IBM research mixin for Loopback Models

Some mixins used in IBM research apps that use Loopback. This module is designed for the Strongloop Loopback framework.

Mixins

• PostMethod: It automatically adds a remote method for update an instance of any model through a POST /MyModel/<id>.
• ModelCache: Create a cache for find methods in model (memory or redis).
• SpamControl: Create a basic spam control for intances creation.
• Timestamp: Add timestamp properties for models and set automatically.

Installation

You can put me in your package.json dependencies. The npm tool can do this for you, from the command line:

$ npm install --save loopback-ibmresearch-mixin

Configuration

Postmethod mixin

It automatically adds a remote method for update an instance of any model through a POST /MyModel/<id>.

• assignProperties If true, it will assign instance properties instead of merging.

ModelCache mixin

Create a cache for find methods in model (memory or redis).

• ttl: Time to live of the cache in seconds (default 30).
• reloadAfterReturn: After return from cache (the DB method will be fired and reload cache. default: true).
• invalidateCacheAfterSave: If true, the cache will be invalidated after save any instance of the model.
• invalidateCacheAfterDelete: If true, the cache will be invalidated after delete any instance of the model.
• disableDefault: Disable cache in find method (default false)
• methods: Array of remote methods that will be cached too.
• type: Backend type ('memory' or 'redis'). Default value is 'memory'.
• configuration: Configuration of the backend.

SpamControl mixin

Add a simple spam control for multiple creations of instances. This mixin disable instance creation of a model (and user) for a specified time after create one.

• ttl: Time to wait to create a new instance in seconds (default 30).
• unique: Only access to this model will be checked (default true).
• errorCode: ErrorCode to generate if spam detected (next({code: errorCode})).
• type: Backend type ('memory' or 'redis'). Default value is 'memory'.
• configuration: Configuration of the backend.

Timestamp mixin

• createdAt: Name of the property for createdAt attribute (default: 'createdAt').

• modifiedAt: Name of the property for attribute (default: 'modifiedAt').

• required: Indicates if the previous attributes are required for the model (default: false).

• history: (WIP - Work In Progress) If true indicates that the modifiedAt attribute is a object with an history of modifications with time and user (anonymous or userId) that made the change:

    {
       ...
       "modifiedAt": {
         "1478000538364": "anonymous",
         "1478000231241": "anonymous",
         "1478000198352": "1"
       },
       ...
    }
  

If history is set to false:

{
  ...
  "createdAt": "2016-11-01T10:02:34.794Z",
  "modifiedAt": "2016-11-01T10:20:34.794Z",
  ...
}

model-config.json

Add the mixins property to your server/model-config.json:

{
  "_meta": {
    "sources": [
      "loopback/common/models",
      "loopback/server/models",
      "../common/models",
      "./models"
    ],
    "mixins": [
      "loopback/common/mixins",
      "../node_modules/loopback-ibmresearch-mixin/lib",
      "../common/mixins"
    ]
  }
}

Model config

To use with your Models add the mixins attribute to the definition object of your model config.

  {
    "name": "MyModel",
    "properties": {
      "name": {
        "type": "string",
      }
    },
    "mixins": {
      "PostMethod": {
        "assignProperties": false
      },
      "ModelCache": {
        "ttl": 40,
        "reloadAfterReturn": true,
        "methods": [ "myRemoteMethod" ]
      },
      "SpamControl": {
        "ttl": 50,
        "type": "redis",
        "configuration": {
          "host": "xxx",
          "password": "xxx",
          "port": "xxx",
          "dbNumber": "x"
        }
      },
      "Timestamp": {
        "history": false
      }
    }
  }

Configure programatically

In server/boot folder of the loopback app.

var postMethod = require('loopback-ibmresearch-mixin/lib/postMethod');
var modelCache = require('loopback-ibmresearch-mixin/lib/modelCache');
var spamControl = require('loopback-ibmresearch-mixin/lib/spamControl');
var timestamp = require('loopback-ibmresearch-mixin/lib/timestamp');

module.exports = function(app) {

  var options = {
    ttl: 5,
    methods: [ 'myRemoteMethod' ]
  };

  modelCache(app.models.MyModel, options);
  postMethod(app.models.MyModel);
  spamControl(app.models.MyModel);
  timestamp(app.models.MyModel);

};

Debug

For debug use:

DEBUG=loopback:ibmresearch:mixins:* npm start

LICENSE

MIT License

Copyright (c) 2016 IBM Research Emergent Solutions

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MIT