forked from LBRYCommunity/lbry-sdk
479 lines
23 KiB
Python
479 lines
23 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 ResolveError, InvalidStreamDescriptorError, DownloadSDTimeoutError, InsufficientFundsError
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from lbry.error import ResolveTimeoutError, DownloadDataTimeoutError, KeyFeeAboveMaxAllowedError
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from lbry.utils import cache_concurrent
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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.schema.claim import Claim
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from lbry.schema.url import URL
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from lbry.wallet.dewies import dewies_to_lbc
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from lbry.wallet import Output
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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.extras.daemon.analytics import AnalyticsManager
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from lbry.extras.daemon.storage import SQLiteStorage, StoredContentClaim
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from lbry.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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'rowid',
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'status',
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'file_name',
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'added_on',
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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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def path_or_none(path) -> Optional[str]:
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if not path:
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return
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return binascii.unhexlify(path).decode()
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class StreamManager:
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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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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_manager = wallet_manager
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self.storage = storage
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self.node = node
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self.analytics_manager = analytics_manager
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self.streams: typing.Dict[str, ManagedStream] = {}
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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.List[asyncio.Task] = []
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self.started = asyncio.Event(loop=self.loop)
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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.streams.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 add_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]):
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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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self.streams[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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async def load_and_resume_streams_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.add_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']
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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.streams))
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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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self.resume_saving_task = self.loop.create_task(self.resume(to_resume_saving))
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async def resume(self, to_resume_saving):
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log.info("Resuming saving %i files", len(to_resume_saving))
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await asyncio.gather(
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*(self.streams[sd_hash].save_file(file_name, download_directory, node=self.node)
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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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while True:
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if self.config.reflect_streams and self.config.reflector_servers:
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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.streams]
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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:
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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, loop=self.loop)
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batch = []
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if batch:
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await asyncio.gather(*batch, loop=self.loop)
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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_and_resume_streams_from_database()
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self.re_reflect_task = self.loop.create_task(self.reflect_streams())
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self.started.set()
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def stop(self):
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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.streams:
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_, stream = self.streams.popitem()
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stream.stop_tasks()
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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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self.running_reflector_uploads.pop().cancel()
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self.started.clear()
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log.info("finished stopping the stream manager")
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async def create_stream(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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stream = await ManagedStream.create(self.loop, self.config, self.blob_manager, file_path, key, iv_generator)
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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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host, port = random.choice(self.config.reflector_servers)
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task = self.loop.create_task(stream.upload_to_reflector(host, port))
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self.running_reflector_uploads.append(task)
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task.add_done_callback(
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lambda _: None
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if task not in self.running_reflector_uploads else self.running_reflector_uploads.remove(task)
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)
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return stream
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async def delete_stream(self, stream: ManagedStream, delete_file: Optional[bool] = False):
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stream.stop_tasks()
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if stream.sd_hash in self.streams:
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del self.streams[stream.sd_hash]
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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 stream.output_file_exists:
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os.remove(stream.full_path)
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def get_stream_by_stream_hash(self, stream_hash: str) -> Optional[ManagedStream]:
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streams = tuple(filter(lambda stream: stream.stream_hash == stream_hash, self.streams.values()))
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if streams:
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return streams[0]
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def get_filtered_streams(self, sort_by: Optional[str] = None, reverse: Optional[bool] = False,
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comparison: 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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if 'full_status' in search_by:
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del search_by['full_status']
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for search in search_by:
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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.values():
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for search, val in search_by.items():
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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.values())
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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 _check_update_or_replace(self, outpoint: str, claim_id: str, claim: Claim
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) -> typing.Tuple[Optional[ManagedStream], Optional[ManagedStream]]:
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existing = self.get_filtered_streams(outpoint=outpoint)
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if existing:
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return existing[0], None
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existing = self.get_filtered_streams(sd_hash=claim.stream.source.sd_hash)
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if existing and existing[0].claim_id != claim_id:
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raise ResolveError(f"stream for {existing[0].claim_id} collides with existing download {claim_id}")
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if existing:
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log.info("claim contains a metadata only update to a stream we have")
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await self.storage.save_content_claim(
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existing[0].stream_hash, outpoint
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)
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await self._update_content_claim(existing[0])
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return existing[0], None
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else:
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existing_for_claim_id = self.get_filtered_streams(claim_id=claim_id)
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if existing_for_claim_id:
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log.info("claim contains an update to a stream we have, downloading it")
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return None, existing_for_claim_id[0]
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return None, None
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@staticmethod
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def _convert_to_old_resolve_output(wallet_manager, resolves):
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result = {}
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for url, txo in resolves.items():
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if isinstance(txo, Output):
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tx_height = txo.tx_ref.height
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best_height = wallet_manager.ledger.headers.height
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result[url] = {
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'name': txo.claim_name,
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'value': txo.claim,
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'protobuf': binascii.hexlify(txo.claim.to_bytes()),
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'claim_id': txo.claim_id,
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'txid': txo.tx_ref.id,
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'nout': txo.position,
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'amount': dewies_to_lbc(txo.amount),
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'effective_amount': txo.meta.get('effective_amount', 0),
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'height': tx_height,
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'confirmations': (best_height+1) - tx_height if tx_height > 0 else tx_height,
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'claim_sequence': -1,
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'address': txo.get_address(wallet_manager.ledger),
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'valid_at_height': txo.meta.get('activation_height', None),
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'timestamp': wallet_manager.ledger.headers[tx_height]['timestamp'],
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'supports': []
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}
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else:
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result[url] = txo
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return result
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@cache_concurrent
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async def download_stream_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager',
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timeout: Optional[float] = None,
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file_name: Optional[str] = None,
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download_directory: Optional[str] = None,
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save_file: Optional[bool] = None,
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resolve_timeout: float = 3.0,
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wallet: Optional['Wallet'] = None) -> ManagedStream:
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manager = self.wallet_manager
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wallet = wallet or manager.default_wallet
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timeout = timeout or self.config.download_timeout
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start_time = self.loop.time()
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resolved_time = None
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stream = None
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txo: Optional[Output] = None
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error = None
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outpoint = None
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if save_file is None:
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save_file = self.config.save_files
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if file_name and not save_file:
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save_file = True
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if save_file:
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download_directory = download_directory or self.config.download_dir
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else:
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download_directory = None
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payment = None
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try:
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# resolve the claim
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if not URL.parse(uri).has_stream:
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raise ResolveError("cannot download a channel claim, specify a /path")
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try:
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response = await asyncio.wait_for(
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manager.ledger.resolve(wallet.accounts, [uri]),
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resolve_timeout
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)
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resolved_result = self._convert_to_old_resolve_output(manager, response)
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except asyncio.TimeoutError:
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raise ResolveTimeoutError(uri)
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except Exception as err:
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if isinstance(err, asyncio.CancelledError):
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raise
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log.exception("Unexpected error resolving stream:")
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raise ResolveError(f"Unexpected error resolving stream: {str(err)}")
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await self.storage.save_claims_for_resolve([
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value for value in resolved_result.values() if 'error' not in value
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])
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resolved = resolved_result.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(f"Failed to resolve stream at '{uri}'")
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if 'error' in resolved:
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raise ResolveError(f"error resolving stream: {resolved['error']}")
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txo = response[uri]
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claim = Claim.from_bytes(binascii.unhexlify(resolved['protobuf']))
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outpoint = f"{resolved['txid']}:{resolved['nout']}"
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resolved_time = self.loop.time() - start_time
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# resume or update an existing stream, if the stream changed: download it and delete the old one after
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updated_stream, to_replace = await self._check_update_or_replace(outpoint, resolved['claim_id'], claim)
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if updated_stream:
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log.info("already have stream for %s", uri)
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if save_file and updated_stream.output_file_exists:
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save_file = False
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await updated_stream.start(node=self.node, timeout=timeout, save_now=save_file)
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if not updated_stream.output_file_exists and (save_file or file_name or download_directory):
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await updated_stream.save_file(
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file_name=file_name, download_directory=download_directory, node=self.node
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)
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return updated_stream
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if not to_replace and txo.has_price and not txo.purchase_receipt:
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payment = await manager.create_purchase_transaction(
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wallet.accounts, txo, exchange_rate_manager
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)
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stream = ManagedStream(
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self.loop, self.config, self.blob_manager, claim.stream.source.sd_hash, download_directory,
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file_name, ManagedStream.STATUS_RUNNING, content_fee=payment,
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analytics_manager=self.analytics_manager
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)
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log.info("starting download for %s", uri)
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before_download = self.loop.time()
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await stream.start(self.node, timeout)
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stream.set_claim(resolved, claim)
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if to_replace: # delete old stream now that the replacement has started downloading
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await self.delete_stream(to_replace)
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if payment is not None:
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await manager.broadcast_or_release(payment)
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payment = None # to avoid releasing in `finally` later
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log.info("paid fee of %s for %s", dewies_to_lbc(stream.content_fee.outputs[0].amount), uri)
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await self.storage.save_content_fee(stream.stream_hash, stream.content_fee)
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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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await self.storage.save_content_claim(stream.stream_hash, outpoint)
|
|
if save_file:
|
|
await asyncio.wait_for(stream.save_file(node=self.node), timeout - (self.loop.time() - before_download),
|
|
loop=self.loop)
|
|
return stream
|
|
except asyncio.TimeoutError:
|
|
error = DownloadDataTimeoutError(stream.sd_hash)
|
|
raise error
|
|
except Exception as err: # forgive data timeout, don't delete stream
|
|
expected = (DownloadSDTimeoutError, DownloadDataTimeoutError, InsufficientFundsError,
|
|
KeyFeeAboveMaxAllowedError)
|
|
if isinstance(err, expected):
|
|
log.warning("Failed to download %s: %s", uri, str(err))
|
|
elif isinstance(err, asyncio.CancelledError):
|
|
pass
|
|
else:
|
|
log.exception("Unexpected error downloading stream:")
|
|
error = err
|
|
raise
|
|
finally:
|
|
if payment is not None:
|
|
# payment is set to None after broadcasting, if we're here an exception probably happened
|
|
await manager.ledger.release_tx(payment)
|
|
if self.analytics_manager and (error or (stream and (stream.downloader.time_to_descriptor or
|
|
stream.downloader.time_to_first_bytes))):
|
|
server = self.wallet_manager.ledger.network.client.server
|
|
self.loop.create_task(
|
|
self.analytics_manager.send_time_to_first_bytes(
|
|
resolved_time, self.loop.time() - start_time, None if not stream else stream.download_id,
|
|
uri, outpoint,
|
|
None if not stream else len(stream.downloader.blob_downloader.active_connections),
|
|
None if not stream else len(stream.downloader.blob_downloader.scores),
|
|
None if not stream else len(stream.downloader.blob_downloader.connection_failures),
|
|
False if not stream else stream.downloader.added_fixed_peers,
|
|
self.config.fixed_peer_delay if not stream else stream.downloader.fixed_peers_delay,
|
|
None if not stream else stream.sd_hash,
|
|
None if not stream else stream.downloader.time_to_descriptor,
|
|
None if not (stream and stream.descriptor) else stream.descriptor.blobs[0].blob_hash,
|
|
None if not (stream and stream.descriptor) else stream.descriptor.blobs[0].length,
|
|
None if not stream else stream.downloader.time_to_first_bytes,
|
|
None if not error else error.__class__.__name__,
|
|
None if not error else str(error),
|
|
None if not server else f"{server[0]}:{server[1]}"
|
|
)
|
|
)
|
|
|
|
async def stream_partial_content(self, request: Request, sd_hash: str):
|
|
return await self.streams[sd_hash].stream_file(request, self.node)
|