env.js (2208B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var objectKeys = require( './../../../keys' ); 24 var ENV = require( '@stdlib/process/env' ); 25 26 27 // FUNCTIONS // 28 29 /** 30 * Copies `process.env`. 31 * 32 * ## Notes 33 * 34 * - This implementation accommodates `process.env` on older Node.js versions (<=v0.10.x), where `process.env` was object-like, but would show unexpected behavior when attempting to get own property descriptors. 35 * 36 * @private 37 * @returns {Object} copy of `process.env` 38 */ 39 function copy() { 40 var keys; 41 var env; 42 var out; 43 var i; 44 45 keys = objectKeys( ENV ); 46 out = {}; 47 for ( i = 0; i < keys.length; i++ ) { 48 env = keys[ i ]; 49 out[ env ] = ENV[ env ]; 50 } 51 return out; 52 } 53 54 55 // MAIN // 56 57 /** 58 * Returns worker environment variables. 59 * 60 * @private 61 * @param {Options} opts - options 62 * @param {string} opts.cmd - executable file/command 63 * @param {boolean} opts.ordered - boolean indicating whether to preserve order of script output 64 * @param {(NonNegativeInteger|null)} opts.uid - process user identity 65 * @param {(NonNegativeInteger|null)} opts.gid - process group identity 66 * @param {string} opts.encoding - `stdio` encoding 67 * @param {NonNegativeInteger} opts.maxBuffer - max child process `stdio` buffer size 68 * @returns {Object} environment variables 69 */ 70 function env( opts ) { 71 var out = copy(); 72 73 out.WORKER_CMD = opts.cmd; 74 out.WORKER_ENCODING = opts.encoding; 75 out.WORKER_MAX_BUFFER = opts.maxBuffer; 76 77 if ( opts.ordered ) { 78 out.WORKER_ORDERED = '1'; 79 } 80 if ( opts.uid ) { 81 out.WORKER_UID = opts.uid; 82 } 83 if ( opts.gid ) { 84 out.WORKER_GID = opts.gid; 85 } 86 return out; 87 } 88 89 90 // EXPORTS // 91 92 module.exports = env;