对于appfog我通常使用这段代码：
var host = process.env.VCAP_APP_HOST || "127.0.0.1";
var port = process.env.VCAP_APP_PORT || 1337;
http.createServer(function (req, res) {
// ...
}).listen(port, host);
现在我找到了a very interesting forum software。这是app.js：
'use strict';
/*global global, require, process, module, jsGen, _restConfig*/
var fs = require('fs'),
path = require('path'),
zlib = require('zlib'),
util = require('util'),
http = require('http'),
domain = require('domain'),
serverDm = domain.create(),
processPath = path.dirname(process.argv[1]);
global.jsGen = {}; // 注册全局变量jsGen
jsGen.version = '0.6.6';
serverDm.on('error', function (err) {
delete err.domain;
jsGen.serverlog.error(err);
});
serverDm.run(function () {
jsGen.conf = module.exports.conf = require('./config/config'); // 注册rrestjs配置文件
jsGen.module = {};
jsGen.module.os = require('os');
jsGen.module.xss = require('xss');
jsGen.module.then = require('thenjs');
jsGen.module.marked = require('marked');
jsGen.module.rrestjs = require('rrestjs');
jsGen.module.mongoskin = require('mongoskin');
jsGen.module.nodemailer = require('nodemailer');
jsGen.serverlog = jsGen.module.rrestjs.restlog;
jsGen.lib = {};
jsGen.lib.msg = require('./lib/msg.js');
jsGen.lib.json = require('./lib/json.js');
jsGen.lib.tools = require('./lib/tools.js');
jsGen.lib.email = require('./lib/email.js');
jsGen.lib.redis = require('./lib/redis.js');
jsGen.lib.CacheLRU = require('./lib/cacheLRU.js');
jsGen.lib.converter = require('./lib/anyBaseConverter.js');
jsGen.Err = jsGen.lib.tools.Err;
jsGen.dao = {};
jsGen.dao.db = require('./dao/mongoDao.js').db;
jsGen.dao.tag = require('./dao/tagDao.js');
jsGen.dao.user = require('./dao/userDao.js');
jsGen.dao.index = require('./dao/indexDao.js');
jsGen.dao.article = require('./dao/articleDao.js');
jsGen.dao.message = require('./dao/messageDao.js');
jsGen.dao.collection = require('./dao/collectionDao.js');
jsGen.thenErrLog = function (defer, err) {
jsGen.serverlog.error(err);
};
var redis = jsGen.lib.redis,
then = jsGen.module.then,
each = jsGen.lib.tools.each,
CacheLRU = jsGen.lib.CacheLRU,
extend = jsGen.lib.tools.extend,
resJson = jsGen.lib.tools.resJson,
TimeLimitCache = jsGen.lib.redis.TimeLimitCache;
then(function (defer) {
redis.initConfig(jsGen.lib.json.GlobalConfig, defer); // 初始化config缓存
}).then(function (defer, config) {
jsGen.config = config;
if (!jsGen.config.date) { // config缓存未赋值，则从MongoDB取值
then(function (defer2) {
jsGen.dao.index.getGlobalConfig(defer2);
}).then(function (defer2, config) {
defer2(null, config);
}, function (defer2, err) {
// MongoDB无值，初始化数据库
require('./api/install.js')().then(function () {
defer2(null, jsGen.lib.json.GlobalConfig);
}).fail(defer2);
}).then(function (defer2, config) {
each(jsGen.config, function (value, key, list) {
if (key in config) {
list[key] = config[key]; // 写入config缓存
}
});
defer(null, jsGen.config);
}).fail(defer);
} else {
defer(null, config);
}
}).then(function (defer, config) {
var api = ['index', 'user', 'article', 'tag', 'collection', 'message', 'rebuild'];
jsGen.cache = {};
jsGen.cache.tag = new CacheLRU(config.tagCache);
jsGen.cache.user = new CacheLRU(config.userCache);
jsGen.cache.list = new CacheLRU(config.listCache);
jsGen.cache.article = new CacheLRU(config.articleCache);
jsGen.cache.comment = new CacheLRU(config.commentCache);
jsGen.cache.message = new CacheLRU(config.messageCache);
jsGen.cache.collection = new CacheLRU(config.collectionCache);
jsGen.cache.timeInterval = new TimeLimitCache(config.TimeInterval, 'string', 'interval', false);
jsGen.cache.pagination = new TimeLimitCache(config.paginationCache, 'array', 'pagination', true);
jsGen.robotReg = new RegExp(config.robots || 'Baiduspider|Googlebot|BingBot|Slurp!', 'i');
jsGen.api = {};
each(api, function (x) {
jsGen.api[x] = {}; // 初始化api引用，从而各api内部可提前获取其它api引用
});
each(api, function (x) {
extend(jsGen.api[x], require('./api/' + x + '.js')); // 扩展各api的具体方法
});
fs.readFile(processPath + '/package.json', 'utf8', defer); // 读取软件信息
}).then(function (defer, data) {
data = JSON.parse(data);
data.version = jsGen.version;
data.nodejs = process.versions.node;
data.rrestjs = _restConfig._version;
jsGen.config.info = data;
redis.userCache.index.total(defer); // 读取user缓存
}).then(function (defer, users) {
var rebuild = jsGen.api.rebuild;
if (!users) { // user缓存为空，则判断redis缓存为空，需要初始化
// 初始化redis缓存
then(function (defer2) {
rebuild.user().all(defer2);
}).then(function (defer2) {
rebuild.tag().all(defer2);
}).then(function (defer2) {
rebuild.article().all(defer);
}).fail(defer);
} else {
defer();
}
}).then(function (defer) {
http.createServer(function (req, res) {
var dm = domain.create();
function errHandler(err, res, dm) {
delete err.domain;
try {
res.on('finish', function () {
//jsGen.dao.db.close();
process.nextTick(function () {
dm.dispose();
});
});
if (err.hasOwnProperty('name')) {
res.sendjson(resJson(err));
} else {
jsGen.serverlog.error(err);
res.sendjson(resJson(jsGen.Err(jsGen.lib.msg.MAIN.requestDataErr)));
}
} catch (error) {
delete error.domain;
jsGen.serverlog.error(error);
dm.dispose();
}
}
function router(req, res) {
if (req.path[0] === 'api' && jsGen.api[req.path[1]]) {
jsGen.api[req.path[1]][req.method.toUpperCase()](req, res); // 处理api请求
} else if (req.path[0].toLowerCase() === 'sitemap.xml') {
jsGen.api.article.sitemap(req, res); // 响应搜索引擎sitemap，动态生成
} else if (req.path[0].slice(-3).toLowerCase() === 'txt') {
// 直接响应static目录的txt文件，如robots.txt
then(function (defer) {
fs.readFile(processPath + '/static/' + req.path[0], 'utf8', defer);
}).then(function (defer, txt) {
res.setHeader('Content-Type', 'text/plain');
res.send(txt);
}).fail(res.throwError);
} else if (jsGen.robotReg.test(req.useragent)) {
jsGen.api.article.robot(req, res); // 处理搜索引擎请求
} else {
jsGen.config.visitors = 1; // 访问次数+1
res.setHeader('Content-Type', 'text/html');
if (jsGen.cache.indexTpl) {
res.send(jsGen.cache.indexTpl); // 响应首页index.html
} else {
then(function (defer) {
fs.readFile(processPath + '/static/index.html', 'utf8', defer);
}).then(function (defer, tpl) {
jsGen.cache.indexTpl = tpl.replace(/_jsGenVersion_/g, jsGen.version);
res.send(jsGen.cache.indexTpl);
}).fail(res.throwError);
}
}
}
res.throwError = function (defer, err) { // 处理then.js捕捉的错误
if (!util.isError(err)) {
err = jsGen.Err(err);
}
errHandler(err, res, dm);
};
dm.on('error', function (err) { // 处理domain捕捉的错误
errHandler(err, res, dm);
});
dm.run(function () {
router(req, res); // 运行
});
}).listen(jsGen.module.rrestjs.config.listenPort);
console.log('jsGen start!');
}).fail(function (defer, err) {
throw err;
});
});
您知道如何修改此代码以部署到appfog吗？
答案 0 :(得分：1)
cloudfoundry和auto-reconfiguration支持node.js。所以代码应该在 AppFog 上运行而不做任何修改。
但是，如果要使用这些环境变量，可以先修改行.listen(jsGen.module.rrestjs.config.listenPort);，使其显示为：
.listen(process.env.VCAP_APP_PORT, process.env.VCAP_APP_HOST);