sails-hook-multitenant

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sails-hook-multitenant

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A multitenant Sails.js 1.X hook for Waterline ORM.

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## 1. Introduction
Sails Multitenant ORM Project was develop to give to Waterline ORM , The main ORM implemented in Sails 1.X, the capability to use the Multi Tenant Arquitecture.

This is a none invasive method, because is a plug & play hook, made to follow the hook specifications provided by sails to add a group of functions that transform the traditional ORM into a multitenancy ORM with full compatibility with traditional operations with a single tenant.

Sails Multitanency ORM project is perfect for any new app that needs a multi tenant arquitecture or if you have an app that needs multi tenant database operations, because you don't need to modify anything if you have code made with the traditional methods provided by the Sails.js Framework.

Try Sails Multitenant ORM Project and put steroids in your Waterline ORM.

## 2. Get started

You need npm or yarn to install the hooks into your Sails app.

```bash
# To install with npm
npm install sails-hook-multitenant --save
# To install with yarn
yarn add sails-hook-multitenant --save
```
If you start from scratch and want to created a new sails project with multitenant hook

```bash
# Create a new sails project
sail new project_name
# Enter to project
cd project_name
# To install with npm
npm install sails-hook-multitenant --save
# To install with yarn
yarn add sails-hook-multitenant --save
# Lift your app
sails lift
```
## 3. Configuration

The hook comes ready to use, but if you use the Request object to determine the tenant in the requests, you need to define a tenant selector function into Sails configuration folder. Use and extend the next code to write your own tenant selection function in order to use the Request Object in tenants requests.

```javascript
module.exports.multitenancy = function(req){
    // The function need return a Promise to select the tenant
    return new Promise(async (resolve, reject) => {
        // The code was here
        // If you want use a database, redis or file
        // you can be here.
        // ....
        // ....
        // You need return a object with the tenant information with the next structure
        // const datasourse = {
        //   "host": #####, (String - The host of datasource)
        //   "port": #####, (Number - The port of datasource)
        //   "schema": ######, (Boolean - Determine if the datasource use schameas 
        //   in the tables or is a schamless datasource)
        //   "adapter": ######, (String - Indicates the driver use for 
        //   the datasource. Example: sails-mysql) 
        //   "user": ######, (String - Indicates the user of datasource)
        //   "password": ######, (String - Indicates the password of datasource)
        //   "database": ######, (String - Indicates the name of database in datasource)
        //   "identity": ###### (String - Indicate the name of datasource)
        // }
        //
        // ********************************************************
        // Or you can use the datasource object provided by the hook
        // Import to use in the function
        // const _datasource = require('sails-hook-multitenant/datasource');
        // ....
        // ....
        // const datasource = new _datasource(host, port, schema, adapter,
        // user, password, database, identity);
        // ....
        resolve(datasource);
    });
}
```
Save this code into sails configurtion folder with a name you want, **Example** tenancy.js

## 4. How to use

The hook was built with three different use cases in mind. Each way to use the multi tenant hook make an datasource change by tenant. All models, that want to use the multi tenant datasource should have a multitenant boolean property equal to true `multitenant: true` defined in the Model Object in order to be a multitenant model. If this propertie does not exist, the hook ignores this model of multitenant call. **An example:**

```javascript
/**
 * Client.js
 *
 * @description :: A model definition.  Represents a database table/collection/etc.
 * @docs        :: https://sailsjs.com/docs/concepts/models-and-orm/models
 */

module.exports = {

attributes: {
    name: 'string',
    age: 'number'
    //  ╔═╗╦═╗╦╔╦╗╦╔╦╗╦╦  ╦╔═╗╔═╗
    //  ╠═╝╠╦╝║║║║║ ║ ║╚╗╔╝║╣ ╚═╗
    //  ╩  ╩╚═╩╩ ╩╩ ╩ ╩ ╚╝ ╚═╝╚═╝

//  ╔═╗╔╦╗╔╗ ╔═╗╔╦╗╔═╗
    //  ║╣ ║║║╠╩╗║╣  ║║╚═╗
    //  ╚═╝╩ ╩╚═╝╚═╝═╩╝╚═╝

//  ╔═╗╔═╗╔═╗╔═╗╔═╗╦╔═╗╔╦╗╦╔═╗╔╗╔╔═╗
    //  ╠═╣╚═╗╚═╗║ ║║  ║╠═╣ ║ ║║ ║║║║╚═╗
    //  ╩ ╩╚═╝╚═╝╚═╝╚═╝╩╩ ╩ ╩ ╩╚═╝╝╚╝╚═╝

},
  multitenant: true
};

```
If you define you model like multitenant, you have three ways to make multitenant database calls.

### 4.1 The Request Object Way

This way is based on the request object handler by each action in the controllers. Each ORM operations is called using the first argument, the Request Object. The hook automatically recognizes this object and uses the argument **Tenant selector function** previusly configured in the Sails configuration folder.

The **Tenant selector function** returns a configuration object that selects and configures the tenant. If the tenant was previsuly used, the hook will not create a new datasource of this tenant and only uses the datasource previusly created.

An example of this, with the Client model previusly defined.

```javascript
/**
 * ClientController
 *
 * @description :: Server-side actions for handling incoming requests.
 * @help        :: See https://sailsjs.com/docs/concepts/actions
 */

/*****************************************************************/
/* Briefing:                                                     */ 
/* The default database configured in datasource is "multitenant"*/
/* "client1" database is a tenant database asociate to           */
/* client1.rockstart.com domain. The tenant database call need   */
/* use the datasource asign to this domain.                      */
/*****************************************************************/
module.exports = {
  
    find: async function(req, res) {
        // To make this posible the Req object have the domain and can be 
        // associate this domain to select the datasource. In this case we
        // utilized the Request Object Way.
        const client = await Client.create(req, {
            name: 'client1',
            edad: 24
        });
        // Call all the clients in the tenant (In this example only one
        // register)
        const clients = await Client.find(req);
        // A normal call to "multitenant" database with the same table
        // But this table is empty
        const test = await Client.find();
        return res.ok({
            client: clients,
            compare: test
        });
    }
};
```
The configuration function should be:

```javascript
/******************************************************************/
/* Briefing:                                                      */ 
/* The default database configured in datasource is "multitenant" */
/* have a table with all Tenant named Tenants. We created a model */
/* Tenant to get the tenants based on the domain.                 */
/*                                                                */
/******************************************************************/
const Datasource = require('sails-hook-multitenant/datasource');

module.exports.multitenancy = function(req){
    // We call the tenants model defined in our sails app
    const Tenants = sails.models.tenants;
    // this function require return a Promise
    return new Promise(async (resolve, reject) => {
        // Search the tenant in the database based on the domain identifier
        const datasource = await Tenants.findOne({
            identity: req.hostname
        });
        // Return a Datasource object
        resolve(new Datasource(datasource));
    });
}
```

The Tenant Model should be:

```javascript
/**
 * Tenants.js
 *
 * @description :: A model definition.  Represents a database table/collection/etc.
 * @docs        :: https://sailsjs.com/docs/concepts/models-and-orm/models
 */

module.exports = {

attributes: {
    host: 'string',
    port: 'number',
    schema: 'boolean',
    adapter: 'string',
    user: 'string',
    password: 'string',
    database: 'string',
    identity: 'string'
  },
};
```
The result of call the controller should be:

```javascript
{
    // The array with the client table in the database configured dinamically by the multitenant hook
    client: [
        {
        "name": "client1",
        "age": 24
        }
    ],
    // The array with the client table in the database configured in sails datasource. Should be 0 regsiters
    compare: []
}
```

### 4.2 The configuration Object Way

This way is similar to Request Object but the selection of the tenant is handled directly from the controller. The database operations is made with the configuration datasource object all the time.

An example of this, with the Client model previusly defined.

```javascript
/**
 * ClientController
 *
 * @description :: Server-side actions for handling incoming requests.
 * @help        :: See https://sailsjs.com/docs/concepts/actions
 */

/******************************************************************/
/* Briefing:                                                      */ 
/* The default database configured in datasource is "multitenant" */
/* "client1" database is a tenant database asociate to a client1  */
/*                                                                */
/******************************************************************/
const Datasource = require('sails-hook-multitenant/datasource');

module.exports = {
  
    find: async function(req, res) {
        // To make this posible we need create a Datasource configuration
        // Object
        const datasource = new Datasource('localhost', 3306, true,
        'sails-mysql', 'user', 'password', 'client1', 'client1');
        const client = await Client.create(datasource, {
            name: 'client1_config',
            edad: 27
        });
        // Call all the clients in the tenant (In this example only one
        // register)
        const clients = await Client.find(datasource);
        // A normal call to 'multitenant' database with the same table
        // But this table is empty
        const test = await Client.find();
        return res.ok({
            client: clients,
            compare: test
        });
    }
};
```
The result of call the controller should be:

```javascript
{
    // The array with the client table in the database configured dinamically by the multitenant hook
    client: [
        {
        "name": "client1_config",
        "age": 27
        }
    ],
    // The array with the client table in the database configured in sails datasource. Should be 0 regsiters
    compare: []
}
```

### 4.3 The Datasource creation Way

This way is similar to Configuration Object but the selection of the tenant is by the name of datasource. To make this posible previusly to database operation call we need to add the datasource to the models. The database operations is made with the name of datasource in each operation.

An example of this, with the Client model previusly defined.

```javascript
/**
 * ClientController
 *
 * @description :: Server-side actions for handling incoming requests.
 * @help        :: See https://sailsjs.com/docs/concepts/actions
 */

/******************************************************************/
/* Briefing:                                                      */ 
/* The default database configured in datasource is "multitenant" */
/* "client1" database is a tenant database asociate to a client1  */
/*                                                                */
/******************************************************************/
const Datasource = require('sails-hook-multitenant/datasource');

module.exports = {
  
    find: async function(req, res) {
        // To make this posible we need add datasource previusly to use.
        await Client.addDatasource('client1', {
            'host': 'localhost', 
            'port': 3306, 
            'schema': true,
            'adapter': 'sails-mysql',
            'user': 'user', 
            'password': 'password', 
            'database': 'client1' 
        });
        // Call the database operation with the identifyer
        const client = await Client.create('client1', {
            name: 'client1_add_datasource',
            edad: 27
        });
        // Call all the clients in the tenant (In this example only one
        // register)
        const clients = await Client.find('client1');
        // A normal call to "multitenant" database with the same table
        // But this table is empty
        const test = await Client.find();
        return res.ok({
            client: clients,
            compare: test
        });
    }
};
```
The result of call the controller should be:

```javascript
{
    // The array with the client table in the database configured dinamically by the multitenant hook
    client: [
        {
        "name": "client1_add_datasource",
        "age": 27
        }
    ],
    // The array with the client table in the database configured in sails datasource. Should be 0 regsiters
    compare: []
}
```

## 5. Lifecycle Callbacks

When you use multitenant call of model, the lifecycle callbacks can receive three parameters. The third parameter is
request object of the http request that you can use to handle new multitenancy calls in models.

```javascript
// Create Lifecycle callbacks
beforeCreate(newRecord, proceed, req);
afterCreate(newRecord, proceed, req);

// Update Lifecycle callbacks
beforeUpdate(newRecord, proceed, req);
afterCreate(newRecord, proceed, req);

// Destroy Lifecycle callbacks
beforeDestroy(newRecord, proceed, req);
afterDestroy(newRecord, proceed, req);

```

## 6. Native Queries

The hook support native queries in each adapters that can support sendNativeQuery Method.

To use native query method in the datastore, we can use the same ways used in the ORM methods to interact with database using the three posible ways to handle multitenancy shown in this hook.

To use native queries you can use this ways, if you want use request object.

```javascript
let QUERY = "SELECT * FROM test_table";

// Using native queries from sails object, using request object
let query = await sails.sendNativeQuery(req, QUERY);

// Using native queries from model, using request object
// Test is a declared Sails Model. 
let query = Test.getDatastore().sendNativeQuery(req, QUERY);

```

If you want to use Datasource creation or Configuration object Way, you can use them like a Multi Tenancy model action, replacing request object with the with the corresponding variables.

## 7. Examples
An example project for study is in the example folder.

If you have any question of how to use, or any question, please contact.

## 8. Tests
Follow the Sails documentation, the hook is tested with mocha.

```bash
# If you use npm
npm install mocha -g
# if you use yarn
yarn install mocha -g

# Testing the hook
mocha -R spec 
```
This command should be print the follow output.

```bash
  Basic tests ::

==========================================================
 _____   _____   _   _     _____     __  __   _____
|  ___| |  _  | | | | |   |  ___|   |  \/  | |_   _|
| |___  | |_| | | | | |   | |___    |      |   | |
|____ | |  _  | | | | |   |____ |   | |\/| |   | |
 ___| | | | | | | | | |__  ___| |   | |  | |   | |
|_____| |_| |_| |_| |____||_____|   |_|  |_|   |_|

Waterline Multitenant ORM Project
License: MIT
Git: https://www.github.com/acalvoa/sails-hook-multitenant

==========================================================
    ✓ sails does not crash

1 passing (496ms)

```

## 9. Contributors
Thanks to all people that can do this possible.


| [<img src="https://avatars3.githubusercontent.com/u/26884109?s=460&v=4" width="100px;"/> Raquel](https://github.com/raqem) [🌍](#question-kentcdodds "Answering Questions") | 
| :---: |

**Knownledge is power, share the Knownledge.**

## 10. License
This project is develop by Parley for free use by the community, under MIT license.

Made with ❤ in Chile

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