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package backend
import (
"io"
"os"
"time"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/spf13/viper"
)
type BackendStorageFile interface {
io.ReaderAt
io.WriterAt
Truncate(off int64) error
io.Closer
GetStat() (datSize int64, modTime time.Time, err error)
String() string
Instantiate(src *os.File) error
}
type BackendStorage interface {
Name() string
NewStorageFile(key string) BackendStorageFile
}
type StorageType string
type BackendStorageFactory interface {
StorageType() StorageType
BuildStorage(configuration util.Configuration, id string) (BackendStorage, error)
}
var (
BackendStorageFactories = make(map[StorageType]BackendStorageFactory)
BackendStorages = make(map[string]BackendStorage)
)
func LoadConfiguration(config *viper.Viper) {
StorageBackendPrefix := "storage.backend"
backendSub := config.Sub(StorageBackendPrefix)
for backendTypeName, _ := range config.GetStringMap(StorageBackendPrefix) {
backendStorageFactory, found := BackendStorageFactories[StorageType(backendTypeName)]
if !found {
glog.Fatalf("backend storage type %s not found", backendTypeName)
}
backendTypeSub := backendSub.Sub(backendTypeName)
for backendStorageId, _ := range backendSub.GetStringMap(backendTypeName) {
backendStorage, buildErr := backendStorageFactory.BuildStorage(backendTypeSub.Sub(backendStorageId), backendStorageId)
if buildErr != nil {
glog.Fatalf("fail to create backend storage %s.%s", backendTypeName, backendStorageId)
}
BackendStorages[backendTypeName+"."+backendStorageId] = backendStorage
if backendStorageId == "default" {
BackendStorages[backendTypeName] = backendStorage
}
}
}
}
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