ing

server.go

@@ -10,12 +10,6 @@ import (
 	"git.loafle.net/commons_go/logging"
 )
 
-type Server interface {
-	Start() error
-	Stop()
-	Serve() error
-}
-
 func New(sh ServerHandler) Server {
 	s := &server{
 		sh: sh,
@@ -23,6 +17,12 @@ func New(sh ServerHandler) Server {
 	return s
 }
 
+type Server interface {
+	Start() error
+	Stop()
+	Serve() error
+}
+
 type server struct {
 	sh ServerHandler
 
@@ -48,6 +48,10 @@ func (s *server) Start() error {
 		return err
 	}
 
+	if err = s.sh.Init(); nil != err {
+		logging.Logger().Panic(fmt.Sprintf("Server: Initialization of server has been failed %v", err))
+	}
+
 	s.stopChan = make(chan struct{})
 
 	s.sh.OnStart()
@@ -65,7 +69,10 @@ func (s *server) Stop() {
 	close(s.stopChan)
 	s.stopWg.Wait()
 	s.stopChan = nil
+
 	s.sh.OnStop()
+
+	logging.Logger().Info(fmt.Sprintf("Server[%s] is stopped", s.sh.GetName()))
 }
 
 func (s *server) Serve() error {
@@ -90,8 +97,6 @@ func handleServer(s *server) {
 				if stopping.Load() == nil {
 					logging.Logger().Error(fmt.Sprintf("Server: Cannot accept new connection: [%s]", err))
 				}
-			} else {
-				conn, err = s.sh.OnAccept(conn)
 			}
 			close(acceptChan)
 		}()
@@ -124,9 +129,17 @@ func handleServer(s *server) {
 func handleConnection(s *server, conn net.Conn) {
 	defer s.stopWg.Done()
 
+	var err error
+	if conn, err = s.sh.OnConnect(conn); nil != err {
+		logging.Logger().Error(fmt.Sprintf("Server: connecting[%s] failed %v", conn.RemoteAddr(), err))
+		return
+	}
+
 	logging.Logger().Debug(fmt.Sprintf("Server: Client[%s] is connected.", conn.RemoteAddr()))
+
 	clientStopChan := make(chan struct{})
 	handleDoneChan := make(chan struct{})
+
 	go s.sh.Handle(conn, clientStopChan, handleDoneChan)
 
 	select {

server_handler.go

@@ -5,13 +5,44 @@ import (
 )
 
 type ServerHandler interface {
-	Listen() (net.Listener, error)
+	// Init invoked before the server is started
-	OnAccept(conn net.Conn) (net.Conn, error)
+	// If you override ths method, must call
+	//
+	// func (sh *ServerHandler) Init() error {
+	// 	if err := sh.ServerHandler.Init(); nil != err {
+	// 		return err
+	// 	}
+	//  ...
+	// 	return nil
+	// }
+	Init() error
 
+	Listen() (net.Listener, error)
+	// OnStart invoked when server is started
+	// If you override ths method, must call
+	//
+	// func (sh *ServerHandler) OnStart() error {
+	// 	sh.ServerHandler.OnStart()
+	//  ...
+	// 	return nil
+	// }
 	OnStart()
-	OnStop()
+
+	OnConnect(conn net.Conn) (net.Conn, error)
 
 	Handle(conn net.Conn, stopChan <-chan struct{}, doneChan chan<- struct{})
 
+	OnError(status int, reason error)
+	// OnStop invoked when server is stopped
+	// If you override ths method, must call
+	//
+	// func (sh *ServerHandler) OnStop() {
+	//  ...
+	// 	sh.ServerHandler.OnStop()
+	// }
+	OnStop()
+
+	GetName() string
+
 	Validate()
 }

server_handlers.go

@@ -2,26 +2,36 @@ package server
 
 import (
 	"errors"
+	"fmt"
 	"log"
 	"net"
+
+	"git.loafle.net/commons_go/logging"
 )
 
 type ServerHandlers struct {
+	// Server name for sending in response headers.
+	//
+	// Default server name is used if left blank.
+	Name string
 }
 
-func (sh *ServerHandlers) OnStart() {
+func (sh *ServerHandlers) Init() error {
-	// no op
-}
 
-func (sh *ServerHandlers) OnStop() {
+	return nil
-	// no op
 }
 
 func (sh *ServerHandlers) Listen() (net.Listener, error) {
 	return nil, errors.New("Server: Handler method[Listen] of Server is not implement")
 }
 
-func (sh *ServerHandlers) OnAccept(conn net.Conn) (net.Conn, error) {
+// OnStart invoked when server is stated
+// If you override ths method, must call
+func (sh *ServerHandlers) OnStart() {
+	// no op
+}
+
+func (sh *ServerHandlers) OnConnect(conn net.Conn) (net.Conn, error) {
 	return conn, nil
 }
 
@@ -29,6 +39,20 @@ func (sh *ServerHandlers) Handle(conn net.Conn, stopChan <-chan struct{}, doneCh
 	log.Printf("Server.Handle")
 }
 
+func (sh *ServerHandlers) OnError(status int, reason error) {
+	logging.Logger().Error(fmt.Sprintf("Server: error status: %d, reason: %v", status, reason))
+}
+
+// OnStop invoked when server is stopped
+// If you override ths method, must call
+func (sh *ServerHandlers) OnStop() {
+	// no op
+}
+
+func (sh *ServerHandlers) GetName() string {
+	return sh.Name
+}
+
 func (sh *ServerHandlers) Validate() {
 
 }