Execute Herald again after promoting revisions out of the "Draft" state

Summary:
Fixes T13027. Ref T2543. When revisions promote from "Draft" because builds finish or no builds are configured, the status currently switches from "Draft" to "Needs Review" without re-running Herald.

This means that some rules -- notably, "Send me an email" rules -- don't fire as soon as they should.

Instead of applying this promotion in a hacky way inline, queue it and apply it normally in a second edit, after the current group finishes.

Test Plan:
  - Created a revision, reviewed Herald transcripts.
  - Saw three Herald passes:
    - First pass (revision creation) triggered builds and no email.
    - Second pass (builds finished) did not trigger builds (no update) and did not trigger email (revision still a draft).
    - Third pass (after promotion out of 'draft') did not trigger builds (no update) but did trigger email (revision no longer a draft).

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13027, T2543

Differential Revision: https://secure.phabricator.com/D18819

src/applications/differential/editor/DifferentialTransactionEditor.php

@@ -1588,11 +1588,8 @@ final class DifferentialTransactionEditor
           ->setAuthorPHID($author_phid)
           ->setTransactionType(
             DifferentialRevisionRequestReviewTransaction::TRANSACTIONTYPE)
-          ->setOldValue(false)
           ->setNewValue(true);
 
-        $xaction = $this->populateTransaction($object, $xaction);
-
         // If we're creating this revision and immediately moving it out of
         // the draft state, mark this as a create transaction so it gets
         // hidden in the timeline and mail, since it isn't interesting: it
@@ -1601,15 +1598,10 @@ final class DifferentialTransactionEditor
           $xaction->setIsCreateTransaction(true);
         }
 
-        $object->openTransaction();
+        // Queue this transaction and apply it separately after the current
-          $object
+        // batch of transactions finishes so that Herald can fire on the new
-            ->setStatus(DifferentialRevisionStatus::NEEDS_REVIEW)
+        // revision state. See T13027 for discussion.
-            ->save();
+        $this->queueTransaction($xaction);
-
-          $xaction->save();
-        $object->saveTransaction();
-
-        $xactions[] = $xaction;
       }
     }
 

src/applications/differential/xaction/DifferentialRevisionRequestReviewTransaction.php

@@ -57,6 +57,9 @@ final class DifferentialRevisionRequestReviewTransaction
           'revisions.'));
     }
 
+    // When revisions automatically promote out of "Draft" after builds finish,
+    // the viewer may be acting as the Harbormaster application.
+    if (!$viewer->isOmnipotent()) {
       if (!$this->isViewerRevisionAuthor($object, $viewer)) {
         throw new Exception(
           pht(
@@ -64,6 +67,7 @@ final class DifferentialRevisionRequestReviewTransaction
             'the author of the revision.'));
       }
     }
+  }
 
   public function getTitle() {
     return pht(

src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php

@@ -70,6 +70,8 @@ abstract class PhabricatorApplicationTransactionEditor
   private $feedRelatedPHIDs = array();
   private $modularTypes;
 
+  private $transactionQueue = array();
+
   const STORAGE_ENCODING_BINARY = 'binary';
 
   /**
@@ -1174,6 +1176,8 @@ abstract class PhabricatorApplicationTransactionEditor
         'priority' => PhabricatorWorker::PRIORITY_ALERTS,
       ));
 
+    $this->flushTransactionQueue($object);
+
     return $xactions;
   }
 
@@ -3864,4 +3868,39 @@ abstract class PhabricatorApplicationTransactionEditor
     return pht('%s created an object: %s.', $author, $object);
   }
 
+/* -(  Queue  )-------------------------------------------------------------- */
+
+  protected function queueTransaction(
+    PhabricatorApplicationTransaction $xaction) {
+    $this->transactionQueue[] = $xaction;
+    return $this;
+  }
+
+  private function flushTransactionQueue($object) {
+    if (!$this->transactionQueue) {
+      return;
+    }
+
+    $xactions = $this->transactionQueue;
+    $this->transactionQueue = array();
+
+    $editor = $this->newQueueEditor();
+
+    return $editor->applyTransactions($object, $xactions);
+  }
+
+  private function newQueueEditor() {
+    $editor = id(newv(get_class($this), array()))
+      ->setActor($this->getActor())
+      ->setContentSource($this->getContentSource())
+      ->setContinueOnNoEffect($this->getContinueOnNoEffect())
+      ->setContinueOnMissingFields($this->getContinueOnMissingFields());
+
+    if ($this->actingAsPHID !== null) {
+      $editor->setActingAsPHID($this->actingAsPHID);
+    }
+
+    return $editor;
+  }
+
 }