77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
package cluster
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/client-go/kubernetes/scheme"
|
|
"k8s.io/client-go/tools/remotecommand"
|
|
|
|
"github.com/zalando/postgres-operator/pkg/spec"
|
|
"github.com/zalando/postgres-operator/pkg/util/constants"
|
|
)
|
|
|
|
//ExecCommand executes arbitrary command inside the pod
|
|
func (c *Cluster) ExecCommand(podName *spec.NamespacedName, command ...string) (string, error) {
|
|
c.setProcessName("executing command %q", strings.Join(command, " "))
|
|
|
|
var (
|
|
execOut bytes.Buffer
|
|
execErr bytes.Buffer
|
|
)
|
|
|
|
pod, err := c.KubeClient.Pods(podName.Namespace).Get(podName.Name, metav1.GetOptions{})
|
|
if err != nil {
|
|
return "", fmt.Errorf("could not get pod info: %v", err)
|
|
}
|
|
|
|
// iterate through all containers looking for the one running PostgreSQL.
|
|
targetContainer := -1
|
|
for i, cr := range pod.Spec.Containers {
|
|
if cr.Name == constants.PostgresContainerName {
|
|
targetContainer = i
|
|
break
|
|
}
|
|
}
|
|
|
|
if targetContainer < 0 {
|
|
return "", fmt.Errorf("could not find %s container to exec to", constants.PostgresContainerName)
|
|
}
|
|
|
|
req := c.KubeClient.RESTClient.Post().
|
|
Resource("pods").
|
|
Name(podName.Name).
|
|
Namespace(podName.Namespace).
|
|
SubResource("exec")
|
|
req.VersionedParams(&v1.PodExecOptions{
|
|
Container: pod.Spec.Containers[targetContainer].Name,
|
|
Command: command,
|
|
Stdout: true,
|
|
Stderr: true,
|
|
}, scheme.ParameterCodec)
|
|
|
|
exec, err := remotecommand.NewSPDYExecutor(c.RestConfig, "POST", req.URL())
|
|
if err != nil {
|
|
return "", fmt.Errorf("failed to init executor: %v", err)
|
|
}
|
|
|
|
err = exec.Stream(remotecommand.StreamOptions{
|
|
Stdout: &execOut,
|
|
Stderr: &execErr,
|
|
Tty: false,
|
|
})
|
|
|
|
if err != nil {
|
|
return "", fmt.Errorf("could not execute: %v", err)
|
|
}
|
|
|
|
if execErr.Len() > 0 {
|
|
return "", fmt.Errorf("stderr: %v", execErr.String())
|
|
}
|
|
|
|
return execOut.String(), nil
|
|
}
|