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upgrade.go
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upgrade.go
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package actor
import (
"context"
"encoding/csv"
"fmt"
"github.com/Masterminds/semver/v3"
api "github.com/cockroachdb/cockroach-operator/api/v1alpha1"
"github.com/cockroachdb/cockroach-operator/pkg/condition"
"github.com/cockroachdb/cockroach-operator/pkg/kube"
"github.com/cockroachdb/cockroach-operator/pkg/resource"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/runtime"
kubetypes "k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client"
"strings"
)
func newUpgrade(scheme *runtime.Scheme, cl client.Client, config *rest.Config) Actor {
return &upgrade{
action: newAction("upgrade", scheme, cl),
config: config,
}
}
type upgrade struct {
action
config *rest.Config
}
func (up *upgrade) Handles(conds []api.ClusterCondition) bool {
return condition.False(api.NotInitializedCondition, conds)
}
func (up *upgrade) Act(ctx context.Context, cluster *resource.Cluster) error {
log := up.log.WithValues("CrdbCluster", cluster.ObjectKey())
log.Info("checking upgrade opportunities")
stsName := cluster.StatefulSetName()
key := kubetypes.NamespacedName{
Namespace: cluster.Namespace(),
Name: stsName,
}
statefulSet := &appsv1.StatefulSet{}
if err := up.client.Get(ctx, key, statefulSet); err != nil {
return errors.Wrap(err, "failed to fetch statefulset")
}
if statefulSetIsUpdating(statefulSet) {
return NotReadyErr{Err: errors.New("statefulset is updating, waiting for the update to finish")}
}
dbContainer, err := kube.FindContainer(resource.DbContainerName, &statefulSet.Spec.Template.Spec)
if err != nil {
return err
}
// nothing to be done
if dbContainer.Image == cluster.Spec().Image {
log.Info("no version changes needed")
return nil
}
specStr := getVersionFromImage(cluster.Spec().Image)
if specStr == "" {
return fmt.Errorf("Unknown CockroachDB version in spec: %s", cluster.Spec().Image)
}
specVer, err := semver.NewVersion(specStr)
if err != nil {
return errors.Wrapf(err, "failed to parse spec image version: %s", specStr)
}
clusterStr, err := up.getClusterSetting(cluster, "version")
if err != nil {
return errors.Wrapf(err, "failed to fetch cluster version")
}
// Caret range comparison `^` to detect major change
// https://github.com/Masterminds/semver#caret-range-comparisons-major)
contraintStr := fmt.Sprintf("^%s", clusterStr)
constraint, err := semver.NewConstraint(contraintStr)
if err != nil {
return errors.Wrapf(err, "failed to initialize version contaraint: %s", contraintStr)
}
log.Info("detected versions", "spec", specVer.String(), "cluster", clusterStr)
// Major upgrade
if !constraint.Check(specVer) {
log.Info("preserving downgrade option")
if err := up.preserveDowngrade(cluster, clusterStr); err != nil {
return err
}
}
update := statefulSet.DeepCopy()
updatedContainer, _ := kube.FindContainer(resource.DbContainerName, &update.Spec.Template.Spec)
updatedContainer.Image = cluster.Spec().Image
if err := up.client.Update(ctx, update); err != nil {
return errors.Wrap(err, "failed to update image version")
}
log.Info("scheduled update", "new version", specStr)
CancelLoop(ctx)
return nil
}
func getVersionFromImage(image string) string {
i := strings.LastIndex(image, ":")
if i == -1 {
return ""
}
return image[i+1:]
}
func (up *upgrade) getClusterSetting(cluster *resource.Cluster, setting string) (string, error) {
rows, err := up.showClusterSetting(cluster, setting)
if err != nil {
return "", err
}
if len(rows) == 1 {
// we only have the header.
return "", nil
}
if len(rows) != 2 || len(rows[0]) != 1 || len(rows[1]) != 1 {
return "", fmt.Errorf("expected two rows with 1 column, got: %v", rows)
}
if rows[0][0] != setting {
return "", fmt.Errorf("expected column named \"%s\", got: %s", setting, rows[0][0])
}
return rows[1][0], nil
}
func (up *upgrade) showClusterSetting(cluster *resource.Cluster, setting string) ([][]string, error) {
cmd := []string{
"/bin/bash",
"-c",
"/cockroach/cockroach sql " + cluster.SecureMode() +
fmt.Sprintf(" -e 'SHOW CLUSTER SETTING %s' --format csv", setting),
}
stdout, stderr, err := kube.ExecInPod(up.scheme, up.config, cluster.Namespace(),
fmt.Sprintf("%s-0", cluster.StatefulSetName()), resource.DbContainerName, cmd)
if err != nil {
return nil, errors.Wrapf(err, "failed to fetch cluster setting %s: %s", setting, stderr)
}
return csv.NewReader(strings.NewReader(stdout)).ReadAll()
}
func statefulSetIsUpdating(ss *appsv1.StatefulSet) bool {
if ss.Status.ObservedGeneration == 0 {
return false
}
if ss.Status.CurrentRevision != ss.Status.UpdateRevision {
return true
}
if ss.Generation > ss.Status.ObservedGeneration && *ss.Spec.Replicas == ss.Status.Replicas {
return true
}
return false
}
func (up *upgrade) preserveDowngrade(cluster *resource.Cluster, clusterVer string) error {
cmd := []string{
"/bin/bash",
"-c",
"/cockroach/cockroach sql " + cluster.SecureMode() +
fmt.Sprintf(" -e \"SET CLUSTER SETTING cluster.preserve_downgrade_option = '%s'\"", clusterVer),
}
_, stderr, err := kube.ExecInPod(up.scheme, up.config, cluster.Namespace(),
fmt.Sprintf("%s-0", cluster.StatefulSetName()), resource.DbContainerName, cmd)
if err != nil {
return errors.Wrapf(err, "failed to update cluster.preserve_downgrade_option: %s", stderr)
}
return nil
}