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Old 08-06-2020, 06:37 AM   #1
cmgeo
Member
 
Registered: Oct 2011
Location: India
Distribution: Win 7, Debian Stretch, ubuntoooo
Posts: 54

Rep: Reputation: Disabled
how to end looping socket server (python script)


hello,

this is my partial server script:
Code:
def proceessConnection(conn, addr):
	global __continueProgamme
	with conn:
		#print('Connected by', addr)
		while True and __continueProgamme == 1:
			data = conn.recv(64)
			print(type(data), data)
			if not data:
				break
			
			if data == b'EXIT':
				#print('settng to exit')
				__continueProgamme = 0
				exit(0)
				break
			elif len(data.decode('utf-8').split(".")) == 4:
				conn.sendall(bytearray(whichCountry((data.decode('utf-8'))),'utf-8'))
			else:
				conn.sendall(data)
		#print("Ending connection",addr)

def getSocket():
	try:
		s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		print(type(s), s)
		s.bind(('127.0.0.1', 50000))
		return s
	except Exception as e:
		#print("Waiting for socket")
		time.sleep(1)
		return getSocket()

s=getSocket()


__continueProgamme = 1

while True:
	#print("Ready to Accept")
	if __continueProgamme != 1:
		break
	
	s.listen()
	conn, addr = s.accept()
	childT = threading.Thread(target=proceessConnection, args=(conn, addr))
	childT.start()
	#print('finished threading start')
	if __continueProgamme != 1:
		break
	#print("not set to exit")
and this is my client script
Code:
def sendToServer(msg):
	s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	s.connect(("127.0.0.1", 50000))
	s.sendall(msg)
	data = s.recv(1024)
	print(type(data), data)
	print('Received', repr(data))


sendToServer(b'Hello, world')
sendToServer(b'31.13.127.8')
sendToServer(b'EXIT')
sendToServer(b'EXIT')
my problem is that i wish to stop the server on first exit but it does not and only does so on second attempt where it returns exception ConnectionResetError.

i want to smoothly exit the server on first exit.

how do i achieve that.

Thanks for looking into it.

CMG
 
Old 08-06-2020, 07:35 AM   #2
SoftSprocket
Member
 
Registered: Nov 2014
Posts: 324

Rep: Reputation: Disabled
When the thread exits that is processing the first connection the server is blocked in the accept call. When the second connection occurs a new thread is created but the server then sees that the loop variable is now false and exits - breaking the second connection.

If you want to wait for a thread to exit before blocking on an accept call (i.e. only accept one connection at a time) you can use thread.join. If you don't want to block on accept you can set the serve socket non-blocking and then use the select module.
 
1 members found this post helpful.
Old 08-06-2020, 08:28 AM   #3
cmgeo
Member
 
Registered: Oct 2011
Location: India
Distribution: Win 7, Debian Stretch, ubuntoooo
Posts: 54

Original Poster
Rep: Reputation: Disabled
Thank you, it solves my problem.

CMG
 
  


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