add comments, code refactor

pkg/requestid/request_id_container.go

@@ -4,14 +4,17 @@ import (
 	"github.com/mayswind/lab/pkg/settings"
 )
 
+// RequestIdContainer contains the current request id generator
 type RequestIdContainer struct {
 	Current RequestIdGenerator
 }
 
+// Initialize a request id container singleton instance
 var (
 	Container = &RequestIdContainer{}
 )
 
+// InitializeRequestIdGenerator initialized the current request id generator according to the config
 func InitializeRequestIdGenerator(config *settings.Config) error {
 	generator, err := NewDefaultRequestIdGenerator(config)
 
@@ -23,6 +26,7 @@ func InitializeRequestIdGenerator(config *settings.Config) error {
 	return nil
 }
 
+// GenerateRequestId returns a new request id by the current request id generator
 func (u *RequestIdContainer) GenerateRequestId(clientIpAddr string) string {
 	return u.Current.GenerateRequestId(clientIpAddr)
 }