/
dockerhub_backend.go
43 lines (36 loc) · 1.21 KB
/
dockerhub_backend.go
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package storage
import (
"context"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
dockerClient "github.com/docker/docker/client"
"github.com/strabox/caravela/util"
"io/ioutil"
)
// DockerHubBackend represents a image storage backup that uses the Docker public registry to store
// and retrieve images to run in CARAVELA.
type DockerHubBackend struct {
BaseBackend
}
// newDockerHubBackend creates a new DockerHubBackend storage backend.
func newDockerHubBackend() (Backend, error) {
return &DockerHubBackend{
BaseBackend: BaseBackend{},
}, nil
}
func (dockerHub *DockerHubBackend) Init(dockerClient *dockerClient.Client) {
dockerHub.docker = dockerClient
}
func (dockerHub *DockerHubBackend) LoadImage(imageKey string) (string, error) {
out, err := dockerHub.docker.ImagePull(context.Background(), imageKey, types.ImagePullOptions{})
if err != nil { // Error pulling the image from Docker
log.Errorf(util.LogTag("DockerHub")+"Pulling container image error: %s", err)
return imageKey, err
}
defer out.Close()
if _, err := ioutil.ReadAll(out); err != nil {
log.Errorf(util.LogTag("DockerHub")+"Reading container image error: %s", err)
return imageKey, err
}
return imageKey, nil
}