Big changes

server/internal/api/maintenance.go

@@ -89,14 +89,31 @@ func (s *Server) maintenanceGate(next http.Handler) http.Handler {
 // handleServiceStatus is the live control channel clients poll while the app is open.
 // It sits outside maintenanceGate so maintenance can interrupt playback rather than only
 // being discovered the next time a content request happens to run.
-func (s *Server) handleServiceStatus(w http.ResponseWriter, _ *http.Request, _ store.Session) {
+// It also carries informational alerts, because this poll is the one thing the app is
+// already listening to — a push channel would be a second connection for a banner.
+func (s *Server) handleServiceStatus(w http.ResponseWriter, r *http.Request, _ store.Session) {
 	state := s.maintenance.get()
 	message := state.Message
 	if state.Enabled && message == "" {
 		message = store.DefaultMaintenanceMessage
 	}
+	alerts := []clientAlert{}
+	// Nothing to celebrate while the service is down, and the client is showing the
+	// maintenance screen anyway.
+	if !state.Enabled {
+		if found := s.sonarrAiredAlerts(r.Context()); len(found) > 0 {
+			alerts = found
+		}
+	}
+	compatible, compatibilityMessage := compatibilityFor(r)
 	writeJSON(w, http.StatusOK, map[string]any{
-		"maintenance": state.Enabled,
-		"message":     message,
+		"maintenance":          state.Enabled,
+		"message":              message,
+		"alerts":               alerts,
+		"compatible":           compatible,
+		"compatibilityMessage": compatibilityMessage,
+		"clientVersion":        clientVersion(r),
+		"clientProtocol":       clientProtocol(r),
+		"serverProtocol":       membyProtocolVersion,
 	})
 }