Package - redis

:warning: Version 4 is still under development and isn't ready for production use. Use at your own risk.

Node Redis

A high performance Node.js Redis client.

Installation

npm install redis@next

Usage

Basic Example

import { createClient } from 'redis';

(async () => {
    const client = createClient();

    client.on('error', (err) => console.log('Redis Client Error', err));
    
    await client.connect();

    await client.set('key', 'value');
    const value = await client.get('key');
})();

The new interface is clean and cool, but if you have an existing code base, you might want to enable legacy mode.

Redis Commands

There is built-in support for all of the out-of-the-box Redis commands. They are exposed using the raw Redis command names (HGET, HSET, etc.) and a friendlier camel-cased version (hGet, hSet, etc.).

// raw Redis commands
await client.SET('key', 'value');
await client.GET('key');

// friendly JavaScript commands
await client.hSet('key', 'field', 'value');
await client.hGetAll('key');

Modifiers to commands are specified using a JavaScript object:

await client.set('key', 'value', {
    EX: 10,
    NX: true
});

Replies will be transformed to useful data structures:

await client.hGetAll('key'); // { key1: 'value1', key2: 'value2' }
await client.hKeys('key'); // ['key1', 'key2']

Unsupported Redis Commands

If you want to run commands and arguments that Node Redis doesn't know about (yet!) you can use .sendCommand:

await client.sendCommand(['SET', 'key', 'value', 'NX']); // 'OK'

await client.sendCommand(['HGETALL', 'key']); // ['key1', 'field1', 'key2', 'field2']

Blocking Commands

Any command can be run on a new connection by specifying the duplicateConnection option. The newly created connection is closed when the command's Promise is fulfilled.

This pattern works especially well for blocking commands—such as BLPOP and BRPOPLPUSH:

const blPopPromise = client.blPop(
    client.commandOptions({ duplicateConnection: true }),
    'key'
);

await client.lPush('key', ['1', '2']);

await blPopPromise; // '2'

Pub/Sub

Subscribing to a channel requires a dedicated Redis connection and is easily handled using events.

await subscriber.subscribe('channel', message => {
    console.log(message); // 'message'
});

await subscriber.pSubscribe('channe*', (message, channel) => {
    console.log(message, channel); // 'message', 'channel'
});

await publisher.publish('channel', 'message');

Lua Scripts

You can define Lua scripts to create efficient custom commands:

import { createClient } from 'redis';
import { defineScript } from 'redis/dist/lib/lua-script';

(async () => {
    const client = createClient({
        scripts: {
            add: defineScript({
                NUMBER_OF_KEYS: 1,
                SCRIPT:
                    'local val = redis.pcall("GET", KEYS[1]);' +
                    'return val + ARGV[1];',
                transformArguments(key: string, toAdd: number): Array<string> {
                    return [key, number.toString()];
                },
                transformReply(reply: number): number {
                    return reply;
                }
            })
        }
    });

    await client.connect();

    await client.set('key', '1');
    await client.add('key', 2); // 3
})();

Legacy Mode

Need to use the new client in an existing codebase? You can use legacy mode to preserve backwards compatibility while still getting access to the updated experience:

const client = createClient({
    legacyMode: true
});

// legacy mode
client.set('key', 'value', 'NX', (err, reply) => {
    // ...
});

// version 4 interface is still accessible
await client.v4.set('key', 'value', {
    NX: true
});

Cluster

Connecting to a cluster is a bit different. Create the client by specifying the root nodes in your cluster and then use it like a non-clustered client.

import { createCluster } from 'redis';

(async () => {
    const cluster = createCluster({
        rootNodes: [{
            host: '192.168.1.1',
            port: 30001
        }, {
            host: '192.168.1.2',
            port: 30002
        }]
    });

    cluster.on('error', (err) => console.log('Redis Cluster Error', err));
    
    await cluster.connect();

    await cluster.set('key', 'value');
    const value = await cluster.get('key');
})();

Contributing

If you'd like to contribute, check out the contributing guide.

License

This repository is licensed under the "MIT" license. See LICENSE.

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