gRPC over HTTP/2 implementation with protobuf-based codegen, high-performance async IO, bi-directional streaming, TLS support, load balancing, health checking and reflection utilities.
This is a Kotlin Multiplatform line-by-line transliteration port of hyperium/tonic.
Original Project: This port is based on hyperium/tonic. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.
This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.
hyperium/tonicThe text below is reproduced and lightly edited from
https://github.com/hyperium/tonic. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.
A rust implementation of gRPC, a high performance, open source, general RPC framework that puts mobile and HTTP/2 first.
Note: tonic's master branch is currently preparing breaking changes. For the most recently released code, look to the 0.14.x branch.
tonic is a gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility. This library was created to have first class support of async/await and to act as a core building block for production systems written in Rust.
Examples | Website | Docs | Chat
tonic is composed of three main components: the generic gRPC implementation, the high performance HTTP/2
implementation and the codegen powered by prost. The generic implementation can support any HTTP/2
implementation and any encoding via a set of generic traits. The HTTP/2 implementation is based on ,
a fast HTTP/1.1 and HTTP/2 client and server built on top of the robust stack. The codegen
contains the tools to build clients and servers from definitions.
rustlshelloworld tutorial provides a basic example of using tonic, perfect for first time users!routeguide tutorial provides a complete example of using tonic and all its features.Examples can be found in examples and for more complex scenarios interop
may be a good resource as it shows examples of many of the gRPC features.
tonic's MSRV is 1.88.
tonic-build uses protoc Protocol Buffers compiler in some APIs which compile Protocol Buffers resource files such as tonic_build::compile_protos().
First, see if the answer to your question can be found in the API documentation. If the answer is not there, there is an active community in the Tonic Discord channel. We would be happy to try to answer your question. If that doesn't work, try opening an issue with the question.
:balloon: Thanks for your help improving the project! We are so happy to have you! We have a contributing guide to help you get involved in the Tonic project.
This project is licensed under the MIT license.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tonic by you, shall be licensed as MIT, without any additional terms or conditions.
dependencies {
implementation("io.github.kotlinmania:tonic-prost-build-kotlin:0.1.0")
}
./gradlew build
./gradlew test
See AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.
This Kotlin port is distributed under the same MIT license as the upstream hyperium/tonic. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.
Original work copyrighted by the tonic authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.
Thanks to the hyperium/tonic maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.
hypertonic: Generic gRPC and HTTP/2 client/server implementation.tonic-build: prost based service codegen.tonic-types: prost based grpc utility types including support for gRPC Well Known Types.tonic-health: Implementation of the standard gRPC health checking service.
Also serves as an example of both unary and response streaming.tonic-reflection: A tonic based gRPC reflection implementation.examples: Example gRPC implementations showing off tls, load balancing and bi-directional streaming.interop: Interop tests implementation.Surfaced from shared tags and platforms — no rankings paid for.