graceful shutdown, CoreInterface changes, MongoDB official driver is the only DB backend

registry.go

@@ -1,5 +1,10 @@
 package main
 
+import (
+	"fmt"
+	"github.com/davecgh/go-spew/spew"
+)
+
 type PluginRegistry struct {
 	CorePlugin    map[string]CoreInterface
 	HandlerPlugin map[string]HandlerInterface
@@ -13,6 +18,7 @@ func NewPluginRegistry() *PluginRegistry {
 }
 
 func (r *PluginRegistry) RegisterCorePlugin(plugin CoreInterface) error {
+	spew.Dump(plugin)
 	name, e := plugin.Register()
 	if e != nil {
 		return e
@@ -45,3 +51,34 @@ func (r *PluginRegistry) RemoveCorePlugin(name string) {
 func (r *PluginRegistry) RemoveHandlerPlugin(name string) {
 	delete(r.HandlerPlugin, name)
 }
+
+func (r *PluginRegistry) Run() error {
+	for _, v := range r.CorePlugin {
+		if e := v.BeforeRun(); e != nil {
+			return e
+		}
+	}
+	for _, v := range r.CorePlugin {
+		if e := v.Run(); e != nil {
+			return e
+		}
+	}
+	for _, v := range r.CorePlugin {
+		if e := v.AfterRun(); e != nil {
+			return e
+		}
+	}
+	return nil
+}
+
+func (r *PluginRegistry) Shutdown() {
+	fmt.Println("Registry: Shutdown")
+	spew.Dump(r.CorePlugin)
+	for k, v := range r.CorePlugin {
+		fmt.Println(k, v)
+		if e := v.UnRegister(); e != nil {
+			panic(e)
+		}
+	}
+	fmt.Println("Registry: Shutdown Done")
+}