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update.go
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update.go
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package install
import (
"context"
"encoding/json"
"fmt"
"time"
stacksscheme "github.com/docker/compose-on-kubernetes/api/client/clientset/scheme"
stacksclient "github.com/docker/compose-on-kubernetes/api/client/clientset/typed/compose/v1beta1"
stacks "github.com/docker/compose-on-kubernetes/api/compose/v1beta1"
"github.com/docker/compose-on-kubernetes/api/constants"
"github.com/docker/compose-on-kubernetes/internal/conversions"
"github.com/docker/compose-on-kubernetes/internal/internalversion"
"github.com/docker/compose-on-kubernetes/internal/parsing"
"github.com/docker/compose-on-kubernetes/internal/registry"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
apiextensions "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apiextensionsclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/client-go/kubernetes"
appsv1beta2 "k8s.io/client-go/kubernetes/typed/apps/v1beta2"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
)
const (
// BackupPreviousErase erases previous backup
BackupPreviousErase = iota
// BackupPreviousMerge adds/merges new data to previous backup
BackupPreviousMerge
// BackupPreviousFail fails if a previous backup exists
BackupPreviousFail
backupAPIGroup = "composebackup.docker.com"
userAnnotationKey = "com.docker.compose.user"
)
func createBackupCrd(crds apiextensionsclient.CustomResourceDefinitionInterface) error {
log.Info("Creating backup CRD")
_, err := crds.Create(&apiextensions.CustomResourceDefinition{
ObjectMeta: v1.ObjectMeta{
Name: "stackbackups." + backupAPIGroup,
},
Spec: apiextensions.CustomResourceDefinitionSpec{
Group: backupAPIGroup,
Version: "v1beta1",
Names: apiextensions.CustomResourceDefinitionNames{
Plural: "stackbackups",
Singular: "stackbackup",
Kind: "StackBackup",
ListKind: "StackBackupList",
},
Scope: apiextensions.NamespaceScoped,
},
})
return err
}
func copyStacksToBackupCrd(source stacks.StackList, kubeClient kubernetes.Interface) error {
for _, stack := range source.Items {
stack.APIVersion = fmt.Sprintf("%s/v1beta1", backupAPIGroup)
stack.ResourceVersion = ""
stack.Kind = "StackBackup"
jstack, err := json.Marshal(stack)
if err != nil {
return errors.Wrap(err, "failed to marshal stack to JSON")
}
res := kubeClient.CoreV1().RESTClient().Verb("POST").
RequestURI(fmt.Sprintf("/apis/%s/v1beta1/namespaces/%s/stackbackups", backupAPIGroup, stack.Namespace)).
Body(jstack).Do()
if res.Error() != nil {
if apierrors.IsAlreadyExists(res.Error()) {
// stack already exists, try updating it
updateRes := kubeClient.CoreV1().RESTClient().Verb("PUT").
RequestURI(fmt.Sprintf("/apis/%s/v1beta1/namespaces/%s/stackbackups", backupAPIGroup, stack.Namespace)).
Body(jstack).Do()
if updateRes.Error() == nil {
continue
} else {
return errors.Wrap(updateRes.Error(), fmt.Sprintf("failed to write then update stack %s/%s", stack.Namespace, stack.Name))
}
}
return errors.Wrap(res.Error(), fmt.Sprintf("failed to write stack %s/%s", stack.Namespace, stack.Name))
}
}
return nil
}
// Backup saves all stacks to a new temporary CRD
func Backup(config *rest.Config, mode int) error {
log.Info("Starting backup process")
extClient, err := apiextensionsclient.NewForConfig(config)
if err != nil {
return err
}
crds := extClient.CustomResourceDefinitions()
_, err = crds.Get("stackbackups."+backupAPIGroup, v1.GetOptions{})
needsCreate := err != nil
if err == nil {
switch mode {
case BackupPreviousFail:
return errors.New("a previous backup already exists")
case BackupPreviousErase:
log.Info("Erasing previous backup")
err = crds.Delete("stackbackups."+backupAPIGroup, &v1.DeleteOptions{})
if err != nil {
return err
}
for i := 0; i < 60; i++ {
_, err = crds.Get("stackbackups."+backupAPIGroup, v1.GetOptions{})
if err != nil {
break
}
time.Sleep(1 * time.Second)
}
needsCreate = true
case BackupPreviousMerge:
log.Info("Merging with previous backup")
}
}
if needsCreate {
if err := createBackupCrd(crds); err != nil {
return err
}
}
log.Info("Copying stacks to backup CRD")
// The stacks client will work both with apiserver and crd backed resource
kubeClient, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
var source stacks.StackList
listOpts := metav1.ListOptions{}
for {
err = kubeClient.CoreV1().RESTClient().Verb("GET").
RequestURI("/apis/compose.docker.com/v1beta1/stacks").
VersionedParams(&listOpts, stacksscheme.ParameterCodec).
Do().
Into(&source)
if err != nil {
return err
}
if err = copyStacksToBackupCrd(source, kubeClient); err != nil {
return err
}
if source.Continue == "" {
break
}
listOpts.Continue = source.Continue
}
return nil
}
// Restore copies stacks from backup to v1beta1 stacks.compose.docker.com
func Restore(baseConfig *rest.Config, impersonate bool) (map[string]error, error) {
log.Info("Restoring stacks from backup")
kubeClient, err := kubernetes.NewForConfig(baseConfig)
if err != nil {
return nil, err
}
var (
source stacks.StackList
listOpts metav1.ListOptions
)
stackErrs := make(map[string]error)
config := *baseConfig
client, err := stacksclient.NewForConfig(&config)
if err != nil {
return nil, err
}
for {
err = kubeClient.CoreV1().RESTClient().Verb("GET").
RequestURI(fmt.Sprintf("/apis/%s/v1beta1/stackbackups", backupAPIGroup)).
VersionedParams(&listOpts, stacksscheme.ParameterCodec).
Do().
Into(&source)
if err != nil {
return nil, err
}
for _, stack := range source.Items {
stack.APIVersion = "compose.docker.com/v1beta1"
stack.Kind = "Stack"
stack.ResourceVersion = ""
if impersonate {
username := ""
if stack.Annotations != nil {
username = stack.Annotations[userAnnotationKey]
delete(stack.Annotations, userAnnotationKey)
}
if config.Impersonate.UserName != username {
config.Impersonate.UserName = username
log.Infof("Impersonating user %q", username)
if client, err = stacksclient.NewForConfig(&config); err != nil {
return nil, err
}
}
}
_, err = client.Stacks(stack.Namespace).WithSkipValidation().Create(&stack)
if err != nil {
stackErrs[fmt.Sprintf("%s/%s", stack.Namespace, stack.Name)] = err
if !apierrors.IsAlreadyExists(err) {
return stackErrs, errors.Wrap(err, "unable to restore stacks")
}
}
}
if source.Continue == "" {
break
}
listOpts.Continue = source.Continue
}
return stackErrs, nil
}
func dryRunStacks(source stacks.StackList, res map[string]error, coreClient corev1.ServicesGetter, appsClient appsv1beta2.AppsV1beta2Interface) error {
for _, stack := range source.Items {
fullname := fmt.Sprintf("%s/%s", stack.Namespace, stack.Name)
composeConfig, err := parsing.LoadStackData([]byte(stack.Spec.ComposeFile), nil)
if err != nil {
res[fullname] = err
continue
}
spec := conversions.FromComposeConfig(composeConfig)
internalStack := &internalversion.Stack{
ObjectMeta: v1.ObjectMeta{
Name: stack.Name,
Namespace: stack.Namespace,
},
Spec: internalversion.StackSpec{
Stack: spec,
},
}
errs := field.ErrorList{}
errs = append(errs, registry.ValidateObjectNames(internalStack)...)
errs = append(errs, registry.ValidateDryRun(internalStack)...)
errs = append(errs, registry.ValidateCollisions(coreClient, appsClient, internalStack)...)
aggregate := errs.ToAggregate()
if aggregate != nil {
res[fullname] = aggregate
}
}
return nil
}
// DryRun checks existing stacks for conversion errors or conflicts
func DryRun(config *rest.Config) (map[string]error, error) {
res := make(map[string]error)
log.Info("Performing dry-run")
kubeClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
var source stacks.StackList
listOpts := metav1.ListOptions{}
for {
err = kubeClient.CoreV1().RESTClient().Verb("GET").
RequestURI("/apis/compose.docker.com/v1beta1/stacks").
VersionedParams(&listOpts, stacksscheme.ParameterCodec).
Do().
Into(&source)
if err != nil {
return nil, err
}
if err = dryRunStacks(source, res, kubeClient.CoreV1(), kubeClient.AppsV1beta2()); err != nil {
return nil, err
}
if source.Continue == "" {
break
}
listOpts.Continue = source.Continue
}
return res, nil
}
// DeleteBackup deletes the backup CRD
func DeleteBackup(config *rest.Config) error {
extClient, err := apiextensionsclient.NewForConfig(config)
if err != nil {
return err
}
crds := extClient.CustomResourceDefinitions()
_, err = crds.Get("stackbackups."+backupAPIGroup, v1.GetOptions{})
if err == nil {
return crds.Delete("stackbackups."+backupAPIGroup, &v1.DeleteOptions{})
}
if err != nil && !apierrors.IsNotFound(err) {
return err
}
for {
_, err = crds.Get("stackbackups."+backupAPIGroup, metav1.GetOptions{})
if err != nil {
if apierrors.IsNotFound(err) {
return nil
}
return err
}
time.Sleep(time.Second)
}
}
// HasBackupCRD indicates if the backup crd is there
func HasBackupCRD(config *rest.Config) (bool, error) {
extClient, err := apiextensionsclient.NewForConfig(config)
if err != nil {
return false, err
}
crds := extClient.CustomResourceDefinitions()
_, err = crds.Get("stackbackups."+backupAPIGroup, v1.GetOptions{})
if err == nil {
return true, nil
}
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
}
// CRDCRD installs the CRD component of CRD install
func CRDCRD(config *rest.Config) error {
extClient, err := apiextensionsclient.NewForConfig(config)
if err != nil {
return err
}
crds := extClient.CustomResourceDefinitions()
_, err = crds.Create(&apiextensions.CustomResourceDefinition{
ObjectMeta: v1.ObjectMeta{
Name: "stacks.compose.docker.com",
},
Spec: apiextensions.CustomResourceDefinitionSpec{
Group: "compose.docker.com",
Version: "v1beta1",
Names: apiextensions.CustomResourceDefinitionNames{
Plural: "stacks",
Singular: "stack",
Kind: "Stack",
ListKind: "StackList",
},
Scope: apiextensions.NamespaceScoped,
},
})
return err
}
// UninstallComposeCRD uninstalls compose in CRD mode, preserving running stacks
func UninstallComposeCRD(config *rest.Config, namespace string) error {
if err := Uninstall(config, namespace, true); err != nil {
return err
}
WaitForUninstallCompletion(context.Background(), config, namespace, true)
if err := UninstallCRD(config); err != nil {
return err
}
WaitForUninstallCompletion(context.Background(), config, namespace, false)
return nil
}
// UninstallComposeAPIServer uninstalls compose in API server mode, preserving running stacks
func UninstallComposeAPIServer(config *rest.Config, namespace string) error {
// First, shoot the controller
log.Info("Removing controller")
apps, err := appsv1beta2.NewForConfig(config)
if err != nil {
return err
}
err = apps.Deployments(namespace).Delete("compose", &metav1.DeleteOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return err
}
log.Info("Unlinking stacks")
if err := UninstallCRD(config); err != nil {
return err
}
log.Info("Uninstalling all components")
if err := Uninstall(config, namespace, false); err != nil {
return err
}
log.Info("Waiting for uninstallation to complete")
WaitForUninstallCompletion(context.Background(), config, namespace, false)
return nil
}
// Update perform a full update operation, restoring the stacks
func Update(config *rest.Config, namespace, tag string, abortOnError bool) (map[string]error, error) {
if abortOnError {
errs, err := DryRun(config)
if err != nil {
return errs, err
}
if len(errs) != 0 {
return errs, errors.New("dry-run returned errors")
}
}
err := Backup(config, BackupPreviousErase)
if err != nil {
return nil, err
}
err = UninstallComposeCRD(config, namespace)
if err != nil {
return nil, err
}
installOptAPIAggregation := WithUnsafe(UnsafeOptions{
OptionsCommon: OptionsCommon{
Namespace: namespace,
Tag: tag,
ReconciliationInterval: constants.DefaultFullSyncInterval,
},
})
err = Do(context.Background(), config, installOptAPIAggregation, WithoutController())
if err != nil {
return nil, err
}
ready := false
for i := 0; i < 30; i++ {
running, err := IsRunning(config)
if err != nil {
return nil, err
}
if running {
ready = true
break
}
time.Sleep(time.Second)
}
if !ready {
return nil, errors.New("compose did not start properly")
}
errs, err := Restore(config, true)
err2 := Do(context.Background(), config, installOptAPIAggregation, WithControllerOnly())
if err2 != nil {
return errs, err2
}
return errs, err
}