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To avoid any network use unless necessary, delay establishing authorization

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challenges with the upstream until any proxied data is found not to be local.

Implement auth challenges behind an interface and add to unit tests.  Also,
remove a non-sensical unit test.

Signed-off-by: Richard Scothern <richard.scothern@docker.com>
This commit is contained in:
Richard Scothern 2016-02-10 18:07:28 -08:00
parent 881ef1096f
commit 7d16fee7a4
8 changed files with 156 additions and 44 deletions
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9
docs/proxy/proxyauth.go
View file

@ -8,6 +8,7 @@ import (
)
const tokenURL = "https://auth.docker.io/token"
const challengeHeader = "Docker-Distribution-Api-Version"
type userpass struct {
username string
@ -24,12 +25,8 @@ func (c credentials) Basic(u *url.URL) (string, string) {
return up.username, up.password
}
// ConfigureAuth authorizes with the upstream registry
func ConfigureAuth(remoteURL, username, password string, cm auth.ChallengeManager) (auth.CredentialStore, error) {
if err := ping(cm, remoteURL+"/v2/", "Docker-Distribution-Api-Version"); err != nil {
return nil, err
}
// ConfigureAuth stores credentials for challenge responses
func configureAuth(username, password string) (auth.CredentialStore, error) {
creds := map[string]userpass{
tokenURL: {
username: username,

9
docs/proxy/proxyblobstore.go
View file

@ -22,6 +22,7 @@ type proxyBlobStore struct {
remoteStore distribution.BlobService
scheduler *scheduler.TTLExpirationScheduler
repositoryName reference.Named
authChallenger authChallenger
}
var _ distribution.BlobStore = &proxyBlobStore{}
@ -121,6 +122,10 @@ func (pbs *proxyBlobStore) ServeBlob(ctx context.Context, w http.ResponseWriter,
return nil
}
if err := pbs.authChallenger.tryEstablishChallenges(ctx); err != nil {
return err
}
mu.Lock()
_, ok := inflight[dgst]
if ok {
@ -162,6 +167,10 @@ func (pbs *proxyBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distri
return distribution.Descriptor{}, err
}
if err := pbs.authChallenger.tryEstablishChallenges(ctx); err != nil {
return distribution.Descriptor{}, err
}
return pbs.remoteStore.Stat(ctx, dgst)
}

6
docs/proxy/proxyblobstore_test.go
View file

@ -168,6 +168,7 @@ func makeTestEnv(t *testing.T, name string) *testEnv {
remoteStore: truthBlobs,
localStore: localBlobs,
scheduler: s,
authChallenger: &mockChallenger{},
}
te := &testEnv{
@ -242,6 +243,11 @@ func TestProxyStoreStat(t *testing.T) {
if (*remoteStats)["stat"] != remoteBlobCount {
t.Errorf("Unexpected remote stat count")
}
if te.store.authChallenger.(*mockChallenger).count != len(te.inRemote) {
t.Fatalf("Unexpected auth challenge count, got %#v", te.store.authChallenger)
}
}
func TestProxyStoreServeHighConcurrency(t *testing.T) {

9
docs/proxy/proxymanifeststore.go
View file

@ -19,6 +19,7 @@ type proxyManifestStore struct {
remoteManifests distribution.ManifestService
repositoryName reference.Named
scheduler *scheduler.TTLExpirationScheduler
authChallenger authChallenger
}
var _ distribution.ManifestService = &proxyManifestStore{}
@ -31,7 +32,9 @@ func (pms proxyManifestStore) Exists(ctx context.Context, dgst digest.Digest) (b
if exists {
return true, nil
}
if err := pms.authChallenger.tryEstablishChallenges(ctx); err != nil {
return false, err
}
return pms.remoteManifests.Exists(ctx, dgst)
}
@ -41,6 +44,10 @@ func (pms proxyManifestStore) Get(ctx context.Context, dgst digest.Digest, optio
var fromRemote bool
manifest, err := pms.localManifests.Get(ctx, dgst, options...)
if err != nil {
if err := pms.authChallenger.tryEstablishChallenges(ctx); err != nil {
return nil, err
}
manifest, err = pms.remoteManifests.Get(ctx, dgst, options...)
if err != nil {
return nil, err

37
docs/proxy/proxymanifeststore_test.go
View file

@ -2,6 +2,7 @@ package proxy
import (
"io"
"sync"
"testing"
"github.com/docker/distribution"
@ -64,6 +65,20 @@ func (sm statsManifest) Put(ctx context.Context, manifest distribution.Manifest,
}
*/
type mockChallenger struct {
sync.Mutex
count int
}
// Called for remote operations only
func (mc *mockChallenger) tryEstablishChallenges(context.Context) error {
mc.Lock()
defer mc.Unlock()
mc.count++
return nil
}
func newManifestStoreTestEnv(t *testing.T, name, tag string) *manifestStoreTestEnv {
nameRef, err := reference.ParseNamed(name)
if err != nil {
@ -120,6 +135,7 @@ func newManifestStoreTestEnv(t *testing.T, name, tag string) *manifestStoreTestE
remoteManifests: truthManifests,
scheduler: s,
repositoryName: nameRef,
authChallenger: &mockChallenger{},
},
}
}
@ -198,6 +214,10 @@ func TestProxyManifests(t *testing.T) {
t.Errorf("Unexpected exists count : \n%v \n%v", localStats, remoteStats)
}
if env.manifests.authChallenger.(*mockChallenger).count != 1 {
t.Fatalf("Expected 1 auth challenge, got %#v", env.manifests.authChallenger)
}
// Get - should succeed and pull manifest into local
_, err = env.manifests.Get(ctx, env.manifestDigest)
if err != nil {
@ -212,6 +232,10 @@ func TestProxyManifests(t *testing.T) {
t.Errorf("Expected local put")
}
if env.manifests.authChallenger.(*mockChallenger).count != 2 {
t.Fatalf("Expected 2 auth challenges, got %#v", env.manifests.authChallenger)
}
// Stat - should only go to local
exists, err = env.manifests.Exists(ctx, env.manifestDigest)
if err != nil {
@ -225,17 +249,18 @@ func TestProxyManifests(t *testing.T) {
t.Errorf("Unexpected exists count")
}
// Get - should get from remote, to test freshness
if env.manifests.authChallenger.(*mockChallenger).count != 2 {
t.Fatalf("Expected 2 auth challenges, got %#v", env.manifests.authChallenger)
}
// Get proxied - won't require another authchallenge
_, err = env.manifests.Get(ctx, env.manifestDigest)
if err != nil {
t.Fatal(err)
}
if (*remoteStats)["get"] != 2 && (*remoteStats)["exists"] != 1 && (*localStats)["put"] != 1 {
t.Errorf("Unexpected get count")
if env.manifests.authChallenger.(*mockChallenger).count != 2 {
t.Fatalf("Expected 2 auth challenges, got %#v", env.manifests.authChallenger)
}
}
func TestProxyTagService(t *testing.T) {
}

80
docs/proxy/proxyregistry.go
View file

@ -1,10 +1,11 @@
package proxy
import (
"fmt"
"net/http"
"net/url"
"sync"
"fmt"
"github.com/docker/distribution"
"github.com/docker/distribution/configuration"
"github.com/docker/distribution/context"
@ -19,13 +20,10 @@ import (
// proxyingRegistry fetches content from a remote registry and caches it locally
type proxyingRegistry struct {
embedded distribution.Namespace // provides local registry functionality
scheduler *scheduler.TTLExpirationScheduler
remoteURL string
credentialStore auth.CredentialStore
challengeManager auth.ChallengeManager
embedded distribution.Namespace // provides local registry functionality
scheduler *scheduler.TTLExpirationScheduler
remoteURL string
authChallenger authChallenger
}
// NewRegistryPullThroughCache creates a registry acting as a pull through cache
@ -93,18 +91,20 @@ func NewRegistryPullThroughCache(ctx context.Context, registry distribution.Name
return nil, err
}
challengeManager := auth.NewSimpleChallengeManager()
cs, err := ConfigureAuth(config.RemoteURL, config.Username, config.Password, challengeManager)
cs, err := configureAuth(config.Username, config.Password)
if err != nil {
return nil, err
}
return &proxyingRegistry{
embedded: registry,
scheduler: s,
challengeManager: challengeManager,
credentialStore: cs,
remoteURL: config.RemoteURL,
embedded: registry,
scheduler: s,
remoteURL: config.RemoteURL,
authChallenger: &remoteAuthChallenger{
remoteURL: config.RemoteURL,
challengeManager: auth.NewSimpleChallengeManager(),
credentialStore: cs,
},
}, nil
}
@ -117,8 +117,13 @@ func (pr *proxyingRegistry) Repositories(ctx context.Context, repos []string, la
}
func (pr *proxyingRegistry) Repository(ctx context.Context, name reference.Named) (distribution.Repository, error) {
hcm, ok := pr.authChallenger.(*remoteAuthChallenger)
if !ok {
return nil, fmt.Errorf("unexpected challenge manager type %T", pr.authChallenger)
}
tr := transport.NewTransport(http.DefaultTransport,
auth.NewAuthorizer(pr.challengeManager, auth.NewTokenHandler(http.DefaultTransport, pr.credentialStore, name.Name(), "pull")))
auth.NewAuthorizer(hcm.challengeManager, auth.NewTokenHandler(http.DefaultTransport, hcm.credentialStore, name.Name(), "pull")))
localRepo, err := pr.embedded.Repository(ctx, name)
if err != nil {
@ -145,6 +150,7 @@ func (pr *proxyingRegistry) Repository(ctx context.Context, name reference.Named
remoteStore: remoteRepo.Blobs(ctx),
scheduler: pr.scheduler,
repositoryName: name,
authChallenger: pr.authChallenger,
},
manifests: &proxyManifestStore{
repositoryName: name,
@ -152,15 +158,53 @@ func (pr *proxyingRegistry) Repository(ctx context.Context, name reference.Named
remoteManifests: remoteManifests,
ctx: ctx,
scheduler: pr.scheduler,
authChallenger: pr.authChallenger,
},
name: name,
tags: &proxyTagService{
localTags: localRepo.Tags(ctx),
remoteTags: remoteRepo.Tags(ctx),
localTags: localRepo.Tags(ctx),
remoteTags: remoteRepo.Tags(ctx),
authChallenger: pr.authChallenger,
},
}, nil
}
// authChallenger encapsulates a request to the upstream to establish credential challenges
type authChallenger interface {
tryEstablishChallenges(context.Context) error
}
type remoteAuthChallenger struct {
remoteURL string
sync.Mutex
challengeManager auth.ChallengeManager
credentialStore auth.CredentialStore
}
// tryEstablishChallenges will attempt to get a challenge types for the upstream if none currently exist
func (hcm *remoteAuthChallenger) tryEstablishChallenges(ctx context.Context) error {
hcm.Lock()
defer hcm.Unlock()
remoteURL := hcm.remoteURL + "/v2/"
challenges, err := hcm.challengeManager.GetChallenges(remoteURL)
if err != nil {
return err
}
if len(challenges) > 0 {
return nil
}
// establish challenge type with upstream
if err := ping(hcm.challengeManager, remoteURL, challengeHeader); err != nil {
return err
}
context.GetLogger(ctx).Infof("Challenge established with upstream : %s %s", remoteURL, hcm.challengeManager)
return nil
}
// proxiedRepository uses proxying blob and manifest services to serve content
// locally, or pulling it through from a remote and caching it locally if it doesn't
// already exist

27
docs/proxy/proxytagservice.go
View file

@ -7,8 +7,9 @@ import (
// proxyTagService supports local and remote lookup of tags.
type proxyTagService struct {
localTags distribution.TagService
remoteTags distribution.TagService
localTags distribution.TagService
remoteTags distribution.TagService
authChallenger authChallenger
}
var _ distribution.TagService = proxyTagService{}
@ -17,16 +18,19 @@ var _ distribution.TagService = proxyTagService{}
// tag service first and then caching it locally. If the remote is unavailable
// the local association is returned
func (pt proxyTagService) Get(ctx context.Context, tag string) (distribution.Descriptor, error) {
desc, err := pt.remoteTags.Get(ctx, tag)
err := pt.authChallenger.tryEstablishChallenges(ctx)
if err == nil {
err := pt.localTags.Tag(ctx, tag, desc)
if err != nil {
return distribution.Descriptor{}, err
desc, err := pt.remoteTags.Get(ctx, tag)
if err == nil {
err := pt.localTags.Tag(ctx, tag, desc)
if err != nil {
return distribution.Descriptor{}, err
}
return desc, nil
}
return desc, nil
}
desc, err = pt.localTags.Get(ctx, tag)
desc, err := pt.localTags.Get(ctx, tag)
if err != nil {
return distribution.Descriptor{}, err
}
@ -46,9 +50,12 @@ func (pt proxyTagService) Untag(ctx context.Context, tag string) error {
}
func (pt proxyTagService) All(ctx context.Context) ([]string, error) {
tags, err := pt.remoteTags.All(ctx)
err := pt.authChallenger.tryEstablishChallenges(ctx)
if err == nil {
return tags, err
tags, err := pt.remoteTags.All(ctx)
if err == nil {
return tags, err
}
}
return pt.localTags.All(ctx)
}

23
docs/proxy/proxytagservice_test.go
View file

@ -69,8 +69,9 @@ func testProxyTagService(local, remote map[string]distribution.Descriptor) *prox
remote = make(map[string]distribution.Descriptor)
}
return &proxyTagService{
localTags: &mockTagStore{mapping: local},
remoteTags: &mockTagStore{mapping: remote},
localTags: &mockTagStore{mapping: local},
remoteTags: &mockTagStore{mapping: remote},
authChallenger: &mockChallenger{},
}
}
@ -87,6 +88,10 @@ func TestGet(t *testing.T) {
t.Fatal(err)
}
if proxyTags.authChallenger.(*mockChallenger).count != 1 {
t.Fatalf("Expected 1 auth challenge call, got %#v", proxyTags.authChallenger)
}
if d != remoteDesc {
t.Fatal("unable to get put tag")
}
@ -112,6 +117,10 @@ func TestGet(t *testing.T) {
t.Fatal(err)
}
if proxyTags.authChallenger.(*mockChallenger).count != 2 {
t.Fatalf("Expected 2 auth challenge calls, got %#v", proxyTags.authChallenger)
}
if d != newRemoteDesc {
t.Fatal("unable to get put tag")
}
@ -142,7 +151,11 @@ func TestGet(t *testing.T) {
t.Fatal("untagged tag should be pulled through")
}
// Add another tag. Ensure both tags appear in enumerate
if proxyTags.authChallenger.(*mockChallenger).count != 3 {
t.Fatalf("Expected 3 auth challenge calls, got %#v", proxyTags.authChallenger)
}
// Add another tag. Ensure both tags appear in 'All'
err = proxyTags.remoteTags.Tag(ctx, "funtag", distribution.Descriptor{Size: 42})
if err != nil {
t.Fatal(err)
@ -161,4 +174,8 @@ func TestGet(t *testing.T) {
if all[0] != "funtag" && all[1] != "remote" {
t.Fatalf("Unexpected tags returned from All() : %v ", all)
}
if proxyTags.authChallenger.(*mockChallenger).count != 4 {
t.Fatalf("Expected 4 auth challenge calls, got %#v", proxyTags.authChallenger)
}
}