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121 lines
3.5 KiB
121 lines
3.5 KiB
package filer
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import (
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/remote_pb"
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"google.golang.org/grpc"
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"google.golang.org/protobuf/proto"
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)
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func ReadMountMappings(grpcDialOption grpc.DialOption, filerAddress pb.ServerAddress) (mappings *remote_pb.RemoteStorageMapping, readErr error) {
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var oldContent []byte
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if readErr = pb.WithFilerClient(false, filerAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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oldContent, readErr = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
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return readErr
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}); readErr != nil {
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return nil, readErr
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}
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mappings, readErr = UnmarshalRemoteStorageMappings(oldContent)
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if readErr != nil {
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return nil, fmt.Errorf("unmarshal mappings: %v", readErr)
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}
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return
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}
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func InsertMountMapping(filerClient filer_pb.FilerClient, dir string, remoteStorageLocation *remote_pb.RemoteStorageLocation) (err error) {
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// read current mapping
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var oldContent, newContent []byte
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err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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oldContent, err = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
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return err
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})
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if err != nil {
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if err != filer_pb.ErrNotFound {
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return fmt.Errorf("read existing mapping: %v", err)
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}
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}
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// add new mapping
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newContent, err = addRemoteStorageMapping(oldContent, dir, remoteStorageLocation)
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if err != nil {
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return fmt.Errorf("add mapping %s~%s: %v", dir, remoteStorageLocation, err)
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}
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// save back
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err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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return SaveInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, newContent)
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})
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if err != nil {
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return fmt.Errorf("save mapping: %v", err)
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}
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return nil
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}
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func DeleteMountMapping(filerClient filer_pb.FilerClient, dir string) (err error) {
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// read current mapping
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var oldContent, newContent []byte
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err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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oldContent, err = ReadInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE)
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return err
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})
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if err != nil {
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if err != filer_pb.ErrNotFound {
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return fmt.Errorf("read existing mapping: %v", err)
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}
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}
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// add new mapping
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newContent, err = removeRemoteStorageMapping(oldContent, dir)
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if err != nil {
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return fmt.Errorf("delete mount %s: %v", dir, err)
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}
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// save back
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err = filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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return SaveInsideFiler(client, DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, newContent)
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})
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if err != nil {
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return fmt.Errorf("save mapping: %v", err)
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}
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return nil
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}
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func addRemoteStorageMapping(oldContent []byte, dir string, storageLocation *remote_pb.RemoteStorageLocation) (newContent []byte, err error) {
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mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
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if unmarshalErr != nil {
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// skip
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}
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// set the new mapping
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mappings.Mappings[dir] = storageLocation
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if newContent, err = proto.Marshal(mappings); err != nil {
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return oldContent, fmt.Errorf("marshal mappings: %v", err)
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}
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return
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}
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func removeRemoteStorageMapping(oldContent []byte, dir string) (newContent []byte, err error) {
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mappings, unmarshalErr := UnmarshalRemoteStorageMappings(oldContent)
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if unmarshalErr != nil {
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return nil, unmarshalErr
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}
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// set the new mapping
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delete(mappings.Mappings, dir)
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if newContent, err = proto.Marshal(mappings); err != nil {
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return oldContent, fmt.Errorf("marshal mappings: %v", err)
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}
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return
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}
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