Redis node.js - 链接调用以获取用户数据 [英] Redis node.js - chaining calls to get user data

问题描述

我有一个用户数据库：用户可以拥有的配置文件，产品，配置和其他内容。我试图找出一种方法来成功连接我的redis调用（一个getAll函数），以便我可以返回一个所有这些东西的对象，如：

  user = {
个人资料：{}，
产品：{}，
 config：{}，
 ... 
} 
  

这是我如何访问/我正在尝试做什么： / p>

  User.getAll = function（uid，next）{
 
 var user = {}; 
 var multi = client.multi（）; 
 
 var key ='user'+ uid; 
 client.hgetall（key，function（err，profile）{
 user.profile = profile; 
 //指示配置文件准备就绪
} 
 
 key ='products：'+ uid; 
 client.smembers（key，function（err，arr）{
 key = key +'：'; 
 for（i = 0; i < arr.length; i ++）{
 multi.hgetall（key + arr [i]）; 
} 
 multi.exec（function（err，products）{
 user $ product 
 
 
 if（ready）{//显然这不是正确。 
 return next（null，user）; 
} 
} 
  

在收到所有我想要的数据？事件发射器是正确的方法吗？

解决方案

我认为事件发射器在这里不是一个好选择。您可以跟踪所有的电话，如下所示：

  User.getAll = function（uid，next）{
 var requests = [first，second]; 
 var check_request = function（_key）{
 var idx = requests.indexOf（_key）; 
 if（idx！==  -  1）{
 requests.splice（idx，1）; 
} 
 if（！requests.length）{
 next（user）; 
} 
}; 
 
 // ORIGINAL CODE + check_request 
 var user = {}; 
 var multi = client.multi（）; 
 
 var key ='user'+ uid; 
 client.hgetall（key，function（err，profile）{
 user.profile = profile; 
 check_request（first）; 
} 
 
 key ='products：'+ uid; 
 client.smembers（key，function（err，arr）{
 key = key +'：'; 
 for（i = 0; i < arr.length; i ++）{
 multi.hgetall（key + arr [i]）
} 
 multi.exec（function（err，products）{
 user。 product = products; 
 check_request（second）; 
}））; 
}）
} 
  

显然，你会使用更有意义的东西，然后在 requests = [first，second]; 我希望你能得到这个想法。

另请参阅 async.js 。这是一个很好的图书馆，为您简化，它可以做得更多。

I have a database of users: profiles, products, configurations, and other things that a user could own. I'm trying to figure out a way to successfully chain my redis calls (a "getAll" function) so that I can return an object with all of these things, like:

user = {
    profile: {},
    products: {},
    config: {},
    ...
}

Here is how I'm accessing them/ what I'm trying to do:

User.getAll = function(uid, next){

    var user = {};
    var multi = client.multi();

    var key = 'user' + uid;
    client.hgetall(key, function(err, profile){
        user.profile = profile;
        //signal that profile is ready
    }

    key = 'products:' + uid;
    client.smembers(key, function(err, arr){
        key = key + ':';
        for (i=0; i < arr.length; i++){
            multi.hgetall(key + arr[i]);
        }
        multi.exec(function(err, products){
            user.products = products;
            //signal that products is ready
        }));
    })

    if (ready) { //obviously this isn't correct.
      return next(null, user);
    }
}

How can I resume after I've received all the data I want? Is event emitter the right way to go?

解决方案

I think that event emitter won't be a good choice here. You can keep track of all the calls, like that:

User.getAll = function(uid, next){
    var requests = ["first", "second"];
    var check_request = function(_key) {
        var idx = requests.indexOf(_key);
        if (idx!==-1) {
            requests.splice(idx, 1);
        }
        if (!requests.length) {
            next(user);
        }
    };

    // ORIGINAL CODE + check_request
    var user = {};
    var multi = client.multi();

    var key = 'user' + uid;
    client.hgetall(key, function(err, profile){
        user.profile = profile;
        check_request("first");
    }

    key = 'products:' + uid;
    client.smembers(key, function(err, arr){
        key = key + ':';
        for (i=0; i < arr.length; i++){
            multi.hgetall(key + arr[i])
        }
        multi.exec(function(err, products){
            user.products = products;
            check_request("second");
        }));
    })
}

Obviously you will use something that makes more sense then requests = ["first", "second"];, but I hope you get the idea.

Also have a look at async.js. It's a nice library which simplify that for you and it can do much more.

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