weir-core

Shared types, wire protocol, and error types for weir — a durable write-ahead-buffer daemon.

Cross-platform. Contains the wire types — Envelope, Header, MessageType, Durability, NackReason, Payload, RecordCoordinate — the batch module's PushBatch/AckBatch codec, and MAX_PAYLOAD_HARD_CAP.

Two version numbers, and only one of them is frozen. WIRE_VERSION is still 1 and the v1 wire format is frozen: it has a language-neutral conformance suite, and growth within v1 is additive (PushTracked/AckTracked, PushBatch/ AckBatch), so an older decoder is correct to reject an addition it does not implement. The crate's SemVer is not frozen and is well past 1.0 — this crate's public Rust API is what has forced every major bump so far (2.0 collapsed Durability to two variants, 3.0 added MessageType variants, 4.0 made MessageType #[non_exhaustive]).

See the workspace README for the full project and the wire protocol docs.