Lunar SDK JS

Lunar SDK JS is a lightweight Node.js library that provides an interface for interacting with the Lunar service. It allows you to easily set key-value pairs, optionally with a time-to-live (TTL) value, using a simple API.

Installation

You can install the package via npm:

npm install lunar-js-sdk

Usage

Here is a basic example demonstrating how to use the Lunar SDK JS:

const Lunar = require('lunar-js-sdk');

// Initialize the Lunar SDK
const lunar = new Lunar();

// Optionally set a new connection URL
lunar.connection('http://your-lunar-service-url:8000');

// Set a key-value pair with optional TTL
lunar.set('exampleKey', 'exampleValue', 60); // TTL is in seconds

Methods

new Lunar()

Creates a new instance of the Lunar SDK.

const lunar = new Lunar();

connection(connectionURL)

Sets the base URL for the Lunar service.

• connectionURL (string): The URL of the Lunar service.

lunar.connection('http://your-lunar-service-url:8000');

set(key, value, ttl)

Stores a key-value pair in the Lunar service.

• key (string): The key to be set.
• value (string): The value associated with the key.
• ttl (number, optional): Time-to-live in seconds for the key-value pair. If not provided, the key-value pair will persist indefinitely.

lunar.set('exampleKey', 'exampleValue', 60);

get(key)

Retrieves the value associated with a given key from the Lunar service.

• key (string): The key for which the value needs to be retrieved.

Returns the value associated with the key, or null if the key does not exist or has expired.

lunar.get('exampleKey').then(value => {
  console.log(value); // Outputs the value or null if the key doesn't exist.
});

del(key)

Deletes a key-value pair from the Lunar service.

• key (string): The key to be deleted.

lunar.del('exampleKey').then(response => {
  console.log(response); // Outputs success message or error if the key does not exist.
});

mset(...pairs)

Stores multiple key-value pairs in the Lunar service.

• pairs: A list of keys and values, alternating between them.

lunar.mset('key1', 'value1', 'key2', 'value2').then(response => {
  console.log(response); // Outputs success message.
});

mget(...keys)

Retrieves multiple values associated with the given keys from the Lunar service.

• keys: A list of keys to retrieve.

lunar.mget('key1', 'key2').then(values => {
  console.log(values); // Outputs the values for the keys or null if they do not exist.
});

keys()

Lists all keys stored in the Lunar service.

lunar.keys().then(keys => {
  console.log(keys); // Outputs a list of all keys.
});

clear()

Clears all key-value pairs from the Lunar service.

lunar.clear().then(response => {
  console.log(response); // Outputs success message.
});

size()

Gets the number of key-value pairs stored in the Lunar service.

lunar.size().then(count => {
  console.log(`Number of keys: ${count}`); // Outputs the number of keys.
});

cleanup()

Removes expired entries from the Lunar service.

lunar.cleanup().then(response => {
  console.log(response); // Outputs success message or number of expired entries removed.
});

save(filename)

Saves the current state of the Lunar service to a file.

• filename (string): The name of the file where the state will be saved.

lunar.save('backup.json').then(response => {
  console.log(response); // Outputs success message.
});

load(filename)

Loads the state of the Lunar service from a file.

• filename (string): The name of the file from which the state will be loaded.

lunar.load('backup.json').then(response => {
  console.log(response); // Outputs success message.
});

Error Handling

All methods return a Promise. If an error occurs during the execution of a command, the Promise will be rejected with an error message.

lunar.set('exampleKey', 'exampleValue', 60)
  .then(response => {
    console.log(response);
  })
  .catch(error => {
    console.error('Error:', error);
  });

License

MIT License

Contributing

Contributions are welcome! Please feel free to submit a pull request or open an issue if you find bugs or have suggestions for new features.

Disclaimer

This package assumes that you have the Lunar CLI installed and accessible from your command line. The Lunar CLI is required to execute the commands via the exec function.

Author

Adam Basha