public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
int rateBytesPerSecond = Convert.ToInt32(_tokenBucket.Rate);
if (rateBytesPerSecond <= 0)
{
_innerStream.Write(buffer, offset, count);
return;
}
int tempCountBytes = count;
// In the unlikely event that the count is greater than the rate (i.e. buffer
// is 16KB (typically this is the max size) and the rate is < 16Kbs), we'll need
// to split it into multiple.
TimeSpan wait;
while (tempCountBytes > rateBytesPerSecond)
{
if (_tokenBucket.ShouldThrottle(tempCountBytes, out wait))
{
if (wait > TimeSpan.Zero)
{
await Task.Delay(wait, cancellationToken).ConfigureAwait(false);
}
}
await _innerStream.WriteAsync(buffer, offset, rateBytesPerSecond, cancellationToken)
.ConfigureAwait(false);
offset += rateBytesPerSecond;
tempCountBytes -= rateBytesPerSecond;
}
while (_tokenBucket.ShouldThrottle(tempCountBytes, out wait))
{
if (wait > TimeSpan.Zero)
{
await Task.Delay(wait, cancellationToken).ConfigureAwait(false);
}
}
await _innerStream.WriteAsync(buffer, offset, tempCountBytes, cancellationToken)
.ConfigureAwait(false);
}
public void Limit()
{
while (true)
{
if (!bucket.ShouldThrottle(1))
{
break;
}
Thread.Sleep(100);
}
}
public void ShouldThrottle_WhenCalledWithNTokensLessThanMax_ReturnsFalse()
{
TimeSpan waitTime;
var shouldThrottle = bucket.ShouldThrottle(N_LESS_THAN_MAX, out waitTime);
Assert.False(shouldThrottle);
Assert.Equal(bucket.CurrentTokenCount, MAX_TOKENS - N_LESS_THAN_MAX);
}
public void ShouldThrottle_WhenCalledWithNTokensLessThanMax_ReturnsFalse()
{
var shouldThrottle = bucket.ShouldThrottle(N_LESS_THAN_MAX, out _);
Assert.That(shouldThrottle, Is.False);
Assert.That(bucket.CurrentTokenCount, Is.EqualTo(MAX_TOKENS - N_LESS_THAN_MAX));
}
public void ShouldThrottle_WhenCalledWithNTokensLessThanMax_ReturnsFalse()
{
TimeSpan waitTime;
bool shouldThrottle = _bucket.ShouldThrottle(N_LESS_THAN_MAX, out waitTime);
shouldThrottle.ShouldBeFalse();
_bucket.CurrentTokenCount.ShouldBe(MAX_TOKENS - N_LESS_THAN_MAX);
}