fix bugs and make it run basically

pkg/port/service.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2015 The GoStor Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package port
+
+import (
+	"fmt"
+
+	"github.com/gostor/gotgt/pkg/scsi"
+)
+
+type SCSITargetService interface {
+	Run() error
+	NewTarget(string) (SCSITargetDriver, error)
+}
+
+type TargetServiceFunc func(*scsi.SCSITargetService) (SCSITargetService, error)
+
+var registeredPlugins = map[string](TargetServiceFunc){}
+
+func RegisterTargetService(name string, f TargetServiceFunc) {
+	registeredPlugins[name] = f
+}
+
+func NewTargetService(name string, s *scsi.SCSITargetService) (SCSITargetService, error) {
+	if name == "" {
+		return nil, nil
+	}
+	f, ok := registeredPlugins[name]
+	if !ok {
+		return nil, fmt.Errorf("SCSI target driver %s is not found.", name)
+	}
+	return f(s)
+}