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volumes.go
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volumes.go
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package store
import (
"strings"
memdb "github.com/hashicorp/go-memdb"
"github.com/moby/swarmkit/v2/api"
)
const tableVolume = "volume"
func init() {
register(ObjectStoreConfig{
Table: &memdb.TableSchema{
Name: tableVolume,
Indexes: map[string]*memdb.IndexSchema{
indexID: {
Name: indexID,
Unique: true,
Indexer: api.VolumeIndexerByID{},
},
indexName: {
Name: indexName,
Unique: true,
Indexer: api.VolumeIndexerByName{},
},
indexCustom: {
Name: indexCustom,
Indexer: api.VolumeCustomIndexer{},
AllowMissing: true,
},
indexVolumeGroup: {
Name: indexVolumeGroup,
Indexer: volumeIndexerByGroup{},
},
indexDriver: {
Name: indexDriver,
Indexer: volumeIndexerByDriver{},
},
},
},
Save: func(tx ReadTx, snapshot *api.StoreSnapshot) error {
var err error
snapshot.Volumes, err = FindVolumes(tx, All)
return err
},
Restore: func(tx Tx, snapshot *api.StoreSnapshot) error {
toStoreObj := make([]api.StoreObject, len(snapshot.Volumes))
for i, x := range snapshot.Volumes {
toStoreObj[i] = x
}
return RestoreTable(tx, tableVolume, toStoreObj)
},
ApplyStoreAction: func(tx Tx, sa api.StoreAction) error {
switch v := sa.Target.(type) {
case *api.StoreAction_Volume:
obj := v.Volume
switch sa.Action {
case api.StoreActionKindCreate:
return CreateVolume(tx, obj)
case api.StoreActionKindUpdate:
return UpdateVolume(tx, obj)
case api.StoreActionKindRemove:
return DeleteVolume(tx, obj.ID)
}
}
return errUnknownStoreAction
},
})
}
func CreateVolume(tx Tx, v *api.Volume) error {
if tx.lookup(tableVolume, indexName, strings.ToLower(v.Spec.Annotations.Name)) != nil {
return ErrNameConflict
}
return tx.create(tableVolume, v)
}
func UpdateVolume(tx Tx, v *api.Volume) error {
// ensure the name is either not in use, or is in use by this volume.
if existing := tx.lookup(tableVolume, indexName, strings.ToLower(v.Spec.Annotations.Name)); existing != nil {
if existing.GetID() != v.ID {
return ErrNameConflict
}
}
return tx.update(tableVolume, v)
}
func DeleteVolume(tx Tx, id string) error {
return tx.delete(tableVolume, id)
}
func GetVolume(tx ReadTx, id string) *api.Volume {
n := tx.get(tableVolume, id)
if n == nil {
return nil
}
return n.(*api.Volume)
}
func FindVolumes(tx ReadTx, by By) ([]*api.Volume, error) {
checkType := func(by By) error {
switch by.(type) {
case byName, byNamePrefix, byIDPrefix, byVolumeGroup, byCustom, byCustomPrefix, byDriver:
return nil
default:
return ErrInvalidFindBy
}
}
volumeList := []*api.Volume{}
appendResult := func(o api.StoreObject) {
volumeList = append(volumeList, o.(*api.Volume))
}
err := tx.find(tableVolume, by, checkType, appendResult)
return volumeList, err
}
type volumeIndexerByGroup struct{}
func (vi volumeIndexerByGroup) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (vi volumeIndexerByGroup) FromObject(obj interface{}) (bool, []byte, error) {
v := obj.(*api.Volume)
val := v.Spec.Group + "\x00"
return true, []byte(val), nil
}
type volumeIndexerByDriver struct{}
func (vi volumeIndexerByDriver) FromArgs(args ...interface{}) ([]byte, error) {
return fromArgs(args...)
}
func (vi volumeIndexerByDriver) FromObject(obj interface{}) (bool, []byte, error) {
v := obj.(*api.Volume)
// this should never happen -- existence of the volume driver is checked
// at the controlapi level. However, guard against the unforeseen.
if v.Spec.Driver == nil {
return false, nil, nil
}
val := v.Spec.Driver.Name + "\x00"
return true, []byte(val), nil
}