seaweedfs/weed/remote_storage/remote_storage.go
2021-08-15 20:07:13 -07:00

81 lines
2.5 KiB
Go

package remote_storage
import (
"fmt"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"io"
"strings"
"sync"
)
func ParseLocation(remote string) (loc *filer_pb.RemoteStorageLocation) {
loc = &filer_pb.RemoteStorageLocation{}
if strings.HasSuffix(string(remote), "/") {
remote = remote[:len(remote)-1]
}
parts := strings.SplitN(string(remote), "/", 3)
if len(parts) >= 1 {
loc.Name = parts[0]
}
if len(parts) >= 2 {
loc.Bucket = parts[1]
}
loc.Path = string(remote[len(loc.Name)+1+len(loc.Bucket):])
if loc.Path == "" {
loc.Path = "/"
}
return
}
func FormatLocation(loc *filer_pb.RemoteStorageLocation) string {
return fmt.Sprintf("%s/%s%s", loc.Name, loc.Bucket, loc.Path)
}
type VisitFunc func(dir string, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error
type RemoteStorageClient interface {
Traverse(loc *filer_pb.RemoteStorageLocation, visitFn VisitFunc) error
ReadFile(loc *filer_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error)
WriteDirectory(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error)
WriteFile(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error)
UpdateFileMetadata(loc *filer_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error)
DeleteFile(loc *filer_pb.RemoteStorageLocation) (err error)
}
type RemoteStorageClientMaker interface {
Make(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error)
}
var (
RemoteStorageClientMakers = make(map[string]RemoteStorageClientMaker)
remoteStorageClients = make(map[string]RemoteStorageClient)
remoteStorageClientsLock sync.Mutex
)
func makeRemoteStorageClient(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error) {
maker, found := RemoteStorageClientMakers[remoteConf.Type]
if !found {
return nil, fmt.Errorf("remote storage type %s not found", remoteConf.Type)
}
return maker.Make(remoteConf)
}
func GetRemoteStorage(remoteConf *filer_pb.RemoteConf) (RemoteStorageClient, error) {
remoteStorageClientsLock.Lock()
defer remoteStorageClientsLock.Unlock()
existingRemoteStorageClient, found := remoteStorageClients[remoteConf.Name]
if found {
return existingRemoteStorageClient, nil
}
newRemoteStorageClient, err := makeRemoteStorageClient(remoteConf)
if err != nil {
return nil, fmt.Errorf("make remote storage client %s: %v", remoteConf.Name, err)
}
remoteStorageClients[remoteConf.Name] = newRemoteStorageClient
return newRemoteStorageClient, nil
}