impr(dev): add configurable server response slowdown

backend/src/api/routes/index.ts

@@ -25,6 +25,8 @@ import {
   static as expressStatic,
 } from "express";
 import { isDevEnvironment } from "../../utils/misc";
+import { getLiveConfiguration } from "../../init/configuration";
+import Logger from "../../utils/logger";
 
 const pathOverride = process.env["API_PATH_OVERRIDE"];
 const BASE_ROUTE = pathOverride !== undefined ? `/${pathOverride}` : "";
@@ -57,11 +59,14 @@ function addApiRoutes(app: Application): void {
     });
     app.use("/configure", expressStatic(join(__dirname, "../../../private")));
 
-    //simulate delay for all requests
-    // app.use(async (req, res, next) => {
-    //   await new Promise((resolve) => setTimeout(resolve, 1000));
-    //   next();
-    // });
+    app.use(async (req, res, next) => {
+      const slowdown = (await getLiveConfiguration()).dev.responseSlowdownMs;
+      if (slowdown > 0) {
+        Logger.info(`Simulating ${slowdown}ms delay for ${req.path}`);
+        await new Promise((resolve) => setTimeout(resolve, slowdown));
+      }
+      next();
+    });
   }
 
   // Cannot be added to the route map because it needs to be added before the maintenance handler

backend/src/constants/base-configuration.ts

@@ -5,6 +5,9 @@
  */
 export const BASE_CONFIGURATION: SharedTypes.Configuration = {
   maintenance: false,
+  dev: {
+    responseSlowdownMs: 0,
+  },
   results: {
     savingEnabled: false,
     objectHashCheckEnabled: false,
@@ -151,6 +154,17 @@ export const CONFIGURATION_FORM_SCHEMA: ObjectSchema<SharedTypes.Configuration>
         type: "boolean",
         label: "In Maintenance",
       },
+      dev: {
+        type: "object",
+        label: "Development",
+        fields: {
+          responseSlowdownMs: {
+            type: "number",
+            label: "Response Slowdown (miliseconds)",
+            min: 0,
+          },
+        },
+      },
       results: {
         type: "object",
         label: "Results",

shared-types/types.d.ts

@@ -14,6 +14,9 @@ declare namespace SharedTypes {
 
   interface Configuration {
     maintenance: boolean;
+    dev: {
+      responseSlowdownMs: number;
+    };
     quotes: {
       reporting: {
         enabled: boolean;