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centrechat.py
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centrechat.py
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import socket
import select
import time
import thread
import threading
import random
class packet:
def __init__(self, request):
self.request = request
self.sequenceNumber = None
self.contentLength = None
self.userName = None
self.sender = None
self.content = ""
def getRequest(self):
return self.request
def getSequenceNumber(self):
return self.sequenceNumber
def getContentLength(self):
return self.contentLength
def getUserName(self):
return self.userName
def getSender(self):
return self.sender
def getContent(self):
return self.content
def setRequest(self, request):
self.request = request
def setSequenceNumber(self, sq):
self.sequenceNumber = str(sq)
def setContentLength(self, length):
self.contentLength = str(length)
def setUserName(self, name):
self.userName = name
def setSender(self, sender):
self.sender = sender
def setContent(self, content):
self.content = content
def getString(self):
toReturn = ""
tmpList1 = [self.request, self.sequenceNumber, self.contentLength, self.userName, self.sender]
tmpList2 = ["", "Sequence-Number: ", "Content-Length: ", "User-Name: ", "Sender: "]
for i in range(5):
if (tmpList1[i] != None):
toReturn += (tmpList2[i] + tmpList1[i] + "\r\n")
toReturn += (self.content + "\r\n##")
return toReturn
#format header content
def parsePacket(pck):
toReturn = packet(pck[:pck.find("\r\n")])
if (pck.find("\r\nSequence-Number: ") != -1):
toReturn.setSequenceNumber(pck[pck.find("\r\nSequence-Number: ")+ 19:pck.find("\r\n",pck.find("\r\nSequence-Number: ") + 17)])
##print toReturn.getSequenceNumber()
if (pck.find("\r\nContent-Length: ") != -1):
toReturn.setContentLength(pck[pck.find("\r\nContent-Length: ")+ 18:pck.find("\r\n",pck.find("\r\nContent-Length: ") + 16)])
##print toReturn.getContentLength()
if (pck.find("\r\nUser-Name: ") != -1):
toReturn.setUserName(pck[pck.find("\r\nUser-Name: ")+ 13:pck.find("\r\n",pck.find("\r\nUser-Name: ") + 11)])
##print toReturn.getUserName()
if (pck.find("\r\nSender: ") != -1):
toReturn.setSender(pck[pck.find("\r\nSender: ")+ 10:pck.find("\r\n",pck.find("\r\nSender: ") + 8)])
##print toReturn.getSender()
if (toReturn.getContentLength() != None):
l = int(toReturn.getContentLength())
toReturn.setContent(pck[-l - 4 : pck.find("\r\n##")])
##print toReturn.getContent()
##print toReturn.getString()
return toReturn
#--------------------------------------------------------------
class clientInfo:
def __init__(self, name, glSQ, address):
self.name = name
self.globalSQ = glSQ
self.ACK = -1 #acknoledgement num is -1 by default, 0 is the first ack recieved
self.SQ = 0
self.address = address
#---------------------------------------------------------------
class ChatServer:
def __init__(self, port, ip = "127.0.0.1"):
self.clients = [] ## a list of clientInfo
self.globalSQ = 0
self.address = (ip, port)
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(self.address)
print self.sock.getsockname()[1]
#gets all client names in alphabetical order
def getClients(self):
l = []
for client in self.clients:
l.append(client.name)
l.sort()
return l
def handleMessages(self):
while True:
rlist, wlist, elist = select.select([self.sock], [], [])
pckString, clientAddress = rlist[0].recvfrom(1024)
pck = parsePacket(pckString)
print "\n-----------------------" + pckString + "---------------------\n"
if (pck.request == "CG"):
print "CG from " + str(clientAddress)
self.handleCG(pck, clientAddress)
if (pck.request == "CLOSE"):
print "CLOSE from " + str(clientAddress)
self.handleCLOSE(pck, clientAddress)
if (pck.request == "MSG"):
self.handleMSG(pck, clientAddress)
if (pck.request == "ACK"):
self.handleACK(pck, clientAddress)
#set up connection with client
def handleCG(self, pck, clientAddress):
CC = packet("CC")
CC.setSequenceNumber(self.globalSQ)
CC.setUserName(pck.getUserName())
stringCC = CC.getString()
self.sock.sendto(stringCC, clientAddress)
tmpClient = clientInfo(pck.getUserName(), self.globalSQ, clientAddress)
for client in self.clients:
if client.address == tmpClient.address:
self.clients.remove(client)
break
self.clients.append(tmpClient)
print pck.getUserName() + " connected to the server\n"
def handleCLOSE(self, pck, clientAddress):
CLOSE = packet("CLOSE")
CLOSE.setUserName(pck.getUserName())
stringCLOSE = CLOSE.getString()
self.sock.sendto(stringCLOSE, clientAddress)
for client in self.clients:
if client.address == clientAddress:
self.clients.remove(client)
break
print pck.getUserName() + " left\n"
def handleMSG(self, pck, clientAddress):
print "\nMSG from " + pck.getSender() + "\n"
sq = int(pck.getSequenceNumber())
tmpClient = None
#if the message is from an existing client, respond with correct ack
#otherwise discard message
for client in self.clients:
if (client.address == clientAddress):
tmpClient = client
break
if (tmpClient == None):
return
ACK = packet("ACK")
ACK.setSender("SERVER")
##ACK.setSequenceNumber(sq)
if (sq == tmpClient.SQ):
tmpClient.SQ += 1
self.broadcast(pck)
print "sending ACK to " + pck.getSender() + "\n"
ACK.setSequenceNumber(tmpClient.SQ - 1)
self.sock.sendto(ACK.getString(), clientAddress)
if (sq < tmpClient.SQ):
print "sending ACK to " + pck.getSender() + "\n"
ACK.setSequenceNumber(tmpClient.SQ - 1)
self.sock.sendto(ACK.getString(), clientAddress)
else:
print "discard packet!"
def broadcast(self, pck):
pck.setSequenceNumber(self.globalSQ)
sq = int(pck.getSequenceNumber())
self.globalSQ += 1
thread.start_new_thread(self.threadBroadcast,(pck, sq,))
def threadBroadcast(self, pck, sq):
tmpList = []
for client in self.clients:
tmpList.append(client)
for i in range(7):
for client in tmpList:
if (client in self.clients):
if (client.ACK < sq):
print "broadcast to " + client.name
self.sock.sendto(pck.getString(), client.address)
else:
tmpList.remove(client)
else:
tmpList.remove(client)
if (tmpList == []):
print "\nbroadcasted\n"
return
time.sleep(0.4)
for c in tmpList:
print "\nbroadcasting failed to " + c.name
if (c in self.clients):
self.clients.remove(c)
print c.name + " is removed from the clients"
def handleACK(self, pck, clientAddress):
tmpList = []
for client in self.clients:
tmpList.append(client)
for client in tmpList:
if (client.address == clientAddress):
if (int(pck.getSequenceNumber()) > client.ACK):
client.ACK = int(pck.getSequenceNumber())
print "ACK from " + client.name
break
#----------------------------------------------------------
class ChatClient:
def __init__(self, ip, port, name):
self.lock = threading.RLock()
self.windowSize = 5 ## how many threads are used for sending messages
self.rcvBuffer = [] ## buffer for getMessage()
self.sendingThreadCount = 0 ## count for current sending thread
self.sqToServer = 0 ## sq# for th pck sending to server
self.ackFromServer = -1 ## sq# for the ACK from server
self.sqFromServer = 0 ## sq# for the pck from server (global sq#)
self.userName = name ## userName displayed to server and other clinets
self.connected = False
self.serverAddress = (ip, port)
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind(("", 0))
self.address = ("127.0.0.1", self.sock.getsockname()[1])
print self.address
self.connectServer()
def connectServer(self):
self.sqToServer = 0
self.ackFromServer = -1
self.sqFromServer = 0
self.sendingThreadCount = 0
CG = packet("CG")
CG.setUserName(self.userName)
stringCG = CG.getString()
inputList = [self.sock]
for i in range(5):
self.sock.sendto(stringCG, self.serverAddress)
rlist, wlist, elist = select.select(inputList, [], [],1)
if len(rlist) == 0:
print "connection timeout! count: ",i
else:
tmpString = rlist[0].recv(2048) # may want to check the address here
CC = parsePacket(tmpString)
self.sqFromServer = int(CC.getSequenceNumber()) # may want to also check the user name here
print "connected to server.."
self.connected = True
break
def privatedisconnect(self):
CLOSE = packet("CLOSE")
CLOSE.setUserName(self.userName)
stringCLOSE = CLOSE.getString()
inputList = [self.sock]
for i in range(3):
self.sock.sendto(stringCLOSE, self.serverAddress)
rlist, wlist, elist = select.select(inputList, [], [],1)
if len(rlist) == 0:
print "disconnection timeout! count: ",i
else:
tmpString = rlist[0].recv(2048) # may want to check the address here
CLOSE = parsePacket(tmpString)
if (CLOSE.request == "ACK"):
i = 1 - 1
self.ackFromServer = int(CLOSE.getSequenceNumber())
if (CLOSE.request == "CLOSE"):
print "disconnected from the server.."
self.connected = False
break
if (self.connected):
self.connected = False
print "disconnected"
self.sqToServer = 0
self.ackFromServer = 0
self.sqFromServer = 0
self.sendingThreadCount = 0
def sendMessage(self,msg):
if len(msg) > 1000:
print "message too large"
return
MSG = packet("MSG")
MSG.setContent(msg)
MSG.setSequenceNumber(str(self.sqToServer))
MSG.setSender(self.userName)
MSG.setContentLength(len(MSG.getContent()))
self.sqToServer += 1
while True:
if ((int(MSG.getSequenceNumber()) - self.ackFromServer) < self.windowSize):
print "\nsending:\n" + MSG.getString() + "\n"
thread.start_new_thread(self.thread_send, (MSG,))
break
else:
if self.connected:
print "waiting for window"
time.sleep(0.5)
else:
return
def lossySend(self,msg): # use lossy_thread_send
MSG = packet("MSG")
MSG.setContent(msg)
MSG.setSequenceNumber(str(self.sqToServer))
MSG.setSender(self.userName)
MSG.setContentLength(len(MSG.getContent()))
self.sqToServer += 1
while True:
if ((int(MSG.getSequenceNumber()) - self.ackFromServer) < self.windowSize):
print "\nsending:\n" + MSG.getString() + "\n"
thread.start_new_thread(self.lossy_thread_send, (MSG,))
break
else:
if self.connected:
print "waiting for window"
time.sleep(0.5)
else:
return
def lossy_thread_send(self, msgPCK):
for i in range(6): ##to have a better chance get all the messages sent
if (self.connected):
if random.randint(1,5) >= 3:
self.sock.sendto(msgPCK.getString(),self.serverAddress)
time.sleep(1)## can work on this
if (self.ackFromServer >= int(msgPCK.getSequenceNumber())):
print "\n" + "msg" + " sent\n"
return
print "\ntimeout, resend\n"
else:
print "not connected to server"
return
self.disconnect()
def thread_send(self, msgPCK):
for i in range(3):
if (self.connected):
self.sock.sendto(msgPCK.getString(),self.serverAddress)
time.sleep(1)## can work on this
if (self.ackFromServer >= int(msgPCK.getSequenceNumber())):
print "\n" + "msg" + " sent\n"
return
print "\ntimeout, resend\n"
else:
print "not connected to server"
return
self.disconnect()
def handleMessages(self):
print "start handling messages"
while True:
rlist, wlist, elist = select.select([self.sock], [], [])
pckString = rlist[0].recv(2048) ## same as discard
if (self.connected):
pck = parsePacket(pckString)
if (pck.request == "CMD"):
print "\nGot a CMD\n"
self.handleCMD(pck)
if (pck.request == "ACK"):
self.handleACK(pck)
if (pck.request == "MSG"):
self.handleMSG(pck)
def handleCMD(self, pck):
if (pck.content == "disconnect"):
print "\nHandling CMD for disconnection\n"
self.privatedisconnect()
def handleACK(self, pck):
newACK = int(pck.getSequenceNumber())
if (newACK > self.ackFromServer):
self.ackFromServer = newACK
def getMessage(self):
##print "locked by get"
self.lock.acquire()
if len(self.rcvBuffer) > 0:
toReturn = self.rcvBuffer[0]
self.rcvBuffer.remove(toReturn)
self.lock.release()
##print "unlocked by get"
return toReturn
else:
self.lock.release()
##print "unlocked by get"
return None
def handleMSG(self, pck):
sq = int(pck.getSequenceNumber())
ACK = packet("ACK")
ACK.setSender(self.userName)
##ACK.setSequenceNumber(sq)
tmpMSG = (pck.getSender(), pck.getContent())
if (sq == self.sqFromServer):
self.sqFromServer += 1
##print "locked by handle"
self.lock.acquire()
self.rcvBuffer.append(tmpMSG)
self.lock.release()
##print "unlocked by handle"
print "\ngot a msg\n"
print "sending a ack"
ACK.setSequenceNumber(self.sqFromServer - 1)
self.sock.sendto(ACK.getString(), self.serverAddress)
elif (sq < self.sqFromServer):
ACK.setSequenceNumber(self.sqFromServer - 1)
self.sock.sendto(ACK.getString(), self.serverAddress)
else:
print "discard packet!"
def disconnect(self):
CMD = packet("CMD")
CMD.setContent("disconnect")
CMD.setContentLength(len(CMD.getContent()))
self.sock.sendto(CMD.getString(), self.address)
print "\nCMD sent for disconnecting\n"