Intro

This library allows you to establish p2p connections between polkadot accounts and instantly exchange data in both directions.

Usage:

You can create a DOTRTC instance with the necessary settings and specify event handlers (connection request, successful connection, disconnection):

const p2p = new DOTRTC({
    iceServer:      string,                 //Stun or turn server (https://datatracker.ietf.org/doc/html/rfc8445), example: `stun:stun.services.mozilla.com`
    endpoint:       string                  //Endpoint of parachain node, for example `wss://diffy.bsn.si`
    phrase:         string,                 //Secret phrase
    onConnectionRequest: function() {...}   //Handler that will be called when someone tries to connect to you
    onConnect: function() {...}             //Handler that will be called when a connection is successfully established with someone
    onDisconnect: function() {...}          //Handler will be called when the connection is broken (the remote user forcibly disconnected, or may be caused by problems with the Internet connection)
});

When creating a DOTRTC instance, you must specify a successful connection handler:

onConnect: function(channel) {
    console.log('connection established with:', channel.remoteAddress);
}

You can assign a nickname to your wallet. Other users will connect to you using this username:

p2p.register('<USERNAME>');

Create a p2p connection to the account by his DOT address:

p2p.connect({
    to: '<USERNAME>'
});

After that, the onConnectionRequest event will fire for the user they are trying to connect to, in which a connection request will come. The user will have to accept it or ignore it.

onConnectionRequest: function(connection) {
    console.log(connection.remoteAddress);      //`connection.remoteAddress` contains the address of the user who is trying to connect to us
    connection.accept();                        //allow this user to connect to us
}

Upon successful connection, the onConnect handler will be called, in which the channel object of the connection will come in the arguments, through which messages can be sended The channel object has the following methods:

channel.sendMessage(payload);                   //send message to remote address. Payload must be type Uint8Array
channel.onMessage(payload => {                  //payload is Uint8Array
    console.log(data);
});

Demo

The repository contains a demo page (in the /demo directory) that demonstrates the operation of the DotRTC library

This demo page uses a substrate deployed at wss://diffy.bsn.si. Test users alice (private key //Alice) and bob (private key //Bob) are already registered in this parachain. If you want to launch a page with your own parachain, then when initializing DotRTC (https://github.com/Belsoft-rs/diffychat-dotrtc/blob/main/demo/index.js#L28) you need to add the endpoint parameter with the address parachain nodes, for example:

endpoint: 'wss://diffy.bsn.si/'

Demo build

To install dependencies use

npm i

Rollup is used to build the test page (конфиг: https://github.com/Belsoft-rs/diffychat-dotrtc/blob/main/demo/rollup.config.js)

rollup -c ./rollup.config.js

Compiled js for test page including all dependencies will be in /demo/build directory.

To run use html file (https://github.com/Belsoft-rs/diffychat-dotrtc/blob/main/demo/index.html)

For ease of viewing and testing, this page has already been deployed on github pages and is available at:

https://belsoft-rs.github.io/diffychat/

Unit test

To run unit tests, use command

npm test

Demo video