Rust implementation of an Inter-Blockchain Communication (IBC) relayer.

This project comprises primarily of 6 crates:

• ibc-relayer provides an implementation of an IBC relayer, as a library.
• ibc-relayer-cli is a CLI (a wrapper over the ibc-relayer library), comprising the hermes binary.
• ibc-chain-registry provides functions to fetch data from the chain registry and automatically generate chain configuration for Hermes.
• ibc-telemetry is a library for use in the Hermes CLI, for gathering telemetry data and exposing that in a Prometheus endpoint.
• ibc-relayer-rest is a library for use in the Hermes CLI, for exposing a REST API to inspect the state of the relayer.
• ibc-test-framework provides the infrastructure and framework for writing end-to-end (E2E) tests that include the spawning of the relayer together with Cosmos full nodes.

See the table below for more details.

⚠️ The ibc and ibc-proto crates have been moved to their own repositories.

The repository also includes TLA+ specifications.

Crate name	Type	Version	Docs
ibc-relayer-cli	bin: hermes
ibc-relayer	lib
ibc-chain-registry	lib
ibc-relayer-rest	lib
ibc-telemetry	lib
ibc-test-framework	lib

The crates in this project require Rust 1.71.1.

We have a comprehensive guide at hermes.informal.systems.

IBC is specified in English in the cosmos/ibc repo. Any protocol changes or clarifications should be contributed there.

This repo contains the TLA+ specification and Rust implementation for the IBC modules and relayer. If you're interested in contributing, please comment on an issue or open a new one!

See also CONTRIBUTING.md.

We follow Semantic Versioning, though APIs are still under active development.

• IBC Website
• IBC Specification
• IBC Modules in Go
• IBC Relayer in Typescript
• IBC Relayer in Go

Copyright © 2023 Informal Systems Inc. and Hermes authors.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use the files in this repository except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.