working on List

mongo.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"context"
+	"errors"
 	"strings"
 	"time"
 
@@ -53,6 +54,10 @@ func NewMongo(addr string, auth ...string) (*Mongo, error) {
 	return &Mongo{db: db}, nil
 }
 
+func (mg *Mongo) List(ns []string, limits ...string) ([]string, error) {
+	return nil, errors.New("not impl")
+}
+
 func (mg *Mongo) Get(key string, ns ...string) ([]byte, error) {
 	namespace := resolveNamespace(ns)
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)