gistfile1.txt

gemcutter => redis downloads spec
=================================

keys
----

downloads                     => global counter for all gem downloads
downloads:today               => sorted set for downloads from today
downloads:rubygem:rails       => counter for all rails downloads
downloads:version:rails-2.3.5 => counter for all rails 2.3.5 downloads

downloads:rubygem_daily:rails       => JSON daily download hash for this rubygem
downloads:version_daily:rails-2.3.5 => JSON daily download hash for this version

Daily download hash format:
{ 
  '2010-02-01' : 134,
  '2010-02-02' : 289, 
...
}

on a download
-------------

Let's say /gems/bundler-0.9.2.gem was hit...

INCR downloads
INCR downloads:rubygem:bundler
INCR downloads:version:bundler-0.9.2
ZINCRBY downloads:today 1 bundler-0.9.2

on a daily cron
---------------

RENAME downloads:today downloads:yesterday
keys = ZRANGE downloads:yesterday 0 -1

keys.each do |key|
  
  version = Version.find_by_full_name(key)
  downloads = ZSCORE downloads:yesterday key

  version_downloads = JSON.parse( GET downloads:version_daily:#{version.full_name} )
  version_downloads[Date.today] = downloads
  SET downloads:version_daily:#{version.full_name} JSON.dump( version_downloads )

  rubygem_downloads = JSON.parse( GET downloads:rubygem_daily:#{version.rubygem.name} )
  rubygem_downloads[Date.today] += downloads
  SET downloads:rubygem_daily:#{version.rubygem.name} JSON.dump( rubygem_downloads )

end