mirror of
https://github.com/Mikaela/Limnoria-doc.git
synced 2024-11-23 12:39:35 +01:00
268 lines
11 KiB
ReStructuredText
268 lines
11 KiB
ReStructuredText
********************************************
|
|
Using Limnoria's HTTP server in your plugins
|
|
********************************************
|
|
|
|
Introduction
|
|
============
|
|
|
|
.. note::
|
|
Until stock Supybot or Gribble merge the HTTP server, this documentation
|
|
only applies to Limnoria.
|
|
|
|
Limnoria provides an HTTP server to plugins. This is not relevant for most
|
|
plugins, but some of them have to start a server (either for serving a website
|
|
or for being remotely called).
|
|
The HTTP server provided by Limnoria aims at starting a single server for
|
|
all of them, which means less used port and less resources usage.
|
|
|
|
Some example plugins are `Factoids`_, `WebStats`_, `GitHub`_, UfrPaste, and
|
|
`WebDoc`_
|
|
|
|
.. _Factoids: https://github.com/ProgVal/Limnoria/tree/master/plugins/Factoids
|
|
.. _WebStats: https://github.com/ProgVal/Limnoria/tree/master/plugins/WebStats
|
|
.. _GitHub: https://github.com/ProgVal/Limnoria/tree/master/plugins/GitHub
|
|
.. _WebDoc: https://github.com/ProgVal/Limnoria/tree/master/plugins/WebDoc
|
|
|
|
|
|
Using the HTTP server in a plugin
|
|
=================================
|
|
|
|
Let's try to make a basic dictionary about Supybot! We'll call it Supystory.
|
|
|
|
We want to get plain text information about Supybot, Gribble, and Limnoria when
|
|
accessing http://localhost:8080/supystory/supybot,
|
|
http://localhost:8080/supystory/gribble, and
|
|
http://localhost:8080/supystory/limnoria, an index page, and an HTML error page
|
|
if the page is not found
|
|
|
|
Importing the HTTP server
|
|
-------------------------
|
|
|
|
On only have to add this line::
|
|
|
|
import supybot.httpserver as httpserver.
|
|
|
|
Creating a callback
|
|
-------------------
|
|
|
|
If you are familiar with `BaseHTTPServer`, you will recognize the design,
|
|
except you don't need to subclass BaseHTTPServer, because I already did
|
|
it in *supybot.httpserver*.
|
|
|
|
Now, you have to subclass `httpserver.SupyHTTPServerCallback`. A callback is
|
|
pretty much like an handler, but this is not an handler, because a callback is
|
|
called by the handler.
|
|
|
|
Here is how to do it::
|
|
|
|
class SupystoryServerCallback(httpserver.SupyHTTPServerCallback):
|
|
name = 'WebStats'
|
|
|
|
Now, you have to register the callback, because the HTTP server does not know
|
|
what subdirectory it should assign to your callback. Do it with adding a
|
|
*__init__* to your plugin (read Supybot's docs about it, for more
|
|
informations)::
|
|
|
|
class Supystory(callbacks.Plugin):
|
|
def __init__(self, irc):
|
|
# Some stuff needed by Supybot
|
|
self.__parent = super(Supystory, self)
|
|
callbacks.Plugin.__init__(self, irc)
|
|
|
|
# registering the callback
|
|
callback = SupystoryServerCallback() # create an instance of the callback
|
|
httpserver.hook('supystory', callback) # register the callback at `/supystory`
|
|
|
|
By the way, don't forget to unhook your callback when unloading your plugin,
|
|
unless what it will be impossible to reload the plugin! Append this code to
|
|
the following::
|
|
|
|
def die(self):
|
|
# unregister the callback
|
|
httpserver.unhook('supystory') # unregister the callback hooked at /supystory
|
|
|
|
# Stuff for Supybot
|
|
self.__parent.die()
|
|
|
|
Now, you can load your plugin, and you'll see on the server a beautiful link
|
|
to `/supystory` called `Supystory`.
|
|
|
|
Overriding the default error message
|
|
------------------------------------
|
|
|
|
But our plugin does not do anything for the moment. If click the link, you'll
|
|
get this message::
|
|
|
|
This is a default response of the Supybot HTTP server. If you see this
|
|
message, it probably means you are developping a plugin, and you have
|
|
neither overriden this message or defined an handler for this query.
|
|
|
|
That mean your browser sent a GET request, but you didn't teach your plugin how
|
|
to handle it. First, we'll change this error message.
|
|
Here is a new code for your callback::
|
|
|
|
class SupystoryServerCallback(httpserver.SupyHTTPServerCallback):
|
|
name = 'Supystory'
|
|
defaultResponse = """
|
|
This plugin handles only GET request, please don't use other requests."""
|
|
|
|
Now, you'll get your customized message. But your plugin still doesn't work.
|
|
You need to implement the GET request.
|
|
|
|
Implementing the GET request
|
|
----------------------------
|
|
|
|
As I said before, callbacks are pretty much like handlers. In order to handle
|
|
GET requests, you have to implement a method called... `doGet` (if you used
|
|
BaseHTTPServer, you will notice this is not do_GET, because doGet is more
|
|
homogeneous with Supybot naming style: `doPrivmsg`, `doPing`, and so on).
|
|
|
|
You will get the handler and the URI as arguments. The handler is a
|
|
`BaseHTTPRequestHandler`_, and the URI is a string.
|
|
|
|
.. _BaseHTTPRequestHandler: http://docs.python.org/library/basehttpserver.html#BaseHTTPServer.BaseHTTPRequestHandler
|
|
|
|
Here is the code of the callback... pretty much simple, as ever::
|
|
|
|
class SupystoryServerCallback(httpserver.SupyHTTPServerCallback):
|
|
name = 'Supystory'
|
|
defaultResponse = """
|
|
This plugin handles only GET request, please don't use other requests."""
|
|
|
|
def doGet(self, handler, path):
|
|
if path == '/supybot':
|
|
response = b'Supybot is the best IRC bot ever.'
|
|
elif path == '/gribble':
|
|
response = b'Thanks to Gribble, we have many bug fixes and SQLite 3 support'
|
|
elif path == '/limnoria':
|
|
response = b'Thanks to Limnoria, you can to internationalize your plugins and write a web server.'
|
|
elif path == '' or path == '/':
|
|
handler.send_response(200) # Found
|
|
handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(b"""
|
|
<html>
|
|
<head>
|
|
<title>Supystory</title>
|
|
</head>
|
|
<body>
|
|
<h1>Supystory</h1>
|
|
<p>
|
|
Here are some links you can visit:
|
|
<a href="./supybot">Supybot</a>
|
|
<a href="./gribble">Gribble</a>
|
|
<a href="./limnoria">Limnoria</a>
|
|
</p>
|
|
</body>
|
|
</html>""")
|
|
return
|
|
else:
|
|
handler.send_response(404) # Not found
|
|
handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(b"""
|
|
<html>
|
|
<head>
|
|
<title>Error</title>
|
|
</head>
|
|
<body>
|
|
<h1>404 Not found</h1>
|
|
<p>
|
|
The document could not be found. Try one of this links:
|
|
<a href="./supybot">Supybot</a>
|
|
<a href="./gribble">Gribble</a>
|
|
<a href="./limnoria">Limnoria</a>
|
|
</p>
|
|
</body>
|
|
</html>""")
|
|
return
|
|
handler.send_response(200)
|
|
handler.send_header('Content-type', 'text/plain') # This is the MIME for plain text
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(response)
|
|
|
|
|
|
Using templates
|
|
---------------
|
|
|
|
You may also want to allow your plugin's users to customize the web pages
|
|
without editing the source code of the plugin itself.
|
|
|
|
Limnoria provides a template facility, which takes a file name, returns the
|
|
content of a file from the file system if it exists (the user-defined template),
|
|
and a default one otherwise (the developer's default template).
|
|
does not exist.
|
|
|
|
In our case, we will do it only for the home page and the error page (which
|
|
are the only 'big' pages), like this::
|
|
|
|
DEFAULT_TEMPLATES = {
|
|
'supystory/index.html': """
|
|
<html>
|
|
<head>
|
|
<title>Supystory</title>
|
|
</head>
|
|
<body>
|
|
<h1>Supystory</h1>
|
|
<p>
|
|
Here are some links you can visit:
|
|
<a href="./supybot">Supybot</a>
|
|
<a href="./gribble">Gribble</a>
|
|
<a href="./limnoria">Limnoria</a>
|
|
</p>
|
|
</body>
|
|
</html>""",
|
|
'supystory/error.html': """
|
|
<html>
|
|
<head>
|
|
<title>Error</title>
|
|
</head>
|
|
<body>
|
|
<h1>404 Not found</h1>
|
|
<p>
|
|
The document could not be found. Try one of this links:
|
|
<a href="./supybot">Supybot</a>
|
|
<a href="./gribble">Gribble</a>
|
|
<a href="./limnoria">Limnoria</a>
|
|
</p>
|
|
</body>
|
|
</html>"""
|
|
}
|
|
|
|
httpserver.set_default_templates(DEFAULT_TEMPLATES)
|
|
|
|
|
|
|
|
class SupystoryServerCallback(httpserver.SupyHTTPServerCallback):
|
|
name = 'Supystory'
|
|
defaultResponse = """
|
|
This plugin handles only GET request, please don't use other requests."""
|
|
|
|
def doGet(self, handler, path):
|
|
if path == '/supybot':
|
|
response = b'Supybot is the best IRC bot ever.'
|
|
elif path == '/gribble':
|
|
response = b'Thanks to Gribble, we have many bug fixes and SQLite 3 support'
|
|
elif path == '/limnoria':
|
|
response = b'Thanks to Limnoria, you can to internationalize your plugins and write a web server.'
|
|
elif path == '' or path == '/':
|
|
handler.send_response(200) # Found
|
|
handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(httpserver.get_template('supystory/index.html').encode('utf8'))
|
|
return
|
|
else:
|
|
handler.send_response(404) # Not found
|
|
handler.send_header('Content-type', 'text/html') # This is the MIME for HTML data
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(httpserver.get_template('supystory/error.html').encode('utf8'))
|
|
return
|
|
handler.send_response(200)
|
|
handler.send_header('Content-type', 'text/plain') # This is the MIME for plain text
|
|
handler.end_headers() # We won't send more headers
|
|
handler.wfile.write(response)
|
|
|
|
Then, the user can change the template by copying
|
|
`data/web/supystory/index.html.example` to
|
|
`data/web/supystory/index.html` and editing it. (Same for `error.html`.)
|