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https://github.com/madawei2699/free4chat

free4.chat is a real-time audio chat service. It is designed by the local first and privacy first principle, and is very easy to use.
https://github.com/madawei2699/free4chat

distributed-systems elixir erlang-otp games nextjs p2p phoenix react real-time-collaboration real-time-communication real-time-web realtime-web realtime-web-application robot rxjs sfu tailwindcss voice-chat webrtc websocket

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free4.chat is a real-time audio chat service. It is designed by the local first and privacy first principle, and is very easy to use.

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# free4chat



[free4.chat](https://free4.chat/) is a __real-time__ audio chat service. It is designed by the [local first](https://www.inkandswitch.com/local-first/) and `privacy first` principle, and is very easy to use.

 

> :warning: **This project is just using for technical test purpose, use at all your risk!**

>

> :warning: **There is freedom of speech, but I cannot guarantee freedom after speech.** (- Idi Amin)



## Features



- **Real-time Communicating**

  - [x] Voice chat in room

  - [x] Text chat in room, can sent text or emoji

    - [ ] Persist text messages to browser localStorage

  - [ ] Can send arbitrary data by WebRTC datachannel 🚩

  - [ ] Room permission setting, like public/private type setting

    - private room can't been seen on room discovery, and it needs password to enter. The password is [End-to-End Encryption](https://blog.excalidraw.com/end-to-end-encryption/), server only need check the answer which given by the client like the `PoW` in blockchain.

    - [ ] Public rooms discovery, like hot room list or filter rooms by type/tag

- **Real-time Collaborating**  

  - [ ] User real-time collaboration, like whiteboard, you draw I guess, etc.

    - [ ] Use [CRDT](https://crdt.tech/) to impelement real-time collaboration

      - https://github.com/derekkraan/delta_crdt_ex

      - https://github.com/electric-sql/vaxine

      - https://github.com/liveblocks/liveblocks

      - https://github.com/yjs/yjs

    - [ ] Whiteboard

      - https://github.com/tldraw/tldraw

- **Real-time Contesting**

  - [ ] AI Robot user, like game robot who can play or facilitate game

    - robot use [Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API) to play with user in room

      - Azure [Text to speech](https://azure.microsoft.com/en-us/products/cognitive-services/text-to-speech/#overview) service.

    - robot can play some voice games like language learning, technical interview, etc.

      - [Gartic Phone - The Telephone Game](https://garticphone.com/lobby)

      - [ESL Game - Not only practicing English speaking](https://esl.bmpi.dev/)

      - [Gartic.io - Draw, Guess, WIN](https://gartic.io/)

      - [Get to know someone in 17 seconds](https://github.com/caydennn/seventeen-web-app)

    - AI + Voice

      - Deep learning models are changing the world

        - [@midjourney](https://twitter.com/midjourney) can generate fatastic image from text

        - [@GitHubCopilot](https://twitter.com/GitHubCopilot) can generate context-awared code from short code segment

        - [@OpenAI](https://twitter.com/OpenAI) GPT-3 model can generate text paragraph from short sentence segment

      - Voice conversation from text?



## Architecture



- **Common**

  - [x] Use [WebSocket](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket) to replace http protocol of JSON-RPC

  - Compatibility

    - [ ] Make Safari(WebKit) compatibility better



- **Tech Stack**

  - [x] Use Elixir/Phoenix to rewrite the backend code

  - [x] Use Recat/Next.js to rewrite the frontend code



- **Infra**

  - [x] ~~Use docker to deploy to PaaS platform like [Railway](https://railway.app/) or [Fly](https://fly.io/)~~ 

  - [x] Use GitHub Actions + AWS Lightsail to deploy backend server

  - [x] Backend service cluster, auto scaling, load balancing, etc.

    - Backend service use Elixir libcluster to build cluster

    - Frontend app use the client load balance strategy

    - [x] [TURN cluster scale](https://github.com/membraneframework/membrane_ice_plugin/issues/20)

      - Fix by start turn before the libcluster, still wait the upstream library to fix it normally

    - [ ] Room process rebalance, that means if the node where room in is offline, then the room process can rebalance to another node, the rebalance can use [Consistent hashing](https://en.wikipedia.org/wiki/Consistent_hashing) to implement

      - For now, we just ignore this issue, because it can be resolved by reconnect another node and create the room again

      - Some Elixir simple approaches

        - [Swarm](https://github.com/bitwalker/swarm)

        - [Horde](https://github.com/derekkraan/horde)

      - A complex approach is use [Riak Core](https://github.com/basho/riak_core) which implement the `Consistent hashing` and can rebalance the process by [VNode](https://www.erlang-factory.com/upload/presentations/294/MasterlessDistributedComputingwithRiakCore-RKlophaus.pdf)

        - [NkDIST](https://github.com/NetComposer/nkdist), a Erlang distributed registration and load balancing lib which is base on `Riak Core`

      - [Tinode chat](https://github.com/tinode/chat) solve this issue by implementing the [Raft Consensus Algorithm](https://raft.github.io/)

        

        More



          - https://github.com/tinode/chat/issues/28

          - https://github.com/tinode/chat/issues/279

          - https://github.com/tinode/chat/blob/master/server/topic_proxy.go

          - https://github.com/tinode/chat/blob/master/server/cluster.go

          - https://github.com/tinode/chat/blob/master/server/cluster_leader.go

          - https://github.com/tinode/chat/blob/master/server/ringhash/ringhash.go

        

  - [ ] Security enhancement, like coturn TLS setup, end-to-end encryption, etc.

    - [ ] TURN enable TLS

  - [ ] Privacy enhancement.

  - [ ] IPV6 support.

  

## Documentation



https://dev-notes.free4.chat/



## Contribution



If you are interested in `webRTC`, `peer-to-peer(P2P)`, `real-time collaboration(CRDT)`, `distributed system` or `robot design`, you can join this project and contact with me by [twitter](https://twitter.com/madawei2699).



## Thanks



- free4.chat Elixir version is build on the top of [Membrane Framework](https://github.com/membraneframework), thanks for their heart of open source.

- [free4.chat Golang version](https://github.com/madawei2699/free4chat/tree/golang) is build on the top of [Kraken](https://github.com/bmpi-dev/kraken), [Mornin](https://github.com/lyricat/mornin.fm), [coturn](https://github.com/coturn/coturn) and [Pion](https://github.com/pion), thanks for their heart of open source.

- These websites also inspired me:

  - [Random voice and text chat rooms that you’ll love. | Speakrandom](https://www.speakrandom.com/)

  - [Practice Speaking English Online Free - Language Practice Community](https://www.free4talk.com/)

  - [Agora Real-Time Voice and Video Engagement](https://www.agora.io/en/)

  - [An open network for secure, decentralized communication - Matrix](https://matrix.org/)

  - [Introduction to Realtime Web Applications](https://realtime-apps-iap.github.io/)

  - [Gather | Building better teams, bit by bit](https://www.gather.town/)