Accessgrid XMPP rationale
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This document discusses problems with the current AccessGrid architecture and proposes adopting the XMPP protocol as a replacement. Key points include: - The current AccessGrid is based on Globus which is complex, heavyweight, and has usability issues. - XMPP (Jabber) is proposed as a replacement as it is an open standard for instant messaging with support for features like file sharing, chat rooms, and publishing data that could meet AccessGrid's needs. - The initial plan is for AccessGrid rooms to be implemented as XMPP chat rooms with a moderator publishing multicast info, and applications able to share data through the rooms. - Adopting XMPP would avoid having to write new servers
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![What to do?
AccessGrid and
stu?
Steve Smith
¡°Don¡¯t patch bad code - rewrite it.¡± ¨C Kernighan and
Plauger
¡°[Mozilla made] the single worst strategic mistake that
any software company can make: They decided to
rewrite the code from scratch.¡± ¨C Joel Spolsky](https://image.slidesharecdn.com/jabber-misc-131118084130-phpapp01/85/Accessgrid-XMPP-rationale-7-320.jpg)
![What to do?
AccessGrid and
stu?
Steve Smith
¡°Don¡¯t patch bad code - rewrite it.¡± ¨C Kernighan and
Plauger
¡°[Mozilla made] the single worst strategic mistake that
any software company can make: They decided to
rewrite the code from scratch.¡± ¨C Joel Spolsky
Steve¡¯s corollary: ¡°Fix bad code, replace bad
architectures.¡±](https://image.slidesharecdn.com/jabber-misc-131118084130-phpapp01/85/Accessgrid-XMPP-rationale-8-320.jpg)
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Accessgrid XMPP rationale
- 1. AccessGrid and stu? Steve Smith AccessGrid and stu? Steve Smith Vislab, School of IT University of Sydney 2nd June 2005
- 2. Topics AccessGrid and stu? Steve Smith AccessGrid, Globus, Jabber, XMPP, XML, Multicast
- 3. Topics AccessGrid and stu? Steve Smith AccessGrid, Globus, Jabber, XMPP, XML, Multicast Python, Twisted, Bittorrent, Bencode, Erlang, Lisp, Latex
- 4. Topics AccessGrid and stu? Steve Smith AccessGrid, Globus, Jabber, XMPP, XML, Multicast Python, Twisted, Bittorrent, Bencode, Erlang, Lisp, Latex In no particular order.
- 6. Problems with the AG AccessGrid and stu? Steve Smith Globus is complex, heavyweight, slow Disconnected operation based on transient connections (WS) Not really a standard or a protocol Authentication sucks on many levels. Vic and Rat have major usability problems
- 7. What to do? AccessGrid and stu? Steve Smith ¡°Don¡¯t patch bad code - rewrite it.¡± ¨C Kernighan and Plauger ¡°[Mozilla made] the single worst strategic mistake that any software company can make: They decided to rewrite the code from scratch.¡± ¨C Joel Spolsky
- 8. What to do? AccessGrid and stu? Steve Smith ¡°Don¡¯t patch bad code - rewrite it.¡± ¨C Kernighan and Plauger ¡°[Mozilla made] the single worst strategic mistake that any software company can make: They decided to rewrite the code from scratch.¡± ¨C Joel Spolsky Steve¡¯s corollary: ¡°Fix bad code, replace bad architectures.¡±
- 9. Pass 1: DIY AccessGrid and stu? Steve Smith Uses Twisted to build simple client/server. Protocol is line-oriented, based on Bittorrent encoding (¡°bencoding¡±). Can send, strings, integers, hashes, lists. Can support AG-style PKI certi?cate authentication (¡¯STARTTLS¡¯). Not really the solution, more to make a point about complexity.
- 10. The real solution: XMPP AccessGrid and stu? Steve Smith Otherwise known as Jabber. XML based protocol (yeah, I know). Recently made IETF standard for IM. Already being used to build shared apps
- 11. Notable (proposed) features AccessGrid and stu? Steve Smith JEPs: Proposed enhancements, like RFCs, PEPs, etc. PubSub: Observer pattern protocol. Multi-user chat rooms (already being used on the AG), moderator system provides access-control. File-transfer, and advertising of ?les. Events, data-forms. Can be pushed through room.
- 12. The (initial) plan AccessGrid and stu? Steve Smith AG rooms are just chat-rooms with special AG user as moderator. Moderator publishes multicast info in Pub/Sub node. AG user can be a bot, interface to booking system to lock rooms. Shared-apps can publish pubsub nodes or send forms through room.
- 13. The (initial) plan AccessGrid and stu? Steve Smith AG rooms are just chat-rooms with special AG user as moderator. Moderator publishes multicast info in Pub/Sub node. AG user can be a bot, interface to booking system to lock rooms. Shared-apps can publish pubsub nodes or send forms through room. Big win: We don¡¯t have to write a server, just use and existing one that support the right JEPs. ejabberd currently best. Written in Erlang, which has some interesting properties.
- 14. The (initial) plan AccessGrid and stu? Steve Smith AG rooms are just chat-rooms with special AG user as moderator. Moderator publishes multicast info in Pub/Sub node. AG user can be a bot, interface to booking system to lock rooms. Shared-apps can publish pubsub nodes or send forms through room. Big win: We don¡¯t have to write a server, just use and existing one that support the right JEPs. ejabberd currently best. Written in Erlang, which has some interesting properties. Will probably still have to write client; probably a good thing. Build agents/bots anyway
- 15. Status AccessGrid and stu? Steve Smith Finish paper, continue working on implementation tests. Like to have something working for APAC, may be Linux-centered for now. Authentication needs more thought, probably PGP web-of-trust based.
- 16. Status AccessGrid and stu? Steve Smith Finish paper, continue working on implementation tests. Like to have something working for APAC, may be Linux-centered for now. Authentication needs more thought, probably PGP web-of-trust based. Should be many student project, internships from this. Big challenge is Vic and Rat.