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containerd.go
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containerd.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Package containerd implements containers.Inspector via containerd API
package containerd
import (
"context"
"errors"
"fmt"
"path"
"strings"
"syscall"
"time"
v1 "github.com/containerd/cgroups/stats/v1"
"github.com/containerd/containerd"
tasks "github.com/containerd/containerd/api/services/tasks/v1"
"github.com/containerd/containerd/errdefs"
v2 "github.com/containerd/containerd/metrics/types/v2"
"github.com/containerd/containerd/namespaces"
"github.com/containerd/typeurl"
"github.com/hashicorp/go-multierror"
ctrs "github.com/siderolabs/talos/internal/pkg/containers"
"github.com/siderolabs/talos/pkg/machinery/constants"
)
type inspector struct {
client *containerd.Client
//nolint:containedctx
nsctx context.Context
}
type inspectorOptions struct {
containerdAddress string
}
// Option configures containerd Inspector.
type Option func(*inspectorOptions)
// WithContainerdAddress configures containerd address to use.
func WithContainerdAddress(address string) Option {
return func(o *inspectorOptions) {
o.containerdAddress = address
}
}
// NewInspector builds new Inspector instance in specified namespace.
func NewInspector(ctx context.Context, namespace string, options ...Option) (ctrs.Inspector, error) {
var err error
opt := inspectorOptions{
containerdAddress: constants.CRIContainerdAddress,
}
for _, o := range options {
o(&opt)
}
i := inspector{}
i.client, err = containerd.New(opt.containerdAddress)
if err != nil {
return nil, err
}
i.nsctx = namespaces.WithNamespace(ctx, namespace)
return &i, nil
}
// Close frees associated resources.
func (i *inspector) Close() error {
return i.client.Close()
}
// Images returns a hash of image digest -> name.
func (i *inspector) Images() (map[string]string, error) {
images, err := i.client.ListImages(i.nsctx, "")
if err != nil {
return nil, err
}
// create a map[sha]name for easier lookups later
imageList := make(map[string]string, len(images))
for _, image := range images {
if strings.HasPrefix(image.Name(), "sha256:") {
continue
}
imageList[image.Target().Digest.String()] = image.Name()
}
return imageList, nil
}
//nolint:gocyclo,cyclop
func (i *inspector) containerInfo(
cntr containerd.Container,
imageList map[string]string,
singleLookup bool,
) (*ctrs.Container, error) {
cp := &ctrs.Container{}
info, err := cntr.Info(i.nsctx)
if err != nil {
return nil, fmt.Errorf("error getting container info for %q: %w", cntr.ID(), err)
}
spec, err := cntr.Spec(i.nsctx)
if err != nil {
return nil, fmt.Errorf("error getting container spec for %q: %w", cntr.ID(), err)
}
img, err := cntr.Image(i.nsctx)
if err != nil {
if !errdefs.IsNotFound(err) {
return nil, fmt.Errorf("error getting container image for %q: %w", cntr.ID(), err)
}
}
task, err := cntr.Task(i.nsctx, nil)
if err != nil {
if errdefs.IsNotFound(err) {
// running task not found, skip container
return nil, nil
}
return nil, fmt.Errorf("error getting container task for %q: %w", cntr.ID(), err)
}
status, err := task.Status(i.nsctx)
if err != nil {
return nil, fmt.Errorf("error getting task status for %q: %w", cntr.ID(), err)
}
cp.Inspector = i
cp.ID = cntr.ID()
cp.Name = cntr.ID()
cp.Display = cntr.ID()
cp.RestartCount = "0"
if img != nil {
cp.Digest = img.Target().Digest.String()
}
cp.Image = cp.Digest
if imageList != nil {
if resolved, ok := imageList[cp.Image]; ok {
cp.Image = resolved
}
}
cp.Pid = task.Pid()
cp.Status = strings.ToUpper(string(status.Status))
var (
cname, cns string
ok bool
)
if cname, ok = info.Labels["io.kubernetes.pod.name"]; ok {
if cns, ok = info.Labels["io.kubernetes.pod.namespace"]; ok {
cp.Display = path.Join(cns, cname)
}
}
if status.Status == containerd.Running {
metrics, err := task.Metrics(i.nsctx)
if err != nil {
return nil, fmt.Errorf("error pulling metrics for %q: %w", cntr.ID(), err)
}
anydata, err := typeurl.UnmarshalAny(metrics.Data)
if err != nil {
return nil, fmt.Errorf("error unmarshalling metrics for %q: %w", cntr.ID(), err)
}
cp.Metrics = &ctrs.ContainerMetrics{}
switch data := anydata.(type) {
case *v1.Metrics:
mem := data.Memory
if mem != nil && mem.Usage != nil {
if mem.TotalInactiveFile < mem.Usage.Usage {
cp.Metrics.MemoryUsage = mem.Usage.Usage - mem.TotalInactiveFile
}
}
cpu := data.CPU
if cpu != nil && cpu.Usage != nil {
cp.Metrics.CPUUsage = cpu.Usage.Total
}
case *v2.Metrics:
mem := data.Memory
if mem != nil {
cp.Metrics.MemoryUsage = mem.Usage
}
cpu := data.CPU
if cpu != nil {
cp.Metrics.CPUUsage = cpu.UsageUsec * uint64(time.Microsecond/time.Nanosecond) // convert to nsec
}
default:
return nil, errors.New("failed to convert metric data to cgroups Metrics")
}
}
// Save off an identifier for the pod
// this is typically the container name (non-k8s namespace)
// or will be k8s namespace"/"k8s pod name":"container name
cp.PodName = cp.Display
// Pull restart count
// TODO: this doesn't work as CRI doesn't publish this to containerd annotations
if _, ok := spec.Annotations["io.kubernetes.container.restartCount"]; ok {
cp.RestartCount = spec.Annotations["io.kubernetes.container.restartCount"]
}
// Typically on the 'infrastructure' container, aka k8s.gcr.io/pause
if _, ok := spec.Annotations["io.kubernetes.cri.sandbox-log-directory"]; ok {
cp.Sandbox = spec.Annotations["io.kubernetes.cri.sandbox-log-directory"]
cp.IsPodSandbox = true
} else if singleLookup && cns != "" && cname != "" {
// try to find matching infrastructure container and pull sandbox from it
query := fmt.Sprintf(
"labels.\"io.kubernetes.pod.namespace\"==%q,labels.\"io.kubernetes.pod.name\"==%q",
cns,
cname,
)
infraContainers, err := i.client.Containers(i.nsctx, query)
if err == nil {
for j := range infraContainers {
if infraSpec, err := infraContainers[j].Spec(i.nsctx); err == nil {
if spec.Annotations["io.kubernetes.sandbox-id"] != infraSpec.Annotations["io.kubernetes.sandbox-id"] {
continue
}
if sandbox, found := infraSpec.Annotations["io.kubernetes.cri.sandbox-log-directory"]; found {
cp.Sandbox = sandbox
break
}
}
}
}
}
// Typically on actual application containers inside the pod/sandbox
if _, ok := info.Labels["io.kubernetes.container.name"]; ok {
cp.Name = info.Labels["io.kubernetes.container.name"]
cp.Display = cp.Display + ":" + info.Labels["io.kubernetes.container.name"]
}
return cp, nil
}
// Container returns info about a single container.
//
// If container is not found, Container returns nil
//
//nolint:gocyclo
func (i *inspector) Container(id string) (*ctrs.Container, error) {
var (
query string
skipWithK8sName bool
)
// if id looks like k8s one, ns/pod:container, parse it and build query
slashIdx := strings.Index(id, "/")
if slashIdx > 0 {
name := ""
namespace, pod := id[:slashIdx], id[slashIdx+1:]
semicolonIdx := strings.LastIndex(pod, ":")
if semicolonIdx > 0 {
name = pod[semicolonIdx+1:]
pod = pod[:semicolonIdx]
}
query = fmt.Sprintf(
"labels.\"io.kubernetes.pod.namespace\"==%q,labels.\"io.kubernetes.pod.name\"==%q",
namespace,
pod,
)
if name != "" {
query += fmt.Sprintf(",labels.\"io.kubernetes.container.name\"==%q", name)
} else {
skipWithK8sName = true
}
} else {
query = fmt.Sprintf("id==%q", id)
}
containers, err := i.client.Containers(i.nsctx, query)
if err != nil {
return nil, err
}
if len(containers) == 0 {
return nil, nil
}
var cntr *ctrs.Container
for j := range containers {
if skipWithK8sName {
var labels map[string]string
if labels, err = containers[j].Labels(i.nsctx); err == nil {
if _, found := labels["io.kubernetes.container.name"]; found {
continue
}
}
}
cntr, err = i.containerInfo(containers[j], nil, true)
if err == nil && cntr != nil {
break
}
}
return cntr, err
}
// Pods collects information about running pods & containers.
//
//nolint:gocyclo
func (i *inspector) Pods() ([]*ctrs.Pod, error) {
imageList, err := i.Images()
if err != nil {
return nil, err
}
containers, err := i.client.Containers(i.nsctx)
if err != nil {
return nil, err
}
var (
multiErr *multierror.Error
pods []*ctrs.Pod
)
for _, cntr := range containers {
cp, err := i.containerInfo(cntr, imageList, false)
if err != nil {
multiErr = multierror.Append(multiErr, err)
continue
}
if cp == nil {
// not running container
continue
}
// Figure out if we need to create a new pod or append
// to an existing pod
// Also set pod sandbox ID if defined
found := false
for _, pod := range pods {
if pod.Name != cp.PodName {
continue
}
if cp.Sandbox != "" {
pod.Sandbox = cp.Sandbox
}
pod.Containers = append(pod.Containers, cp)
found = true
break
}
if !found {
p := &ctrs.Pod{
Name: cp.PodName,
Containers: []*ctrs.Container{cp},
Sandbox: cp.Sandbox,
}
pods = append(pods, p)
}
}
// This seems janky because it is
// But we need to loop through everything again to associate
// the sandbox with the container name so we can get a proper
// filepath to the location of the logfile
for _, contents := range pods {
for _, cntr := range contents.Containers {
if cntr.Sandbox == "" && contents.Sandbox != "" {
cntr.Sandbox = contents.Sandbox
}
}
}
return pods, multiErr.ErrorOrNil()
}
// GetProcessStderr returns process stderr.
func (i *inspector) GetProcessStderr(id string) (string, error) {
task, err := i.client.TaskService().Get(i.nsctx, &tasks.GetRequest{ContainerID: id})
if err != nil {
return "", err
}
return task.Process.Stderr, nil
}
// Kill sends signal to container task.
func (i *inspector) Kill(id string, isPodSandbox bool, signal syscall.Signal) error {
_, err := i.client.TaskService().Kill(i.nsctx, &tasks.KillRequest{ContainerID: id, Signal: uint32(signal)})
return err
}