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snapshot.go
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snapshot.go
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// Copyright © 2020 The OpenEBS Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package snapbuilder
import (
apis "github.com/openebs/zfs-localpv/pkg/apis/openebs.io/zfs/v1alpha1"
)
// ZFSSnapshot is a wrapper over
// ZFSSnapshot API instance
type ZFSSnapshot struct {
// ZFSSnap object
Object *apis.ZFSSnapshot
}
// From returns a new instance of
// zfssnap volume
func From(snap *apis.ZFSSnapshot) *ZFSSnapshot {
return &ZFSSnapshot{
Object: snap,
}
}
// Predicate defines an abstraction
// to determine conditional checks
// against the provided pod instance
type Predicate func(*ZFSSnapshot) bool
// PredicateList holds a list of predicate
type predicateList []Predicate
// ZFSSnapshotList holds the list
// of zfs snapshot instances
type ZFSSnapshotList struct {
// List contains list of snapshots
List apis.ZFSSnapshotList
}
// Len returns the number of items present
// in the ZFSSnapshotList
func (snapList *ZFSSnapshotList) Len() int {
return len(snapList.List.Items)
}
// all returns true if all the predicates
// succeed against the provided ZFSSnapshot
// instance
func (l predicateList) all(snap *ZFSSnapshot) bool {
for _, pred := range l {
if !pred(snap) {
return false
}
}
return true
}
// HasLabels returns true if provided labels
// are present in the provided ZFSSnapshot instance
func HasLabels(keyValuePair map[string]string) Predicate {
return func(snap *ZFSSnapshot) bool {
for key, value := range keyValuePair {
if !snap.HasLabel(key, value) {
return false
}
}
return true
}
}
// HasLabel returns true if provided label
// is present in the provided ZFSSnapshot instance
func (snap *ZFSSnapshot) HasLabel(key, value string) bool {
val, ok := snap.Object.GetLabels()[key]
if ok {
return val == value
}
return false
}
// HasLabel returns true if provided label
// is present in the provided ZFSSnapshot instance
func HasLabel(key, value string) Predicate {
return func(snap *ZFSSnapshot) bool {
return snap.HasLabel(key, value)
}
}
// IsNil returns true if the zfssnap volume instance
// is nil
func (snap *ZFSSnapshot) IsNil() bool {
return snap.Object == nil
}
// IsNil is predicate to filter out nil zfssnap volume
// instances
func IsNil() Predicate {
return func(snap *ZFSSnapshot) bool {
return snap.IsNil()
}
}
// GetAPIObject returns zfssnap volume's API instance
func (snap *ZFSSnapshot) GetAPIObject() *apis.ZFSSnapshot {
return snap.Object
}