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coordinator/tributary was tributary-chain. This crate has been renamed tributary-sdk and moved to coordinator/tributary-sdk. coordinator/src/tributary was our instantion of a Tributary, the Transaction type and scan task. This has been moved to coordinator/tributary. The main reason for this was due to coordinator/main.rs becoming untidy. There is now a collection of clean, independent APIs present in the codebase. coordinator/main.rs is to compose them. Sometimes, these compositions are a bit silly (reading from a channel just to forward the message to a distinct channel). That's more than fine as the code is still readable and the value from the cleanliness of the APIs composed far exceeds the nits from having these odd compositions. This breaks down a bit as we now define a global database, and have some APIs interact with multiple other APIs. coordinator/src/tributary was a self-contained, clean API. The recently added task present in coordinator/tributary/mod.rs, which bound it to the rest of the Coordinator, wasn't. Now, coordinator/src is solely the API compositions, and all self-contained APIs are their own crates.
Serai Coordinator libp2p P2P
A libp2p-backed P2P instantiation for Serai's coordinator.
The libp2p swarm is limited to validators from the Serai network. The swarm does not maintain any of its own peer finding/routing infrastructure, instead relying on the Serai network's connection information to dial peers. This does limit the listening peers to only the peers immediately reachable via the same IP address (despite the two distinct services), not hidden behind a NAT, yet is also quite simple and gives full control of who to connect to to us.
Peers are decided via the internal DialTask which aims to maintain a target
amount of peers for each external network. This ensures cosigns are able to
propagate across the external networks which sign them.