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make rate limiter more concurrent-friendly
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| package v1 | ||
|
|
||
| import ( | ||
| "github.com/jonboulle/clockwork" | ||
| "github.com/stretchr/testify/suite" | ||
| "runtime" | ||
| "sync" | ||
| "sync/atomic" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| type TokensBucketTest struct { | ||
| suite.Suite | ||
| } | ||
|
|
||
| func TestTokensBucket(t *testing.T) { | ||
| suite.Run(t, new(TokensBucketTest)) | ||
| } | ||
|
|
||
| func (t *TokensBucketTest) Test_NewTokensBucket() { | ||
| t.Assert().NotNil(NewTokensBucket(10, time.Hour, time.Hour)) | ||
| } | ||
|
|
||
| func (t *TokensBucketTest) new( | ||
| maxRPS uint32, unusedTokenTime, checkTokenTime time.Duration, sleeper sleeper) *TokensBucket { | ||
| bucket := &TokensBucket{ | ||
| maxRPS: maxRPS, | ||
| unusedTokenTime: unusedTokenTime, | ||
| checkTokenTime: checkTokenTime, | ||
| sleep: sleeper, | ||
| } | ||
| runtime.SetFinalizer(bucket, destructBasket) | ||
| return bucket | ||
| } | ||
|
|
||
| func (t *TokensBucketTest) Test_Obtain_NoThrottle() { | ||
| tb := t.new(100, time.Hour, time.Minute, &realSleeper{}) | ||
| start := time.Now() | ||
| for i := 0; i < 100; i++ { | ||
| tb.Obtain("a") | ||
| } | ||
| t.Assert().True(time.Since(start) < time.Second) // check that rate limiter did not perform throttle. | ||
| } | ||
|
|
||
| func (t *TokensBucketTest) Test_Obtain_Sleep() { | ||
| clock := &fakeSleeper{} | ||
| tb := t.new(100, time.Hour, time.Minute, clock) | ||
|
|
||
| var wg sync.WaitGroup | ||
| wg.Add(1) | ||
| go func() { | ||
| for i := 0; i < 301; i++ { | ||
| tb.Obtain("a") | ||
| } | ||
| wg.Done() | ||
| }() | ||
|
|
||
| wg.Wait() | ||
| t.Assert().Equal(3, int(clock.total.Load())) | ||
| } | ||
|
|
||
| func (t *TokensBucketTest) Test_Obtain_AddRPS() { | ||
| clock := clockwork.NewFakeClock() | ||
| tb := t.new(100, time.Hour, time.Minute, clock) | ||
| go tb.deleteUnusedToken() | ||
| tb.Obtain("a") | ||
| clock.Advance(time.Minute * 2) | ||
|
|
||
| item, found := tb.tokens.Load("a") | ||
| t.Require().True(found) | ||
| t.Assert().Equal(1, int(item.(*token).rps.Load())) | ||
| tb.Obtain("a") | ||
| t.Assert().Equal(2, int(item.(*token).rps.Load())) | ||
| } | ||
|
|
||
| type fakeSleeper struct { | ||
| total atomic.Uint32 | ||
| } | ||
|
|
||
| func (s *fakeSleeper) Sleep(time.Duration) { | ||
| s.total.Add(1) | ||
| } |