import os import asyncio import typing import binascii import logging import random from decimal import Decimal from lbrynet.error import ResolveError, InvalidStreamDescriptorError, KeyFeeAboveMaxAllowed, InsufficientFundsError from lbrynet.error import DownloadSDTimeout, DownloadDataTimeout, ResolveTimeout from lbrynet.utils import cache_concurrent from lbrynet.stream.descriptor import StreamDescriptor from lbrynet.stream.managed_stream import ManagedStream from lbrynet.schema.claim import Claim from lbrynet.schema.uri import parse_lbry_uri from lbrynet.extras.daemon.storage import lbc_to_dewies if typing.TYPE_CHECKING: from lbrynet.conf import Config from lbrynet.blob.blob_manager import BlobManager from lbrynet.dht.node import Node from lbrynet.extras.daemon.analytics import AnalyticsManager from lbrynet.extras.daemon.storage import SQLiteStorage, StoredStreamClaim from lbrynet.wallet import LbryWalletManager from lbrynet.extras.daemon.exchange_rate_manager import ExchangeRateManager log = logging.getLogger(__name__) filter_fields = [ 'rowid', 'status', 'file_name', '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(p) -> typing.Optional[str]: return None if p == '{stream}' else binascii.unhexlify(p).decode() class StreamManager: def __init__(self, loop: asyncio.BaseEventLoop, config: 'Config', blob_manager: 'BlobManager', wallet: 'LbryWalletManager', storage: 'SQLiteStorage', node: typing.Optional['Node'], analytics_manager: typing.Optional['AnalyticsManager'] = None): self.loop = loop self.config = config self.blob_manager = blob_manager self.wallet = wallet self.storage = storage self.node = node self.analytics_manager = analytics_manager self.streams: typing.Dict[str, ManagedStream] = {} self.resume_downloading_task: asyncio.Task = None self.re_reflect_task: asyncio.Task = None self.update_stream_finished_futs: typing.List[asyncio.Future] = [] self.running_reflector_uploads: typing.List[asyncio.Task] = [] 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 stop_stream(self, stream: ManagedStream): stream.stop_download() if not stream.finished and stream.output_file_exists: try: os.remove(stream.full_path) except OSError as err: log.warning("Failed to delete partial download %s from downloads directory: %s", stream.full_path, str(err)) if stream.running: stream.update_status(ManagedStream.STATUS_STOPPED) await self.storage.change_file_status(stream.stream_hash, ManagedStream.STATUS_STOPPED) async def start_stream(self, stream: ManagedStream): stream.update_status(ManagedStream.STATUS_RUNNING) await self.storage.change_file_status(stream.stream_hash, ManagedStream.STATUS_RUNNING) await stream.setup(self.node, save_file=self.config.save_files) self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) 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) -> typing.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)) 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'] ) 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: typing.Optional[str], download_directory: typing.Optional[str], status: str, claim: typing.Optional['StoredStreamClaim']): 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, rowid=rowid, descriptor=descriptor, analytics_manager=self.analytics_manager ) self.streams[sd_hash] = stream async def load_streams_from_database(self): to_recover = [] to_start = [] await self.storage.sync_files_to_blobs() for file_info in await self.storage.get_all_lbry_files(): 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: # if self.blob_manager._save_blobs: # log.info("Attempting to recover %i streams", len(to_recover)) await self.recover_streams(to_recover) if not self.config.save_files: to_set_as_streaming = [] for file_info in to_start: file_name = path_or_none(file_info['file_name']) download_dir = path_or_none(file_info['download_directory']) if file_name and download_dir and not os.path.isfile(os.path.join(file_name, download_dir)): file_info['file_name'], file_info['download_directory'] = '{stream}', '{stream}' to_set_as_streaming.append(file_info['stream_hash']) if to_set_as_streaming: await self.storage.set_files_as_streaming(to_set_as_streaming) log.info("Initializing %i files", len(to_start)) if to_start: await asyncio.gather(*[ self.add_stream( file_info['rowid'], file_info['sd_hash'], path_or_none(file_info['file_name']), path_or_none(file_info['download_directory']), file_info['status'], file_info['claim'] ) for file_info in to_start ]) log.info("Started stream manager with %i files", len(self.streams)) async def resume(self): if not self.node: log.warning("no DHT node given, resuming downloads trusting that we can contact reflector") t = [ self.loop.create_task(self.start_stream(stream)) for stream in self.streams.values() if stream.running ] if t: log.info("resuming %i downloads", len(t)) await asyncio.gather(*t, 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: if not stream.fully_reflected.is_set(): host, port = random.choice(self.config.reflector_servers) batch.append(stream.upload_to_reflector(host, port)) 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_streams_from_database() self.resume_downloading_task = self.loop.create_task(self.resume()) self.re_reflect_task = self.loop.create_task(self.reflect_streams()) def stop(self): if self.resume_downloading_task and not self.resume_downloading_task.done(): self.resume_downloading_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_download() while self.update_stream_finished_futs: self.update_stream_finished_futs.pop().cancel() while self.running_reflector_uploads: self.running_reflector_uploads.pop().cancel() async def create_stream(self, file_path: str, key: typing.Optional[bytes] = None, iv_generator: typing.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: host, port = random.choice(self.config.reflector_servers) task = self.loop.create_task(stream.upload_to_reflector(host, port)) self.running_reflector_uploads.append(task) task.add_done_callback( lambda _: None if task not in self.running_reflector_uploads else self.running_reflector_uploads.remove(task) ) return stream async def delete_stream(self, stream: ManagedStream, delete_file: typing.Optional[bool] = False): await self.stop_stream(stream) 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) -> typing.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: typing.Optional[str] = None, reverse: typing.Optional[bool] = False, comparison: typing.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.keys(): 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[ typing.Optional[ManagedStream], typing.Optional[ManagedStream]]: existing = self.get_filtered_streams(outpoint=outpoint) if existing: if existing[0].status == ManagedStream.STATUS_STOPPED: await self.start_stream(existing[0]) 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 " f"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]) if not existing[0].running: await self.start_stream(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 @cache_concurrent async def download_stream_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager', timeout: typing.Optional[float] = None, file_name: typing.Optional[str] = None, download_directory: typing.Optional[str] = None, save_file: bool = True, resolve_timeout: float = 3.0) -> ManagedStream: timeout = timeout or self.config.download_timeout start_time = self.loop.time() resolved_time = None stream = None error = None outpoint = None try: # resolve the claim parsed_uri = parse_lbry_uri(uri) if parsed_uri.is_channel: raise ResolveError("cannot download a channel claim, specify a /path") try: resolved_result = await asyncio.wait_for(self.wallet.ledger.resolve(0, 1, uri), resolve_timeout) except asyncio.TimeoutError: raise ResolveTimeout(uri) 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']}") 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) return updated_stream content_fee = None # check that the fee is payable if not to_replace and claim.stream.has_fee: fee_amount = round(exchange_rate_manager.convert_currency( claim.stream.fee.currency, "LBC", claim.stream.fee.amount ), 5) max_fee_amount = round(exchange_rate_manager.convert_currency( self.config.max_key_fee['currency'], "LBC", Decimal(self.config.max_key_fee['amount']) ), 5) if fee_amount > max_fee_amount: msg = f"fee of {fee_amount} exceeds max configured to allow of {max_fee_amount}" log.warning(msg) raise KeyFeeAboveMaxAllowed(msg) balance = await self.wallet.default_account.get_balance() if lbc_to_dewies(str(fee_amount)) > balance: msg = f"fee of {fee_amount} exceeds max available balance" log.warning(msg) raise InsufficientFundsError(msg) fee_address = claim.stream.fee.address content_fee = await self.wallet.send_amount_to_address( lbc_to_dewies(str(fee_amount)), fee_address.encode('latin1') ) log.info("paid fee of %s for %s", fee_amount, uri) download_directory = download_directory or self.config.download_dir if not file_name and (not self.config.save_files or not save_file): download_dir, file_name = None, None stream = ManagedStream( self.loop, self.config, self.blob_manager, claim.stream.source.sd_hash, download_directory, file_name, ManagedStream.STATUS_RUNNING, content_fee=content_fee, analytics_manager=self.analytics_manager ) log.info("starting download for %s", uri) try: await asyncio.wait_for(stream.setup( self.node, save_file=save_file, file_name=file_name, download_directory=download_directory ), timeout, loop=self.loop) except asyncio.TimeoutError: if not stream.descriptor: raise DownloadSDTimeout(stream.sd_hash) raise DownloadDataTimeout(stream.sd_hash) finally: if stream.descriptor: if to_replace: # delete old stream now that the replacement has started downloading await self.delete_stream(to_replace) stream.set_claim(resolved, claim) await self.storage.save_content_claim(stream.stream_hash, outpoint) self.streams[stream.sd_hash] = stream return stream except DownloadDataTimeout as err: # forgive data timeout, dont delete stream error = err raise except Exception as err: error = err if stream and stream.descriptor: await self.storage.delete_stream(stream.descriptor) await self.blob_manager.delete_blob(stream.sd_hash) finally: if self.analytics_manager and (error or (stream and (stream.downloader.time_to_descriptor or stream.downloader.time_to_first_bytes))): 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), 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__ ) ) if error: raise error