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标题:[python-chinese] low-level networking and event loop

2004年08月02日 星期一 10:02

Zoom.Quiet zoomq at infopro.cn
Mon Aug 2 10:02:43 HKT 2004

Hollo Zhiyuan.Ma:

  发布到Wiki 中了?
没有看到是也乎…………


/******** [2004-08-02]10:02:29 ; Zhiyuan.Ma wrote:

Zhiyuan.Ma> python-chinese,您好!

Zhiyuan.Ma> 	"编写TCP客户端"和"运用进程"我已经翻完了,不过忘在家里了.晚上上载
Zhiyuan.Ma> 	今天打算翻"UDP网络"
Zhiyuan.Ma> 	以前没有翻过东西,还请大家多多指正.

Zhiyuan.Ma> 	另外麻烦Zoomq看看是不是wiki格式我写的不对,怎么实例代码看起来和前面的很不同.

Zhiyuan.Ma>         致
Zhiyuan.Ma> 礼!
 				

Zhiyuan.Ma>         Jerry Marx
Zhiyuan.Ma>         zhiyuan.ma at enorbus.com.cn
Zhiyuan.Ma>           2004-08-02


********************************************/

-- 
Free as in Freedom

 Zoom.Quiet                           

#=========================================#
]Time is unimportant, only life important![
#=========================================#

sender is the Bat!2.12.00



[导入自Mailman归档:http://www.zeuux.org/pipermail/zeuux-python]

2004年08月02日 星期一 10:18

Jerry Marx zhiyuan.ma at enorbus.com.cn
Mon Aug 2 10:18:11 HKT 2004

Zoom.Quiet,您好!

	哦.我指的是"Reactor基础"和"编写TCP服务器"
	示例代码没有行号,颜色也不同.和finger教程相比

======= 2004-08-02 10:02:43 您在来信中写道:=======

>Hollo Zhiyuan.Ma:
>
>  发布到Wiki 中了?
>没有看到是也乎…………
>
>
>/******** [2004-08-02]10:02:29 ; Zhiyuan.Ma wrote:
>
>Zhiyuan.Ma> python-chinese,您好!
>
>Zhiyuan.Ma> 	"编写TCP客户端"和"运用进程"我已经翻完了,不过忘在家里了.晚上上载
>Zhiyuan.Ma> 	今天打算翻"UDP网络"
>Zhiyuan.Ma> 	以前没有翻过东西,还请大家多多指正.
>
>Zhiyuan.Ma> 	另外麻烦Zoomq看看是不是wiki格式我写的不对,怎么实例代码看起来和前面的很不同.
>
>Zhiyuan.Ma>         致
>Zhiyuan.Ma> 礼!
> 				
>
>Zhiyuan.Ma>         Jerry Marx
>Zhiyuan.Ma>         zhiyuan.ma at enorbus.com.cn
>Zhiyuan.Ma>           2004-08-02
>
>
>********************************************/
>
>-- 
>Free as in Freedom
>
> Zoom.Quiet                           
>
>#=========================================#
>]Time is unimportant, only life important![
>#=========================================#
>
>sender is the Bat!2.12.00
>
>_______________________________________________
>python-chinese list
>python-chinese at lists.python.cn
>http://python.cn/mailman/listinfo/python-chinese
>

= = = = = = = = = = = = = = = = = = = =
			

        致
礼!
 
				 
        Jerry Marx
        zhiyuan.ma at enorbus.com.cn
          2004-08-02


[导入自Mailman归档:http://www.zeuux.org/pipermail/zeuux-python]

2004年08月02日 星期一 10:18

limodou chatme at 263.net
Mon Aug 2 10:18:16 HKT 2004

HD,您好!

	明明有呀,how-to中都有。再说这也是socket中的一种标准呀。

======= 2004-08-02 09:24:40 您在来信中写道:=======

>不知为什么这位黎达同仁对twisted一直很鄙视,到是听说他以经用python写了很牛的东东呢。 :)
>他们的应用一定支持udp,我们慢慢挖twisted罢,如果不成我们给twisted加上udp功能好不好? ^_^
>
>On Mon, 2 Aug 2004 09:10:46 +0800, limodou <chatme at 263.net> wrote:
>> 黎达?ldw,您好!
>> 
>>         怎么可能没有。
>> 
>
>-- 
>HD(燃烧中的火)
>我工作我快乐,我勤奋我收获。请与我一起快乐,与我一起收获。
>_______________________________________________
>python-chinese list
>python-chinese at lists.python.cn
>http://python.cn/mailman/listinfo/python-chinese
>

= = = = = = = = = = = = = = = = = = = =
			

        致
礼!
 
				 
        limodou
        chatme at 263.net
          2004-08-02


[导入自Mailman归档:http://www.zeuux.org/pipermail/zeuux-python]

2004年08月02日 星期一 10:18

limodou chatme at 263.net
Mon Aug 2 10:18:56 HKT 2004

info,您好!

	api也是python源代码呀。我的意思是我们把该做的都做了,别人只是一个简单的调用罢了。

======= 2004-08-02 09:55:01 您在来信中写道:=======

>limodou,您好!
>
>	直接提供python的代码不是好些吗?我们是在做开源的项目啊。如果别人有兴趣可以用其他语言按照协议来重些不就行了吗?
>
>======= 2004-08-02 09:10:14 您在来信中写道:=======
>
>>info,您好!
>>
>>	我想对于客户端我们首先要提供的是一个可用的API包。那么这个API包可能就有线程的内容。我们不仅要考虑稳定,还要考虑可扩展性。我们不能排除客户端的多线程访问,也许API不提供,那么客户端可能就会自已来实现了,既然如此,还不如由我们来提供为好。
>>
>>======= 2004-08-02 08:52:45 您在来信中写道:=======
>>
>>>limodou,您好!
>>>
>>>	用twisted写的服务器端本身就处理的多线程,这个大家可以用我们做测试的例子来试。
>>>    对于客户端来讲,除非是传输文件本身,没有必要采用多线程。
>>>    我的意见是,达到本期的产品基线,然后用最稳定、最简洁的方式来实现。
>>>
>>>======= 2004-08-01 16:50:58 您在来信中写道:=======
>>>
>>>>hoxide,您好!
>>>>
>>>>	的确,整个程序只有一个线程,那么这种异步都通过twisted来完成,的确象queue这种阻塞方式就无法实现了。多线程,多点测试才更符合实际。
>>>>
>>>>
>>>>======= 2004-08-01 15:28:13 您在来信中写道:=======
>>>>
>>>>>limodou,您好!
>>>>>
>>>>>	开始我们也尝试过用queue的阻塞处理,但这样就阻塞了主线程,连recive都不行.
>>>>>这个问题的根本解决方案还是用线程,我只是提供一种类似的东西("轻便线程"http://www-900.ibm.com/developerWorks/cn/linux/sdk/python/)
>>>>>另外我觉得应该建一个多连接的测试程序,而不只是一个连接多请求的测试程序.
>>>>>而窗口应该放在服务端比较好一点
>>>>>
>>>>>======= 2004-08-01 14:54:55 您在来信中写道:=======
>>>>>
>>>>>>hoxide,您好!
>>>>>>
>>>>>>	其实真正的数据发送是由客户端做的,我们可以把连接、发送数据等进行封装由客户端来调用。这样由客户端去组织数据,而我们的协议处理只是一个被调用方就行了。因为这只是一个测试程序,还不是真正的应用,因此可能就不讲究了。真正做成客户端,可能程序都要改了。既然我们不想发送太快,queue完全可以采用阻塞方式来处理。                                                                      
>>>>>>                                                                            
>>>>>>======= 2004-08-01 14:31:17 您在来信中写道:=======
>>>>>>
>>>>>>>limodou,您好!
>>>>>>>
>>>>>>>	这点我直到但是程序还是依赖一个全局变量,对于复杂的情况,这种用法是不好的,首先明显得会带来名字空间的污染,其次如果程序执行的上下文关系复杂,那么也就不是几个全局变量能轻松解决的.
>>>>>>>
>>>>>>>
>>>>>>>======= 2004-08-01 14:07:21 您在来信中写道:=======
>>>>>>>
>>>>>>>>hoxide,您好!
>>>>>>>>
>>>>>>>>	其实不丢message也可以,这样不用使用生成器。只要把message生成放到else中就行了。因为那时是可以发送数据的。之所以丢是因为先生成了message,然后才判断是否可以发送,如果不能发送自然就丢了。如果改到可以发送才生成message就不会丢了。
>>>>>>>>
>>>>>>>>        while nownum < count:
>>>>>>>>            if self.factory.sendQueue.full():       
>>>>>>>>                self.call = reactor.callLater(0, self.testserver)
>>>>>>>>                return 
>>>>>>>>            else:
>>>>>>>>                message = usspmsg.USSPMessage()                   #*
>>>>>>>>                message.setMsgName('mail_counter')                #*
>>>>>>>>                message.body.setField('uid',str(nownum))          #* 这几行移下来了
>>>>>>>>                self.factory.sendQueue.put_nowait(message)
>>>>>>>>                nownum += 1
>>>>>>>>
>>>>>>>>======= 2004-08-01 12:19:47 您在来信中写道:=======
>>>>>>>>
>>>>>>>>>HD,您好!
>>>>>>>>>
>>>>>>>>>大家最好先了解一下生成器的有关知识:IBM上的《可爱的 Python:迭代器和简单生成器》: http://www-900.ibm.com/developerWorks/cn/linux/sdk/python/charm-20/index.shtml
>>>>>>>>>
>>>>>>>>>昨天给的代码还有点错误,修改的代码(其实只改了打星号的地方):
>>>>>>>>>
>>>>>>>>>    def testserver(self):
>>>>>>>>>        """向服务器发的测试报文"""
>>>>>>>>>        try:
>>>>>>>>>            self.pp.next()
>>>>>>>>>            self.call = reactor.callLater(0,self.testserver)
>>>>>>>>>            return
>>>>>>>>>        except StopIteration:
>>>>>>>>>            pass
>>>>>>>>>   
>>>>>>>>>    def __init__(self):
>>>>>>>>>        self.pp=self.sendQQ()
>>>>>>>>>        ussp.USSClientQueueProtocol.__init__(self)
>>>>>>>>>        
>>>>>>>>>    def sendQQ(self):
>>>>>>>>>        global nownum
>>>>>>>>>        global count
>>>>>>>>>        i=1
>>>>>>>>>        while i < count:
>>>>>>>>>            message = usspmsg.USSPMessage()
>>>>>>>>>            message.setMsgName('mail_counter')
>>>>>>>>>            message.body.setField('uid',str(i))  
>>>>>>>>>            while self.factory.sendQueue.full():        #*  
>>>>>>>>>                yield None                              #**
>>>>>>>>>            self.factory.sendQueue.put_nowait(message)
>>>>>>>>>            i += 1
>>>>>>>>>        nownum=i
>>>>>>>>>        self.disconnect()
>>>>>>>>>
>>>>>>>>>这里真正的处理是在sendQQ这个函数定义的.self.pp是生成器的实例,由__init__()生成,testserver只是调度完成这个处理的函数,而且是和具体的处理独立的,他只是简单得实现了当处理"暂停"后的重新启动.
>>>>>>>>>
>>>>>>>>>真正神奇的地方是打星号的行.他测试sendQueue确定是否能发出message,如果不能就会执行yield None,这时函数就终止在**这行,直到在有.next()方法调用时再从这句开始执行.
>>>>>>>>>这个好处是原来的处理流程可以很顺利得进行.不需要保存中间变量.注意0731a的testserver能正确得发出所有message,是因为恰巧有全局变量nownum完全确定处理的执行状态了.但事事上一般的处理不会那么简单,有复杂的状态组合(上面的代码并没用nownum,而是用了循环变量i,注意他不是全局的!!!!!).正像zoomq昨天说的0731a的testserver在queue满的时候前面对message的处理就被抛弃了,但在这个生成器版本,先前对message的处理没有被抛弃.
>>>>>>>>>
>>>>>>>>>个人觉得这个生成器版本还是不够完美,异步传输还是应该以线程为基础进行.下一个版本可能是基于生成器的简单线程:)
>>>>>>>>>
>>>>>>>>>说得不是很明白,我不清楚大家对什么地方有疑问.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>===== 2004-08-01 00:33:08 您在来信中写道:=======
>>>>>>>>>
>>>>>>>>>>细说说,为什么说是生成器版的呢?
>>>>>>>>>>
>>>>>>>>>>On Sat, 31 Jul 2004 23:22:53 +0800, hoxide <hoxide_dirac at yahoo.com.cn> wrote:
>>>>>>>>>>> python-chinese,您好!
>>>>>>>>>>> 
>>>>>>>>>>>           为什么要用生成器,现在的testserver的执行流程只依赖于nownum,而事实上通常的服务要依赖于整个运行流程.另外这样的写法可将窗口部分的代码抽出.
>>>>>>>>>>> 
>>>>>>>>>>>>>>>>>>>>>> 礼!
>>>>>>>>>>> 
>>>>>>>>>>> hoxide
>>>>>>>>>>> hoxide_dirac at yahoo.com.cn
>>>>>>>>>>> 2004-07-31
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>-- 
>>>>>>>>>>HD(燃烧中的火)
>>>>>>>>>>我工作我快乐,我勤奋我收获。请与我一起快乐,与我一起收获。
>>>>>>>>>>_______________________________________________
>>>>>>>>>>python-chinese list
>>>>>>>>>>python-chinese at lists.python.cn
>>>>>>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>= = = = = = = = = = = = = = = = = = = =
>>>>>>>>>			
>>>>>>>>>
>>>>>>>>>        致
>>>>>>>>>礼!
>>>>>>>>> 
>>>>>>>>>				 
>>>>>>>>>        hoxide
>>>>>>>>>        hoxide_dirac at yahoo.com.cn
>>>>>>>>>          2004-08-01
>>>>>>>>>
>>>>>>>>>_______________________________________________
>>>>>>>>>python-chinese list
>>>>>>>>>python-chinese at lists.python.cn
>>>>>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>>>>>
>>>>>>>>
>>>>>>>>= = = = = = = = = = = = = = = = = = = =
>>>>>>>>			
>>>>>>>>
>>>>>>>>        致
>>>>>>>>礼!
>>>>>>>> 
>>>>>>>>				 
>>>>>>>>        limodou
>>>>>>>>        chatme at 263.net
>>>>>>>>          2004-08-01
>>>>>>>>
>>>>>>>>_______________________________________________
>>>>>>>>python-chinese list
>>>>>>>>python-chinese at lists.python.cn
>>>>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>>>>
>>>>>>>
>>>>>>>= = = = = = = = = = = = = = = = = = = =
>>>>>>>			
>>>>>>>
>>>>>>>        致
>>>>>>>礼!
>>>>>>> 
>>>>>>>				 
>>>>>>>        hoxide
>>>>>>>        hoxide_dirac at yahoo.com.cn
>>>>>>>          2004-08-01
>>>>>>>
>>>>>>>_______________________________________________
>>>>>>>python-chinese list
>>>>>>>python-chinese at lists.python.cn
>>>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>>>
>>>>>>
>>>>>>= = = = = = = = = = = = = = = = = = = =
>>>>>>			
>>>>>>
>>>>>>        致
>>>>>>礼!
>>>>>> 
>>>>>>				 
>>>>>>        limodou
>>>>>>        chatme at 263.net
>>>>>>          2004-08-01
>>>>>>
>>>>>>_______________________________________________
>>>>>>python-chinese list
>>>>>>python-chinese at lists.python.cn
>>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>>
>>>>>
>>>>>= = = = = = = = = = = = = = = = = = = =
>>>>>			
>>>>>
>>>>>        致
>>>>>礼!
>>>>> 
>>>>>				 
>>>>>        hoxide
>>>>>        hoxide_dirac at yahoo.com.cn
>>>>>          2004-08-01
>>>>>
>>>>>_______________________________________________
>>>>>python-chinese list
>>>>>python-chinese at lists.python.cn
>>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>>
>>>>
>>>>= = = = = = = = = = = = = = = = = = = =
>>>>			
>>>>
>>>>        致
>>>>礼!
>>>> 
>>>>				 
>>>>        limodou
>>>>        chatme at 263.net
>>>>          2004-08-01
>>>>
>>>>_______________________________________________
>>>>python-chinese list
>>>>python-chinese at lists.python.cn
>>>>http://python.cn/mailman/listinfo/python-chinese
>>>>
>>>
>>>= = = = = = = = = = = = = = = = = = = =
>>>			
>>>
>>>        致
>>>礼!
>>> 
>>>				 
>>>        info
>>>        info at xichen.com
>>>          2004-08-02
>>>
>>>_______________________________________________
>>>python-chinese list
>>>python-chinese at lists.python.cn
>>>http://python.cn/mailman/listinfo/python-chinese
>>>
>>
>>= = = = = = = = = = = = = = = = = = = =
>>			
>>
>>        致
>>礼!
>> 
>>				 
>>        limodou
>>        chatme at 263.net
>>          2004-08-02
>>
>>_______________________________________________
>>python-chinese list
>>python-chinese at lists.python.cn
>>http://python.cn/mailman/listinfo/python-chinese
>>
>
>= = = = = = = = = = = = = = = = = = = =
>			
>
>        致
>礼!
> 
>				 
>        info
>        info at xichen.com
>          2004-08-02
>
>_______________________________________________
>python-chinese list
>python-chinese at lists.python.cn
>http://python.cn/mailman/listinfo/python-chinese
>

= = = = = = = = = = = = = = = = = = = =
			

        致
礼!
 
				 
        limodou
        chatme at 263.net
          2004-08-02


[导入自Mailman归档:http://www.zeuux.org/pipermail/zeuux-python]

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