IO Redis Down

This repository is a very simple implementation of abstract-leveldown using ioredis (redis) as the data store.

I couldn't get redis-down to function properly and figured the abstract-leveldown API was simple enough to re-implement.

Usage

  const { IORedisDown } = require('@etomon/ioredisdown');
  const Redis = require('ioredis');
  const levelup = require('levelup');
  
  //  A connection string
  let db = levelup(new IORedisDown('blah'), 'redis://localhost:6379');
  
  // As an object containing settings
  db = levelup(new IORedisDown('blah'), {
    host: '127.0.0.1',
    port: 6379
  });
  
  // Pass your own redis
  const redis = new Redis(6379, '127.0.0.1');
  
  db = levelup(new IORedisDown('blah'), {
    redis: redis
  });

Options

The options (second) parameter in levelup gets passed directly to the constructor of IORedis.

If an array is passed it will spread the array elements across the constructor.

So db = levelup(new IORedisDown('blah'), [ 6379, '127.0.0.1' ])

and

  const redis = new Redis(6379, '127.0.0.1');
  
  db = levelup(new IORedisDown('blah'), {
    redis: redis
  });

Are equivalent

Encoding

I didn't have time to figure out how encoding-down works so encoding/decoding is currently handled by `@etomon/encode-tools.

Crucially, data will be serialized as msgpack by default. Keys will be serialized as JSON, then hashed using xxhash3.

The second argument of the IORedisDown constructor can be used to configure the EncodeTools instance.

At present, the hashing algorithm must be xxhash3.

By default, these are the settings

const DEFAULT_ENCODING_OPTIONS: EncodingOptions = {
  // If Buffers need to be encoded as string they will be encoded as base64
  binaryEncoding: BinaryEncoding.base64,
  // * This is ignored, must be xxhash3 *
  hashAlgorithm: HashAlgorithm.xxhash3,
  // By default will store data as msgpack
  serializationFormat: SerializationFormat.msgpack,
  // Not used
  uniqueIdFormat: IDFormat.uuidv4String
}

Building

@etomon/ioredisdown is written in TypeScript, to build run npm run build.

Documentation

Documentation can be found here.

License

Etomon IORedisDown is licensed under the GNU LGPL-3.0, a copy of which can be found at https://www.gnu.org/licenses/.