ScyllaDB Adapter for MoleculerJS

Overview

The ScyllaDB Adapter for MoleculerJS is a powerful and efficient adapter that allows you to seamlessly integrate ScyllaDB with your Moleculer microservices. This adapter provides a simple and intuitive API for performing CRUD operations, making it easy to manage your data in a ScyllaDB database.

This adapter is built using the express-cassandra package, which simplifies interactions with Cassandra and ScyllaDB.

Features

• CRUD Operations: Easily perform Create, Read, Update, and Delete operations on your ScyllaDB collections.
• Connection Management: Automatically handle connections to your ScyllaDB instance.
• Model Support: Define your data models using a schema and interact with them through the adapter.
• Error Handling: Gracefully handle connection and operation errors.
• UUID Support: Convert string IDs to UUIDs and generate new UUIDs for your entities.
• Testing: Comprehensive unit tests to ensure the reliability of the adapter.

Install

$ npm install moleculer-db moleculer-db-adapter-scylla --save

Usage

Create a Moleculer Service: Define a service that uses the ScyllaDB adapter.

const { ServiceBroker } = require("moleculer");
const DbService = require("moleculer-db");
const ScyllaDbAdapter = require("moleculer-db-adapter-scylla");
const users = require('./users.model'); // Import your model

const scyllaOptions = {
   contactPoints: ["127.0.0.1"],
   localDataCenter: "datacenter1",
   keyspace: "test",
   authProvider: { username: "cassandra", password: "cassandra" },
   ormOptions: {
       defaultReplicationStrategy: {
           class: 'SimpleStrategy',
           replication_factor: 1
       },
       migration: 'safe'
   }
};

const adapter = new ScyllaDbAdapter(scyllaOptions);

const broker = new ServiceBroker();

broker.createService({
   name: "users",
   mixins: [DbService],
   adapter: adapter,
   model: users,
   settings: {
       // Define any additional settings here
   },
});

broker.start()
// Create a new user
.then(() => broker.call("users.create", {
   username: "Alice", password: "1234566", age: 21
}))

// Get all users
.then(() => broker.call("users.find", {q: {}}).then(console.log));

Options

Example with scylla options

const scyllaOptions = {
    contactPoints: ["127.0.0.1"],
    localDataCenter: "datacenter1",
    keyspace: "test",
    authProvider: { username: "cassandra", password: "cassandra" },
    ormOptions: {
        defaultReplicationStrategy: {
            class: 'SimpleStrategy',
            replication_factor: 1
        },
        migration: 'safe'
    }
};

const adapter = new ScyllaDbAdapter(scyllaOptions);

Testing

$ npm test 

In development with watching

$ npm run ci

Acknowledgments

• Moleculer - A modern microservices framework for Node.js.
• ScyllaDB - A high-performance NoSQL database compatible with Apache Cassandra.
• express-cassandra - A package that simplifies interactions with Cassandra and ScyllaDB.

License

This project is licensed under the MIT License.

Contact

Copyright (c) 2024 Azita Abdollahi

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