You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: command_volume_vacuum.go
    path of file: ./repos/seaweedfs/weed/shell
    
    the code of the file until where you have to start completion: package shell

import (
	"context"
	"flag"
	"io"

	"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
)

func init() {
	Commands = append(Commands, &commandVacuum{})
}

type commandVacuum struct {
}

func (c *commandVacuum) Name() string {
	return "volume.vacuum"
}

func (c *commandVacuum) Help() string {
	return `compact volumes if deleted entries are more than the limit

	volume.vacuum [-garbageThreshold=0.3] [-collection=<collection name>] [-volumeId=<volume id>]

`
}

func (c *commandVacuum) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {

	volumeVacuumCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
	garbageThreshold := volumeVacuumCommand.Float64("garbageThreshold", 0.3, "vacuum when garbage is more than this limit")
	collection := volumeVacuumCommand.String("collection", "", "vacuum this collection")
	volumeId := volumeVacuumCommand.Uint("volumeId", 0, "the volume id")
	if err = volume
    
func (c *commandVacuum) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {

	volumeVacuumCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
	garbageThreshold := volumeVacuumCommand.Float64("garbageThreshold", 0.3, "vacuum when garbage is more than this limit")
	collection := volumeVacuumCommand.String("collection", "", "vacuum this collection")
	volumeId := volumeVacuumCommand.Uint("volumeId", 0, "the volume id")
	if err = volumeVacuumCommand.Parse(args); err != nil {
		return nil
	}

	if err = commandEnv.confirmIsLocked(args); err != nil {
		return
	}

	err = commandEnv.MasterClient.WithClient(false, func(client master_pb.SeaweedClient) error {
		_, err = client.VacuumVolume(context.Background(), &master_pb.VacuumVolumeRequest{
			GarbageThreshold: float32(*garbageThreshold),
			VolumeId:         uint32(*volumeId),
			Collection:       *collection,
		})
		return err
	})
	if err != nil {
		return
	}

	return nil
}