Stop using process/filesystem-based checks to determine if daemons are running

Summary:
We currently check if daemons are running using the filesystem and process list. These checks reach the wrong result for a lot of users because their webservers can't read the filesystem or process list. They also reach the wrong result for daemons running on other machines.

Instead, query the active daemon list to see if daemons are running. This should be significantly more reliable.

(We didn't do this before because the running daemon list mechanism didn't exist when the check was written, and at the time it was more complex than doing a simple filesystem/process list thing.)

Test Plan: Viewed `/repositories/` with and without daemons running, saw appropriate warning or lack of warning.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6722

src/applications/daemon/query/PhabricatorDaemonLogQuery.php

@@ -8,6 +8,7 @@ final class PhabricatorDaemonLogQuery
 
   private $ids;
   private $status = self::STATUS_ALL;
+  private $daemonClasses;
 
   public static function getTimeUntilUnknown() {
     return 3 * PhutilDaemonOverseer::HEARTBEAT_WAIT;
@@ -27,6 +28,11 @@ final class PhabricatorDaemonLogQuery
     return $this;
   }
 
+  public function withDaemonClasses(array $classes) {
+    $this->daemonClasses = $classes;
+    return $this;
+  }
+
   public function loadPage() {
     $table = new PhabricatorDaemonLog();
     $conn_r = $table->establishConnection('r');
@@ -109,6 +115,13 @@ final class PhabricatorDaemonLogQuery
         $this->getStatusConstants());
     }
 
+    if ($this->daemonClasses) {
+      $where[] = qsprintf(
+        $conn_r,
+        'daemon IN (%Ls)',
+        $this->daemonClasses);
+    }
+
     $where[] = $this->buildPagingClause($conn_r);
     return $this->formatWhereClause($where);
   }

src/applications/repository/controller/PhabricatorRepositoryController.php

@@ -22,15 +22,14 @@ abstract class PhabricatorRepositoryController extends PhabricatorController {
   }
 
   private function isPullDaemonRunning() {
-    // TODO: This is yuck, fix it.
-    $control = new PhabricatorDaemonManagementListWorkflow();
-    $daemons = $control->loadRunningDaemons();
-    foreach ($daemons as $daemon) {
-      if ($daemon->isRunning() &&
-          $daemon->getName() == 'PhabricatorRepositoryPullLocalDaemon')
-        return true;
-    }
-    return false;
+    $daemons = id(new PhabricatorDaemonLogQuery())
+      ->setViewer(PhabricatorUser::getOmnipotentUser())
+      ->withStatus(PhabricatorDaemonLogQuery::STATUS_ALIVE)
+      ->withDaemonClasses(array('PhabricatorRepositoryPullLocalDaemon'))
+      ->setLimit(1)
+      ->execute();
+
+    return (bool)$daemons;
   }
 
   protected function renderDaemonNotice() {
@@ -47,24 +46,14 @@ abstract class PhabricatorRepositoryController extends PhabricatorController {
       "repositories. For instructions on starting the daemon, see %s.",
       phutil_tag('strong', array(), $documentation));
 
-    try {
     $daemon_running = $this->isPullDaemonRunning();
     if ($daemon_running) {
       return null;
     }
     $title = "Repository Daemon Not Running";
     $message = hsprintf(
-        "<p>The repository daemon is not running on this machine. %s</p>",
+      "<p>The repository daemon is not running. %s</p>",
       $common);
-    } catch (Exception $ex) {
-      $title = "Unable To Verify Repository Daemon";
-      $message = hsprintf(
-        "<p>Unable to determine if the repository daemon is running on this ".
-        "machine. %s</p>".
-        "<p><strong>Exception:</strong> %s</p>",
-        $common,
-        $ex->getMessage());
-    }
 
     $view = new AphrontErrorView();
     $view->setSeverity(AphrontErrorView::SEVERITY_WARNING);