LoopBack：如何在代码中动态创建自定义REST端点（即时） [英] LoopBack: How to Dynamically Create Custom REST Endpoints In Code (On The Fly)

问题描述

我们正在使用LoopBack REST框架来公开我们的数据库（和业务逻辑）。我们需要允许我们的客户在数据库（单和多租户）中创建可以通过REST端点访问的自定义表。所有客户都需要使用相同的通用（生产）REST端点，这些端点将暴露在多个服务器上。但是，只有创建它们的客户才能访问自定义表和关联的REST端点。这意味着我们无法将自定义表的模型写入光盘。我们需要能够在我们的生产REST端点的上下文中即时创建一个实际的REST端点。

问题：我们如何动态创建自定义REST端点代码（即时），而不将模型写入光盘上的JSON文件？

解决方案

您可以在模型的JS文件中创建远程方法，这样在运行时添加API钩子，尽管它在启动时。也就是说，我想你可以使用相同的功能来添加任何时候的端点，而不仅仅是在启动时（尽管我从未尝试过）：

Inside /common/models/MyModel.js

  module.exports = function（MyModel） {
 
 //这是创建端点的端点... 
 MyModel.addEndpoint = function（name，method，cb）{
 // audit name and method .. 
 
 MyModel [name] = function（options，newCb）{
 //做任何这个端点应该做的... 
 newCb（null，'新的端点成功！ ）; 
}; 
 
 MyModel.remoteMethod（
 name，
 {
接受：[{arg：'options'，type：'object'}]，//或者你需要... 
返回：{arg：'message'，键入：'string'}，//无论它返回... 
 http：{动词：方法} 
} 
）; 
 
 cb（null，'创建新的端点！'）; 
}; 
 
 MyModel.remoteMethod（
'addEndpoint'，
 {
接受：[
 {arg：'name'，type：'string'，http ：{source：'body'}}，
 {arg：'method'，type：'string'，http：{source：'body'}} 
]，
返回： arg：'message'，键入：'string'}，
 http：{动词：'post'} 
} 
）; 
}; 
  

We are using the LoopBack REST framework to expose our database (and business logic). We need to allow our customers to create custom tables in the database (single and multi-tenant) which can be accessed via a REST endpoint. All customers need to use the same common (production) REST endpoints which will be on exposed on multiple servers. However, custom tables and associated REST endpoints need to be accessible to only the customers that created them. Which means we cannot write the model for custom tables to disc. We need to be able to create an actual REST endpoint on the fly within the context of our production REST endpoints.

Question: How can we dynamically create custom REST endpoints in-code (on the fly) without writing the model to a JSON file on-disc?

解决方案

You can create a "remote method" within a model's JS file, this adds the API hook "at runtime", although it is at startup. That said, I think you could use the same functions to add the endpoint any time, not just at startup (although I've never tried):

Inside /common/models/MyModel.js

module.exports = function(MyModel){

  // This is the endpoint for creating endpoints...
  MyModel.addEndpoint = function(name, method, cb) {
    // audit name and method...

    MyModel[name] = function(options, newCb) {
      // do whatever this endpoint should do...
      newCb(null, 'New endpoint success!');
    };

    MyModel.remoteMethod(
      name, 
      {
        accepts: [{arg: 'options', type: 'object'}], // or whatever you need...
        returns: {arg: 'message', type: 'string'}, // whatever it returns...
        http: {verb: method}
      }
    );

    cb(null, 'Success creating new endpoint!');
  };

  MyModel.remoteMethod(
    'addEndpoint', 
    {
      accepts: [
        {arg: 'name', type: 'string', http: {source: 'body'}},
        {arg: 'method', type: 'string', http: {source: 'body'}}
      ],
      returns: {arg: 'message', type: 'string'},
      http: {verb: 'post'}
    }
  );
};

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