python 初次使用twisted

以下程序均来自《Python.UNIX和Linux系统管理指南》

用twisted实现检测tcp端口

twisted_check_tcp_port.py
#!/usr/bin/env python
from twisted.internet import reactor, protocol
import sys
class PortCheckerProtocol(protocol.Protocol):
        def __init__(self):
                print "Created a new protocol"
        def connectionMade(self):
                print "Connection made"
                reactor.stop()
class PortCheckerClientFactory(protocol.ClientFactory):
        protocol = PortCheckerProtocol
        def clientConnectionFailed(self, connector, reason):
                print "Connection failed because", reason
                reactor.stop()
if __name__ == '__main__':
        host, port = sys.argv[1].split(':')
        factory = PortCheckerClientFactory()
        print "Testing %s" % sys.argv[1]
        reactor.connectTCP(host, int(port), factory)
        reactor.run()

运行结果：

[root@centos python]# python twisted_check_tcp_port.py 127.0.0.1:80

Testing 127.0.0.1:80

Created a new protocol

Connection made

[root@centos python]# python twisted_check_tcp_port.py 127.0.0.1:8080

Testing 127.0.0.1:8080

Connection failed because [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionRefusedError'>: Connection was refused by other side: 111: Connection refused.

]

用twisted实现perspective broker

server端

twisted_perspectiv_broker.py
#!/usr/bin/env python
import os
from twisted.spread import pb
from twisted.internet import reactor
class PBDirLister(pb.Root):
        def remote_ls(self, directory):
                try:
                        return os.listdir(directory)
                except OSError:
                        return []
        def remote_ls_boom(self, directory):
                return os.listdir(directory)
if __name__ == '__main__':
        reactor.listenTCP(9876, pb.PBServerFactory(PBDirLister()))
        reactor.run()

client端

twisted_perspectiv_broker_client.py
#!/usr/bin/python env
from twisted.spread import pb
from twisted.internet import reactor
def handle_err(reason):
        print "an error occurred", reason
        reactor,stop()
def call_ls(def_call_obj):
        return def_call_obj.callRemote('ls', '/usr')
def print_ls(print_result):
        print print_result
        reactor.stop()
if __name__ == '__main__':
        factory = pb.PBClientFactory()
        reactor.connectTCP('localhost', 9876, factory)
        d = factory.getRootObject()
        d.addCallback(call_ls)
        d.addCallback(print_ls)
        d.addErrback(handle_err)
        reactor.run()

其中def_call_obj.callRemote('ls', '/usr') ls也可以换成ls_boom

运行结果：

运行服务端（如果正确，服务端不会打印任何东西）

[root@centos python]# python twisted_perspectiv_broker.py

运行客户端（正确运行会列出所要列出的目录，如果没有该目录则返回一个空列表）

[root@centos python]# python twisted_perspectiv_broker_client.py

['share', 'libexec', 'games', 'tmp', 'etc', 'lib', 'sbin', 'X11R6', 'kerberos', 'src', 'include', 'local', 'bin']