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interfaces.sgml
<!DOCTYPE article SYSTEM "supybot.dtd">
<article>
<articleinfo>
<authorgroup>
<author>
<firstname>Jeremiah</firstname>
<surname>Fincher</surname>
</author>
<editor>
<firstname>Daniel</firstname>
<surname>DiPaolo</surname>
<contrib>DocBook translator</contrib>
</editor>
</authorgroup>
<title>Supybot developer interfaces</title>
<revhistory>
<revision>
<revnumber>0.1</revnumber>
<date>19 Feb 2004</date>
<revremark>Initial Docbook translation</revremark>
</revision>
<revision>
<revnumber>0.2</revnumber>
<date>26 Feb 2004</date>
<revremark>Converted to Supybot DTD</revremark>
</revision>
</revhistory>
</articleinfo>
<sect1>
<title>Available interfaces</title>
<para>
These are the interfaces for some of the objects you'll deal with
if you code for Supybot.
</para>
<sect2>
<title><classname>ircmsgs.IrcMsg</classname>
<para>
This is the object that represents an IRC message. It has
several methods and attributes. The most important thing
about this class, however, is that it <emphasis>is</emphasis>
hashable, and thus <emphasis>cannot</emphasis> be modified.
Do not change any attributes; any code that modifies an IRC
message is <emphasis>broken</emphasis> and should not exist.
</para>
<variablelist>
<title>Interesting methods</title>
<varlistentry>
<term>__init__</term>
<listitem>
<para>
One of the more complex initializers in a class.
It can be used in three different ways:
</para>
<orderedlist numeration="arabic" spacing="normal">
<listitem>
<para>
It can be given a string, as one received
from the server, which it will then parse
into its separate components and
instantiate the class with those
components as attributes.
</para>
</listitem>
<listitem>
<para>
It can be given a command, some (optional)
arguments, and a (optional) prefix, and
will instantiate the class with those
components as attributes.
</para>
</listitem>
<listitem>
<para>
It can be given, in addition to any of the
above arguments, a <varname>msg</varname>
keyword argument that will use the
attributes of msg as defaults. This
exists to make it easier to copy messages,
since the class is immutable.
</para>
</listitem>
</orderedlist>
</listitem>
</varlistentry>
<varlistentry>
<term>__str__</term>
<listitem>
<para>
This returns the message in a string form suitable
for sending to a server.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>__repr__</term>
<listitem>
<para>
This returns the message in a form suitable for
<function>eval()</function>, assuming the name
<varname>IrcMsg</varname> is in your namespace and
is bound to this class.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
The following attributes are the meat of this class. These
are generally what you'll be looking at with
<varname>IrcMsg</varname>s.
</para>
<variablelist>
<title>Interesting attributes</title>
<varlistentry>
<term>command</term>
<listitem>
<para>
This is the command of the
<varname>IrcMsg</varname> –
<literal>PRIVMSG</literal>,
<literal>NOTICE</literal>,
<literal>WHOIS</literal>,
etc.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>args</term>
<listitem>
<para>
This is a tuple of the arguments to the
<varname>IrcMsg</varname>. Some messages have
arguments, some don't, depending on what command
they are. You are, of course, always assured that
<varname>args</varname> exists and is a tuple,
though it might be empty.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>prefix</term>
<listitem>
<para>
This is the hostmask of the person/server the
message is from. In general, you won't be setting
this on your outgoing messages, but incoming
messages will always have one. This is the whole
hostmask; if the message was received from a
server, it'll be the server's hostmask; if the
message was received from a user, it'll be the
whole user hostmask. In that case, however, it's
also parsed out into the
<varname>nick</varname>/<varname>user</varname>/<varname>host</varname>
attributes, which are probably more useful to
check for many purposes.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>nick</term>
<listitem>
<para>
If the message was sent by a user, this will be
the nick of the user. If it was sent by a server,
this will be the server's name (something like
<literal>calvino.freenode.net</literal> or
similar).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>user</term>
<listitem>
<para>
If the message was sent by a user, this will be
the user string of the user – what they put
into their IRC client for their "full name." If
it was sent by a server, it'll be the server's
name, again.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>host</term>
<listitem>
<para>
If the message was sent by a user, this will be
the host portion of their hostmask. If it was
sent by a server, it'll be the server's name (yet
again :))
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2>
<title><classname>irclib.Irc</classname>
<para>
This is the object to handle everything about IRC except the
actual connection to the server itself.
(<emphasis>NOTE</emphasis> that the object actually received
by commands in subclasses of
<classname>callbacks.Privmsg</classname> is an
<classname>IrcObjectProxy</classname>, which is described
later. It augments the following interface with several
methods of its own to help plugin authors.)
</para>
<variablelist>
<title>Interesting methods</title>
<varlistentry>
<term>queueMsg</term>
<listitem>
<para>
Queues a message for sending to the server. The
queue is generally FIFO, but it does prioritize
messages based on their command.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>sendMsg</term>
<listitem>
<para>
Queues a message for sending to the server prior
to any messages in the normal queue. This is
exactly a FIFO queue, no reordering is done at
all.
</para>
</listitem>
</varlistentry>
<!--<note>
<para>
The following two methods are the most important for
people writing new <varname>IrcDriver</varname>s.
Otherwise, you really don't need to pay attention to
them.
</para>
</note>-->
<varlistentry>
<term>feedMsg</term>
<listitem>
<para>
Feeds the <varname>Irc</varname> object a message
for it handle appropriately, as well as passing it
on to callbacks.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>takeMsg</term>
<listitem>
<para>
If the <varname>Irc</varname> object has a message
it's ready to send to the server, this will return
it. Otherwise, it will return
<literal>None</literal>.
</para>
</listitem>
</varlistentry>
<!--<note>
<para>
The next several methods are of far more marginal
utility. But someone may need them, so they're
documented here.
</para>
</note>-->
<varlistentry>
<term>addCallback</term>
<listitem>
<para>
Takes a callback to add to the list of callbacks
in the <varname>Irc</varname> object. See the
interface for <varname>IrcCallback</varname> for
more information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>getCallback</term>
<listitem>
<para>
Gets a callback by name, if it is in the
<varname>Irc</varname> object's list of callbacks.
If it it isn't, returns <literal>None</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>removeCallback</term>
<listitem>
<para>
Removes a callback by name. Returns a list of the
callbacks removed (since it is technically
possible to have multiple callbacks with the same
name. This list may be empty.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>__init__</term>
<listitem>
<para>
Requires a <varname>nick</varname>. Optional
arguments include <varname>user</varname> and
<varname>ident</varname>, which default to the
nick given, <varname>password</varname>, which
defaults to the empty password, and
<varname>callbacks</varname>, a list of callbacks
(which defaults to nothing, an empty list).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>reset</term>
<listitem>
<para>
Resets the <varname>Irc</varname> object to its
original state, as well as sends a
<function>reset()</function> to every callbacks.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>die</term>
<listitem>
<para>
Kills the IRC object and all its callbacks.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist>
<title>Interesting attributes</title>
<varlistentry>
<term>nick</term>
<listitem>
<para>
The current nick of the bot.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>prefix</term>
<listitem>
<para>
The current prefix of the bot.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>server</term>
<listitem>
<para>
The current server the bot is connected to.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>network</term>
<listitem>
<para>
The current network name the bot is connected to.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>afterConnect</term>
<listitem>
<para>
<literal>False</literal> until the bot has
received a command sent after the connection is
finished – 376, 377, or 422.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>state</term>
<listitem>
<para>
An <varname>IrcState</varname> object for this
particular connection. See the interface for the
<varname>IrcState</varname> object for more
information.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2>
<title><classname>irclib.IrcCallback</classname></title>
<variablelist>
<title>Interesting Methods</title>
<varlistentry>
<term>name</term>
<listitem>
<para>
Returns the name of the callback. The default
implementation simply returns the name of the
class.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>__call__</term>
<listitem>
<para>
Called by the <varname>Irc</varname> object with
itself and the message whenever a message is fed
to the <varname>Irc</varname> object. Nothing is
done with the return value.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>inFilter</term>
<listitem>
<para>
Called by the <varname>Irc</varname> object with
itself and the message whenever a message is fed
to the <varname>Irc</varname> object. The return
value should be an <varname>IrcMsg</varname>
object to be passed to the next callback in the
<varname>Irc</varname>'s list of callbacks. If
<literal>None</literal> is returned, all
processing stops. This gives callbacks an
oppurtunity to "filter" incoming messages before
general callbacks are given them.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>outFilter</term>
<listitem>
<para>
Basically equivalent to
<varname>inFilter</varname>, except instead of
being called on messages as they enter the
<varname>Irc</varname> object, it's called on
messages as they leave the <varname>Irc</varname>
object.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>die</term>
<listitem>
<para>
Called when the parent <varname>Irc</varname> is
told to die. This gives callbacks an oppurtunity
to close open files, network connections, or
databases before they're deleted.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>reset</term>
<listitem>
<para>
Called when the parent <varname>Irc</varname> is
told to reset (which is generally when
reconnecting to the server). Most callbacks don't
need to define this.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist>
<title>Interesting attributes</title>
<varlistentry>
<term>priority</term>
<listitem>
<para>
Determines the priority of the callback in the
<varname>Irc</varname> object's list of callbacks.
Defaults to <literal>99</literal>; the valid range
includes <literal>0</literal> through
<literal>sys.maxint-1</literal> (don't use
<literal>sys.maxint</literal> itself, that's
reserved for the <varname>Misc</varname> plugin).
The lower the number, the higher the priority.
High priority callbacks are called earlier in the
<varname>inFilter</varname> cycle, earlier in the
<varname>__call__</varname> cycle, and later in
the <varname>outFilter</varname> cycle –
basically, they're given the first chances on the
way in and the last chances on the way out.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2>
<title><classname>callbacks.IrcObjectProxy</classname></title>
<para>
<classname>IrcObjectProxy</classname> is a proxy for an
<classname>irclib.Irc</classname> instance that serves to
provide a much fuller interface for handling replies and
errors as well as to handle the nesting of commands. This is
what you'll be dealing with almost all the time when writing
commands; when writing <function>doCommand</function> methods
(the kind you read about in the interface description of
<classname>irclib.IrcCallback</classname>) you'll be dealing
with plain old <classname>irclib.Irc</classname> objects.
</para>
<variablelist>
<title>Interesting methods</title>
<varlistentry>
<term>reply</term>
<listitem>
<para>
Called to reply to the current message with a
string that is to be the reply. Uses the
<function>queueMsg</function> command discussed in
the <classname>irclib.Irc</classname> section.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>replySuccess</term>
<term>replyError</term>
<listitem>
<para>
These reply with the configured responses for
success and generic error, respectively. If an
additional argument is given, it's (intelligently)
appended to the generic message to be more
specific.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>error</term>
<listitem>
<para>
Called to send an error reply to the current
message; not only does the response indicate an
error, but commands that error out break the
nested-command chain, which is generally useful
for not confusing the user :)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>errorNoCapability</term>
<listitem>
<para>
Like <function>error</function>, except it accepts
the capability that's missing and integrates it
into the configured error message for such things.
Also accepts an additional string for a more
descriptive message, if that's what you want.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>errorPossibleBug</term>
<term>errorNotRegistered</term>
<term>errorNoUser</term>
<term>errorRequiresPrivacy</term>
<listitem>
<para>
These methods reply with the appropriate
configured error message for the conditions in
their names; they all take an additional arguments
to be more specific about the conditions they
indicate, but this argument is very rarely
necessary.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>getRealIrc</term>
<listitem>
<para>
Returns the actual <classname>Irc</classname>
object being proxied for.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
</article>
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