346 lines
14 KiB
Python
346 lines
14 KiB
Python
import json
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import logging
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from twisted.internet.error import ConnectionRefusedError
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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, ReflectorRequestError
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from lbrynet.reflector.common import REFLECTOR_V1, REFLECTOR_V2
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log = logging.getLogger(__name__)
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class EncryptedFileReflectorClient(Protocol):
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# Protocol stuff
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def connectionMade(self):
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log.debug("Connected to reflector")
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self.response_buff = b''
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self.outgoing_buff = b''
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self.blob_hashes_to_send = []
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self.failed_blob_hashes = []
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self.next_blob_to_send = None
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self.read_handle = None
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self.sent_stream_info = False
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self.received_descriptor_response = False
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self.received_server_version = False
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self.server_version = None
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self.stream_descriptor = None
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self.descriptor_needed = None
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self.needed_blobs = []
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self.reflected_blobs = []
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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.blob_manager = self.factory.blob_manager
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self.protocol_version = self.factory.protocol_version
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self.stream_hash = self.factory.stream_hash
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self.sd_hash = self.factory.sd_hash
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d = self.load_descriptor()
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d.addCallback(lambda _: self.send_handshake())
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d.addErrback(lambda err: log.warning("An error occurred immediately: %s", err.getTraceback()))
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def dataReceived(self, 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 store_result(self, result):
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if not self.needed_blobs or len(self.reflected_blobs) == len(self.needed_blobs):
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reflected = True
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else:
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reflected = False
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d = self.blob_manager.storage.update_reflected_stream(self.sd_hash, self.transport.getPeer().host, reflected)
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d.addCallback(lambda _: result)
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return d
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def connectionLost(self, reason):
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# make sure blob file readers get closed
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self.set_not_uploading()
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if reason.check(error.ConnectionDone):
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if not self.needed_blobs:
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log.info("Reflector has all blobs for %s", self.stream_descriptor)
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elif not self.reflected_blobs:
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log.info("No more completed blobs for %s to reflect, %i are still needed",
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self.stream_descriptor, len(self.needed_blobs))
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else:
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log.info('Finished sending reflector %i blobs for %s',
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len(self.reflected_blobs), self.stream_descriptor)
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result = self.reflected_blobs
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elif reason.check(error.ConnectionLost):
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log.warning("Stopped reflecting %s after sending %i blobs",
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self.stream_descriptor, len(self.reflected_blobs))
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result = self.reflected_blobs
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else:
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log.info('Reflector finished for %s: %s', self.stream_descriptor,
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reason)
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result = reason
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self.factory.finished_deferred.addCallback(self.store_result)
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self.factory.finished_deferred.callback(result)
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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 get_validated_blobs(self, blobs_in_stream):
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def get_blobs(blobs):
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for crypt_blob in blobs:
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if crypt_blob.blob_hash and crypt_blob.length:
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yield self.blob_manager.get_blob(crypt_blob.blob_hash, crypt_blob.length)
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dl = defer.DeferredList(list(get_blobs(blobs_in_stream)), consumeErrors=True)
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dl.addCallback(lambda blobs: [blob for r, blob in blobs if r and blob.get_is_verified()])
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return dl
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def set_blobs_to_send(self, blobs_to_send):
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for blob in blobs_to_send:
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if blob.blob_hash not in self.blob_hashes_to_send:
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self.blob_hashes_to_send.append(blob.blob_hash)
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def get_blobs_to_send(self):
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def _show_missing_blobs(filtered):
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if filtered:
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needs_desc = "" if not self.descriptor_needed else "descriptor and "
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log.info("Reflector needs %s%i blobs for stream",
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needs_desc,
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len(filtered))
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return filtered
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d = self.factory.blob_manager.storage.get_blobs_for_stream(self.stream_hash)
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d.addCallback(self.get_validated_blobs)
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if not self.descriptor_needed:
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d.addCallback(lambda filtered:
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[blob for blob in filtered if blob.blob_hash in self.needed_blobs])
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d.addCallback(_show_missing_blobs)
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d.addCallback(self.set_blobs_to_send)
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d.addCallback(lambda _: None if self.descriptor_needed else self.set_not_uploading())
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return d
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def send_request(self, request_dict):
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self.write(json.dumps(request_dict).encode())
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def send_handshake(self):
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self.send_request({'version': self.protocol_version})
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@defer.inlineCallbacks
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def load_descriptor(self):
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if self.sd_hash:
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self.stream_descriptor = yield self.factory.blob_manager.get_blob(self.sd_hash)
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else:
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raise ValueError("no sd hash for stream %s" % self.stream_hash)
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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 not self.received_server_version:
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return self.handle_handshake_response(response_dict)
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elif not self.received_descriptor_response and self.server_version == REFLECTOR_V2:
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return self.handle_descriptor_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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log.debug("Close %s", self.next_blob_to_send)
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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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if self.file_sender is not None:
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self.file_sender.stopProducing()
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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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self.server_version = int(response_dict['version'])
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if self.server_version not in [REFLECTOR_V1, REFLECTOR_V2]:
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raise ValueError(f"I can't handle protocol version {self.server_version}!")
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self.received_server_version = True
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return defer.succeed(True)
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def handle_descriptor_response(self, response_dict):
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if self.file_sender is None: # Expecting Server Info Response
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if 'send_sd_blob' not in response_dict:
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raise ReflectorRequestError("I don't know whether to send the sd blob or not!")
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if response_dict['send_sd_blob'] is True:
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self.file_sender = FileSender()
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else:
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self.received_descriptor_response = True
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self.descriptor_needed = response_dict['send_sd_blob']
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self.needed_blobs = response_dict.get('needed_blobs', [])
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return self.get_blobs_to_send()
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else: # Expecting Server Blob Response
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if 'received_sd_blob' not in response_dict:
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raise ValueError("I don't know if the sd blob made it to the intended destination!")
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else:
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self.received_descriptor_response = True
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disconnect = False
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if response_dict['received_sd_blob']:
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self.reflected_blobs.append(self.next_blob_to_send.blob_hash)
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log.info("Sent reflector descriptor %s", self.next_blob_to_send)
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else:
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log.warning("Reflector failed to receive descriptor %s",
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self.next_blob_to_send)
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disconnect = True
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d = self.set_not_uploading()
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if disconnect:
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d.addCallback(lambda _: self.transport.loseConnection())
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return d
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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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log.info("Reflector already has %s", self.next_blob_to_send)
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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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log.debug("Sent reflector blob %s", self.next_blob_to_send)
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else:
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log.warning("Reflector failed to receive blob %s", self.next_blob_to_send)
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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 defer.succeed(None)
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return defer.fail(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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assert self.next_blob_to_send is not None, "need to have a next blob to send at this point"
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r = {
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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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}
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self.send_request(r)
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def send_descriptor_info(self):
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assert self.stream_descriptor is not None, "need to have a sd blob to send at this point"
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r = {
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'sd_blob_hash': self.stream_descriptor.blob_hash,
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'sd_blob_size': self.stream_descriptor.length
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}
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self.sent_stream_info = True
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self.send_request(r)
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def skip_missing_blob(self, err, blob_hash):
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err.trap(ValueError)
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if blob_hash not in self.failed_blob_hashes:
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log.warning("Failed to reflect blob %s, reason: %s",
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str(blob_hash)[:16], err.getTraceback())
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self.blob_hashes_to_send.append(blob_hash)
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self.failed_blob_hashes.append(blob_hash)
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else:
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log.warning("Failed second try reflecting blob %s, giving up, reason: %s",
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str(blob_hash)[:16], err.getTraceback())
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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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return self.start_transfer()
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elif not self.sent_stream_info:
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# open the sd blob to send
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blob = self.stream_descriptor
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d = self.open_blob_for_reading(blob)
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d.addCallbacks(lambda _: self.send_descriptor_info(),
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lambda err: self.skip_missing_blob(err, blob.blob_hash))
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return d
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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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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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d.addCallbacks(lambda _: self.send_blob_info(),
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lambda err: self.skip_missing_blob(err, blob.blob_hash))
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return d
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# close connection
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self.transport.loseConnection()
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class EncryptedFileReflectorClientFactory(ClientFactory):
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protocol = EncryptedFileReflectorClient
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protocol_version = REFLECTOR_V2
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def __init__(self, blob_manager, stream_hash, sd_hash):
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self.blob_manager = blob_manager
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self.stream_hash = stream_hash
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self.sd_hash = sd_hash
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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('Connecting to reflector')
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def clientConnectionLost(self, connector, reason):
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"""If we get disconnected, reconnect to server."""
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def clientConnectionFailed(self, connector, reason):
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if reason.check(ConnectionRefusedError):
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log.warning("Could not connect to reflector server")
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else:
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log.error("Reflector connection failed: %s", reason)
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