// Copyright 2021 Google LLC All Rights Reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package cache import ( "testing" v1 "github.com/google/go-containerregistry/pkg/v1" "github.com/google/go-containerregistry/pkg/v1/random" ) func TestReadOnly(t *testing.T) { m := &memcache{map[v1.Hash]v1.Layer{}} ro := ReadOnly(m) // Populate the cache. img, err := random.Image(10, 1) if err != nil { t.Fatalf("random.Image: %v", err) } img = Image(img, m) ls, err := img.Layers() if err != nil { t.Fatalf("Layers: %v", err) } if got, want := len(ls), 1; got != want { t.Fatalf("Layers returned %d layers, want %d", got, want) } h, err := ls[0].Digest() if err != nil { t.Fatalf("layer.Digest: %v", err) } m.m[h] = ls[0] // Layer can be read from original cache and RO cache. if _, err := m.Get(h); err != nil { t.Fatalf("m.Get: %v", err) } if _, err := ro.Get(h); err != nil { t.Fatalf("ro.Get: %v", err) } ln := len(m.m) // RO Put is a no-op. if _, err := ro.Put(ls[0]); err != nil { t.Fatalf("ro.Put: %v", err) } if got, want := len(m.m), ln; got != want { t.Errorf("After Put, got %v entries, want %v", got, want) } // RO Delete is a no-op. if err := ro.Delete(h); err != nil { t.Fatalf("ro.Delete: %v", err) } if got, want := len(m.m), ln; got != want { t.Errorf("After Delete, got %v entries, want %v", got, want) } // Deleting from the underlying RW cache updates RO view. if err := m.Delete(h); err != nil { t.Fatalf("m.Delete: %v", err) } if got, want := len(m.m), 0; got != want { t.Errorf("After RW Delete, got %v entries, want %v", got, want) } }