class Server(threading.Thread, metaclass=ServerMaker):
port = Port()
def __init__(self, listen_address, listen_port, database):
# Параментры подключения
self.addr = listen_address
self.port = listen_port
# База данных сервера
self.database = database
# Список подключённых клиентов.
self.clients = []
# Список сообщений на отправку.
self.messages = []
# Словарь содержащий сопоставленные имена и соответствующие им сокеты.
self.names = dict()
# Конструктор предка
super().__init__()
def init_socket(self):
logger.info(
f'Запущен сервер, порт для подключений: {self.port} , адрес с которого принимаются подключения: {self.addr}. Если адрес не указан, принимаются соединения с любых адресов.'
)
# Готовим сокет
transport = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
transport.bind((self.addr, self.port))
transport.settimeout(0.5)
# Начинаем слушать сокет.
self.sock = transport
self.sock.listen()
def run(self):
# Инициализация Сокета
self.init_socket()
# Основной цикл программы сервера
while True:
# Ждём подключения, если таймаут вышел, ловим исключение.
try:
client, client_address = self.sock.accept()
except OSError:
pass
else:
logger.info(f'Установлено соедение с ПК {client_address}')
self.clients.append(client)
recv_data_lst = []
send_data_lst = []
err_lst = []
# Проверяем на наличие ждущих клиентов
try:
if self.clients:
recv_data_lst, send_data_lst, err_lst = select.select(
self.clients, self.clients, [], 0)
except OSError as err:
logger.error(f'Ошибка работы с сокетами: {err}')
# принимаем сообщения и если ошибка, исключаем клиента.
if recv_data_lst:
for client_with_message in recv_data_lst:
try:
self.process_client_message(
get_message(client_with_message),
client_with_message)
except (OSError):
# Ищем клиента в словаре клиентов и удаляем его из него
# и базы подключённых
logger.info(
f'Клиент {client_with_message.getpeername()} отключился от сервера.'
)
for name in self.names:
if self.names[name] == client_with_message:
self.database.user_logout(name)
del self.names[name]
break
self.clients.remove(client_with_message)
# Если есть сообщения, обрабатываем каждое.
for message in self.messages:
try:
self.process_message(message, send_data_lst)
except (ConnectionAbortedError, ConnectionError,
ConnectionResetError, ConnectionRefusedError):
logger.info(
f'Связь с клиентом с именем {message[DESTINATION]} была потеряна'
)
self.clients.remove(self.names[message[DESTINATION]])
self.database.user_logout(message[DESTINATION])
del self.names[message[DESTINATION]]
self.messages.clear()
# Функция адресной отправки сообщения определённому клиенту. Принимает словарь сообщение, список зарегистрированых
# пользователей и слушающие сокеты. Ничего не возвращает.
def process_message(self, message, listen_socks):
if message[DESTINATION] in self.names and self.names[
message[DESTINATION]] in listen_socks:
send_message(self.names[message[DESTINATION]], message)
logger.info(
f'Отправлено сообщение пользователю {message[DESTINATION]} от пользователя {message[SENDER]}.'
)
elif message[DESTINATION] in self.names and self.names[
message[DESTINATION]] not in listen_socks:
raise ConnectionError
else:
logger.error(
f'Пользователь {message[DESTINATION]} не зарегистрирован на сервере, отправка сообщения невозможна.'
)
# Обработчик сообщений от клиентов, принимает словарь - сообщение от клиента, проверяет корректность, отправляет
# словарь-ответ в случае необходимости.
def process_client_message(self, message, client):
global new_connection
logger.debug(f'Разбор сообщения от клиента : {message}')
# Если это сообщение о присутствии, принимаем и отвечаем
if ACTION in message and message[
ACTION] == PRESENCE and TIME in message and USER in message:
# Если такой пользователь ещё не зарегистрирован, регистрируем,
# иначе отправляем ответ и завершаем соединение.
if message[USER][ACCOUNT_NAME] not in self.names.keys():
self.names[message[USER][ACCOUNT_NAME]] = client
client_ip, client_port = client.getpeername()
self.database.user_login(message[USER][ACCOUNT_NAME],
client_ip, client_port)
send_message(client, RESPONSE_200)
with conflag_lock:
new_connection = True
else:
response = RESPONSE_400
response[ERROR] = 'Имя пользователя уже занято.'
send_message(client, response)
self.clients.remove(client)
client.close()
return
# Если это сообщение, то добавляем его в очередь сообщений. Ответ не
# требуется.
elif ACTION in message and message[ACTION] == MESSAGE and DESTINATION in message and TIME in message \
and SENDER in message and MESSAGE_TEXT in message and self.names[message[SENDER]] == client:
self.messages.append(message)
self.database.process_message(message[SENDER],
message[DESTINATION])
return
# Если клиент выходит
elif ACTION in message and message[ACTION] == EXIT and ACCOUNT_NAME in message \
and self.names[message[ACCOUNT_NAME]] == client:
self.database.user_logout(message[ACCOUNT_NAME])
logger.info(
f'Клиент {message[ACCOUNT_NAME]} корректно отключился от сервера.'
)
self.clients.remove(self.names[message[ACCOUNT_NAME]])
self.names[message[ACCOUNT_NAME]].close()
del self.names[message[ACCOUNT_NAME]]
with conflag_lock:
new_connection = True
return
# Если это запрос контакт-листа
elif ACTION in message and message[ACTION] == GET_CONTACTS and USER in message and \
self.names[message[USER]] == client:
response = RESPONSE_202
response[LIST_INFO] = self.database.get_contacts(message[USER])
send_message(client, response)
# Если это добавление контакта
elif ACTION in message and message[ACTION] == ADD_CONTACT and ACCOUNT_NAME in message and USER in message \
and self.names[message[USER]] == client:
self.database.add_contact(message[USER], message[ACCOUNT_NAME])
send_message(client, RESPONSE_200)
# Если это удаление контакта
elif ACTION in message and message[ACTION] == REMOVE_CONTACT and ACCOUNT_NAME in message and USER in message \
and self.names[message[USER]] == client:
self.database.remove_contact(message[USER], message[ACCOUNT_NAME])
send_message(client, RESPONSE_200)
# Если это запрос известных пользователей
elif ACTION in message and message[ACTION] == USERS_REQUEST and ACCOUNT_NAME in message \
and self.names[message[ACCOUNT_NAME]] == client:
response = RESPONSE_202
response[LIST_INFO] = [
user[0] for user in self.database.users_list()
]
send_message(client, response)
# Иначе отдаём Bad request
else:
response = RESPONSE_400
response[ERROR] = 'Запрос некорректен.'
send_message(client, response)
return
class Server(threading.Thread, metaclass=ServerMaker):
port = Port()
def __init__(self, listen_address, listen_port, database):
self.addr = listen_address
self.port = listen_port
self.database = database
self.clients = []
self.messages = []
self.names = dict()
super().__init__()
def init_socket(self):
logger.info(f'Server is ready, port to conenct: {self.port} , '
f'connection from address: {self.addr}. '
f'If not set, allowed connections from all port.')
transport = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
transport.bind((self.addr, self.port))
transport.settimeout(0.5)
self.sock = transport
self.sock.listen()
def run(self):
global new_connection
self.init_socket()
while True:
try:
client, client_address = self.sock.accept()
except OSError:
pass
else:
logger.info(f'Connection with PC {client_address}')
self.clients.append(client)
recv_data_lst = []
send_data_lst = []
err_lst = []
try:
if self.clients:
recv_data_lst, send_data_lst, err_lst = select.select(
self.clients, self.clients, [], 0)
except OSError as err:
logger.error(f'socket process error: {err}')
if recv_data_lst:
for client_with_message in recv_data_lst:
try:
self.process_client_message(
get_message(client_with_message),
client_with_message)
except (OSError):
logger.info(
f'Client {client_with_message.getpeername()} '
f'disconnected from server.')
for name in self.names:
if self.names[name] == client_with_message:
self.database.user_logout(name)
del self.names[name]
break
self.clients.remove(client_with_message)
with conflag_lock:
new_connection = True
for message in self.messages:
try:
self.process_message(message, send_data_lst)
except (ConnectionAbortedError, ConnectionError,
ConnectionResetError, ConnectionRefusedError):
logger.info(f'Connection with {message[DESTINATION]} lsot')
self.clients.remove(self.names[message[DESTINATION]])
self.database.user_logout(message[DESTINATION])
del self.names[message[DESTINATION]]
with conflag_lock:
new_connection = True
self.messages.clear()
def process_message(self, message, listen_socks):
if message[DESTINATION] in self.names and self.names[
message[DESTINATION]] in listen_socks:
send_message(self.names[message[DESTINATION]], message)
logger.info(
f'Message to user {message[DESTINATION]} by user {message[SENDER]}.'
)
elif message[DESTINATION] in self.names and self.names[
message[DESTINATION]] not in listen_socks:
raise ConnectionError
else:
logger.error(f'User {message[DESTINATION]} is incorrect,'
f' could not sent message)')
def process_client_message(self, message, client):
global new_connection
logger.debug(f'Parsing user message: {message}')
if ACTION in message and message[
ACTION] == PRESENCE and TIME in message and USER in message:
if message[USER][ACCOUNT_NAME] not in self.names.keys():
self.names[message[USER][ACCOUNT_NAME]] = client
client_ip, client_port = client.getpeername()
self.database.user_login(message[USER][ACCOUNT_NAME],
client_ip, client_port)
send_message(client, RESPONSE_200)
with conflag_lock:
new_connection = True
else:
response = RESPONSE_400
response[ERROR] = 'User name is alredy exists.'
send_message(client, response)
self.clients.remove(client)
client.close()
return
elif ACTION in message and message[ACTION] == MESSAGE and DESTINATION in message and TIME in message \
and SENDER in message and MESSAGE_TEXT in message and self.names[message[SENDER]] == client:
if message[DESTINATION] in self.names:
self.messages.append(message)
self.database.process_message(message[SENDER],
message[DESTINATION])
send_message(client, RESPONSE_200)
else:
response = RESPONSE_400
response[ERROR] = 'User not registered on server.'
send_message(client, response)
return
elif ACTION in message and message[ACTION] == EXIT and ACCOUNT_NAME in message \
and self.names[message[ACCOUNT_NAME]] == client:
self.database.user_logout(message[ACCOUNT_NAME])
logger.info(f'user {message[ACCOUNT_NAME]} succesfully logout.')
self.clients.remove(self.names[message[ACCOUNT_NAME]])
self.names[message[ACCOUNT_NAME]].close()
del self.names[message[ACCOUNT_NAME]]
with conflag_lock:
new_connection = True
return
elif ACTION in message and message[ACTION] == GET_CONTACTS and USER in message and \
self.names[message[USER]] == client:
response = RESPONSE_202
response[LIST_INFO] = self.database.get_contacts(message[USER])
send_message(client, response)
elif ACTION in message and message[ACTION] == ADD_CONTACT and ACCOUNT_NAME in message and USER in message \
and self.names[message[USER]] == client:
self.database.add_contact(message[USER], message[ACCOUNT_NAME])
send_message(client, RESPONSE_200)
elif ACTION in message and message[ACTION] == REMOVE_CONTACT and ACCOUNT_NAME in message and USER in message \
and self.names[message[USER]] == client:
self.database.remove_contact(message[USER], message[ACCOUNT_NAME])
send_message(client, RESPONSE_200)
elif ACTION in message and message[ACTION] == USERS_REQUEST and ACCOUNT_NAME in message \
and self.names[message[ACCOUNT_NAME]] == client:
response = RESPONSE_202
response[LIST_INFO] = [
user[0] for user in self.database.users_list()
]
send_message(client, response)
else:
response = RESPONSE_400
response[ERROR] = 'Request is incorrect.'
send_message(client, response)
return