75 lines
3.2 KiB
JavaScript
75 lines
3.2 KiB
JavaScript
const fs = require('fs')
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const path = require('path')
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const commander = require('commander')
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const deepmerge = require('deepmerge')
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module.exports = {
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mergeEnvar({rawEnvar={}, envarFiles=['./envar-base-basic.js', './envar-base-custom.js', './envar-base-secret.js'], hasCommander=true} = {}) {
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if (!global.envar) {
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global.envar = rawEnvar
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// 不知为何，必须定义成全局变量，才能保证多次require只执行一次。
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console.info('<<<<<<<< Configuring Environment Variables <<<<<<<<')
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console.info('- Loading Configuration Files (读取配置文件)')
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for (let configFile of envarFiles){
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if (fs.existsSync(path.resolve(configFile))) {
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global.envar = deepmerge(global.envar, require(path.resolve(configFile)))
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console.info(` - ${configFile} is loaded.`)
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} else {
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console.warn(` - ${configFile} is missing.`)
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}
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}
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global.envar.prodev = global.envar.prodev || process.env.NODE_ENV || 'development' // server = require('express')(); server.get('env') === server.settings.env === process.env.NODE_ENV
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if (global.envar.prodev === 'production' && global.envar.ENV_PRODUCTION) {
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console.info('- Applying Production Configuration (加载生产环境配置)')
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global.envar = deepmerge(global.envar, global.envar.ENV_PRODUCTION) // 注意，objectMerge后，产生了一个新的对象，而不是在原来的Config里添加
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delete global.envar.ENV_PRODUCTION
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}
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if (hasCommander) {
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console.info('- Loading Command Line Parameters (载入命令行参数)')
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commander.version(global.envar.Base_Version || '0.0.1', '-v, --version') // 默认是 -V。如果要 -v，就要加 '-v --version'
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for (let [key, param, desc] of global.envar.Commander_Option_List || []) {
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commander.option(param, `${desc} Default = "${global.envar[key]}"`)
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}
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commander.parse(process.argv)
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delete global.envar.Commander_Option_List
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console.log('- Merging Command Line Parameters into Configuration (把命令行参数值合并入配置)')
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for (let key in commander) {
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if (!/^_/.test(key) && typeof commander[key] === 'string') { // commander 自带了一批 _开头的属性，过滤掉
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global.envar[key] = commander[key]
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}
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}
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}
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}
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console.log('>>>>>>>> Configured Environment Variables >>>>>>>>')
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return global.envar
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},
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getDynamicEnvar({dynamicEnvarFile='envar-base-dynamic.js'}={}) { // dynamicEnvarFile should be absolute or relative to the node process's dir.
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const fullpath = path.resolve(dynamicEnvarFile)
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if (fs.existsSync(fullpath)) {
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delete require.cache[require.resolve(fullpath)] // delete require.cache[fullpath] 不起作用
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return require(fullpath)
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} else {
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return {}
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}
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},
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maskSecret({secretEnvarFile='./envar-base-secret.js'}={}) {
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let envar = JSON.parse(JSON.stringify(global.envar)) // 复制一份，避免污染
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if (fs.existsSync(path.resolve(secretEnvarFile))) {
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const secretEnvar = require(path.resolve(secretEnvarFile))
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for (let key in secretEnvar) {
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envar[key] = '****** confidential ******'
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}
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}
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return envar
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}
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}
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