/
backupsession.go
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/
backupsession.go
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/*
Copyright The Stash 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 util
import (
"fmt"
api_v1beta1 "stash.appscode.dev/apimachinery/apis/stash/v1beta1"
cs "stash.appscode.dev/apimachinery/client/clientset/versioned/typed/stash/v1beta1"
jsonpatch "github.com/evanphx/json-patch"
"github.com/golang/glog"
kerr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
kutil "kmodules.xyz/client-go"
)
func CreateOrPatchBackupSession(c cs.StashV1beta1Interface, meta metav1.ObjectMeta, transform func(bs *api_v1beta1.BackupSession) *api_v1beta1.BackupSession) (*api_v1beta1.BackupSession, kutil.VerbType, error) {
cur, err := c.BackupSessions(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(err) {
glog.V(3).Infof("Creating BackupSession %s/%s.", meta.Namespace, meta.Name)
out, err := c.BackupSessions(meta.Namespace).Create(transform(&api_v1beta1.BackupSession{
TypeMeta: metav1.TypeMeta{
Kind: api_v1beta1.ResourceKindBackupSession,
APIVersion: api_v1beta1.SchemeGroupVersion.String(),
},
ObjectMeta: meta,
}))
return out, kutil.VerbCreated, err
} else if err != nil {
return nil, kutil.VerbUnchanged, err
}
return PatchBackupSession(c, cur, transform)
}
func PatchBackupSession(c cs.StashV1beta1Interface, cur *api_v1beta1.BackupSession, transform func(*api_v1beta1.BackupSession) *api_v1beta1.BackupSession) (*api_v1beta1.BackupSession, kutil.VerbType, error) {
return PatchBackupSessionObject(c, cur, transform(cur.DeepCopy()))
}
func PatchBackupSessionObject(c cs.StashV1beta1Interface, cur, mod *api_v1beta1.BackupSession) (*api_v1beta1.BackupSession, kutil.VerbType, error) {
curJson, err := json.Marshal(cur)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
modJson, err := json.Marshal(mod)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
patch, err := jsonpatch.CreateMergePatch(curJson, modJson)
if err != nil {
return nil, kutil.VerbUnchanged, err
}
if len(patch) == 0 || string(patch) == "{}" {
return cur, kutil.VerbUnchanged, nil
}
glog.V(3).Infof("Patching BackupSession %s/%s with %s.", cur.Namespace, cur.Name, string(patch))
out, err := c.BackupSessions(cur.Namespace).Patch(cur.Name, types.MergePatchType, patch)
return out, kutil.VerbPatched, err
}
func TryUpdateBackupSession(c cs.StashV1beta1Interface, meta metav1.ObjectMeta, transform func(*api_v1beta1.BackupSession) *api_v1beta1.BackupSession) (result *api_v1beta1.BackupSession, err error) {
attempt := 0
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
cur, e2 := c.BackupSessions(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if kerr.IsNotFound(e2) {
return false, e2
} else if e2 == nil {
result, e2 = c.BackupSessions(cur.Namespace).Update(transform(cur.DeepCopy()))
return e2 == nil, nil
}
glog.Errorf("Attempt %d failed to update BackupSession %s/%s due to %v.", attempt, cur.Namespace, cur.Name, e2)
return false, nil
})
if err != nil {
err = fmt.Errorf("failed to update BackupSession %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}
func UpdateBackupSessionStatusForHost(c cs.StashV1beta1Interface, targetRef api_v1beta1.TargetRef, backupSession *api_v1beta1.BackupSession, hostStats api_v1beta1.HostBackupStats) (*api_v1beta1.BackupSession, error) {
out, err := UpdateBackupSessionStatus(c, backupSession.ObjectMeta, func(in *api_v1beta1.BackupSessionStatus) *api_v1beta1.BackupSessionStatus {
targetIdx, hostIdx, targets := UpsertHostForTarget(backupSession.Status.Targets, targetRef, hostStats)
in.Targets = targets
if int32(len(targets[targetIdx].Stats)) != *targets[targetIdx].TotalHosts {
in.Targets[targetIdx].Phase = api_v1beta1.TargetBackupRunning
return in
}
if targets[targetIdx].Stats[hostIdx].Phase == api_v1beta1.HostBackupFailed {
in.Targets[targetIdx].Phase = api_v1beta1.TargetBackupFailed
return in
}
in.Targets[targetIdx].Phase = api_v1beta1.TargetBackupSucceeded
return in
})
return out, err
}
func UpsertHostForTarget(targets []api_v1beta1.Target, targetRef api_v1beta1.TargetRef, stat api_v1beta1.HostBackupStats) (int, int, []api_v1beta1.Target) {
var targetIdx, hostIdx int
for i, target := range targets {
if target.Ref.Name == targetRef.Name && target.Ref.Kind == targetRef.Kind {
targets[i].Stats = UpsertHost(target.Stats, stat)
for j, stat := range target.Stats {
if stat.Hostname == stat.Hostname {
hostIdx = j
}
}
targetIdx = i
}
}
return targetIdx, hostIdx, targets
}
func UpsertHost(stats []api_v1beta1.HostBackupStats, stat ...api_v1beta1.HostBackupStats) []api_v1beta1.HostBackupStats {
upsert := func(s api_v1beta1.HostBackupStats) {
for i, st := range stats {
if st.Hostname == s.Hostname {
stats[i] = s
return
}
}
stats = append(stats, s)
}
for _, s := range stat {
upsert(s)
}
return stats
}
func UpdateBackupSessionStatus(
c cs.StashV1beta1Interface,
meta metav1.ObjectMeta,
transform func(*api_v1beta1.BackupSessionStatus) *api_v1beta1.BackupSessionStatus,
) (result *api_v1beta1.BackupSession, err error) {
apply := func(x *api_v1beta1.BackupSession) *api_v1beta1.BackupSession {
out := &api_v1beta1.BackupSession{
TypeMeta: x.TypeMeta,
ObjectMeta: x.ObjectMeta,
Spec: x.Spec,
Status: *transform(x.Status.DeepCopy()),
}
return out
}
attempt := 0
cur, err := c.BackupSessions(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
err = wait.PollImmediate(kutil.RetryInterval, kutil.RetryTimeout, func() (bool, error) {
attempt++
var e2 error
result, e2 = c.BackupSessions(meta.Namespace).UpdateStatus(apply(cur))
if kerr.IsConflict(e2) {
latest, e3 := c.BackupSessions(meta.Namespace).Get(meta.Name, metav1.GetOptions{})
switch {
case e3 == nil:
cur = latest
return false, nil
case kutil.IsRequestRetryable(e3):
return false, nil
default:
return false, e3
}
} else if err != nil && !kutil.IsRequestRetryable(e2) {
return false, e2
}
return e2 == nil, nil
})
if err != nil {
err = fmt.Errorf("failed to update status of BackupSession %s/%s after %d attempts due to %v", meta.Namespace, meta.Name, attempt, err)
}
return
}