ipfs-log-rs

A Rust implementation of ipfs-log by Haja Networks: an append-only log on IPFS.

ipfs-log-rs is an immutable conflict-free replicated data structure (CRDT) for distributed systems. It is an append-only log that can be used to model a mutable, shared state between peers in peer-to-peer applications.

Every entry in the log is stored in IPFS, and each points to a hash/hashes of the previous entry/entries, forming a graph. Logs can be forked and joined back together.

An example graph from the original implementation readme:

           Log A                Log B
             |                    |
     logA.append("one")   logB.append("hello")
             |                    |
             v                    v
          +-----+             +-------+
          |"one"|             |"hello"|
          +-----+             +-------+
             |                    |
     logA.append("two")   logB.append("world")
             |                    |
             v                    v
       +-----------+       +---------------+
       |"one","two"|       |"hello","world"|
       +-----------+       +---------------+
             |                    |
             |                    |
       logA.join(logB) <----------+
             |
             v
+---------------------------+
|"one","hello","two","world"|
+---------------------------+

Status

Basic functionality implemented (Oct 3, 2019)

• essential log and entry operations
• testing lacking
• documentation lacking to some extent
• stores entries in IPFS only as JSON at the moment, not as CBOR DAGs

Requirements

• Rust 2018 edition

Tests

cargo test

License

MIT © 2016–2018 Protocol Labs Inc.,
2016–2019 Haja Networks Oy,
2019 Equilibrium Labs.