1 | /*
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2 | * Copyright (c) 2018 One Hill Technologies, LLC
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 |
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17 | const all = require ('require-all');
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18 | const { BO } = require ('base-object');
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19 | const _ = require ('lodash');
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20 | const path = require ('path');
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21 | const fs = require ('fs');
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22 | const assert = require ('assert');
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23 | const {env} = require ('./environment');
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24 |
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25 | function load (opts) {
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26 | return new Promise ((resolve) => {
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27 | fs.stat (opts.dirname, (err, stats) => {
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28 | if (err || !stats.isDirectory ())
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29 | return resolve ({});
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30 |
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31 | // Load all the objects in the directory.
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32 | let objects = all (opts);
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33 |
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34 | resolve (objects);
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35 | });
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36 | });
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37 | }
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38 |
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39 | /**
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40 | * @class Loader
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41 | *
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42 | * Utility class for loading entities from a directory.
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43 | */
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44 | module.exports = BO.extend ({
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45 | /**
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46 | * Run the loader.
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47 | *
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48 | * @param opts
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49 | * @returns {Promise<[]>}
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50 | */
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51 | load (opts) {
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52 | assert (!!opts.dirname, 'Your options must have a `dirname` property');
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53 |
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54 | // By default, we only want files that end in .js, and do not
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55 | // start with dash (-).
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56 | let defaults = {
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57 | excludeDirs: /^(env|\.(git|svn))$/,
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58 | recursive: true,
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59 | filter: /^(?!-)(.+)\.js$/
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60 | };
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61 |
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62 | // Load the assets from the directory and from the environment directory,
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63 | // if applicable. We need to list the loads in this order so that when we
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64 | // merge, environment specific assets will take precedence.
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65 | //
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66 |
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67 | let dirname = opts.dirname;
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68 | let envPath = path.join (dirname, 'env', env);
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69 |
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70 | let promises = [
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71 | load (_.merge ({}, defaults, opts, {dirname})),
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72 | load (_.merge ({}, defaults, opts, {dirname: envPath}))
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73 | ];
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74 |
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75 | return Promise.all (promises).then (result => {
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76 | let assets = _.merge ({}, ...result);
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77 | return Promise.resolve (assets);
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78 | });
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79 | }
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80 | });
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