import os import asyncio import typing import binascii import logging import random from lbrynet.error import ResolveError, InvalidStreamDescriptorError from lbrynet.stream.downloader import StreamDownloader from lbrynet.stream.managed_stream import ManagedStream from lbrynet.schema.claim import ClaimDict from lbrynet.schema.uri import parse_lbry_uri from lbrynet.schema.decode import smart_decode from lbrynet.extras.daemon.storage import lbc_to_dewies if typing.TYPE_CHECKING: from lbrynet.conf import Config from lbrynet.blob.blob_manager import BlobFileManager from lbrynet.dht.node import Node from lbrynet.extras.daemon.storage import SQLiteStorage from lbrynet.extras.wallet import LbryWalletManager from lbrynet.extras.daemon.exchange_rate_manager import ExchangeRateManager log = logging.getLogger(__name__) filter_fields = [ '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, } class StreamManager: def __init__(self, loop: asyncio.BaseEventLoop, config: 'Config', blob_manager: 'BlobFileManager', wallet: 'LbryWalletManager', storage: 'SQLiteStorage', node: typing.Optional['Node']): self.loop = loop self.config = config self.blob_manager = blob_manager self.wallet = wallet self.storage = storage self.node = node self.streams: typing.Set[ManagedStream] = set() self.starting_streams: typing.Dict[str, asyncio.Future] = {} self.resume_downloading_task: asyncio.Task = None self.re_reflect_task: asyncio.Task = None self.update_stream_finished_futs: typing.List[asyncio.Future] = [] async def _update_content_claim(self, stream: ManagedStream): claim_info = await self.storage.get_content_claim(stream.stream_hash) stream.set_claim(claim_info, smart_decode(claim_info['value'])) async def start_stream(self, stream: ManagedStream) -> bool: """ Resume or rebuild a partial or completed stream """ path = os.path.join(stream.download_directory, stream.file_name) if not stream.running and not os.path.isfile(path): if stream.downloader: stream.downloader.stop() stream.downloader = None # the directory is gone, can happen when the folder that contains a published file is deleted # reset the download directory to the default and update the file name if not os.path.isdir(stream.download_directory): stream.download_directory = self.config.download_dir stream.downloader = self.make_downloader( stream.sd_hash, stream.download_directory, stream.descriptor.suggested_file_name ) if stream.status != ManagedStream.STATUS_FINISHED: await self.storage.change_file_status(stream.stream_hash, 'running') stream.update_status('running') stream.start_download(self.node) try: await asyncio.wait_for(self.loop.create_task(stream.downloader.got_descriptor.wait()), self.config.download_timeout) except asyncio.TimeoutError: await self.stop_stream(stream) if stream in self.streams: self.streams.remove(stream) return False file_name = os.path.basename(stream.downloader.output_path) await self.storage.change_file_download_dir_and_file_name( stream.stream_hash, self.config.download_dir, file_name ) self.wait_for_stream_finished(stream) return True return True async def stop_stream(self, stream: ManagedStream): stream.stop_download() if not stream.finished and os.path.isfile(stream.full_path): 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) def make_downloader(self, sd_hash: str, download_directory: str, file_name: str): return StreamDownloader( self.loop, self.config, self.blob_manager, sd_hash, download_directory, file_name ) async def add_stream(self, sd_hash: str, file_name: str, download_directory: str, status: str, claim): sd_blob = self.blob_manager.get_blob(sd_hash) if sd_blob.get_is_verified(): try: descriptor = await self.blob_manager.get_stream_descriptor(sd_blob.blob_hash) except InvalidStreamDescriptorError as err: log.warning("Failed to start stream for sd %s - %s", sd_hash, str(err)) return downloader = self.make_downloader(descriptor.sd_hash, download_directory, file_name) stream = ManagedStream( self.loop, self.blob_manager, descriptor, download_directory, file_name, downloader, status, claim ) self.streams.add(stream) self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) async def load_streams_from_database(self): file_infos = await self.storage.get_all_lbry_files() await asyncio.gather(*[ self.add_stream( file_info['sd_hash'], binascii.unhexlify(file_info['file_name']).decode(), binascii.unhexlify(file_info['download_directory']).decode(), file_info['status'], file_info['claim'] ) for file_info in file_infos ]) log.info("Started stream manager with %i files", len(file_infos)) async def resume(self): if not self.node: log.warning("no DHT node given, cannot resume downloads") return await self.node.joined.wait() t = [ stream.start_download(self.node) for stream in self.streams if stream.status == ManagedStream.STATUS_RUNNING ] if t: log.info("resuming %i downloads", len(t)) async def reflect_streams(self): while True: if self.config.reflector_servers: sd_hashes = await self.storage.get_streams_to_re_reflect() streams = list(filter(lambda s: s.sd_hash in sd_hashes, self.streams)) batch = [] while streams: stream = streams.pop() 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) batch = [] if batch: await asyncio.gather(*batch) 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.pop() stream.stop_download() while self.update_stream_finished_futs: self.update_stream_finished_futs.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.blob_manager, file_path, key, iv_generator) self.streams.add(stream) self.storage.content_claim_callbacks[stream.stream_hash] = lambda: self._update_content_claim(stream) if self.config.reflector_servers: host, port = random.choice(self.config.reflector_servers) self.loop.create_task(stream.upload_to_reflector(host, port)) return stream async def delete_stream(self, stream: ManagedStream, delete_file: typing.Optional[bool] = False): await self.stop_stream(stream) if stream in self.streams: self.streams.remove(stream) 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 os.path.isfile(stream.full_path): os.remove(stream.full_path) def wait_for_stream_finished(self, stream: ManagedStream): async def _wait_for_stream_finished(): if stream.downloader and stream.running: try: await stream.downloader.stream_finished_event.wait() stream.update_status(ManagedStream.STATUS_FINISHED) except asyncio.CancelledError: pass task = self.loop.create_task(_wait_for_stream_finished()) self.update_stream_finished_futs.append(task) task.add_done_callback( lambda _: None if task not in self.update_stream_finished_futs else self.update_stream_finished_futs.remove(task) ) async def _download_stream_from_claim(self, node: 'Node', download_directory: str, claim_info: typing.Dict, file_name: typing.Optional[str] = None) -> typing.Optional[ManagedStream]: claim = smart_decode(claim_info['value']) downloader = StreamDownloader(self.loop, self.config, self.blob_manager, claim.source_hash.decode(), download_directory, file_name) try: downloader.download(node) await downloader.got_descriptor.wait() log.info("got descriptor %s for %s", claim.source_hash.decode(), claim_info['name']) except (asyncio.TimeoutError, asyncio.CancelledError): log.info("stream timeout") downloader.stop() log.info("stopped stream") return file_name = os.path.basename(downloader.output_path) download_directory = os.path.dirname(downloader.output_path) if not await self.blob_manager.storage.stream_exists(downloader.sd_hash): await self.blob_manager.storage.store_stream(downloader.sd_blob, downloader.descriptor) if not await self.blob_manager.storage.file_exists(downloader.sd_hash): await self.blob_manager.storage.save_downloaded_file( downloader.descriptor.stream_hash, file_name, download_directory, 0.0 ) await self.blob_manager.storage.save_content_claim( downloader.descriptor.stream_hash, f"{claim_info['txid']}:{claim_info['nout']}" ) stream = ManagedStream(self.loop, self.blob_manager, downloader.descriptor, download_directory, file_name, downloader, ManagedStream.STATUS_RUNNING) stream.set_claim(claim_info, claim) self.streams.add(stream) try: await stream.downloader.wrote_bytes_event.wait() self.wait_for_stream_finished(stream) return stream except asyncio.CancelledError: downloader.stop() log.debug("stopped stream") async def download_stream_from_claim(self, node: 'Node', claim_info: typing.Dict, file_name: typing.Optional[str] = None, timeout: typing.Optional[float] = 60, fee_amount: typing.Optional[float] = 0.0, fee_address: typing.Optional[str] = None, should_pay: typing.Optional[bool] = True) -> typing.Optional[ManagedStream]: claim = ClaimDict.load_dict(claim_info['value']) sd_hash = claim.source_hash.decode() if sd_hash in self.starting_streams: return await self.starting_streams[sd_hash] already_started = tuple(filter(lambda s: s.descriptor.sd_hash == sd_hash, self.streams)) if already_started: return already_started[0] if should_pay and fee_address and fee_amount and fee_amount > await self.wallet.default_account.get_balance(): raise Exception("not enough funds") self.starting_streams[sd_hash] = asyncio.Future(loop=self.loop) stream_task = self.loop.create_task( self._download_stream_from_claim(node, self.config.download_dir, claim_info, file_name) ) try: await asyncio.wait_for(stream_task, timeout or self.config.download_timeout) stream = await stream_task self.starting_streams[sd_hash].set_result(stream) if should_pay and fee_address and fee_amount: await self.wallet.send_amount_to_address(lbc_to_dewies(str(fee_amount)), fee_address.encode('latin1')) return stream except (asyncio.TimeoutError, asyncio.CancelledError): return finally: if sd_hash in self.starting_streams: del self.starting_streams[sd_hash] 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)) 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") 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: for search, val in search_by.items(): if search == 'full_status': continue if comparison_operators[comparison](getattr(stream, search), val): streams.append(stream) break else: streams = list(self.streams) if sort_by: streams.sort(key=lambda s: getattr(s, sort_by)) if reverse: streams.reverse() return streams async def download_stream_from_uri(self, uri, exchange_rate_manager: 'ExchangeRateManager', file_name: typing.Optional[str] = None, timeout: typing.Optional[float] = None) -> typing.Optional[ManagedStream]: timeout = timeout or self.config.download_timeout parsed_uri = parse_lbry_uri(uri) if parsed_uri.is_channel: raise Exception("cannot download a channel claim, specify a /path") resolved = (await self.wallet.resolve(uri)).get(uri, {}) resolved = resolved if 'value' in resolved else resolved.get('claim') if not resolved: raise ResolveError( "Failed to resolve stream at lbry://{}".format(uri.replace("lbry://", "")) ) if 'error' in resolved: raise ResolveError(f"error resolving stream: {resolved['error']}") claim = ClaimDict.load_dict(resolved['value']) fee_amount, fee_address = None, None if claim.has_fee: fee_amount = round(exchange_rate_manager.convert_currency( claim.source_fee.currency, "LBC", claim.source_fee.amount ), 5) fee_address = claim.source_fee.address.decode() outpoint = f"{resolved['txid']}:{resolved['nout']}" existing = self.get_filtered_streams(outpoint=outpoint) if not existing: existing.extend(self.get_filtered_streams(sd_hash=claim.source_hash.decode())) if existing and existing[0].claim_id != resolved['claim_id']: raise Exception(f"stream for {existing[0].claim_id} collides with existing " f"download {resolved['claim_id']}") elif not existing: existing.extend(self.get_filtered_streams(claim_id=resolved['claim_id'])) if existing and existing[0].sd_hash != claim.source_hash.decode(): log.info("claim contains an update to a stream we have, downloading it") stream = await self.download_stream_from_claim( self.node, resolved, file_name, timeout, fee_amount, fee_address, False ) log.info("started new stream, deleting old one") await self.delete_stream(existing[0]) return stream elif existing: log.info("already have matching stream for %s", uri) stream = existing[0] await self.start_stream(stream) return stream else: stream = existing[0] await self.start_stream(stream) return stream log.info("download stream from %s", uri) return await self.download_stream_from_claim( self.node, resolved, file_name, timeout, fee_amount, fee_address )