274 lines
13 KiB
Python
274 lines
13 KiB
Python
import os
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import asyncio
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import binascii
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import logging
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import random
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import typing
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from typing import Optional
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from aiohttp.web import Request
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from lbry.error import InvalidStreamDescriptorError
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from lbry.file.source_manager import SourceManager
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from lbry.stream.descriptor import StreamDescriptor
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from lbry.stream.managed_stream import ManagedStream
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from lbry.file.source import ManagedDownloadSource
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if typing.TYPE_CHECKING:
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from lbry.conf import Config
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from lbry.blob.blob_manager import BlobManager
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from lbry.dht.node import Node
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from lbry.wallet.wallet import WalletManager
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from lbry.wallet.transaction import Transaction
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from lbry.extras.daemon.analytics import AnalyticsManager
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from lbry.extras.daemon.storage import SQLiteStorage, StoredContentClaim
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log = logging.getLogger(__name__)
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def path_or_none(encoded_path) -> Optional[str]:
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if not encoded_path:
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return
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return binascii.unhexlify(encoded_path).decode()
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class StreamManager(SourceManager):
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_sources: typing.Dict[str, ManagedStream]
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filter_fields = SourceManager.filter_fields
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filter_fields.update({
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'sd_hash',
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'stream_hash',
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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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'uploading_to_reflector',
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'is_fully_reflected'
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})
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def __init__(self, loop: asyncio.AbstractEventLoop, config: 'Config', blob_manager: 'BlobManager',
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wallet_manager: 'WalletManager', storage: 'SQLiteStorage', node: Optional['Node'],
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analytics_manager: Optional['AnalyticsManager'] = None):
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super().__init__(loop, config, storage, analytics_manager)
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self.blob_manager = blob_manager
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self.wallet_manager = wallet_manager
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self.node = node
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self.resume_saving_task: Optional[asyncio.Task] = None
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self.re_reflect_task: Optional[asyncio.Task] = None
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self.update_stream_finished_futs: typing.List[asyncio.Future] = []
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self.running_reflector_uploads: typing.Dict[str, asyncio.Task] = {}
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self.started = asyncio.Event(loop=self.loop)
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@property
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def streams(self):
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return self._sources
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def add(self, source: ManagedStream):
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super().add(source)
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self.storage.content_claim_callbacks[source.stream_hash] = lambda: self._update_content_claim(source)
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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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self._sources.setdefault(stream.sd_hash, stream).set_claim(claim_info, claim_info['value'])
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async def recover_streams(self, file_infos: typing.List[typing.Dict]):
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to_restore = []
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async def recover_stream(sd_hash: str, stream_hash: str, stream_name: str,
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suggested_file_name: str, key: str,
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content_fee: Optional['Transaction']) -> Optional[StreamDescriptor]:
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sd_blob = self.blob_manager.get_blob(sd_hash)
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blobs = await self.storage.get_blobs_for_stream(stream_hash)
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descriptor = await StreamDescriptor.recover(
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self.blob_manager.blob_dir, sd_blob, stream_hash, stream_name, suggested_file_name, key, blobs
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)
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if not descriptor:
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return
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to_restore.append((descriptor, sd_blob, content_fee))
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await asyncio.gather(*[
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recover_stream(
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file_info['sd_hash'], file_info['stream_hash'], binascii.unhexlify(file_info['stream_name']).decode(),
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binascii.unhexlify(file_info['suggested_file_name']).decode(), file_info['key'],
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file_info['content_fee']
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) for file_info in file_infos
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])
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if to_restore:
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await self.storage.recover_streams(to_restore, self.config.download_dir)
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# if self.blob_manager._save_blobs:
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# log.info("Recovered %i/%i attempted streams", len(to_restore), len(file_infos))
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async def _load_stream(self, rowid: int, sd_hash: str, file_name: Optional[str],
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download_directory: Optional[str], status: str,
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claim: Optional['StoredContentClaim'], content_fee: Optional['Transaction'],
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added_on: Optional[int], fully_reflected: Optional[bool]):
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try:
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descriptor = await self.blob_manager.get_stream_descriptor(sd_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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stream = ManagedStream(
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self.loop, self.config, self.blob_manager, descriptor.sd_hash, download_directory, file_name, status,
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claim, content_fee=content_fee, rowid=rowid, descriptor=descriptor,
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analytics_manager=self.analytics_manager, added_on=added_on
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)
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if fully_reflected:
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stream.fully_reflected.set()
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self.add(stream)
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async def initialize_from_database(self):
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to_recover = []
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to_start = []
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await self.storage.update_manually_removed_files_since_last_run()
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for file_info in await self.storage.get_all_lbry_files():
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# if the sd blob is not verified, try to reconstruct it from the database
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# this could either be because the blob files were deleted manually or save_blobs was not true when
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# the stream was downloaded
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if not self.blob_manager.is_blob_verified(file_info['sd_hash']):
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to_recover.append(file_info)
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to_start.append(file_info)
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if to_recover:
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await self.recover_streams(to_recover)
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log.info("Initializing %i files", len(to_start))
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to_resume_saving = []
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add_stream_tasks = []
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for file_info in to_start:
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file_name = path_or_none(file_info['file_name'])
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download_directory = path_or_none(file_info['download_directory'])
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if file_name and download_directory and not file_info['saved_file'] and file_info['status'] == 'running':
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to_resume_saving.append((file_name, download_directory, file_info['sd_hash']))
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add_stream_tasks.append(self.loop.create_task(self._load_stream(
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file_info['rowid'], file_info['sd_hash'], file_name,
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download_directory, file_info['status'],
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file_info['claim'], file_info['content_fee'],
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file_info['added_on'], file_info['fully_reflected']
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)))
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if add_stream_tasks:
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await asyncio.gather(*add_stream_tasks, loop=self.loop)
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log.info("Started stream manager with %i files", len(self._sources))
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if not self.node:
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log.info("no DHT node given, resuming downloads trusting that we can contact reflector")
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if to_resume_saving:
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log.info("Resuming saving %i files", len(to_resume_saving))
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self.resume_saving_task = asyncio.ensure_future(asyncio.gather(
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*(self._sources[sd_hash].save_file(file_name, download_directory)
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for (file_name, download_directory, sd_hash) in to_resume_saving),
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loop=self.loop
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))
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async def reflect_streams(self):
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try:
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return await self._reflect_streams()
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except asyncio.CancelledError:
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raise
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except Exception:
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log.exception("reflector task encountered an unexpected error!")
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async def _reflect_streams(self):
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# todo: those debug statements are temporary for #2987 - remove them if its closed
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while True:
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if self.config.reflect_streams and self.config.reflector_servers:
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log.debug("collecting streams to reflect")
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sd_hashes = await self.storage.get_streams_to_re_reflect()
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sd_hashes = [sd for sd in sd_hashes if sd in self._sources]
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batch = []
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while sd_hashes:
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stream = self.streams[sd_hashes.pop()]
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if self.blob_manager.is_blob_verified(stream.sd_hash) and stream.blobs_completed and \
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stream.sd_hash not in self.running_reflector_uploads and not \
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stream.fully_reflected.is_set():
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batch.append(self.reflect_stream(stream))
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if len(batch) >= self.config.concurrent_reflector_uploads:
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log.debug("waiting for batch of %s reflecting streams", len(batch))
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await asyncio.gather(*batch, loop=self.loop)
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log.debug("done processing %s streams", len(batch))
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batch = []
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if batch:
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log.debug("waiting for batch of %s reflecting streams", len(batch))
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await asyncio.gather(*batch, loop=self.loop)
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log.debug("done processing %s streams", len(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 super().start()
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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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super().stop()
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if self.resume_saving_task and not self.resume_saving_task.done():
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self.resume_saving_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.update_stream_finished_futs:
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self.update_stream_finished_futs.pop().cancel()
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while self.running_reflector_uploads:
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_, t = self.running_reflector_uploads.popitem()
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t.cancel()
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self.started.clear()
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log.info("finished stopping the stream manager")
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def reflect_stream(self, stream: ManagedStream, server: Optional[str] = None,
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port: Optional[int] = None) -> asyncio.Task:
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if not server or not port:
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server, port = random.choice(self.config.reflector_servers)
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if stream.sd_hash in self.running_reflector_uploads:
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return self.running_reflector_uploads[stream.sd_hash]
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task = self.loop.create_task(self._retriable_reflect_stream(stream, server, port))
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self.running_reflector_uploads[stream.sd_hash] = task
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task.add_done_callback(
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lambda _: None if stream.sd_hash not in self.running_reflector_uploads else
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self.running_reflector_uploads.pop(stream.sd_hash)
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)
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return task
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async def _retriable_reflect_stream(self, stream, host, port):
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sent = await stream.upload_to_reflector(host, port)
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while not stream.is_fully_reflected and stream.reflector_progress > 0 and len(sent) > 0:
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stream.reflector_progress = 0
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sent = await stream.upload_to_reflector(host, port)
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return sent
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async def create(self, file_path: str, key: Optional[bytes] = None,
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iv_generator: Optional[typing.Generator[bytes, None, None]] = None) -> ManagedStream:
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descriptor = await StreamDescriptor.create_stream(
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self.loop, self.blob_manager.blob_dir, file_path, key=key, iv_generator=iv_generator,
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blob_completed_callback=self.blob_manager.blob_completed
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)
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await self.storage.store_stream(
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self.blob_manager.get_blob(descriptor.sd_hash, is_mine=True), descriptor
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)
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row_id = await self.storage.save_published_file(
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descriptor.stream_hash, os.path.basename(file_path), os.path.dirname(file_path), 0
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)
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stream = ManagedStream(
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self.loop, self.config, self.blob_manager, descriptor.sd_hash, os.path.dirname(file_path),
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os.path.basename(file_path), status=ManagedDownloadSource.STATUS_FINISHED,
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rowid=row_id, descriptor=descriptor
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)
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self.streams[stream.sd_hash] = 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.reflect_streams and self.config.reflector_servers:
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self.reflect_stream(stream)
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return stream
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async def delete(self, source: ManagedDownloadSource, delete_file: Optional[bool] = False):
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if not isinstance(source, ManagedStream):
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return
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if source.identifier in self.running_reflector_uploads:
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self.running_reflector_uploads[source.identifier].cancel()
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source.stop_tasks()
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if source.identifier in self.streams:
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del self.streams[source.identifier]
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blob_hashes = [source.identifier] + [b.blob_hash for b in source.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(source.descriptor)
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if delete_file and source.output_file_exists:
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os.remove(source.full_path)
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async def stream_partial_content(self, request: Request, sd_hash: str):
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stream = self._sources[sd_hash]
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if not stream.downloader.node:
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stream.downloader.node = self.node
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return await stream.stream_file(request)
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