private void OnEnter(object sender, EventArgs e)
{
var context = ((HttpApplication)sender).Context;
if (context.Error != null ||
context.CurrentHandler == null ||
context.CurrentHandler is DefaultHttpHandler)
{
return;
}
var cache = new WebCache(context.Cache);
var request = context.Request;
foreach (var ip in request.UserHosts())
{
var key = KeyPrefix + ip;
if (cache.Increment(key, ThrottlePeriod) >= RateQuota)
{
if (NoExceptionPathRegex == null ||
!NoExceptionPathRegex.IsMatch(request.RawUrl))
{
throw new LimitExceededException(string.Format(CultureInfo.InvariantCulture,
"The maximum quota for incoming requests ({0} queries per {1}) has been exceeded.",
RateQuota,
TimeSpanHelper.ToLongTimeString(ThrottlePeriod).ToLowerInvariant()));
}
}
}
}