-// MockVolumes are test doubles for Volumes, used to test handlers.
-type MockVolume struct {
- Store map[string][]byte
- Timestamps map[string]time.Time
-
- // Bad volumes return an error for every operation.
- Bad bool
- BadVolumeError error
-
- // Touchable volumes' Touch() method succeeds for a locator
- // that has been Put().
- Touchable bool
-
- // Readonly volumes return an error for Put, Delete, and
- // Touch.
- Readonly bool
-
- // Gate is a "starting gate", allowing test cases to pause
- // volume operations long enough to inspect state. Every
- // operation (except Status) starts by receiving from
- // Gate. Sending one value unblocks one operation; closing the
- // channel unblocks all operations. By default, Gate is a
- // closed channel, so all operations proceed without
- // blocking. See trash_worker_test.go for an example.
- Gate chan struct{}
-
- called map[string]int
- mutex sync.Mutex
-}
-
-// CreateMockVolume returns a non-Bad, non-Readonly, Touchable mock
-// volume.
-func CreateMockVolume() *MockVolume {
- gate := make(chan struct{})
- close(gate)
- return &MockVolume{
- Store: make(map[string][]byte),
- Timestamps: make(map[string]time.Time),
- Bad: false,
- Touchable: true,
- Readonly: false,
- called: map[string]int{},
- Gate: gate,
- }
-}
-
-// CallCount returns how many times the named method has been called.
-func (v *MockVolume) CallCount(method string) int {
- v.mutex.Lock()
- defer v.mutex.Unlock()
- c, ok := v.called[method]
- if !ok {
- return 0
- }
- return c
-}
-
-func (v *MockVolume) gotCall(method string) {
- v.mutex.Lock()
- defer v.mutex.Unlock()
- if _, ok := v.called[method]; !ok {
- v.called[method] = 1
- } else {
- v.called[method]++
- }
-}
-
-func (v *MockVolume) Compare(ctx context.Context, loc string, buf []byte) error {
- v.gotCall("Compare")
- <-v.Gate
- if v.Bad {
- return v.BadVolumeError
- } else if block, ok := v.Store[loc]; ok {
- if fmt.Sprintf("%x", md5.Sum(block)) != loc {
- return DiskHashError
- }
- if bytes.Compare(buf, block) != 0 {
- return CollisionError
- }
- return nil
- } else {
- return NotFoundError
- }
-}
-
-func (v *MockVolume) Get(ctx context.Context, loc string, buf []byte) (int, error) {
- v.gotCall("Get")
- <-v.Gate
- if v.Bad {
- return 0, v.BadVolumeError
- } else if block, ok := v.Store[loc]; ok {
- copy(buf[:len(block)], block)
- return len(block), nil
- }
- return 0, os.ErrNotExist
-}
-
-func (v *MockVolume) Put(ctx context.Context, loc string, block []byte) error {
- v.gotCall("Put")
- <-v.Gate
- if v.Bad {
- return v.BadVolumeError
- }
- if v.Readonly {
- return MethodDisabledError
- }
- v.Store[loc] = block
- return v.Touch(loc)
-}
-
-func (v *MockVolume) Touch(loc string) error {
- v.gotCall("Touch")
- <-v.Gate
- if v.Readonly {
- return MethodDisabledError
- }
- if v.Touchable {
- v.Timestamps[loc] = time.Now()
- return nil
- }
- return errors.New("Touch failed")