python网络框架Twisted

from twisted.internet import reactor

def hello():
    print(‘Hello from the reactor loop!‘)
    print(‘Lately I feel like I\‘m stuck in a rut.‘)

# 将函数hello传入reactor
reactor.callWhenRunning(hello)
print(‘Starting the reactor.‘)
# 启动reactor后调用hello函数
reactor.run()

from  twisted.internet import reactor

class Countdown(object):
    counter=5
    def count(self):
        if self.counter==0:
            # 停止reactor的循环监听
            reactor.stop()
        else:
            print(self.counter,"...")
            self.counter-=1
            # 注册一个回调函数第一个参数是几秒回调,第二个参数是回调函数
            reactor.callLater(1,self.count)

reactor.callWhenRunning(Countdown().count)

print("start")
reactor.run()
print("stop!")

#执行结果
start
5 ...
4 ...
3 ...
2 ...
1 ...
stop!

from twisted.internet import reactor

# 异常函数
def falldown():
    raise Exception(‘I fall down.‘)

# 重启函数
def upagain():
    print(‘But I get up again.‘)
    # 注销stop,程序会继续执行,并不会崩溃,说明twisted的健壮性
    reactor.stop()

reactor.callWhenRunning(falldown)
reactor.callWhenRunning(upagain)

print(‘Starting the reactor.‘)
reactor.run()

import sys

from twisted.internet.protocol import ServerFactory
from twisted.protocols.basic import LineReceiver
from twisted.python import log
from twisted.internet import reactor

class CmdProtocol(LineReceiver):
    # 分隔符
    delimiter = "\n"

    # 连接成功事件，可重载
    def connectionMade(self):
        # 获取客户端的ip
        # getPeer获取客户端信息
        # getHost获取服务端信息
        self.client_ip=self.transport.getPeer().host# 日志记录来访客户端的ip
        log.msg("Client connection from %s" % self.client_ip)
        # 如果连接的客服端数量大于最大连接数,那么就关闭连接
        if len(self.factory.clients)>=self.factory.clients_max:
            log.msg("Too many connections. bye !")
            self.client_ip=None
            # 关闭连接
            self.transport.loseConnection()
        else:
            self.factory.clients.append(self.client_ip)

    # 连接断开事件，可重载，依靠reason区分断开类型
    def connectonLost(self,reason):
        log.msg(‘Lost client connection. Reason: %s‘ % reason)
        if self.client_ip:
            self.factory.clients.remove(self.client_ip)

    # 继承父类的方法，用于分发事件，不要重载
    def lineReceived(self, line):
        log.msg(‘Cmd received from %s : %s‘ % (self.client_ip, line))


class MyFactory(ServerFactory):
    # 指向一个协议类,我们自定义的
    protocol = CmdProtocol

    def __init__(self,clients_max=10):
        self.clients_max=clients_max
        self.clients=[]

# 配置将日志输出到stdout
log.startLogging(sys.stdout)
reactor.listenTCP(9999,MyFactory(2))
reactor.run()

#在cmd中输入:
Telnet 127.0.0.1 9999   测试