public static async Task ProcessRateLimitedAsync(string redisId, ICacheClient cache, Func <Task <RestResponse> > t)
{
string key = $"discord:ratelimit:" + redisId;
Ratelimit rateLimit = await cache.GetAsync <Ratelimit>(key);
if (rateLimit != null)
{
rateLimit.Remaining--;
await cache.UpsertAsync(key, rateLimit);
}
if (!IsRatelimited(rateLimit))
{
var response = await t();
await HandleRateLimit(cache, response, rateLimit, key);
}
}
private static async Task HandleRateLimit(ICacheClient cache, RestResponse rc, Ratelimit ratelimit, string key)
{
if (!IsRatelimited(ratelimit))
{
if (rc.HttpResponseMessage.Headers.Contains("X-RateLimit-Limit"))
{
ratelimit = new Ratelimit();
ratelimit.Remaining = int.Parse(rc.HttpResponseMessage.Headers.GetValues("X-RateLimit-Remaining").ToList().FirstOrDefault());
ratelimit.Limit = int.Parse(rc.HttpResponseMessage.Headers.GetValues("X-RateLimit-Limit").ToList().FirstOrDefault());
ratelimit.Reset = long.Parse(rc.HttpResponseMessage.Headers.GetValues("X-RateLimit-Reset").ToList().FirstOrDefault());
if (rc.HttpResponseMessage.Headers.Contains("X-RateLimit-Global"))
{
ratelimit.Global = int.Parse(rc.HttpResponseMessage.Headers.GetValues("X-RateLimit-Global").ToList().FirstOrDefault());
}
await cache.UpsertAsync(key, ratelimit);
}
}
}
/// <summary>
/// Checks if the ratelimit is valid and/or is expired.
/// </summary>
/// <param name="rl">The instance that is being checked.</param>
/// <returns>Whether the instance is being ratelimited</returns>
public static bool IsRatelimited(Ratelimit rl)
{
return((rl.Global <= 0 || rl.Remaining <= 0) &&
DateTime.UtcNow <= DateTimeOffset.FromUnixTimeSeconds(rl.Reset));
}
private static bool IsRatelimited(Ratelimit rl)
{
return((rl?.Remaining ?? 1) <= 0 && DateTime.UtcNow <= DateTimeOffset.FromUnixTimeSeconds(rl?.Reset ?? 0));
}