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volume.go
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volume.go
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// Copyright © 2019 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 volbuilder
import (
apis "github.com/openebs/zfs-localpv/pkg/apis/openebs.io/zfs/v1alpha1"
)
// ZFSVolume is a wrapper over
// ZFSVolume API instance
type ZFSVolume struct {
// ZFSVolume object
Object *apis.ZFSVolume
}
// From returns a new instance of
// zfs volume
func From(vol *apis.ZFSVolume) *ZFSVolume {
return &ZFSVolume{
Object: vol,
}
}
// Predicate defines an abstraction
// to determine conditional checks
// against the provided pod instance
type Predicate func(*ZFSVolume) bool
// PredicateList holds a list of predicate
type predicateList []Predicate
// ZFSVolumeList holds the list
// of zfs volume instances
type ZFSVolumeList struct {
// List conatils list of volumes
List apis.ZFSVolumeList
}
// Len returns the number of items present
// in the ZFSVolumeList
func (volList *ZFSVolumeList) Len() int {
return len(volList.List.Items)
}
// all returns true if all the predicates
// succeed against the provided ZFSVolume
// instance
func (l predicateList) all(vol *ZFSVolume) bool {
for _, pred := range l {
if !pred(vol) {
return false
}
}
return true
}
// HasLabels returns true if provided labels
// are present in the provided ZFSVolume instance
func HasLabels(keyValuePair map[string]string) Predicate {
return func(vol *ZFSVolume) bool {
for key, value := range keyValuePair {
if !vol.HasLabel(key, value) {
return false
}
}
return true
}
}
// HasLabel returns true if provided label
// is present in the provided ZFSVolume instance
func (vol *ZFSVolume) HasLabel(key, value string) bool {
val, ok := vol.Object.GetLabels()[key]
if ok {
return val == value
}
return false
}
// HasLabel returns true if provided label
// is present in the provided ZFSVolume instance
func HasLabel(key, value string) Predicate {
return func(vol *ZFSVolume) bool {
return vol.HasLabel(key, value)
}
}
// IsNil returns true if the zfs volume instance
// is nil
func (vol *ZFSVolume) IsNil() bool {
return vol.Object == nil
}
// IsNil is predicate to filter out nil zfs volume
// instances
func IsNil() Predicate {
return func(vol *ZFSVolume) bool {
return vol.IsNil()
}
}
// GetAPIObject returns zfs volume's API instance
func (vol *ZFSVolume) GetAPIObject() *apis.ZFSVolume {
return vol.Object
}