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scale.go
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scale.go
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package registry
import (
"context"
"fmt"
"github.com/docker/compose-on-kubernetes/api/compose/latest"
"github.com/docker/compose-on-kubernetes/internal/conversions"
"github.com/docker/compose-on-kubernetes/internal/convert"
iv "github.com/docker/compose-on-kubernetes/internal/internalversion"
"github.com/docker/compose-on-kubernetes/internal/stackresources"
log "github.com/sirupsen/logrus"
coretypes "k8s.io/api/core/v1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apiserver/pkg/registry/rest"
appsv1 "k8s.io/client-go/kubernetes/typed/apps/v1"
restclient "k8s.io/client-go/rest"
)
type stackScaleRest struct {
storage stackRESTStore
config *restclient.Config
}
var _ rest.Storage = &stackScaleRest{}
var _ rest.Getter = &stackScaleRest{}
var _ rest.Updater = &stackScaleRest{}
// NewStackScaleRest returns a rest storage for scale subresource
func NewStackScaleRest(store stackRESTStore, config *restclient.Config) rest.Storage {
return &stackScaleRest{storage: store, config: config}
}
func (r *stackScaleRest) New() runtime.Object {
return &latest.Scale{}
}
func (r *stackScaleRest) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
stack, err := r.storage.GetStack(ctx, name, options)
if err != nil {
return nil, err
}
res := latest.Scale{
Spec: make(map[string]int),
Status: make(map[string]int),
}
for _, s := range stack.Spec.Stack.Services {
count := 1
switch {
case s.Deploy.Mode == "global":
count = -1
case s.Deploy.Replicas != nil:
count = int(*s.Deploy.Replicas)
}
res.Spec[s.Name] = count
}
apps, err := appsv1.NewForConfig(r.config)
if err != nil {
log.Errorf("Failed to get apps: %s", err)
return nil, err
}
stackLatest, err := conversions.StackFromInternalV1alpha3(stack)
if err != nil {
log.Errorf("Failed to convert to StackDefinition: %s", err)
return nil, err
}
strategy, err := convert.ServiceStrategyFor(coretypes.ServiceTypeLoadBalancer) // in that case, service strategy does not really matter
if err != nil {
log.Errorf("Failed to convert to StackDefinition: %s", err)
return nil, err
}
stackDef, err := convert.StackToStack(*stackLatest, strategy, stackresources.EmptyStackState)
if err != nil {
log.Errorf("Failed to convert to StackDefinition: %s", err)
return nil, err
}
for _, v := range stackDef.Deployments {
dep, err := apps.Deployments(stack.Namespace).Get(v.Name, metav1.GetOptions{})
if err != nil {
log.Errorf("Failed to get Deployment for %s: %s", v.Name, err)
} else {
res.Status[v.Name] = int(dep.Status.AvailableReplicas)
}
}
for _, v := range stackDef.Statefulsets {
ss, err := apps.StatefulSets(stack.Namespace).Get(v.Name, metav1.GetOptions{})
if err != nil {
log.Errorf("Failed to get StatefulSet for %s: %s", v.Name, err)
} else {
res.Status[v.Name] = int(ss.Status.ReadyReplicas)
}
}
for _, v := range stackDef.Daemonsets {
ds, err := apps.DaemonSets(stack.Namespace).Get(v.Name, metav1.GetOptions{})
if err != nil {
log.Errorf("Failed to get StatefulSet for %s: %s", v.Name, err)
} else {
res.Status[v.Name] = int(ds.Status.NumberAvailable)
}
}
return &res, nil
}
func (r *stackScaleRest) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo,
createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
scale, err := r.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, false, err
}
newScalero, err := objInfo.UpdatedObject(ctx, scale)
if err != nil {
return nil, false, err
}
newScale := newScalero.(*latest.Scale)
log.Infof("Scale update %s: %v", name, newScale.Spec)
return r.storage.UpdateStack(ctx, name, func(ctx context.Context, newObj *iv.Stack, oldObj *iv.Stack) (transformedNewObj *iv.Stack, err error) {
for target, count := range newScale.Spec {
r := uint64(count)
hit := false
for i, srv := range newObj.Spec.Stack.Services {
if srv.Name == target {
newObj.Spec.Stack.Services[i].Deploy.Replicas = &r
hit = true
break
}
}
if !hit {
return nil, fmt.Errorf("service %q not found in stack", target)
}
}
if !apiequality.Semantic.DeepEqual(oldObj.Spec, newObj.Spec) {
newObj.Generation = oldObj.Generation + 1
}
return newObj, nil
}, createValidation, updateValidation, forceAllowCreate, options)
}