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Update documentation of the HTTP server; expand it to cover templates.
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Valentin Lorentz
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@ -5,23 +5,20 @@ Using Limnoria's HTTP server in your plugins
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Introduction
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============
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Having a HTTP server in an IRC may be baffling, because it seems to be useless.
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Yes, you are right, it is useless in most of the cases. But it may be cool.
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Limnoria provides an HTTP server to plugins. This is not relevant for most
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plugins, but some of them have to start a server (either for serving a website
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or for being remotely called).
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The HTTP server provided by Limnoria aims at starting a single server for
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all of them, which means less used port and less resources usage.
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Some plugins (WebStats, Github, and UfrPaste are the only one, as far as I
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know) have their own embedded HTTP server. Unfortunately, a HTTP need a port,
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and consumes a few resources (CPU/memory). So, if you want many of these plugins,
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it becomes embarrassing.
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Last pro for this server: a plugin that use this HTTP server is really tinier,
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as shown in `this commit`_ (note that the path of the httpserver is no more
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*supybot.utils.httpserver* but *supybot.httpserver*)
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Some example plugins are `Factoids`_, `WebStats`_, `GitHub`_, UfrPaste, and
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`WebDoc`_
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.. _this commit: https://github.com/ProgVal/Supybot-plugins/commit/220146ea
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.. _Factoids: https://github.com/ProgVal/Limnoria/tree/master/plugins/Factoids
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.. _WebStats: https://github.com/ProgVal/Limnoria/tree/master/plugins/WebStats
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.. _GitHub: https://github.com/ProgVal/Limnoria/tree/master/plugins/GitHub
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.. _WebDoc: https://github.com/ProgVal/Limnoria/tree/master/plugins/WebDoc
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Anyway, if you are on this page, this is probably because you want to use this
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HTTP server, so I don't need to convince you.
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Before reading further, be sure you have a Limnoria (or any Supybot fork that
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merged this HTTP server).
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Using the HTTP server in a plugin
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=================================
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@ -31,8 +28,8 @@ Let's try to make a basic dictionary about Supybot! We'll call it Supystory.
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We want to get plain text information about Supybot, Gribble, and Limnoria when
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accessing http://localhost:8080/supystory/supybot,
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http://localhost:8080/supystory/gribble, and
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http://localhost:8080/supystory/limnoria, and an HTML error page if the page
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is not found
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http://localhost:8080/supystory/limnoria, an index page, and an HTML error page
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if the page is not found
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Importing the HTTP server
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-------------------------
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@ -41,7 +38,6 @@ On only have to add this line::
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import supybot.httpserver as httpserver.
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Creating a callback
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-------------------
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@ -131,18 +127,36 @@ Here is the code of the callback... pretty much simple, as ever::
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def doGet(self, handler, path):
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if path == '/supybot':
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response = 'Supybot is the best IRC bot ever.'
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response = b'Supybot is the best IRC bot ever.'
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elif path == '/gribble':
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response = 'Thanks to Gribble, we have many bug fixes and SQLite 3 support'
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response = b'Thanks to Gribble, we have many bug fixes and SQLite 3 support'
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elif path == '/limnoria':
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response = 'Because of Limnoria, you need to internationalize your plugins and read this f*cking doc.'
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else:
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response = None
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if response is None:
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handler.send_response(404) # Not found, as described by the HTTP protocol
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response = b'Thanks to Limnoria, you can to internationalize your plugins and write a web server.'
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elif path == '' or path == '/':
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handler.send_response(200) # Found
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handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
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handler.end_headers() # We won't send more headers
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handler.wfile.write("""
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handler.wfile.write(b"""
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<html>
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<head>
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<title>Supystory</title>
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</head>
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<body>
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<h1>Supystory</h1>
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<p>
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Here are some links you can visit:
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<a href="./supybot">Supybot</a>
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<a href="./gribble">Gribble</a>
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<a href="./limnoria">Limnoria</a>
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</p>
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</body>
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</html>""")
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return
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else:
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handler.send_response(404) # Not found
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handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
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handler.end_headers() # We won't send more headers
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handler.wfile.write(b"""
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<html>
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<head>
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<title>Error</title>
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@ -157,13 +171,90 @@ Here is the code of the callback... pretty much simple, as ever::
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</p>
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</body>
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</html>""")
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else:
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handler.send_response(404) # Not found, as described by the HTTP protocol
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handler.send_header('Content-type', 'text/plain') # This is the MIME for plain text
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return
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handler.send_response(200)
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handler.send_header('Content-type', 'text/plain') # This is the MIME for plain text
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handler.end_headers() # We won't send more headers
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handler.wfile.write(response)
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Using templates
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---------------
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You may also want to allow your plugin's users to customize the web pages
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without editing the source code of the plugin itself.
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Limnoria provides a template facility, which takes a file name, returns the
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content of a file from the file system if it exists (the user-defined template),
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and a default one otherwise (the developer's default template).
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does not exist.
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In our case, we will do it only for the home page and the error page (which
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are the only 'big' pages), like this::
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DEFAULT_TEMPLATES = {
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'supystory/index.html': """
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<html>
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<head>
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<title>Supystory</title>
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</head>
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<body>
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<h1>Supystory</h1>
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<p>
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Here are some links you can visit:
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<a href="./supybot">Supybot</a>
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<a href="./gribble">Gribble</a>
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<a href="./limnoria">Limnoria</a>
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</p>
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</body>
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</html>""",
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'supystory/error.html': """
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<html>
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<head>
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<title>Error</title>
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</head>
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<body>
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<h1>404 Not found</h1>
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<p>
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The document could not be found. Try one of this links:
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<a href="./supybot">Supybot</a>
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<a href="./gribble">Gribble</a>
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<a href="./limnoria">Limnoria</a>
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</p>
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</body>
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</html>"""
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}
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httpserver.set_default_templates(DEFAULT_TEMPLATES)
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class SupystoryServerCallback(httpserver.SupyHTTPServerCallback):
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name = 'Supystory'
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defaultResponse = """
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This plugin handles only GET request, please don't use other requests."""
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def doGet(self, handler, path):
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if path == '/supybot':
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response = b'Supybot is the best IRC bot ever.'
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elif path == '/gribble':
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response = b'Thanks to Gribble, we have many bug fixes and SQLite 3 support'
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elif path == '/limnoria':
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response = b'Thanks to Limnoria, you can to internationalize your plugins and write a web server.'
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elif path == '' or path == '/':
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handler.send_response(200) # Found
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handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
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handler.end_headers() # We won't send more headers
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handler.wfile.write(response)
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handler.wfile.write(httpserver.get_template('supystory/index.html').encode('utf8'))
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return
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else:
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handler.send_response(404) # Not found
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handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
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handler.end_headers() # We won't send more headers
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handler.wfile.write(httpserver.get_template('supystory/error.html').encode('utf8'))
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return
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handler.send_response(200)
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handler.send_header('Content-type', 'text/plain') # This is the MIME for plain text
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handler.end_headers() # We won't send more headers
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handler.wfile.write(response)
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That's all !
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You may not understand everything (I know I don't speak English very well);
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come on #limnoria at Freenode and ask for help of make suggestions!
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