public async Task <Counter> ProcessRequestAsync(ThrottlerItem throttlerItem, ThrottleRule rule, CancellationToken cancellationToken)
{
Counter counter;
using (await _asyncLock.WriterLockAsync(throttlerItem.GenerateCounterKey()))
{
var entry = await _counterStore.GetAsync(throttlerItem, cancellationToken);
if (entry.HasValue)
{
// entry has not expired
if (entry.Value.Timestamp + rule.TimeWindow >= _systemClock.UtcNow)
{
// increment request count
var totalCount = entry.Value.Count + 1;
counter = new Counter(entry.Value.Timestamp, totalCount);
}
else
{
counter = new Counter(_systemClock.UtcNow, 1);
}
}
else
{
counter = new Counter(_systemClock.UtcNow, 1);
}
await _counterStore.SetAsync(throttlerItem, counter, rule.TimeWindow, cancellationToken);
}
return(counter);
}
public virtual string GenerateThrottlerItemKey(ThrottlerItem throttlerItem)
{
return(throttlerItem.GenerateCounterKey("Throttler"));
}