Introduction to alt:V RPC in JavaScript

alt:V is a multiplayer modification for Grand Theft Auto V that allows developers to create their own custom multiplayer game modes. One of the key features of alt:V is the ability to use Remote Procedure Calls (RPCs) to communicate between clients and servers.

In this guide, we will explore how to use alt:V RPC in JavaScript.

Setting up your project

Before you can use alt:V RPC, you need to set up your project. First, you will need to install the alt:V client and server packages. You can do this by running the following command in your project directory:

npm install altv-client altv-server

Next, you will need to create a main server script that initializes the alt:V server and sets up your game mode. Here is an example of what this might look like:

const alt = require('alt-server');

alt.on('playerConnect', (player) => {
    player.spawn(-200, -100, 30);
});

alt.on('playerDisconnect', (player) => {
    console.log(`${player.name} has disconnected`);
});

alt.on('playerDeath', (player, killer, weapon) => {
    player.spawn(-200, -100, 30);
});

alt.on('ready', () => {
    console.log('Server started!');
});

Creating an RPC

Once you have set up your project and initialized the alt:V server, you can create an RPC. An RPC is a function that can be called by a client and executed on the server. To create an RPC, you need to define a function and decorate it with the @rpc decorator. Here is an example:

const alt = require('alt-server');

class MyRpc {
    // This function can be called by a client
    @alt.rpc
    static myRpcFunction(player, arg1, arg2) {
        console.log(`Received RPC from ${player.name}: ${arg1}, ${arg2}`);
        player.send('MyEvent', 'Hello client!');
    }
}

alt.on('playerConnect', (player) => {
    // Call the RPC when the player connects
    MyRpc.myRpcFunction(player, 'arg1', 'arg2');
});

In this example, we have defined a static function called myRpcFunction that is decorated with the @alt.rpc decorator. This function takes three arguments: the player who called the RPC, and two additional arguments.

When the playerConnect event is triggered, we call the myRpcFunction function with the player object and two additional arguments. This will execute the function on the server, and send a message back to the client with the player.send method.

Calling an RPC

To call an RPC from the client, you need to use the alt.emitServer method. Here is an example:

alt.onServer('MyEvent', (message) => {
    console.log(`Received message from server: ${message}`);
});

alt.emitServer('myRpcFunction', 'arg1', 'arg2');

In this example, we have defined a callback function for the MyEvent event, which is called when the client receives a message from the server. We then call the alt.emitServer method with the name of the RPC function, and any additional arguments.

When the server receives the RPC call, it executes the function and sends a message back to the client with the player.send method. This will trigger the MyEvent event on the client, and print the message to the console.

Conclusion

alt:V RPC is a powerful tool that allows you to communicate between clients and servers in custom multiplayer game modes. By following the steps outlined in this guide, you can create your own custom RPCs and build complex multiplayer experiences in JavaScript.