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authorKiran Kamineni <kiran.k.kamineni@intel.com>2019-04-08 16:36:34 -0700
committerKiran Kamineni <kiran.k.kamineni@intel.com>2019-04-10 11:54:00 -0700
commitf940c42e563e67279cc28c7c129a340dc800fd30 (patch)
tree2fe49c08264378907a3c2a5da5b9af070fb04ac2 /src
parent9d71e9114baba71266cded1f4f805cd46a378137 (diff)
Add support for generic plugin
Add support for generic kinds We are currently using a known map to find the group version resource for a kind. Issue-ID: MULTICLOUD-350 Change-Id: I5a64f73760b73cf92b9a3fab8c22ad54e0a5f84f Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>
Diffstat (limited to 'src')
-rw-r--r--src/k8splugin/go.mod2
-rw-r--r--src/k8splugin/go.sum1
-rw-r--r--src/k8splugin/internal/app/client.go132
-rw-r--r--src/k8splugin/plugins/generic/plugin.go109
4 files changed, 239 insertions, 5 deletions
diff --git a/src/k8splugin/go.mod b/src/k8splugin/go.mod
index 29a10ecb..00ee2c8e 100644
--- a/src/k8splugin/go.mod
+++ b/src/k8splugin/go.mod
@@ -75,7 +75,7 @@ require (
gopkg.in/square/go-jose.v2 v2.2.2 // indirect
gopkg.in/yaml.v2 v2.2.1
k8s.io/api v0.0.0-20181126151915-b503174bad59
- k8s.io/apiextensions-apiserver v0.0.0-20181126155829-0cd23ebeb688 // indirect
+ k8s.io/apiextensions-apiserver v0.0.0-20181126155829-0cd23ebeb688
k8s.io/apimachinery v0.0.0-20181126123746-eddba98df674
k8s.io/apiserver v0.0.0-20181126153457-92fdef3a232a // indirect
k8s.io/cli-runtime v0.0.0-20190107235426-31214e12222d // indirect
diff --git a/src/k8splugin/go.sum b/src/k8splugin/go.sum
index f22fe8da..e5f34549 100644
--- a/src/k8splugin/go.sum
+++ b/src/k8splugin/go.sum
@@ -257,6 +257,7 @@ k8s.io/client-go v9.0.0+incompatible h1:/PdJjifJTjMFe0G4ESclZDcwF1+bFePTJ2xf+MXj
k8s.io/client-go v9.0.0+incompatible/go.mod h1:7vJpHMYJwNQCWgzmNV+VYUl1zCObLyodBc8nIyt8L5s=
k8s.io/client-go v10.0.0+incompatible h1:h3fciHPG0O5QEzATTFoRw/YGtDsU6pxrMrAhxiTtcq0=
k8s.io/client-go v10.0.0+incompatible/go.mod h1:7vJpHMYJwNQCWgzmNV+VYUl1zCObLyodBc8nIyt8L5s=
+k8s.io/client-go v11.0.0+incompatible h1:X3ykd+Z4G8MojP9TVDOR+h/IrpYJEolfR8W2B/FGKrk=
k8s.io/helm v2.12.1+incompatible h1:Fw6it7ALJfqbbX95U3is3aswD6E8nh4aUYtvgzfna8A=
k8s.io/helm v2.12.1+incompatible/go.mod h1:LZzlS4LQBHfciFOurYBFkCMTaZ0D1l+p0teMg7TSULI=
k8s.io/helm v2.12.2+incompatible h1:vtddbkiGNMOd8maDDZDc111Rm9E5JeeNWDndows18i8=
diff --git a/src/k8splugin/internal/app/client.go b/src/k8splugin/internal/app/client.go
index cb6f0eca..cd1ec8a2 100644
--- a/src/k8splugin/internal/app/client.go
+++ b/src/k8splugin/internal/app/client.go
@@ -21,13 +21,26 @@ import (
utils "k8splugin/internal"
pkgerrors "github.com/pkg/errors"
+ "k8s.io/apimachinery/pkg/api/meta"
+ "k8s.io/client-go/discovery"
+ "k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
+ "k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/helm/pkg/tiller"
)
+// KubernetesResource is the interface that is implemented
+type KubernetesResource interface {
+ Create(yamlFilePath string, namespace string, client *KubernetesClient) (string, error)
+ Delete(kind string, name string, namespace string, client *KubernetesClient) error
+}
+
type KubernetesClient struct {
- clientSet *kubernetes.Clientset
+ clientSet *kubernetes.Clientset
+ dynamicClient dynamic.Interface
+ discoverClient *discovery.DiscoveryClient
+ restMapper meta.RESTMapper
}
// GetKubeClient loads the Kubernetes configuation values stored into the local configuration file
@@ -46,6 +59,16 @@ func (k *KubernetesClient) init(configPath string) error {
return err
}
+ k.dynamicClient, err = dynamic.NewForConfig(config)
+ if err != nil {
+ return pkgerrors.Wrap(err, "Creating dynamic client")
+ }
+
+ k.discoverClient, err = discovery.NewDiscoveryClientForConfig(config)
+ if err != nil {
+ return pkgerrors.Wrap(err, "Creating discovery client")
+ }
+
return nil
}
@@ -82,6 +105,50 @@ func (k *KubernetesClient) ensureNamespace(namespace string) error {
return nil
}
+func (k *KubernetesClient) createGeneric(kind string, files []string, namespace string) ([]string, error) {
+
+ log.Println("Processing items of Kind: " + kind)
+
+ //Check if have the mapper before loading the plugin
+ err := k.updateMapper()
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Unable to create RESTMapper")
+ }
+
+ pluginObject, ok := utils.LoadedPlugins["generic"]
+ if !ok {
+ return nil, pkgerrors.New("No generic plugin found")
+ }
+
+ symbol, err := pluginObject.Lookup("ExportedVariable")
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "No ExportedVariable symbol found")
+ }
+
+ genericPlugin, ok := symbol.(KubernetesResource)
+ if !ok {
+ return nil, pkgerrors.New("ExportedVariable is not KubernetesResource type")
+ }
+
+ //Iterate over each file of a particular kind here
+ var resourcesCreated []string
+ for _, f := range files {
+ if _, err := os.Stat(f); os.IsNotExist(err) {
+ return nil, pkgerrors.New("File " + f + "does not exists")
+ }
+
+ log.Println("Processing file: " + f)
+
+ name, err := genericPlugin.Create(f, namespace, k)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Error in generic plugin")
+ }
+
+ resourcesCreated = append(resourcesCreated, name)
+ }
+ return resourcesCreated, nil
+}
+
func (k *KubernetesClient) createKind(kind string, files []string, namespace string) ([]string, error) {
log.Println("Processing items of Kind: " + kind)
@@ -103,7 +170,8 @@ func (k *KubernetesClient) createKind(kind string, files []string, namespace str
typePlugin, ok := utils.LoadedPlugins[strings.ToLower(kind)]
if !ok {
- return nil, pkgerrors.New("No plugin for kind " + kind + " found")
+ log.Println("No plugin for kind " + kind + " found. Using generic Plugin")
+ return k.createGeneric(kind, files, namespace)
}
symCreateResourceFunc, err := typePlugin.Lookup("Create")
@@ -163,17 +231,47 @@ func (k *KubernetesClient) createResources(resMap map[string][]string,
return createdResourceMap, nil
}
+func (k *KubernetesClient) deleteGeneric(kind string, resources []string, namespace string) error {
+ log.Println("Deleting items of Kind: " + kind)
+
+ pluginObject, ok := utils.LoadedPlugins["generic"]
+ if !ok {
+ return pkgerrors.New("No generic plugin found")
+ }
+
+ symbol, err := pluginObject.Lookup("ExportedVariable")
+ if err != nil {
+ return pkgerrors.Wrap(err, "No ExportedVariable symbol found")
+ }
+
+ //Assert that it implements the KubernetesResource
+ genericPlugin, ok := symbol.(KubernetesResource)
+ if !ok {
+ return pkgerrors.New("ExportedVariable is not KubernetesResource type")
+ }
+
+ for _, res := range resources {
+ err = genericPlugin.Delete(kind, res, namespace, k)
+ if err != nil {
+ return pkgerrors.Wrap(err, "Error in generic plugin")
+ }
+ }
+
+ return nil
+}
+
func (k *KubernetesClient) deleteKind(kind string, resources []string, namespace string) error {
log.Println("Deleting items of Kind: " + kind)
typePlugin, ok := utils.LoadedPlugins[strings.ToLower(kind)]
if !ok {
- return pkgerrors.New("No plugin for resource " + kind + " found")
+ log.Println("No plugin for kind " + kind + " found. Using generic Plugin")
+ return k.deleteGeneric(kind, resources, namespace)
}
symDeleteResourceFunc, err := typePlugin.Lookup("Delete")
if err != nil {
- return pkgerrors.Wrap(err, "Error fetching "+kind+" plugin")
+ return pkgerrors.Wrap(err, "Error findinf Delete symbol in plugin")
}
for _, res := range resources {
@@ -198,3 +296,29 @@ func (k *KubernetesClient) deleteResources(resMap map[string][]string, namespace
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
+}
+
+//GetDynamicClient returns the dynamic client that is needed for
+//unstructured REST calls to the apiserver
+func (k *KubernetesClient) GetDynamicClient() dynamic.Interface {
+ return k.dynamicClient
+}
diff --git a/src/k8splugin/plugins/generic/plugin.go b/src/k8splugin/plugins/generic/plugin.go
new file mode 100644
index 00000000..b0cf609c
--- /dev/null
+++ b/src/k8splugin/plugins/generic/plugin.go
@@ -0,0 +1,109 @@
+/*
+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 (
+ "log"
+
+ pkgerrors "github.com/pkg/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/kubernetes/scheme"
+
+ utils "k8splugin/internal"
+ "k8splugin/internal/app"
+)
+
+type genericPlugin struct {
+}
+
+var kindToGVRMap = map[string]schema.GroupVersionResource{
+ "ConfigMap": schema.GroupVersionResource{Group: "", Version: "v1", Resource: "configmaps"},
+ "StatefulSet": schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "statefulsets"},
+ "Job": schema.GroupVersionResource{Group: "batch", Version: "v1", Resource: "jobs"},
+ "Pod": schema.GroupVersionResource{Group: "", Version: "v1", Resource: "pods"},
+ "DaemonSet": schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "daemonsets"},
+ "CustomResourceDefinition": schema.GroupVersionResource{
+ Group: "apiextensions.k8s.io", Version: "v1beta1", Resource: "customresourcedefinitions",
+ },
+}
+
+// Create deployment object in a specific Kubernetes cluster
+func (g genericPlugin) Create(yamlFilePath string, namespace string, client *app.KubernetesClient) (string, error) {
+ if namespace == "" {
+ namespace = "default"
+ }
+
+ //Decode the yaml file to create a runtime.Object
+ obj, err := utils.DecodeYAML(yamlFilePath, nil)
+ if err != nil {
+ return "", pkgerrors.Wrap(err, "Decode deployment object error")
+ }
+
+ //Convert the runtime.Object to an unstructured Object
+ unstruct := &unstructured.Unstructured{}
+ err = scheme.Scheme.Convert(obj, unstruct, nil)
+ if err != nil {
+ return "", pkgerrors.Wrap(err, "Converting to unstructured object")
+ }
+
+ dynClient := client.GetDynamicClient()
+ mapper := client.GetMapper()
+
+ gvk := unstruct.GroupVersionKind()
+ mapping, err := mapper.RESTMapping(schema.GroupKind{Group: gvk.Group, Kind: gvk.Kind}, gvk.Version)
+ if err != nil {
+ return "", pkgerrors.Wrap(err, "Mapping kind to resource error")
+ }
+
+ gvr := mapping.Resource
+
+ createdObj, err := dynClient.Resource(gvr).Namespace(namespace).Create(unstruct, metav1.CreateOptions{})
+ if err != nil {
+ return "", pkgerrors.Wrap(err, "Create object error")
+ }
+
+ return createdObj.GetName(), nil
+}
+
+// Delete an existing deployment hosted in a specific Kubernetes cluster
+func (g genericPlugin) Delete(kind string, name string, namespace string, client *app.KubernetesClient) error {
+ if namespace == "" {
+ namespace = "default"
+ }
+
+ deletePolicy := metav1.DeletePropagationForeground
+ opts := &metav1.DeleteOptions{
+ PropagationPolicy: &deletePolicy,
+ }
+
+ dynClient := client.GetDynamicClient()
+ gvr, ok := kindToGVRMap[kind]
+ if !ok {
+ return pkgerrors.New("GVR not found for: " + kind)
+ }
+
+ log.Printf("Using gvr: %s, %s, %s", gvr.Group, gvr.Version, gvr.Resource)
+
+ err := dynClient.Resource(gvr).Namespace(namespace).Delete(name, opts)
+ if err != nil {
+ return pkgerrors.Wrap(err, "Delete object error")
+ }
+
+ return nil
+}
+
+// ExportedVariable is what we will look for when calling the generic plugin
+var ExportedVariable genericPlugin