When query panels overheat, degrade them and show a warning

Summary:
Depends on D20334. Ref T13272. After recent changes to make overheating queries throw by default, dashboard panels now fail into an error state when they overheat.

This is a big step up from the hard-coded homepage panels removed by D20333, but can be improved. Let these panels render partial results when they overheat and show a human-readable warning.

Test Plan: {F6314114}

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13272

Differential Revision: https://secure.phabricator.com/D20335

src/applications/dashboard/paneltype/PhabricatorDashboardQueryPanelType.php

@@ -106,9 +106,37 @@ final class PhabricatorDashboardQueryPanelType
       }
     }
 
-    $results = $engine->executeQuery($query, $pager);
+    $query->setReturnPartialResultsOnOverheat(true);
 
-    return $engine->renderResults($results, $saved);
+    $results = $engine->executeQuery($query, $pager);
+    $results_view = $engine->renderResults($results, $saved);
+
+    $is_overheated = $query->getIsOverheated();
+    $overheated_view = null;
+    if ($is_overheated) {
+      $content = $results_view->getContent();
+
+      $overheated_message =
+        PhabricatorApplicationSearchController::newOverheatedError(
+          (bool)$results);
+
+      $overheated_warning = id(new PHUIInfoView())
+        ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
+        ->setTitle(pht('Query Overheated'))
+        ->setErrors(
+          array(
+            $overheated_message,
+          ));
+
+      $overheated_box = id(new PHUIBoxView())
+        ->addClass('mmt mmb')
+        ->appendChild($overheated_warning);
+
+      $content = array($content, $overheated_box);
+      $results_view->setContent($content);
+    }
+
+    return $results_view;
   }
 
   public function adjustPanelHeader(

src/applications/search/controller/PhabricatorApplicationSearchController.php

@@ -850,19 +850,31 @@ final class PhabricatorApplicationSearchController
         ));
   }
 
-  private function newOverheatedView(array $results) {
+  public static function newOverheatedError($has_results) {
-    if ($results) {
+    $overheated_link = phutil_tag(
+      'a',
+      array(
+        'href' => 'https://phurl.io/u/overheated',
+        'target' => '_blank',
+      ),
+      pht('Learn More'));
+
+    if ($has_results) {
       $message = pht(
-        'Most objects matching your query are not visible to you, so '.
+        'This query took too long, so only some results are shown. %s',
-        'filtering results is taking a long time. Only some results are '.
+        $overheated_link);
-        'shown. Refine your query to find results more quickly.');
     } else {
       $message = pht(
-        'Most objects matching your query are not visible to you, so '.
+        'This query took too long. %s',
-        'filtering results is taking a long time. Refine your query to '.
+        $overheated_link);
-        'find results more quickly.');
     }
 
+    return $message;
+  }
+
+  private function newOverheatedView(array $results) {
+    $message = self::newOverheatedError((bool)$results);
+
     return id(new PHUIInfoView())
       ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
       ->setFlush(true)