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epriestley acb141cf52 Expire and garbage collect unused sessions 
Summary:
Ref T3720. Ref T4310. Currently, we limit the maximum number of concurrent sessions of each type. This is primarily because sessions predate garbage collection and we had no way to prevent the session table from growing fairly quickly and without bound unless we did this.

Now that we have GC (and it's modular!) we can just expire unused sessions after a while and throw them away:

  - Add a `sessionExpires` column to the table, with a key.
  - Add a GC for old sessions.
  - When we establish a session, set `sessionExpires` to the current time plus the session TTL.
  - When a user uses a session and has used up more than 20% of the time on it, extend the session.

In addition to this, we could also rotate sessions, but I think that provides very little value. If we do want to implement it, we should hold it until after T3720 / T4310.

Test Plan:
  - Ran schema changes.
  - Looked at database.
  - Tested GC:
    - Started GC.
    - Set expires on one row to the past.
    - Restarted GC.
    - Verified GC nuked the session.
  - Logged in.
  - Logged out.
  - Ran Conduit method.
  - Tested refresh:
    - Set threshold to 0.0001% instead of 20%.
    - Loaded page.
    - Saw a session extension ever few page loads.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4310, T3720

Differential Revision: https://secure.phabricator.com/D7976
2014-01-15 13:56:16 -08:00
bin Begin construction of bin/celerity map 2013-12-31 18:02:41 -08:00
conf Remove metamta.send-immediately 2014-01-14 13:22:47 -08:00
externals Phragment v0 2013-12-07 12:43:49 +11:00
resources Expire and garbage collect unused sessions 2014-01-15 13:56:16 -08:00
scripts Fix typo 2014-01-15 10:03:50 -08:00
src Expire and garbage collect unused sessions 2014-01-15 13:56:16 -08:00
support Remove spurious "+x" from files that shouldn't have it 2013-10-05 05:18:17 -07:00
webroot Add OK icon. It's ok. 2014-01-15 08:00:55 -08:00
.arcconfig Use JsShrink if jsxmin is not available 2013-05-18 17:04:22 -07:00
.divinerconfig Centralize rendering of application mail bodies 2012-07-16 19:01:43 -07:00
.editorconfig Specify config for text editors 2012-11-03 22:34:44 -07:00
.gitignore Drive all Celerity operations from the new map 2013-12-31 18:04:25 -08:00
LICENSE Delete license headers from files 2012-11-05 11:16:51 -08:00
NOTICE Increment year. 2013-01-03 05:45:08 -08:00
README Revert errant commit of example change from an earlier test. 2013-12-17 08:38:42 -08:00

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