perf(cmpp): process inbound submits within client window

gateway/internal/inbound/authentication.go

@@ -9,6 +9,7 @@ import (
 	"net"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 )
 
@@ -28,6 +29,7 @@ type authResponse struct {
 	Account        string `json:"account"`
 	EnterpriseCode string `json:"enterpriseCode"`
 	MaxConnections int    `json:"maxConnections"`
+	WindowSize     int    `json:"windowSize"`
 }
 
 func (s Server) handleLogin(response *cmpp.Response, packet *cmpp.Packet, logger *log.Logger) (bool, error) {
@@ -59,6 +61,8 @@ func (s Server) handleLogin(response *cmpp.Response, packet *cmpp.Packet, logger
 		applicationID:  strings.TrimSpace(auth.ApplicationID),
 		enterpriseCode: strings.TrimSpace(auth.EnterpriseCode),
 		protocol:       cmppVersionName(req.Version),
+		windowSize:     boundedSubmitWindow(auth.WindowSize, s.MaxSubmitConcurrency),
+		submitInFlight: &atomic.Int64{},
 		srcID:          strings.TrimSpace(auth.Account),
 		remoteIP:       remoteIP(packet.Conn.Conn.RemoteAddr()),
 		connectedAt:    now,