Seed code for k8s multicloud plugin

This patch provides the initial seed code for the multicloud Kubernetes
plugin and also provides the plugin feature to add new Kubernetes
kinds.

Change-Id: Ie5ee414656665070cde2834c4855ac2ebc179a9a
Issue-ID: MULTICLOUD-301
Signed-off-by: Shashank Kumar Shankar <shashank.kumar.shankar@intel.com>
Signed-off-by: Victor Morales <victor.morales@intel.com>

3 files changed, 335 insertions, 0 deletions

diff --git a/src/k8splugin/plugins/deployment/plugin.go b/src/k8splugin/plugins/deployment/plugin.go
new file mode 100644
index 00000000..2b4c7cb7
--- /dev/null
+++ b/src/k8splugin/plugins/deployment/plugin.go
@@ -0,0 +1,136 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+
+	"k8s.io/client-go/kubernetes"
+
+	pkgerrors "github.com/pkg/errors"
+
+	appsV1 "k8s.io/api/apps/v1"
+	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/scheme"
+
+	"k8splugin/krd"
+)
+
+// CreateResource object in a specific Kubernetes Deployment
+func CreateResource(kubedata *krd.GenericKubeResourceData, kubeclient *kubernetes.Clientset) (string, error) {
+	if kubedata.Namespace == "" {
+		kubedata.Namespace = "default"
+	}
+
+	if _, err := os.Stat(kubedata.YamlFilePath); err != nil {
+		return "", pkgerrors.New("File " + kubedata.YamlFilePath + " not found")
+	}
+
+	log.Println("Reading deployment YAML")
+	rawBytes, err := ioutil.ReadFile(kubedata.YamlFilePath)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Deployment YAML file read error")
+	}
+
+	log.Println("Decoding deployment YAML")
+	decode := scheme.Codecs.UniversalDeserializer().Decode
+	obj, _, err := decode(rawBytes, nil, nil)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Deserialize deployment error")
+	}
+
+	switch o := obj.(type) {
+	case *appsV1.Deployment:
+		kubedata.DeploymentData = o
+	default:
+		return "", pkgerrors.New(kubedata.YamlFilePath + " contains another resource different than Deployment")
+	}
+
+	kubedata.DeploymentData.Namespace = kubedata.Namespace
+	kubedata.DeploymentData.Name = kubedata.InternalVNFID + "-" + kubedata.DeploymentData.Name
+
+	result, err := kubeclient.AppsV1().Deployments(kubedata.Namespace).Create(kubedata.DeploymentData)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Create Deployment error")
+	}
+
+	return result.GetObjectMeta().GetName(), nil
+}
+
+// ListResources of existing deployments hosted in a specific Kubernetes Deployment
+func ListResources(limit int64, namespace string, kubeclient *kubernetes.Clientset) (*[]string, error) {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	opts := metaV1.ListOptions{
+		Limit: limit,
+	}
+	opts.APIVersion = "apps/v1"
+	opts.Kind = "Deployment"
+
+	list, err := kubeclient.AppsV1().Deployments(namespace).List(opts)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Get Deployment list error")
+	}
+
+	result := make([]string, 0, limit)
+	if list != nil {
+		for _, deployment := range list.Items {
+			result = append(result, deployment.Name)
+		}
+	}
+
+	return &result, nil
+}
+
+// DeleteResource existing deployments hosting in a specific Kubernetes Deployment
+func DeleteResource(name string, namespace string, kubeclient *kubernetes.Clientset) error {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	log.Println("Deleting deployment: " + name)
+
+	deletePolicy := metaV1.DeletePropagationForeground
+	err := kubeclient.AppsV1().Deployments(namespace).Delete(name, &metaV1.DeleteOptions{
+		PropagationPolicy: &deletePolicy,
+	})
+
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete Deployment error")
+	}
+
+	return nil
+}
+
+// GetResource existing deployment hosting in a specific Kubernetes Deployment
+func GetResource(name string, namespace string, kubeclient *kubernetes.Clientset) (string, error) {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	opts := metaV1.GetOptions{}
+	opts.APIVersion = "apps/v1"
+	opts.Kind = "Deployment"
+
+	deployment, err := kubeclient.AppsV1().Deployments(namespace).Get(name, opts)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Get Deployment error")
+	}
+
+	return deployment.Name, nil
+}
diff --git a/src/k8splugin/plugins/namespace/plugin.go b/src/k8splugin/plugins/namespace/plugin.go
new file mode 100644
index 00000000..986de863
--- /dev/null
+++ b/src/k8splugin/plugins/namespace/plugin.go
@@ -0,0 +1,68 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	pkgerrors "github.com/pkg/errors"
+
+	coreV1 "k8s.io/api/core/v1"
+	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+)
+
+// CreateResource is used to create a new Namespace
+func CreateResource(namespace string, client *kubernetes.Clientset) error {
+	namespaceStruct := &coreV1.Namespace{
+		ObjectMeta: metaV1.ObjectMeta{
+			Name: namespace,
+		},
+	}
+	_, err := client.CoreV1().Namespaces().Create(namespaceStruct)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Create Namespace error")
+	}
+	return nil
+}
+
+// GetResource is used to check if a given namespace actually exists in Kubernetes
+func GetResource(namespace string, client *kubernetes.Clientset) (bool, error) {
+	opts := metaV1.ListOptions{}
+
+	namespaceList, err := client.CoreV1().Namespaces().List(opts)
+	if err != nil {
+		return false, pkgerrors.Wrap(err, "Get Namespace list error")
+	}
+
+	for _, ns := range namespaceList.Items {
+		if namespace == ns.Name {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// DeleteResource is used to delete a namespace
+func DeleteResource(namespace string, client *kubernetes.Clientset) error {
+	deletePolicy := metaV1.DeletePropagationForeground
+
+	err := client.CoreV1().Namespaces().Delete(namespace, &metaV1.DeleteOptions{
+		PropagationPolicy: &deletePolicy,
+	})
+
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete Namespace error")
+	}
+	return nil
+}
diff --git a/src/k8splugin/plugins/service/plugin.go b/src/k8splugin/plugins/service/plugin.go
new file mode 100644
index 00000000..36ef24f6
--- /dev/null
+++ b/src/k8splugin/plugins/service/plugin.go
@@ -0,0 +1,131 @@
+/*
+Copyright 2018 Intel Corporation.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+
+	"k8s.io/client-go/kubernetes"
+
+	pkgerrors "github.com/pkg/errors"
+
+	coreV1 "k8s.io/api/core/v1"
+	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/scheme"
+
+	"k8splugin/krd"
+)
+
+// CreateResource object in a specific Kubernetes Deployment
+func CreateResource(kubedata *krd.GenericKubeResourceData, kubeclient *kubernetes.Clientset) (string, error) {
+	if kubedata.Namespace == "" {
+		kubedata.Namespace = "default"
+	}
+
+	if _, err := os.Stat(kubedata.YamlFilePath); err != nil {
+		return "", pkgerrors.New("File " + kubedata.YamlFilePath + " not found")
+	}
+
+	log.Println("Reading service YAML")
+	rawBytes, err := ioutil.ReadFile(kubedata.YamlFilePath)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Service YAML file read error")
+	}
+
+	log.Println("Decoding service YAML")
+	decode := scheme.Codecs.UniversalDeserializer().Decode
+	obj, _, err := decode(rawBytes, nil, nil)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Deserialize service error")
+	}
+
+	switch o := obj.(type) {
+	case *coreV1.Service:
+		kubedata.ServiceData = o
+	default:
+		return "", pkgerrors.New(kubedata.YamlFilePath + " contains another resource different than Service")
+	}
+
+	kubedata.ServiceData.Namespace = kubedata.Namespace
+	kubedata.ServiceData.Name = kubedata.InternalVNFID + "-" + kubedata.ServiceData.Name
+
+	result, err := kubeclient.CoreV1().Services(kubedata.Namespace).Create(kubedata.ServiceData)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Create Service error")
+	}
+	return result.GetObjectMeta().GetName(), nil
+}
+
+// ListResources of existing deployments hosted in a specific Kubernetes Deployment
+func ListResources(limit int64, namespace string, kubeclient *kubernetes.Clientset) (*[]string, error) {
+	if namespace == "" {
+		namespace = "default"
+	}
+	opts := metaV1.ListOptions{
+		Limit: limit,
+	}
+	opts.APIVersion = "apps/v1"
+	opts.Kind = "Service"
+
+	list, err := kubeclient.CoreV1().Services(namespace).List(opts)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Get Service list error")
+	}
+	result := make([]string, 0, limit)
+	if list != nil {
+		for _, service := range list.Items {
+			result = append(result, service.Name)
+		}
+	}
+	return &result, nil
+}
+
+// DeleteResource deletes an existing Kubernetes service
+func DeleteResource(name string, namespace string, kubeclient *kubernetes.Clientset) error {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	log.Println("Deleting service: " + name)
+
+	deletePolicy := metaV1.DeletePropagationForeground
+	err := kubeclient.CoreV1().Services(namespace).Delete(name, &metaV1.DeleteOptions{
+		PropagationPolicy: &deletePolicy,
+	})
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete Service error")
+	}
+
+	return nil
+}
+
+// GetResource existing service hosting in a specific Kubernetes Service
+func GetResource(name string, namespace string, kubeclient *kubernetes.Clientset) (string, error) {
+	if namespace == "" {
+		namespace = "default"
+	}
+
+	opts := metaV1.GetOptions{}
+	opts.APIVersion = "apps/v1"
+	opts.Kind = "Service"
+
+	service, err := kubeclient.CoreV1().Services(namespace).Get(name, opts)
+	if err != nil {
+		return "", pkgerrors.Wrap(err, "Get Deployment error")
+	}
+
+	return service.Name, nil
+}