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pods.go
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pods.go
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package tester
import (
"bytes"
"context"
"fmt"
"net"
"strings"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
"sigs.k8s.io/e2e-framework/pkg/envconf"
)
// Pods enables some basic operations in cluster pods (e.g. searching, executing commands...)
type Pods struct {
restConfig *rest.Config
client *kubernetes.Clientset
}
func NewPods(cfg *envconf.Config) (*Pods, error) {
kclient, err := kubernetes.NewForConfig(cfg.Client().RESTConfig())
if err != nil {
return nil, err
}
return &Pods{
restConfig: cfg.Client().RESTConfig(),
client: kclient,
}, nil
}
func (p *Pods) MACAddress(
ctx context.Context, namespace, name, iface string,
) (net.HardwareAddr, error) {
mac, errStr, err := p.Execute(ctx, namespace, name, "cat", "/sys/class/net/"+iface+"/address")
if err != nil {
return nil, fmt.Errorf("executing command: %w", err)
}
if errStr != "" {
return nil, fmt.Errorf("unexpected stderr: %s", errStr)
}
hwaddr, err := net.ParseMAC(strings.Trim(mac, " \n\r"))
if err != nil {
return nil, fmt.Errorf("can't parse address %q: %w", mac, err)
}
return hwaddr, nil
}
func (p *Pods) Execute(ctx context.Context, namespace, name string, command ...string) (string, string, error) {
pod, err := p.client.CoreV1().Pods(namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return "", "", fmt.Errorf("getting pod: %w", err)
}
request := p.client.CoreV1().RESTClient().Post().Namespace(pod.Namespace).
Resource("pods").Name(pod.Name).
SubResource("exec").VersionedParams(&v1.PodExecOptions{
Command: command,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: true,
}, scheme.ParameterCodec)
buf := &bytes.Buffer{}
errBuf := &bytes.Buffer{}
exec, err := remotecommand.NewSPDYExecutor(p.restConfig, "POST", request.URL())
if err != nil {
return "", "", fmt.Errorf("instantiating executor: %w", err)
}
if err := exec.Stream(remotecommand.StreamOptions{
Stdout: buf,
Stderr: errBuf,
}); err != nil {
return "", "", fmt.Errorf("executing command: %w", err)
}
return buf.String(), errBuf.String(), nil
}