Question

我用python写一个服务器，它可以工作。它可以向客户端发送数据或从客户端接收数据。每当我更改此代码语法并想要执行它时，我都会更改端口号（将1加上前一个数字）。更改端口号4到5次后，客户端无法连接到服务器，并且会收到TCP连接超时错误，尽管该端口可从服务器使用。我使用大力神作为客户。问题实际上并不取决于我更改端口号的时间。如果服务器等待或用一点时间来监听（我不知道那是多少时间），我也有同样的问题，即使更改端口号，客户端也无法连接到服务器。而客户端显示TCP连接超时错误服务器在终端中显示此错误：

urllib3.connectionpool - DEBUG - https://api.mycroft.ai:443 "GET 
/v1/device/0bcdba9f-4a90-4fdf-977a-61eb54afea9c/skill HTTP/1.1" 304 0

这是我使用的服务器代码：

class server(object):
def __init__(self, host, port):
    self.host = get_ip.get_ip_address('wlan0')  #'192.168.1.102'
    self.port = 1924
    self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    self.sock.bind((self.host, self.port))

def listen(self,after_idle_sec, interval_sec, max_fails):
    m = self.sock.getsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE)
    if(m ==0):
        print("SOCKET KEEPALIVE OFF, TURNING ON")
        self.set_keepalive_osx(after_idle_sec, interval_sec, max_fails)
        print("interval_sec:", interval_sec)
        print("after_idle_sec:", after_idle_sec)
        print("max_fails:", max_fails)
    else:
        print("SOCKET KEEPALIVE IS ALREADY ON")
    self.sock.listen(5)

    print('WAITING FOR A CONNECTION')

    while True:
        client, address = self.sock.accept()

        #client.settimeout(60)
        Thread(target = self.client_thread, args = (client,address)).start()

def set_keepalive_osx(self, after_idle_sec=1, interval_sec=3, max_fails=5):
    """Set TCP keepalive on an open socket.

    sends a keepalive ping once every 3 seconds (interval_sec)
    """
    # scraped from /usr/include, not exported by python's socket module
    TCP_KEEPALIVE = 0x10
    self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
    self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, after_idle_sec)
    self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, interval_sec)
    self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, max_fails)  

def shutdown(self):   #terminate server
    self.sock.shutdown(socket.SHUT_RDWR)  #further sends and receives are disallowed
    self.sock.close()
    print ("closed")

def client_thread（自己，客户，地址）：

    while True:
        size = 1024
        try:
            self.servermsg = client.recv(size)  
            print("data received from client is: {}".format(self.servermsg))

            if self.servermsg:
                # Set the response to echo back the recieved data
                response = self.servermsg  
                #do something

             else:       
                #raise error('Client disconnected')
                raise Exception('Client disconnected')

        except Exception as e:
            print(repr(e))
            client.close()
            return False

这不完全是我的代码，我删除了一些方法。我认为它可能与setttimeout(60)有关，但是在我发表评论后，我遇到了同样的问题。我应该重新启动系统，每次重新启动后我都会遇到此问题。添加“ set_keepalive_osx”方法后，出现此错误：

 in set_keepalive_osx
self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, after_idle_sec)
AttributeError: module 'socket' has no attribute 'TCP_KEEPIDLE'

我更改listen方法并在其中调用'set_keepalive_osx'方法。之后，我没有上面的错误，但我不知道它是否起作用。如果我几分钟不使用它，它不会发送超时错误，并且当客户端断开连接时也会出现此错误：

ConnectionResetError(104, 'Connection reset by peer')

而不是引发一个client disconnected异常。有人可以告诉我问题出在哪里吗？

某些连接后客户端无法连接到服务器（python）

0 个答案: