3 releases

0.1.2 Apr 7, 2021
0.1.1 Feb 15, 2021
0.1.0 Jan 13, 2021

#224 in Procedural macros

34 downloads per month
Used in harmony_rust_sdk

MIT license

186 lines

GitHub Workflow Status crates.io docs.rs docs.rs MSRV

Rust implementation of the Harmony chat protocol. Currently implements a lightweight client and a client API (powered by tonic), along with auto generated API via tonic-build.


  • Latest stable Rust and Cargo.
  • If you are using Nix, nix-shell (or nix develop if you use flakes) should get you covered.
  • Otherwise, you'll need to get protobuf and make sure protoc is in your PATH env variable.
    • If for some reason build.rs fails, make sure to set:
      • PROTOC env variable to your protoc executable
      • and PROTOC_INCLUDE env variable to wherever protobuf include files are located, most likely in /usr/share/include.


  • echo_bot: Showcases a simple message echo bot that operates in a guild. It will repost messages whenever someone else posts a message.

  • message_log: Showcases a simple message log bot that operates in a guild. It will log messages to the console whenever someone posts a message.

  • Bot run instructions:

    • Run bots with GUILD_INVITE=invite cargo run --example example_name.
    • Make sure the bot has necessary permissions to view channels / send messages etc.

Crate features

  • By default, only a bare-bones common API of all services is generated. You can customize the crate to your needs by enabling feature(s) listed below:
    • Enable the parking_lot feature if you want to use parking_lot sync types instead of std::sync.
    • Enable the client feature for a lightweight client implementation and the client API.
      • Enable the request_method feature to enable a request method in Client which allows you to make requests using Client::request().
    • Enable the gen_client feature to generate client service code.
    • Enable the gen_server feature to generate server service code.
    • (Default) Enable the gen_chat feature to generate chat service code.
    • (Default) Enable the gen_auth feature to generate auth service code.
    • (Default) Enable the gen_voice feature to generate voice service code.
    • (Default) Enable the gen_mediaproxy feature to generate media proxy service code.
    • (Default) Enable the gen_harmonytypes feature to generate common Harmony types.


Minimum Supported Rust Version: previous stable.

Changing MSRV is not considered a semver-breaking change.


~19K SLoC