rumour

Project status: experimental.

Implemented:

• Node failure detection
• Peer exchange
• Commandline that prints out node join and failure events

goal

The primary goal is for me to learn a bit of Rust, and familiarize myself with Tokio, futures, and the other important parts of Rust's networking story.

An implementation of the SWIM Protocol in safe, asyncronous rust.

The implementation is based on HashiCorp's Serf.

Constraints:

• should be easily embeddable as a library in C applications
• should not require additional runtime - does not start threads or require a garbage collector
• should use 100% safe Rust code
• events issued through callbacks to application code

Stretch goals:

• custom event propogation beyond cluster membership
• bring-your-own async event loop, so that the library doesn't need to take ownership of a thread
• Serf-style commnandline application to allow users to interact with the cluster without using the library

development instructions

Run

cargo run -- --port 2073 --peeraddress 127.0.0.1:2074 &
cargo run -- --port 2074 --peeraddress 127.0.0.1:2073 &

Runs two instances of the commandline utility that will form a cluster. Each node will print messages when the other node joins or leaves the cluster.

Code structure

• src/node/mod.rs contains code for initializing and running a rumour server It knows about creating a Tokio reactor and wiring together components.
• src/node/mill.rs contains the core logic. Tests in here stub out the Tokio reactor, but should otherwise be a good high-level description of rumour's behaviour.

Tests in other modules are at unit-level, rather than module-level.