running:
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stream.update_status(ManagedStream.STATUS_STOPPED)
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await self.storage.change_file_status(stream.stream_hash, ManagedStream.STATUS_STOPPED)
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def make_downloader(self, sd_hash: str, download_directory: str, file_name: str):
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return StreamDownloader(
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self.loop, self.config, self.blob_manager, sd_hash, download_directory, file_name
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)
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async def add_stream(self, sd_hash: str, file_name: str, download_directory: str, status: str, claim):
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sd_blob = self.blob_manager.get_blob(sd_hash)
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if sd_blob.get_is_verified():
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try:
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descriptor = await self.blob_manager.get_stream_descriptor(sd_blob.blob_hash)
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except InvalidStreamDescriptorError as err:
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log.warning("Failed to start stream for sd %s - %s", sd_hash, str(err))
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return
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downloader = self.make_downloader(descriptor.sd_hash, download_directory, file_name)
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stream = ManagedStream(
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self.loop, self.blob_manager, descriptor, download_directory, file_name, downloader, status, claim
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)
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self.streams.add(stream)
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self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream)
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async def load_streams_from_database(self):
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log.info("Initializing stream manager from %s", self.storage._db_path)
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file_infos = await self.storage.get_all_lbry_files()
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log.info("Initializing %i files", len(file_infos))
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await asyncio.gather(*[
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self.add_stream(
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file_info['sd_hash'], binascii.unhexlify(file_info['file_name']).decode(),
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binascii.unhexlify(file_info['download_directory']).decode(), file_info['status'], file_info['claim']
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) for file_info in file_infos
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])
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log.info("Started stream manager with %i files", len(file_infos))
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async def resume(self):
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if not self.node:
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log.warning("no DHT node given, cannot resume downloads")
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return
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await self.node.joined.wait()
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t = [
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stream.start_download(self.node)
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for stream in self.streams if stream.status == ManagedStream.STATUS_RUNNING
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]
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if t:
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log.info("resuming %i downloads", len(t))
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async def reflect_streams(self):
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while True:
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if self.config.reflector_servers:
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sd_hashes = await self.storage.get_streams_to_re_reflect()
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streams = list(filter(lambda s: s.sd_hash in sd_hashes, self.streams))
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batch = []
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while streams:
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stream = streams.pop()
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if not stream.fully_reflected.is_set():
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host, port = random.choice(self.config.reflector_servers)
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batch.append(stream.upload_to_reflector(host, port))
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if len(batch) >= self.config.concurrent_reflector_uploads:
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await asyncio.gather(*batch)
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batch = []
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if batch:
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await asyncio.gather(*batch)
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await asyncio.sleep(300, loop=self.loop)
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async def start(self):
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await self.load_streams_from_database()
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self.resume_downloading_task = self.loop.create_task(self.resume())
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self.re_reflect_task = self.loop.create_task(self.reflect_streams())
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def stop(self):
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if self.resume_downloading_task and not self.resume_downloading_task.done():
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self.resume_downloading_task.cancel()
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if self.re_reflect_task and not self.re_reflect_task.done():
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self.re_reflect_task.cancel()
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while self.streams:
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stream = self.streams.pop()
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stream.stop_download()
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while self.update_stream_finished_futs:
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self.update_stream_finished_futs.pop().cancel()
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async def create_stream(self, file_path: str, key: typing.Optional[bytes] = None,
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iv_generator: typing.Optional[typing.Generator[bytes, None, None]] = None) -> ManagedStream:
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stream = await ManagedStream.create(self.loop, self.blob_manager, file_path, key, iv_generator)
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self.streams.add(stream)
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self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream)
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if self.config.reflector_servers:
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host, port = random.choice(self.config.reflector_servers)
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self.loop.create_task(stream.upload_to_reflector(host, port))
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return stream
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async def delete_stream(self, stream: ManagedStream, delete_file: typing.Optional[bool] = False):
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await self.stop_stream(stream)
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if stream in self.streams:
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self.streams.remove(stream)
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blob_hashes = [stream.sd_hash] + [b.blob_hash for b in stream.descriptor.blobs[:-1]]
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await self.blob_manager.delete_blobs(blob_hashes, delete_from_db=False)
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await self.storage.delete_stream(stream.descriptor)
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if delete_file and os.path.isfile(stream.full_path):
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os.remove(stream.full_path)
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def wait_for_stream_finished(self, stream: ManagedStream):
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async def _wait_for_stream_finished():
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if stream.downloader and stream.running:
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try:
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await stream.downloader.stream_finished_event.wait()
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stream.update_status(ManagedStream.STATUS_FINISHED)
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except asyncio.CancelledError:
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pass
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task = self.loop.create_task(_wait_for_stream_finished())
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self.update_stream_finished_futs.append(task)
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task.add_done_callback(
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lambda _: None if task not in self.update_stream_finished_futs else
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self.update_stream_finished_futs.remove(task)
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)
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async def _download_stream_from_claim(self, node: 'Node', download_directory: str, claim_info: typing.Dict,
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file_name: typing.Optional[str] = None) -> typing.Optional[ManagedStream]:
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claim = smart_decode(claim_info['value'])
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downloader = StreamDownloader(self.loop, self.config, self.blob_manager, claim.source_hash.decode(),
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download_directory, file_name)
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try:
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downloader.download(node)
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await downloader.got_descriptor.wait()
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log.info("got descriptor %s for %s", claim.source_hash.decode(), claim_info['name'])
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except (asyncio.TimeoutError, asyncio.CancelledError):
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log.info("stream timeout")
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downloader.stop()
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log.info("stopped stream")
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return
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file_name = os.path.basename(downloader.output_path)
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download_directory = os.path.dirname(downloader.output_path)
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if not await self.blob_manager.storage.stream_exists(downloader.sd_hash):
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await self.blob_manager.storage.store_stream(downloader.sd_blob, downloader.descriptor)
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if not await self.blob_manager.storage.file_exists(downloader.sd_hash):
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await self.blob_manager.storage.save_downloaded_file(
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downloader.descriptor.stream_hash, file_name, download_directory,
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0.0
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)
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await self.blob_manager.storage.save_content_claim(
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downloader.descriptor.stream_hash, f"{claim_info['txid']}:{claim_info['nout']}"
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)
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stream = ManagedStream(self.loop, self.blob_manager, downloader.descriptor, download_directory,
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file_name, downloader, ManagedStream.STATUS_RUNNING)
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stream.set_claim(claim_info, claim)
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self.streams.add(stream)
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try:
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await stream.downloader.wrote_bytes_event.wait()
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self.wait_for_stream_finished(stream)
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return stream
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except asyncio.CancelledError:
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downloader.stop()
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log.debug("stopped stream")
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async def download_stream_from_claim(self, node: 'Node', claim_info: typing.Dict,
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file_name: typing.Optional[str] = None,
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timeout: typing.Optional[float] = 60,
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fee_amount: typing.Optional[float] = 0.0,
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fee_address: typing.Optional[str] = None,
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should_pay: typing.Optional[bool] = True) -> typing.Optional[ManagedStream]:
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claim = ClaimDict.load_dict(claim_info['value'])
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sd_hash = claim.source_hash.decode()
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if sd_hash in self.starting_streams:
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return await self.starting_streams[sd_hash]
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already_started = tuple(filter(lambda s: s.descriptor.sd_hash == sd_hash, self.streams))
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if already_started:
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return already_started[0]
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if should_pay and fee_address and fee_amount and fee_amount > await self.wallet.default_account.get_balance():
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raise Exception("not enough funds")
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self.starting_streams[sd_hash] = asyncio.Future(loop=self.loop)
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stream_task = self.loop.create_task(
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self._download_stream_from_claim(node, self.config.download_dir, claim_info, file_name)
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)
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try:
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await asyncio.wait_for(stream_task, timeout or self.config.download_timeout)
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stream = await stream_task
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self.starting_streams[sd_hash].set_result(stream)
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if should_pay and fee_address and fee_amount:
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await self.wallet.send_amount_to_address(lbc_to_dewies(str(fee_amount)), fee_address.encode('latin1'))
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return stream
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except (asyncio.TimeoutError, asyncio.CancelledError):
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return
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finally:
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if sd_hash in self.starting_streams:
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del self.starting_streams[sd_hash]
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def get_stream_by_stream_hash(self, stream_hash: str) -> typing.Optional[ManagedStream]:
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streams = tuple(filter(lambda stream: stream.stream_hash == stream_hash, self.streams))
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if streams:
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return streams[0]
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def get_filtered_streams(self, sort_by: typing.Optional[str] = None, reverse: typing.Optional[bool] = False,
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comparison: typing.Optional[str] = None,
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**search_by) -> typing.List[ManagedStream]:
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"""
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Get a list of filtered and sorted ManagedStream objects
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:param sort_by: field to sort by
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:param reverse: reverse sorting
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:param comparison: comparison operator used for filtering
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:param search_by: fields and values to filter by
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"""
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if sort_by and sort_by not in filter_fields:
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raise ValueError(f"'{sort_by}' is not a valid field to sort by")
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if comparison and comparison not in comparison_operators:
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raise ValueError(f"'{comparison}' is not a valid comparison")
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for search in search_by.keys():
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if search not in filter_fields:
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raise ValueError(f"'{search}' is not a valid search operation")
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if search_by:
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comparison = comparison or 'eq'
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streams = []
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for stream in self.streams:
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for search, val in search_by.items():
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if search == 'full_status':
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continue
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if comparison_operators[comparison](getattr(stream, search), val):
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streams.append(stream)
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break
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else:
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streams = list(self.streams)
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if sort_by:
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streams.sort(key=lambda s: getattr(s, sort_by))
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if reverse:
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streams.reverse()
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return streams
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async def download_stream_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager',
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file_name: typing.Optional[str] = None,
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timeout: typing.Optional[float] = None) -> typing.Optional[ManagedStream]:
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timeout = timeout or self.config.download_timeout
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parsed_uri = parse_lbry_uri(uri)
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if parsed_uri.is_channel:
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raise Exception("cannot download a channel claim, specify a /path")
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resolved = (await self.wallet.resolve(uri)).get(uri, {})
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resolved = resolved if 'value' in resolved else resolved.get('claim')
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if not resolved:
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raise ResolveError(
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"Failed to resolve stream at lbry://{}".format(uri.replace("lbry://", ""))
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)
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if 'error' in resolved:
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raise ResolveError(f"error resolving stream: {resolved['error']}")
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claim = ClaimDict.load_dict(resolved['value'])
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fee_amount, fee_address = None, None
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if claim.has_fee:
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fee_amount = round(exchange_rate_manager.convert_currency(
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claim.source_fee.currency, "LBC", claim.source_fee.amount
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), 5)
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fee_address = claim.source_fee.address.decode()
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outpoint = f"{resolved['txid']}:{resolved['nout']}"
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existing = self.get_filtered_streams(outpoint=outpoint)
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if not existing:
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existing.extend(self.get_filtered_streams(sd_hash=claim.source_hash.decode()))
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if existing and existing[0].claim_id != resolved['claim_id']:
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raise Exception(f"stream for {existing[0].claim_id} collides with existing "
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f"download {resolved['claim_id']}")
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elif not existing:
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existing.extend(self.get_filtered_streams(claim_id=resolved['claim_id']))
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if existing and existing[0].sd_hash != claim.source_hash.decode():
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log.info("claim contains an update to a stream we have, downloading it")
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stream = await self.download_stream_from_claim(
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self.node, resolved, file_name, timeout, fee_amount, fee_address, False
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)
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log.info("started new stream, deleting old one")
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await self.delete_stream(existing[0])
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return stream
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elif existing:
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log.info("already have matching stream for %s", uri)
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stream = existing[0]
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await self.start_stream(stream)
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return stream
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else:
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stream = existing[0]
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await self.start_stream(stream)
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return stream
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log.info("download stream from %s", uri)
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return await self.download_stream_from_claim(
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self.node, resolved, file_name, timeout, fee_amount, fee_address
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)
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