seaweedfs/weed/shell/command_remote_unmount.go

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2021-08-09 05:26:37 +00:00
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"
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"github.com/chrislusf/seaweedfs/weed/util"
"io"
"time"
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)
func init() {
Commands = append(Commands, &commandRemoteUnmount{})
}
type commandRemoteUnmount struct {
}
func (c *commandRemoteUnmount) Name() string {
return "remote.unmount"
}
func (c *commandRemoteUnmount) Help() string {
return `unmount remote storage
# assume a remote storage is configured to name "s3_1"
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remote.configure -name=s3_1 -type=s3 -s3.access_key=xxx -s3.secret_key=yyy
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# mount and pull one bucket
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remote.mount -dir=/xxx -remote=s3_1/bucket
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# unmount the mounted directory and remove its cache
remote.unmount -dir=/xxx
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`
}
func (c *commandRemoteUnmount) 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")
if err = remoteMountCommand.Parse(args); err != nil {
return nil
}
mappings, listErr := filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress)
if listErr != nil {
return listErr
}
if *dir == "" {
return jsonPrintln(writer, mappings)
}
_, found := mappings.Mappings[*dir]
if !found {
return fmt.Errorf("directory %s is not mounted", *dir)
}
// store a mount configuration in filer
fmt.Fprintf(writer, "deleting mount for %s ...\n", *dir)
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if err = filer.DeleteMountMapping(commandEnv, *dir); err != nil {
return fmt.Errorf("delete mount mapping: %v", err)
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}
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// purge mounted data
fmt.Fprintf(writer, "purge %s ...\n", *dir)
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if err = c.purgeMountedData(commandEnv, *dir); err != nil {
return fmt.Errorf("purge mounted data: %v", err)
}
// reset remote sync offset in case the folder is mounted again
if err = remote_storage.SetSyncOffset(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress, *dir, time.Now().UnixNano()); err != nil {
return fmt.Errorf("reset remote.sync offset for %s: %v", *dir, err)
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}
return nil
}
func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir string) 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()
lookupResp, lookupErr := client.LookupDirectoryEntry(context.Background(), &filer_pb.LookupDirectoryEntryRequest{
Directory: parent,
Name: name,
})
if lookupErr != nil {
return fmt.Errorf("lookup %s: %v", dir, lookupErr)
}
oldEntry := lookupResp.Entry
deleteError := filer_pb.DoRemove(client, parent, name, true, true, true, false, nil)
if deleteError != nil {
return fmt.Errorf("delete %s: %v", dir, deleteError)
}
mkdirErr := filer_pb.DoMkdir(client, parent, name, func(entry *filer_pb.Entry) {
entry.Attributes = oldEntry.Attributes
entry.Extended = oldEntry.Extended
entry.Attributes.Crtime = time.Now().Unix()
entry.Attributes.Mtime = time.Now().Unix()
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})
if mkdirErr != nil {
return fmt.Errorf("mkdir %s: %v", dir, mkdirErr)
}
return nil
})
if err != nil {
return err
}
return nil
}