io/ratelimit: add test

pkgs/io/ratelimit/limiter.go

@@ -24,7 +24,7 @@ func NewLimiter(size uint64) *Limiter {
 	}
 }
 
-// WaitToTake allow you take data
+// Wait allow you take data
 func (l *Limiter) Wait(size uint64) {
 	var s uint64
 	s = size
@@ -58,3 +58,11 @@ func (l *Limiter) Try(size uint64) (ok bool, remainingCount uint64, waitTime tim
 	l.now += reamining
 	return false, size - reamining, l.duration - now.Sub(l.last)
 }
+
+// reset internal for test only
+func (l *Limiter) reset() {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	l.now = 0
+}

pkgs/io/ratelimit/readwrite_test.go

@@ -0,0 +1,100 @@
+package ratelimit
+
+import (
+	"io"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type dummyReadWriter struct {
+	closed atomic.Bool
+}
+
+func (r *dummyReadWriter) Close() error {
+	r.closed.Store(true)
+	return nil
+}
+
+func (r *dummyReadWriter) Read(p []byte) (int, error) {
+	if r.closed.Load() {
+		return 0, io.ErrUnexpectedEOF
+	}
+
+	return 1, nil
+}
+
+func (r *dummyReadWriter) Write(p []byte) (int, error) {
+	if r.closed.Load() {
+		return 0, io.ErrUnexpectedEOF
+	}
+
+	return 1, nil
+}
+
+func TestRateLimitReadWriteCloserRead(t *testing.T) {
+	data := make([]byte, 1024)
+	limit := 1024
+	limited := NewRateLimitReaderWriterCloser(&dummyReadWriter{}, uint64(limit))
+
+	start := time.Now()
+	for i := 0; i < limit; i++ {
+		_, err := limited.Read(data)
+		assert.NoError(t, err)
+	}
+
+	if time.Now().Sub(start) >= time.Second {
+		t.Error("The limiter blocked when it shouldn't have")
+	}
+
+	_, _ = limited.Read(data)
+
+	if time.Now().Sub(start) <= time.Second {
+		t.Error("The limiter didn't block when it should have")
+	}
+}
+
+func TestRateLimitReadWriteCloserWrite(t *testing.T) {
+	data := make([]byte, 1024)
+	limit := 1024
+	limited := NewRateLimitReaderWriterCloser(&dummyReadWriter{}, uint64(limit))
+
+	start := time.Now()
+
+	limited.(*RateLimitReadWriteCloser).limiter.reset()
+
+	for i := 0; i < limit; i++ {
+		_, err := limited.Write(data)
+		assert.NoError(t, err)
+	}
+
+	_, _ = limited.Write(data)
+
+	if time.Now().Sub(start) <= time.Second {
+		t.Error("The limiter didn't block when it should have")
+	}
+}
+
+func TestRateLimitReadWriteCloserReadAndWrite(t *testing.T) {
+	data := make([]byte, 1024)
+	limit := 1024
+	limited := NewRateLimitReaderWriterCloser(&dummyReadWriter{}, uint64(limit))
+
+	start := time.Now()
+
+	for i := 0; i < limit; i++ {
+		var err error
+		if i%2 == 0 {
+			_, err = limited.Read(data)
+		} else {
+			_, err = limited.Write(data)
+		}
+		assert.NoError(t, err)
+	}
+
+	if time.Now().Sub(start) >= time.Second {
+		t.Error("The limiter blocked when it shouldn't have")
+	}
+}