refactor server to support variable options

backend/pkgs/server/server_options.go

@@ -0,0 +1,47 @@
+package server
+
+import "time"
+
+type Option = func(s *Server) error
+
+func WithWorker(w Worker) Option {
+	return func(s *Server) error {
+		s.Worker = w
+		return nil
+	}
+}
+
+func WithHost(host string) Option {
+	return func(s *Server) error {
+		s.Host = host
+		return nil
+	}
+}
+
+func WithPort(port string) Option {
+	return func(s *Server) error {
+		s.Port = port
+		return nil
+	}
+}
+
+func WithReadTimeout(seconds int) Option {
+	return func(s *Server) error {
+		s.readTimeout = time.Duration(seconds) * time.Second
+		return nil
+	}
+}
+
+func WithWriteTimeout(seconds int) Option {
+	return func(s *Server) error {
+		s.writeTimeout = time.Duration(seconds) * time.Second
+		return nil
+	}
+}
+
+func WithIdleTimeout(seconds int) Option {
+	return func(s *Server) error {
+		s.idleTimeout = time.Duration(seconds) * time.Second
+		return nil
+	}
+}