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epriestley f8c2225268 Use persistent database connections from web contexts 
Summary:
Ref T11672. Depends on D16577. When establishing a connection from a webserver context, try to use persistent connections.

The hope is that this will fix outbound port exhaustion issues experienced on repository hosts handling large queue volumes.

Test Plan:
Added this to a page:

```lang=php
    $tables = array(
      new PhabricatorUser(),
      new ManiphestTask(),
      new DifferentialRevision(),
      new PhabricatorRepository(),
      new PhabricatorPaste(),
    );

    $ids = array();
    foreach ($tables as $table) {
      $conn = $table->establishConnection('r');

      $cid = queryfx_one(
        $conn,
        'SELECT CONNECTION_ID() cid');

      $ids[get_class($table)] = $cid['cid'];
    }

    var_dump($ids);
```

Reloaded the page a bunch of times and saw no reissued connections (the pool seems to keep a particular connection bound to a particular database), but did see connection reuse across requests.

That is, across reloads the same connection IDs appeared, but the same connection ID never appeared twice in the same request. This is what we want.

Also googled for issues with persistent connections, but everything I found was unconcerning and obscure (local variables and other very complex state that we don't use), and a bunch of the docs are reassuring (transactions, etc., get reset properly).

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11672

Differential Revision: https://secure.phabricator.com/D16578
2016-09-21 14:46:28 -07:00
bin Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Improve Amazon SES code error handling behavior 2016-04-05 17:28:45 -07:00
resources Add a default value for messageCount so writes from old tiers survive the 2016-09-19 19:43:24 -07:00
scripts Continue on bad database configuration from select scripts 2016-09-06 14:20:57 -07:00
src Use persistent database connections from web contexts 2016-09-21 14:46:28 -07:00
support Blanket reject request which may have been poisoned by a "Proxy" header to mitigate the httpoxy vulnerability 2016-07-21 20:18:06 -07:00
webroot Remove old kdb CSS 2016-09-18 18:35:02 -04:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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