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package driver
import (
"context"
"fmt"
"os"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/mount_pb"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"k8s.io/utils/mount"
)
type Volume struct {
VolumeId string
// volume's real mount point
stagingTargetPath string
// Target paths to which the volume has been published.
// These paths are symbolic links to the real mount point.
// So multiple pods using the same volume can share a mount.
targetPaths map[string]bool
mounter Mounter
// unix socket used to manage volume
localSocket string
}
func NewVolume(volumeID string, mounter Mounter) *Volume {
return &Volume{
VolumeId: volumeID,
mounter: mounter,
targetPaths: make(map[string]bool),
}
}
func (vol *Volume) Stage(stagingTargetPath string) error {
if vol.isStaged() {
return nil
}
// check whether it can be mounted
if notMnt, err := checkMount(stagingTargetPath); err != nil {
return err
} else if !notMnt {
// maybe already mounted?
return nil
}
if err := vol.mounter.Mount(stagingTargetPath); err != nil {
return err
}
vol.stagingTargetPath = stagingTargetPath
return nil
}
func (vol *Volume) Publish(targetPath string, readOnly bool) error {
// check whether it can be mounted
if notMnt, err := checkMount(targetPath); err != nil {
return err
} else if !notMnt {
// maybe already mounted?
return nil
}
// Use bind mount to create an alias of the real mount point.
mountOptions := []string{"bind"}
if readOnly {
mountOptions = append(mountOptions, "ro")
}
mounter := mount.New("")
if err := mounter.Mount(vol.stagingTargetPath, targetPath, "", mountOptions); err != nil {
return nil
}
vol.targetPaths[targetPath] = true
return nil
}
func (vol *Volume) Expand(sizeByte int64) error {
if !vol.isStaged() {
return nil
}
target := fmt.Sprintf("passthrough:///unix://%s", vol.getLocalSocket())
dialOption := grpc.WithTransportCredentials(insecure.NewCredentials())
clientConn, err := grpc.Dial(target, dialOption)
if err != nil {
return err
}
defer clientConn.Close()
client := mount_pb.NewSeaweedMountClient(clientConn)
_, err = client.Configure(context.Background(), &mount_pb.ConfigureRequest{
CollectionCapacity: sizeByte,
})
return err
}
func (vol *Volume) Unpublish(targetPath string) error {
// Check whether the volume is published to the target path.
if _, ok := vol.targetPaths[targetPath]; !ok {
glog.Warningf("volume %s hasn't been published to %s", vol.VolumeId, targetPath)
return nil
}
// Try unmounting target path and deleting it.
mounter := mount.New("")
if err := mount.CleanupMountPoint(targetPath, mounter, true); err != nil {
return err
}
delete(vol.targetPaths, targetPath)
return nil
}
func (vol *Volume) Unstage(_ string) error {
if !vol.isStaged() {
return nil
}
mountPoint := vol.stagingTargetPath
glog.V(0).Infof("unmounting volume %s from %s", vol.VolumeId, mountPoint)
if err := fuseUnmount(mountPoint); err != nil {
return err
}
if err := os.Remove(mountPoint); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (vol *Volume) isStaged() bool {
return vol.stagingTargetPath != ""
}
func (vol *Volume) getLocalSocket() string {
if vol.localSocket != "" {
return vol.localSocket
}
socket := GetLocalSocket(vol.VolumeId)
vol.localSocket = socket
return socket
}
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