Add kubectl plugin

cmd/plugin/request/request.go

@@ -0,0 +1,209 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+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 request
+
+import (
+	"bytes"
+	"fmt"
+	apiv1 "k8s.io/api/core/v1"
+	"k8s.io/api/extensions/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/client-go/kubernetes/scheme"
+	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
+	extensions "k8s.io/client-go/kubernetes/typed/extensions/v1beta1"
+	"k8s.io/client-go/tools/remotecommand"
+	"k8s.io/ingress-nginx/cmd/plugin/util"
+)
+
+const (
+	ingressPodName     = "nginx-ingress-controller"
+	ingressServiceName = "ingress-nginx"
+)
+
+// NamedPodExec finds a pod with the given name, executes a command inside it, and returns stdout
+func NamedPodExec(flags *genericclioptions.ConfigFlags, podName string, cmd []string) (string, error) {
+	allPods, err := getPods(flags)
+	if err != nil {
+		return "", err
+	}
+
+	for _, pod := range allPods {
+		if pod.Name == podName {
+			return podExec(flags, &pod, cmd)
+		}
+	}
+
+	return "", fmt.Errorf("Pod %v not found in namespace %v", podName, util.GetNamespace(flags))
+}
+
+// IngressPodExec finds an ingress-nginx pod in the given namespace, executes a command inside it, and returns stdout
+func IngressPodExec(flags *genericclioptions.ConfigFlags, cmd []string) (string, error) {
+	ings, err := getIngressPods(flags)
+	if err != nil {
+		return "", err
+	}
+
+	if len(ings) == 0 {
+		return "", fmt.Errorf("No ingress-nginx pods found in namespace %v", util.GetNamespace(flags))
+	}
+
+	return podExec(flags, &ings[0], cmd)
+}
+
+func podExec(flags *genericclioptions.ConfigFlags, pod *apiv1.Pod, cmd []string) (string, error) {
+	config, err := flags.ToRESTConfig()
+	if err != nil {
+		return "", err
+	}
+
+	client, err := corev1.NewForConfig(config)
+	if err != nil {
+		return "", err
+	}
+
+	namespace, _, err := flags.ToRawKubeConfigLoader().Namespace()
+	if err != nil {
+		return "", err
+	}
+
+	restClient := client.RESTClient()
+
+	req := restClient.Post().
+		Resource("pods").
+		Name(pod.Name).
+		Namespace(namespace).
+		SubResource("exec").
+		Param("container", ingressPodName)
+
+	req.VersionedParams(&apiv1.PodExecOptions{
+		Container: ingressPodName,
+		Command:   cmd,
+		Stdin:     false,
+		Stdout:    true,
+		Stderr:    false,
+		TTY:       false,
+	}, scheme.ParameterCodec)
+
+	exec, err := remotecommand.NewSPDYExecutor(config, "POST", req.URL())
+
+	if err != nil {
+		return "", err
+	}
+
+	stdout := bytes.NewBuffer(make([]byte, 0))
+	err = exec.Stream(remotecommand.StreamOptions{
+		Stdout: stdout,
+	})
+
+	return stdout.String(), err
+}
+
+func getIngressPods(flags *genericclioptions.ConfigFlags) ([]apiv1.Pod, error) {
+	pods, err := getPods(flags)
+	if err != nil {
+		return make([]apiv1.Pod, 0), err
+	}
+
+	ingressPods := make([]apiv1.Pod, 0)
+	for _, pod := range pods {
+		if pod.Spec.Containers[0].Name == ingressPodName {
+			ingressPods = append(ingressPods, pod)
+		}
+	}
+
+	return ingressPods, nil
+}
+
+func getPods(flags *genericclioptions.ConfigFlags) ([]apiv1.Pod, error) {
+	namespace := util.GetNamespace(flags)
+
+	rawConfig, err := flags.ToRESTConfig()
+	if err != nil {
+		return make([]apiv1.Pod, 0), err
+	}
+
+	api, err := corev1.NewForConfig(rawConfig)
+	if err != nil {
+		return make([]apiv1.Pod, 0), err
+	}
+
+	pods, err := api.Pods(namespace).List(metav1.ListOptions{})
+	if err != nil {
+		return make([]apiv1.Pod, 0), err
+	}
+
+	return pods.Items, nil
+}
+
+// GetIngressDefinitions returns an array of Ingress resource definitions
+func GetIngressDefinitions(flags *genericclioptions.ConfigFlags, namespace string) ([]v1beta1.Ingress, error) {
+	rawConfig, err := flags.ToRESTConfig()
+	if err != nil {
+		return make([]v1beta1.Ingress, 0), err
+	}
+
+	api, err := extensions.NewForConfig(rawConfig)
+	if err != nil {
+		return make([]v1beta1.Ingress, 0), err
+	}
+
+	pods, err := api.Ingresses(namespace).List(metav1.ListOptions{})
+	if err != nil {
+		return make([]v1beta1.Ingress, 0), err
+	}
+
+	return pods.Items, nil
+}
+
+// GetIngressService finds and returns the ingress-nginx service definition
+func GetIngressService(flags *genericclioptions.ConfigFlags) (apiv1.Service, error) {
+	services, err := getServices(flags)
+	if err != nil {
+		return apiv1.Service{}, err
+	}
+
+	for _, svc := range services {
+		if svc.Name == ingressServiceName {
+			return svc, nil
+		}
+	}
+
+	return apiv1.Service{}, fmt.Errorf("Could not find service %v in namespace %v", ingressServiceName, util.GetNamespace(flags))
+}
+
+func getServices(flags *genericclioptions.ConfigFlags) ([]apiv1.Service, error) {
+	namespace := util.GetNamespace(flags)
+
+	rawConfig, err := flags.ToRESTConfig()
+	if err != nil {
+		return make([]apiv1.Service, 0), err
+	}
+
+	api, err := corev1.NewForConfig(rawConfig)
+	if err != nil {
+		return make([]apiv1.Service, 0), err
+	}
+
+	services, err := api.Services(namespace).List(metav1.ListOptions{})
+	if err != nil {
+		return make([]apiv1.Service, 0), err
+	}
+
+	return services.Items, nil
+
+}