koa2-session-ioredis

Redis storage for koa session middleware/cache using ioredis.

Installation

npm i koa2-session-ioredis ioredis --save

Usage

koa2-session-ioredis works with koa-session (a session middleware for koa v2).

Example

1const session = require('koa-session');
2const RedisStore = require('koa2-session-ioredis');
3const Koa = require('koa');
4
5const app = new Koa();
6app.keys = ['keys', 'keykeys'];
7app.use(session({
8  key: 'koa:sess', /** (string) cookie key (default is koa:sess) */
9  /** (number || 'session') maxAge in ms (default is 1 days) */
10  /** 'session' will result in a cookie that expires when session/browser is closed */
11  /** Warning: If a session cookie is stolen, this cookie will never expire */
12  maxAge: 86400000,
13  overwrite: true, /** (boolean) can overwrite or not (default true) */
14  httpOnly: true, /** (boolean) httpOnly or not (default true) */
15  signed: true, /** (boolean) signed or not (default true) */
16  rolling: false, /** (boolean) Force a session identifier cookie to be set on every response. The expiration is reset to the original maxAge, resetting the expiration countdown. (default is false) */
17  renew: false, /** (boolean) renew session when session is nearly expired, so we can always keep user logged in. (default is false)*/
18  store: new RedisStore({
19    // Options specified here
20    // all `ioredis` options
21  })
22}, app));
23
24app.use(async ctx => {
25  switch (ctx.path) {
26  case '/get':
27    get.call(this);
28    break;
29  case '/remove':
30    remove.call(this);
31    break;
32  case '/regenerate':
33    await regenerate.call(this);
34    break;
35  }
36});
37
38function get() {
39  var session = this.session;
40  session.count = session.count || 0;
41  session.count++;
42  this.body = session.count;
43}
44
45function remove() {
46  this.session = null;
47  this.body = 0;
48}
49
50async function regenerate() {
51  get.call(this);
52  await this.regenerateSession();
53  get.call(this);
54}
55
56app.listen(8080);

For more examples, please see the examples folder of koa-session.

Options

• all ioredis options
• Useful things include host, port, and path to the server. Defaults to 127.0.0.1:6379
• 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(options) 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.

Events

See the ioredis docs for more info.

• ready
• connect
• reconnecting
• error
• end
• close
• idle

API

These are some the funcitons that koa-session uses that you can use manually. You will need to inintialize differently than the example above:

1const session = require('koa-session');
2const redisStore = require('koa2-session-ioredis')({
3  // Options specified here
4});
5const app = require('koa')();
6
7app.keys = ['keys', 'keykeys'];
8app.use(session({
9  //... other options
10  store: new redisStore()
11}, app));

module([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. Yields 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 of the queue.

session.status

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

• connecting
• connect
• ready
• reconnecting
• end
• monitoring

session.client

Direct access to the ioredis client.

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

Testing

1. Start a Redis server on localhost:6379. You can use 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.

Authors

See the contributing tab

Licences

(The MIT License)

Copyright (c) 2015 dead-horse and other contributors

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.