added support for _delay in query string to delay response of request on per request basis (#673)

* added support for passing _delay as query parameter to delay response by X milliseconds

* added tests / fixed linting error

src/server/router/delay.js

@@ -0,0 +1,11 @@
+const pause = require('connect-pause')
+
+module.exports = function delay(req, res, next) {
+  // NOTE: for some reason unknown to me, if the default is 0, the tests seems to add 2 seconds
+  // NOTE: to each test, a default value of 1 does not seem to be effected by that issue
+  const _delay = !isNaN(parseFloat(req.query._delay))
+    ? parseFloat(req.query._delay)
+    : 1
+  delete req.query._delay
+  pause(_delay)(req, res, next)
+}

src/server/router/nested.js

@@ -1,8 +1,10 @@
 const express = require('express')
 const pluralize = require('pluralize')
+const delay = require('./delay')
 
 module.exports = opts => {
   const router = express.Router()
+  router.use(delay)
 
   // Rewrite URL (/:resource/:id/:nested -> /:nested) and request query
   function get(req, res, next) {

src/server/router/plural.js

@@ -4,10 +4,12 @@ const pluralize = require('pluralize')
 const write = require('./write')
 const getFullURL = require('./get-full-url')
 const utils = require('../utils')
+const delay = require('./delay')
 
 module.exports = (db, name, opts) => {
   // Create router
   const router = express.Router()
+  router.use(delay)
 
   // Embed function used in GET /name and GET /name/id
   function embed(resource, e) {

src/server/router/singular.js

@@ -1,9 +1,11 @@
 const express = require('express')
 const write = require('./write')
 const getFullURL = require('./get-full-url')
+const delay = require('./delay')
 
 module.exports = (db, name) => {
   const router = express.Router()
+  router.use(delay)
 
   function show(req, res, next) {
     res.locals.data = db.get(name).value()