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store_mgr.go
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store_mgr.go
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/*
* Copyright The Dragonfly Authors.
*
* 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 store
import (
"fmt"
"path"
"sync"
"github.com/dragonflyoss/Dragonfly/supernode/config"
"github.com/dragonflyoss/Dragonfly/supernode/plugins"
)
// StorageBuilder is a function that creates a new storage plugin instant
// with the giving conf.
type StorageBuilder func(conf string) (StorageDriver, error)
// Register defines an interface to register a driver with specified name.
// All drivers should call this function to register itself to the driverFactory.
func Register(name string, builder StorageBuilder) {
var f plugins.Builder = func(conf string) (plugin plugins.Plugin, e error) {
return NewStore(name, builder, conf)
}
plugins.RegisterPlugin(config.StoragePlugin, name, f)
}
// Manager manage stores.
type Manager struct {
cfg *config.Config
defaultStorage *Store
mutex sync.Mutex
}
// NewManager create a store manager.
func NewManager(cfg *config.Config) (*Manager, error) {
return &Manager{
cfg: cfg,
}, nil
}
// Get a store from manager with specified name.
func (sm *Manager) Get(name string) (*Store, error) {
v := plugins.GetPlugin(config.StoragePlugin, name)
if v == nil {
if name == LocalStorageDriver {
return sm.getDefaultStorage()
}
return nil, fmt.Errorf("not existed storage: %s", name)
}
if store, ok := v.(*Store); ok {
return store, nil
}
return nil, fmt.Errorf("get store error: unknown reason")
}
func (sm *Manager) getDefaultStorage() (*Store, error) {
if sm.defaultStorage != nil {
return sm.defaultStorage, nil
}
sm.mutex.Lock()
defer sm.mutex.Unlock()
// check again to avoid initializing repeatedly
if sm.defaultStorage != nil {
return sm.defaultStorage, nil
}
if sm.cfg == nil {
return nil, fmt.Errorf("cannot init local storage without home path")
}
cfg := fmt.Sprintf("baseDir: %s", path.Join(sm.cfg.HomeDir, "repo"))
s, err := NewStore(LocalStorageDriver, NewLocalStorage, cfg)
if err != nil {
return nil, err
}
sm.defaultStorage = s
return sm.defaultStorage, nil
}