本文主要是介绍twisted 使用application框架制作守护进程,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
官方文档
http://twistedmatrix.com/documents/12.2.0/core/howto/application.html
起由:
用twisted写了一个程序,只能像脚本一样运行,ctrl+c 就退出了,如果用screen 或者nohup都有一些问题,查了一下twsited自带daemon应用框架,于是赶紧google了一下(顺便提一下,没有抗争就没有自由,目前还可以用的google镜像地址:https://s3-ap-southeast-1.amazonaws.com/google.cn/index.html),现在做一点笔记,方便下次查阅。
可以有多种方式实现守护进程,这里介绍2种:
第一种:非插件式的
原文的概念有点难啃,我喜欢画个图来加深下自己的理解。
下面贴一段自己的代码
from twisted.internet import reactor
from twisted.internet.protocol import ServerFactory
from twisted.protocols import basic
import cx_Oracle
from twisted.application import service, internetclass Mornitor_Protocol(basic.LineReceiver):def __init__(self):#不知道要写什么_oracle_conn=cx_Oracle.connect('xxx', 'xxx', '192.168.7.17/test', threaded=True)_oracle_conn.autocommit = Trueself.cur = _oracle_conn.cursor()self._oracle_conn=_oracle_conndef ruku(self, line):ip = self.transport.getPeer().host#获取客户端IPline=line.split(':::')#使用:::分割原始数据if line[1] in ['cpu', 'mem', 'disk', 'tcp', 'net', 'process_down']:#根据数据包头来确定使用insert还是update,当是tcp包头的时候插入,其余的更新if line[1] == 'tcp':sql = "insert into MORNITOR_BASICINFO (ipadd,time,tcp) values (\'%s\',\'%s\',\'%s\')"%(ip,line[0],line[3])print sqlself.cur.execute(sql)else:line_again = line[3].split('::')sql = 'update MORNITOR_BASICINFO set %s=\'%s\',%s=\'%s\' where ipadd=\'%s\' and time=\'%s\''%(line[1],line_again[0],line[2],line_again[1],ip,line[0])print sqlself.cur.execute(sql)def connectionMade(self):print 'Connected!'def lineReceived(self, line):print lineself.ruku(line)#接受到数据之后执行入库操作!def connectionLost(self, reason='connectionDone'):self._oracle_conn.close()print 'The db is close... ok!'class Mornitor_Factory(ServerFactory):#还没想好要初始化什么protocol = Mornitor_Protocoldef __init__(self,service):self.service = serviceclass Fish_Service(service.Service):def startService(self):service.Service.startService(self)def stopService(self):return self._port.stopListening()port = 8888
iface = '192.168.7.188'top_service = service.MultiService()fish_server =Fish_Service()
factory = Mornitor_Factory(Fish_Service)
fish_server.setServiceParent(top_service)tcp_service = internet.TCPServer(port, factory, interface=iface)
tcp_service.setServiceParent(top_service)application = service.Application("SmallFish--Monitor")# this hooks the collection we made to the application
top_service.setServiceParent(application)
使用 twisted -y main.py (脚本名称) 就可以以守护进程的方式运行了!
第二种:插件式
何谓插件式?
举个例子就是不敲任何参数,直接在命令行打twisted后,可以看到的一些插件,如下:
dwj@WaitFish ~ $ twistd twistd reads a twisted.application.service.Application out of a file and runs
it.
Commands:conch A Conch SSH service.dns A domain name server.ftp An FTP server.inetd An inetd(8) replacement.mail An email servicemanhole An interactive remote debugger service accessible viatelnet and ssh and providing syntax coloring and basic lineediting functionality.manhole-old An interactive remote debugger service.news A news server.portforward A simple port-forwarder.procmon A process watchdog / supervisorsocks A SOCKSv4 proxy service.telnet A simple, telnet-based remote debugging service.web A general-purpose web server which can serve from afilesystem or application resource.words A modern words serverxmpp-router An XMPP Router server
略去usage 就是上面的输出,其中twisted自带的插件有常见的一些协议如ftp mail news web telnet等等~~
如果能将自己的应用程序注册成插件岂不是一件很爽快的事情。
以下是插件结构IServiceMaker指定了三个属性和一个方法:(转载自https://github.com/luocheng/twisted-intro-cn/blob/master/p16.rst#iservicecollection)
- tapname: 代表插件名字的字符串. "tap"代表"Twisted Application Plugin". 注:老版本的Twisted还使用"tapfiles"文件,不过这个功能现在已经取消了.
- description: 插件的描述, twistd 将以它作为帮助信息输出.
- options: 一个代表这个插件接受的命令行选项的对象.
- makeService: 一个创建 IService 对象的方法,需提供一些特定的命令行选项.
继续贴上刚才的代码用插件来实现:
from twisted.internet import reactor
from twisted.internet.protocol import ServerFactory
from twisted.protocols import basic
import cx_Oracle
from twisted.application import service, internet
from zope.interface import implements
from twisted.python import usage, log
from twisted.plugin import IPluginclass Mornitor_Protocol(basic.LineReceiver):def __init__(self):#不知道要写什么_oracle_conn=cx_Oracle.connect('xxx', 'xxx', '192.168.7.17/test', threaded=True)_oracle_conn.autocommit = Trueself.cur = _oracle_conn.cursor()self._oracle_conn=_oracle_conndef ruku(self, line):ip=self.transport.getPeer().host#获取客户端IPline=line.split(':::')#使用:::分割原始数据if line[1] in ['cpu', 'mem', 'disk', 'tcp', 'net', 'process_down']:#根据数据包头来确定使用insert还是update,当是tcp包头的时候插入,其余的更新if line[1] == 'tcp':sql = "insert into MORNITOR_BASICINFO (ipadd,time,tcp) values (\'%s\',\'%s\',\'%s\')"%(ip,line[0],line[3])print sqlself.cur.execute(sql)else:line_again = line[3].split('::')sql = 'update MORNITOR_BASICINFO set %s=\'%s\',%s=\'%s\' where ipadd=\'%s\' and time=\'%s\''%(line[1],line_again[0],line[2],line_again[1],ip,line[0])print sqlself.cur.execute(sql)def connectionMade(self):print 'Connected!'def lineReceived(self, line):print lineself.ruku(line)#接受到数据之后执行入库操作!def connectionLost(self, reason='connectionDone'):self._oracle_conn.close()print 'The db is close... ok!'class Mornitor_Factory(ServerFactory):#还没想好要初始化什么def __init__(self, s):self.service = sprotocol = Mornitor_Protocolclass Fish_Service(service.Service):def __init__(self):self._port=8007def startService(self):service.Service.startService(self)class Options(usage.Options):optParameters = [['port', 'p', 10000, 'The port number to listen on.'],['iface', None, 'localhost', 'The interface to listen on.'],]class Fish_Service_Make(object):implements(service.IServiceMaker, IPlugin)tapname = "smallfish" #这里给插件取个好听的名字description = "A monitor daemon!" #插件的描述options = Options #可供插件选择的选项def makeService(self, options):top_service = service.MultiService() #定义service容器fish_service = Fish_Service() #实例化自己定义的servicefish_service.setServiceParent(top_service) #把自定义的service丢进容器factory = Mornitor_Factory(fish_service) #工厂化自定义服务tcp_service = internet.TCPServer(int(options['port']), factory, #tcp连接工厂化,一些连接参数通过option获取interface=options['iface'])tcp_service.setServiceParent(top_service) #把tcp sevice丢进容器 return top_serviceservice_maker = Fish_Service_Make()
要使用twisted +插件名称的方式运行程序有几点要求:
1.插件程序必须在python的搜索路径
export PYTHONPATH=$PYTHONPATH:/home/user/yourpath
2.插件程序必须处于twisted/plugins 这样的目录结构下
your projects/
├──
twisted
└── plugins
└──xxxx_plugin.py
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