Yarn- Working with Messages in Diverse Formats and Protocols.notes
Friday, March 25, 2005
TITLE OF PAPER: Yarn: Working with Messages in Diverse Formats and Protocols
URL OF PRESENTATION: _URL_of_powerpoint_presentation_
PRESENTED BY: Abe Fetting
REPRESENTING: _name_of_the_company_they_represent_
CONFERENCE: PyCon 2005
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REAL-TIME NOTES / ANNOTATIONS OF THE PAPER:
{If you've contributed, add your name, e-mail & URL at the bottom}
"All programs expand until they can read mail" -- jwz
Reading Mail
Sending Mail
Download RSS feeds
Post to weblogs
And upload images
Information wants to be decantralized
Useful information is spread around thentwork
specialized hosted dat sources
Strategies for Interop
1. All our data are belong to us (Roach Motel strategy)
2. Teach your users to cut and paste
3. Teach your applications to talk to other services
Interop is harad
Learn spec
Implement spec
Learn how things work in the real world
Interop is Boring
It's all about messages
From a person or application
To a person, group, or application
Contains
Title
Body
Links (maybe)
Metadata
Email (MIME) message
blog post
RSS item
Atom item
Bookmark
Google search result
IM
Yarn
A Python/Twisted library for workig w/ mesage
standard API for reading/, writing, manipulating messages
Originally developed for HEP - attempt at a universal message proxy
http://yarnproject.org
Version 0.7
HEP is not dead
It is "just resting"
Next release will follow Yarn 0.7
DEMO
Yarn browser - Python and GTK
uses browser to visit:
a local mbox
Slashdot RSS feed
imap folder
Google search results
del.icio.us
Yarn includes a credentials management framework
browser can search what is being displayed
can create messages (example of creating a del.icio.us entry)
Yarn Architecture
Core classes provide common infastructure
client api
connection sharing
cache managment
credential management
searching
query parsing
... missed a few
Plugins
Protocols - HTTP, POP3, iMAP
Formats - RSS, Atom, mbox
MIME type conversion (HTMl -> text, HTML -> XHTML)
API details slide
15 line App slide
Yarn Messages
Preserve underlying data
Convert on demand
DEMO
- load slashdot rss feed into Python interpeter using Yarn, and then manipulate data interactively using REP loop
Because yarn preserves underlying data, you can edit data via python and have the underlying data get updated
Why use Yarn
support multiple protocols without any extra work
concenrat on more intersting problems
Where to use Yarn
Universal Personal Proxy
Roadmap
Code in SVN
New release next week
1.0 summer 2005
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CONTRIBUTORS: {add your name, e-mail address and URL below}
Ted Leung <twl@sauria.com> <http://www.sauria.com>
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