optimize seq, specifying that seq is stored in the only certain unknown

internal/msggateway/options.go

@@ -0,0 +1,36 @@
+package msggateway
+
+import "time"
+
+type Option func(opt *configs)
+type configs struct {
+	//长连接监听端口
+	port int
+	//长连接允许最大链接数
+	maxConnNum int64
+	//连接握手超时时间
+	handshakeTimeout time.Duration
+	//允许消息最大长度
+	messageMaxMsgLength int
+}
+
+func WithPort(port int) Option {
+	return func(opt *configs) {
+		opt.port = port
+	}
+}
+func WithMaxConnNum(num int64) Option {
+	return func(opt *configs) {
+		opt.maxConnNum = num
+	}
+}
+func WithHandshakeTimeout(t time.Duration) Option {
+	return func(opt *configs) {
+		opt.handshakeTimeout = t
+	}
+}
+func WithMessageMaxMsgLength(length int) Option {
+	return func(opt *configs) {
+		opt.messageMaxMsgLength = length
+	}
+}