perf(cmpp): process inbound submits within client window

gateway/internal/inbound/server.go

@@ -20,6 +20,7 @@ type Server struct {
 	PresenceStore        PresenceStore
 	RecoveryStore        RecoveryStore
 	GatewayInstanceID    string
+	MaxSubmitConcurrency int
 }
 
 func (s Server) ListenAndServe() error {
@@ -30,9 +31,19 @@ func (s Server) ListenAndServe() error {
 	s.logRecoveryCandidates(log.Default())
 	go s.recoverPendingCandidates(log.Default())
 	go s.runPendingFlusher(log.Default())
-	return cmpp.ListenAndServeWithClose(addr, cmpp.V30, 30*time.Second, 3, s.LogWriter, s.handleConnectionClosed,
+	return cmpp.ListenAndServeWithCloseAndSubmitWindow(addr, cmpp.V30, 30*time.Second, 3, s.LogWriter, s.handleConnectionClosed, submitWindowByConn,
 		cmpp.HandlerFunc(s.handleLogin),
 		cmpp.HandlerFunc(s.handleSubmit),
 		cmpp.HandlerFunc(s.handleActivity),
 	)
 }
+
+func boundedSubmitWindow(applicationWindow int, gatewayMaximum int) int {
+	if applicationWindow < 1 {
+		applicationWindow = 1
+	}
+	if gatewayMaximum < 1 {
+		gatewayMaximum = 64
+	}
+	return min(applicationWindow, min(gatewayMaximum, 1024))
+}