Universal Connectivity

Realtime highly decentralised chat app.

Showcasing libp2p's superpowers in establishing ubiquitous peer-to-peer connectivity in modern programming languages (Go, Rust, TypeScript) and runtimes (Web, native binary).

On top of this strong foundation, it layers a GossipSub: A Secure PubSub Protocol for Unstructured Decentralised P2P Overlays. By analogy, an event broker with distributed brokering, or a distributed PubSub protocol.

This is the gossip event protocol that powers Filecoin and Post-Merge Ethereum.

Some of the cool and cutting-edge transport protocols used by this app are:

• WebTransport
• WebRTC
• QUIC
• TCP

Packages

Packge	Description	WebTransport	WebRTC	QUIC	TCP
frontend	Next.js based browser UI of the chat app	✅	✅	❌	❌
go-peer	Chat peer implemented in Go	✅	❌	✅	✅
rust-peer	Chat peer implemented in Rust	❌	✅	✅	❌
node	Chat peer implemented with TypeScript in node.js	❌	❌	❌	✅

✅ - Protocol supported ❌ - Protocol not supported

• Uses the GossipSub PubSub protocol for decentralised messaging

Connecting to a peer

There are two ways to connect to a peer:

• With a PeerID using peer routing (adds a step to resolve the multiaddr for the PeerID), using the IPFS/Libp2p DHT, e.g. 12D3KooWLMySi3eEWscUnKmMCYRSXL3obYJ4KNimpShJK6shUy2M
• With a multiaddr directly (skips the peer routing step), e.g. /ip4/127.0.0.1/udp/64434/webrtc/certhash/uEiA_tkndZQWf7jyFqgCiwH_CqsS7FTWFTb6Px8MPxxT9gQ/p2p/12D3KooWLMySi3eEWscUnKmMCYRSXL3obYJ4KNimpShJK6shUy2M

8-minute project setup & demo video git

Using a multiaddr

Load the UI, and enter the multiaddr into the UI. Ensure that it includes the peerID, e.g./ip4/192.168.178.21/udp/61838/quic-v1/webtransport/certhash/uEiCQCALYac4V3LJ2ourLdauXOswIXpIuJ_JNT-8Wavmxyw/certhash/uEiCdYghq5FlXGkVONQXT07CteA16BDyMPI23-0GjA9Ej_w/p2p/12D3KooWF7ovRNBKPxERf6GtUbFdiqJsQviKUb7Z8a2Uuuo6MrDX

Getting started: frontend

The project uses npm workspaces.

1. Install dependencies

Run npm install from the root of the repo:

npm i

2. Start Next.js dev server

Enter the frontend folder, start the dev server

cd packages/frontend
npm run dev

Getting started: Rust

1. Start peer

cd rust-peer
cargo run

You should see the multiaddr of the peer once its loaded, e.g.

Listen address: "/ip4/127.0.0.1/udp/49350/webrtc/certhash/uEiAs1mQgRDVdSqMsQAuEnpMW0sSj6qc5jNvx2d0r3bQoiA/p2p/12D3KooWMzXTNGDLCKy6i6eAgJPMGCxuu7NJz33T9oC5kjByY27W

Getting started: Go

1. Start peer

cd go-peer
go run .