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