public Task <ThrottleCounter> IncrementAsync(string key, ThrottleRequirement requirement, long incrementValue = 1, bool reachLimitAtMax = false)
{
bool limitReached = false;
ThrottleCounterEntry entry = _cache.Get <ThrottleCounterEntry>(key);
if (entry == null)
{
entry = new ThrottleCounterEntry
{
Reset = _clock.UtcNow.Add(requirement.RenewalPeriod),
Value = incrementValue
};
}
else
{
var value = entry.Value + incrementValue;
if (value > requirement.MaxValue || (reachLimitAtMax && value == requirement.MaxValue))
{
limitReached = true;
}
entry.Value = value;
if (requirement.Sliding)
{
entry.Reset = _clock.UtcNow.Add(requirement.RenewalPeriod);
}
}
_cache.Set(key, entry, entry.Reset);
var counter = new ThrottleCounter(entry.Reset, entry.Value, limitReached);
return(Task.FromResult(counter));
}
public override void AddRateLimitHeaders(ThrottleCounter counter, ThrottleContext throttleContext, IPSessionRateLimitRequirement requirement)
{
if (counter == null)
{
throw new ArgumentNullException(nameof(counter));
}
if (throttleContext == null)
{
throw new ArgumentNullException(nameof(throttleContext));
}
if (requirement == null)
{
throw new ArgumentNullException(nameof(requirement));
}
throttleContext.ResponseHeaders["X-RateLimit-IPLimit"] = requirement.MaxValue.ToString();
throttleContext.ResponseHeaders["X-RateLimit-IPRemaining"] = counter.Remaining(requirement).ToString();
}
public Task <ThrottleCounter> GetAsync(string key, ThrottleRequirement requirement)
{
ThrottleCounter counter;
ThrottleCounterEntry item = _cache.Get <ThrottleCounterEntry>(key);
if (item == null)
{
counter = new ThrottleCounter(_clock.UtcNow.Add(requirement.RenewalPeriod));
}
else
{
bool limitReached = false;
if (item.Value >= requirement.MaxValue)
{
limitReached = true;
}
counter = new ThrottleCounter(item.Reset, item.Value, limitReached);
}
return(Task.FromResult(counter));
}
public abstract void AddRateLimitHeaders(ThrottleCounter counter, ThrottleContext throttleContext, TRequirement requirement);