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factory.go
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factory.go
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// Copyright 2019 The OpenSDS 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 yig
import (
"errors"
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
log "github.com/sirupsen/logrus"
"github.com/opensds/multi-cloud/backend/pkg/utils/constants"
backend "github.com/opensds/multi-cloud/backend/proto"
"github.com/opensds/multi-cloud/s3/pkg/datastore/driver"
"github.com/opensds/multi-cloud/s3/pkg/datastore/yig/config"
_ "github.com/opensds/multi-cloud/s3/pkg/datastore/yig/meta/db"
"github.com/opensds/multi-cloud/s3/pkg/datastore/yig/storage"
)
type YigDriverFactory struct {
Drivers sync.Map
cfgWatcher *config.ConfigWatcher
initLock sync.Mutex
initFlag int32
}
func (ydf *YigDriverFactory) CreateDriver(backend *backend.BackendDetail) (driver.StorageDriver, error) {
err := ydf.Init()
if err != nil {
log.Errorf("failed to perform YigDriverFactory init, err: %v", err)
return nil, err
}
// if driver already exists, just return it.
if driver, ok := ydf.Drivers.Load(backend.Endpoint); ok {
return driver.(*storage.YigStorage), nil
}
log.Infof("no storage driver for yig endpoint %s", backend.Endpoint)
return nil, errors.New(fmt.Sprintf("no storage driver for yig endpoint: %s", backend.Endpoint))
}
func (ydf *YigDriverFactory) Init() error {
// check
if atomic.LoadInt32(&ydf.initFlag) == 1 {
return nil
}
// lock
ydf.initLock.Lock()
defer ydf.initLock.Unlock()
// check
if ydf.initFlag == 1 {
return nil
}
// create the driver.
rand.Seed(time.Now().UnixNano())
// read the config.
err := config.ReadConfigs("/etc/yig", ydf.driverInit)
if err != nil {
log.Errorf("failed to read yig configs, err: %v", err)
return nil
}
// init config watcher.
watcher, err := config.NewConfigWatcher(ydf.driverInit)
if err != nil {
log.Errorf("failed to new config watcher, err: %v", err)
return err
}
ydf.cfgWatcher = watcher
ydf.cfgWatcher.Watch("/etc/yig")
atomic.StoreInt32(&ydf.initFlag, 1)
return nil
}
func (ydf *YigDriverFactory) Close() {
var keys []interface{}
// stop config watcher
if ydf.cfgWatcher != nil {
ydf.cfgWatcher.Stop()
}
// close the drivers
ydf.Drivers.Range(func(k, v interface{}) bool {
drv := v.(*storage.YigStorage)
drv.Close()
keys = append(keys, k)
return true
})
// remove the drivers
for _, k := range keys {
ydf.Drivers.Delete(k)
}
}
func (ydf *YigDriverFactory) driverInit(cfg *config.Config) error {
yigStorage, err := storage.New(cfg)
if err != nil {
log.Errorf("failed to create driver for %s, err: %v", cfg.Endpoint.Url, err)
return err
}
ydf.Drivers.Store(cfg.Endpoint.Url, yigStorage)
return nil
}
func init() {
yigDf := &YigDriverFactory{}
err := yigDf.Init()
if err != nil {
return
}
driver.AddCloser(yigDf)
driver.RegisterDriverFactory(constants.BackendTypeYIGS3, yigDf)
}