Use SocketIO instead of REST for fetching database tables data in ERD. #5065

web/pgadmin/static/js/socket_instance.js

@@ -0,0 +1,45 @@
+/////////////////////////////////////////////////////////////
+//
+// pgAdmin 4 - PostgreSQL Tools
+//
+// Copyright (C) 2013 - 2022, The pgAdmin Development Team
+// This software is released under the PostgreSQL Licence
+//
+//////////////////////////////////////////////////////////////
+import { io } from 'socketio';
+
+export function openSocket(namespace, options) {
+  return new Promise((resolve, reject)=>{
+    const socketObj = io(namespace, {
+      pingTimeout: 120000,
+      pingInterval: 25000,
+      ...options,
+    });
+
+    /* Once the object is created, connect event is emitted.
+    Backend must implement connect and emit connected on success,
+    connect_error on failure.
+    */
+    socketObj.on('connected', ()=>{
+      resolve(socketObj);
+    });
+    socketObj.on('connect_error', ()=>{
+      reject();
+    });
+    socketObj.on('disconnect', ()=>{
+      reject();
+    });
+  });
+}
+
+export function socketApiGet(socket, endpoint, params) {
+  return new Promise((resolve, reject)=>{
+    socket.emit(endpoint, params);
+    socket.on(`${endpoint}_success`, (data)=>{
+      resolve(data);
+    });
+    socket.on(`${endpoint}_failed`, (data)=>{
+      reject(data);
+    });
+  });
+}