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docker.go
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docker.go
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/* Helpers functions for docker in both the infranetes cri implementation and the vmserver */
package common
import (
"errors"
"fmt"
"strconv"
"strings"
"time"
dockertypes "github.com/docker/engine-api/types"
dockerfilters "github.com/docker/engine-api/types/filters"
kubeapi "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
)
func GenerateEnvList(envs []*kubeapi.KeyValue) (result []string) {
for _, env := range envs {
result = append(result, fmt.Sprintf("%s=%s", env.GetKey(), env.GetValue()))
}
return
}
const (
annotationPrefix = "annotation."
)
func MakeLabels(labels, annotations map[string]string) map[string]string {
merged := make(map[string]string)
for k, v := range labels {
merged[k] = v
}
for k, v := range annotations {
// Assume there won't be conflict.
merged[fmt.Sprintf("%s%s", annotationPrefix, k)] = v
}
return merged
}
func ToDockerContainerStatus(state kubeapi.ContainerState) string {
switch state {
case kubeapi.ContainerState_CONTAINER_CREATED:
return "created"
case kubeapi.ContainerState_CONTAINER_RUNNING:
return "running"
case kubeapi.ContainerState_CONTAINER_EXITED:
return "exited"
case kubeapi.ContainerState_CONTAINER_UNKNOWN:
fallthrough
default:
return "unknown"
}
}
const (
// Status of a container returned by docker ListContainers
statusRunningPrefix = "Up"
statusCreatedPrefix = "Created"
statusExitedPrefix = "Exited"
)
func ToRuntimeAPIContainerState(state string) kubeapi.ContainerState {
// Parse the state string in dockertypes.Container. This could break when
// we upgrade docker.
switch {
case strings.HasPrefix(state, statusRunningPrefix):
return kubeapi.ContainerState_CONTAINER_RUNNING
case strings.HasPrefix(state, statusExitedPrefix):
return kubeapi.ContainerState_CONTAINER_EXITED
case strings.HasPrefix(state, statusCreatedPrefix):
return kubeapi.ContainerState_CONTAINER_CREATED
default:
return kubeapi.ContainerState_CONTAINER_UNKNOWN
}
}
func parseUint32(s string) (uint32, error) {
n, err := strconv.ParseUint(s, 10, 32)
if err != nil {
return 0, err
}
return uint32(n), nil
}
func ToRuntimeAPIContainer(podId string, name string, c *dockertypes.Container) (*kubeapi.Container, error) {
state := ToRuntimeAPIContainerState(c.Status)
id := podId + ":" + c.ID
metadata, err := ParseContainerName(name)
if err != nil {
return nil, fmt.Errorf("toRuntimeAPIContainer: unable to parse name label: %q", c.Names[0])
}
labels, annotations := ExtractLabels(c.Labels)
return &kubeapi.Container{
Id: id,
Metadata: metadata,
Image: &kubeapi.ImageSpec{Image: c.Image},
ImageRef: c.ImageID,
State: state,
Labels: labels,
Annotations: annotations,
}, nil
}
var (
kubePrefix = "kube"
nameDelimiter = "_"
containerNameLabel = "containerNameLabel"
)
func MakeContainerName(s *kubeapi.PodSandboxConfig, c *kubeapi.ContainerConfig) string {
sandboxMetadata := &kubeapi.PodSandboxMetadata{}
if s != nil && s.Metadata != nil {
sandboxMetadata = s.Metadata
}
contMetadata := &kubeapi.ContainerMetadata{}
if c != nil && c.Metadata != nil {
contMetadata = c.Metadata
}
return strings.Join([]string{
kubePrefix, // 0
contMetadata.GetName(), // 1:
sandboxMetadata.GetName(), // 2: sandbox name
sandboxMetadata.GetNamespace(), // 3: sandbox namesapce
sandboxMetadata.GetUid(), // 4 sandbox uid
fmt.Sprintf("%d", contMetadata.GetAttempt()), // 5
}, nameDelimiter)
}
// TODO: Evaluate whether we should rely on labels completely.
func ParseContainerName(name string) (*kubeapi.ContainerMetadata, error) {
parts := strings.Split(name, nameDelimiter)
if len(parts) != 6 {
return nil, fmt.Errorf("failed to parse the container name: %q", name)
}
if parts[0] != kubePrefix {
return nil, fmt.Errorf("container is not managed by kubernetes: %q", name)
}
attempt, err := parseUint32(parts[5])
if err != nil {
return nil, fmt.Errorf("failed to parse the container name %q: %v", name, err)
}
return &kubeapi.ContainerMetadata{
Name: parts[1],
Attempt: attempt,
}, nil
}
// dockerFilter wraps around dockerfilters.Args and provides methods to modify
// the filter easily.
type dockerFilter struct {
args *dockerfilters.Args
}
func NewDockerFilter(args *dockerfilters.Args) *dockerFilter {
return &dockerFilter{args: args}
}
func (f *dockerFilter) Add(key, value string) {
f.args.Add(key, value)
}
func (f *dockerFilter) AddLabel(key, value string) {
f.Add("label", fmt.Sprintf("%s=%s", key, value))
}
// ParseDockerTimestamp parses the timestamp returned by DockerInterface from string to time.Time
func ParseDockerTimestamp(s string) (time.Time, error) {
// Timestamp returned by Docker is in time.RFC3339Nano format.
return time.Parse(time.RFC3339Nano, s)
}
func GetContainerTimestamps(r *dockertypes.ContainerJSON) (time.Time, time.Time, time.Time, error) {
var createdAt, startedAt, finishedAt time.Time
var err error
createdAt, err = ParseDockerTimestamp(r.Created)
if err != nil {
return createdAt, startedAt, finishedAt, err
}
startedAt, err = ParseDockerTimestamp(r.State.StartedAt)
if err != nil {
return createdAt, startedAt, finishedAt, err
}
finishedAt, err = ParseDockerTimestamp(r.State.FinishedAt)
if err != nil {
return createdAt, startedAt, finishedAt, err
}
return createdAt, startedAt, finishedAt, nil
}
func ExtractLabels(input map[string]string) (map[string]string, map[string]string) {
labels := make(map[string]string)
annotations := make(map[string]string)
for k, v := range input {
// Check if the label should be treated as an annotation.
if strings.HasPrefix(k, annotationPrefix) {
annotations[strings.TrimPrefix(k, annotationPrefix)] = v
continue
}
labels[k] = v
}
return labels, annotations
}
func ToRuntimeAPIImage(image *dockertypes.Image) (*kubeapi.Image, error) {
if image == nil {
return nil, errors.New("unable to convert a nil pointer to a runtime API image")
}
size := uint64(image.VirtualSize)
return &kubeapi.Image{
Id: image.ID,
RepoTags: image.RepoTags,
RepoDigests: image.RepoDigests,
Size_: size,
}, nil
}