import socket
HOST = '127.0.0.1'
PORT = 65432
class ServerApp:
def __init__(self):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.bind((HOST, PORT))
self.socket.listen(1)
def mainloop(self):
# Какой-то код здесь
pass
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.socket.shutdown(socket.SHUT_RDWR)
self.socket.close()
if __name__ == '__main__':
with ServerApp() as app:
while True:
app.mainloop()self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
Running an example several times with too small delay between executions, could lead to this error:
OSError: [Errno 98] Address already in use
This is because the previous execution has left the socket in a TIME_WAIT state, and can’t be immediately reused.
There is a socket flag to set, in order to prevent this, socket.SO_REUSEADDR:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((HOST, PORT))
the SO_REUSEADDR flag tells the kernel to reuse a local socket in TIME_WAIT state, without waiting for its natural timeout to expire.
try:
s.connect((TCP_IP, TCP_PORT))
s.sendall(MESSAGE)
data = s.recv(BUFFER_SIZE)
except socket.error:
#код обработки ошибки
finally:
s.close()