The Nim implementation of the libp2p Networking Stack.

Table of Contents

• Background
• Install
• Getting Started
  • Go-libp2p-daemon
• Modules
• Users
• Stability
• Development
  • Contribute
  • Contributors
  • Core Maintainers
• License

Background

libp2p is a Peer-to-Peer networking stack, with implementations in multiple languages derived from the same specifications.

Building large scale peer-to-peer systems has been complex and difficult in the last 15 years and libp2p is a way to fix that. It's striving to be a modular stack, with sane and secure defaults, useful protocols, while remain open and extensible. This implementation in native Nim, relying on chronos for async. It's used in production by a few projects

Learn more about libp2p at libp2p.io and follow libp2p's documentation docs.libp2p.io.

Install

Prerequisite

• Nim

  The currently supported Nim version is 1.6.18.

nimble install libp2p

Getting Started

You'll find the nim-libp2p documentation here.

Testing

Remember you'll need to build the go-libp2p-daemon binary to run the nim-libp2p tests. To do so, please follow the installation instructions in daemonapi.md.

Modules

List of packages modules implemented in nim-libp2p:

Users

nim-libp2p is used by:

• Nimbus, an Ethereum client
• nwaku, a decentralized messaging application
• nim-codex, a decentralized storage application
• (open a pull request if you want to be included here)

Stability

nim-libp2p has been used in production for over a year in high-stake scenarios, so its core is considered stable. Some modules are more recent and less stable.

The versioning follows semver, with some additions:

• Some of libp2p procedures are marked as .public., they will remain compatible during each MAJOR version
• The rest of the procedures are considered internal, and can change at any MINOR version (but remain compatible for each new PATCH)

We aim to be compatible at all time with at least 2 Nim MINOR versions, currently 1.6 & 2.0

Development

Clone and Install dependencies:

git clone https://github.com/vacp2p/nim-libp2p
cd nim-libp2p
# to use dependencies computed by nimble
nimble install -dy
# OR to install the dependencies versions used in CI
nimble install_pinned

Run unit tests:

# run all the unit tests
nimble test

This requires the go daemon to be available. To only run native tests, use nimble testnative. Or use nimble tasks to show all available tasks.

Contribute

The libp2p implementation in Nim is a work in progress. We welcome contributors to help out! Specifically, you can:

• Go through the modules and check out existing issues. This would be especially useful for modules in active development. Some knowledge of IPFS/libp2p may be required, as well as the infrastructure behind it.
• Perform code reviews. Feel free to let us know if you found anything that can a) speed up the project development b) ensure better quality and c) reduce possible future bugs.
• Add tests. Help nim-libp2p to be more robust by adding more tests to the tests folder.
• Small PRs. Try to keep PRs atomic and digestible. This makes the review process and pinpointing bugs easier.
• Code format. Please format code using nph v0.5.1. This will ensure a consistent codebase and make PRs easier to review. A CI rule has been added to ensure that future commits are all formatted using the same nph version. The code follows the Status Nim Style Guide.

Contributors

Core Maintainers

Tanguy (Menduist)

Ludovic

Diego

Compile time flags

Enable expensive metrics (ie, metrics with per-peer cardinality):

nim c -d:libp2p_expensive_metrics some_file.nim

Set list of known libp2p agents for metrics:

nim c -d:libp2p_agents_metrics -d:KnownLibP2PAgents=nimbus,lighthouse,lodestar,prysm,teku some_file.nim

Specify gossipsub specific topics to measure in the metrics:

nim c -d:KnownLibP2PTopics=topic1,topic2,topic3 some_file.nim

License

Licensed and distributed under either of

• MIT license: LICENSE-MIT or http://opensource.org/licenses/MIT

or

• Apache License, Version 2.0, (LICENSE-APACHEv2 or http://www.apache.org/licenses/LICENSE-2.0)

at your option. These files may not be copied, modified, or distributed except according to those terms.