import socket
import threading
 
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 
sock.bind(('localhost', 5550))
 
sock.listen(5)
print('Server', socket.gethostbyname('localhost'), 'listening ...')
 
mydict = dict()
mylist = list()
 
def tellOthers(exceptNum, whatToSay):
    for c in mylist:
        if c.fileno() != exceptNum :
            try:
                c.send(whatToSay.encode())
            except:
                pass
 
def subThreadIn(myconnection, connNumber):
    #nickname = myconnection.recv(1024).decode()
    #mydict[myconnection.fileno()] = nickname
    mylist.append(myconnection)
    #print('connection', connNumber, ' has nickname :', nickname)
    #tellOthers(connNumber, '【系統提示：'+mydict[connNumber]+' 進入】')
    while True:
        try:
            recvedMsg = myconnection.recv(1024).decode()
            if recvedMsg:
                print(recvedMsg)
                #tellOthers(connNumber, mydict[connNumber]+' :'+recvedMsg)
                sock.send('quit'.encode())
        except (OSError, ConnectionResetError):
            try:
                mylist.remove(myconnection)
            except:
                pass
            print('Client left')
            #tellOthers(connNumber, '【系統提示：'+mydict[connNumber]+' 離開】')
            myconnection.close()
            return
 
while True:
    connection, addr = sock.accept()
    print('Accept a new connection', connection.getsockname(), connection.fileno())
    try:
        #connection.settimeout(5)
        buf = connection.recv(1024).decode()
        if buf:
            connection.send(b'welcome to server!')
 
            #為當前連結開啟一個新的執行緒
            mythread = threading.Thread(target=subThreadIn, args=(connection, connection.fileno()))
            mythread.setDaemon(True)
            mythread.start()
 
        else:
            connection.send(b'please go out!')
            connection.close()
    except :  
        pass

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