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Node.js socket.dropMembership() Method

  • Last Updated : 20 Jul, 2021

The socket.dropMembership() method is an inbuilt application programming interface of class Socket within dgram module which is used to make kernel leave a multicast group at the particular multicast address.

Syntax:

const socket.dropMembership(multicastAddress[, multicastInterface])

Parameters: This method takes the string representing of the multicast address and multicast interface as the parameter.

Return Value: This method does not return any value.

Example 1: Filename: index.js



Javascript




// Node.js program to demonstrate the
// socket.dropMembership() method
 
// Importing dgram module
var dgram = require('dgram');
 
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
 
// Catching the message event
server.on("message", function (msg) {
 
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
 
    // Exiting process
    process.exit();
})
.bind(1234, () => {
 
    // Joining a multicast group at
    // multicast address
    server.addMembership('224.0.0.114');
 
    // leaving a multicast group at
    // multicast address
    server.dropMembership('224.0.0.114');
});
 
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

Output: 
 

UDP String: Hello

 Example 2: Filename: index.js 

Javascript




// Node.js program to demonstrate the
// socket.dropMembership() method
 
// Importing dgram module
var dgram = require('dgram');
 
// Creating and initializing client
// and server socket
var client = dgram.createSocket("udp4");
var server = dgram.createSocket("udp4");
 
// Catching the message event
server.on("message", function (msg) {
 
    // Displaying the client message
    process.stdout.write("UDP String: " + msg + "\n");
 
    // Exiting process
    process.exit();
});
 
// Catching the listening event
server.on('listening', () => {
    const address = server.address();
    console.log(`server listening
        ${address.address}:${address.port}`);
});
 
// Binding server with port address
server.bind(1234, () => {
 
    // Adding a multicast address for
    // others to join
    server.addMembership('224.0.0.114');
 
    // leaving a multicast group at multicast
    // address by using dropMembership() method
    server.dropMembership('224.0.0.114');
});
 
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");

Output: 
 

server listening 0.0.0.0:1234
UDP String: Hello

 Run the index.js file using the following command: 

node index.js

 Reference: https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_dropmembership_multicastaddress_multicastinterface

 




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