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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/proxymanifeststore.go
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@ -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