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cache_test.go
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package cache
import (
"context"
"errors"
"testing"
"github.com/distribution/distribution/v3"
digest "github.com/opencontainers/go-digest"
)
func TestCacheSet(t *testing.T) {
cache := newTestStatter()
backend := newTestStatter()
st := NewCachedBlobStatter(cache, backend)
ctx := context.Background()
dgst := digest.Digest("dontvalidate")
_, err := st.Stat(ctx, dgst)
if err != distribution.ErrBlobUnknown {
t.Fatalf("Unexpected error %v, expected %v", err, distribution.ErrBlobUnknown)
}
desc := distribution.Descriptor{
Digest: dgst,
}
if err := backend.SetDescriptor(ctx, dgst, desc); err != nil {
t.Fatal(err)
}
actual, err := st.Stat(ctx, dgst)
if err != nil {
t.Fatal(err)
}
if actual.Digest != desc.Digest {
t.Fatalf("Unexpected descriptor %v, expected %v", actual, desc)
}
if len(cache.sets) != 1 || len(cache.sets[dgst]) == 0 {
t.Fatalf("Expected cache set")
}
if cache.sets[dgst][0].Digest != desc.Digest {
t.Fatalf("Unexpected descriptor %v, expected %v", cache.sets[dgst][0], desc)
}
desc2 := distribution.Descriptor{
Digest: digest.Digest("dontvalidate 2"),
}
cache.sets[dgst] = append(cache.sets[dgst], desc2)
actual, err = st.Stat(ctx, dgst)
if err != nil {
t.Fatal(err)
}
if actual.Digest != desc2.Digest {
t.Fatalf("Unexpected descriptor %v, expected %v", actual, desc)
}
}
func TestCacheError(t *testing.T) {
cache := newErrTestStatter(errors.New("cache error"))
backend := newTestStatter()
st := NewCachedBlobStatter(cache, backend)
ctx := context.Background()
dgst := digest.Digest("dontvalidate")
_, err := st.Stat(ctx, dgst)
if err != distribution.ErrBlobUnknown {
t.Fatalf("Unexpected error %v, expected %v", err, distribution.ErrBlobUnknown)
}
desc := distribution.Descriptor{
Digest: dgst,
}
if err := backend.SetDescriptor(ctx, dgst, desc); err != nil {
t.Fatal(err)
}
actual, err := st.Stat(ctx, dgst)
if err != nil {
t.Fatal(err)
}
if actual.Digest != desc.Digest {
t.Fatalf("Unexpected descriptor %v, expected %v", actual, desc)
}
if len(cache.sets) > 0 {
t.Fatalf("Set should not be called after stat error")
}
}
func newTestStatter() *testStatter {
return &testStatter{
stats: []digest.Digest{},
sets: map[digest.Digest][]distribution.Descriptor{},
}
}
func newErrTestStatter(err error) *testStatter {
return &testStatter{
sets: map[digest.Digest][]distribution.Descriptor{},
err: err,
}
}
type testStatter struct {
stats []digest.Digest
sets map[digest.Digest][]distribution.Descriptor
err error
}
func (s *testStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
if s.err != nil {
return distribution.Descriptor{}, s.err
}
if set := s.sets[dgst]; len(set) > 0 {
return set[len(set)-1], nil
}
return distribution.Descriptor{}, distribution.ErrBlobUnknown
}
func (s *testStatter) SetDescriptor(ctx context.Context, dgst digest.Digest, desc distribution.Descriptor) error {
s.sets[dgst] = append(s.sets[dgst], desc)
return s.err
}
func (s *testStatter) Clear(ctx context.Context, dgst digest.Digest) error {
return s.err
}