Replace the hand-rolled WebSocket implementation with a transport
boundary (Frame over any Sink/Stream) plus adapters for tokio-tungstenite
(server/client features) and axum (axum feature). The JSON wire format
is unchanged, so existing peers keep working.
Fixes:
- unbounded frame lengths were allocated up front; the server now
enforces message/frame size limits (1 MiB default)
- responses arriving before `request` subscribed were lost
- an accept() error ended `session_loop`
- requests sent right after connecting could arrive before handlers
were registered; the receiver now starts after `on_conn` returns
- panics in the receive loop skipped `on_close` and leaked sessions;
`on_close` now runs exactly once and handler panics fail only their
request
- unknown methods and invalid data got no reply; they now get an
error response
- slow handlers blocked pongs and responses
Adds `on_notification`, `request_timeout`, `closed`, `is_closed`, `id`,
`ServerConfig`, `from_transport`, `from_tungstenite` and `from_axum`,
integration tests, and an axum example. Bumps to 0.2.0 since
`Session::connect` now takes a URL and the `ws` module is removed.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
selimaj-devandclaude