/
image_manager.go
347 lines (319 loc) · 9.37 KB
/
image_manager.go
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package native
import (
"context"
"encoding/json"
"fmt"
"git.mills.io/prologic/bitcask"
"github.com/containerd/containerd/images"
cc "github.com/containers/image/v5/copy"
"github.com/containers/image/v5/directory"
"github.com/containers/image/v5/docker/archive"
"github.com/containers/image/v5/signature"
"github.com/containers/image/v5/transports"
"github.com/containers/image/v5/transports/alltransports"
"github.com/containers/image/v5/types"
"github.com/flytam/filenamify"
"github.com/kok-stack/native-kubelet/trace"
"github.com/opencontainers/go-digest"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"io/ioutil"
"math/rand"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
)
const pullLogPrefix = "native-kubelet-pullImage-"
const manifestFileName = "manifest.json"
var insecurePolicy = []byte(`{"default":[{"type":"insecureAcceptAnything"}]}`)
type ImagePulling struct {
imageName string
ch chan interface{}
f *os.File
}
func NewImagePulling(imageName string) *ImagePulling {
return &ImagePulling{
imageName: imageName,
ch: make(chan interface{}),
}
}
type ImageManager struct {
imagePath string
pulling sync.Map
imageDb *bitcask.Bitcask
max int
}
func NewImageManager(imagePath string, db *bitcask.Bitcask, max int) *ImageManager {
return &ImageManager{
imagePath: imagePath,
imageDb: db,
max: max,
}
}
type PullImageOpts struct {
SrcImage string // docker://ccr.ccs.tencentyun.com/k8s-test/test:oci-test-v1
DockerAuthConfig *types.DockerAuthConfig
DockerBearerRegistryToken string
DockerRegistryUserAgent string
DockerInsecureSkipTLSVerify types.OptionalBool
Timeout time.Duration
RetryCount int
//Stdout io.Writer
}
func (m *ImageManager) PullImage(parentCtx context.Context, opts PullImageOpts) error {
ctx, span := trace.StartSpan(parentCtx, "ImageManager.PullImage")
defer span.End()
name := opts.SrcImage
srcRef, err := alltransports.ParseImageName(name)
if err != nil {
span.Logger().Errorf("解析image源出现错误,error:%v", err)
span.SetStatus(err)
return err
}
dest, imageDir, err := imageDestDir(m.imagePath, opts.SrcImage)
if err != nil {
span.Logger().Errorf("构建image目的地出现错误,error:%v", err)
span.SetStatus(err)
return err
}
//检查文件夹是否存在,不存在则创建
if err := checkAndCreatePath(filepath.Dir(imageDir)); err != nil {
span.Logger().Errorf("检查镜像目的地目录是否存在出现错误,error:%v", err)
span.SetStatus(err)
return err
}
destRef, err := alltransports.ParseImageName(dest)
if err != nil {
span.Logger().Errorf("解析image目的地错误,error:%v", err)
span.SetStatus(err)
return err
}
sourceCtx := &types.SystemContext{
DockerAuthConfig: opts.DockerAuthConfig,
DockerBearerRegistryToken: opts.DockerBearerRegistryToken,
DockerRegistryUserAgent: opts.DockerRegistryUserAgent,
DockerInsecureSkipTLSVerify: opts.DockerInsecureSkipTLSVerify,
}
destinationCtx := &types.SystemContext{}
policy, err := signature.NewPolicyFromBytes(insecurePolicy)
if err != nil {
span.Logger().Errorf("获取安全策略,error:%v", err)
span.SetStatus(err)
return err
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
span.Logger().Errorf("获取安全策略上下文,error:%v", err)
span.SetStatus(err)
return err
}
if opts.Timeout == 0 {
opts.Timeout = time.Duration(m.max) * time.Second
}
subCtx, cancel := context.WithTimeout(ctx, opts.Timeout)
defer cancel()
check:
//检查是否存在镜像
ok := m.imageDb.Has([]byte(name))
if ok {
span.Logger().Debug("检查到镜像存在,直接返回")
return nil
}
//如果不存在,检查是否正在pull
v, ok := m.pulling.Load(name)
if ok {
//正在pull,则等到pull结束
span.Logger().Debug("镜像正在pull,等到pull结束")
pull := v.(*ImagePulling)
<-pull.ch
span.Logger().Debug("镜像pull结束")
goto check
}
//没有在pull,则执行pull
span.Logger().Debug("镜像未pull,开始执行pull")
pulling := NewImagePulling(name)
m.pulling.LoadOrStore(name, pulling)
defer close(pulling.ch)
defer m.pulling.Delete(name)
logName := strconv.Itoa(rand.Intn(time.Now().Nanosecond()))
err = deleteExistImage(imageDir)
pulling.f, err = os.OpenFile(filepath.Join(os.TempDir(), fmt.Sprintf("%s-%s", pullLogPrefix, logName)), os.O_CREATE|os.O_RDWR, 0755)
if err != nil {
span.Logger().Errorf("打开pull日志文件,error:%v", err)
span.SetStatus(err)
return err
}
defer pulling.f.Close()
_, err = cc.Image(subCtx, policyContext, destRef, srcRef, &cc.Options{
ReportWriter: pulling.f,
SourceCtx: sourceCtx,
DestinationCtx: destinationCtx,
ImageListSelection: cc.CopySystemImage,
})
if err != nil {
span.Logger().Errorf("pull镜像错误,error:%v", err)
span.SetStatus(err)
return err
}
return m.imageDb.Put([]byte(name), []byte(dest))
}
func deleteExistImage(dir string) error {
if err := os.Remove(dir); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
return nil
}
func checkAndCreatePath(dir string) error {
_, err := os.Stat(dir)
if err == nil {
return nil
}
if os.IsNotExist(err) {
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
return err
}
return nil
}
return err
}
func (m *ImageManager) UnzipImage(ctx context.Context, image string, workdir string) error {
imageDir := getImageWorkDir(workdir)
ctx, span := trace.StartSpan(ctx, "ImageManager.UnzipImage")
ctx = span.WithFields(ctx, map[string]interface{}{
"image": image,
"workdir": workdir,
"imageDir": imageDir,
})
defer span.End()
policy, err := signature.NewPolicyFromBytes(insecurePolicy)
if err != nil {
span.Logger().Errorf("获取安全策略,error:%v", err)
span.SetStatus(err)
return err
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
span.Logger().Errorf("获取安全策略上下文,error:%v", err)
span.SetStatus(err)
return err
}
//解析workdir
if err := checkAndCreatePath(imageDir); err != nil {
span.Logger().Errorf("检查并创建workdir,error:%v", err)
span.SetStatus(err)
return err
}
destRef, err := directory.Transport.ParseReference(imageDir)
if err != nil {
span.Logger().Errorf("解析目的地,error:%v", err)
span.SetStatus(err)
return err
}
//获取image的path
imagePath, err := m.imageDb.Get([]byte(dockerImageName(image)))
if err != nil {
span.Logger().Errorf("获取镜像存储路径,error:%v", err)
span.SetStatus(err)
return err
}
//解析
srcRef, err := alltransports.ParseImageName(string(imagePath))
if err != nil {
span.Logger().Errorf("解析存储路径,error:%v", err)
span.SetStatus(err)
return err
}
sourceCtx := &types.SystemContext{}
destinationCtx := &types.SystemContext{}
//解压镜像
if _, err := cc.Image(ctx, policyContext, destRef, srcRef, &cc.Options{
ReportWriter: nil,
SourceCtx: sourceCtx,
DestinationCtx: destinationCtx,
ImageListSelection: cc.CopySystemImage,
}); err != nil {
span.Logger().Errorf("解压镜像tar包,error:%v", err)
span.SetStatus(err)
return err
}
span.Logger().Debug("解压tar包完成,开始解压镜像layer")
//解压 "层"
content, err := ioutil.ReadFile(manifestDir(imageDir))
if err != nil {
span.Logger().Errorf("解压镜像layer错误,err:%v", err)
span.SetStatus(err)
return err
}
manifest := &v1.Manifest{}
err = json.Unmarshal(content, manifest)
if err != nil {
span.Logger().Errorf("反序列化Manifest错误,error:%v", err)
span.SetStatus(err)
return err
}
for _, layer := range manifest.Layers {
switch layer.MediaType {
case images.MediaTypeDockerSchema2LayerGzip:
dir := containerWorkDir(workdir)
err = checkAndCreatePath(dir)
if err != nil {
span.Logger().Errorf("检查并创建容器工作目录:%v,error:%v,layer:%s", dir, err, layer.Digest.Encoded())
span.SetStatus(err)
return err
}
err = UnTar(getLayerFilePath(imageDir, layer.Digest), dir)
if err != nil {
span.Logger().Errorf("用tar包解压层错误,error:%v,layer:%s", err, layer.Digest.Encoded())
span.SetStatus(err)
return err
}
default:
err := fmt.Errorf("unsupport image %s layer %s media type:%s", image, layer.Digest.Encoded(), layer.MediaType)
span.SetStatus(err)
return err
}
}
return nil
}
func getLayerFilePath(imageDir string, digest digest.Digest) string {
return filepath.Join(imageDir, digest.Encoded())
}
func containerWorkDir(workdir string) string {
return filepath.Join(workdir, "container")
}
func manifestDir(workdir string) string {
return filepath.Join(workdir, manifestFileName)
}
func getImageWorkDir(workdir string) string {
return filepath.Join(workdir, "image")
}
/*
输入
path=/path
imageName=docker://imagename
返回
docker-archive:/path/imagename.tar.gz
/path/imagename.tar.gz
*/
func imageDestDir(path string, imageName string) (string, string, error) {
names := append(transports.ListNames(), "//")
replaceNames := make([]string, len(names)*2)
for i, n := range names {
replaceNames[i*2] = n
replaceNames[i*2+1] = ""
}
replacer := strings.NewReplacer(replaceNames...)
replace := replacer.Replace(imageName)
imageName = replace
s, err := filenamify.Filenamify(imageName, filenamify.Options{Replacement: "-"})
if err != nil {
return "", "", err
}
filep := fmt.Sprintf("%s.tar.gz", filepath.Join(path, s))
return fmt.Sprintf("%s:%s", archive.Transport.Name(), filep), filep, nil
}