~certify-web-dev/twisted/certify-staging

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><title>Twisted Documentation: The Evolution of Finger: a web frontend</title><link href="../stylesheet.css" type="text/css" rel="stylesheet" /></head><body bgcolor="white"><h1 class="title">The Evolution of Finger: a web frontend</h1><div class="toc"><ol><li><a href="#auto0">Introduction</a></li></ol></div><div class="content"><h2>Introduction<a name="auto0"></a></h2> This is the sixth part of the Twisted tutorial <a href="index.html">Twisted from Scratch, or The Evolution of Finger</a>.In this part, we demonstrate adding a web frontend using simple <code class="API"><a href="http://twistedmatrix.com/documents/8.2.0/api/twisted.web.resource.Resource.html" title="twisted.web.resource.Resource">twisted.web.resource.Resource</a></code> objects: <code class="python">UserStatusTree</code>, which will produce a listing of all

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<title>Twisted Documentation: The Evolution of Finger: a web frontend</title>

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<h1 class="title">The Evolution of Finger: a web frontend</h1>

<div class="toc"><ol><li><a href="#auto0">Introduction</a></li></ol></div>

<h2>Introduction<a name="auto0"/></h2>

This is the sixth part of the Twisted tutorial <a href="index.html" shape="rect">Twisted from Scratch, or The Evolution of Finger</a>.

In this part, we demonstrate adding a web frontend using simple <code class="API"><a href="http://twistedmatrix.com/documents/9.0.0/api/twisted.web.resource.Resource.html" title="twisted.web.resource.Resource">twisted.web.resource.Resource</a></code> objects: <code class="python">UserStatusTree</code>, which will produce a listing of all

users at the base URL (<code>/</code>) of our site; <code class="python">UserStatus</code>, which gives the status of each user at the

locaton <code>/username</code>; and <code class="python">UserStatusXR</code>,

which exposes an XMLRPC interface to <code class="python">getUser</code> and

<code class="python">getUsers</code> functions at the URL <code>/RPC2</code>.In this example we construct HTML segments manually. If the web interface

<code class="python">getUsers</code> functions at the URL <code>/RPC2</code>.

In this example we construct HTML segments manually. If the web interface

was less trivial, we would want to use more sophisticated web templating and

design our system so that HTML rendering and logic were clearly separated.<div class="py-listing"><pre>

# Do everything properly, and componentize

from twisted.application import internet, service

design our system so that HTML rendering and logic were clearly separated.

<div class="py-listing"><pre> 1

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# Do everything properly, and componentize

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from twisted.application import internet, service

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from twisted.internet import protocol, reactor, defer

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from twisted.words.protocols import irc

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from twisted.protocols import basic

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resource.Resource.__init__(self)

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self.service=service

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# add a specific child for the path "RPC2"

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self.putChild("RPC2", UserStatusXR(self.service))

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# add a specific child for the path "RPC2"

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self.putChild("RPC2", UserStatusXR(self.service))

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# need to do this for resources at the root of the site

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self.putChild("", self)

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# need to do this for resources at the root of the site

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self.putChild("", self)

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def _cb_render_GET(self, users, request):

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userOutput = ''.join(["<li><a href=\"%s\">%s</a></li>" % (user, user)

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d = self.service.getUsers()

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d.addCallback(self._cb_render_GET, request)

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# signal that the rendering is not complete

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return server.NOT_DONE_YET

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# signal that the rendering is not complete

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return server.NOT_DONE_YET

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def getChild(self, path, request):

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return UserStatus(user=path, service=self.service)

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d = self.service.getUser(self.user)

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# signal that the rendering is not complete

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return server.NOT_DONE_YET

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# signal that the rendering is not complete

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return server.NOT_DONE_YET

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class UserStatusXR(xmlrpc.XMLRPC):

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def __init__(self, filename):

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self.filename = filename

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self.users = {}

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self._read()

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def _read(self):

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self.users = {}

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self.users.clear()

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for line in file(self.filename):

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user, status = line.split(':', 1)

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user = user.strip()

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i.nickname = 'fingerbot'

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internet.TCPClient('irc.freenode.org', 6667, i

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).setServiceParent(serviceCollection)

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</pre><div class="caption">Source listing - <a href="listings/finger/finger20.tac">listings/finger/finger20.tac</a></div></div></div><a href="../index.html">Index</a>Version: 8.2.0</body></html>

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</pre><div class="caption">Source listing - <a href="listings/finger/finger20.tac">listings/finger/finger20.tac</a></div></div>

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<a href="../index.html">Index</a>

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Version: 9.0.0

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