IT妖怪 » Python http://blog.ityao.com 热爱生活，热爱程序 Wed, 03 Aug 2011 02:56:30 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 [Twisted]-Hello World http://blog.ityao.com/archives/450 http://blog.ityao.com/archives/450#comments Mon, 02 Nov 2009 04:12:35 +0000 Daniel Yang http://blog.ityao.com/?p=450 使用一下twisted的getPage功能. 体会python语法特点.

代码:

# -*- coding: utf-8 -*-

from twisted.web.client import getPage
from twisted.internet import reactor

def printContents(contents):

	print "获得内容:"
	print contents.upper()

	reactor.stop()

def errorHandler(error):
	print error

	reactor.stop()

#请求
deferred = getPage("http://localhost/test/Babel_s/yappr.php")

#添加回调
deferred.addCallback(printContents)
deferred.addErrback(errorHandler)

#反应堆~
reactor.run()

说明:
1. python中, 注释一般是用 ”’ 这种方式 ”’ 的.
2. 没有{}来表示运行块, 用indent的深度来识别; 不适用分号来表示语句结束.
3. 指定encode的标记十分特别.
4. callback方式的.
5. Deferred对象来自于twisted.internet.defer.Deferred.
6.Python是case sensitive…

如果程序运行正常, 可以获得google首页所有的html代码.

]]> http://blog.ityao.com/archives/450/feed 0 [Twisted]基础介绍.安装 http://blog.ityao.com/archives/448 http://blog.ityao.com/archives/448#comments Mon, 02 Nov 2009 04:10:50 +0000 Daniel Yang http://blog.ityao.com/?p=448 介绍
twisted 是python下一个事件驱动的网络引擎库, 支持很多种的协议.
它包含了一个web服务, 多种IM客户端,服务端, 邮件服务协议. 由于规模庞大, twisted分成了几个sub-project. 一起或者分开发布.

稳定性
twisted并不是从0.1发展到8.1.0的. 是一下子跳到8的. 8.1.0是最新的stable的包.
从successful stories来看, 它的客户包括NASA这种级别的(http://twistedmatrix.com/trac/wiki/SuccessStories#NASA).

效率
twisted具有惊人的效率.
下面是一些twisted和Mina对比测试数据.

http://blog.bluendo.com/ff/mina-and-twisted-matrix-benchmarks

Leopard下的安装
下载, 运行.
建议是从源码安装。
windows下，可能需要安装openssl相关的库。

]]> http://blog.ityao.com/archives/448/feed 0 Twisted下的Flash文件上传 http://blog.ityao.com/archives/59 http://blog.ityao.com/archives/59#comments Tue, 08 Sep 2009 14:22:49 +0000 Daniel Yang http://blog.cnflex.org/?p=59 Flash Player的文件上传很是让人憋火。除了PHP，CF，Asp.net和它配合良好–不会有差错。
Python下就没有那么方便了。
我曾经在web.py下，试了几天，后来没法子用Django才搞定的。
总是有莫名其妙的问题。

我在Twisted的邮件列表里发了一通：

I’ve been trying to upload files to twisted.web2 backend(FileSaver) with Adobe Flex and I am always getting IOError.
(code see below)
After some sniffing work, I found the error messages returned by twisted.web2:

Unexpected data on same line as boundary: ‘–’

I believe this flex app works with php backend. So this might be with twisted.web2 or flash player’s malformed post data.

It seems the twisted error comes from fileupload.py:
(I added 2 prints)

    def _readBoundaryLine(self):
        print "_readBoundaryLine"
        line = self.stream.readline(size=1024)
        if isinstance(line, defer.Deferred):
            line = defer.waitForDeferred(line)
            yield line
            line = line.getResult()
        print line
        if line == "--\r\n":
            # THE END!
            yield False
            return
        elif line != "\r\n":
            raise MimeFormatError("Unexpected data on same line as boundary: %r" % (line,))
        yield True
        return
    _readBoundaryLine = defer.deferredGenerator(_readBoundaryLine)

with html uploading form, it outputs:

2009-08-20 23:06:08+0800 [-] _readBoundaryLine
2009-08-20 23:06:08+0800 [-] –
2009-08-20 23:06:08+0800 [-]
2009-08-20 23:06:08+0800 [-] ——–
2009-08-20 23:06:08+0800 [-] FileUpload

but with flex uploading:

2009-08-20 23:06:27+0800 [-] _readBoundaryLine
2009-08-20 23:06:27+0800 [-]
2009-08-20 23:06:27+0800 [-]
2009-08-20 23:06:27+0800 [-] _readBoundaryLine
2009-08-20 23:06:27+0800 [-]
2009-08-20 23:06:27+0800 [-]
2009-08-20 23:06:27+0800 [-] _readBoundaryLine
2009-08-20 23:06:27+0800 [-] –

Same file, different posted data.

Any ideas?

Does this happen to be a bug, or is there any way to walk around this?

My testing code:

python code:

from twisted.web2 import http_headers, resource, \
	static, server, channel, http, responsecode
from twisted.python import util

FORMHTML = """
<html>
<p>for test</p>
<form action="/upload" method="post" enctype="multipart/form-data">
	<input type="file" name="FileUpload" />
	<input type="submit" value="Upload"/>
</form>
</html>
"""

class MyFileSaver(static.FileSaver):
	"""for test only"""
	def render(self, req):
		print req, '--------'
		if req.files:
			for fieldName in req.files:
				print fieldName

		return http.Response(responsecode.OK, {}, stream='ok')

class Toplevel(resource.Resource):
  addSlash = True
  def render(self, ctx):
	return http.Response(stream=FORMHTML)

  child_upload = MyFileSaver(util.sibpath(__file__, ''),
  	expectedFields=['FileUpload'],
  		allowedTypes=(
  			http_headers.MimeType('image', 'jpeg'),
  			http_headers.MimeType('image', 'png'),
  			http_headers.MimeType('image', 'gif'),
  		)
  	)
  child_swf = static.File(util.sibpath(__file__, 'FileUpload.swf'))
site = server.Site(Toplevel())

# Standard twisted application Boilerplate
from twisted.application import service, strports
application = service.Application("demoserver")
s = strports.service('tcp:8080', channel.HTTPFactory(site))
s.setServiceParent(application)

My flex code:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/09/21/uploading-files-in-flex-using-the-filereference-class/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">

    <mx:Script>
        <![CDATA[
            private var fileRef:FileReference;

            private const FILE_UPLOAD_URL:String = "http://127.0.0.1:8080/upload";

            private function init():void {
                fileRef = new FileReference();
                fileRef.addEventListener(Event.SELECT, fileRef_select);
                fileRef.addEventListener(ProgressEvent.PROGRESS, fileRef_progress);
                fileRef.addEventListener(Event.COMPLETE, fileRef_complete);
                fileRef.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler);
                fileRef.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onSec);
            }

            private function browseAndUpload():void {
                fileRef.browse();
                message.text = "";
            }

            private function ioErrorHandler(event:IOErrorEvent):void {
            	trace(event);
            }

            private function onSec(event:SecurityErrorEvent):void{
            	trace(event);
            }

            private function fileRef_select(evt:Event):void {
                try {
                    message.text = "size (bytes): " + numberFormatter.format(fileRef.size);

                    var req:URLRequest = new URLRequest();
                    req.url = FILE_UPLOAD_URL;
                    req.method = URLRequestMethod.POST;

                    fileRef.upload(req, "FileUpload");
                } catch (err:Error) {
                    message.text = "ERROR: zero-byte file";
                }
            }

            private function fileRef_progress(evt:ProgressEvent):void {
                progressBar.visible = true;
            }

            private function fileRef_complete(evt:Event):void {
                message.text += " (complete)";
                progressBar.visible = false;
            }
        ]]>
    </mx:Script>

    <mx:NumberFormatter id="numberFormatter" />

    <mx:Button label="Upload file"
            click="browseAndUpload();" />
    <mx:Label id="message" />
    <mx:ProgressBar id="progressBar"
            indeterminate="true"
            visible="false" />

</mx:Application>

解决方法：
暂时没有，但是有一个patch:

http://twistedmatrix.com/trac/ticket/2113

一起哭吧。。。

]]> http://blog.ityao.com/archives/59/feed 3