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epriestley 78d1b62bb8 Streamline handling of Futures and PIDs in daemons
Summary:
Ref T13555. Currently, the daemon future may resolve into a failure state immediately inside "start()", and not have a valid PID when we read it.

Instead, read PIDs from the current active future in all cases, using "hasPID()" to test for the presence of a valid PID.

Since we don't query the PID immediately, we no longer need to explicitly start the future.

Also fix an issue where the same future could be added to the overseer pool more than once if it threw on "resolve()". In general:

  - Before we "resolve()" a future, detach it from the DaemonHandle: we're always done with it.
  - Catch exceptions on resolution and treat them the same way as subprocess resolution errors. These aren't common, but are possible in the general case.
  - Have DaemonHandle add futures to the future pool directly when they're created.

Test Plan:
  - Ran daemons with intentional subprocess creation failures, saw clean recovery.
  - Ran daemons with intentional resolution exceptions, saw clean recovery.

Maniphest Tasks: T13555

Differential Revision: https://secure.phabricator.com/D21425
2020-07-23 11:22:31 -07:00
bin Remove the "ssh-auth-key" script 2019-10-28 17:52:37 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Remove PHPMailer code which generates bogus "Message-ID" email headers 2020-05-19 11:38:58 -07:00
resources In source views, wrap display tabs in "user-select: all" to improve cursor selection behavior 2020-07-17 15:10:06 -07:00
scripts Improve the quality of SSH error messages 2020-06-16 08:59:36 -07:00
src Streamline handling of Futures and PIDs in daemons 2020-07-23 11:22:31 -07:00
support Use "@" to silence "GC list" warnings from "apc_store()" and "apcu_store()" 2020-04-28 04:13:37 -07:00
webroot In source views, wrap display tabs in "user-select: all" to improve cursor selection behavior 2020-07-17 15:10:06 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Continue moving classes with no callers in libphutil or Arcanist to Phabricator 2020-02-12 13:14:04 -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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