protected override async Task <HttpResponseMessage> SendRequestAsync(IRequestInfo request, bool readBody)
{
var bucketId = GenerateBucketId(request);
while (true)
{
await _rateLimiter.EnterLockAsync(bucketId, request.CancellationToken).ConfigureAwait(false);
bool allowAnyStatus = request.AllowAnyStatusCode;
((RequestInfo)request).AllowAnyStatusCode = true;
var response = await base.SendRequestAsync(request, readBody).ConfigureAwait(false);
var info = new RateLimitInfo(response.Headers);
if (response.IsSuccessStatusCode)
{
_rateLimiter.UpdateLimit(bucketId, info);
return(response);
}
switch (response.StatusCode)
{
case (HttpStatusCode)429:
_rateLimiter.UpdateLimit(bucketId, info);
continue;
case HttpStatusCode.BadGateway: //502
await Task.Delay(250, request.CancellationToken).ConfigureAwait(false);
continue;
default:
if (allowAnyStatus)
{
return(response);
}
// TODO: Does this allocate?
var bytes = await response.Content.ReadAsByteArrayAsync().ConfigureAwait(false);
if (bytes.Length > 0)
{
RestError error = null;
try { error = _serializer.Read <RestError>(bytes.AsSpan()); } catch { }
if (error != null)
{
throw new TwitchRestException(response.StatusCode, error.Status, error.Message);
}
Utf8String msg = null;
try { msg = new Utf8String(bytes); } catch { }
if (!(msg is null))
{
throw new TwitchRestException(response.StatusCode, null, msg);
}
}
throw new TwitchRestException(response.StatusCode);
}
}
}
public void UpdateRateLimit(RateLimitInfo info)
{
if (WindowCount == 0)
{
return;
}
lock (_lock)
{
bool hasQueuedReset = _resetsAt != null;
if (info.Limit.HasValue && WindowCount != info.Limit.Value)
{
WindowCount = info.Limit.Value;
_semaphore = info.Remaining.Value;
}
long now = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
DateTimeOffset?resetsAt = null;
//Using X-RateLimit-Remaining causes a race condition
/*if (info.Remaining.HasValue)
* _semaphore = info.Remaining.Value;*/
if (info.Reset.HasValue) //Secs
{
resetsAt = info.Reset.Value.AddSeconds(info.Lag?.TotalSeconds ?? 1.0);
}
if (resetsAt == null)
{
WindowCount = 0; //No rate limit info, disable limits on this bucket (should only ever happen with a user token)
return;
}
if (!hasQueuedReset || resetsAt > _resetsAt)
{
_resetsAt = resetsAt;
LastAttemptAt = resetsAt.Value; //Make sure we dont destroy this until after its been reset
if (!hasQueuedReset)
{
int millis = (int)Math.Ceiling((_resetsAt.Value - DateTimeOffset.UtcNow).TotalMilliseconds);
var _ = QueueReset(millis);
}
}
}
}
public virtual void UpdateLimit(string bucketId, RateLimitInfo info)
{
var bucket = _buckets.GetOrAdd(bucketId, x => new RequestBucket(this));
bucket.UpdateRateLimit(info);
}
