socket-lemur
v1.4.0
Published
The socket-lemur library simplifies WebSocket connections for real-time communication in chat applications and online games. The SocketServer class integrates JWT authentication and API key validation. The SocketClient class facilitates server communicati
Downloads
202
Maintainers
Readme
SocketServer
SocketServer
is a utility class for managing WebSocket channels using Socket.IO, with integrated JWT authentication and API key validation.
Installation
Ensure you have Node.js and npm installed. Then install the required packages:
`npm install socket-lemur`
Usage
Initialize the SocketServer
instance and define custom event handlers for your application.
const { SocketServer } = require("socket-lemur");
// Port Definition
const PORT = process.env.PORT || 4000;
// SocketServer Definition
const server = new SocketServer<{ id: string }>({
apikey: "api-key",
secret: "jwt-secret",
roomsEnabled: true,
});
const data = [
{ id: 1, name: "Pizza" },
{ id: 2, name: "Pasta" },
];
// Actions Definition
async function get() {
return data;
}
async function add(product: { name: string }) {
data.push({ id: data.length + 1, name: product.name });
return data;
}
// Channels Definition
server.channel<any[]>("get/products", async function (_, res) {
const products = await get();
res(products);
});
server.channel<{ name: string }>(
"post/products",
async function (req, res) {
const products = await add(req.body);
res(products);
},
true
);
// Server run on port
server.listen(PORT, function () {
console.log(`Server Run http://localhost:${PORT}`);
});
// On connection
server.connection({
on: function () {
console.log("onConnection");
},
off: function () {
console.log("onDisconnect");
},
});
// More event definitions can be added here
Constructor
new SocketServer<S>(settings?)
Creates a new instance of SocketServer
.
const default: Partial<ServerOptions> = {
cors: {
origin: "*", // Configure CORS as needed
methods: ["GET", "POST"],
credentials: true,
},
allowEIO3: true
};
apikey
(optional): API key for validating requests.secret
(optional): Secret key for JWT token validation.options
(optional): Socket.IO server settingsdefault
.roomsEnabled
(optional): Whether to enable room supportfalse
.
Methods
channel(name, onEvent, tokenRequire, roomSupport)
Establishes channel handling and defines event listeners for Socket.IO.
Parameters:
Initialize handling for a channel with optional room support.
name
: {string} - The name of the channel.onEvent
: {onEvent} - Callback to handle incoming events.tokenRequire
: {boolean} - Whether token authentication is required for events on this channelfalse
.roomSupport
: {boolean} - Whether room support is enabled for this channelthis.roomsEnabled
.
listen:
This method receives the same parameters or configuration from an http server.
port
: {number}.hostname
: {string}.backlog
: {number}.listeningListener
: {function}.
connection:
The server's connection method receives an object with two properties on and off, on detects when a client connects and off when that client disconnects.
on
: {function} connection callback function.off
: {function} disconnection callback function.
SocketClient
SocketClient
class facilitates WebSocket communication with a server using Socket.IO.
Usage
Initialize SocketClient
to connect to a WebSocket server and handle events.
const { SocketClient } = require("socket-lemur");
const PORT = 3030;
const url = `http://localhost:${PORT}`;
// Initialize SocketClient with api_key
const socket = new SocketClient(url, {
apiKey: "api-key",
});
// Initialize SocketClient with api_key and token
const socket = new SocketClient(url, {
apiKey: "api-key",
token: "token",
});
function error(error) {
console.error("Event error:", error);
}
function success(data) {
console.error("Event success:", data);
}
// Connect to a WebSocket channel and define event handlers
const postProduct = socket.channel<any>("post/products", {
onSuccess: success,
onError: error,
room: "post",
});
const geProducts = socket.channel<any[]>("get/products", {
onSuccess: success,
onError: error,
});
geProducts.on(); // Adds the listener function to the end of the listeners array for the event named eventName.
geProducts.off(); // Removes the specified listener from the listener array for the event named eventName.
geProducts.emit();
postProduct.emit(
{
data: { name: "coffe" },
params: { room: "post" },
},
"tokent"
);
Constructor
new SocketClient(serverUrl, apiKey, authToken?)
Creates an instance of SocketClient
to connect to a WebSocket server.
interface Security {
apiKey?: string;
token?: string;
}
serverUrl
: {string} - The URL of the WebSocket server.security
: {Security} - Optional security options{apiKey, token}
.onError
: {OnErrorCallback} - Optional callback to handle errors.
Methods
channel(name, opts: LemurOpts): EmitEvent
Connects to a WebSocket channel and sets up callbacks for error and success events.
declare type LemurOpts<T> = {
onSuccess: OnSuccessCallback<T>;
onError?: OnErrorCallback;
room?: string;
};
name
: {string} - The name of the channel to connect to.opts
: {LemurOpts} - The options for the channel, including success and error callbacks, and an optional room.
The channel method returns an object with multiple actions
emit
: {(data?, token?) => void} - Emits an event to the channel with optional data and token.off
: {() =>void} - Removes the event listeners for the channel.on
: {() =>void} - Event listeners for the channel.
Annotations
To implement SocketClient in vite you must configure this plugin to use Buffer.
npm i -D vite-plugin-node-polyfills
import { defineConfig } from "vite";
import { nodePolyfills } from "vite-plugin-node-polyfills";
export default defineConfig({
plugins: [
// ... other plugin
nodePolyfills(),
],
});