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weschat-server.py
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198 lines (180 loc) · 6.3 KB
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import socket, select
server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_sock.bind(("0.0.0.0", 8888))
server_sock.listen(16)
CONNECTIONS = [server_sock]
UNAMES = {}
class Room:
def __init__(self, name):
self.name = name
self.users = []
def admit(self, user):
self.users.append(user)
self.send(user, "You have entered the room "+self.name)
def expel(self, user):
try:
self.send(user, "You have left the room "+self.name)
self.users.remove(user)
except:
pass
def recv(self, message):
#print(self.users)
for user in self.users:
self.send(user, message)
def lookupSocket(self, user):
for connection in CONNECTIONS:
try:
if connection.getpeername() == user:
return connection
except:
pass
return None
def send(self, user, message):
sock = self.lookupSocket(user)
try:
sock.send((message+"\n").encode("UTF-8"))
except AttributeError:
pass # Not a socket
except:
sock.close()
self.expel(user)
CONNECTIONS.remove(user)
def lookupUser(self, user):
return user in self.users
def autoExpel(self):
for user in self.users:
if self.lookupSocket(user) == None:
self.users.remove(user)
if len(self.users) == 0 and self.name != "hall": # Hall never closes
rooms.remove(self)
def broadcast(sock, message):
message = bytes(message, "UTF-8")
for s in CONNECTIONS:
if s != server_sock:
try:
s.send(message)
except:
try: # Sometimes it can't be closed...
s.close()
CONNECTIONS.remove(s)
except:
pass
def name(addr):
#print(UNAMES)
if addr in UNAMES.keys():
return UNAMES[addr]
else:
return str(addr)
hall = Room("hall")
rooms = [hall]
def roomLookup(name):
for room in rooms:
if room.name == name:
return room
return None
def lookupUser(user):
for room in rooms:
if user in room.users:
return room
return None
## COMMANDS
class Commander:
def __init__(self):
self.COMMANDS = {
"/uname":self.uname,
"/join":self.join,
"/help":self.help,
"/room":self.room
}
def uname(self, data, addr, sock):
uname = data[7:].strip("\r\n")
UNAMES[addr] = uname
def join(self, data, addr, sock):
currentRoom = lookupUser(addr)
currentRoom.expel(addr)
rname = data[6:].strip("\r\n")
room = roomLookup(rname)
if room == None:
room = Room(rname)
rooms.append(room)
room.admit(addr)
def help(self, data, addr, sock):
helpmessage = '''WesChat help menu:
/uname [username]: Change your username
/join [room]: Join a chatroom
/help: Display this help
/room: Display the current room name
'''
sock.send(helpmessage.encode("UTF-8"))
def room(self, data, addr, sock):
room = lookupUser(addr)
if room is None:
room = "Error looking up room"
room = "You are in the room "+room.name+"\n"
sock.send(room.encode("UTF-8"))
def command(self, data, addr, sock):
for command in self.COMMANDS.keys():
if data.startswith(command):
self.COMMANDS[command](data, addr, sock)
commander = Commander()
##
WAITING = []
HANDSHAKE = "Ni"
try:
while True:
for room in rooms:
room.autoExpel()
read_sockets = select.select(CONNECTIONS+WAITING, [], [], 0)[0]
for sock in read_sockets:
if sock == server_sock:
sfd, addr = server_sock.accept()
#CONNECTIONS.append(sfd)
WAITING.append(sfd)
#hall.admit(addr)
print("Client "+name(addr)+" connected, awaiting handshake")
#hall.recv("<server> Client "+name(addr)+" connected")
else:
try:
data = sock.recv(4096)
addr = sock.getpeername()
if sock in WAITING:
if data.decode() == HANDSHAKE:
print(name(addr)+" handshaked")
WAITING.remove(sock)
hall.admit(addr)
hall.recv("Client "+name(addr)+" connected")
CONNECTIONS.append(sock)
else:
#print("Received "+data.decode()+" not "+HANDSHAKE)
WAITING.remove(sock)
continue
if data:
data = data.decode()
if data.startswith("/"):
commander.command(data, addr, sock)
else:
msg = "<"+name(addr)+"> "+data
#print(msg)
userRoom = lookupUser(addr)
userRoom.recv(msg)
#print(hall.users)
#print(lookupUser(addr))
#print(addr in hall.users)
#hall.recv(msg)
except Exception as e:
print(e)
print("Client "+name(addr)+" disconnected")
try: # sometimes closing/removing will fail
sock.close()
CONNECTIONS.remove(sock)
hall.recv("<server> Client "+name(addr)+" disconnected")
try:
del UNAMES[addr]
except KeyError:
pass
continue
except:
continue
finally:
server_sock.close()