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https://github.com/koajs/koa-redis

Redis storage for Koa session middleware/cache with Sentinel and Cluster support
https://github.com/koajs/koa-redis

cache cluster koa node redis sentinel session storage

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Redis storage for Koa session middleware/cache with Sentinel and Cluster support

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README 

        
# koa-redis



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> Redis storage for Koa session middleware/cache with Sentinel and Cluster support



[![NPM](https://nodei.co/npm/koa-redis.svg?downloads=true)](https://nodei.co/npm/koa-redis/)



**v4.0.0+ now uses `ioredis` and has support for Sentinel and Cluster!**



## Table of Contents



* [Install](#install)

* [Usage](#usage)

  * [Basic](#basic)

  * [Sentinel](#sentinel)

  * [Cluster](#cluster)

* [Options](#options)

* [Events](#events)

* [API](#api)

  * [module(options)](#moduleoptions)

  * [session.get(sid)](#sessiongetsid)

  * [session.set(sid, sess, ttl)](#sessionsetsid-sess-ttl)

  * [session.destroy(sid)](#sessiondestroysid)

  * [session.quit()](#sessionquit)

  * [session.end()](#sessionend)

  * [session.status](#sessionstatus)

  * [session.connected](#sessionconnected)

  * [session.client](#sessionclient)

* [Benchmark](#benchmark)

* [Testing](#testing)

* [License](#license)

* [Contributors](#contributors)



## Install



[npm][]:



```sh

npm install koa-redis

```



[yarn][]:



```sh

yarn add koa-redis

```



## Usage



`koa-redis` works with [koa-generic-session](https://github.com/koajs/generic-session) (a generic session middleware for koa).



For more examples, please see the [examples folder of `koa-generic-session`](https://github.com/koajs/generic-session/tree/master/example).



### Basic



```js

const session = require('koa-generic-session');

const redisStore = require('koa-redis');

const koa = require('koa');



const app = koa();

app.keys = ['keys', 'keykeys'];

app.use(session({

  store: redisStore({

    // Options specified here

  })

}));



app.use(function *() {

  switch (this.path) {

  case '/get':

    get.call(this);

    break;

  case '/remove':

    remove.call(this);

    break;

  case '/regenerate':

    yield regenerate.call(this);

    break;

  }

});



function get() {

  const session = this.session;

  session.count = session.count || 0;

  session.count++;

  this.body = session.count;

}



function remove() {

  this.session = null;

  this.body = 0;

}



function *regenerate() {

  get.call(this);

  yield this.regenerateSession();

  get.call(this);

}



app.listen(8080);

```



### Sentinel



```js

const session = require('koa-generic-session');

const redisStore = require('koa-redis');

const koa = require('koa');



const app = koa();

app.keys = ['keys', 'keykeys'];

app.use(session({

  store: redisStore({

    // Options specified here

    // 

    sentinels: [

      { host: 'localhost', port: 26379 },

      { host: 'localhost', port: 26380 }

      // ...

    ],

    name: 'mymaster'

  })

}));



// ...

```



### Cluster



```js

const session = require('koa-generic-session');

const redisStore = require('koa-redis');

const koa = require('koa');



const app = koa();

app.keys = ['keys', 'keykeys'];

app.use(session({

  store: redisStore({

    // Options specified here

    // 

    isRedisCluster: true,

    nodes: [

      {

        port: 6380,

        host: '127.0.0.1'

      },

      {

        port: 6381,

        host: '127.0.0.1'

      }

      // ...

    ],

    // 

    clusterOptions: {

      // ...

      redisOptions: {

        // ...

      }

    }

  })

}));



// ...

```



## Options



* _all [`ioredis`](https://github.com/luin/ioredis/blob/master/API.md#new-redisport-host-options) options_ - Useful things include `url`, `host`, `port`, and `path` to the server. Defaults to `127.0.0.1:6379`

* `db` (number) - will run `client.select(db)` after connection

* `client` (object) - supply your own client, all other options are ignored unless `duplicate` is also supplied

* `duplicate` (boolean) - When true, it will run `client.duplicate()` on the supplied `client` and use all other options supplied. This is useful if you want to select a different DB for sessions but also want to base from the same client object.

* `serialize` - Used to serialize the data that is saved into the store.

* `unserialize` - Used to unserialize the data that is fetched from the store.

* `isRedisCluster` (boolean) - Used for creating a Redis cluster instance per [`ioredis`][cluster] Cluster options, if set to `true`, then a new Redis cluster will be instantiated with `new Redis.Cluster(options.nodes, options.clusterOptions)` (see [Cluster docs][cluster] for more info).

* `nodes` (array) - Conditionally used for creating a Redis cluster instance when `isRedisCluster` option is `true`, this is the first argument passed to `new Redis.Cluster` and contains a list of all the nodes of the cluster ou want to connect to (see [Cluster docs][cluster] for more info).

* `clusterOptions` (object) - Conditionally used for created a Redi cluster instance when `isRedisCluster` option is `true`, this is the second argument passed to `new Redis.Cluster` and contains options, such as `redisOptions` (see [Cluster docs][cluster] for more info).

* **DEPRECATED:** old options - `auth_pass` and `pass` have been replaced with `password`, and `socket` has been replaced with `path`, however all of these options are backwards compatible.



## Events



See the [`ioredis` docs](https://github.com/luin/ioredis#connection-events) for more info.



**Note that as of v4.0.0 the `disconnect` and `warning` events are removed as `ioredis` does not support them.   The `disconnect` event is deprecated, although it is still emitted when `end` events are emitted.**



## API



These are some the functions that `koa-generic-session` uses that you can use manually. You will need to initialize differently than the example above:



```js

const session = require('koa-generic-session');

const redisStore = require('koa-redis')({

  // Options specified here

});

const app = require('koa')();



app.keys = ['keys', 'keykeys'];

app.use(session({

  store: redisStore

}));

```



### module([options](#options))



Initialize the Redis connection with the optionally provided options (see above). _The variable `session` below references this_.



### session.get(sid)



Generator that gets a session by ID. Returns parsed JSON is exists, `null` if it does not exist, and nothing upon error.



### session.set(sid, sess, ttl)



Generator that sets a JSON session by ID with an optional time-to-live (ttl) in milliseconds. Yields `ioredis`'s `client.set()` or `client.setex()`.



### session.destroy(sid)



Generator that destroys a session (removes it from Redis) by ID. Tields `ioredis`'s `client.del()`.



### session.quit()



Generator that stops a Redis session after everything in the queue has completed. Yields `ioredis`'s `client.quit()`.



### session.end()



Alias to `session.quit()`. It is not safe to use the real end function, as it cuts off the queue.



### session.status



String giving the connection status updated using `client.status`.



### session.connected



Boolean giving the connection status updated using `client.status` after any of the events above is fired.



### session.client



Direct access to the `ioredis` client object.



## Benchmark



| Server                  | Transaction rate      | Response time |

| ----------------------- | --------------------- | ------------- |

| connect without session | **6763.56 trans/sec** | **0.01 secs** |

| koa without session     | **5684.75 trans/sec** | **0.01 secs** |

| connect with session    | **2759.70 trans/sec** | **0.02 secs** |

| koa with session        | **2355.38 trans/sec** | **0.02 secs** |



Detailed benchmark report [here](https://github.com/koajs/koa-redis/tree/master/benchmark)



## Testing



1. Start a Redis server on `localhost:6379`. You can use [`redis-windows`](https://github.com/ServiceStack/redis-windows) if you are on Windows or just want a quick VM-based server.

2. Clone the repository and run `npm i` in it (Windows should work fine).

3. If you want to see debug output, turn on the prompt's `DEBUG` flag.

4. Run `npm test` to run the tests and generate coverage. To run the tests without generating coverage, run `npm run-script test-only`.



## License



[MIT](LICENSE) © dead_horse



## Contributors



| Name           | Website                    |

| -------------- | -------------------------- |

| **dead_horse** |                            |

| **Nick Baugh** |  |



## 



[travis-image]: https://img.shields.io/travis/koajs/koa-redis.svg?style=flat-square



[travis-url]: https://travis-ci.org/koajs/koa-redis



[coveralls-image]: https://img.shields.io/coveralls/koajs/koa-redis.svg?style=flat-square



[coveralls-url]: https://coveralls.io/r/koajs/koa-redis?branch=master



[david-image]: https://img.shields.io/david/koajs/koa-redis.svg?style=flat-square&label=deps



[david-url]: https://david-dm.org/koajs/koa-redis



[david-dev-image]: https://img.shields.io/david/dev/koajs/koa-redis.svg?style=flat-square&label=devDeps



[david-dev-url]: https://david-dm.org/koajs/koa-redis#info=devDependencies



[license-image]: https://img.shields.io/npm/l/koa-redis.svg?style=flat-square



[license-url]: https://github.com/koajs/koa-redis/blob/master/LICENSE



[cluster]: https://github.com/luin/ioredis/blob/master/API.md#new-clusterstartupnodes-options



[npm]: https://www.npmjs.com/



[yarn]: https://yarnpkg.com/