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Improve Arcanist event doucmentation
Summary: - Soft dependencies on D3423, D3422, D3421. - Document the availability of 'workflow' on all events. - Improve instructions on building, configuring and debugging event handlers. Test Plan: Read documentation. Reviewers: vrana, nh Reviewed By: vrana CC: aran Differential Revision: https://secure.phabricator.com/D3424
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@ -5,17 +5,19 @@ Using Phabricator event listeners to customize behavior.
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= Overview =
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Phabricator allows you to install custom runtime event listeners which can react
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to certain things happening (like a Maniphest Task being edited) and run custom
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code to perform logging, synchronize with other systems, or modify workflows.
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Phabricator and Arcanist allow you to install custom runtime event listeners
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which can react to certain things happening (like a Maniphest Task being edited
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or a user creating a new Differential Revision) and run custom code to perform
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logging, synchronize with other systems, or modify workflows.
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These listeners are PHP classes which you install beside Phabricator, and which
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Phabricator loads at runtime and runs in-process. They are the most direct and
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powerful way to respond to events.
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These listeners are PHP classes which you install beside Phabricator or
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Arcanist, and which Phabricator loads at runtime and runs in-process. They
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require somewhat more effort upfront than simple configuration switches, but are
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the most direct and powerful way to respond to events.
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= Installing Event Listeners =
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= Installing Event Listeners (Phabicator) =
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To install event listeners, follow these steps:
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To install event listeners in Phabricator, follow these steps:
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- Write a listener class which extends @{class@libphutil:PhutilEventListener}.
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- Add it to a libphutil library, or create a new library (for instructions,
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@ -30,6 +32,22 @@ It should appear at the top under "Registered Event Listeners". You can also
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see any events the page emitted there. For details on DarkConsole, see
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@{article:Using DarkConsole}.
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= Installing Event Listeners (Arcanist) =
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To install event listeners in Arcanist, follow these steps:
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- Write a listener class which extends @{class@libphutil:PhutilEventListener}.
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- Add it to a libphutil library, or create a new library (for instructions,
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see @{article:libphutil Libraries User Guide}.
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- Configure Phabricator to load the library by adding it to `load`
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in the Arcanist config (e.g., `.arcconfig`, or user/global config).
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- Configure Arcanist to install the event listener by adding the class
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name to `events.listeners` in the Arcanist config.
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You can verify your listener is registered by running any `arc` command with
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`--trace`. You should see output indicating your class was registered as an
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event listener.
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= Example Listener =
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Phabricator includes an example event listener,
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@ -67,6 +85,14 @@ events. Normally, you want to listen only to specific events, but if you're
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writing a generic handler you can listen to all events with this constant
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rather than by enumerating each event.
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== Arcanist Events ==
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Arcanist event constants are listed in @{class@arcanist:ArcanistEventType}.
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All Arcanist events have this data available:
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- `workflow` The active @{class@arcanist:ArcanistBaseWorkflow}.
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== Arcanist: Commit: Will Commit SVN ==
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The constant for this event is `ArcanistEventType::TYPE_COMMIT_WILLCOMMITSVN`.
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@ -75,7 +101,6 @@ This event is dispatched before an `svn commit` occurs and allows you to
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modify the commit message. Data available on this event:
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- `message` The text of the message.
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- `workflow` The active @{class:ArcanistBaseWorkflow}.
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== Arcanist: Diff: Will Build Message ==
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