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retry_test.go
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retry_test.go
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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)
}
}