Redis JavaScript Emulator mocking
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stipsan

Description

Emulates ioredis by performing all operations in-memory.

166 Stars 71 Forks MIT License 832 Commits 32 Opened issues

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ioredis-mock · npm npm version Redis Compatibility: 61% semantic-release

This library emulates ioredis by performing all operations in-memory. The best way to do integration testing against redis and ioredis is on a real redis-server instance. However, there are cases where mocking the redis-server is a better option.

Cases like:

  • Your workflow already use a local redis-server instance for the dev server.
  • You're on a platform without an official redis release, that's even worse than using an emulator.
  • You're running tests on a CI, setting it up is complicated. If you combine it with CI that also run selenium acceptance testing it's even more complicated, as two redis-server instances on the same CI build is hard.
  • The GitHub repo have bots that run the testing suite and is limited through npm package.json install scripts and can't fire up servers. (Having Greenkeeper notifying you when a new release of ioredis is out and wether your code breaks or not is awesome).

Check the compatibility table for supported redis commands.

Usage (try it in your browser)

var Redis = require('ioredis-mock');
var redis = new Redis({
  // `options.data` does not exist in `ioredis`, only `ioredis-mock`
  data: {
    user_next: '3',
    emails: {
      '[email protected]': '1',
      '[email protected]': '2',
    },
    'user:1': { id: '1', username: 'superman', email: '[email protected]' },
    'user:2': { id: '2', username: 'batman', email: '[email protected]' },
  },
});
// Basically use it just like ioredis

Pub/Sub channels

We also support redis publish/subscribe channels (just like ioredis). Like ioredis, you need two clients:

var Redis = require('ioredis-mock');
var redisPubSub = new Redis();
// create a second Redis Mock (connected to redisPubSub)
var redisSync = redisPubSub.createConnectedClient();
redisPubSub.on('message', (channel, message) => {
  expect(channel).toBe('emails');
  expect(message).toBe('[email protected]');
  done();
});
redisPubSub.subscribe('emails');
redisSync.publish('emails', '[email protected]');

Promises

By default, ioredis-mock uses the native Promise library. If you need (or prefer) bluebird promises, set

Redis.Promise
:
var Promise = require('bluebird');
var Redis = require('ioredis-mock');

Redis.Promise = Promise;

Lua scripting

You can use the

defineCommand
to define custom commands using lua or
eval
to directly execute lua code.

In order to create custom commands, using lua scripting, ioredis exposes the defineCommand method.

You could define a custom command

MULTIPLY
which accepts one key and one argument. A redis key, where you can get the multiplicand, and an argument which will be the multiplicator:
var Redis = require('ioredis-mock');
const redis = new Redis({ data: { 'k1': 5 } });
const commandDefinition: { numberOfKeys: 1, lua: 'return KEYS[1] * ARGV[1]' };
redis.defineCommand('MULTIPLY', commandDefinition) // defineCommand(name, definition)
  // now we can call our brand new multiply command as an ordinary command
  .then(() => redis.multiply('k1', 10));
  .then(result => {
    expect(result).toBe(5 * 10);
  })

You can also achieve the same effect by using the

eval
command:
var Redis = require('ioredis-mock');
const redis = new Redis({ data: { k1: 5 } });
const result = redis.eval(`return redis.call("GET", "k1") * 10`);
expect(result).toBe(5 * 10);

note we are calling the ordinary redis

GET
command by using the global
redis
object's
call
method.

As a difference from ioredis we currently don't support:

  • dynamic key number by passing the number of keys as the first argument of the command.
  • automatic definition of the custom command buffer companion (i.e. for the custom command
    multiply
    the
    multiplyBuffer
    which returns values using
    Buffer.from(...)
    )
  • the
    evalsha
    command
  • the
    script
    command

Roadmap

This project started off as just an utility in another project and got open sourced to benefit the rest of the ioredis community. This means there's work to do before it's feature complete:

  • [x] Setup testing suite for the library itself.
  • [x] Refactor to bluebird promises like ioredis, support node style callback too.
  • [x] Implement remaining basic features that read/write data.
  • [x] Implement ioredis argument and reply transformers.
  • [ ] Connection Events
  • [ ] Offline Queue
  • [x] Pub/Sub
  • [ ] Error Handling
  • [ ] Implement remaining commands

I need a feature not listed here

Just create an issue and tell us all about it or submit a PR with it! 😄

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