python-如何检测客户端何时与UDS断开连接(Unix域套接字)

当客户端连接到管道并发送数据时,我可以收到罚款,并且可以继续接收数据.当客户端断开连接并且while循环仍处于活动状态时,麻烦就来了,connection.recv()不会阻塞,因此会不断循环！因此,我需要一种方法来检测客户端是否仍处于连接状态.

我有以下代码：

    pipe = './pipes/uds_defzone-lrecv'

    try:
        os.unlink(pipe)
    except OSError:
        if os.path.exists(pipe):
            raise
    self.logger.debug('Created UDS pipe: ' + pipe)

    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    sock.bind(pipe)
    sock.listen(1)

    self.logger.debug('Waiting for connection: ' + pipe)
    connection, client_address = sock.accept()
    self.logger.debug('Connection from: ' + client_address)

    while True:

        self.logger.debug('Waiting for data')
        data = connection.recv(4096)
        self.logger.debug('Received: ' + str(data))

供参考,sender.py代码：

# Create a UDS socket
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

# Connect the socket to the port where the server is listening
pipe = './pipes/uds_defzone-lrecv'

logger.debug('connecting to: ' + pipe)

try:
    sock.connect(pipe)
except socket.error, msg:
    logger.debug(msg)
    sys.exit(1)

try:
    message = 'THIS IS A TEST'
    logger.debug('sending: ' + message)
    sock.sendall(message)
    time.sleep(2)

finally:
    logger.debug('closing socket')
    sock.close()

TIA！

更新

我可以使用下面的代码来减慢速度,但不完全是我想要的.

    while True:

        try:
            self.logger.debug('Waiting for data')
            data_present = select.select([sock], [], [], 30)
            if data_present[0]:
                data = connection.recv(4096)
                self.logger.debug('Received: ' + data)
        except select.timeout:
            pass

更新2

作为参考,这是我想出的代码：

        while True:

            logger.debug('Waiting for data')
            data = connection.recv(4096)
            if not data == '':
                logger.debug('Received: ' + data)
            else:
                logger.debug('Nothing received')
                break

我在此过程中遇到的黑客…在客户端可以发送空数据以表示信号的合法情况下,可以使用吗？

        while True:

            try:
                logger.debug('Waiting for data')
                data = connection.recv(4096)
                # *** This throws an exception when client has disconnected
                x = connection.getpeername()
                logger.debug('Received: ' + data)
            except:
                logger.debug('Client disconnected')
                break

解决方法:

connection.recv() doesn’t block and therefore keeps looping frantically! So I need a way to detect if a client is still connected.

如果对等方断开连接,则recv数据将返回空数据(”).您需要检查并退出循环.

标签：sockets,unix-socket,python
来源： https://codeday.me/bug/20191120/2047124.html