forked from LBRYCommunity/lbry-sdk
258 lines
12 KiB
Python
258 lines
12 KiB
Python
import asyncio
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import logging
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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, DownloadSDTimeoutError, InsufficientFundsError
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from lbry.error import ResolveTimeoutError, DownloadDataTimeoutError, KeyFeeAboveMaxAllowedError
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from lbry.stream.managed_stream import ManagedStream
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from lbry.utils import cache_concurrent
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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.file.source_manager import SourceManager
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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.extras.daemon.analytics import AnalyticsManager
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from lbry.extras.daemon.storage import SQLiteStorage
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from lbry.wallet import WalletManager
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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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class FileManager:
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def __init__(self, loop: asyncio.AbstractEventLoop, config: 'Config', wallet_manager: 'WalletManager',
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storage: 'SQLiteStorage', analytics_manager: Optional['AnalyticsManager'] = None):
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self.loop = loop
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self.config = config
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self.wallet_manager = wallet_manager
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self.storage = storage
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self.analytics_manager = analytics_manager
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self.source_managers: typing.Dict[str, SourceManager] = {}
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self.started = asyncio.Event()
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@property
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def streams(self):
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return self.source_managers['stream']._sources
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async def create_stream(self, file_path: str, key: Optional[bytes] = None, **kwargs) -> ManagedDownloadSource:
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if 'stream' in self.source_managers:
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return await self.source_managers['stream'].create(file_path, key, **kwargs)
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raise NotImplementedError
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async def start(self):
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await asyncio.gather(*(source_manager.start() for source_manager in self.source_managers.values()))
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for manager in self.source_managers.values():
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await manager.started.wait()
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self.started.set()
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def stop(self):
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for manager in self.source_managers.values():
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# fixme: pop or not?
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manager.stop()
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self.started.clear()
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@cache_concurrent
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async def download_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager',
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timeout: Optional[float] = None, file_name: Optional[str] = None,
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download_directory: Optional[str] = None,
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save_file: Optional[bool] = None, resolve_timeout: float = 3.0,
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wallet: Optional['Wallet'] = None) -> ManagedDownloadSource:
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wallet = wallet or self.wallet_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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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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resolved_result = await asyncio.wait_for(
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self.wallet_manager.ledger.resolve(wallet.accounts, [uri]),
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resolve_timeout
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)
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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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if not resolved_result:
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raise ResolveError(f"Failed to resolve stream at '{uri}'")
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if 'error' in resolved_result:
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raise ResolveError(f"Unexpected error resolving uri for download: {resolved_result['error']}")
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txo = resolved_result[uri]
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claim = txo.claim
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outpoint = f"{txo.tx_ref.id}:{txo.position}"
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resolved_time = self.loop.time() - start_time
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await self.storage.save_claim_from_output(self.wallet_manager.ledger, txo)
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####################
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# update or replace
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####################
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if claim.stream.source.bt_infohash:
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source_manager = self.source_managers['torrent']
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else:
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source_manager = self.source_managers['stream']
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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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existing = self.get_filtered(sd_hash=claim.stream.source.sd_hash)
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to_replace, updated_stream = None, None
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if existing and existing[0].claim_id != txo.claim_id:
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raise ResolveError(f"stream for {existing[0].claim_id} collides with existing download {txo.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 source_manager._update_content_claim(existing[0])
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updated_stream = existing[0]
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else:
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existing_for_claim_id = self.get_filtered(claim_id=txo.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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if save_file and existing_for_claim_id[0].output_file_exists:
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save_file = False
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await existing_for_claim_id[0].start(timeout=timeout, save_now=save_file)
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if not existing_for_claim_id[0].output_file_exists and (
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save_file or file_name or download_directory):
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await existing_for_claim_id[0].save_file(
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file_name=file_name, download_directory=download_directory
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)
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to_replace = existing_for_claim_id[0]
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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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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(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
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)
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return updated_stream
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####################
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# pay fee
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####################
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if not to_replace and txo.has_price and not txo.purchase_receipt:
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payment = await self.wallet_manager.create_purchase_transaction(
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wallet.accounts, txo, exchange_rate_manager
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)
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####################
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# make downloader and wait for start
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####################
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if not claim.stream.source.bt_infohash:
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stream = ManagedStream(
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self.loop, self.config, source_manager.blob_manager, claim.stream.source.sd_hash,
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download_directory, 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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else:
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stream = None
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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(timeout, save_file)
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####################
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# success case: delete to_replace if applicable, broadcast fee payment
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####################
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if to_replace: # delete old stream now that the replacement has started downloading
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await source_manager.delete(to_replace)
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if payment is not None:
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await self.wallet_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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source_manager.add(stream)
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await self.storage.save_content_claim(stream.stream_hash, outpoint)
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if save_file:
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await asyncio.wait_for(stream.save_file(), timeout - (self.loop.time() - before_download),
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loop=self.loop)
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return stream
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except asyncio.TimeoutError:
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error = DownloadDataTimeoutError(stream.sd_hash)
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raise error
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except Exception as err: # forgive data timeout, don't delete stream
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expected = (DownloadSDTimeoutError, DownloadDataTimeoutError, InsufficientFundsError,
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KeyFeeAboveMaxAllowedError)
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if isinstance(err, expected):
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log.warning("Failed to download %s: %s", uri, str(err))
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elif isinstance(err, asyncio.CancelledError):
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pass
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else:
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log.exception("Unexpected error downloading stream:")
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error = err
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raise
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finally:
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if payment is not None:
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# payment is set to None after broadcasting, if we're here an exception probably happened
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await self.wallet_manager.ledger.release_tx(payment)
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if self.analytics_manager and (error or (stream and (stream.downloader.time_to_descriptor or
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stream.downloader.time_to_first_bytes))):
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server = self.wallet_manager.ledger.network.client.server
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self.loop.create_task(
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self.analytics_manager.send_time_to_first_bytes(
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resolved_time, self.loop.time() - start_time, None if not stream else stream.download_id,
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uri, outpoint,
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None if not stream else len(stream.downloader.blob_downloader.active_connections),
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None if not stream else len(stream.downloader.blob_downloader.scores),
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None if not stream else len(stream.downloader.blob_downloader.connection_failures),
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False if not stream else stream.downloader.added_fixed_peers,
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self.config.fixed_peer_delay if not stream else stream.downloader.fixed_peers_delay,
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None if not stream else stream.sd_hash,
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None if not stream else stream.downloader.time_to_descriptor,
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None if not (stream and stream.descriptor) else stream.descriptor.blobs[0].blob_hash,
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None if not (stream and stream.descriptor) else stream.descriptor.blobs[0].length,
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None if not stream else stream.downloader.time_to_first_bytes,
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None if not error else error.__class__.__name__,
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None if not error else str(error),
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None if not server else f"{server[0]}:{server[1]}"
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)
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)
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async def stream_partial_content(self, request: Request, sd_hash: str):
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return await self.source_managers['stream'].stream_partial_content(request, sd_hash)
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def get_filtered(self, *args, **kwargs) -> typing.List[ManagedDownloadSource]:
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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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return sum((manager.get_filtered(*args, **kwargs) for manager in self.source_managers.values()), [])
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async def delete(self, source: ManagedDownloadSource, delete_file=False):
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for manager in self.source_managers.values():
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return await manager.delete(source, delete_file)
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