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COMET in Plone

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Christian Scholz
Christian Scholz

COMET is an upcoming method for delivering real-time interaction to a website by using server-push technologies. At the Snow Sprint 2008 Jean-Nicolas Bes and Ramon Bartl worked on making COMET work for the Open Source CMS Plone. This is their presentation from the final sprint summary.

Technology
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Bringing Comet to Plone KSS + Eventpush A first quick and dirty approach dr_jnut & ramonski http://plone.org
• „Comet is a giant Hack“ - Jacob Rus • use mechanisms unforseen by browser Vendors and unspecified by web standards
Traditional Web Applications • Page-by-page web • Pages load on user request • No real time
AJAX Web Application • Updating parts of the page with JS • Closes each connection after a response is served • No real time
Ajax with polling • Browser polls regulary the server for updates. • Wastes server resources and bandwith. • No real real time • Trade-off between latency and server load
Comet Web Application • Sending data to the client without explicit request • Rely on persistent connection between server and client • REAL real time!!!
2 Strategies • Streaming - Single persistent connection • Long Polling - New request for each event - No response until an event occurs
„Forever Frame“ IFrame streaming approach • Gradually filled with script tags to be executed in the browser • Rendered incrementally, so each script tag is executed as it is received. • Can grow to an unreasonable size...
eventPush ClientSide HttpWizard Zope/Plone HTTP proxy eventPush iFrame /@@feeder
HttpWizard internals Proxy (rewrites URI) VirtualHost www.plone.org Backend Frontend eventPush VirtualHost www.plone.net
eventPush fileupload ClientSide HttpWizard Zope/Plone Upload iframe HTTP proxy eventPush iFrame /@@feeder
File upload in HttpWizard FileUpload hook 4. 3. 4. Proxy 2. (rewrites URI) 5. VirtualHost 1. www.plone.org Backend Frontend eventPush VirtualHost www.plone.net
DEMO Time
How will this evolve? • HTML 5 draft from WHATWG * • Introduces server-sent events • Much more straightforward • Avoids comet downsides * Web Hypertext Application Technology Working Group
Links • http://plone.org • Buildout: https://svn.plone.org/svn/collective/ plonekss/eventPush/buildout/trunk
Thanks to... • KSS guys (__gotcha, ree et al.) • Lovely systems • Berggasthof Piz-Buin • idSoftware (Q3 Rocketarena) • beer in all variants

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COMET in Plone

  • 1. Bringing Comet to Plone KSS + Eventpush A first quick and dirty approach dr_jnut & ramonski http://plone.org
  • 2. • „Comet is a giant Hack“ - Jacob Rus • use mechanisms unforseen by browser Vendors and unspecified by web standards
  • 3. Traditional Web Applications • Page-by-page web • Pages load on user request • No real time
  • 4. AJAX Web Application • Updating parts of the page with JS • Closes each connection after a response is served • No real time
  • 5. Ajax with polling • Browser polls regulary the server for updates. • Wastes server resources and bandwith. • No real real time • Trade-off between latency and server load
  • 6. Comet Web Application • Sending data to the client without explicit request • Rely on persistent connection between server and client • REAL real time!!!
  • 7. 2 Strategies • Streaming - Single persistent connection • Long Polling - New request for each event - No response until an event occurs
  • 8. „Forever Frame“ IFrame streaming approach • Gradually filled with script tags to be executed in the browser • Rendered incrementally, so each script tag is executed as it is received. • Can grow to an unreasonable size...
  • 9. eventPush ClientSide HttpWizard Zope/Plone HTTP proxy eventPush iFrame /@@feeder
  • 10. HttpWizard internals Proxy (rewrites URI) VirtualHost www.plone.org Backend Frontend eventPush VirtualHost www.plone.net
  • 11. eventPush fileupload ClientSide HttpWizard Zope/Plone Upload iframe HTTP proxy eventPush iFrame /@@feeder
  • 12. File upload in HttpWizard FileUpload hook 4. 3. 4. Proxy 2. (rewrites URI) 5. VirtualHost 1. www.plone.org Backend Frontend eventPush VirtualHost www.plone.net
  • 14. How will this evolve? • HTML 5 draft from WHATWG * • Introduces server-sent events • Much more straightforward • Avoids comet downsides * Web Hypertext Application Technology Working Group
  • 15. Links • http://plone.org • Buildout: https://svn.plone.org/svn/collective/ plonekss/eventPush/buildout/trunk
  • 16. Thanks to... • KSS guys (__gotcha, ree et al.) • Lovely systems • Berggasthof Piz-Buin • idSoftware (Q3 Rocketarena) • beer in all variants