simple echo websocket server implement in python

websocket-server.py

import socket,select,time,re,base64,hashlib
def debug(b):
	print("txt:")
	print(b)
	# print(b.decode('UTF-8'),end='')
	print("ENDtxt")
def getAll(cs):
	ret = bytes()
	while len(select.select([cs],[],[],0)[0]):
		recv=cs.recv(10)
		if not recv:return None
		ret+=recv
	return ret
def unmask(data):
	size=data[1]&(0b1111111)
	offset=2
	if size<=125:offset+=0
	elif size==126:
		offset+=2
		size=int.from_bytes(data[2:4],byteorder='big')
	else:
		offset+=8
		size=int.from_bytes(data[2:10],byteorder='big')
	print("size=%d"%size)
	mask=data[offset:offset+4]
	print("mask:%r"%mask)
	offset+=4
	print("data:%r"%data[offset:])
	ret=bytes()
	for i in range(size):
		xor=data[i+offset]^mask[i%4]
		ret+=xor.to_bytes(1,byteorder='big')
	print(ret)
	if offset+size < len(data):
		unmask(data[offset+size:])
host = ''
port = 8080
size = 1024
s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(1)
s.setblocking(0)
while len(select.select([s],[],[],0)[0])==0:
	time.sleep(1)
	print("LOOP")
client, address = s.accept()
client.setblocking(0)
print("Incoming connection from ",address)
data = getAll(client)
debug(data)
wskey=re.search(r'^Sec-WebSocket-Key\s*:\s*(.+?)\r?$',data.decode('UTF-8'),re.M).group(1)
GUID="258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
print("wskey=[%r]"%wskey)
ret="""HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: %s

"""%base64.b64encode(hashlib.sha1((wskey+GUID).encode()).digest()).decode('UTF-8')
ret=ret.encode()
debug(ret)
client.send(ret)
while True:
	data=getAll(client)
	if data is None:break
	if data:
		unmask(data)
		client.send(data)
	time.sleep(1)
	print("LOOP")