Python:通过套接字发送的消息大小

Question

我正在尝试使用 socket 库发送消息。由于消息的大小可变，我决定在字符串的开头附加消息的大小，然后发送它。例如，如果消息是

Hello World!

长度为 13 个字符(我已经计算过 EOL)，我会发送类似的内容

sizeof13charsinbytes|Hello World!

通过 socket.send()，然后我将使用 str.split()

拆分大小和消息

由于 socket.recv() 需要以字节为单位的消息大小，如何找到消息的大小？我尝试了 sys.getsizeof() 但它为单字符字符串提供了任意值。尺寸合适吗？

Answer 1

重新发明轮子没有意义。通过使用 multiprocessing.connection 模块将字符串作为 python 字符串对象发送，可以轻松发送可变长度字符串。此方法将允许发送大多数 python 对象，而不仅仅是字符串。

import multiprocessing
import multiprocessing.connection as connection

def producer(data, address, authkey):
    with connection.Listener(address, authkey=authkey) as listener:
        with listener.accept() as conn:
            print('connection accepted from', listener.last_accepted)
            for item in data:
                print("producer sending:", repr(item))
                conn.send(item)


def consumer(address, authkey):
    with connection.Client(address, authkey=authkey) as conn:
        try:
            while True:
                item = conn.recv()
                print("consumer received:", repr(item))
        except EOFError:
            pass

listen_address = "localhost", 50000
remote_address = "localhost", 50000
authkey = b'secret password'

if __name__ == "__main__":
    data = ["1", "23", "456"]
    p = multiprocessing.Process(target=producer, args=(data, listen_address, authkey))
    p.start()
    consumer(remote_address, authkey)
    p.join()
    print("done")

产生类似的东西:

producer sending: '1'
producer sending: '23'
consumer received: '1'
producer sending: '456'
consumer received: '23'
consumer received: '456'
done