/
resourcemanager.go
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/
resourcemanager.go
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package deployment
import (
"context"
"fmt"
"strings"
"github.com/avast/retry-go"
"github.com/kyma-incubator/hydroform/parallel-install/pkg/config"
"github.com/kyma-incubator/hydroform/parallel-install/pkg/logger"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
)
//go:generate mockery --name ResourceManager
// ResourceManager manages resources on a k8s cluster.
type ResourceManager interface {
// CreateResource from a given object and schema on k8s cluster.
// Performs retries on unsuccessful resource creation action.
CreateResource(resource *unstructured.Unstructured, gvk schema.GroupVersionKind, opts metav1.CreateOptions) error
// GetResource of a given name from a k8s cluster, that matches the schema.
// Performs retries on unsuccessful resource retrieval action.
GetResource(resourceName string, gvk schema.GroupVersionKind, opts metav1.GetOptions) (*unstructured.Unstructured, error)
// UpdateResource on a k8s cluster, that matches the schema.
// Performs retries on unsuccessful resource update action.
UpdateResource(resource *unstructured.Unstructured, gvk schema.GroupVersionKind, opts metav1.UpdateOptions) (*unstructured.Unstructured, error)
// DeleteCollectionOfResources from a k8s cluster, that match the schema, using query options for filtering them.
// Performs retries on unsuccessful resources delete action.
DeleteCollectionOfResources(gvk schema.GroupVersionKind, opts metav1.DeleteOptions, listOps metav1.ListOptions) error
}
// DefaultResourceManager provides a default implementation of ResourceManager.
type DefaultResourceManager struct {
dynamicClient dynamic.Interface
log logger.Interface
retryOptions []retry.Option
}
// NewDefaultResourceManager creates a new instance of ResourceManager.
func NewDefaultResourceManager(kubeconfigSource config.KubeconfigSource, log logger.Interface, retryOptions []retry.Option) (*DefaultResourceManager, error) {
restConfig, err := config.RestConfig(kubeconfigSource)
if err != nil {
return nil, err
}
dynamicClient, err := dynamic.NewForConfig(restConfig)
if err != nil {
return nil, err
}
return &DefaultResourceManager{
dynamicClient: dynamicClient,
log: log,
retryOptions: retryOptions,
}, nil
}
func (c *DefaultResourceManager) CreateResource(resource *unstructured.Unstructured, gvk schema.GroupVersionKind, opts metav1.CreateOptions) error {
var err error
err = retry.Do(func() error {
if _, err = c.dynamicClient.Resource(retrieveGvrFrom(gvk)).Create(context.TODO(), resource, opts); err != nil {
c.log.Errorf("Error occurred during resource create: %s", err.Error())
return err
}
return nil
}, c.retryOptions...)
if err != nil {
return err
}
return nil
}
func (c *DefaultResourceManager) GetResource(resourceName string, gvk schema.GroupVersionKind, opts metav1.GetOptions) (obj *unstructured.Unstructured, err error) {
err = retry.Do(func() error {
obj, err = c.dynamicClient.Resource(retrieveGvrFrom(gvk)).Get(context.TODO(), resourceName, opts)
if err != nil {
if apierrors.IsNotFound(err) {
c.log.Infof("Resource %s was not found.", resourceName)
return nil
}
c.log.Errorf("Error occurred during resource get: %s", err.Error())
return err
}
return err
}, c.retryOptions...)
if err != nil {
return nil, err
}
return obj, nil
}
func (c *DefaultResourceManager) UpdateResource(resource *unstructured.Unstructured, gvk schema.GroupVersionKind, opts metav1.UpdateOptions) (obj *unstructured.Unstructured, err error) {
gvr := retrieveGvrFrom(gvk)
err = retry.Do(func() error {
latestResource, err := c.dynamicClient.Resource(gvr).Get(context.TODO(), resource.GetName(), metav1.GetOptions{})
if err != nil {
return err
}
resource.SetResourceVersion(latestResource.GetResourceVersion())
obj, err = c.dynamicClient.Resource(gvr).Update(context.TODO(), resource, opts)
if err != nil {
c.log.Errorf("Error occurred during resource update: %s", err.Error())
return err
}
return nil
}, c.retryOptions...)
if err != nil {
return nil, err
}
return obj, nil
}
func (c *DefaultResourceManager) DeleteCollectionOfResources(gvk schema.GroupVersionKind, opts metav1.DeleteOptions, listOpts metav1.ListOptions) error {
var err error
err = retry.Do(func() error {
if err = c.dynamicClient.Resource(retrieveGvrFrom(gvk)).DeleteCollection(context.TODO(), opts, listOpts); err != nil {
c.log.Errorf("Error occurred during resources delete: %s", err.Error())
return err
}
return nil
}, c.retryOptions...)
if err != nil {
return err
}
return nil
}
func retrieveGvrFrom(gvk schema.GroupVersionKind) schema.GroupVersionResource {
return schema.GroupVersionResource{
Group: gvk.Group,
Version: gvk.Version,
Resource: pluralForm(gvk.Kind),
}
}
func pluralForm(singular string) string {
return fmt.Sprintf("%ss", strings.ToLower(singular))
}