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epriestley a88b69a4b6 Add a "setup" cache
Summary:
See T2062. This cache allows us to essentially implement this sort of block:

  if (this_code_has_not_run_since_the_last_server_restart()) {
    ...
  }

This will let us do setup checks automatically (i.e., without a specialized setup mode) without imposing hundreds of milliseconds of `git submodule status` and similar checks on every page load, even if an install does not have APC.

Broadly, the major goals here are:

  - Reduce user errors and support costs related to misconfiguration (e.g., failure to update submodules).
  - Simplify setup and configuration (remove 'phabricator.setup', remove/reduce PHABRICATOR_ENV).
  - Move as much configuration to the web as possible (required for SaaS).

Test Plan:
Added this block to webroot/index.php:

  $cache = PhabricatorCaches::getSetupCache();
  $result = $cache->getKeys(array('x'));
  if (empty($result['x'])) {
    phlog('Cache miss + set.');
    $cache->setKeys(array('x' => 'y'));
  } else {
    phlog('Cache hit.');
  }

Verified it used APC correctly.
Disabled APC and verified it degraded to a reasonable disk-based behavior.

If we miss both of these we end up with no actual caching, but that's the best we can do. This code will also run too early in setup for it to be appropriate to raise exceptions out of this pathway -- later on, we can raise a warning that APC is not installed.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2227, T2062

Differential Revision: https://secure.phabricator.com/D4281
2012-12-25 06:09:51 -08:00
bin Improve Search architecture 2012-12-21 14:21:31 -08:00
conf Implement a more compact, general database-backed key-value cache 2012-12-21 14:17:56 -08:00
externals one more phame tweak for better social sharing -- make sure $uri is the full uri 2012-12-21 13:46:23 -08:00
resources Implement a more compact, general database-backed key-value cache 2012-12-21 14:17:56 -08:00
scripts Improve Search architecture 2012-12-21 14:21:31 -08:00
src Add a "setup" cache 2012-12-25 06:09:51 -08:00
support Make bin/aphlict behave slightly better when forking 2012-12-20 10:38:13 -08:00
webroot Let datepicker jump one month forward 2012-12-21 16:54:48 -08:00
.arcconfig Delete license headers from files 2012-11-05 11:16:51 -08:00
.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 Remove support for custom logos 2012-07-30 11:09:28 -07:00
.gitmodules Just change the location. 2011-05-28 15:14:54 -07:00
LICENSE Delete license headers from files 2012-11-05 11:16:51 -08:00
NOTICE Delete license headers from files 2012-11-05 11:16:51 -08:00
README Delete license headers from files 2012-11-05 11:16:51 -08:00

Phabricator is a open source collection of web applications which make it easier
to write, review, and share source code. Phabricator was developed at Facebook.

This is an early release. It's pretty high-quality and usable, but under
active development so things may change quickly.

You can learn more about the project and find links to documentation and
resources at: http://phabricator.org/

LICENSE

Phabricator is released under the Apache 2.0 license except as otherwise noted.