Implement list and fix test

minio.go

@@ -2,7 +2,6 @@ package storage
 
 import (
 	"bytes"
-	"errors"
 	"io/ioutil"
 	"strings"
 
@@ -19,7 +18,20 @@ func NewMinio(addr, user, pass string) (*Minio, error) {
 }
 
 func (m *Minio) List(ns []string, limits ...string) ([]string, error) {
-	return nil, errors.New("not impl")
+	namespace := resolveNamespace(ns)
+	limits = resolveLimits(limits)
+	done := make(chan struct{})
+	defer close(done)
+	keys := []string{}
+	for resp := range m.db.ListObjects(namespace, "", true, done) {
+		if resp.Key < limits[0] {
+			continue
+		} else if resp.Key > limits[1] {
+			break
+		}
+		keys = append(keys, resp.Key)
+	}
+	return keys, nil
 }
 
 func (m *Minio) Get(key string, ns ...string) ([]byte, error) {