|
| 1 | +package parallel |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "errors" |
| 6 | + "fmt" |
| 7 | + "log" |
| 8 | + "reflect" |
| 9 | + "regexp" |
| 10 | + "testing" |
| 11 | + "time" |
| 12 | + |
| 13 | + "github.com/openshift/cluster-version-operator/pkg/verify/store" |
| 14 | + "github.com/openshift/cluster-version-operator/pkg/verify/store/memory" |
| 15 | +) |
| 16 | + |
| 17 | +// delay wraps a store and introduces a delay before each callback. |
| 18 | +type delay struct { |
| 19 | + store store.Store |
| 20 | + delay time.Duration |
| 21 | +} |
| 22 | + |
| 23 | +// Signatures fetches signatures for the provided digest. |
| 24 | +func (s *delay) Signatures(ctx context.Context, name string, digest string, fn store.Callback) error { |
| 25 | + nestedCtx, cancel := context.WithCancel(ctx) |
| 26 | + defer cancel() |
| 27 | + responses := make(chan *signatureResponse, 1) |
| 28 | + go func(ctx context.Context, name string, digest string, responses chan *signatureResponse) { |
| 29 | + err := s.store.Signatures(ctx, name, digest, func(ctx context.Context, signature []byte, errIn error) (done bool, err error) { |
| 30 | + select { |
| 31 | + case <-ctx.Done(): |
| 32 | + return true, nil |
| 33 | + case responses <- &signatureResponse{signature: signature, errIn: errIn}: |
| 34 | + log.Printf("queued response: %s", string(signature)) |
| 35 | + } |
| 36 | + return false, nil |
| 37 | + }) |
| 38 | + if err != nil && err != context.Canceled && err != context.DeadlineExceeded { |
| 39 | + log.Fatal(err) |
| 40 | + } |
| 41 | + select { |
| 42 | + case <-ctx.Done(): |
| 43 | + case responses <- nil: |
| 44 | + } |
| 45 | + close(responses) |
| 46 | + return |
| 47 | + }(nestedCtx, name, digest, responses) |
| 48 | + |
| 49 | + for { |
| 50 | + time.Sleep(s.delay) |
| 51 | + select { |
| 52 | + case <-ctx.Done(): |
| 53 | + return ctx.Err() |
| 54 | + case response := <-responses: |
| 55 | + if response == nil { |
| 56 | + return nil |
| 57 | + } |
| 58 | + log.Printf("sent response: %s", string(response.signature)) |
| 59 | + done, err := fn(ctx, response.signature, response.errIn) |
| 60 | + if done || err != nil { |
| 61 | + return err |
| 62 | + } |
| 63 | + } |
| 64 | + } |
| 65 | + |
| 66 | + return nil |
| 67 | +} |
| 68 | + |
| 69 | +// String returns a description of where this store finds |
| 70 | +// signatures. |
| 71 | +func (s *delay) String() string { |
| 72 | + return fmt.Sprintf("delay signature store wrapping %s with a delay of %s", s.store, s.delay) |
| 73 | +} |
| 74 | + |
| 75 | +func TestStore(t *testing.T) { |
| 76 | + ctx := context.Background() |
| 77 | + parallel := &Store{ |
| 78 | + Stores: []store.Store{ |
| 79 | + &delay{ |
| 80 | + store: &memory.Store{ |
| 81 | + Data: map[string][][]byte{ |
| 82 | + "sha256:123": { |
| 83 | + []byte("store-1-sig-1"), |
| 84 | + []byte("store-1-sig-2"), |
| 85 | + }, |
| 86 | + }, |
| 87 | + }, |
| 88 | + delay: 200 * time.Millisecond, |
| 89 | + }, |
| 90 | + &delay{ |
| 91 | + store: &memory.Store{ |
| 92 | + Data: map[string][][]byte{ |
| 93 | + "sha256:123": { |
| 94 | + []byte("store-2-sig-1"), |
| 95 | + []byte("store-2-sig-2"), |
| 96 | + }, |
| 97 | + }, |
| 98 | + }, |
| 99 | + delay: 300 * time.Millisecond, |
| 100 | + }, |
| 101 | + }, |
| 102 | + } |
| 103 | + |
| 104 | + for _, testCase := range []struct { |
| 105 | + name string |
| 106 | + doneSignature string |
| 107 | + doneError error |
| 108 | + expectedSignatures []string |
| 109 | + expectedError *regexp.Regexp |
| 110 | + }{ |
| 111 | + { |
| 112 | + name: "all", |
| 113 | + expectedSignatures: []string{ |
| 114 | + "store-1-sig-1", // 200 ms |
| 115 | + "store-2-sig-1", // 300 ms |
| 116 | + "store-1-sig-2", // 400 ms |
| 117 | + "store-2-sig-2", // 600 ms |
| 118 | + }, |
| 119 | + }, |
| 120 | + { |
| 121 | + name: "done early", |
| 122 | + doneSignature: "store-1-sig-2", |
| 123 | + expectedSignatures: []string{ |
| 124 | + "store-1-sig-1", |
| 125 | + "store-2-sig-1", |
| 126 | + "store-1-sig-2", |
| 127 | + }, |
| 128 | + }, |
| 129 | + { |
| 130 | + name: "error early", |
| 131 | + doneSignature: "store-1-sig-2", |
| 132 | + doneError: errors.New("test error"), |
| 133 | + expectedSignatures: []string{ |
| 134 | + "store-1-sig-1", |
| 135 | + "store-2-sig-1", |
| 136 | + "store-1-sig-2", |
| 137 | + }, |
| 138 | + expectedError: regexp.MustCompile("^test error$"), |
| 139 | + }, |
| 140 | + } { |
| 141 | + t.Run(testCase.name, func(t *testing.T) { |
| 142 | + signatures := []string{} |
| 143 | + err := parallel.Signatures(ctx, "name", "sha256:123", func(ctx context.Context, signature []byte, errIn error) (done bool, err error) { |
| 144 | + if errIn != nil { |
| 145 | + return false, errIn |
| 146 | + } |
| 147 | + signatures = append(signatures, string(signature)) |
| 148 | + if string(signature) == testCase.doneSignature { |
| 149 | + return true, testCase.doneError |
| 150 | + } |
| 151 | + return false, nil |
| 152 | + }) |
| 153 | + if err == nil { |
| 154 | + if testCase.expectedError != nil { |
| 155 | + t.Fatalf("signatures succeeded when we expected %s", testCase.expectedError) |
| 156 | + } |
| 157 | + } else if testCase.expectedError == nil { |
| 158 | + t.Fatalf("signatures failed when we expected success: %v", err) |
| 159 | + } else if !testCase.expectedError.MatchString(err.Error()) { |
| 160 | + t.Fatalf("signatures failed with %v (expected %s)", err, testCase.expectedError) |
| 161 | + } |
| 162 | + |
| 163 | + if !reflect.DeepEqual(signatures, testCase.expectedSignatures) { |
| 164 | + t.Fatalf("signatures gathered %v when we expected %v", signatures, testCase.expectedSignatures) |
| 165 | + } |
| 166 | + }) |
| 167 | + } |
| 168 | +} |
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