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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/remote_storage"
"github.com/chrislusf/seaweedfs/weed/util"
"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 "s3_1"
remote.configure -name=s3_1 -type=s3 -access_key=xxx -secret_key=yyy
# mount and pull one bucket
remote.mount -dir=xxx -remote=s3_1/bucket
# mount and pull one directory in the bucket
remote.mount -dir=xxx -remote=s3_1/bucket/dir1
`
}
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. <storageName>/<bucket>/path/to/dir")
if err = remoteMountCommand.Parse(args); err != nil {
return nil
}
// find configuration for remote storage
remoteConf, remotePath, err := c.findRemoteStorageConfiguration(commandEnv, writer, *remote)
if err != nil {
return fmt.Errorf("find configuration for %s: %v", *remote, err)
}
// pull metadata from remote
if err = c.pullMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remotePath); err != nil {
return fmt.Errorf("pull metadata: %v", err)
}
// store a mount configuration in filer
return nil
}
func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote string) (conf *filer_pb.RemoteConf, remotePath string, err error) {
// find remote configuration
parts := strings.Split(remote, "/")
if len(parts) == 0 {
err = fmt.Errorf("wrong remote storage location %s", remote)
return
}
storageName := parts[0]
remotePath = remote[len(storageName):]
// read storage configuration data
var confBytes []byte
err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
confBytes, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, storageName+filer.REMOTE_STORAGE_CONF_SUFFIX)
return err
})
if err != nil {
err = fmt.Errorf("no remote storage configuration for %s : %v", storageName, err)
return
}
// unmarshal storage configuration
conf = &filer_pb.RemoteConf{}
if unMarshalErr := proto.Unmarshal(confBytes, conf); unMarshalErr != nil {
err = fmt.Errorf("unmarshal %s/%s: %v", filer.DirectoryEtcRemote, storageName, unMarshalErr)
return
}
return
}
func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *filer_pb.RemoteConf, remotePath string) error {
// find existing directory, and ensure the directory is empty
var mountToDir *filer_pb.Entry
err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
parent, name := util.FullPath(dir).DirAndName()
resp, lookupErr := client.LookupDirectoryEntry(context.Background(), &filer_pb.LookupDirectoryEntryRequest{
Directory: parent,
Name: name,
})
if lookupErr != nil {
return fmt.Errorf("lookup %s: %v", dir, lookupErr)
}
mountToDir = resp.Entry
mountToDirIsEmpty := false
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
}
// visit remote storage
remoteStorage, err := remote_storage.GetRemoteStorage(remoteConf)
if err != nil {
return err
}
err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
ctx := context.Background()
err = remoteStorage.Traverse(remotePath, func(remoteDir, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error {
localDir := dir + remoteDir
println(util.NewFullPath(localDir, name))
lookupResponse, lookupErr := filer_pb.LookupEntry(client, &filer_pb.LookupDirectoryEntryRequest{
Directory: localDir,
Name: name,
})
if lookupErr != nil {
if lookupErr != filer_pb.ErrNotFound {
return lookupErr
}
}
existingEntry := lookupResponse.Entry
if existingEntry == nil {
_, createErr := client.CreateEntry(ctx, &filer_pb.CreateEntryRequest{
Directory: localDir,
Entry: &filer_pb.Entry{
Name: name,
IsDirectory: isDirectory,
Attributes: &filer_pb.FuseAttributes{
FileSize: uint64(remoteEntry.Size),
Mtime: remoteEntry.LastModifiedAt,
FileMode: uint32(0644),
},
RemoteEntry: remoteEntry,
},
})
return createErr
} else {
if existingEntry.RemoteEntry.ETag != remoteEntry.ETag {
existingEntry.RemoteEntry = remoteEntry
existingEntry.Attributes.FileSize = uint64(remoteEntry.Size)
existingEntry.Attributes.Mtime = remoteEntry.LastModifiedAt
_, updateErr := client.UpdateEntry(ctx, &filer_pb.UpdateEntryRequest{
Directory: localDir,
Entry: existingEntry,
})
return updateErr
}
}
return nil
})
return err
})
if err != nil {
return err
}
return nil
}
|
