Momento Node.js IORedis compatibility client

What and why?

This project provides a Momento-backed implementation of ioredis The goal is to provide a drop-in replacement for ioredis so that you can use the same code with either a Redis server or with the Momento Cache service!

Installation

The Momento Node.js IORedis compatibility client is available on npm.js. You can install it via:

npm install @gomomento-poc/node-ioredis-client

Usage

To switch your existing ioredis application to use Momento Cache, you only need to change the code where you construct your client object. Here is an example of constructing a Momento ioredis client:

// Import the Momento redis compatibility client.
import {MomentoRedisAdapter, CacheClient, CredentialProvider} from '@gomomento-poc/node-ioredis-client';

// Instantiate Momento Adapter
const redis = new MomentoRedisAdapter(
  new CacheClient({
    credentialProvider: CredentialProvider.fromEnvironmentVariable('MOMENTO_API_KEY'),
    defaultTtlSeconds: 3600,
  }),
  'cache'
);

// make redis calls!
await redis.set('my-key', 'my-value');
const value = await redis.get('my-key');
console.log(`redis.get('my-key') returned: ${value}`);

Alternately, if you'd like to be able to easily switch back and forth between Momento and Redis using environment variables, you can use the NewIORedisWrapper and NewIORedisClusterWrapper wrapper functions:

import {NewIORedisWrapper} from '@gomomento-poc/node-ioredis-client';

// set env vars to configure Momento; For more info, see Momento wrapper function configuration section.
process.env['MOMENTO_ENABLED'] = 'true';
process.env['MOMENTO_DEFAULT_TTL_SECONDS'] = '3600';
process.env['MOMENTO_CACHE_NAME'] = 'cache';

const redis = NewIORedisWrapper();

// Or initialize Momento as you would an ioredis cluster client
// const redis = NewIORedisClusterWrapper([], {});

// make redis calls!
await redis.set('my-key', 'my-value');
const value = await redis.get('my-key');
console.log(`redis.get('my-key') returned: ${value}`);

NOTE: The Momento ioredis implementation currently supports simple key/value pairs (GET, SET, DELETE) as well as hash values (HGET/HSET). We will continue to add support for additional Redis APIs in the future; for more information see the current Redis API support section later in this doc.

Compression

The Momento ioredis client provides built-in support for compression. If your data contains relatively large text-based data structures (e.g. large JSON objects), compression can significantly speed up your application and potentially reduce network costs. To enable compression, all you need to do is set the compression option to true when constructing your client:

// Import the Momento redis compatibility client.
import {MomentoRedisAdapter, CacheClient, CredentialProvider} from '@gomomento-poc/node-ioredis-client';

// Instantiate Momento Adapter
const redis = new MomentoRedisAdapter(
  new CacheClient({
    credentialProvider: CredentialProvider.fromEnvironmentVariable('MOMENTO_API_KEY'),
    defaultTtlSeconds: 3600,
  }),
  'cache',
  {
    useCompression: true,
  }
);

// make redis calls!
await redis.set('my-key', 'my-value');
const value = await redis.get('my-key');
console.log(`redis.get('my-key') returned: ${value}`);

After making this change to the configuration, all of your data will be compressed before storing it in the Momento cache, and will be automatically decompressed when retrieved.

Momento wrapper function configuration

In this package we provide wrapper functions that help you configure whether or not to use Momento and how client settings should look based off environment variables. This is to try and make for a simpler drop in experience where you might be running Momento or Redis based off the environment or Region. This applies for NewIORedisWrapper and NewIORedisClusterWrapper wrapper functions.

EnvVar Name	Description	Default
MOMENTO_ENABLED	Will allow you to toggle between using Momento and IORedis	false
MOMENTO_API_KEY	The Momento Auth token you would like to use	""
MOMENTO_CACHE_NAME	The name of the Momento Cache to use if Momento is enabled	""
MOMENTO_DEFAULT_TTL_SECONDS	The number of seconds to cache items for by default	86400

Current Redis API support

This library supports the most popular Redis APIs, but does not yet support all Redis APIs. We currently support the most common APIs related to string values (GET, SET, DELETE), as well as hash values (HGET/HSET). We will be adding support for additional APIs in the future. If there is a particular API that you need support for, please drop by our Discord or e-mail us at support@momentohq.com and let us know!

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For more info, visit our website at https://gomomento.com!