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client.go
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client.go
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// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 2023 Steadybit GmbH
package containerd
import (
"context"
"fmt"
"github.com/containerd/containerd"
"github.com/containerd/containerd/errdefs"
"github.com/rs/zerolog/log"
"github.com/steadybit/extension-container/extcontainer/container/types"
"strings"
"syscall"
"time"
)
type client struct {
containerd *containerd.Client
}
func (c *client) Socket() string {
return c.containerd.Conn().Target()
}
func New(socket string, namespace string) (types.Client, error) {
containerdClient, err := containerd.New(socket, containerd.WithDefaultNamespace(namespace))
if err != nil {
return nil, fmt.Errorf("failed to create containerd client: %w", err)
}
return &client{containerdClient}, nil
}
func (c *client) Runtime() types.Runtime {
return types.RuntimeContainerd
}
func (c *client) List(ctx context.Context) ([]types.Container, error) {
containers, err := c.containerd.Containers(ctx)
if err != nil {
return nil, fmt.Errorf("failed to list containers: %w", err)
}
result := make([]types.Container, 0, len(containers))
for _, container := range containers {
if status, err := getStatus(ctx, container); status.Status != containerd.Running &&
status.Status != containerd.Paused && status.Status != containerd.Pausing {
if err != nil && !errdefs.IsNotFound(err) {
log.Warn().Err(err).Msg("Failed to get status for container")
}
continue
}
if mapped, err := toContainer(ctx, container); err == nil {
result = append(result, mapped)
}
if err != nil {
log.Warn().Err(err).Msg("Failed to get info for container")
}
}
return result, nil
}
func getStatus(ctx context.Context, container containerd.Container) (containerd.Status, error) {
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
task, err := container.Task(ctx, nil)
if err != nil {
return containerd.Status{}, err
}
return task.Status(ctx)
}
func (c *client) GetPid(ctx context.Context, containerId string) (int, error) {
container, err := c.containerd.LoadContainer(ctx, containerId)
if err != nil {
return 0, fmt.Errorf("failed to load container: %w", err)
}
task, err := container.Task(ctx, nil)
if err != nil {
return 0, fmt.Errorf("failed to load task for container: %w", err)
}
return int(task.Pid()), nil
}
func toContainer(ctx context.Context, container containerd.Container) (*Container, error) {
info, err := container.Info(ctx)
if err != nil {
return nil, err
}
return &Container{info}, nil
}
func (c *client) Pause(ctx context.Context, id string) error {
container, err := c.containerd.LoadContainer(ctx, id)
if err != nil {
return fmt.Errorf("failed to load container %s: %w", id, err)
}
task, err := container.Task(ctx, nil)
if err != nil {
if strings.Contains(err.Error(), "no running task found") {
return fmt.Errorf("couldn't pause container as container %s wasn't running: %w", id, err)
}
return fmt.Errorf("failed to load task for container %s: %w", id, err)
}
return task.Pause(ctx)
}
func (c *client) Unpause(ctx context.Context, id string) error {
container, err := c.containerd.LoadContainer(ctx, id)
if err != nil {
return fmt.Errorf("failed to load container %s: %w", id, err)
}
task, err := container.Task(ctx, nil)
if err != nil {
if strings.Contains(err.Error(), "no running task found") {
return fmt.Errorf("couldn't unpause container as container %s wasn't running: %w", id, err)
}
return fmt.Errorf("failed to load task for container %s: %w", id, err)
}
return task.Resume(ctx)
}
func (c *client) Stop(ctx context.Context, id string, graceful bool) error {
container, err := c.containerd.LoadContainer(ctx, id)
if err != nil {
return fmt.Errorf("failed to load container %s: %w", id, err)
}
task, err := container.Task(ctx, nil)
if err != nil {
if strings.Contains(err.Error(), "no running task found") {
return fmt.Errorf("couldn't stop container as container %s wasn't running: %w", id, err)
}
return fmt.Errorf("failed to load task for container %s: %w", id, err)
}
if graceful {
log.Info().Msgf("Sending SIGTERM to container %s", id)
err = task.Kill(ctx, syscall.SIGTERM)
if err != nil {
return fmt.Errorf("failed to stop container %s: %w", id, err)
}
waitChannel, err := task.Wait(ctx)
if err != nil {
return fmt.Errorf("failed to wait for container stop %s: %w", id, err)
}
select {
case exitStatus := <-waitChannel:
if exitStatus.Error() != nil {
return fmt.Errorf("failed to stop container %s during grace period : %w", id, exitStatus.Error())
}
log.Info().Str("containerId", id).Msgf("container stopped gracefully.")
return nil
case <-time.After(10 * time.Second):
log.Info().Str("containerId", id).Msgf("container did not stop gracefully.")
}
}
log.Info().Str("containerId", id).Msgf("Sending SIGKILL to container")
err = task.Kill(ctx, syscall.SIGKILL)
if err != nil {
return fmt.Errorf("failed to kill container %s: %w", id, err)
}
return nil
}
func (c *client) Version(ctx context.Context) (string, error) {
version, err := c.containerd.Version(ctx)
if err != nil {
return "", err
}
return version.Version, nil
}
func (c *client) Close() error {
return c.containerd.Close()
}