import os import asyncio import binascii import logging import random import typing from typing import Optional from aiohttp.web import Request from lbry.error import ResolveError, InvalidStreamDescriptorError, DownloadSDTimeoutError, InsufficientFundsError from lbry.error import ResolveTimeoutError, DownloadDataTimeoutError, KeyFeeAboveMaxAllowedError from lbry.utils import cache_concurrent from lbry.stream.descriptor import StreamDescriptor from lbry.stream.managed_stream import ManagedStream from lbry.schema.claim import Claim from lbry.schema.url import URL from lbry.wallet.dewies import dewies_to_lbc from lbry.wallet import Output if typing.TYPE_CHECKING: from lbry.conf import Config from lbry.blob.blob_manager import BlobManager from lbry.dht.node import Node from lbry.extras.daemon.analytics import AnalyticsManager from lbry.extras.daemon.storage import SQLiteStorage, StoredContentClaim from lbry.extras.daemon.exchange_rate_manager import ExchangeRateManager log = logging.getLogger(__name__) FILTER_FIELDS = [ 'rowid', 'status', 'file_name', 'added_on', 'sd_hash', 'stream_hash', 'claim_name', 'claim_height', 'claim_id', 'outpoint', 'txid', 'nout', 'channel_claim_id', 'channel_name', 'full_status', # TODO: remove 'blobs_remaining', 'blobs_in_stream' ] COMPARISON_OPERATORS = { 'eq': lambda a, b: a == b, 'ne': lambda a, b: a != b, 'g': lambda a, b: a > b, 'l': lambda a, b: a < b, 'ge': lambda a, b: a >= b, 'le': lambda a, b: a <= b, } def path_or_none(path) -> Optional[str]: if not path: return return binascii.unhexlify(path).decode() class StreamManager: def __init__(self, loop: asyncio.AbstractEventLoop, config: 'Config', blob_manager: 'BlobManager', wallet_manager: 'WalletManager', storage: 'SQLiteStorage', node: Optional['Node'], analytics_manager: Optional['AnalyticsManager'] = None): self.loop = loop self.config = config self.blob_manager = blob_manager self.wallet_manager = wallet_manager self.storage = storage self.node = node self.analytics_manager = analytics_manager self.streams: typing.Dict[str, ManagedStream] = {} self.resume_saving_task: Optional[asyncio.Task] = None self.re_reflect_task: Optional[asyncio.Task] = None self.update_stream_finished_futs: typing.List[asyncio.Future] = [] self.running_reflector_uploads: typing.Dict[str, asyncio.Task] = {} self.started = asyncio.Event(loop=self.loop) async def _update_content_claim(self, stream: ManagedStream): claim_info = await self.storage.get_content_claim(stream.stream_hash) self.streams.setdefault(stream.sd_hash, stream).set_claim(claim_info, claim_info['value']) async def recover_streams(self, file_infos: typing.List[typing.Dict]): to_restore = [] async def recover_stream(sd_hash: str, stream_hash: str, stream_name: str, suggested_file_name: str, key: str, content_fee: Optional['Transaction']) -> Optional[StreamDescriptor]: sd_blob = self.blob_manager.get_blob(sd_hash) blobs = await self.storage.get_blobs_for_stream(stream_hash) descriptor = await StreamDescriptor.recover( self.blob_manager.blob_dir, sd_blob, stream_hash, stream_name, suggested_file_name, key, blobs ) if not descriptor: return to_restore.append((descriptor, sd_blob, content_fee)) await asyncio.gather(*[ recover_stream( file_info['sd_hash'], file_info['stream_hash'], binascii.unhexlify(file_info['stream_name']).decode(), binascii.unhexlify(file_info['suggested_file_name']).decode(), file_info['key'], file_info['content_fee'] ) for file_info in file_infos ]) if to_restore: await self.storage.recover_streams(to_restore, self.config.download_dir) # if self.blob_manager._save_blobs: # log.info("Recovered %i/%i attempted streams", len(to_restore), len(file_infos)) async def add_stream(self, rowid: int, sd_hash: str, file_name: Optional[str], download_directory: Optional[str], status: str, claim: Optional['StoredContentClaim'], content_fee: Optional['Transaction'], added_on: Optional[int]): try: descriptor = await self.blob_manager.get_stream_descriptor(sd_hash) except InvalidStreamDescriptorError as err: log.warning("Failed to start stream for sd %s - %s", sd_hash, str(err)) return stream = ManagedStream( self.loop, self.config, self.blob_manager, descriptor.sd_hash, download_directory, file_name, status, claim, content_fee=content_fee, rowid=rowid, descriptor=descriptor, analytics_manager=self.analytics_manager, added_on=added_on ) self.streams[sd_hash] = stream self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) async def load_and_resume_streams_from_database(self): to_recover = [] to_start = [] await self.storage.update_manually_removed_files_since_last_run() for file_info in await self.storage.get_all_lbry_files(): # if the sd blob is not verified, try to reconstruct it from the database # this could either be because the blob files were deleted manually or save_blobs was not true when # the stream was downloaded if not self.blob_manager.is_blob_verified(file_info['sd_hash']): to_recover.append(file_info) to_start.append(file_info) if to_recover: log.info("Recover %i files", len(to_recover)) await self.recover_streams(to_recover) log.info("Initializing %i files", len(to_start)) to_resume_saving = [] add_stream_tasks = [] for file_info in to_start: file_name = path_or_none(file_info['file_name']) download_directory = path_or_none(file_info['download_directory']) if file_name and download_directory and not file_info['saved_file'] and file_info['status'] == 'running': to_resume_saving.append((file_name, download_directory, file_info['sd_hash'])) add_stream_tasks.append(self.loop.create_task(self.add_stream( file_info['rowid'], file_info['sd_hash'], file_name, download_directory, file_info['status'], file_info['claim'], file_info['content_fee'], file_info['added_on'] ))) if add_stream_tasks: await asyncio.gather(*add_stream_tasks, loop=self.loop) log.info("Started stream manager with %i files", len(self.streams)) if not self.node: log.info("no DHT node given, resuming downloads trusting that we can contact reflector") if to_resume_saving: self.resume_saving_task = self.loop.create_task(self.resume(to_resume_saving)) async def resume(self, to_resume_saving): log.info("Resuming saving %i files", len(to_resume_saving)) await asyncio.gather( *(self.streams[sd_hash].save_file(file_name, download_directory, node=self.node) for (file_name, download_directory, sd_hash) in to_resume_saving), loop=self.loop ) async def reflect_streams(self): while True: if self.config.reflect_streams and self.config.reflector_servers: sd_hashes = await self.storage.get_streams_to_re_reflect() sd_hashes = [sd for sd in sd_hashes if sd in self.streams] batch = [] while sd_hashes: stream = self.streams[sd_hashes.pop()] if self.blob_manager.is_blob_verified(stream.sd_hash) and stream.blobs_completed and \ stream.sd_hash not in self.running_reflector_uploads and not \ stream.fully_reflected.is_set(): batch.append(self.reflect_stream(stream)) if len(batch) >= self.config.concurrent_reflector_uploads: await asyncio.gather(*batch, loop=self.loop) batch = [] if batch: await asyncio.gather(*batch, loop=self.loop) await asyncio.sleep(300, loop=self.loop) async def start(self): await self.load_and_resume_streams_from_database() self.re_reflect_task = self.loop.create_task(self.reflect_streams()) self.started.set() def stop(self): if self.resume_saving_task and not self.resume_saving_task.done(): self.resume_saving_task.cancel() if self.re_reflect_task and not self.re_reflect_task.done(): self.re_reflect_task.cancel() while self.streams: _, stream = self.streams.popitem() stream.stop_tasks() while self.update_stream_finished_futs: self.update_stream_finished_futs.pop().cancel() while self.running_reflector_uploads: _, t = self.running_reflector_uploads.popitem() t.cancel() self.started.clear() log.info("finished stopping the stream manager") def reflect_stream(self, stream: ManagedStream, server: Optional[str] = None, port: Optional[int] = None) -> asyncio.Task: if not server or not port: server, port = random.choice(self.config.reflector_servers) if stream.sd_hash in self.running_reflector_uploads: return self.running_reflector_uploads[stream.sd_hash] task = self.loop.create_task(stream.upload_to_reflector(server, port)) self.running_reflector_uploads[stream.sd_hash] = task task.add_done_callback( lambda _: None if stream.sd_hash not in self.running_reflector_uploads else self.running_reflector_uploads.pop(stream.sd_hash) ) return task async def create_stream(self, file_path: str, key: Optional[bytes] = None, iv_generator: Optional[typing.Generator[bytes, None, None]] = None) -> ManagedStream: stream = await ManagedStream.create(self.loop, self.config, self.blob_manager, file_path, key, iv_generator) self.streams[stream.sd_hash] = stream self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) if self.config.reflect_streams and self.config.reflector_servers: self.reflect_stream(stream) return stream async def delete_stream(self, stream: ManagedStream, delete_file: Optional[bool] = False): if stream.sd_hash in self.running_reflector_uploads: self.running_reflector_uploads[stream.sd_hash].cancel() stream.stop_tasks() if stream.sd_hash in self.streams: del self.streams[stream.sd_hash] blob_hashes = [stream.sd_hash] + [b.blob_hash for b in stream.descriptor.blobs[:-1]] await self.blob_manager.delete_blobs(blob_hashes, delete_from_db=False) await self.storage.delete_stream(stream.descriptor) if delete_file and stream.output_file_exists: os.remove(stream.full_path) def get_stream_by_stream_hash(self, stream_hash: str) -> Optional[ManagedStream]: streams = tuple(filter(lambda stream: stream.stream_hash == stream_hash, self.streams.values())) if streams: return streams[0] def get_filtered_streams(self, sort_by: Optional[str] = None, reverse: Optional[bool] = False, comparison: Optional[str] = None, **search_by) -> typing.List[ManagedStream]: """ Get a list of filtered and sorted ManagedStream objects :param sort_by: field to sort by :param reverse: reverse sorting :param comparison: comparison operator used for filtering :param search_by: fields and values to filter by """ if sort_by and sort_by not in FILTER_FIELDS: raise ValueError(f"'{sort_by}' is not a valid field to sort by") if comparison and comparison not in COMPARISON_OPERATORS: raise ValueError(f"'{comparison}' is not a valid comparison") if 'full_status' in search_by: del search_by['full_status'] for search in search_by: if search not in FILTER_FIELDS: raise ValueError(f"'{search}' is not a valid search operation") if search_by: comparison = comparison or 'eq' streams = [] for stream in self.streams.values(): for search, val in search_by.items(): if COMPARISON_OPERATORS[comparison](getattr(stream, search), val): streams.append(stream) break else: streams = list(self.streams.values()) if sort_by: streams.sort(key=lambda s: getattr(s, sort_by)) if reverse: streams.reverse() return streams async def _check_update_or_replace(self, outpoint: str, claim_id: str, claim: Claim ) -> typing.Tuple[Optional[ManagedStream], Optional[ManagedStream]]: existing = self.get_filtered_streams(outpoint=outpoint) if existing: return existing[0], None existing = self.get_filtered_streams(sd_hash=claim.stream.source.sd_hash) if existing and existing[0].claim_id != claim_id: raise ResolveError(f"stream for {existing[0].claim_id} collides with existing download {claim_id}") if existing: log.info("claim contains a metadata only update to a stream we have") await self.storage.save_content_claim( existing[0].stream_hash, outpoint ) await self._update_content_claim(existing[0]) return existing[0], None else: existing_for_claim_id = self.get_filtered_streams(claim_id=claim_id) if existing_for_claim_id: log.info("claim contains an update to a stream we have, downloading it") return None, existing_for_claim_id[0] return None, None @staticmethod def _convert_to_old_resolve_output(wallet_manager, resolves): result = {} for url, txo in resolves.items(): if isinstance(txo, Output): tx_height = txo.tx_ref.height best_height = wallet_manager.ledger.headers.height result[url] = { 'name': txo.claim_name, 'value': txo.claim, 'protobuf': binascii.hexlify(txo.claim.to_bytes()), 'claim_id': txo.claim_id, 'txid': txo.tx_ref.id, 'nout': txo.position, 'amount': dewies_to_lbc(txo.amount), 'effective_amount': txo.meta.get('effective_amount', 0), 'height': tx_height, 'confirmations': (best_height+1) - tx_height if tx_height > 0 else tx_height, 'claim_sequence': -1, 'address': txo.get_address(wallet_manager.ledger), 'valid_at_height': txo.meta.get('activation_height', None), 'timestamp': wallet_manager.ledger.headers[tx_height]['timestamp'], 'supports': [] } else: result[url] = txo return result @cache_concurrent async def download_stream_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager', timeout: Optional[float] = None, file_name: Optional[str] = None, download_directory: Optional[str] = None, save_file: Optional[bool] = None, resolve_timeout: float = 3.0, wallet: Optional['Wallet'] = None) -> ManagedStream: manager = self.wallet_manager wallet = wallet or manager.default_wallet timeout = timeout or self.config.download_timeout start_time = self.loop.time() resolved_time = None stream = None txo: Optional[Output] = None error = None outpoint = None if save_file is None: save_file = self.config.save_files if file_name and not save_file: save_file = True if save_file: download_directory = download_directory or self.config.download_dir else: download_directory = None payment = None try: # resolve the claim if not URL.parse(uri).has_stream: raise ResolveError("cannot download a channel claim, specify a /path") try: response = await asyncio.wait_for( manager.ledger.resolve(wallet.accounts, [uri]), resolve_timeout ) resolved_result = self._convert_to_old_resolve_output(manager, response) except asyncio.TimeoutError: raise ResolveTimeoutError(uri) except Exception as err: if isinstance(err, asyncio.CancelledError): # TODO: remove when updated to 3.8 raise log.exception("Unexpected error resolving stream:") raise ResolveError(f"Unexpected error resolving stream: {str(err)}") await self.storage.save_claims_for_resolve([ value for value in resolved_result.values() if 'error' not in value ]) resolved = resolved_result.get(uri, {}) resolved = resolved if 'value' in resolved else resolved.get('claim') if not resolved: raise ResolveError(f"Failed to resolve stream at '{uri}'") if 'error' in resolved: raise ResolveError(f"error resolving stream: {resolved['error']}") txo = response[uri] claim = Claim.from_bytes(binascii.unhexlify(resolved['protobuf'])) outpoint = f"{resolved['txid']}:{resolved['nout']}" resolved_time = self.loop.time() - start_time # resume or update an existing stream, if the stream changed: download it and delete the old one after updated_stream, to_replace = await self._check_update_or_replace(outpoint, resolved['claim_id'], claim) if updated_stream: log.info("already have stream for %s", uri) if save_file and updated_stream.output_file_exists: save_file = False await updated_stream.start(node=self.node, timeout=timeout, save_now=save_file) if not updated_stream.output_file_exists and (save_file or file_name or download_directory): await updated_stream.save_file( file_name=file_name, download_directory=download_directory, node=self.node ) return updated_stream if not to_replace and txo.has_price and not txo.purchase_receipt: payment = await manager.create_purchase_transaction( wallet.accounts, txo, exchange_rate_manager ) stream = ManagedStream( self.loop, self.config, self.blob_manager, claim.stream.source.sd_hash, download_directory, file_name, ManagedStream.STATUS_RUNNING, content_fee=payment, analytics_manager=self.analytics_manager ) log.info("starting download for %s", uri) before_download = self.loop.time() await stream.start(self.node, timeout) stream.set_claim(resolved, claim) if to_replace: # delete old stream now that the replacement has started downloading await self.delete_stream(to_replace) if payment is not None: await manager.broadcast_or_release(payment) payment = None # to avoid releasing in `finally` later log.info("paid fee of %s for %s", dewies_to_lbc(stream.content_fee.outputs[0].amount), uri) await self.storage.save_content_fee(stream.stream_hash, stream.content_fee) self.streams[stream.sd_hash] = stream self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) 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)