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Initial crossplane top command setup
Signed-off-by: Piotr Zaniewski <piotr@upbound.io>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| Copyright 2023 The Crossplane 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 top contains the top command. | ||
| package top | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/alecthomas/kong" | ||
| "k8s.io/apimachinery/pkg/api/resource" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "k8s.io/metrics/pkg/client/clientset/versioned" | ||
|
|
||
| "github.com/crossplane/crossplane-runtime/pkg/logging" | ||
| ) | ||
|
|
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| // TODO:(piotr1215) implement kubeconfig using ctrl "sigs.k8s.io/controller-runtime" | ||
| func getKubeConfig() (string, error) { | ||
| kubeconfig := os.Getenv("KUBECONFIG") | ||
| if kubeconfig != "" { | ||
| return kubeconfig, nil | ||
| } | ||
| home, err := os.UserHomeDir() | ||
| if err != nil { | ||
| return "", fmt.Errorf("could not get user home directory: %w", err) | ||
| } | ||
| return filepath.Join(home, ".kube", "config"), nil | ||
| } | ||
|
|
||
| // Cmd represents the top command. | ||
| type Cmd struct{} | ||
|
|
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| // Help returns help instructions for the top command. | ||
| func (c *Cmd) Help() string { | ||
| return `Usage: crossplane top` | ||
| } | ||
|
|
||
| // Run runs the top command. | ||
| func (c *Cmd) Run(_ *kong.Context, logger logging.Logger) error { //nolint:gocyclo // TODO:(piotr1215) refactor to lower cyclomatic complexity | ||
| // TODO:(piotr1215) add logging in key places | ||
| logger = logger.WithValues("cmd", "top") | ||
|
|
||
| // Build the config from the kubeconfig path | ||
| kubeconfig, err := getKubeConfig() | ||
| if err != nil { | ||
| // TODO:(piotr1215) use crossplane-runtime error package | ||
| return fmt.Errorf("failed to get kubeconfig: %w", err) | ||
| } | ||
| logger.Debug("Found kubeconfig") | ||
|
|
||
| config, err := clientcmd.BuildConfigFromFlags("", kubeconfig) | ||
| if err != nil { | ||
| return fmt.Errorf("could not build config from flags: %w", err) | ||
| } | ||
|
|
||
| // Create the clientset for Kubernetes | ||
| k8sClientset, err := kubernetes.NewForConfig(config) | ||
| if err != nil { | ||
| return fmt.Errorf("could not create the clientset for Kubernetes: %w", err) | ||
| } | ||
|
|
||
| // Create the clientset for Metrics | ||
| metricsClientset, err := versioned.NewForConfig(config) | ||
| if err != nil { | ||
| return fmt.Errorf("could not create the clientset for Metrics: %w", err) | ||
| } | ||
|
|
||
| // Fetch all pods from all namespaces in case of Crossplane pods being installed elswhere | ||
| pods, err := k8sClientset.CoreV1().Pods(metav1.NamespaceAll).List(context.TODO(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| return fmt.Errorf("could not fetch all pods from all namespaces: %w", err) | ||
| } | ||
|
|
||
| // Loop through pods and print metrics | ||
| for _, pod := range pods.Items { | ||
| for labelKey := range pod.GetLabels() { | ||
| if strings.HasPrefix(labelKey, "pkg.crossplane.io/provider") || strings.HasPrefix(labelKey, "pkg.crossplane.io/function") { | ||
| podMetrics, err := metricsClientset.MetricsV1beta1().PodMetricses(pod.Namespace).Get(context.TODO(), pod.Name, metav1.GetOptions{}) | ||
| if err != nil { | ||
| fmt.Printf("Error getting metrics for pod %s: %v\n", pod.Name, err) | ||
| continue | ||
| } | ||
|
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||
| for _, container := range podMetrics.Containers { | ||
| cpuUsage := container.Usage.Cpu().ScaledValue(resource.Milli) | ||
| memoryUsage := fmt.Sprintf("%dMi", container.Usage.Memory().ScaledValue(resource.Mega)) | ||
| fmt.Printf("%-20s %-55s %-12d %-15s\n", pod.Namespace, pod.Name, cpuUsage, memoryUsage) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } |
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