Python 如何检测服务器关闭unix域套接字？

我正在摆弄python twisted库，我似乎不知道如何让我的客户机检测到服务器关闭其套接字。我的客户端继续让我向不存在的服务器发送数据。这是我的服务器：

test_server.py 它所做的只是将收到的每一行发送回连接的客户端。 以下是客户：

test_client.py 如果我先运行服务器，然后运行客户机，然后杀死服务器，客户机仍然会写入

CommandProtocol

的传输，就像什么都没发生一样。我认为

errback

函数至少会报告一些东西。在客户机在服务器之前运行的情况下，会使用ConnectError调用

errback

函数，但我特别希望检测客户机已经连接到服务器并且服务器退出的情况

---

如何检测服务器已关闭？

我想os.stat方法和stat模块可以帮助您。您能否将客户端代码更改为如下所示：

import os
import stat
from twisted.internet import protocol, reactor, endpoints, stdio
from twisted.protocols.basic import LineReceiver


class CommandProtocol(protocol.Protocol):
    def dataReceived(self, data):
        print data,


class StdinProtocol(LineReceiver):
    from os import linesep as delimiter

    def __init__(self, client):
        self._client = client

    def connectionMade(self):
        self.transport.write('>>> ')

    def lineReceived(self, line):
        print 'writing line: %s' % line
        self._client.transport.write(line + os.linesep)


def printError(failure):
    print str(failure)


def main():
    if os.stat('./test.sock').st_mode & (stat.S_IRGRP | stat.S_IRUSR | stat.S_IROTH):
        print "1"
        print "using control socket"
        point = endpoints.UNIXClientEndpoint(reactor, './test.sock')

        proto = CommandProtocol()
        d = endpoints.connectProtocol(point, proto)
        d.addErrback(printError)

        stdio.StandardIO(StdinProtocol(proto))
        reactor.run()
    else:
        print "not ready"


main()

---

ITransport.write

在已断开连接的传输上调用时，是无声的no-op

---

如果要了解连接已丢失，请重写

connectionLost

方法。一旦知道连接已断开，您可以安排程序停止接受输入或对接收到的输入执行其他操作。

这将处理客户端在服务器之前启动的情况，但在客户端已连接后服务器关闭的情况下，这没有帮助。我编辑了我的问题以澄清这一点。

import os
from twisted.internet import protocol, reactor, endpoints, stdio
from twisted.protocols.basic import LineReceiver


class CommandProtocol(protocol.Protocol):
    def dataReceived(self, data):
        print data,


class StdinProtocol(LineReceiver):
    from os import linesep as delimiter

    def __init__(self, client):
        self._client = client

    def connectionMade(self):
        self.transport.write('>>> ')

    def lineReceived(self, line):
        print 'writing line: %s' % line
        self._client.transport.write(line + os.linesep)


def printError(failure):
    print str(failure)


def main():
    point = endpoints.UNIXClientEndpoint(reactor, './test.sock')
    proto = CommandProtocol()
    d = endpoints.connectProtocol(point, proto)
    d.addErrback(printError)

    stdio.StandardIO(StdinProtocol(proto))
    reactor.run()


main()

import os
import stat
from twisted.internet import protocol, reactor, endpoints, stdio
from twisted.protocols.basic import LineReceiver


class CommandProtocol(protocol.Protocol):
    def dataReceived(self, data):
        print data,


class StdinProtocol(LineReceiver):
    from os import linesep as delimiter

    def __init__(self, client):
        self._client = client

    def connectionMade(self):
        self.transport.write('>>> ')

    def lineReceived(self, line):
        print 'writing line: %s' % line
        self._client.transport.write(line + os.linesep)


def printError(failure):
    print str(failure)


def main():
    if os.stat('./test.sock').st_mode & (stat.S_IRGRP | stat.S_IRUSR | stat.S_IROTH):
        print "1"
        print "using control socket"
        point = endpoints.UNIXClientEndpoint(reactor, './test.sock')

        proto = CommandProtocol()
        d = endpoints.connectProtocol(point, proto)
        d.addErrback(printError)

        stdio.StandardIO(StdinProtocol(proto))
        reactor.run()
    else:
        print "not ready"


main()