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cpp-libp2p/example/02-kademlia
Ruslan Tushov d85fdc6a51
kad put (#274) 		4 weeks ago
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CMakeLists.txt Refactor: format, include-guards, copyrights, git-hooks (#222) 1 year ago
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rendezvous_chat.cpp kad put (#274) 4 weeks ago

README.md

Example using Kademlia for peer discovery

General description

  • rendezvous_chat.cpp is a simple chat-client with peer discovery in DHT

Launching

rendezvous_chat

./rendezvous_chat [LISTEN_ADDR]

where LISTEN_ADDR is libp2p address for incoming connection

Explanation by example: ./rendezvous_chat /ip4/127.0.0.1/tcp/3333 means that local node will listen port 3333 on IP 127.0.0.1

What is happening after launching

  1. App connects to bootstrap nodes and starts random-walk to collect peer infos
  2. The network (known peers) is notified about owns providing of chat features
  3. The app starts searching for other providers with the same chat protocol
  4. The app connects to the found peers and accepts incoming connections

Normal work

First message in terminal contains own peer_id:

12D3KooWKpQQojSESeYK5wgxhiHFfWGt1DT37WMks4e2wXjjTrZj * started

Incoming and outgoing connections look like:

12D3KooWNrhWQqbFkwg3Viz3HL2jCdvK9Q3Nieu9QXX37c17Aw2Y + outgoing stream to /ip4/127.0.0.1/tcp/3333
12D3KooWN4U92XG49kSjJ6p5TUEWxj76V432HfbmQAXwryLApkue + incoming stream from /ip4/127.0.0.1/tcp/58442

After connection was established you can start chatting by typing a message in terminal:

Hello! Where are you from?
12D3KooWN4U92XG49kSjJ6p5TUEWxj76V432HfbmQAXwryLApkue < Hello! Where are you from?
12D3KooWN4U92XG49kSjJ6p5TUEWxj76V432HfbmQAXwryLApkue > Hi! I'm from Mars.

Note

Finding partner can take some time. You can start two clients on the different ports (or IPs), but it is important that clients can connect to each other.