public void SendsNothingWhenMaxReqIsZero()
{
var sender = new RateLimiterZipkinSender(_underlyingSender.Object, 0);
sender.Send(_data);
_underlyingSender.Verify(zipkinSender => zipkinSender.Send(It.Is <byte[]>(bytes => bytes == _data)), Times.Never());
}
public void ShouldLogAtLeastOnceWhenMaxReqIsZero()
{
var duration = TimeSpan.FromMilliseconds(10);
var sender = new RateLimiterZipkinSender(_underlyingSender.Object, 0, duration);
sender.Send(_data);
Thread.Sleep(TimeSpan.FromMilliseconds(duration.TotalMilliseconds * 10 * 1.05));
sender.Send(_data);
_logger.Verify(logger => logger.LogWarning(It.IsAny <string>()), Times.AtLeastOnce());
}
public void RequestsAreNotThrottledIfMaxReqIsNotReached(int maxReq)
{
var sender = new RateLimiterZipkinSender(_underlyingSender.Object, maxReq, TimeSpan.FromSeconds(5));
for (var i = 0; i < maxReq + 1; i++)
{
sender.Send(_data);
}
_underlyingSender.Verify(zipkinSender => zipkinSender.Send(It.Is <byte[]>(bytes => bytes == _data)), Times.Exactly(maxReq));
}
public void ExcessiveRequestsAreThrottledOnLongTerm(int maxSendRequest, int perSpanMs, int numberOfSpan)
{
var perSpan = TimeSpan.FromMilliseconds(perSpanMs);
var sender = new RateLimiterZipkinSender(_underlyingSender.Object, maxSendRequest, perSpan);
var watch = Stopwatch.StartNew();
while (true)
{
if (watch.ElapsedMilliseconds >= perSpan.TotalMilliseconds * numberOfSpan)
{
break;
}
sender.Send(_data);
}
var tolerance = 1.5 / numberOfSpan + 1.05;
var trueSendExpect = numberOfSpan * maxSendRequest;
var sendExpectationWithBurstTolerance = (int)Math.Ceiling(trueSendExpect * tolerance);
_underlyingSender.Verify(zipkinSender => zipkinSender.Send(It.Is <byte[]>(bytes => bytes == _data)), Times.AtMost(sendExpectationWithBurstTolerance));
}
