cloudflared-mirror/origin/backoffhandler_test.go

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package origin
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) {
// make backoff return immediately
timeAfter = immediateTimeAfter
ctx := context.Background()
backoff := BackoffHandler{MaxRetries: 3}
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) {
// prevent backoff from returning normally
timeAfter = func(time.Duration) <-chan time.Time { return make(chan time.Time) }
ctx, cancelFunc := context.WithCancel(context.Background())
backoff := BackoffHandler{MaxRetries: 3}
cancelFunc()
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after cancel")
}
if _, ok := backoff.GetBackoffDuration(ctx); ok {
t.Fatalf("backoff allowed after cancel")
}
}
func TestBackoffGracePeriod(t *testing.T) {
currentTime := time.Now()
// make timeNow return whatever we like
timeNow = func() time.Time { return currentTime }
// make backoff return immediately
timeAfter = immediateTimeAfter
ctx := context.Background()
backoff := BackoffHandler{MaxRetries: 1}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff failed immediately")
}
// the next call to Backoff would fail unless it's after the grace period
backoff.SetGracePeriod()
// advance time to after the grace period (~4 seconds) and see what happens
currentTime = currentTime.Add(time.Second * 5)
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 TestGetBackoffDurationRetries(t *testing.T) {
// make backoff return immediately
timeAfter = immediateTimeAfter
ctx := context.Background()
backoff := BackoffHandler{MaxRetries: 3}
if _, ok := backoff.GetBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed immediately")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed after 1 retry")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetBackoffDuration(ctx); !ok {
t.Fatalf("backoff failed after 2 retry")
}
backoff.Backoff(ctx) // noop
if _, ok := backoff.GetBackoffDuration(ctx); ok {
t.Fatalf("backoff allowed after 3 (max) retries")
}
if backoff.Backoff(ctx) {
t.Fatalf("backoff allowed after 3 (max) retries")
}
}
func TestGetBackoffDuration(t *testing.T) {
// make backoff return immediately
timeAfter = immediateTimeAfter
ctx := context.Background()
backoff := BackoffHandler{MaxRetries: 3}
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second {
t.Fatalf("backoff didn't return 1 second on first retry")
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*2 {
t.Fatalf("backoff didn't return 2 seconds on second retry")
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*4 {
t.Fatalf("backoff didn't return 4 seconds on third retry")
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetBackoffDuration(ctx); ok || duration != 0 {
t.Fatalf("backoff didn't return 0 seconds on fourth retry (exceeding limit)")
}
}
func TestBackoffRetryForever(t *testing.T) {
// make backoff return immediately
timeAfter = immediateTimeAfter
ctx := context.Background()
backoff := BackoffHandler{MaxRetries: 3, RetryForever: true}
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second {
t.Fatalf("backoff didn't return 1 second on first retry")
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*2 {
t.Fatalf("backoff didn't return 2 seconds on second retry")
}
backoff.Backoff(ctx) // noop
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*4 {
t.Fatalf("backoff didn't return 4 seconds on third retry")
}
if !backoff.Backoff(ctx) {
t.Fatalf("backoff refused on fourth retry despire RetryForever")
}
if duration, ok := backoff.GetBackoffDuration(ctx); !ok || duration != time.Second*8 {
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.GetBackoffDuration(ctx); !ok || duration != time.Second*8 {
t.Fatalf("backoff returned %v instead of 8 seconds on fifth retry", duration)
}
}