106 lines
4.6 KiB
Python
106 lines
4.6 KiB
Python
import asyncio
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import typing
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import logging
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from lbrynet.utils import drain_tasks
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from lbrynet.blob_exchange.client import request_blob
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if typing.TYPE_CHECKING:
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from lbrynet.conf import Config
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from lbrynet.dht.node import Node
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from lbrynet.dht.peer import KademliaPeer
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from lbrynet.blob.blob_manager import BlobFileManager
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from lbrynet.blob.blob_file import BlobFile
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log = logging.getLogger(__name__)
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def drain_into(a: list, b: list):
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while a:
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b.append(a.pop())
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class BlobDownloader:
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def __init__(self, loop: asyncio.BaseEventLoop, config: 'Config', blob_manager: 'BlobFileManager',
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peer_queue: asyncio.Queue):
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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.peer_queue = peer_queue
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self.active_connections: typing.Dict['KademliaPeer', asyncio.Task] = {} # active request_blob calls
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self.ignored: typing.Set['KademliaPeer'] = set()
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self.scores: typing.Dict['KademliaPeer', int] = {}
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def request_blob_from_peer(self, blob: 'BlobFile', peer: 'KademliaPeer'):
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async def _request_blob():
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if blob.get_is_verified():
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return
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success, keep_connection = await request_blob(
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self.loop, blob, peer.address, peer.tcp_port, self.config.peer_connect_timeout,
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self.config.blob_download_timeout
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)
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if not keep_connection and peer not in self.ignored:
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self.ignored.add(peer)
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log.debug("drop peer %s:%i", peer.address, peer.tcp_port)
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elif keep_connection:
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log.debug("keep peer %s:%i", peer.address, peer.tcp_port)
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if success:
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self.scores[peer] = self.scores.get(peer, 0) + 2
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else:
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self.scores[peer] = self.scores.get(peer, 0) - 1
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return self.loop.create_task(_request_blob())
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async def new_peer_or_finished(self, blob: 'BlobFile'):
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async def get_and_re_add_peers():
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new_peers = await self.peer_queue.get()
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self.peer_queue.put_nowait(new_peers)
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tasks = [self.loop.create_task(get_and_re_add_peers()), self.loop.create_task(blob.verified.wait())]
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try:
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await asyncio.wait(tasks, loop=self.loop, return_when='FIRST_COMPLETED')
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except asyncio.CancelledError:
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drain_tasks(tasks)
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raise
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async def download_blob(self, blob_hash: str, length: typing.Optional[int] = None) -> 'BlobFile':
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blob = self.blob_manager.get_blob(blob_hash, length)
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if blob.get_is_verified():
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return blob
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try:
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while not blob.get_is_verified():
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batch: typing.List['KademliaPeer'] = []
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while not self.peer_queue.empty():
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batch.extend(await self.peer_queue.get())
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for peer in batch:
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if len(self.active_connections) >= self.config.max_connections_per_download:
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break
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if peer not in self.active_connections and peer not in self.ignored:
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log.debug("request %s from %s:%i", blob_hash[:8], peer.address, peer.tcp_port)
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self.active_connections[peer] = self.request_blob_from_peer(blob, peer)
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await self.new_peer_or_finished(blob)
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to_re_add = list(set(filter(lambda peer: peer not in self.ignored, batch)))
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to_re_add.sort(key=lambda peer: self.scores.get(peer, 0), reverse=True)
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if to_re_add:
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self.peer_queue.put_nowait(to_re_add)
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while self.active_connections:
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peer, task = self.active_connections.popitem()
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if task and not task.done():
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task.cancel()
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await blob.close()
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return blob
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except asyncio.CancelledError:
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while self.active_connections:
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peer, task = self.active_connections.popitem()
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if task and not task.done():
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task.cancel()
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raise
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async def download_blob(loop, config: 'Config', blob_manager: 'BlobFileManager', node: 'Node',
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blob_hash: str) -> 'BlobFile':
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search_queue = asyncio.Queue(loop=loop, maxsize=config.max_connections_per_download)
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search_queue.put_nowait(blob_hash)
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peer_queue, accumulate_task = node.accumulate_peers(search_queue)
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downloader = BlobDownloader(loop, config, blob_manager, peer_queue)
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try:
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return await downloader.download_blob(blob_hash)
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finally:
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if accumulate_task and not accumulate_task.done():
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accumulate_task.cancel()
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