package shell import ( "context" "flag" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/pb/remote_pb" "github.com/chrislusf/seaweedfs/weed/remote_storage" "github.com/chrislusf/seaweedfs/weed/util" "github.com/golang/protobuf/jsonpb" "github.com/golang/protobuf/proto" "io" "strings" ) func init() { Commands = append(Commands, &commandRemoteMount{}) } type commandRemoteMount struct { } func (c *commandRemoteMount) Name() string { return "remote.mount" } func (c *commandRemoteMount) Help() string { return `mount remote storage and pull its metadata # assume a remote storage is configured to name "cloud1" remote.configure -name=cloud1 -type=s3 -access_key=xxx -secret_key=yyy # mount and pull one bucket remote.mount -dir=/xxx -remote=cloud1/bucket # mount and pull one directory in the bucket remote.mount -dir=/xxx -remote=cloud1/bucket/dir1 # after mount, start a separate process to write updates to remote storage weed filer.remote.sync -filer=: -dir=/xxx ` } func (c *commandRemoteMount) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) { remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) dir := remoteMountCommand.String("dir", "", "a directory in filer") nonEmpty := remoteMountCommand.Bool("nonempty", false, "allows the mounting over a non-empty directory") remote := remoteMountCommand.String("remote", "", "a directory in remote storage, ex. //path/to/dir") if err = remoteMountCommand.Parse(args); err != nil { return nil } if *dir == "" { _, err = listExistingRemoteStorageMounts(commandEnv, writer) return err } remoteStorageLocation := remote_storage.ParseLocation(*remote) // find configuration for remote storage // remotePath is //path/to/dir remoteConf, err := c.findRemoteStorageConfiguration(commandEnv, writer, remoteStorageLocation) if err != nil { return fmt.Errorf("find configuration for %s: %v", *remote, err) } // sync metadata from remote if err = c.syncMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remoteStorageLocation); err != nil { return fmt.Errorf("pull metadata: %v", err) } // store a mount configuration in filer if err = c.saveMountMapping(commandEnv, writer, *dir, remoteStorageLocation); err != nil { return fmt.Errorf("save mount mapping: %v", err) } return nil } func listExistingRemoteStorageMounts(commandEnv *CommandEnv, writer io.Writer) (mappings *remote_pb.RemoteStorageMapping, err error) { // read current mapping mappings, err = filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress) if err != nil { return mappings, err } jsonPrintln(writer, mappings) return } func jsonPrintln(writer io.Writer, message proto.Message) error { if message == nil { return nil } m := jsonpb.Marshaler{ EmitDefaults: false, Indent: " ", } err := m.Marshal(writer, message) fmt.Fprintln(writer) return err } func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote *remote_pb.RemoteStorageLocation) (conf *remote_pb.RemoteConf, err error) { return filer.ReadRemoteStorageConf(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, remote.Name) } func (c *commandRemoteMount) syncMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *remote_pb.RemoteConf, remote *remote_pb.RemoteStorageLocation) error { // find existing directory, and ensure the directory is empty err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { parent, name := util.FullPath(dir).DirAndName() _, lookupErr := client.LookupDirectoryEntry(context.Background(), &filer_pb.LookupDirectoryEntryRequest{ Directory: parent, Name: name, }) if lookupErr != nil { if !strings.Contains(lookupErr.Error(), filer_pb.ErrNotFound.Error()) { return fmt.Errorf("lookup %s: %v", dir, lookupErr) } } mountToDirIsEmpty := true listErr := filer_pb.SeaweedList(client, dir, "", func(entry *filer_pb.Entry, isLast bool) error { mountToDirIsEmpty = false return nil }, "", false, 1) if listErr != nil { return fmt.Errorf("list %s: %v", dir, listErr) } if !mountToDirIsEmpty { if !nonEmpty { return fmt.Errorf("dir %s is not empty", dir) } } return nil }) if err != nil { return err } // pull metadata from remote if err = pullMetadata(commandEnv, writer, util.FullPath(dir), remote, util.FullPath(dir), remoteConf); err != nil { return fmt.Errorf("cache content data: %v", err) } return nil } func (c *commandRemoteMount) saveMountMapping(commandEnv *CommandEnv, writer io.Writer, dir string, remoteStorageLocation *remote_pb.RemoteStorageLocation) (err error) { // read current mapping var oldContent, newContent []byte err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { oldContent, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE) return err }) if err != nil { if err != filer_pb.ErrNotFound { return fmt.Errorf("read existing mapping: %v", err) } } // add new mapping newContent, err = filer.AddRemoteStorageMapping(oldContent, dir, remoteStorageLocation) if err != nil { return fmt.Errorf("add mapping %s~%s: %v", dir, remoteStorageLocation, err) } // save back err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { return filer.SaveInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE, newContent) }) if err != nil { return fmt.Errorf("save mapping: %v", err) } return nil } // if an entry has synchronized metadata but has not synchronized content // entry.Attributes.FileSize == entry.RemoteEntry.RemoteSize // entry.Attributes.Mtime == entry.RemoteEntry.RemoteMtime // entry.RemoteEntry.LastLocalSyncTsNs == 0 // if an entry has synchronized metadata but has synchronized content before // entry.Attributes.FileSize == entry.RemoteEntry.RemoteSize // entry.Attributes.Mtime == entry.RemoteEntry.RemoteMtime // entry.RemoteEntry.LastLocalSyncTsNs > 0 // if an entry has synchronized metadata but has new updates // entry.Attributes.Mtime * 1,000,000,000 > entry.RemoteEntry.LastLocalSyncTsNs func doSaveRemoteEntry(client filer_pb.SeaweedFilerClient, localDir string, existingEntry *filer_pb.Entry, remoteEntry *filer_pb.RemoteEntry) error { existingEntry.RemoteEntry = remoteEntry existingEntry.Attributes.FileSize = uint64(remoteEntry.RemoteSize) existingEntry.Attributes.Mtime = remoteEntry.RemoteMtime _, updateErr := client.UpdateEntry(context.Background(), &filer_pb.UpdateEntryRequest{ Directory: localDir, Entry: existingEntry, }) if updateErr != nil { return updateErr } return nil }