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storage.go
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storage.go
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// Copyright 2015 CloudAwan LLC
//
// 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 authorization
import (
"errors"
"github.com/cloudawan/cloudone/utility/configuration"
"github.com/cloudawan/cloudone_utility/rbac"
)
var storage Storage = nil
func GetStorage() Storage {
switch storage.(type) {
case nil:
if err := ReloadStorage(configuration.StorageTypeDefault); err != nil {
log.Error(err)
log.Critical("Fail to load storage and use dummy")
if err := ReloadStorage(configuration.StorageTypeDummy); err != nil {
log.Error(err)
}
}
case *StorageDummy:
// If dummy, will retry to use default storage every configured interval
if storage.(*StorageDummy).ShouldCheck() {
// If fail to reload, it will use the previous one
if err := ReloadStorage(configuration.StorageTypeDefault); err != nil {
log.Error(err)
}
}
}
return storage
}
func ReloadStorage(storageType int) error {
switch storageType {
default:
return errors.New("Not supported type")
case configuration.StorageTypeDefault:
// If not indicated, use default
storageTypeDefault, err := configuration.GetStorageTypeDefault()
if err != nil {
log.Error(err)
return ReloadStorage(configuration.StorageTypeDummy)
} else {
return ReloadStorage(storageTypeDefault)
}
case configuration.StorageTypeDummy:
newStorage := &StorageDummy{}
err := newStorage.initialize()
if err == nil {
storage = newStorage
}
return err
case configuration.StorageTypeCassandra:
return errors.New("Not supported type")
case configuration.StorageTypeEtcd:
newStorage := &StorageEtcd{}
err := newStorage.initialize()
if err == nil {
storage = newStorage
}
return err
}
}
type Storage interface {
initialize() error
DeleteUser(name string) error
SaveUser(user *rbac.User) error
LoadUser(name string) (*rbac.User, error)
LoadAllUser() ([]rbac.User, error)
DeleteRole(name string) error
SaveRole(role *rbac.Role) error
LoadRole(name string) (*rbac.Role, error)
LoadAllRole() ([]rbac.Role, error)
}