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/*
* Copyright 2019 Intel Corporation, Inc
*
* 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 plugin
import (
"log"
"strings"
utils "k8splugin/internal"
"k8splugin/internal/helm"
pkgerrors "github.com/pkg/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
)
// KubernetesConnector is an interface that is expected to be implemented
// by any code that calls the plugin framework functions.
// It implements methods that are needed by the plugins to get Kubernetes
// clients and other information needed to interface with Kubernetes
type KubernetesConnector interface {
//GetMapper returns the RESTMapper that was created for this client
GetMapper() meta.RESTMapper
//GetDynamicClient returns the dynamic client that is needed for
//unstructured REST calls to the apiserver
GetDynamicClient() dynamic.Interface
// GetStandardClient returns the standard client that can be used to handle
// standard kubernetes kinds
GetStandardClient() kubernetes.Interface
}
// Reference is the interface that is implemented
type Reference interface {
//Create a kubernetes resource described by the yaml in yamlFilePath
Create(yamlFilePath string, namespace string, client KubernetesConnector) (string, error)
//Get a kubernetes resource based on the groupVersionKind and resourceName provided in resource
Get(resource helm.KubernetesResource, namespace string, client KubernetesConnector) (string, error)
//List all resources of the specified GroupVersionKind in the given namespace
//If gvk is empty, the plugin will return all supported objects in the namespace
List(gvk schema.GroupVersionKind, namespace string, client KubernetesConnector) ([]helm.KubernetesResource, error)
//Delete a kubernetes resource described in the provided namespace
Delete(resource helm.KubernetesResource, namespace string, client KubernetesConnector) error
}
// GetPluginByKind returns a plugin by the kind name
// If plugin does not exist, it will return the generic plugin
// TODO: Change this once we have a plugin registration mechanism
func GetPluginByKind(kind string) (Reference, error) {
typePlugin, ok := utils.LoadedPlugins[strings.ToLower(kind)]
if !ok {
log.Println("No plugin for kind " + kind + " found. Using generic Plugin")
typePlugin, ok = utils.LoadedPlugins["generic"]
if !ok {
return nil, pkgerrors.New("No generic plugin found")
}
}
symbol, err := typePlugin.Lookup("ExportedVariable")
if err != nil {
return nil, pkgerrors.Wrap(err, "No ExportedVariable symbol found")
}
//Assert if it implements the PluginReference interface
pluginImpl, ok := symbol.(Reference)
if !ok {
return nil, pkgerrors.New("ExportedVariable does not implement plugins.Reference interface type")
}
return pluginImpl, nil
}
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