earthstar-project
willow-rs
Rust

Implementations of the Willow family of specifications in Rust.

Last updated May 10, 2026
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README

Repository moved to https://codeberg.org/worm-blossom/willow_rs

willow-rs

Protocols for synchronisable data stores. The best parts? Fine-grained
permissions, a keen approach to privacy, destructive edits, and a dainty
bandwidth and memory footprint.

Currently, this repo provides Rust implementations of:

  • Everything in the
Willow Data Model (parameters, paths, entries, groupings, encodings, store trait). a capability system adaptable to local needs,
  • SimpleStoreSled, a sled-powered
Willow store implementing the Store trait, enabling persistent storage of Willow data!

Eventually, this repo will also house Rust implementations of:

eventually consistent data delivered by any means possible,
  • and
Willow General Purpose Sync Protocol, private and efficient synchronisation of Willow stores.

We welcome contributions! If you're looking for contribution ideas, please see the repo's issues, milestones, and projects.

See also

implementation of Willow Data Model, Sideloading, and General Purpose Sync protocol. implementation of Meadowcap

Fuzz tests

This repository has many fuzz tests. To use cargo fuzz commands, you must first make fuzz the working directory so that the nightly compiler (on which cargo-fuzz relies) is used for compiling the tests.

cd fuzz
cargo fuzz run <testnamehere>

There is also a command for running all the fuzz tests sequentially:

cd fuzz
./runall.sh -- -maxtotaltime=<numberof_seconds>

This project was funded through the NGI0 Core Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101092990.

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