Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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import errno
import time
import threading
import Queue
from struct import unpack, pack
import hashlib
import random
import select
import socket
from ssl import SSLError, SSL_ERROR_WANT_WRITE
import sys
from helper_generic import addDataPadding
from class_objectHashHolder import *
from addresses import *
from debug import logger
from inventory import PendingUpload
import protocol
import state
import throttle
# Every connection to a peer has a sendDataThread (and also a
# receiveDataThread).
class sendDataThread(threading.Thread):
def __init__(self, sendDataThreadQueue):
threading.Thread.__init__(self, name="sendData")
self.sendDataThreadQueue = sendDataThreadQueue
state.sendDataQueues.append(self.sendDataThreadQueue)
self.data = ''
self.objectHashHolderInstance = objectHashHolder(self.sendDataThreadQueue)
self.objectHashHolderInstance.daemon = True
self.objectHashHolderInstance.start()
self.connectionIsOrWasFullyEstablished = False
def setup(
self,
sock,
HOST,
PORT,
streamNumber,
someObjectsOfWhichThisRemoteNodeIsAlreadyAware):
self.sock = sock
self.peer = state.Peer(HOST, PORT)
self.name = "sendData-" + self.peer.host.replace(":", ".") # log parser field separator
self.streamNumber = []
self.services = 0
self.buffer = ""
self.initiatedConnection = False
self.remoteProtocolVersion = - \
1 # This must be set using setRemoteProtocolVersion command which is sent through the self.sendDataThreadQueue queue.
self.lastTimeISentData = int(
time.time()) # If this value increases beyond five minutes ago, we'll send a pong message to keep the connection alive.
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware = someObjectsOfWhichThisRemoteNodeIsAlreadyAware
if streamNumber == -1: # This was an incoming connection.
self.initiatedConnection = False
else:
self.initiatedConnection = True
#logger.debug('The streamNumber of this sendDataThread (ID: ' + str(id(self)) + ') at setup() is' + str(self.streamNumber))
def sendVersionMessage(self):
datatosend = protocol.assembleVersionMessage(
self.peer.host, self.peer.port, state.streamsInWhichIAmParticipating, not self.initiatedConnection) # the IP and port of the remote host, and my streamNumber.
logger.debug('Sending version packet: ' + repr(datatosend))
try:
self.sendBytes(datatosend)
except Exception as err:
# if not 'Bad file descriptor' in err:
logger.error('sock.sendall error: %s\n' % err)
self.versionSent = 1
def sendBytes(self, data = ""):
self.buffer += data
if len(self.buffer) < throttle.SendThrottle().chunkSize and self.sendDataThreadQueue.qsize() > 1:
return True
while self.buffer and state.shutdown == 0:
isSSL = False
try:
if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and
self.connectionIsOrWasFullyEstablished and
protocol.haveSSL(not self.initiatedConnection)):
isSSL = True
amountSent = self.sslSock.send(self.buffer[:throttle.SendThrottle().chunkSize])
else:
amountSent = self.sock.send(self.buffer[:throttle.SendThrottle().chunkSize])
except socket.timeout:
continue
except SSLError as e:
if e.errno == SSL_ERROR_WANT_WRITE:
select.select([], [self.sslSock], [], 10)
logger.debug('sock.recv retriable SSL error')
continue
raise
except socket.error as e:
if e.errno in (errno.EAGAIN, errno.EWOULDBLOCK) or \
(sys.platform.startswith('win') and \
e.errno == errno.WSAEWOULDBLOCK):
select.select([], [self.sslSock if isSSL else self.sock], [], 10)
logger.debug('sock.recv retriable error')
continue
if e.errno == errno.EPIPE:
logger.debug('Connection broken')
return False
raise
throttle.SendThrottle().wait(amountSent)
self.lastTimeISentData = int(time.time())
self.buffer = self.buffer[amountSent:]
return True
def run(self):
logger.debug('sendDataThread starting. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues)))
while self.sendBytes():
deststream, command, data = self.sendDataThreadQueue.get()
if deststream == 0 or deststream in self.streamNumber:
if command == 'shutdown':
logger.debug('sendDataThread (associated with ' + str(self.peer) + ') ID: ' + str(id(self)) + ' shutting down now.')
break
# When you receive an incoming connection, a sendDataThread is
# created even though you don't yet know what stream number the
# remote peer is interested in. They will tell you in a version
# message and if you too are interested in that stream then you
# will continue on with the connection and will set the
# streamNumber of this send data thread here:
elif command == 'setStreamNumber':
self.streamNumber = data
logger.debug('setting the stream number to %s', ', '.join(str(x) for x in self.streamNumber))
elif command == 'setRemoteProtocolVersion':
specifiedRemoteProtocolVersion = data
logger.debug('setting the remote node\'s protocol version in the sendDataThread (ID: ' + str(id(self)) + ') to ' + str(specifiedRemoteProtocolVersion))
self.remoteProtocolVersion = specifiedRemoteProtocolVersion
elif command == 'advertisepeer':
self.objectHashHolderInstance.holdPeer(data)
elif command == 'sendaddr':
if self.connectionIsOrWasFullyEstablished: # only send addr messages if we have sent and heard a verack from the remote node
numberOfAddressesInAddrMessage = len(data)
payload = ''
for hostDetails in data:
timeLastReceivedMessageFromThisNode, streamNumber, services, host, port = hostDetails
payload += pack(
'>Q', timeLastReceivedMessageFromThisNode) # now uses 64-bit time
payload += pack('>I', streamNumber)
payload += pack(
'>q', services) # service bit flags offered by this node
payload += protocol.encodeHost(host)
payload += pack('>H', port)
payload = encodeVarint(numberOfAddressesInAddrMessage) + payload
packet = protocol.CreatePacket('addr', payload)
try:
self.sendBytes(packet)
except:
logger.error('sendaddr: self.sock.sendall failed')
break
elif command == 'advertiseobject':
self.objectHashHolderInstance.holdHash(data)
elif command == 'sendinv':
if self.connectionIsOrWasFullyEstablished: # only send inv messages if we have send and heard a verack from the remote node
payload = ''
for hash in data:
if hash not in self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware:
payload += hash
if payload != '':
payload = encodeVarint(len(payload)/32) + payload
packet = protocol.CreatePacket('inv', payload)
try:
self.sendBytes(packet)
except:
logger.error('sendinv: self.sock.sendall failed')
break
elif command == 'pong':
self.someObjectsOfWhichThisRemoteNodeIsAlreadyAware.clear() # To save memory, let us clear this data structure from time to time. As its function is to help us keep from sending inv messages to peers which sent us the same inv message mere seconds earlier, it will be fine to clear this data structure from time to time.
if self.lastTimeISentData < (int(time.time()) - 298):
# Send out a pong message to keep the connection alive.
logger.debug('Sending pong to ' + str(self.peer) + ' to keep connection alive.')
packet = protocol.CreatePacket('pong')
try:
self.sendBytes(packet)
except:
logger.error('send pong failed')
break
elif command == 'sendRawData':
hash = None
if type(data) in [list, tuple]:
hash, data = data
try:
self.sendBytes(data)
PendingUpload().delete(hash)
except:
logger.error('Sending of data to ' + str(self.peer) + ' failed. sendDataThread thread ' + str(self) + ' ending now.', exc_info=True)
break
elif command == 'connectionIsOrWasFullyEstablished':
self.connectionIsOrWasFullyEstablished = True
self.services, self.sslSock = data
elif self.connectionIsOrWasFullyEstablished:
logger.error('sendDataThread ID: ' + str(id(self)) + ' ignoring command ' + command + ' because the thread is not in stream ' + str(deststream) + ' but in streams ' + ', '.join(str(x) for x in self.streamNumber))
self.sendDataThreadQueue.task_done()
self.sendDataThreadQueue.task_done()
try:
self.sock.shutdown(socket.SHUT_RDWR)
self.sock.close()
except:
pass
state.sendDataQueues.remove(self.sendDataThreadQueue)
PendingUpload().threadEnd()
logger.info('sendDataThread ending. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues)))
self.objectHashHolderInstance.close()