Configure QUIC fabric idle TTL

agents/rap-node-agent/internal/config/config.go

@@ -31,6 +31,7 @@ type Config struct {
 	MeshQUICFabricEnabled                 bool
 	MeshQUICFabricListenAddr              string
 	VPNFabricQUICMaxStreamsPerConn        int
+	VPNFabricQUICIdleTTL                  time.Duration
 	MeshProductionObservationSinkCapacity int
 	MeshListenAddr                        string
 	MeshListenPortMode                    string
@@ -73,6 +74,7 @@ func Load(args []string, env map[string]string) (Config, error) {
 	fs.BoolVar(&cfg.MeshQUICFabricEnabled, "mesh-quic-fabric-enabled", getEnvBool(env, "RAP_MESH_QUIC_FABRIC_ENABLED", false), "Enable QUIC/UDP fabric listener. Disabled by default.")
 	fs.StringVar(&cfg.MeshQUICFabricListenAddr, "mesh-quic-fabric-listen-addr", getEnv(env, "RAP_MESH_QUIC_FABRIC_LISTEN_ADDR", ""), "Listen address for QUIC/UDP fabric endpoint, for example :19443.")
 	fs.IntVar(&cfg.VPNFabricQUICMaxStreamsPerConn, "vpn-fabric-quic-max-streams-per-conn", getEnvInt(env, "RAP_VPN_FABRIC_QUIC_MAX_STREAMS_PER_CONN", 64), "Maximum logical fabric-session streams per cached VPN QUIC carrier connection.")
+	fs.DurationVar(&cfg.VPNFabricQUICIdleTTL, "vpn-fabric-quic-idle-ttl", time.Duration(getEnvInt(env, "RAP_VPN_FABRIC_QUIC_IDLE_TTL_SECONDS", 300))*time.Second, "Idle TTL for cached VPN QUIC carrier connections.")
 	fs.IntVar(&cfg.MeshProductionObservationSinkCapacity, "mesh-production-observation-sink-capacity", getEnvSignedInt(env, "RAP_MESH_PRODUCTION_OBSERVATION_SINK_CAPACITY", 0), "Bounded local metadata-only production envelope observation sink capacity. Disabled when 0.")
 	fs.StringVar(&cfg.MeshListenAddr, "mesh-listen-addr", getEnv(env, "RAP_MESH_LISTEN_ADDR", ""), "Listen address for disabled-by-default C17E synthetic mesh HTTP endpoint.")
 	fs.StringVar(&cfg.MeshListenPortMode, "mesh-listen-port-mode", getEnv(env, "RAP_MESH_LISTEN_PORT_MODE", "manual"), "Mesh listen port behavior: manual, auto, or disabled.")
@@ -113,6 +115,9 @@ func Load(args []string, env map[string]string) (Config, error) {
 	if cfg.VPNFabricQUICMaxStreamsPerConn <= 0 {
 		cfg.VPNFabricQUICMaxStreamsPerConn = 64
 	}
+	if cfg.VPNFabricQUICIdleTTL <= 0 {
+		cfg.VPNFabricQUICIdleTTL = 5 * time.Minute
+	}
 	cfg.MeshAdvertiseEndpoint = strings.TrimRight(strings.TrimSpace(cfg.MeshAdvertiseEndpoint), "/")
 	cfg.MeshAdvertiseEndpointsJSON = strings.TrimSpace(cfg.MeshAdvertiseEndpointsJSON)
 	cfg.MeshAdvertiseTransport = strings.TrimSpace(cfg.MeshAdvertiseTransport)