lbry-sdk/lbrynet/reflector/server/server.py

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import logging
from twisted.python import failure
from twisted.internet import error, defer
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from twisted.internet.protocol import Protocol, ServerFactory
import json
from lbrynet.core.utils import is_valid_blobhash
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log = logging.getLogger(__name__)
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class ReflectorServer(Protocol):
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def connectionMade(self):
peer_info = self.transport.getPeer()
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log.debug('Connection made to %s', peer_info)
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self.peer = self.factory.peer_manager.get_peer(peer_info.host, peer_info.port)
self.blob_manager = self.factory.blob_manager
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self.received_handshake = False
self.peer_version = None
self.receiving_blob = False
self.incoming_blob = None
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self.blob_write = None
self.blob_finished_d = None
self.cancel_write = None
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self.request_buff = ""
def connectionLost(self, reason=failure.Failure(error.ConnectionDone())):
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log.info("Reflector upload from %s finished" % self.peer.host)
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def dataReceived(self, data):
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if self.receiving_blob:
self.blob_write(data)
else:
log.debug('Not yet recieving blob, data needs further processing')
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self.request_buff += data
msg, extra_data = self._get_valid_response(self.request_buff)
if msg is not None:
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self.request_buff = ''
d = self.handle_request(msg)
d.addCallbacks(self.send_response, self.handle_error)
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if self.receiving_blob and extra_data:
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log.debug('Writing extra data to blob')
self.blob_write(extra_data)
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def _get_valid_response(self, response_msg):
extra_data = None
response = None
curr_pos = 0
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while True:
next_close_paren = response_msg.find('}', curr_pos)
if next_close_paren != -1:
curr_pos = next_close_paren + 1
try:
response = json.loads(response_msg[:curr_pos])
except ValueError:
if curr_pos > 100:
raise Exception("error decoding response")
else:
pass
else:
extra_data = response_msg[curr_pos:]
break
else:
break
return response, extra_data
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def handle_request(self, request_dict):
if self.received_handshake is False:
return self.handle_handshake(request_dict)
else:
return self.handle_normal_request(request_dict)
def handle_handshake(self, request_dict):
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log.debug('Handling handshake')
if 'version' not in request_dict:
raise ValueError("Client should send version")
self.peer_version = int(request_dict['version'])
if self.peer_version != 0:
raise ValueError("I don't know that version!")
self.received_handshake = True
return defer.succeed({'version': 0})
def determine_blob_needed(self, blob):
if blob.is_validated():
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return {'send_blob': False}
else:
self.incoming_blob = blob
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self.blob_finished_d, self.blob_write, self.cancel_write = blob.open_for_writing(self.peer) # pylint: disable=line-too-long
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self.blob_finished_d.addCallback(lambda _: self.blob_manager.blob_completed(blob))
return {'send_blob': True}
def close_blob(self):
self.blob_finished_d = None
self.blob_write = None
self.cancel_write = None
self.incoming_blob = None
self.receiving_blob = False
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def handle_normal_request(self, request_dict):
if self.blob_write is None:
# we haven't opened a blob yet, meaning we must be waiting for the
# next message containing a blob hash and a length. this message
# should be it. if it's one we want, open the blob for writing, and
# return a nice response dict (in a Deferred) saying go ahead
if not 'blob_hash' in request_dict or not 'blob_size' in request_dict:
raise ValueError("Expected a blob hash and a blob size")
if not is_valid_blobhash(request_dict['blob_hash']):
raise ValueError("Got a bad blob hash: {}".format(request_dict['blob_hash']))
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log.debug('Recieved info for blob: %s', request_dict['blob_hash'])
d = self.blob_manager.get_blob(
request_dict['blob_hash'],
True,
int(request_dict['blob_size'])
)
d.addCallback(self.determine_blob_needed)
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else:
# we have a blob open already, so this message should have nothing
# important in it. to the deferred that fires when the blob is done,
# add a callback which returns a nice response dict saying to keep
# sending, and then return that deferred
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log.debug('blob is already open')
self.receiving_blob = True
d = self.blob_finished_d
d.addCallback(lambda _: self.close_blob())
d.addCallback(lambda _: {'received_blob': True})
return d
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def send_response(self, response_dict):
self.transport.write(json.dumps(response_dict))
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def handle_error(self, err):
log.error(err.getTraceback())
self.transport.loseConnection()
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class ReflectorServerFactory(ServerFactory):
protocol = ReflectorServer
def __init__(self, peer_manager, blob_manager):
self.peer_manager = peer_manager
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self.blob_manager = blob_manager
def buildProtocol(self, addr):
log.debug('Creating a protocol for %s', addr)
return ServerFactory.buildProtocol(self, addr)