forked from LBRYCommunity/lbry-sdk
205 lines
10 KiB
Python
205 lines
10 KiB
Python
import asyncio
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import logging
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import typing
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import binascii
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from lbrynet.error import InvalidBlobHashError, InvalidDataError
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from lbrynet.blob_exchange.serialization import BlobResponse, BlobRequest
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if typing.TYPE_CHECKING:
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from lbrynet.blob.blob_file import BlobFile
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from lbrynet.blob.writer import HashBlobWriter
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log = logging.getLogger(__name__)
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class BlobExchangeClientProtocol(asyncio.Protocol):
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def __init__(self, loop: asyncio.BaseEventLoop, peer_timeout: typing.Optional[float] = 10):
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self.loop = loop
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self.peer_port: typing.Optional[int] = None
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self.peer_address: typing.Optional[str] = None
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self.peer_timeout = peer_timeout
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self.transport: asyncio.Transport = None
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self.writer: 'HashBlobWriter' = None
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self.blob: 'BlobFile' = None
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self._blob_bytes_received = 0
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self._response_fut: asyncio.Future = None
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self.buf = b''
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def data_received(self, data: bytes):
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log.debug("%s:%d -- got %s bytes -- %s bytes on buffer -- %s blob bytes received",
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self.peer_address, self.peer_port, len(data), len(self.buf), self._blob_bytes_received)
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if not self.transport or self.transport.is_closing():
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log.warning("transport closing, but got more bytes from %s:%i\n%s", self.peer_address, self.peer_port,
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binascii.hexlify(data))
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if self._response_fut and not self._response_fut.done():
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self._response_fut.cancel()
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return
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if self._blob_bytes_received and not self.writer.closed():
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return self._write(data)
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response = BlobResponse.deserialize(self.buf + data)
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if not response.responses and not self._response_fut.done():
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self.buf += data
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return
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else:
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self.buf = b''
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if response.responses and self.blob:
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blob_response = response.get_blob_response()
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if blob_response and not blob_response.error and blob_response.blob_hash == self.blob.blob_hash:
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# set the expected length for the incoming blob if we didn't know it
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self.blob.set_length(blob_response.length)
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elif blob_response and not blob_response.error and self.blob.blob_hash != blob_response.blob_hash:
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# the server started sending a blob we didn't request
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log.warning("mismatch with self.blob %s", self.blob.blob_hash)
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return
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if response.responses:
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log.debug("got response from %s:%i <- %s", self.peer_address, self.peer_port, response.to_dict())
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# fire the Future with the response to our request
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self._response_fut.set_result(response)
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if response.blob_data and self.writer and not self.writer.closed():
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# log.debug("got %i blob bytes from %s:%i", len(response.blob_data), self.peer_address, self.peer_port)
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# write blob bytes if we're writing a blob and have blob bytes to write
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self._write(response.blob_data)
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def _write(self, data):
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if len(data) > (self.blob.get_length() - self._blob_bytes_received):
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data = data[:(self.blob.get_length() - self._blob_bytes_received)]
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log.warning("got more than asked from %s:%d, probable sendfile bug", self.peer_address, self.peer_port)
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else:
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data = data
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self._blob_bytes_received += len(data)
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try:
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self.writer.write(data)
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except IOError as err:
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log.error("error downloading blob from %s:%i: %s", self.peer_address, self.peer_port, err)
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if self._response_fut and not self._response_fut.done():
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self._response_fut.set_exception(err)
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except (asyncio.TimeoutError) as err: # TODO: is this needed?
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log.error("%s downloading blob from %s:%i", str(err), self.peer_address, self.peer_port)
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if self._response_fut and not self._response_fut.done():
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self._response_fut.set_exception(err)
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async def _download_blob(self) -> typing.Tuple[int, typing.Optional[asyncio.Transport]]:
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"""
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:return: download success (bool), keep connection (bool)
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"""
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request = BlobRequest.make_request_for_blob_hash(self.blob.blob_hash)
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try:
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msg = request.serialize()
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log.debug("send request to %s:%i -> %s", self.peer_address, self.peer_port, msg.decode())
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self.transport.write(msg)
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response: BlobResponse = await asyncio.wait_for(self._response_fut, self.peer_timeout, loop=self.loop)
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availability_response = response.get_availability_response()
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price_response = response.get_price_response()
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blob_response = response.get_blob_response()
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if (not blob_response or blob_response.error) and\
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(not availability_response or not availability_response.available_blobs):
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log.warning("%s not in availability response from %s:%i", self.blob.blob_hash, self.peer_address,
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self.peer_port)
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log.warning(response.to_dict())
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return self._blob_bytes_received, self.close()
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elif availability_response.available_blobs and \
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availability_response.available_blobs != [self.blob.blob_hash]:
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log.warning("blob availability response doesn't match our request from %s:%i",
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self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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if not price_response or price_response.blob_data_payment_rate != 'RATE_ACCEPTED':
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log.warning("data rate rejected by %s:%i", self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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if not blob_response or blob_response.error:
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log.warning("blob cant be downloaded from %s:%i", self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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if not blob_response.error and blob_response.blob_hash != self.blob.blob_hash:
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log.warning("incoming blob hash mismatch from %s:%i", self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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if self.blob.length is not None and self.blob.length != blob_response.length:
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log.warning("incoming blob unexpected length from %s:%i", self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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msg = f"downloading {self.blob.blob_hash[:8]} from {self.peer_address}:{self.peer_port}," \
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f" timeout in {self.peer_timeout}"
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log.debug(msg)
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msg = f"downloaded {self.blob.blob_hash[:8]} from {self.peer_address}:{self.peer_port}"
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await asyncio.wait_for(self.writer.finished, self.peer_timeout, loop=self.loop)
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log.info(msg)
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# await self.blob.finished_writing.wait() not necessary, but a dangerous change. TODO: is it needed?
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return self._blob_bytes_received, self.transport
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except asyncio.TimeoutError:
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return self._blob_bytes_received, self.close()
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except (InvalidBlobHashError, InvalidDataError):
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log.warning("invalid blob from %s:%i", self.peer_address, self.peer_port)
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return self._blob_bytes_received, self.close()
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def close(self):
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if self._response_fut and not self._response_fut.done():
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self._response_fut.cancel()
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if self.writer and not self.writer.closed():
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self.writer.close_handle()
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self._response_fut = None
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self.writer = None
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self.blob = None
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if self.transport:
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self.transport.close()
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self.transport = None
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self.buf = b''
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async def download_blob(self, blob: 'BlobFile') -> typing.Tuple[int, typing.Optional[asyncio.Transport]]:
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if blob.get_is_verified() or blob.file_exists or blob.blob_write_lock.locked():
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return 0, self.transport
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try:
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self.blob, self.writer, self._blob_bytes_received = blob, blob.open_for_writing(), 0
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self._response_fut = asyncio.Future(loop=self.loop)
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return await self._download_blob()
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except OSError as e:
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log.error("race happened downloading from %s:%i", self.peer_address, self.peer_port)
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# i'm not sure how to fix this race condition - jack
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log.exception(e)
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return self._blob_bytes_received, self.transport
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except asyncio.TimeoutError:
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if self._response_fut and not self._response_fut.done():
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self._response_fut.cancel()
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self.close()
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return self._blob_bytes_received, None
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except asyncio.CancelledError:
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self.close()
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raise
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def connection_made(self, transport: asyncio.Transport):
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self.transport = transport
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self.peer_address, self.peer_port = self.transport.get_extra_info('peername')
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log.debug("connection made to %s:%i", self.peer_address, self.peer_port)
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def connection_lost(self, reason):
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log.debug("connection lost to %s:%i (reason: %s, %s)", self.peer_address, self.peer_port, str(reason),
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str(type(reason)))
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self.close()
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async def request_blob(loop: asyncio.BaseEventLoop, blob: 'BlobFile', address: str, tcp_port: int,
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peer_connect_timeout: float, blob_download_timeout: float,
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connected_transport: asyncio.Transport = None)\
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-> typing.Tuple[int, typing.Optional[asyncio.Transport]]:
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"""
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Returns [<downloaded blob>, <keep connection>]
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"""
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protocol = BlobExchangeClientProtocol(loop, blob_download_timeout)
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if connected_transport and not connected_transport.is_closing():
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connected_transport.set_protocol(protocol)
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protocol.connection_made(connected_transport)
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log.debug("reusing connection for %s:%d", address, tcp_port)
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else:
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connected_transport = None
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try:
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if not connected_transport:
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await asyncio.wait_for(loop.create_connection(lambda: protocol, address, tcp_port),
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peer_connect_timeout, loop=loop)
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if blob.get_is_verified() or blob.file_exists:
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# file exists but not verified means someone is writing right now, give it time, come back later
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return 0, connected_transport
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return await protocol.download_blob(blob)
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except (asyncio.TimeoutError, ConnectionRefusedError, ConnectionAbortedError, OSError):
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return 0, None
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