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package backoff import ( "context" "errors" "fmt" "io" "log" "testing" "time" ) type testTimer struct { timer *time.Timer } func (t *testTimer) Start(duration time.Duration) { t.timer = time.NewTimer(0) } func (t *testTimer) Stop() { if t.timer != nil { t.timer.Stop() } } func (t *testTimer) C() <-chan time.Time { return t.timer.C } func TestRetry(t *testing.T) { const successOn = 3 var i = 0 // This function is successful on "successOn" calls. f := func() error { i++ log.Printf("function is called %d. time\n", i) if i == successOn { log.Println("OK") return nil } log.Println("error") return errors.New("error") } err := RetryNotifyWithTimer(f, NewExponentialBackOff(), nil, &testTimer{}) if err != nil { t.Errorf("unexpected error: %s", err.Error()) } if i != successOn { t.Errorf("invalid number of retries: %d", i) } } func TestRetryWithData(t *testing.T) { const successOn = 3 var i = 0 // This function is successful on "successOn" calls. f := func() (int, error) { i++ log.Printf("function is called %d. time\n", i) if i == successOn { log.Println("OK") return 42, nil } log.Println("error") return 1, errors.New("error") } res, err := RetryNotifyWithTimerAndData(f, NewExponentialBackOff(), nil, &testTimer{}) if err != nil { t.Errorf("unexpected error: %s", err.Error()) } if i != successOn { t.Errorf("invalid number of retries: %d", i) } if res != 42 { t.Errorf("invalid data in response: %d, expected 42", res) } } func TestRetryContext(t *testing.T) { var cancelOn = 3 var i = 0 ctx, cancel := context.WithCancel(context.Background()) defer cancel() // This function cancels context on "cancelOn" calls. f := func() error { i++ log.Printf("function is called %d. time\n", i) // cancelling the context in the operation function is not a typical // use-case, however it allows to get predictable test results. if i == cancelOn { cancel() } log.Println("error") return fmt.Errorf("error (%d)", i) } err := RetryNotifyWithTimer(f, WithContext(NewConstantBackOff(time.Millisecond), ctx), nil, &testTimer{}) if err == nil { t.Errorf("error is unexpectedly nil") } if !errors.Is(err, context.Canceled) { t.Errorf("unexpected error: %s", err.Error()) } if i != cancelOn { t.Errorf("invalid number of retries: %d", i) } } func TestRetryPermanent(t *testing.T) { ensureRetries := func(test string, shouldRetry bool, f func() (int, error), expectRes int) { numRetries := -1 maxRetries := 1 res, _ := RetryNotifyWithTimerAndData( func() (int, error) { numRetries++ if numRetries >= maxRetries { return -1, Permanent(errors.New("forced")) } return f() }, NewExponentialBackOff(), nil, &testTimer{}, ) if shouldRetry && numRetries == 0 { t.Errorf("Test: '%s', backoff should have retried", test) } if !shouldRetry && numRetries > 0 { t.Errorf("Test: '%s', backoff should not have retried", test) } if res != expectRes { t.Errorf("Test: '%s', got res %d but expected %d", test, res, expectRes) } } for _, testCase := range []struct { name string f func() (int, error) shouldRetry bool res int }{ { "nil test", func() (int, error) { return 1, nil }, false, 1, }, { "io.EOF", func() (int, error) { return 2, io.EOF }, true, -1, }, { "Permanent(io.EOF)", func() (int, error) { return 3, Permanent(io.EOF) }, false, 3, }, { "Wrapped: Permanent(io.EOF)", func() (int, error) { return 4, fmt.Errorf("Wrapped error: %w", Permanent(io.EOF)) }, false, 4, }, } { ensureRetries(testCase.name, testCase.shouldRetry, testCase.f, testCase.res) } } func TestPermanent(t *testing.T) { want := errors.New("foo") other := errors.New("bar") var err error = Permanent(want) got := errors.Unwrap(err) if got != want { t.Errorf("got %v, want %v", got, want) } if is := errors.Is(err, want); !is { t.Errorf("err: %v is not %v", err, want) } if is := errors.Is(err, other); is { t.Errorf("err: %v is %v", err, other) } wrapped := fmt.Errorf("wrapped: %w", err) var permanent *PermanentError if !errors.As(wrapped, &permanent) { t.Errorf("errors.As(%v, %v)", wrapped, permanent) } err = Permanent(nil) if err != nil { t.Errorf("got %v, want nil", err) } }