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authorKiran Kamineni <kiran.k.kamineni@intel.com>2019-05-30 14:43:06 -0700
committerKiran Kamineni <kiran.k.kamineni@intel.com>2019-06-06 17:32:41 -0700
commitd780f1b30c98a27d269e3e05423e9e54e0e022f6 (patch)
tree3d01a1fab1a846206ae714f94838de2f0a659e13 /src/k8splugin/internal/app/client.go
parentf006c55c0793a0cacac5aa45ba7f13fd5c6ef5f4 (diff)
Plugin code refactoring
The plugin code has been refactored to implement a common interface. This will allow us to do plugin validation at loadtime of the plugin instead of at runtime. This also makes the code calling the plugins cleaner and easier to read. Issue-ID: MULTICLOUD-557 Change-Id: Ice2bcc9b850d7c0e1707dcc42132c63dd77472a7 Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>
Diffstat (limited to 'src/k8splugin/internal/app/client.go')
-rw-r--r--src/k8splugin/internal/app/client.go181
1 files changed, 34 insertions, 147 deletions
diff --git a/src/k8splugin/internal/app/client.go b/src/k8splugin/internal/app/client.go
index 158d21de..9a5aa9e9 100644
--- a/src/k8splugin/internal/app/client.go
+++ b/src/k8splugin/internal/app/client.go
@@ -16,15 +16,16 @@ package app
import (
"log"
"os"
- "strings"
+ "time"
- utils "k8splugin/internal"
"k8splugin/internal/config"
"k8splugin/internal/connection"
"k8splugin/internal/helm"
+ "k8splugin/internal/plugin"
pkgerrors "github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/meta"
+ "k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
@@ -32,16 +33,12 @@ import (
"k8s.io/client-go/tools/clientcmd"
)
-// PluginReference is the interface that is implemented
-type PluginReference interface {
- Create(yamlFilePath string, namespace string, client *KubernetesClient) (string, error)
- Delete(resource helm.KubernetesResource, namespace string, client *KubernetesClient) error
-}
-
+// KubernetesClient encapsulates the different clients' interfaces
+// we need when interacting with a Kubernetes cluster
type KubernetesClient struct {
- clientSet *kubernetes.Clientset
+ clientSet kubernetes.Interface
dynamicClient dynamic.Interface
- discoverClient *discovery.DiscoveryClient
+ discoverClient discovery.CachedDiscoveryInterface
restMapper meta.RESTMapper
}
@@ -86,40 +83,35 @@ func (k *KubernetesClient) init(cloudregion string) error {
return pkgerrors.Wrap(err, "Creating dynamic client")
}
- k.discoverClient, err = discovery.NewDiscoveryClientForConfig(config)
+ k.discoverClient, err = discovery.NewCachedDiscoveryClientForConfig(config, os.TempDir(), "", 10*time.Minute)
if err != nil {
return pkgerrors.Wrap(err, "Creating discovery client")
}
+ k.restMapper = restmapper.NewDeferredDiscoveryRESTMapper(k.discoverClient)
return nil
}
func (k *KubernetesClient) ensureNamespace(namespace string) error {
- namespacePlugin, ok := utils.LoadedPlugins["namespace"]
- if !ok {
- return pkgerrors.New("No plugin for namespace resource found")
- }
- symGetNamespaceFunc, err := namespacePlugin.Lookup("Get")
+ pluginImpl, err := plugin.GetPluginByKind("Namespace")
if err != nil {
- return pkgerrors.Wrap(err, "Error fetching get namespace function")
+ return pkgerrors.Wrap(err, "Loading Namespace Plugin")
}
- ns, _ := symGetNamespaceFunc.(func(string, string, kubernetes.Interface) (string, error))(
- namespace, namespace, k.clientSet)
+ ns, err := pluginImpl.Get(helm.KubernetesResource{
+ Name: namespace,
+ GVK: schema.GroupVersionKind{
+ Group: "",
+ Version: "v1",
+ Kind: "Namespace",
+ },
+ }, namespace, k)
if ns == "" {
log.Println("Creating " + namespace + " namespace")
- symGetNamespaceFunc, err := namespacePlugin.Lookup("Create")
- if err != nil {
- return pkgerrors.Wrap(err, "Error fetching create namespace plugin")
- }
- namespaceResource := &utils.ResourceData{
- Namespace: namespace,
- }
- _, err = symGetNamespaceFunc.(func(*utils.ResourceData, kubernetes.Interface) (string, error))(
- namespaceResource, k.clientSet)
+ _, err = pluginImpl.Create("", namespace, k)
if err != nil {
return pkgerrors.Wrap(err, "Error creating "+namespace+" namespace")
}
@@ -127,50 +119,6 @@ func (k *KubernetesClient) ensureNamespace(namespace string) error {
return nil
}
-func (k *KubernetesClient) createGeneric(resTempl helm.KubernetesResourceTemplate,
- namespace string) (helm.KubernetesResource, error) {
-
- log.Println("Processing Kind: " + resTempl.GVK.Kind)
-
- //Check if have the mapper before loading the plugin
- err := k.updateMapper()
- if err != nil {
- return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Unable to create RESTMapper")
- }
-
- pluginObject, ok := utils.LoadedPlugins["generic"]
- if !ok {
- return helm.KubernetesResource{}, pkgerrors.New("No generic plugin found")
- }
-
- symbol, err := pluginObject.Lookup("ExportedVariable")
- if err != nil {
- return helm.KubernetesResource{}, pkgerrors.Wrap(err, "No ExportedVariable symbol found")
- }
-
- //Assert if it implements the PluginReference interface
- genericPlugin, ok := symbol.(PluginReference)
- if !ok {
- return helm.KubernetesResource{}, pkgerrors.New("ExportedVariable is not PluginReference type")
- }
-
- if _, err := os.Stat(resTempl.FilePath); os.IsNotExist(err) {
- return helm.KubernetesResource{}, pkgerrors.New("File " + resTempl.FilePath + "does not exists")
- }
-
- log.Println("Processing file: " + resTempl.FilePath)
-
- name, err := genericPlugin.Create(resTempl.FilePath, namespace, k)
- if err != nil {
- return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error in generic plugin")
- }
-
- return helm.KubernetesResource{
- GVK: resTempl.GVK,
- Name: name,
- }, nil
-}
-
func (k *KubernetesClient) createKind(resTempl helm.KubernetesResourceTemplate,
namespace string) (helm.KubernetesResource, error) {
@@ -182,28 +130,16 @@ func (k *KubernetesClient) createKind(resTempl helm.KubernetesResourceTemplate,
log.Println("Processing file: " + resTempl.FilePath)
- //Populate the namespace from profile instead of instance body
- genericKubeData := &utils.ResourceData{
- YamlFilePath: resTempl.FilePath,
- Namespace: namespace,
- }
-
- typePlugin, ok := utils.LoadedPlugins[strings.ToLower(resTempl.GVK.Kind)]
- if !ok {
- log.Println("No plugin for kind " + resTempl.GVK.Kind + " found. Using generic Plugin")
- return k.createGeneric(resTempl, namespace)
- }
-
- symCreateResourceFunc, err := typePlugin.Lookup("Create")
+ pluginImpl, err := plugin.GetPluginByKind(resTempl.GVK.Kind)
if err != nil {
- return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error fetching "+resTempl.GVK.Kind+" plugin")
+ return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error loading plugin")
}
- createdResourceName, err := symCreateResourceFunc.(func(*utils.ResourceData, kubernetes.Interface) (string, error))(
- genericKubeData, k.clientSet)
+ createdResourceName, err := pluginImpl.Create(resTempl.FilePath, namespace, k)
if err != nil {
return helm.KubernetesResource{}, pkgerrors.Wrap(err, "Error in plugin "+resTempl.GVK.Kind+" plugin")
}
+
log.Print(createdResourceName + " created")
return helm.KubernetesResource{
GVK: resTempl.GVK,
@@ -231,58 +167,18 @@ func (k *KubernetesClient) createResources(sortedTemplates []helm.KubernetesReso
return createdResources, nil
}
-func (k *KubernetesClient) deleteGeneric(resource helm.KubernetesResource, namespace string) error {
- log.Println("Deleting Kind: " + resource.GVK.Kind)
-
- pluginObject, ok := utils.LoadedPlugins["generic"]
- if !ok {
- return pkgerrors.New("No generic plugin found")
- }
-
- //Check if have the mapper before loading the plugin
- err := k.updateMapper()
- if err != nil {
- return pkgerrors.Wrap(err, "Unable to create RESTMapper")
- }
-
- symbol, err := pluginObject.Lookup("ExportedVariable")
- if err != nil {
- return pkgerrors.Wrap(err, "No ExportedVariable symbol found")
- }
-
- //Assert that it implements the PluginReference interface
- genericPlugin, ok := symbol.(PluginReference)
- if !ok {
- return pkgerrors.New("ExportedVariable is not PluginReference type")
- }
-
- err = genericPlugin.Delete(resource, namespace, k)
- if err != nil {
- return pkgerrors.Wrap(err, "Error in generic plugin")
- }
-
- return nil
-}
-
func (k *KubernetesClient) deleteKind(resource helm.KubernetesResource, namespace string) error {
log.Println("Deleting Kind: " + resource.GVK.Kind)
- typePlugin, ok := utils.LoadedPlugins[strings.ToLower(resource.GVK.Kind)]
- if !ok {
- log.Println("No plugin for kind " + resource.GVK.Kind + " found. Using generic Plugin")
- return k.deleteGeneric(resource, namespace)
- }
-
- symDeleteResourceFunc, err := typePlugin.Lookup("Delete")
+ pluginImpl, err := plugin.GetPluginByKind(resource.GVK.Kind)
if err != nil {
- return pkgerrors.Wrap(err, "Error finding Delete symbol in plugin")
+ return pkgerrors.Wrap(err, "Error loading plugin")
}
log.Println("Deleting resource: " + resource.Name)
- err = symDeleteResourceFunc.(func(string, string, kubernetes.Interface) error)(
- resource.Name, namespace, k.clientSet)
+ err = pluginImpl.Delete(resource, namespace, k)
if err != nil {
- return pkgerrors.Wrap(err, "Error destroying "+resource.Name)
+ return pkgerrors.Wrap(err, "Error deleting "+resource.Name)
}
return nil
@@ -300,21 +196,6 @@ func (k *KubernetesClient) deleteResources(resources []helm.KubernetesResource,
return nil
}
-func (k *KubernetesClient) updateMapper() error {
- //Create restMapper if not already done
- if k.restMapper != nil {
- return nil
- }
-
- groupResources, err := restmapper.GetAPIGroupResources(k.discoverClient)
- if err != nil {
- return pkgerrors.Wrap(err, "Get GroupResources")
- }
-
- k.restMapper = restmapper.NewDiscoveryRESTMapper(groupResources)
- return nil
-}
-
//GetMapper returns the RESTMapper that was created for this client
func (k *KubernetesClient) GetMapper() meta.RESTMapper {
return k.restMapper
@@ -325,3 +206,9 @@ func (k *KubernetesClient) GetMapper() meta.RESTMapper {
func (k *KubernetesClient) GetDynamicClient() dynamic.Interface {
return k.dynamicClient
}
+
+// GetStandardClient returns the standard client that can be used to handle
+// standard kubernetes kinds
+func (k *KubernetesClient) GetStandardClient() kubernetes.Interface {
+ return k.clientSet
+}