JabChapter 9
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{{Content Programming Jabber}} | {{Content Programming Jabber}} |
Revision as of 19:48, 3 October 2009
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Groupchat, : Components, and Event Models
By now, you should have a
- good idea of how scripts interact with Jabber and how the core
- elements such as <message/> and
- <presence/> can be constructed and handled.
This chapter builds upon what we've already seen in Chapter 8 and introduces new concepts. We build a nosy assistant that joins a conference room and alerts us to words and phrases that we want it to listen for. There are two popular conference protocols, as mentioned in Section 6.2.6 the presence-based Groupchat protocol, and the jabber:iq:conference-based Conference protocol. The assistant recipe, a foray into the world of 'bots, takes a look at the original presence-based one.
As we've seen, programming within Jabber's event model is fairly straightforward. But what happens when you want to meld other components with event models of their own? We look at a couple of typical scenarios where this melding needs to happen. The first is a homage to the Trojan Room Coffee Machine (http://www.cl.cam.ac.uk/coffee/coffee.html), where we give life, or at least presence, to a coffeepot, using LEGO MINDSTORMS. The second is a Tk-based RSS headline viewer. Both the coffeepot and the Tk programming library have event loops of their own. With the coffeepot, we need to have a loop that polls the coffeepot's status, independently of the polling for incoming packets from the Jabber server. The Tk programming library's event model is similar to those of the Jabber programming libraries that are used in the recipes in this book, in that handlers are set up and a loop is started that listens for UI events. In both cases, we need to get these event loops to work in harmony with the Jabber libraries' event loops.
Building Jabber solutions without event loops is a Sisyphean task. The very nature of Jabber communication is event-based, and it's important to understand how to use the event features of the Jabber programming libraries and also how to be able to mesh those features with similar features in other libraries and systems.
We also look at extending messages and build a mechanism that delivers RSS headlines to clients who register with that mechanism. These headlines are carried using an extended message type. In fact, the RSS Delivery Mechanism is a component. The three recipes in Chapter 8, were Jabber clients, in that they connected to the Jabber network via the Jabber Session Manager (JSM) service. We look at the differences between programming a client and programming a component in this chapter and build a complete component that can be queried and interacted with using the third of Jabber's building blocks the <iq/> element.
Happy coding!
Keyword Assistant
Many of the Jabber core and peripheral
developers hang out in a conference room called jdev hosted by the
Conferencing component on the Jabber server running at jabber.org.
While a lot of useful information is to be gleaned from listening to
what goes on in jdev, it isn't possible to be there all the time.
Conversations in jdev are logged to web pages, which can be used to
visit after the fact to try to catch up with things; however, this can
be a hopeless task. One solution is to build a 'bot that looks for
specific keywords and Uniform Resource Locators (URLs) in the
conversations in jdev and send those on as Jabber messages.
This script, keyassist, connects to a Jabber server, enters a conference room, and listens to the conversations, looking for certain words and phrases to be uttered. The keyassist script is given a bit of "intelligence" in that it can be interacted with and told, while running, to watch for (or stop watching for), certain words and phrases.
The keyassist script introduces us to programmatic interaction with the Conferencing component. Before looking at the script, however, let's have a brief overview of Conferencing in general.
Conferencing
The Conferencing component at jabber.org is
conference.jabber.org. Details of the component instance
configuration for such a Conferencing component can be found in Section
4.10, where we see that the component exists as a shared object library
connected with the library load component connection method. This
component provides general conferencing facilities, oriented around a
conference room and conference user model.
A Jabber user can enter (or join) a conference room, thereby becoming a conference user identified by a nickname that is chosen upon entering that room. Nicknames are generally used in conference rooms to provide a modicum of privacy it is assumed that by default you don't want to let the other conference room members know your real JID.
The Conferencing component supports two protocols for user and room interaction: a simple one that provides basic features and a more complex one that provides the basic features plus facilities such as password-protected rooms and room descriptions Groupchat and Conference.
{{Note|There is a third protocol, called
Experimentaliq:groupchat, which came between the Groupchat
and Conference protocols. This reflected an experimental move to add
features to the basic Groupchat protocol using IQ elements, the contents
of which were qualified by a namespace jabber:iq:groupchat.
This protocol has been dropped, and support for it exists only in
certain versions of WinJab and JIM.
</code>
- Groupchat
- The Groupchat protocol is the simpler of the two and provides basic
- functions for entering and exiting conference rooms and choosing
- nicknames. : This Groupchat protocol is known as the presence-based
- protocol, because the protocol is based upon
- <presence/> elements used for room entry, exit, and
- nickname determination. The Groupchat protocol has a nominal version
- number of 1.0.
- Conference
- The Conference protocol offers more advanced features than the
- Groupchat protocol and makes use of two IQ namespaces:
- jabber:iq:conference and jabber:iq:browse. It has a
- nominal protocol version number of 1.4, which reflects the version of
- the Jabber server with which it is delivered. Sometimes this version
- number is referred to as 0.4, such as in the downloadable tarball and
- in the value returned in response to a "version query" on the
- component itself, as shown in Example 9-1. : The version number isn't
- that important. The main thing to keep in mind is that the component
- that is called conference.so (see the reference to the
- shared object library in Section 4.10.4) supports both the
- Groupchat protocol and the Conference protocol. If you come across a
- shared object library called groupchat.so, this is the
- original Conferencing component that was made available with Jabber
- server Version 1.0. This library supports only the Groupchat protocol.
Querying the Conferencing component's version
SEND: <iq type='get' to='conference.gnu.mine.nu'> <query
xmlns='jabber:iq:version'/> </iq>
RECV: <iq to='dj@gnu.mine.nu/jarl' from='conference.gnu.mine.nu' type='result'> <query xmlns='jabber:iq:version'> <name>conference</name> <version>0.4</version> <os>Linux 2.4.2-2</os> </query> </iq> In this recipe we'll be using the simpler Groupchat protocol. It's widely used and easy to understand. Example 9-2 shows a typical element log from Groupchat-based activity. It shows a user, with the JID qmacro@jabber.com, entering a room called "cellar," hosted on the conference component at conf.merlix.dyndns.org, a room that currently has two other occupants who go by the nicknames flash and roscoe. The elements are from qmacro's perspective, and are all explained following the example.
The Groupchat protocol in action The user qmacro tries to
enter the conference room with the nickname flash and fails:
SEND: <presence to='cellar@conf.merlix.dyndns.org/flash'/>
RECV: <presence to='qmacro@jabber.com/jarltk' from='cellar@conf.merlix.dyndns.org/flash' type='error'> <error code='409'>Conflict</error> </presence>
He tries again, this time with a different nickname, deejay, and is successful:
SEND: <presence to='cellar@conf.merlix.dyndns.org/deejay'/>
RECV: <presence to='qmacro@jabber.com/jarltk' from='cellar@conf.merlix.dyndns.org/flash'/>
RECV: <presence to='qmacro@jabber.com/jarltk' from='cellar@conf.merlix.dyndns.org/roscoe'/>
RECV: <presence to='qmacro@jabber.com/jarltk' from='cellar@conf.merlix.dyndns.org/deejay'/>
RECV: <message to='qmacro@jabber.com/jarltk' type='groupchat' from='cellar@conf.merlix.dyndns.org'> <body>deejay has become available</body> </message>
roscoe says hi, and qmacro waves back:
RECV: <message to='qmacro@jabber.com/jarltk'
from='cellar@conf.merlix.dyndns.org/roscoe' type='groupchat' cnu=>
<body>hi</body> </message>
SEND: <message to='cellar@conf.merlix.dyndns.org' type='groupchat'> <body>/me waves to everyone</body> </message>
flash sends a private message to qmacro:
RECV: <message to='qmacro@jabber.com/jarltk'
from='cellar@conf.merlix.dyndns.org/flash' type='chat'>
<body>Is that you, qmacro?</body>
<thread>jarl1998911094</thread> </message>
Feeling left out of the conversation, roscoe leaves the room:
RECV: <presence to='qmacro@jabber.com/jarltk'
type='unavailable' from='cellar@conf.merlix.dyndns.org/roscoe'/>
RECV: <message to='qmacro@jabber.com/jarltk' type='groupchat' from='cellar@conf.merlix.dyndns.org'> <body>roscoe has left</body> </message> Let's take the stages in Example 9-2 one by one.
- Failed attempt to enter room
- qmacro makes an attempt to enter the room using the Groupchat
- protocol. This is done by sending a directed
- <presence/> element to a particular JID that represents
- the room and the chosen nickname. This JID is constructed as follows:
[room name]@[conference component]/[nickname]
- In this example, the conferencing component is identified with the
- hostname conf.merlix.dyndns.org. qmacro's choice of
- nickname is flash:
cellar@conf.merlix.dyndns.org/flash
- Thus the following element is sent:
SEND: <presence to='cellar@conf.merlix.dyndns.org/flash'/>
- The conference component determines that there is already someone
- present in the room cellar@conf.merlix.dyndns.org with the
- nickname flash, so qmacro is notified of this and
- receives a directed presence with an <error/> tag:
RECV: <presence to='qmacro@jabber.com/jarltk'
from='cellar@conf.merlix.dyndns.org/flash' type='error'> <error
code='409'>Conflict</error> </presence>
- Note that the <presence/> element has the type
- error and comes from the artificial JID constructed in the
- room entry attempt. The element is addressed to qmacro's real
- JID, of courseqmacro@jabber.com/jarltk as otherwise it
- wouldn't reach him. : The error code 409 and text "Conflict" tells
- qmacro that the nickname conflicted with one already in the
- room. This is a standard error code/text pair; Table 5-3 shows a
- complete set of code/text pairs. : At this stage, qmacro is
- not yet in the room.
- Successful attempt to enter room
- qmacro tries again, this time with a different nickname,
- deejay:[1]
SEND: <presence to='cellar@conf.merlix.dyndns.org/deejay'/>
- This time, there is no conflict