Move flip cache debug service into [debug] (#3057)

Close #2636

services/debug/debug.service.js

@@ -3,6 +3,7 @@
 const { NonMemoryCachingBaseService } = require('..')
 
 const serverStartTime = new Date(new Date().toGMTString())
+let bitFlip = false
 
 module.exports = class Debug extends NonMemoryCachingBaseService {
   static get category() {
@@ -19,7 +20,7 @@ module.exports = class Debug extends NonMemoryCachingBaseService {
   static get route() {
     return {
       base: 'debug',
-      pattern: ':which(time|starttime)',
+      pattern: ':which(time|starttime|flip)',
     }
   }
 
@@ -35,6 +36,22 @@ module.exports = class Debug extends NonMemoryCachingBaseService {
           label: 'start time',
           message: new Date(serverStartTime).toUTCString(),
         }
+      // For production cache debugging.
+      case 'flip':
+        bitFlip = !bitFlip
+        if (bitFlip) {
+          return {
+            label: 'flip',
+            message: 'on',
+            color: 'brightgreen',
+          }
+        } else {
+          return {
+            label: 'flip',
+            message: 'off',
+            color: 'red',
+          }
+        }
     }
   }
 }

services/debug/debug.tester.js

@@ -7,3 +7,11 @@ const t = (module.exports = require('../tester').createServiceTester())
 t.create('start time')
   .get('/starttime.json')
   .expectJSONTypes({ name: 'start time', value: Joi.date().required() })
+
+t.create('Flip: first request')
+  .get('/flip.json')
+  .expectJSON({ name: 'flip', value: 'on' })
+
+t.create('Flip: second request')
+  .get('/flip.json')
+  .expectJSON({ name: 'flip', value: 'off' })