89 lines
3.8 KiB
Python
89 lines
3.8 KiB
Python
import asyncio
|
|
import typing
|
|
import logging
|
|
from lbrynet.utils import resolve_host
|
|
from lbrynet.stream.assembler import StreamAssembler
|
|
from lbrynet.stream.descriptor import StreamDescriptor
|
|
from lbrynet.blob_exchange.downloader import BlobDownloader
|
|
from lbrynet.dht.peer import KademliaPeer
|
|
if typing.TYPE_CHECKING:
|
|
from lbrynet.conf import Config
|
|
from lbrynet.dht.node import Node
|
|
from lbrynet.blob.blob_manager import BlobFileManager
|
|
from lbrynet.blob.blob_file import BlobFile
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
def drain_into(a: list, b: list):
|
|
while a:
|
|
b.append(a.pop())
|
|
|
|
|
|
class StreamDownloader(StreamAssembler):
|
|
def __init__(self, loop: asyncio.BaseEventLoop, config: 'Config', blob_manager: 'BlobFileManager', sd_hash: str,
|
|
output_dir: typing.Optional[str] = None, output_file_name: typing.Optional[str] = None):
|
|
super().__init__(loop, blob_manager, sd_hash)
|
|
self.config = config
|
|
self.output_dir = output_dir or self.config.download_dir
|
|
self.output_file_name = output_file_name
|
|
self.blob_downloader: typing.Optional[BlobDownloader] = None
|
|
self.search_queue = asyncio.Queue(loop=loop)
|
|
self.peer_queue = asyncio.Queue(loop=loop)
|
|
self.accumulate_task: typing.Optional[asyncio.Task] = None
|
|
self.descriptor: typing.Optional[StreamDescriptor]
|
|
self.node: typing.Optional['Node'] = None
|
|
self.assemble_task: typing.Optional[asyncio.Task] = None
|
|
self.fixed_peers_handle: typing.Optional[asyncio.Handle] = None
|
|
|
|
async def setup(self): # start the peer accumulator and initialize the downloader
|
|
if self.blob_downloader:
|
|
raise Exception("downloader is already set up")
|
|
if self.node:
|
|
_, self.accumulate_task = self.node.accumulate_peers(self.search_queue, self.peer_queue)
|
|
self.blob_downloader = BlobDownloader(self.loop, self.config, self.blob_manager, self.peer_queue)
|
|
self.search_queue.put_nowait(self.sd_hash)
|
|
|
|
async def after_got_descriptor(self):
|
|
self.search_queue.put_nowait(self.descriptor.blobs[0].blob_hash)
|
|
log.info("added head blob to search")
|
|
|
|
async def after_finished(self):
|
|
log.info("downloaded stream %s -> %s", self.sd_hash, self.output_path)
|
|
await self.blob_manager.storage.change_file_status(self.descriptor.stream_hash, 'finished')
|
|
|
|
def stop(self):
|
|
if self.accumulate_task:
|
|
self.accumulate_task.cancel()
|
|
self.accumulate_task = None
|
|
if self.assemble_task:
|
|
self.assemble_task.cancel()
|
|
self.assemble_task = None
|
|
if self.fixed_peers_handle:
|
|
self.fixed_peers_handle.cancel()
|
|
self.fixed_peers_handle = None
|
|
self.blob_downloader = None
|
|
|
|
async def get_blob(self, blob_hash: str, length: typing.Optional[int] = None) -> 'BlobFile':
|
|
return await self.blob_downloader.download_blob(blob_hash, length)
|
|
|
|
def add_fixed_peers(self):
|
|
async def _add_fixed_peers():
|
|
self.peer_queue.put_nowait([
|
|
KademliaPeer(self.loop, address=(await resolve_host(url)), tcp_port=port + 1)
|
|
for url, port in self.config.reflector_servers
|
|
])
|
|
if self.config.reflector_servers:
|
|
self.fixed_peers_handle = self.loop.call_later(
|
|
self.config.fixed_peer_delay if (
|
|
'dht' not in self.config.components_to_skip
|
|
and self.node
|
|
and len(self.node.protocol.routing_table.get_peers())
|
|
) else 0.0,
|
|
lambda: self.loop.create_task(_add_fixed_peers())
|
|
)
|
|
|
|
def download(self, node: typing.Optional['Node'] = None):
|
|
self.node = node
|
|
self.assemble_task = self.loop.create_task(self.assemble_decrypted_stream(self.config.download_dir))
|
|
self.add_fixed_peers()
|