Module header 

RPC frame header layout and framing helpers.

Current layout (18 bytes)

┌─────────┬──────────┬────────────┬──────────┬───────────────┬─────────────────────┐
│ version │ rpc_type │ payload_len│ crc32c   │ cluster_epoch │ rkyv payload bytes  │
│  1 byte │  1 byte  │  4 bytes   │ 4 bytes  │   8 bytes LE  │  payload_len bytes  │
└─────────┴──────────┴────────────┴──────────┴───────────────┴─────────────────────┘

Every frame is emitted with RPC_FRAME_VERSION in the version byte. Frames with any other version byte are rejected immediately.

Constants

HEADER_SIZE

Header size in bytes: version(1) + rpc_type(1) + payload_len(4) + crc32c(4) + cluster_epoch(8).

MAX_RPC_PAYLOAD_SIZE

Maximum RPC message payload size (64 MiB). Distinct from WAL’s MAX_RPC_PAYLOAD_SIZE.

Functions

frame_size

Return the total frame size for a buffer that starts with a valid header.

parse_frame

Validate the CRC32C of an inbound frame and return the payload slice.

write_frame

Write a framed v3 header + payload into out.