ro_test.go

Documentation: github.com/google/go-containerregistry/pkg/v1/cache

     1  // Copyright 2021 Google LLC All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cache
    16  
    17  import (
    18  	"testing"
    19  
    20  	v1 "github.com/google/go-containerregistry/pkg/v1"
    21  	"github.com/google/go-containerregistry/pkg/v1/random"
    22  )
    23  
    24  func TestReadOnly(t *testing.T) {
    25  	m := &memcache{map[v1.Hash]v1.Layer{}}
    26  	ro := ReadOnly(m)
    27  
    28  	// Populate the cache.
    29  	img, err := random.Image(10, 1)
    30  	if err != nil {
    31  		t.Fatalf("random.Image: %v", err)
    32  	}
    33  	img = Image(img, m)
    34  	ls, err := img.Layers()
    35  	if err != nil {
    36  		t.Fatalf("Layers: %v", err)
    37  	}
    38  	if got, want := len(ls), 1; got != want {
    39  		t.Fatalf("Layers returned %d layers, want %d", got, want)
    40  	}
    41  	h, err := ls[0].Digest()
    42  	if err != nil {
    43  		t.Fatalf("layer.Digest: %v", err)
    44  	}
    45  	m.m[h] = ls[0]
    46  
    47  	// Layer can be read from original cache and RO cache.
    48  	if _, err := m.Get(h); err != nil {
    49  		t.Fatalf("m.Get: %v", err)
    50  	}
    51  	if _, err := ro.Get(h); err != nil {
    52  		t.Fatalf("ro.Get: %v", err)
    53  	}
    54  	ln := len(m.m)
    55  
    56  	// RO Put is a no-op.
    57  	if _, err := ro.Put(ls[0]); err != nil {
    58  		t.Fatalf("ro.Put: %v", err)
    59  	}
    60  	if got, want := len(m.m), ln; got != want {
    61  		t.Errorf("After Put, got %v entries, want %v", got, want)
    62  	}
    63  
    64  	// RO Delete is a no-op.
    65  	if err := ro.Delete(h); err != nil {
    66  		t.Fatalf("ro.Delete: %v", err)
    67  	}
    68  	if got, want := len(m.m), ln; got != want {
    69  		t.Errorf("After Delete, got %v entries, want %v", got, want)
    70  	}
    71  
    72  	// Deleting from the underlying RW cache updates RO view.
    73  	if err := m.Delete(h); err != nil {
    74  		t.Fatalf("m.Delete: %v", err)
    75  	}
    76  	if got, want := len(m.m), 0; got != want {
    77  		t.Errorf("After RW Delete, got %v entries, want %v", got, want)
    78  	}
    79  }
    80
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