def connect_to_chat(self, name):
connect_chat_request = MessageMapper.pack_connect_request(
name, LISTENER_SOCKET_HOST,
self.listener_socket.getsockname()[1])
try:
self.send(self.socket, connect_chat_request)
connection_response: bytes = self.socket.recv(
MAX_MESSAGE_SIZE_RECV)
status: int = MessageMapper.unpack_status(connection_response[8:9])
if status == Status.OK.value:
global my_name
my_name = name.lower()
return (True, '')
else:
message = connection_response[9:]
error_message = MessageMapper.unpack_error_response(message)
return (False, error_message)
except (ConnectionAbortedError, ConnectionResetError) as error:
error_message = 'Connection reset.\nOS error: {0}'.format(error)
self.disconnect_from_user(name)
return (False, error_message)
except OSError as error:
error_message = 'Failed to send message to server. Try again.\nOS error: {0}'.format(
error)
return (False, error_message)
def handle_validate_message(self, client_sock, message):
status = MessageMapper.unpack_status(message)
if status != Status.OK.value:
self.close_connection(client_sock)
else:
print('User still active')
def get_user_list(self):
get_list_request = MessageMapper.pack_get_list_request()
try:
self.send(self.socket, get_list_request)
get_list_response = self.socket.recv(MAX_MESSAGE_SIZE_RECV)
user_list = MessageMapper.unpack_get_list_response(
get_list_response[9:])
return (True, user_list, None)
except (ConnectionResetError, ConnectionAbortedError):
error_message = 'Server disconnected'
self.disconnect_from_chat()
return (False, None, error_message)
except OSError as error:
message = 'OS error: {0}'.format(error) + ', try again'
return (False, None, message)
def handle_validation(self, socket):
response = MessageMapper.pack_ok_response(
Method.VALIDATE_CONNECTION.value)
try:
self.send(socket, response)
except OSError:
raise
def validate_connection(self, name):
validation: bytes = MessageMapper.pack_validate_user_message()
socket = connections_lister.get_connection_by_name(name)
if socket:
try:
socket.sendall(validation)
except OSError:
self.close_connection(socket)
def connect_with_user(self, name):
if name == my_name:
error_message = 'You can\'t connect to yourself, try another user :)'
return (False, error_message, None)
else:
if peers_lister.exists_in_peers(name):
error_message = 'You are already connected to ' + name + ', try another user :)'
return (False, error_message, None)
get_user_request = MessageMapper.pack_get_user_request(name)
try:
self.send(self.socket, get_user_request)
get_user_response = self.socket.recv(MAX_MESSAGE_SIZE_RECV)
status = MessageMapper.unpack_status(get_user_response[8:9])
message = get_user_response[9:]
if status == Status.OK.value:
user: User = MessageMapper.unpack_get_user_response(message)
new_socket = sock.socket()
success, message = self.connect(new_socket, user)
if not success:
return (success, message, None)
connections_lister.add_connection(user.name, new_socket)
peers_lister.add_to_peers(user.name)
return (True, None, new_socket)
else:
error_message = MessageMapper.unpack_error_response(message)
return (False, error_message, None)
except (ConnectionResetError, ConnectionAbortedError):
error_message = 'Server disconnected'
self.disconnect_from_chat()
return (False, error_message, None)
except OSError as error:
error_message = 'Failed to send message\nOS error: {0}'.format(
error) + '\nIf the error persists, consider disconnecting'
return (False, error_message, None)
def accept_connection(self, socket):
try:
(client_socket, address) = socket.accept()
message = client_socket.recv(MAX_MESSAGE_SIZE_RECV)
user_name = MessageMapper.unpack_user_id_on_connect_message(
message[8:])
return (client_socket, address, user_name)
except OSError:
raise
def serve(self, client_sock, address):
while True:
try:
request = client_sock.recv(MAX_MESSAGE_SIZE_RECV)
if not request:
self.close_connection(client_sock, address)
return
method = MessageMapper.unpack_method(request)
message = request[8:]
if method == Method.ENTER_CHAT.value:
user: User = MessageMapper.unpack_connect_request(message)
self.handle_connection_request(client_sock, user)
elif method == Method.GET_USER.value:
user_name: str = MessageMapper.unpack_get_user_request(
message)
self.handle_get_user_request(client_sock, user_name)
elif method == Method.CHECK_USER_CONNECTION.value:
user_name: str = MessageMapper.unpack_check_user_request(
message)
self.handle_check_request(user_name)
elif method == Method.LIST_USERS.value:
self.handle_get_list_request(client_sock)
elif method == Method.VALIDATE_CONNECTION.value:
self.handle_validate_message(client_sock, message)
except (ConnectionAbortedError, ConnectionResetError):
self.close_connection(client_sock, address)
except OSError as error:
print('OS error: {0}'.format(error))
def handle_server_message(self):
try:
message = self.socket.recv(MAX_MESSAGE_SIZE_RECV)
method = MessageMapper.unpack_method(message)
if method == Method.VALIDATE_CONNECTION.value:
self.handle_validation(self.socket)
return (True, None)
except (ConnectionResetError, ConnectionAbortedError):
error_message = 'Server disconnected'
self.disconnect_from_chat()
return (False, error_message)
except OSError as error:
message = 'OS error: {0}'.format(error) + ', try again'
return (False, message)
def receive(self, client_sock):
try:
message = client_sock.recv(MAX_MESSAGE_SIZE_RECV)
if not message:
name = connections_lister.pop_connection_by_socket(
client_sock)[0]
if name:
peers_lister.remove_from_peers(name)
message = name + ' disconnected'
return (False, message, None, client_sock)
(user, msg) = MessageMapper.unpack_message_receive(message)
return (True, msg, user, None)
except (ConnectionAbortedError, ConnectionResetError) as error:
error_message = 'Connection reset.\nOS error: {0}'.format(error)
name = connections_lister.pop_connection_by_socket(client_sock)[0]
if name:
peers_lister.remove_from_peers(name)
message = error_message + '\n' + name + ' disconnected'
return (False, message, None, client_sock)
def connect(self, socket, user: User):
try:
socket.connect((user.ip_address, user.port))
except OSError as error:
error_message = 'Failed to connect to ' + user.name + '\nOS error: {0}'.format(
error)
self.disconnect_from_user(user.name)
self.check_user(user.name)
return (False, error_message)
id_msg = MessageMapper.pack_user_id_on_connect_message(my_name)
try:
self.send(socket, id_msg)
return (True, None)
except OSError as error:
error_message = 'Failed to connect to ' + user.name + '\nOS error: {0}'.format(
error)
self.disconnect_from_user(user.name)
self.check_user(user.name)
return (False, error_message)
def send_input_message_to_user(self, name, user_input):
if name == my_name:
error_message = 'You can\'t send a message to yourself, try someone else in the chat :)'
return (False, error_message)
else:
if not peers_lister.exists_in_peers(name):
error_message = 'You are not connected to' + name + '\nYou can\'t send a message to a user you are not connected to.'
return (False, error_message)
message = MessageMapper.pack_message_send(my_name, user_input)
client_socket = connections_lister.get_connection_by_name(name)
try:
self.send(client_socket, message)
return (True, '')
except OSError as error:
error_message = 'Failed to send message to ' + name + '\nOS error: {0}'.format(
error
) + '\nIf the error persists, consider disconnecting from user'
self.check_user(name)
return (False, error_message)
def check_user(self, name):
check_user_request = MessageMapper.pack_check_user_request(name)
self.send(self.socket, check_user_request)
def send_list_response(self, client_sock, simplified_list):
message = MessageMapper.pack_get_list_response(simplified_list)
client_sock.sendall(message)
def send_get_user_response(self, client_sock, user, request_type):
user_response = MessageMapper.pack_get_user_response(
user.name, user.ip_address, user.port)
client_sock.sendall(user_response)
def send_ok_response(self, client_sock, request_type):
ok_response = MessageMapper.pack_ok_response(request_type)
client_sock.sendall(ok_response)
def send_error_response(self, client_sock, request_type, error_message):
error_response = MessageMapper.pack_error_response(
request_type, error_message)
client_sock.sendall(error_response)
