Make connection multiplexing configurable

config/config.go

@@ -58,6 +58,8 @@ const (
 
 	OptionTypeAntiReplayMaxSize
 
+	OptionTypeMultiplexPerConnection
+
 	OptionTypeSecret
 	OptionTypeAdtag
 )
@@ -80,6 +82,8 @@ type Config struct {
 
 	AntiReplayMaxSize int64 `json:"anti_replay_max_size"`
 
+	MultiplexPerConnection int `json:"multiplex_per_connection"`
+
 	Debug            bool             `json:"debug"`
 	Verbose          bool             `json:"verbose"`
 	StatsdTagsFormat statsd.TagFormat `json:"statsd_tags_format"`
@@ -149,6 +153,8 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 			C.CloakPort = int(opt.Value.(uint16))
 		case OptionTypeAntiReplayMaxSize:
 			C.AntiReplayMaxSize = int64(opt.Value.(units.Base2Bytes))
+		case OptionTypeMultiplexPerConnection:
+			C.MultiplexPerConnection = int(opt.Value.(uint))
 		case OptionTypeSecret:
 			C.Secret = opt.Value.([]byte)
 		case OptionTypeAdtag:
@@ -173,6 +179,10 @@ func Init(options ...Opt) error { // nolint: gocyclo, funlen
 		return errors.New("incorrect secret")
 	}
 
+	if C.MultiplexPerConnection == 0 {
+		return errors.New("cannot use 0 clients per connection for multiplexing")
+	}
+
 	if C.CloakHost != "" {
 		addrs, err := net.LookupHost(C.CloakHost)
 		if err != nil {