cloudflared-mirror/retry/backoffhandler_test.go

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package retry
import (
"context"
"testing"
"time"
)
func immediateTimeAfter(time.Duration) <-chan time.Time {
c := make(chan time.Time, 1)
c <- time.Now()
return c
}
func TestBackoffRetries(t *testing.T) {
ctx := context.Background()
// make backoff return immediately
backoff := BackoffHandler{maxRetries: 3, Clock: Clock{time.Now, immediateTimeAfter}}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed immediately")
}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed after 1 retry")
}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed after 2 retry")
}
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after 3 (max) retries")
}
}
func TestBackoffCancel(t *testing.T) {
ctx, cancelFunc := context.WithCancel(context.Background())
// prevent backoff from returning normally
after := func(time.Duration) <-chan time.Time { return make(chan time.Time) }
backoff := BackoffHandler{maxRetries: 3, Clock: Clock{time.Now, after}}
cancelFunc()
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after cancel")
}
if _, ok := backoff.GetMaxBackoffDuration(ctx); ok {
t.Fatalf("backoff allowed after cancel")
}
}
func TestBackoffGracePeriod(t *testing.T) {
ctx := context.Background()
currentTime := time.Now()
// make Clock.Now return whatever we like
now := func() time.Time { return currentTime }
// make backoff return immediately
backoff := BackoffHandler{maxRetries: 1, Clock: Clock{now, immediateTimeAfter}}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed immediately")
}
// the next call to Backoff would fail unless it's after the grace period
gracePeriod := backoff.SetGracePeriod()
// advance time to after the grace period, which at most will be 8 seconds, but we will advance +1 second.
currentTime = currentTime.Add(gracePeriod + time.Second)
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed after the grace period expired")
}
// confirm we ignore grace period after backoff
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after 1 (max) retry")
}
}
func TestGetMaxBackoffDurationRetries(t *testing.T) {
ctx := context.Background()
// make backoff return immediately
backoff := BackoffHandler{maxRetries: 3, Clock: Clock{time.Now, immediateTimeAfter}}
if _, ok := backoff.GetMaxBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed immediately")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetMaxBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed after 1 retry")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetMaxBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed after 2 retry")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetMaxBackoffDuration(ctx); ok {
t.Fatalf("backoff allowed after 3 (max) retries")
}
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after 3 (max) retries")
}
}
func TestGetMaxBackoffDuration(t *testing.T) {
ctx := context.Background()
// make backoff return immediately
backoff := BackoffHandler{maxRetries: 3, Clock: Clock{time.Now, immediateTimeAfter}}
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*2 {
t.Fatalf("backoff (%s) didn't return < 2 seconds on first retry", duration)
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*4 {
t.Fatalf("backoff (%s) didn't return < 4 seconds on second retry", duration)
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*8 {
t.Fatalf("backoff (%s) didn't return < 8 seconds on third retry", duration)
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetMaxBackoffDuration(ctx); ok || duration != 0 {
t.Fatalf("backoff (%s) didn't return 0 seconds on fourth retry (exceeding limit)", duration)
}
}
func TestBackoffRetryForever(t *testing.T) {
ctx := context.Background()
// make backoff return immediately
backoff := BackoffHandler{maxRetries: 3, retryForever: true, Clock: Clock{time.Now, immediateTimeAfter}}
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*2 {
t.Fatalf("backoff (%s) didn't return < 2 seconds on first retry", duration)
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*4 {
t.Fatalf("backoff (%s) didn't return < 4 seconds on second retry", duration)
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*8 {
t.Fatalf("backoff (%s) didn't return < 8 seconds on third retry", duration)
}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff refused on fourth retry despire RetryForever")
}
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*16 {
t.Fatalf("backoff returned %v instead of 8 seconds on fourth retry", duration)
}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff refused on fifth retry despire RetryForever")
}
if duration, ok := backoff.GetMaxBackoffDuration(ctx); !ok || duration > time.Second*16 {
t.Fatalf("backoff returned %v instead of 8 seconds on fifth retry", duration)
}
}