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moleculer-db-adapter-scylla

v1.2.2

Published

ScyllaDB adapter for Moleculer DB service.

Downloads

14

Readme

moleculer

npm version NPM Downloads NPM Unpacked Size

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