CouchApps: Requiem for Accidental Complexity
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Talk i gave at Nosqlday with Giordano Scalzo on March 25th 2011. It's about how CouchDB can replace a full serverside mvc stack making development of simple web apps a piece of cake Also http://federico.galassi.net/ http://www.nosqlday.it/ http://couchdb.apache.org/ Follow me on Twitter! https://twitter.com/federicogalassi
![A document DB
{
"company": "CleanCode",
"members": [
{ "name": "Gabriele Lana", "role": "software craftsman"},
{ "name": "Federico Galassi", "role": "software craftsman"},
{ "name": "Giordano Scalzo", "role": "software craftsman"}
]
}](https://image.slidesharecdn.com/couchappsrequiemforaccidentalcomplexity-110327060107-phpapp01/85/CouchApps-Requiem-for-Accidental-Complexity-50-320.jpg)
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CouchApps: Requiem for Accidental Complexity
- 1. CouchApps: Requiem for Accidental Complexity Federico Galassi Giordano Scalzo
- 2. We have a problem...
- 3. Writing software is really hard...
- 4. A little bit of history
- 6. A little bit better
- 8. A different way of programming
- 9. Two tiers architecture Business Logic + Data Presentation
- 10. Three tiers architecture Presentation Business Logic Data
- 11. Tim Berners Lee invented the world wide web
- 12. Three tiers internet style View + Model Controller Thin client
- 13. Evolution of MVC Web App
- 14. Browser is a thin client
- 15. Talking to a smart server
- 16. It all starts with an HTTP request GET / HTTP/1.1 Host: example.org
- 18. Web server parses it Controller
- 19. Dispatch to front controller Controller
- 20. Routing Controller
- 21. Custom action Controller
- 23. Query on model objects Model
- 24. ORM fits into SQL Model
- 25. Hits a RDBMS Model
- 26. Populates a View
- 27. Template engine View
- 28. HTML back to the server View
- 29. HTML back to the client HTTP/1.1 200 OK
- 30. That’s MVC Model View Controller
- 31. A little bit old school
- 32. We love AJAX speed
- 33. Just need an API Model View Json View Controller Api Action
- 34. And some javascript on client Model View Json View Javascript View Controller Api Action
- 35. Nice one ring to rule ‘em all
- 38. Every change touches the server
- 39. Hard to scale We must add another serveeeeerrrr
- 40. Last technology cycle WE WERE HERE MVC peak of inflated expectation Visibility productivity disillusionment obsolescence technology trigger maturity
- 41. Last technology cycle peak of inflated expectation NOW HERE Visibility productivity disillusionment obsolescence technology trigger maturity
- 42. Last technology cycle peak of inflated expectation IF YOU’RE Visibility AT THIS CONF productivity YOU MAY BE ALREADY HERE disillusionment obsolescence technology trigger maturity
- 43. Next technology to save us? ? Visibility maturity
- 44. It’s a cycle but we know one thing ... Visibility maturity
- 45. Specialization is Good
- 48. Very opinionated document DB
- 49. Very good for some problems
- 50. A document DB { "company": "CleanCode", "members": [ { "name": "Gabriele Lana", "role": "software craftsman"}, { "name": "Federico Galassi", "role": "software craftsman"}, { "name": "Giordano Scalzo", "role": "software craftsman"} ] }
- 51. Self contained data INS J O NO
- 52. Schema-less data DATA YO UR VO LVE E
- 53. Incremental Reduce: sum(checkouts) Map/Reduce 430 Re-reduce 142 288 Reduce 100 42 215 73 { { { { Map "id": 1, "day": 20100123, "checkout": 100 "id": 2, "day": 20100123, "checkout": 42 "id": 3, "day": 20100123, "checkout": 215 "id": 4, "day": 20100123, "checkout": 73 } } } }
- 55. Crash-only architecture lucky by design
- 56. A distributed DB
- 59. Automatic conflict resolution
- 60. Built of the Web “Django may be built for the Web, but CouchDB is built of the Web. I’ve never seen software that so Jacob Kaplan-Moss completely embraces the Co-creator of Django philosophies behind HTTP.”
- 61. Restful API GET / Returns MOTD GET /_all_dbs List of databases POST /_restart Restart the server GET /_log Tail of the server’s log GET /_config Entire server config GET /_config/<section>/<key> Single config value PUT /_config/<section>/<key> Set a single config value GET /<db> Database info PUT /<db> Create new database DELETE /<db> Delete database GET /<db>/<doc> Latest revision of the document PUT /<db>/<doc> Insert a new revision of the document ... and everything else
- 62. Javascript to program // MAP function(doc) { if(doc.date && doc.title) { emit(doc.date, doc.title); } }
- 63. JSON to exchange data { "_id":"hello-‐world", "_rev":"43FBA4E7AB", "title":"Hello World", "body":"Well hello and welcome to my new blog...", "date":"2009/01/15 15:52:20" }
- 64. Applications are documents
- 65. Replication as deploy
- 66. A modern web application server
- 67. CouchApps are javascript and html5 applications served directly from CouchDB
- 68. Problem Model View Json View Javascript View Controller Api Action
- 69. Simple Solution HTTP Javascript View
- 70. Experiment: 5 minutes comet chat
- 72. Generate the app
- 74. Deploy the app
- 75. That’s it
- 76. That’s it
- 77. User can post a message Add form elements
- 78. User can post a message On click POST message to couch
- 79. User can post a message Yes!
- 80. User gets a stream of messages Add messages container
- 81. User gets a stream of messages
- 82. User gets a stream of messages Yes!
- 83. Validation?
- 84. Authentication?
- 88. Authentication? If it goes wrong
- 89. Authentication? Check sender is the authenticated user
- 90. Authentication? { sender: “whitehouse” } // spoofing
- 91. Authentication? Yes!
- 92. BASIC HTTP ????? No SSL Yes cookie auth via _session api
- 93. UGLY URLS ????? Rewrites and Virtual hosts
- 94. Easy eh?
- 95. But it’s not that ring
- 96. Very good for CRUD/small/simple web
- 98. [email protected] [email protected] twitter.com/federicogalassi twitter.com/giordanoscalzo slideshare.net/fgalassi slideshare.net/giordano