forked from vmware-archive/atc
/
image_resource_fetcher.go
320 lines (273 loc) · 7.68 KB
/
image_resource_fetcher.go
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package image
import (
"archive/tar"
"crypto/sha256"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"time"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/dbng"
"github.com/concourse/atc/resource"
"github.com/concourse/atc/worker"
)
const ImageMetadataFile = "metadata.json"
// ErrImageUnavailable is returned when a task's configured image resource
// has no versions.
var ErrImageUnavailable = errors.New("no versions of image available")
var ErrImageGetDidNotProduceVolume = errors.New("fetching the image did not produce a volume")
//go:generate counterfeiter . ImageResourceFetcherFactory
type ImageResourceFetcherFactory interface {
ImageResourceFetcherFor(worker.Worker) ImageResourceFetcher
}
//go:generate counterfeiter . ImageResourceFetcher
type ImageResourceFetcher interface {
Fetch(
logger lager.Logger,
signals <-chan os.Signal,
resourceUser dbng.ResourceUser,
imageResourceType string,
imageResourceSource atc.Source,
tags atc.Tags,
teamID int,
customTypes atc.VersionedResourceTypes,
imageFetchingDelegate worker.ImageFetchingDelegate,
privileged bool,
) (worker.Volume, io.ReadCloser, atc.Version, error)
}
type imageResourceFetcherFactory struct {
resourceFetcherFactory resource.FetcherFactory
resourceFactoryFactory resource.ResourceFactoryFactory
dbResourceCacheFactory dbng.ResourceCacheFactory
dbResourceConfigFactory dbng.ResourceConfigFactory
clock clock.Clock
}
func NewImageResourceFetcherFactory(
resourceFetcherFactory resource.FetcherFactory,
resourceFactoryFactory resource.ResourceFactoryFactory,
dbResourceCacheFactory dbng.ResourceCacheFactory,
dbResourceConfigFactory dbng.ResourceConfigFactory,
clock clock.Clock,
) ImageResourceFetcherFactory {
return &imageResourceFetcherFactory{
resourceFetcherFactory: resourceFetcherFactory,
resourceFactoryFactory: resourceFactoryFactory,
dbResourceCacheFactory: dbResourceCacheFactory,
dbResourceConfigFactory: dbResourceConfigFactory,
clock: clock,
}
}
func (f *imageResourceFetcherFactory) ImageResourceFetcherFor(worker worker.Worker) ImageResourceFetcher {
return &imageResourceFetcher{
resourceFetcher: f.resourceFetcherFactory.FetcherFor(worker),
resourceFactory: f.resourceFactoryFactory.FactoryFor(worker),
dbResourceCacheFactory: f.dbResourceCacheFactory,
dbResourceConfigFactory: f.dbResourceConfigFactory,
clock: f.clock,
}
}
type imageResourceFetcher struct {
resourceFetcher resource.Fetcher
resourceFactory resource.ResourceFactory
dbResourceCacheFactory dbng.ResourceCacheFactory
dbResourceConfigFactory dbng.ResourceConfigFactory
clock clock.Clock
}
func (i *imageResourceFetcher) Fetch(
logger lager.Logger,
signals <-chan os.Signal,
resourceUser dbng.ResourceUser,
imageResourceType string,
imageResourceSource atc.Source,
tags atc.Tags,
teamID int,
customTypes atc.VersionedResourceTypes,
imageFetchingDelegate worker.ImageFetchingDelegate,
privileged bool,
) (worker.Volume, io.ReadCloser, atc.Version, error) {
version, err := i.getLatestVersion(logger, signals, resourceUser, imageResourceType, imageResourceSource, tags, teamID, customTypes, imageFetchingDelegate)
if err != nil {
logger.Error("failed-to-get-latest-image-version", err)
return nil, nil, nil, err
}
resourceInstance := resource.NewResourceInstance(
resource.ResourceType(imageResourceType),
version,
imageResourceSource,
atc.Params{},
resourceUser,
customTypes,
i.dbResourceCacheFactory,
)
err = imageFetchingDelegate.ImageVersionDetermined(
resourceInstance.ResourceCacheIdentifier(),
)
if err != nil {
return nil, nil, nil, err
}
getSess := resource.Session{
Metadata: dbng.ContainerMetadata{
Type: dbng.ContainerTypeGet,
},
}
resourceType := resource.ResourceType(imageResourceType)
resourceOptions := &imageResourceOptions{
imageFetchingDelegate: imageFetchingDelegate,
source: imageResourceSource,
version: version,
resourceType: resourceType,
}
// we need resource cache for build
fetchSource, err := i.resourceFetcher.Fetch(
logger.Session("init-image"),
getSess,
tags,
teamID,
customTypes,
resourceInstance,
resource.EmptyMetadata{},
imageFetchingDelegate,
resourceOptions,
signals,
make(chan struct{}),
)
if err != nil {
logger.Error("failed-to-fetch-image", err)
return nil, nil, nil, err
}
versionedSource := fetchSource.VersionedSource()
volume := versionedSource.Volume()
if volume == nil {
return nil, nil, nil, ErrImageGetDidNotProduceVolume
}
reader, err := versionedSource.StreamOut(ImageMetadataFile)
if err != nil {
return nil, nil, nil, err
}
tarReader := tar.NewReader(reader)
_, err = tarReader.Next()
if err != nil {
return nil, nil, nil, fmt.Errorf("could not read file \"%s\" from tar", ImageMetadataFile)
}
releasingReader := &readCloser{
Reader: tarReader,
Closer: reader,
}
return volume, releasingReader, version, nil
}
func (i *imageResourceFetcher) getLatestVersion(
logger lager.Logger,
signals <-chan os.Signal,
resourceUser dbng.ResourceUser,
imageResourceType string,
imageResourceSource atc.Source,
tags atc.Tags,
teamID int,
customTypes atc.VersionedResourceTypes,
imageFetchingDelegate worker.ImageFetchingDelegate,
) (atc.Version, error) {
resourceSpec := worker.ContainerSpec{
ImageSpec: worker.ImageSpec{
ResourceType: imageResourceType,
Privileged: true,
},
Tags: tags,
TeamID: teamID,
}
for {
lock, acquired, err := i.dbResourceConfigFactory.AcquireResourceCheckingLock(
logger,
resourceUser,
imageResourceType,
imageResourceSource,
customTypes,
)
if err != nil {
logger.Error("failed-to-get-lock", err, lager.Data{
"resource-user": resourceUser,
})
return nil, err
}
if !acquired {
logger.Debug("did-not-get-lock")
i.clock.Sleep(time.Second)
continue
}
defer lock.Release()
break
}
checkingResource, err := i.resourceFactory.NewCheckResource(
logger,
signals,
resourceUser,
imageResourceType,
imageResourceSource,
dbng.ContainerMetadata{
Type: dbng.ContainerTypeCheck,
},
resourceSpec,
customTypes,
imageFetchingDelegate,
)
if err != nil {
return nil, err
}
versions, err := checkingResource.Check(imageResourceSource, nil)
if err != nil {
return nil, err
}
if len(versions) == 0 {
return nil, ErrImageUnavailable
}
return versions[0], nil
}
type leaseID struct {
Type resource.ResourceType `json:"type"`
Version atc.Version `json:"version"`
Source atc.Source `json:"source"`
WorkerName string `json:"worker_name"`
}
type imageResourceOptions struct {
imageFetchingDelegate worker.ImageFetchingDelegate
source atc.Source
version atc.Version
resourceType resource.ResourceType
}
func (d *imageResourceOptions) IOConfig() resource.IOConfig {
return resource.IOConfig{
Stderr: d.imageFetchingDelegate.Stderr(),
}
}
func (ir *imageResourceOptions) Source() atc.Source {
return ir.source
}
func (ir *imageResourceOptions) Params() atc.Params {
return nil
}
func (ir *imageResourceOptions) Version() atc.Version {
return ir.version
}
func (ir *imageResourceOptions) ResourceType() resource.ResourceType {
return ir.resourceType
}
func (ir *imageResourceOptions) LockName(workerName string) (string, error) {
id := &leaseID{
Type: ir.resourceType,
Version: ir.version,
Source: ir.source,
WorkerName: workerName,
}
taskNameJSON, err := json.Marshal(id)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", sha256.Sum256(taskNameJSON)), nil
}
type readCloser struct {
io.Reader
io.Closer
}