Fix orphan database connections resulting in an inability to connect to databases. #5567

web/pgadmin/browser/__init__.py

@@ -626,7 +626,8 @@ def utils():
             is_admin=current_user.has_role("Administrator"),
             login_url=login_url,
             username=current_user.username,
-            auth_source=auth_source
+            auth_source=auth_source,
+            heartbeat_timeout=config.SERVER_HEARTBEAT_TIMEOUT
         ),
         200, {'Content-Type': MIMETYPE_APP_JS})
 

web/pgadmin/browser/server_groups/servers/static/js/server.js

@@ -786,6 +786,10 @@ define('pgadmin.node.server', [
             if(data.errmsg) {
               Notify.error(data.errmsg);
             }
+            // Generate the event that server is connected
+            pgBrowser.Events.trigger(
+              'pgadmin:server:connected', data._id, item, data
+            );
           }
         })
         .fail(function(xhr, status, error) {

web/pgadmin/browser/static/js/browser.js

@@ -15,6 +15,7 @@ import Notify, {initializeModalProvider, initializeNotifier} from '../../../stat
 import { checkMasterPassword } from '../../../static/js/Dialogs/index';
 import { pgHandleItemError } from '../../../static/js/utils';
 import { Search } from './quick_search/trigger_search';
+import { send_heartbeat } from './heartbeat';
 
 define('pgadmin.browser', [
   'sources/gettext', 'sources/url_for', 'require', 'jquery',
@@ -581,6 +582,10 @@ define('pgadmin.browser', [
           .fail(function() {/*This is intentional (SonarQube)*/});
       }, 300000);
 
+      obj.Events.on(
+        'pgadmin:server:connected', send_heartbeat.bind(obj)
+      );
+
       obj.set_master_password('');
       obj.check_corrupted_db_file();
       obj.Events.on('pgadmin:browser:tree:add', obj.onAddTreeNode.bind(obj));

web/pgadmin/browser/static/js/heartbeat.js

@@ -0,0 +1,31 @@
+/////////////////////////////////////////////////////////////
+//
+// pgAdmin 4 - PostgreSQL Tools
+//
+// Copyright (C) 2013 - 2023, The pgAdmin Development Team
+// This software is released under the PostgreSQL Licence
+//
+//////////////////////////////////////////////////////////////
+
+import gettext from 'sources/gettext';
+import url_for from 'sources/url_for';
+import getApiInstance from '../../../static/js/api_instance';
+import Notifier from '../../../static/js/helpers/Notifier';
+import pgAdmin from 'sources/pgadmin';
+
+const axiosApi = getApiInstance();
+let HEARTBEAT_TIMEOUT = pgAdmin.heartbeat_timeout * 1000;
+
+export function send_heartbeat(_server_id) {
+  // Send heartbeat to the server every 30 seconds
+  setInterval(function() {
+    axiosApi.post(url_for('misc.heartbeat'), {'sid': _server_id})
+      .then(() => {
+        // pass
+      })
+      .catch((error) => {
+        Notifier.error(gettext(`pgAdmin server not responding, try to login again: ${error.message || error.response.data.errormsg}`));
+      });
+
+  }, HEARTBEAT_TIMEOUT);
+}

web/pgadmin/browser/templates/browser/js/utils.js

@@ -66,6 +66,9 @@ define('pgadmin.browser.utils',
   /* GET the pgadmin server's locale */
   pgAdmin['pgadmin_server_locale'] =  '{{pgadmin_server_locale}}';
 
+   /* Server Heartbeat Timeout */
+  pgAdmin['heartbeat_timeout'] =  '{{heartbeat_timeout}}';
+
   // Define list of nodes on which Query tool option doesn't appears
   let unsupported_nodes = pgAdmin.unsupported_nodes = [
      'server_group', 'server', 'coll-tablespace', 'tablespace',