openecomp-ui/fixture/fixture.js

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * SDC
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 'use strict';
  22
  23 const PORT = 4000;
  24
  25 function startFixtureServer() {
  26         return require('child_process').fork('fixture/express', [PORT]);
  27 }
  28
  29 function buildProxyMiddleware() {
  30         return require('./middleware')(PORT);
  31 }
  32
  33 function getProxyData(fixtureServerOptions, req, res, next) {
  34         if (!fixtureServerOptions.serverProcess) {
  35                 fixtureServerOptions.serverProcess = startFixtureServer();
  36         }
  37
  38         return fixtureServerOptions.proxy(req, res, next);
  39 }
  40
  41 function wrapFixture(fixtureServerOptions, req, res, next) {
  42         if (fixtureServerOptions.proxy) {
  43                 return getProxyData(fixtureServerOptions, req, res, next);
  44         } else {
  45                 next();
  46         }
  47 }
  48
  49
  50 module.exports = function fixture(options) {
  51
  52         let proxy;
  53         if(options.enabled) {
  54                 proxy = buildProxyMiddleware();
  55         }
  56
  57         let fixtureServerOptions = {
  58                 proxy,
  59                 serverProcess: null
  60         };
  61
  62         (function startWatch() {
  63                 var nodeWatch = require('node-watch');
  64
  65                 nodeWatch(['fixture/data', 'fixture/express.js'], function () {
  66                         if (fixtureServerOptions.proxy && fixtureServerOptions.serverProcess) {
  67                                 fixtureServerOptions.serverProcess.kill();
  68                                 fixtureServerOptions.serverProcess = startFixtureServer();
  69                         }
  70                 });
  71
  72                 nodeWatch(['devConfig.json'], function () {
  73                         let devConfigDefaults = require('../devConfig.defaults');
  74                         require('fs').readFile('devConfig.json', (err, data) => {
  75                                 if (err) throw err;
  76                                 const config = Object.assign({}, devConfigDefaults, JSON.parse(data));
  77                                 if (config.useFixture) {
  78                                         fixtureServerOptions.proxy = proxy || buildProxyMiddleware();
  79                                 }
  80                                 else {
  81                                         fixtureServerOptions.proxy = null;
  82                                         if (fixtureServerOptions.serverProcess) {
  83                                                 fixtureServerOptions.serverProcess.kill();
  84                                                 fixtureServerOptions.serverProcess = null;
  85                                         }
  86                                 }
  87                         });
  88                 });
  89
  90         })();
  91
  92         return (req, res, next) => wrapFixture(fixtureServerOptions, req, res, next);
  93 };