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()