Module codec 

JSON-line framing codec shared by link transports.

The link wire convention is one serde-JSON document per line (the same convention as the debug server). Transports add the \n framing themselves: a TCP transport writes the line to a socket, a Web BroadcastChannel transport posts it as a string. Both share encode_line/decode_line so framing stays byte-identical across transports.

This module is pure serde — no I/O, no platform calls — which is why it lives in the engine (the zero-I/O layer) while the transports that use it live in the game or platform layer.

Broadcast-style channels deliver every post to EVERY participant on the channel — including the sender’s own — so broadcast frames are wrapped in a Frame envelope carrying a random per-session tag, and receivers drop frames whose tag is their own (Frame::is_self). The envelope is pure serde, so it is defined (and tested) here rather than inside any one transport.

Structs

Frame

A broadcast-channel frame: the sender’s per-session tag plus the protocol message.

Functions

decode_line

Deserialize one JSON line.

encode_line

Serialize a value as one JSON line (no trailing newline — the transports add the \n framing themselves).