我在游戏中有点晚了，但我在这里或其他地方都找不到我需要的东西，所以我自己写了一些东西。

我对配置机制的要求如下:

支持前端。如果前端不能使用该配置有什么意义? 支持settings-override .js -看起来一样，但允许重写settings.js中的配置。这里的思想是在不更改代码的情况下轻松修改配置。我发现它对saas很有用。

尽管我不太关心支持环境，但它将解释如何轻松地将其添加到我的解决方案中

var publicConfiguration = {
    "title" : "Hello World"
    "demoAuthToken" : undefined, 
    "demoUserId" : undefined, 
    "errorEmail" : null // if null we will not send emails on errors. 

};

var privateConfiguration = {
    "port":9040,
    "adminAuthToken":undefined,
    "adminUserId":undefined
}

var meConf = null;
try{
    meConf = require("../conf/dev/meConf");
}catch( e ) { console.log("meConf does not exist. ignoring.. ")}




var publicConfigurationInitialized = false;
var privateConfigurationInitialized = false;

function getPublicConfiguration(){
    if (!publicConfigurationInitialized) {
        publicConfigurationInitialized = true;
        if (meConf != null) {
            for (var i in publicConfiguration) {
                if (meConf.hasOwnProperty(i)) {
                    publicConfiguration[i] = meConf[i];
                }
            }
        }
    }
    return publicConfiguration;
}


function getPrivateConfiguration(){
    if ( !privateConfigurationInitialized ) {
        privateConfigurationInitialized = true;

        var pubConf = getPublicConfiguration();

        if ( pubConf != null ){
            for ( var j in pubConf ){
                privateConfiguration[j] = pubConf[j];
            }
        }
        if ( meConf != null ){
              for ( var i in meConf ){
                  privateConfiguration[i] = meConf[i];
              }
        }
    }
    return privateConfiguration;

}


exports.sendPublicConfiguration = function( req, res ){
    var name = req.param("name") || "conf";

    res.send( "window." + name + " = " + JSON.stringify(getPublicConfiguration()) + ";");
};


var prConf = getPrivateConfiguration();
if ( prConf != null ){
    for ( var i in prConf ){
        if ( prConf[i] === undefined ){

            throw new Error("undefined configuration [" + i + "]");
        }
        exports[i] = prConf[i];
    }
}


return exports;

解释

undefined means this property is required null means it is optional meConf - currently the code is target to a file under app. meConf is the overrides files which is targeted to conf/dev - which is ignored by my vcs. publicConfiguration - will be visible from front-end and back-end. privateConfiguration - will be visible from back-end only. sendPublicConfiguration - a route that will expose the public configuration and assign it to a global variable. For example the code below will expose the public configuration as global variable myConf in the front-end. By default it will use the global variable name conf. app.get("/backend/conf", require("conf").sendPublicConfiguration);

覆盖逻辑

privateConfiguration与publicConfiguration和meConf合并。 publicConfiguration检查每个键是否有覆盖，并使用该覆盖。这样我们就不会暴露任何隐私。

添加环境支持

即使我不觉得“环境支持”有用，也许有人会。

要添加环境支持，您需要将meConf require语句更改为以下内容(伪代码)

If (environment == "production") { meConf = require("../conf/dev/meConf").production; ｝

If (environment == "development") { meConf = require("../conf/dev/meConf").development; ｝

类似地，每个环境可以有一个文件

 meConf.development.js
 meConf.production.js

然后导入正确的。 其余的逻辑保持不变。

npm i config

In config/default.json
{
    "app": {
        "port": 3000
    },
    "db": {
        "port": 27017,
        "name": "dev_db_name"
    }
}

In config/production.json
{
    "app": {
        "port": 4000
    },
    "db": {
        "port": 27000,
        "name": "prod_db_name"
    }
}

In index.js

const config = require('config');

let appPort = config.get('app.port');
console.log(`Application port: ${appPort}`);

let dbPort = config.get('db.port');
console.log(`Database port: ${dbPort}`);

let dbName = config.get('db.name');
console.log(`Database name: ${dbName}`);

console.log('NODE_ENV: ' + config.util.getEnv('NODE_ENV'));

$ node index.js
Application port: 3000
Database port: 27017
Database name: dev_db_name
NODE_ENV: development

For production
$ set NODE_ENV=production
$ node index.js
Application port: 4000
Database port: 27000
Database name: prod_db_name
NODE_ENV: production

另一个选项是为验证添加模式。像nconf一样，它支持从环境变量、参数、文件和json对象的任何组合中加载设置。

来自README的例子:

var convict = require('convict');
var conf = convict({
  env: {
    doc: "The applicaton environment.",
    format: ["production", "development", "test"],
    default: "development",
    env: "NODE_ENV"
  },
  ip: {
    doc: "The IP address to bind.",
    format: "ipaddress",
    default: "127.0.0.1",
    env: "IP_ADDRESS",
  },
  port: {
    doc: "The port to bind.",
    format: "port",
    default: 0,
    env: "PORT"
  }
});

入门文章: 用节点罪犯驯服构型

很久以后，我发现了一个非常好的Node.js模块来管理配置:nconf。

举个简单的例子:

var nconf = require('nconf');

// First consider commandline arguments and environment variables, respectively.
nconf.argv().env();

// Then load configuration from a designated file.
nconf.file({ file: 'config.json' });

// Provide default values for settings not provided above.
nconf.defaults({
    'http': {
        'port': 1337
    }
});

// Once this is in place, you can just use nconf.get to get your settings.
// So this would configure `myApp` to listen on port 1337 if the port
// has not been overridden by any of the three configuration inputs
// mentioned above.
myApp.listen(nconf.get('http:port'));

它还支持在Redis中存储设置，编写配置文件，并且有一个相当可靠的API，并且还得到了一个更受尊敬的Node.js商店Nodejitsu的支持，作为Flatiron框架计划的一部分，所以它应该是相当经得起未来的。

在Github上查看nconf。

我最近刚刚发布了一个小模块来加载任何类型的配置文件。 它非常简单，你可以在https://github.com/flesler/config-node上查看

您还可以查看node-config，它根据$HOST和$NODE_ENV变量(有点像RoR)加载配置文件:文档。

这对于不同的部署设置(开发、测试或生产)非常有用。