Node.js，在app.configure中表达并使用开发与生产 [英] Node.js, express, and using development versus production in app.configure

问题描述

什么是最简单的方法让我们知道我在做什么环境？例如。我想做下面的连接到redis，取决于我所在的env。可以从命令行完成吗？

What is the easiest method to let express know what environment I am in? E.g. I want do do the below to make a connection to redis depending on what env I am in. Can this be done from the command line?

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
  var r = require("redis").createClient(6379,'127.0.0.1');
});
app.configure('production', function(){
  app.use(express.errorHandler());
  r = redis.createClient(6379,'46.137.195.230', { detect_buffers: true });
});

推荐答案

你的方法没问题，通常，将Redis的配置数据存储在文件中或传递主机和端口，如参数：

Your approach is ok, but you can make something more generic, like storing the config data for Redis in a file or passing the host and port like arguments:

node app.js REDIS_HOST REDIS_PORT

node app.js REDIS_HOST REDIS_PORT

然后在您的应用程序中，您可以使用process.argv来获取它们：

Then in your app you can grab them using process.argv:

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
  var r = require("redis").createClient(process.argv[2], process.argv[3]);
});
app.configure('production', function(){
  app.use(express.errorHandler());
  var r = require("redis").createClient(process.argv[2], process.argv[3], { detect_buffers: true });
});

更新：

Express会知道通过查看NODE_ENV变量（process.env.NODE_ENV），您处于何种环境： https://github.com/visionmedia/express/blob/master/lib/application.js#L55

Express will know in what environment you're in by looking at the NODE_ENV variable (process.env.NODE_ENV): https://github.com/visionmedia/express/blob/master/lib/application.js#L55

您可以设置该变量在启动应用程序时如下所示： NODE_ENV =生产节点app.js （推荐），在您的节点应用程序中手动设置process.env.NODE_ENV，然后才能使用Express代码或放置那个env var在〜/ .profile里面像里卡多那样说。

You can set that variable when starting the app like so: NODE_ENV=production node app.js (recommended), setting process.env.NODE_ENV manually in your node app before the Express code or putting that env var in ~/.profile like Ricardo said.

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