/
image-service.go
157 lines (141 loc) · 4.63 KB
/
image-service.go
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package docker
import (
"bufio"
"context"
"encoding/base64"
"fmt"
"log"
"os"
"time"
dockerregistryproxyv1 "github.com/VJftw/docker-registry-proxy/api/proto/v1"
"github.com/docker/docker/api/types"
"github.com/google/cadvisor/fs"
dockerclient "github.com/docker/docker/client"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
)
// ImageService represents a custom Docker image service for K8s
type ImageService struct {
client *dockerclient.Client
authProviders map[string]dockerregistryproxyv1.AuthenticationProviderAPIClient
}
// NewImageService returns a new instance of the Docker Image Service with the given authentication providers
func NewImageService(authProviders map[string]dockerregistryproxyv1.AuthenticationProviderAPIClient) (*ImageService, error) {
client, err := dockerclient.NewClientWithOpts()
if err != nil {
return nil, fmt.Errorf("could not create new docker client: %w", err)
}
if err := dockerclient.FromEnv(client); err != nil {
return nil, fmt.Errorf("could not configure docker client from environment: %w", err)
}
return &ImageService{
client: client,
authProviders: authProviders,
}, nil
}
// ListImages returns a List of Images
// TODO: filter images based on request
func (s *ImageService) ListImages(ctx context.Context, req *runtimeapi.ListImagesRequest) (*runtimeapi.ListImagesResponse, error) {
images, err := s.client.ImageList(ctx, types.ImageListOptions{})
if err != nil {
return nil, err
}
respImages := []*runtimeapi.Image{}
for _, image := range images {
respImages = append(respImages, &runtimeapi.Image{
Id: image.ID,
RepoTags: image.RepoTags,
RepoDigests: image.RepoDigests,
Size_: uint64(image.Size),
})
}
return &runtimeapi.ListImagesResponse{
Images: respImages,
}, nil
}
// ImageStatus returns the status of a given image
func (s *ImageService) ImageStatus(ctx context.Context, req *runtimeapi.ImageStatusRequest) (*runtimeapi.ImageStatusResponse, error) {
image, _, err := s.client.ImageInspectWithRaw(ctx, req.GetImage().GetImage())
resp := &runtimeapi.ImageStatusResponse{}
if err != nil {
return resp, nil
}
resp.Image = &runtimeapi.Image{
Id: image.ID,
RepoTags: image.RepoTags,
RepoDigests: image.RepoDigests,
Size_: uint64(image.Size),
}
return resp, nil
}
// PullImage pulls a Docker Image
func (s *ImageService) PullImage(ctx context.Context, req *runtimeapi.PullImageRequest) (*runtimeapi.PullImageResponse, error) {
img := req.GetImage().GetImage()
imgPullOpts := types.ImagePullOptions{All: false}
repository, err := GetRepository(img)
if err != nil {
return nil, err
}
authProvider, err := ResolveRepositoryAuthProvider(repository, s.authProviders)
if err != nil {
log.Println(err) // Only warn for images that may not need authentication
}
if authProvider != nil {
authResp, err := authProvider.Provide(ctx, &dockerregistryproxyv1.ProvideRequest{})
if err != nil {
return nil, err
}
regAuth := base64.StdEncoding.EncodeToString(
[]byte(fmt.Sprintf(
`{"username": "%s", "password": "%s"}`,
authResp.GetUsername(),
authResp.GetPassword(),
)),
)
imgPullOpts.RegistryAuth = regAuth
}
out, err := s.client.ImagePull(ctx, img, imgPullOpts)
if err != nil {
return nil, err
}
scanner := bufio.NewScanner(out)
for scanner.Scan() {
os.Stdout.Write(scanner.Bytes())
}
out.Close()
image, _, err := s.client.ImageInspectWithRaw(ctx, req.GetImage().GetImage())
if err != nil {
return nil, err
}
return &runtimeapi.PullImageResponse{
ImageRef: image.ID,
}, nil
}
// RemoveImage Removes the given Docker image
func (s *ImageService) RemoveImage(ctx context.Context, req *runtimeapi.RemoveImageRequest) (*runtimeapi.RemoveImageResponse, error) {
_, err := s.client.ImageRemove(ctx, req.GetImage().GetImage(), types.ImageRemoveOptions{PruneChildren: true})
if err != nil {
return nil, err
}
return &runtimeapi.RemoveImageResponse{}, nil
}
// ImageFsInfo returns status about the filesystem that images are stored on
func (s *ImageService) ImageFsInfo(ctx context.Context, _ *runtimeapi.ImageFsInfoRequest) (*runtimeapi.ImageFsInfoResponse, error) {
info, err := s.client.Info(ctx)
if err != nil {
return nil, err
}
usageInfo, err := fs.GetDirUsage(info.DockerRootDir)
if err != nil {
return nil, err
}
return &runtimeapi.ImageFsInfoResponse{
ImageFilesystems: []*runtimeapi.FilesystemUsage{
{
Timestamp: time.Now().UnixNano(),
FsId: &runtimeapi.FilesystemIdentifier{Mountpoint: info.DockerRootDir},
UsedBytes: &runtimeapi.UInt64Value{Value: usageInfo.Bytes},
InodesUsed: &runtimeapi.UInt64Value{Value: usageInfo.Inodes},
},
},
}, nil
}