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To avoid any network use unless necessary, delay establishing authorization

Browse source 
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)
}
}