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epriestley 3d70db9eb5 Queue a worker task to send mail only after committing the mail transaction 
Summary:
Fixes T12844. This code is misleading: the daemon insert is happening on a different connection, and is not inside the transaction on the Mail connection.

What actually happens is this:

  - (Connection A) `BEGIN`
  - (Connection A) `INSERT INTO mail ...`
  - (Connection B) `INSERT INTO worker ...` <-- This is a different connection, and it is NOT in a transaction!
  - There's a race window here: the worker row is globally visible but the mail row is still isolated inside the transaction.
  - (Connection A) `COMMIT`
  - Now we're clear: the mail row is globally visible.

Change this code to reflect what's actually happening.

This means that if the worker row insert fails for some reason, we'll now throw with a mail row written to the database. But this is fine: it doesn't send on its own (so it can't cause mail loops or anything) and it can be re-queued with `bin/mail resend` if necessary without too much trouble.

Test Plan: See T12844 for particulars. Made some comments on tasks, saw the daemons send mail.

Reviewers: chad, amckinley, jmeador

Reviewed By: jmeador

Maniphest Tasks: T12844

Differential Revision: https://secure.phabricator.com/D18124
2017-06-14 12:27:00 -07:00
bin Add a profileimage generation workflow for the cli 2017-03-04 15:43:13 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Add DiffusionBranchListView for browsing branches 2017-06-13 11:07:03 -07:00
scripts Add a profileimage generation workflow for the cli 2017-03-04 15:43:13 -08:00
src Queue a worker task to send mail only after committing the mail transaction 2017-06-14 12:27:00 -07:00
support Update rate limiting for APCu and X-Forwarded-For 2017-04-21 20:39:14 -07:00
webroot Add DiffusionBranchListView for browsing branches 2017-06-13 11:07:03 -07:00
.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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