113 lines
4.2 KiB
Go
113 lines
4.2 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"context"
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"fmt"
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"strings"
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"time"
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"github.com/container-storage-interface/spec/lib/go/csi/v0"
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crdv1 "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1alpha1"
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"github.com/kubernetes-csi/external-snapshotter/pkg/connection"
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"k8s.io/api/core/v1"
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)
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// Handler is responsible for handling VolumeSnapshot events from informer.
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type Handler interface {
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CreateSnapshot(snapshot *crdv1.VolumeSnapshot, volume *v1.PersistentVolume, parameters map[string]string, snapshotterCredentials map[string]string) (string, string, int64, int64, *csi.SnapshotStatus, error)
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DeleteSnapshot(content *crdv1.VolumeSnapshotContent, snapshotterCredentials map[string]string) error
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GetSnapshotStatus(content *crdv1.VolumeSnapshotContent) (*csi.SnapshotStatus, int64, error)
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}
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// csiHandler is a handler that calls CSI to create/delete volume snapshot.
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type csiHandler struct {
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csiConnection connection.CSIConnection
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timeout time.Duration
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snapshotNamePrefix string
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snapshotNameUUIDLength int
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}
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func NewCSIHandler(
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csiConnection connection.CSIConnection,
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timeout time.Duration,
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snapshotNamePrefix string,
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snapshotNameUUIDLength int,
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) Handler {
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return &csiHandler{
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csiConnection: csiConnection,
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timeout: timeout,
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snapshotNamePrefix: snapshotNamePrefix,
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snapshotNameUUIDLength: snapshotNameUUIDLength,
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}
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}
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func (handler *csiHandler) CreateSnapshot(snapshot *crdv1.VolumeSnapshot, volume *v1.PersistentVolume, parameters map[string]string, snapshotterCredentials map[string]string) (string, string, int64, int64, *csi.SnapshotStatus, error) {
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ctx, cancel := context.WithTimeout(context.Background(), handler.timeout)
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defer cancel()
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snapshotName, err := makeSnapshotName(handler.snapshotNamePrefix, string(snapshot.UID), handler.snapshotNameUUIDLength)
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if err != nil {
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return "", "", 0, 0, nil, err
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}
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return handler.csiConnection.CreateSnapshot(ctx, snapshotName, volume, parameters, snapshotterCredentials)
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}
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func (handler *csiHandler) DeleteSnapshot(content *crdv1.VolumeSnapshotContent, snapshotterCredentials map[string]string) error {
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if content.Spec.CSI == nil {
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return fmt.Errorf("CSISnapshot not defined in spec")
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}
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ctx, cancel := context.WithTimeout(context.Background(), handler.timeout)
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defer cancel()
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err := handler.csiConnection.DeleteSnapshot(ctx, content.Spec.CSI.SnapshotHandle, snapshotterCredentials)
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if err != nil {
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return fmt.Errorf("failed to delete snapshot data %s: %q", content.Name, err)
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}
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return nil
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}
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func (handler *csiHandler) GetSnapshotStatus(content *crdv1.VolumeSnapshotContent) (*csi.SnapshotStatus, int64, error) {
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if content.Spec.CSI == nil {
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return nil, 0, fmt.Errorf("CSISnapshot not defined in spec")
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}
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ctx, cancel := context.WithTimeout(context.Background(), handler.timeout)
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defer cancel()
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csiSnapshotStatus, timestamp, err := handler.csiConnection.GetSnapshotStatus(ctx, content.Spec.CSI.SnapshotHandle)
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if err != nil {
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return nil, 0, fmt.Errorf("failed to list snapshot data %s: %q", content.Name, err)
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}
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return csiSnapshotStatus, timestamp, nil
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}
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func makeSnapshotName(prefix, snapshotUID string, snapshotNameUUIDLength int) (string, error) {
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// create persistent name based on a volumeNamePrefix and volumeNameUUIDLength
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// of PVC's UID
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if len(snapshotUID) == 0 {
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return "", fmt.Errorf("Corrupted snapshot object, it is missing UID")
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}
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if snapshotNameUUIDLength == -1 {
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// Default behavior is to not truncate or remove dashes
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return fmt.Sprintf("%s-%s", prefix, snapshotUID), nil
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}
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return fmt.Sprintf("%s-%s", prefix, strings.Replace(snapshotUID, "-", "", -1)[0:snapshotNameUUIDLength]), nil
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}
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