Kurasuta

About

Kurasuta is a powerful sharding manager for the discord.js library. It uses Node.js's cluster module to spread shards evenly among all cores.

Installation and Usage

To download Kurasuta, run npm install kurasuta If you use Yarn, run yarn add kurasuta

To use Kurasuta, you can take a look at example

ShardingManager

Important Note Your Sharder file is also executed by each cluster to access the client, client options and ipcsocket properties. You should make sure to wrap all the code what should only run on the Master process in a if statement checking if the current process is the Master process. This does not include ShardingManager#spawn.

Example:

const { isPrimary } = require('cluster');

if (isPrimary) {
	// Code to run on the Master process here
}

Name	Description
path	path to a file that exports a class extending Cluster. The class must contain a method called launch.
options.clientOptions	An object of client options you want to pass to the Discord.js client constructor.
options.clusterCount	The number of how many clusters you want. Defaults to the amount of cores.
options.shardCount	The number of how many shards you want. Defaults to the amount that the gateway recommends, taking options.guildsPerShardinto account.
options.development	Boolean to enable development mode.
options.client	Class extending the Discord.js client you want to use for your clusters (useful for Frameworks like Commando, Klasa, or Akairo). Defaults to Discord.js client.
options.guildsPerShard	Number to calculate how many guilds per shard. Defaults to 1000. Ignored if you set shardCount.
options.respawn	Boolean indicating if exited Clusters should always get restarted. Defaults to true .
options.ipcSocket	Path to Socket or Port that should be used for IPC connections. Defaults to Port 9999.
options.token	Token that should be used to fetch the recommend Shard count if no Shard count was provided.
options.timeout	Time per shard to wait before assuming that a Cluster can't get ready in ms. Defaults to 30000
option.retry	Boolean indicating if Clusters which fail to start but not exit should be restarted. Defaults to true

Events

Name	Argument(s)	Description
debug	message: string	Emitted for debug messages
message	message: unknown	Emitted for custom messages sent from Cluster to Manager
ready	cluster: Cluster	Emitted when a Cluster becomes ready
spawn	cluster: Cluster	Emitted when a Cluster spawns
shardReady	shardID: number	Emitted when a Shard becomes ready
shardReconnect	shardID: number	Emitted when a Shard reconnects
shardResume	replayed: number, shardID: number	Emitted when a Shard resumes
shardDisconnect	closeEvent: CloseEvent, shardID: number	Emitted when a Shard disconnects

Cluster

In every cluster when your code is loaded, you get access to this.client and this.id. this.client is an instance of the Client you provided with nearly no modifications besides the shard property, Discord.js' build-in ShardClientUtil is replaced by Kurasuta's.

ShardClientUtil

Method	Example	Description	Returns
broadcastEval	client.shard.broadcastEval(script);	Evals a script on all clusters in context of the Client.	Promise<unkown[]>
masterEval	client.shard.masterEval(script);	Evals a script on the master process in context of the ShardingManager.	Promise<unkown>
fetchClientValues	client.shard.fetchClientValues(prop);	Fetch a Client value on all clusters.	Promise<unkown[]>
restartAll	client.shard.restartAll();	Sends a message to the master process to kill & restart all clusters.	Promise<void>
restart	client.shard.restart(clusterID);	Restart a specific cluster by id.	Promise<void>
send	client.shard.send(data, options);	send a message to the master process.	Promise<void>

Example

Directory Tree

In this example our setup looks like this:

Project/
├── node-modules/
│   └── kurasuta/
|
└── src/
    ├── main.js
    └── index.js

Example of main.js

const { BaseCluster } = require('kurasuta');

module.exports = class extends BaseCluster {
	launch() {
		this.client.login('YOUR_TOKEN_HERE');
	}
};

Example of index.js

const { ShardingManager } = require('kurasuta');
const { join } = require('path');
const sharder = new ShardingManager(join(__dirname, 'main'), {
	// your options here
});

sharder.spawn();