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kubernetes.go
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kubernetes.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package debug
import (
"context"
"encoding/json"
"fmt"
"github.com/spf13/cobra"
"google.golang.org/protobuf/encoding/prototext"
appsv1 "k8s.io/api/apps/v1"
batchv1 "k8s.io/api/batch/v1"
v1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
rbacv1 "k8s.io/api/rbac/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/rest"
"namespacelabs.dev/foundation/internal/cli/fncobra"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/runtime/kubernetes"
"namespacelabs.dev/foundation/std/cfg"
"namespacelabs.dev/foundation/std/module"
)
func newKubernetesCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "kubernetes",
}
envBound := "dev"
systemInfo := &cobra.Command{
Use: "system-info",
Args: cobra.NoArgs,
RunE: fncobra.RunE(func(ctx context.Context, args []string) error {
root, err := module.FindRoot(ctx, ".")
if err != nil {
return err
}
env, err := cfg.LoadContext(root, envBound)
if err != nil {
return err
}
k, err := kubernetes.ConnectToCluster(ctx, env.Configuration())
if err != nil {
return err
}
sysInfo, err := k.SystemInfo(ctx)
if err != nil {
return err
}
fmt.Fprintln(console.Stdout(ctx), prototext.Format(sysInfo))
return nil
}),
}
systemInfo.Flags().StringVar(&envBound, "env", envBound, "If specified, produce a env-bound sealed schema.")
cmd.AddCommand(systemInfo)
cmd.AddCommand(newObservePodsCmd())
return cmd
}
func newObservePodsCmd() *cobra.Command {
var (
envBound = "dev"
group = ""
version = "v1"
resource = "pods"
)
cmd := &cobra.Command{
Use: "observe",
Args: cobra.NoArgs,
RunE: fncobra.RunE(func(ctx context.Context, args []string) error {
root, err := module.FindRoot(ctx, ".")
if err != nil {
return err
}
env, err := cfg.LoadContext(root, envBound)
if err != nil {
return err
}
k, err := kubernetes.ConnectToCluster(ctx, env.Configuration())
if err != nil {
return err
}
return listAndWatch(ctx, k.RESTConfig(), schema.GroupVersionResource{
Group: group,
Version: version,
Resource: resource,
})
}),
}
cmd.Flags().StringVar(&envBound, "env", envBound, "If specified, produce a env-bound sealed schema.")
cmd.Flags().StringVar(&group, "group", group, "G out of GVR")
cmd.Flags().StringVar(&version, "version", version, "V out of GVR")
cmd.Flags().StringVar(&resource, "resource", resource, "R out of GVR")
return cmd
}
type X interface {
GetNamespace() string
GetName() string
GetResourceVersion() string
}
func listAndWatch(ctx context.Context, cfg *rest.Config, resource schema.GroupVersionResource) error {
r := prepareScheme()
_, client, err := MakeGroupVersionBasedClientAndConfig(ctx, r, cfg, resource.GroupVersion())
if err != nil {
return err
}
parameterCodec := runtime.NewParameterCodec(r)
var opts metav1.ListOptions
opts.Limit = 20
onEvent := func(event watch.EventType, pod X) {
b, _ := json.Marshal(pod)
fmt.Fprintf(console.Stdout(ctx), "%s [%s/%s] %s [%d bytes]\n", event, pod.GetNamespace(), pod.GetName(), pod.GetResourceVersion(), len(b))
}
var wopts metav1.ListOptions
wopts.Watch = true
for {
var result unstructured.UnstructuredList
if err := client.Get().Resource(resource.Resource).VersionedParams(&opts, parameterCodec).Do(ctx).Into(&result); err != nil {
return err
}
for _, x := range result.Items {
onEvent(watch.Added, &x)
}
wopts.ResourceVersion = result.GetResourceVersion()
if result.GetContinue() == "" {
break
} else {
opts.Continue = result.GetContinue()
}
}
fmt.Fprintf(console.Stdout(ctx), "starting watch\n")
wintf, err := client.Get().
Resource(resource.Resource).
VersionedParams(&wopts, parameterCodec).
Watch(ctx)
if err != nil {
return err
}
defer wintf.Stop()
ch := wintf.ResultChan()
for {
select {
case <-ctx.Done():
return ctx.Err()
case x := <-ch:
fmt.Fprintf(console.Debug(ctx), "event: %v\n", x)
switch x.Type {
case watch.Added, watch.Modified, watch.Deleted:
if y, ok := x.Object.(X); ok {
onEvent(x.Type, y)
} else {
fmt.Fprintf(console.Stdout(ctx), "failed to handle: %s: %v\n", x.Type, x.Object)
}
case watch.Bookmark:
case watch.Error:
}
}
}
}
func MakeGroupVersionBasedClientAndConfig(ctx context.Context, r *runtime.Scheme, original *rest.Config, gv schema.GroupVersion) (*rest.Config, rest.Interface, error) {
config := copyAndSetDefaults(*original, r, gv)
client, err := rest.RESTClientFor(config)
return config, client, err
}
func copyAndSetDefaults(config rest.Config, r *runtime.Scheme, gv schema.GroupVersion) *rest.Config {
config.GroupVersion = &gv
if gv.Group == "" {
config.APIPath = "/api"
} else {
config.APIPath = "/apis"
}
// config.NegotiatedSerializer = unstructuredscheme.NewUnstructuredNegotiatedSerializer()
// config.NegotiatedSerializer = scheme.Codecs.WithoutConversion()
config.NegotiatedSerializer = serializer.NewCodecFactory(r).WithoutConversion()
if config.UserAgent == "" {
config.UserAgent = rest.DefaultKubernetesUserAgent()
}
return &config
}
func prepareScheme() *runtime.Scheme {
r := runtime.NewScheme()
for _, add := range []func(*runtime.Scheme) error{
metav1.AddMetaToScheme, v1.AddToScheme, appsv1.AddToScheme,
networkingv1.AddToScheme, batchv1.AddToScheme, rbacv1.AddToScheme,
apiextensionsv1.AddToScheme,
} {
if err := add(r); err != nil {
panic(err)
}
}
return r
}