Queue Pion state, candidate and selected-pair notifications together with ICE dial results. Move worker state updates to the peer event loop and expose atomic snapshots to signaling and the reconnection guard.
Keep the existing session ownership checks and disconnect behavior. Release dial results when the mailbox cannot deliver them.
Move the signaling protocol out of the peer package into
client/internal/peer/signaling: OfferAnswer, IceCredentials, Handshaker
and Signaler. Break the peer<->signaling cycle by giving the Handshaker
a plain Config and an ICEWorker interface instead of *Conn/*WorkerICE,
and by passing the relay manager directly rather than the relay worker.
Combine the ICE worker's local-credentials and session-id accessors into
a single Credentials() returning a Credentials struct.
Move the ICE session id to the ice package as ice.SessionID, since it
identifies an ICE agent session and is minted there alongside
GenerateICECredentials; signaling only carries it.
Replace the mutex-guarded callback model of peer.Conn with a per-peer
event loop that exclusively owns all mutable connection state. External
callers and transport workers post typed events into a non-blocking,
coalescing mailbox instead of contending on conn.mu:
- offers/answers coalesce to the newest message, a new offer flushes
queued candidates of the superseded session
- candidates are applied in arrival order from a bounded FIFO
- transport state changes are never dropped
- the blocking relay dial runs on a helper goroutine with a single dial
in flight; signaling I/O (offer/answer sends) runs off the loop
conn.mu now only guards the open/close lifecycle. Close posts a close
event and waits for the loop teardown; the loop also tears down on
engine context cancellation and releases resources of unprocessed
events.
Delete the Handshaker listener machinery (Listen loop, unbuffered
drop-on-busy channels, AsyncOfferListener with its double-processing of
the first offer), the never-wired dispatcher package and the unused
ICEMonitor.ReconnectCh. Fix a goroutine leak in the WG watcher test
that raced with tests mutating the package-level check timing vars.
Zoltán Papp