import errno import time import threading import Queue from struct import unpack, pack import hashlib import random import sys import socket from helper_generic import addDataPadding from class_objectHashHolder import * from addresses import * from debug import logger 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.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 = streamNumber self.services = 0 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 self.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, self.streamNumber, 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): while data: if ((self.services & protocol.NODE_SSL == protocol.NODE_SSL) and self.connectionIsOrWasFullyEstablished and protocol.haveSSL(not self.initiatedConnection)): while state.shutdown == 0: try: amountSent = self.sslSock.send(data[:4096]) break except socket.error as e: if e.errno == errno.EAGAIN: continue raise else: while True: try: amountSent = self.sock.send(data[:4096]) break except socket.error as e: if e.errno == errno.EAGAIN: continue raise throttle.SendThrottle().wait(amountSent) self.lastTimeISentData = int(time.time()) data = data[amountSent:] def run(self): logger.debug('sendDataThread starting. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues))) while True: deststream, command, data = self.sendDataThreadQueue.get() if deststream == self.streamNumber or deststream == 0: 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 in the sendData thread (ID: ' + str(id(self)) + ') to ' + str(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': try: self.sendBytes(data) 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 else: logger.error('sendDataThread ID: ' + str(id(self)) + ' ignoring command ' + command + ' because the thread is not in stream' + str(deststream)) 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) logger.info('sendDataThread ending. ID: ' + str(id(self)) + '. Number of queues in sendDataQueues: ' + str(len(state.sendDataQueues))) self.objectHashHolderInstance.close()