Version the Aphlict notification server and prompt users to upgrade if they're out of date

Summary: Ref T4324. Add some version information to the server status output, and setup checks to test for an unreachable or out-of-date server.

Test Plan:
  - With server down, hit reasonable setup check.
  - With server up and at a bad version, hit reasonable setup check.
  - Viewed `/notification/status/`.
  - The CSS thing fixes this:

{F114445}

Reviewers: btrahan, chad

Reviewed By: chad

CC: chad, aran

Maniphest Tasks: T4324

Differential Revision: https://secure.phabricator.com/D8251

src/__phutil_library_map__.php

@@ -1698,6 +1698,7 @@ phutil_register_library_map(array(
     'PhabricatorNoteExample' => 'applications/uiexample/examples/PhabricatorNoteExample.php',
     'PhabricatorNotificationBuilder' => 'applications/notification/builder/PhabricatorNotificationBuilder.php',
     'PhabricatorNotificationClearController' => 'applications/notification/controller/PhabricatorNotificationClearController.php',
+    'PhabricatorNotificationClient' => 'applications/notification/client/PhabricatorNotificationClient.php',
     'PhabricatorNotificationConfigOptions' => 'applications/config/option/PhabricatorNotificationConfigOptions.php',
     'PhabricatorNotificationController' => 'applications/notification/controller/PhabricatorNotificationController.php',
     'PhabricatorNotificationIndividualController' => 'applications/notification/controller/PhabricatorNotificationIndividualController.php',
@@ -2016,6 +2017,7 @@ phutil_register_library_map(array(
     'PhabricatorSettingsPanelSessions' => 'applications/settings/panel/PhabricatorSettingsPanelSessions.php',
     'PhabricatorSetupCheck' => 'applications/config/check/PhabricatorSetupCheck.php',
     'PhabricatorSetupCheckAPC' => 'applications/config/check/PhabricatorSetupCheckAPC.php',
+    'PhabricatorSetupCheckAphlict' => 'applications/notification/setup/PhabricatorSetupCheckAphlict.php',
     'PhabricatorSetupCheckAuth' => 'applications/config/check/PhabricatorSetupCheckAuth.php',
     'PhabricatorSetupCheckBaseURI' => 'applications/config/check/PhabricatorSetupCheckBaseURI.php',
     'PhabricatorSetupCheckBinaries' => 'applications/config/check/PhabricatorSetupCheckBinaries.php',
@@ -4798,6 +4800,7 @@ phutil_register_library_map(array(
     'PhabricatorSettingsPanelSearchPreferences' => 'PhabricatorSettingsPanel',
     'PhabricatorSettingsPanelSessions' => 'PhabricatorSettingsPanel',
     'PhabricatorSetupCheckAPC' => 'PhabricatorSetupCheck',
+    'PhabricatorSetupCheckAphlict' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckAuth' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckBaseURI' => 'PhabricatorSetupCheck',
     'PhabricatorSetupCheckBinaries' => 'PhabricatorSetupCheck',

src/applications/notification/client/PhabricatorNotificationClient.php

@@ -0,0 +1,28 @@
+<?php
+
+final class PhabricatorNotificationClient {
+
+  const EXPECT_VERSION = 2;
+
+  public static function getServerStatus() {
+    $uri = PhabricatorEnv::getEnvConfig('notification.server-uri');
+    $uri = new PhutilURI($uri);
+
+    $uri->setPath('/status/');
+
+    list($body) = id(new HTTPSFuture($uri))
+      ->setTimeout(3)
+      ->resolvex();
+
+    $status = json_decode($body, true);
+    if (!is_array($status)) {
+      throw new Exception(
+        pht(
+          'Expected JSON response from notification server, received: %s',
+          $body));
+    }
+
+    return $status;
+  }
+
+}

src/applications/notification/controller/PhabricatorNotificationStatusController.php

@@ -4,23 +4,9 @@ final class PhabricatorNotificationStatusController
   extends PhabricatorNotificationController {
 
   public function processRequest() {
-
-    $uri = PhabricatorEnv::getEnvConfig('notification.server-uri');
-    $uri = new PhutilURI($uri);
-
-    $uri->setPath('/status/');
-
-    $future = id(new HTTPSFuture($uri))
-      ->setTimeout(3);
-
     try {
-      list($body) = $future->resolvex();
-      $body = json_decode($body, true);
-      if (!is_array($body)) {
-        throw new Exception("Expected JSON response from server!");
-      }
-
-      $status = $this->renderServerStatus($body);
+      $status = PhabricatorNotificationClient::getServerStatus();
+      $status = $this->renderServerStatus($status);
     } catch (Exception $ex) {
       $status = new AphrontErrorView();
       $status->setTitle("Notification Server Issue");

src/applications/notification/setup/PhabricatorSetupCheckAphlict.php

@@ -0,0 +1,64 @@
+<?php
+
+final class PhabricatorSetupCheckAphlict extends PhabricatorSetupCheck {
+
+  protected function executeChecks() {
+    $enabled = PhabricatorEnv::getEnvConfig('notification.enabled');
+    if (!$enabled) {
+      // Notifications aren't set up, so just ignore all of these checks.
+      return;
+    }
+
+    try {
+      $status = PhabricatorNotificationClient::getServerStatus();
+    } catch (Exception $ex) {
+      $message = pht(
+        'Phabricator is configured to use a notification server, but '.
+        'is unable to connect to it. You should resolve this issue or '.
+        'disable the notification server. It may be helpful to double check '.
+        'your configuration or restart the server using the command below.'.
+        "\n\n".
+        "%s",
+        phutil_tag(
+          'pre',
+          array(),
+          array(
+            get_class($ex),
+            "\n",
+            $ex->getMessage(),
+          )));
+
+
+      $this->newIssue('aphlict.connect')
+        ->setShortName(pht('Notification Server Down'))
+        ->setName(pht('Unable to Connect to Notification Server'))
+        ->setMessage($message)
+        ->addRelatedPhabricatorConfig('notification.enabled')
+        ->addRelatedPhabricatorConfig('notification.server-uri')
+        ->addCommand(
+          pht(
+            "(To start or restart the server, run this command.)\n".
+            "phabricator/ $ sudo ./bin/aphlict"));
+
+      return;
+    }
+
+    $expect_version = PhabricatorNotificationClient::EXPECT_VERSION;
+    $have_version = idx($status, 'version', 1);
+    if ($have_version != $expect_version) {
+      $message = pht(
+        'The notification server is out of date. You are running server '.
+        'version %d, but Phabricator expects version %d. Restart the server '.
+        'to update it, using the command below:',
+        $have_version,
+        $expect_version);
+
+      $this->newIssue('aphlict.version')
+        ->setShortName(pht('Notification Server Version'))
+        ->setName(pht('Notification Server Out of Date'))
+        ->setMessage($message)
+        ->addCommand('phabricator/ $ sudo ./bin/aphlict');
+    }
+
+  }
+}

support/aphlict/server/aphlict_server.js

@@ -192,7 +192,8 @@ var receive_server = http.createServer(function(request, response) {
         'clients.total': generate_id.current_id || 0,
         'messages.in': messages_in,
         'messages.out': messages_out,
-        'log': config.log
+        'log': config.log,
+        'version': 2
       };
 
       response.write(JSON.stringify(status));

webroot/rsrc/css/application/config/setup-issue.css

@@ -94,6 +94,7 @@
   text-align: center;
   font-size: 15px;
   color: #2980b9;
+  margin-top: 12px;
 }
 
 .setup-issue-config {