这是为了帮助其他人，他们可能会发现自己处于与我类似的情况.我希望它能标准化.我不认为每次有人需要开发多租户应用程序时，我们都需要重新设计轮子.
本例描述了一种多租户 struct ，每个客户机都有自己的数据库.
以下是本解决方案的目标:
- 每个客户端都由子域标识，例如client1.应用通用域名格式，
- 应用程序判断子域是否有效，
- 应用程序从主数据库中查找并获取连接信息(数据库url、凭据等)，
- 应用程序连接到客户端数据库(基本上交给客户端)，
- 应用程序采取措施确保完整性和资源管理(例如，对同一客户端的成员使用相同的数据库连接，而不是建立新连接).
这是密码
在你的app.js档案里
app.use(clientListener()); // checks and identify valid clients
app.use(setclientdb());// sets db for valid clients
我创建了两个中间件:
clientListener-要识别正在连接的客户端，setclientdb-在识别客户机后，从主数据库获取客户机详细信息，然后建立到客户机数据库的连接.
clientListener中间件
我通过判断请求对象的子域来判断客户机是谁.我做了一系列判断以确保客户机是有效的(我知道代码很乱，可以更干净).确保客户端有效后，我将客户端信息存储在会话中.我还判断，如果客户端信息已经存储在会话中，则无需再次查询数据库.我们只需要确保请求子域与会话中已存储的子域相匹配.
var Clients = require('../models/clients');
var basedomain = dbConfig.baseDomain;
var allowedSubs = {'admin':true, 'www':true };
allowedSubs[basedomain] = true;
function clientlistener() {
return function(req, res, next) {
//console.dir('look at my sub domain ' + req.subdomains[0]);
// console.log(req.session.Client.name);
if( req.subdomains[0] in allowedSubs || typeof req.subdomains[0] === 'undefined' || req.session.Client && req.session.Client.name === req.subdomains[0] ){
//console.dir('look at the sub domain ' + req.subdomains[0]);
//console.dir('testing Session ' + req.session.Client);
console.log('did not search database for '+ req.subdomains[0]);
//console.log(JSON.stringify(req.session.Client, null, 4));
next();
}
else{
Clients.findOne({subdomain: req.subdomains[0]}, function (err, client) {
if(!err){
if(!client){
//res.send(client);
res.send(403, 'Sorry! you cant see that.');
}
else{
console.log('searched database for '+ req.subdomains[0]);
//console.log(JSON.stringify(client, null, 4));
//console.log(client);
// req.session.tester = "moyo cow";
req.session.Client = client;
return next();
}
}
else{
console.log(err);
return next(err)
}
});
}
}
}
module.exports = clientlistener;
setclientdb中间件:
我再次判断所有内容，确保客户有效.然后，使用从会话检索到的信息打开与客户机数据库的连接.
我还确保将所有活动连接存储到一个全局对象中，以防止每次请求时都有新的数据库连接(我们不想让每个客户端mongodb服务器的连接过载).
var mongoose = require('mongoose');
//var dynamicConnection = require('../models/dynamicMongoose');
function setclientdb() {
return function(req, res, next){
//check if client has an existing db connection /*** Check if client db is connected and pooled *****/
if(/*typeof global.App.clientdbconn === 'undefined' && */ typeof(req.session.Client) !== 'undefined' && global.App.clients[req.session.Client.name] !== req.subdomains[0])
{
//check if client session, matches current client if it matches, establish new connection for client
if(req.session.Client && req.session.Client.name === req.subdomains[0] )
{
console.log('setting db for client ' + req.subdomains[0]+ ' and '+ req.session.Client.dbUrl);
client = mongoose.createConnection(req.session.Client.dbUrl /*, dbconfigoptions*/);
client.on('connected', function () {
console.log('Mongoose default connection open to ' + req.session.Client.name);
});
// When the connection is disconnected
client.on('disconnected', function () {
console.log('Mongoose '+ req.session.Client.name +' connection disconnected');
});
// If the Node process ends, close the Mongoose connection
process.on('SIGINT', function() {
client.close(function () {
console.log(req.session.Client.name +' connection disconnected through app termination');
process.exit(0);
});
});
//If pool has not been created, create it and Add new connection to the pool and set it as active connection
if(typeof(global.App.clients) === 'undefined' || typeof(global.App.clients[req.session.Client.name]) === 'undefined' && typeof(global.App.clientdbconn[req.session.Client.name]) === 'undefined')
{
clientname = req.session.Client.name;
global.App.clients[clientname] = req.session.Client.name;// Store name of client in the global clients array
activedb = global.App.clientdbconn[clientname] = client; //Store connection in the global connection array
console.log('I am now in the list of active clients ' + global.App.clients[clientname]);
}
global.App.activdb = activedb;
console.log('client connection established, and saved ' + req.session.Client.name);
next();
}
//if current client, does not match session client, then do not establish connection
else
{
delete req.session.Client;
client = false;
next();
}
}
else
{
if(typeof(req.session.Client) === 'undefined')
{
next();
}
//if client already has a connection make it active
else{
global.App.activdb = global.App.clientdbconn[req.session.Client.name];
console.log('did not make new connection for ' + req.session.Client.name);
return next();
}
}
}
}
module.exports = setclientdb;
最后但并非最不重要
因为我使用的是mongoose和原生mongo的组合，所以我们必须在运行时编译我们的模型.请看下面
把这个加到你的app.js
// require your models directory
var models = require('./models');
// Create models using mongoose connection for use in controllers
app.use(function db(req, res, next) {
req.db = {
User: global.App.activdb.model('User', models.agency_user, 'users')
//Post: global.App.activdb.model('Post', models.Post, 'posts')
};
return next();
});
说明:
正如我前面所说，我创建了一个全局对象来存储活动数据库连接对象:global.App.activdb
然后，我使用这个连接对象创建(编译)mongoose模型，然后将其存储在req对象的db属性中:req.db.我这样做是为了在我的控制器中访问我的模型，例如.
我的用户控制器示例:
exports.list = function (req, res) {
req.db.User.find(function (err, users) {
res.send("respond with a resource" + users + 'and connections ' + JSON.stringify(global.App.clients, null, 4));
console.log('Worker ' + cluster.worker.id + ' running!');
});
};
我最终会回来清理的.如果有人想帮我，那就太好了.