feat: signal server tag

toju-app/src/app/infrastructure/realtime/realtime.constants.ts

@@ -23,6 +23,10 @@ export const PEER_DISCONNECT_GRACE_MS = 10_000;
 export const STATE_HEARTBEAT_INTERVAL_MS = 5_000;
 /** Interval (ms) for application-level signaling keepalive messages */
 export const SIGNALING_KEEPALIVE_INTERVAL_MS = 25_000;
+/** How long to wait for a keepalive_ack before treating the socket as dead (ms) */
+export const SIGNALING_KEEPALIVE_ACK_TIMEOUT_MS = 10_000;
+/** How often to probe the signaling HTTP health endpoint while connected (ms) */
+export const SIGNALING_HEALTH_PROBE_INTERVAL_MS = 5_000;
 /** Interval (ms) for broadcasting voice presence */
 export const VOICE_HEARTBEAT_INTERVAL_MS = 5_000;
 
@@ -82,6 +86,20 @@ export const SIGNALING_TYPE_USER_JOINED = 'user_joined';
 export const SIGNALING_TYPE_USER_LEFT = 'user_left';
 export const SIGNALING_TYPE_ACCESS_DENIED = 'access_denied';
 export const SIGNALING_TYPE_KEEPALIVE = 'keepalive';
+export const SIGNALING_TYPE_KEEPALIVE_ACK = 'keepalive_ack';
+
+/** Signaling payloads that can be dropped quietly while the socket is reconnecting. */
+export const TRANSIENT_SIGNALING_OUTBOUND_TYPES = new Set<string>([
+  SIGNALING_TYPE_ICE_CANDIDATE,
+  SIGNALING_TYPE_OFFER,
+  SIGNALING_TYPE_ANSWER,
+  SIGNALING_TYPE_KEEPALIVE,
+  'status_update'
+]);
+
+export function isTransientSignalingOutboundType(type: string | undefined): boolean {
+  return typeof type === 'string' && TRANSIENT_SIGNALING_OUTBOUND_TYPES.has(type);
+}
 
 export const P2P_TYPE_STATE_REQUEST = 'state-request';
 export const P2P_TYPE_VOICE_STATE_REQUEST = 'voice-state-request';