211 lines
7.8 KiB
Python
211 lines
7.8 KiB
Python
import json
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import logging
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from twisted.protocols.basic import FileSender
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from twisted.internet.protocol import Protocol, ClientFactory
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from twisted.internet import defer, error
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from lbrynet.reflector.common import IncompleteResponse, REFLECTOR_V2
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log = logging.getLogger(__name__)
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class BlobReflectorClient(Protocol):
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# Protocol stuff
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def connectionMade(self):
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self.blob_manager = self.factory.blob_manager
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self.response_buff = b''
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self.outgoing_buff = ''
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self.blob_hashes_to_send = self.factory.blobs
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self.next_blob_to_send = None
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self.blob_read_handle = None
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self.received_handshake_response = False
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self.protocol_version = self.factory.protocol_version
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self.file_sender = None
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self.producer = None
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self.streaming = False
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self.reflected_blobs = []
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d = self.send_handshake()
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d.addErrback(
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lambda err: log.warning("An error occurred immediately: %s", err.getTraceback()))
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def dataReceived(self, data):
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log.debug('Received %s', data)
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self.response_buff += data
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try:
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msg = self.parse_response(self.response_buff)
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except IncompleteResponse:
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pass
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else:
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self.response_buff = b''
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d = self.handle_response(msg)
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d.addCallback(lambda _: self.send_next_request())
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d.addErrback(self.response_failure_handler)
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def connectionLost(self, reason):
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if reason.check(error.ConnectionDone):
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if self.reflected_blobs:
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log.info('Finished sending data via reflector')
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self.factory.finished_deferred.callback(self.reflected_blobs)
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else:
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log.info('Reflector finished: %s', reason)
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self.factory.finished_deferred.callback(reason)
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# IConsumer stuff
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def registerProducer(self, producer, streaming):
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self.producer = producer
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self.streaming = streaming
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if self.streaming is False:
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from twisted.internet import reactor
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reactor.callLater(0, self.producer.resumeProducing)
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def unregisterProducer(self):
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self.producer = None
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def write(self, data):
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self.transport.write(data)
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if self.producer is not None and self.streaming is False:
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from twisted.internet import reactor
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reactor.callLater(0, self.producer.resumeProducing)
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def send_handshake(self):
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log.debug('Sending handshake')
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self.write(json.dumps({'version': self.protocol_version}).encode())
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return defer.succeed(None)
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def parse_response(self, buff):
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try:
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return json.loads(buff)
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except ValueError:
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raise IncompleteResponse()
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def response_failure_handler(self, err):
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log.warning("An error occurred handling the response: %s", err.getTraceback())
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def handle_response(self, response_dict):
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if self.received_handshake_response is False:
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return self.handle_handshake_response(response_dict)
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else:
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return self.handle_normal_response(response_dict)
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def set_not_uploading(self):
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if self.next_blob_to_send is not None:
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self.read_handle.close()
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self.read_handle = None
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self.next_blob_to_send = None
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self.file_sender = None
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return defer.succeed(None)
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def start_transfer(self):
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assert self.read_handle is not None, \
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"self.read_handle was None when trying to start the transfer"
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d = self.file_sender.beginFileTransfer(self.read_handle, self)
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d.addCallback(lambda _: self.read_handle.close())
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return d
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def handle_handshake_response(self, response_dict):
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if 'version' not in response_dict:
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raise ValueError("Need protocol version number!")
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server_version = int(response_dict['version'])
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if self.protocol_version != server_version:
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raise ValueError(f"I can't handle protocol version {self.protocol_version}!")
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self.received_handshake_response = True
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return defer.succeed(True)
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def handle_normal_response(self, response_dict):
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if self.file_sender is None: # Expecting Server Info Response
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if 'send_blob' not in response_dict:
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raise ValueError("I don't know whether to send the blob or not!")
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if response_dict['send_blob'] is True:
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self.file_sender = FileSender()
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return defer.succeed(True)
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else:
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return self.set_not_uploading()
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else: # Expecting Server Blob Response
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if 'received_blob' not in response_dict:
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raise ValueError("I don't know if the blob made it to the intended destination!")
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else:
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if response_dict['received_blob']:
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self.reflected_blobs.append(self.next_blob_to_send.blob_hash)
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return self.set_not_uploading()
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def open_blob_for_reading(self, blob):
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if blob.get_is_verified():
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read_handle = blob.open_for_reading()
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if read_handle is not None:
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log.debug('Getting ready to send %s', blob.blob_hash)
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self.next_blob_to_send = blob
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self.read_handle = read_handle
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return None
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raise ValueError(
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f"Couldn't open that blob for some reason. blob_hash: {blob.blob_hash}")
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def send_blob_info(self):
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log.debug("Send blob info for %s", self.next_blob_to_send.blob_hash)
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assert self.next_blob_to_send is not None, "need to have a next blob to send at this point"
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log.debug('sending blob info')
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self.write(json.dumps({
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'blob_hash': self.next_blob_to_send.blob_hash,
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'blob_size': self.next_blob_to_send.length
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}).encode())
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def disconnect(self, err):
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self.transport.loseConnection()
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def send_next_request(self):
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if self.file_sender is not None:
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# send the blob
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log.debug('Sending the blob')
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return self.start_transfer()
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elif self.blob_hashes_to_send:
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# open the next blob to send
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blob_hash = self.blob_hashes_to_send[0]
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log.debug('No current blob, sending the next one: %s', blob_hash)
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self.blob_hashes_to_send = self.blob_hashes_to_send[1:]
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d = self.blob_manager.get_blob(blob_hash)
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d.addCallback(self.open_blob_for_reading)
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# send the server the next blob hash + length
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d.addCallbacks(
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lambda _: self.send_blob_info(),
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errback=log.fail(self.disconnect),
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errbackArgs=("Error reflecting blob %s", blob_hash)
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)
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return d
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else:
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# close connection
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log.debug('No more blob hashes, closing connection')
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self.transport.loseConnection()
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class BlobReflectorClientFactory(ClientFactory):
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protocol = BlobReflectorClient
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def __init__(self, blob_manager, blobs):
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self.protocol_version = REFLECTOR_V2
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self.blob_manager = blob_manager
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self.blobs = blobs
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self.p = None
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self.finished_deferred = defer.Deferred()
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def buildProtocol(self, addr):
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p = self.protocol()
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p.factory = self
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self.p = p
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return p
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def startFactory(self):
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log.debug('Starting reflector factory')
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ClientFactory.startFactory(self)
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def startedConnecting(self, connector):
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log.debug('Started connecting')
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def clientConnectionLost(self, connector, reason):
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"""If we get disconnected, reconnect to server."""
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log.debug("connection lost: %s", reason.getErrorMessage())
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def clientConnectionFailed(self, connector, reason):
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log.debug("connection failed: %s", reason.getErrorMessage())
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