Crate weir_core 

Core wire-protocol types shared by the weir daemon, client, and sink SDK.

weir-core is the dependency-light foundation of the weir workspace: it defines the v1 binary frame format and nothing else (no I/O, no async, no daemon logic). Everything that crosses the socket is built from these types.

What’s here

• Envelope / Header — a complete wire frame and its 16-byte header, with encode/decode that own the CRC and validation order.
• MessageType / Durability / NackReason — the fixed-repr enums carried in the header and Nack payloads, each with a TryFrom<u8> whose error is UnknownMessageType / UnknownDurability / UnknownNackReason (re-exported here alongside the enums).
• Payload — opaque, ref-counted payload bytes (O(1) clone).
• DecodeError / WeirError — the decode failure taxonomy.
• WIRE_VERSION / MAX_PAYLOAD_HARD_CAP / HEADER_LEN / MIN_FRAME_LEN — the protocol constants.

The wire format itself is specified in docs/wire_protocol.md; this crate is its executable reference (see tests/reference_frames.rs).

Re-exports

pub use durability::Durability;

pub use durability::UnknownDurability;

pub use envelope::Envelope;

pub use envelope::HEADER_LEN;

pub use envelope::Header;

pub use envelope::MIN_FRAME_LEN;

pub use envelope::MessageType;

pub use envelope::UnknownMessageType;

pub use error::DecodeError;

pub use error::WeirError;

pub use nack::NackReason;

pub use nack::UnknownNackReason;

pub use payload::Payload;

pub use version::MAX_PAYLOAD_HARD_CAP;

pub use version::WIRE_VERSION;

Modules

durability

The Durability tier — the per-record durability guarantee a producer requests in the frame header.

envelope

The weir wire frame: Header (the 16-byte fixed header) and Envelope (header + payload), with the encode/decode codecs that own CRC computation and the DoS-resistant validation order.

error

The decode failure taxonomy: DecodeError (one variant per frame-validation step, which the daemon maps to a Nack reason) and the top-level WeirError.

nack

The NackReason byte that prefixes every Nack message payload.

payload

The opaque payload byte buffer carried end-to-end through weir.

version

Wire-protocol version and the absolute payload-size ceiling — the protocol constants every layer shares.