lbry-sdk/lbrynet/blob_exchange/client.py

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import asyncio
import logging
import typing
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import binascii
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from lbrynet.blob_exchange.serialization import BlobResponse, BlobRequest
if typing.TYPE_CHECKING:
from lbrynet.blob.blob_file import BlobFile
from lbrynet.blob.writer import HashBlobWriter
log = logging.getLogger(__name__)
class BlobExchangeClientProtocol(asyncio.Protocol):
def __init__(self, loop: asyncio.BaseEventLoop, peer_timeout: typing.Optional[float] = 10):
self.loop = loop
self.peer_port: typing.Optional[int] = None
self.peer_address: typing.Optional[str] = None
self.peer_timeout = peer_timeout
self.transport: asyncio.Transport = None
self.writer: 'HashBlobWriter' = None
self.blob: 'BlobFile' = None
self._blob_bytes_received = 0
self._response_fut: asyncio.Future = None
self._request_lock = asyncio.Lock(loop=self.loop)
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def data_received(self, data: bytes):
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if not self.transport or self.transport.is_closing():
log.warning("transport closing, but got more bytes from %s:%i\n%s", self.peer_address, self.peer_port,
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()
return
response = BlobResponse.deserialize(data)
if response.responses and self.blob:
blob_response = response.get_blob_response()
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)
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)
return
if response.responses:
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log.debug("got response from %s:%i <- %s", self.peer_address, self.peer_port, response.to_dict())
# fire the Future with the response to our request
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self._response_fut.set_result(response)
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)
# write blob bytes if we're writing a blob and have blob bytes to write
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self._blob_bytes_received += len(response.blob_data)
try:
self.writer.write(response.blob_data)
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return
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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)
if self._response_fut and not self._response_fut.done():
self._response_fut.set_exception(err)
except (asyncio.CancelledError, asyncio.TimeoutError) as err: # TODO: is this needed?
log.error("%s downloading blob from %s:%i", str(err), self.peer_address, self.peer_port)
if self._response_fut and not self._response_fut.done():
self._response_fut.set_exception(err)
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async def _download_blob(self) -> typing.Tuple[bool, bool]:
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"""
:return: download success (bool), keep connection (bool)
"""
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request = BlobRequest.make_request_for_blob_hash(self.blob.blob_hash)
try:
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msg = request.serialize()
log.debug("send request to %s:%i -> %s", self.peer_address, self.peer_port, msg.decode())
self.transport.write(msg)
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response: BlobResponse = await asyncio.wait_for(self._response_fut, self.peer_timeout, loop=self.loop)
availability_response = response.get_availability_response()
price_response = response.get_price_response()
blob_response = response.get_blob_response()
if (not blob_response or blob_response.error) and\
(not availability_response or not availability_response.available_blobs):
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log.warning("blob not in availability response from %s:%i", self.peer_address, self.peer_port)
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return False, True
elif availability_response.available_blobs and \
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",
self.peer_address, self.peer_port)
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return False, False
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 False, False
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 False, True
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 False, False
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 False, False
msg = f"downloading {self.blob.blob_hash[:8]} from {self.peer_address}:{self.peer_port}," \
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)
await self.blob.finished_writing.wait()
log.info(msg)
return True, True
except asyncio.CancelledError:
return False, True
except asyncio.TimeoutError:
return False, False
finally:
await self.close()
async def close(self):
if self._response_fut and not self._response_fut.done():
self._response_fut.cancel()
if self.writer and not self.writer.closed():
self.writer.close_handle()
if self.blob:
await self.blob.close()
self._response_fut = None
self.writer = None
self.blob = None
if self.transport:
self.transport.close()
self.transport = None
async def download_blob(self, blob: 'BlobFile') -> typing.Tuple[bool, bool]:
if blob.get_is_verified():
return False, True
async with self._request_lock:
try:
self.blob, self.writer, self._blob_bytes_received = blob, blob.open_for_writing(), 0
self._response_fut = asyncio.Future(loop=self.loop)
return await self._download_blob()
except OSError:
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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
return False, True
except asyncio.TimeoutError:
if self._response_fut and not self._response_fut.done():
self._response_fut.cancel()
return False, False
except asyncio.CancelledError:
if self._response_fut and not self._response_fut.done():
self._response_fut.cancel()
return False, True
def connection_made(self, transport: asyncio.Transport):
self.transport = transport
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),
str(type(reason)))
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self.transport = None
self.loop.create_task(self.close())
async def request_blob(loop: asyncio.BaseEventLoop, blob: 'BlobFile', protocol: 'BlobExchangeClientProtocol',
address: str, tcp_port: int, peer_connect_timeout: float) -> typing.Tuple[bool, bool]:
"""
Returns [<downloaded blob>, <keep connection>]
"""
if blob.get_is_verified():
return False, True
try:
await asyncio.wait_for(loop.create_connection(lambda: protocol, address, tcp_port),
peer_connect_timeout, loop=loop)
return await protocol.download_blob(blob)
except (asyncio.TimeoutError, asyncio.CancelledError, ConnectionRefusedError, ConnectionAbortedError, OSError):
return False, False