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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| using System.Diagnostics; | ||
| using NUnit.Framework; | ||
|
|
||
| namespace Nexmo.Api.Test.Integration | ||
| { | ||
| [TestFixture] | ||
| public class ThrottleTest | ||
| { | ||
| [Test] | ||
| public void should_rate_limit() | ||
| { | ||
| Configuration.Instance.Settings["appSettings:Nexmo.Api.RequestsPerSecond"] = "1"; | ||
| var watch = new Stopwatch(); | ||
| watch.Start(); | ||
| for (var i = 1; i < 7; i++) | ||
| { | ||
| Account.GetBalance(); | ||
| } | ||
| watch.Stop(); | ||
| Assert.GreaterOrEqual(watch.Elapsed.Seconds, 5); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| // originally from https://github.com/saguiitay/OneDriveRestAPI | ||
|
|
||
| using System.Net.Http; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Nexmo.Api.Request | ||
| { | ||
| internal class ThrottlingMessageHandler : DelegatingHandler | ||
| { | ||
| private readonly TimeSpanSemaphore _execTimeSpanSemaphore; | ||
|
|
||
| public ThrottlingMessageHandler(TimeSpanSemaphore execTimeSpanSemaphore) | ||
| : this(execTimeSpanSemaphore, new HttpClientHandler {AllowAutoRedirect = true}) | ||
| { } | ||
|
|
||
| public ThrottlingMessageHandler(TimeSpanSemaphore execTimeSpanSemaphore, HttpMessageHandler innerHandler) | ||
| : base(innerHandler) | ||
| { | ||
| _execTimeSpanSemaphore = execTimeSpanSemaphore; | ||
| } | ||
|
|
||
| protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) | ||
| { | ||
| return _execTimeSpanSemaphore?.RunAsync(base.SendAsync, request, cancellationToken) ?? base.SendAsync(request, cancellationToken); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| /* | ||
| MIT License | ||
| Copyright (C) 2011 by Joel Fillmore | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| THE SOFTWARE. | ||
| https://github.com/joelfillmore/JFLibrary | ||
| */ | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Nexmo.Api.Request | ||
| { | ||
| /// <summary> | ||
| /// Allows a limited number of acquisitions during a timespan | ||
| /// </summary> | ||
| internal class TimeSpanSemaphore : IDisposable | ||
| { | ||
| private SemaphoreSlim _pool; | ||
|
|
||
| // the time span for the max number of callers | ||
| private TimeSpan _resetSpan; | ||
|
|
||
| // keep track of the release times | ||
| private Queue<DateTime> _releaseTimes; | ||
|
|
||
| // protect release time queue | ||
| private object _queueLock = new object(); | ||
|
|
||
| public TimeSpanSemaphore(int maxCount, TimeSpan resetSpan) | ||
| { | ||
| _pool = new SemaphoreSlim(maxCount, maxCount); | ||
| _resetSpan = resetSpan; | ||
|
|
||
| // initialize queue with old timestamps | ||
| _releaseTimes = new Queue<DateTime>(maxCount); | ||
| for (int i = 0; i < maxCount; i++) | ||
| { | ||
| _releaseTimes.Enqueue(DateTime.MinValue); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Blocks the current thread until it can enter the semaphore, while observing a CancellationToken | ||
| /// </summary> | ||
| private void Wait(CancellationToken cancelToken) | ||
| { | ||
| // will throw if token is cancelled | ||
| _pool.Wait(cancelToken); | ||
|
|
||
| // get the oldest release from the queue | ||
| DateTime oldestRelease; | ||
| lock (_queueLock) | ||
| { | ||
| oldestRelease = _releaseTimes.Dequeue(); | ||
| } | ||
|
|
||
| // sleep until the time since the previous release equals the reset period | ||
| DateTime now = DateTime.UtcNow; | ||
| DateTime windowReset = oldestRelease.Add(_resetSpan); | ||
| if (windowReset > now) | ||
| { | ||
| int sleepMilliseconds = Math.Max( | ||
| (int)(windowReset.Subtract(now).Ticks / TimeSpan.TicksPerMillisecond), | ||
| 1); // sleep at least 1ms to be sure next window has started | ||
| // TODO: log | ||
| //_logger.LogInformation($"Waiting {sleepMilliseconds} ms for TimeSpanSemaphore limit to reset."); | ||
|
|
||
| bool cancelled = cancelToken.WaitHandle.WaitOne(sleepMilliseconds); | ||
| if (cancelled) | ||
| { | ||
| Release(); | ||
| cancelToken.ThrowIfCancellationRequested(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Exits the semaphore | ||
| /// </summary> | ||
| private void Release() | ||
| { | ||
| lock (_queueLock) | ||
| { | ||
| _releaseTimes.Enqueue(DateTime.UtcNow); | ||
| } | ||
| _pool.Release(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Runs an action after entering the semaphore (if the CancellationToken is not canceled) | ||
| /// </summary> | ||
| public void Run(Action action, CancellationToken cancelToken) | ||
| { | ||
| // will throw if token is cancelled, but will auto-release lock | ||
| Wait(cancelToken); | ||
|
|
||
| try | ||
| { | ||
| action(); | ||
| } | ||
| finally | ||
| { | ||
| Release(); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Runs an action after entering the semaphore (if the CancellationToken is not canceled) | ||
| /// </summary> | ||
| public async Task RunAsync(Func<Task> action, CancellationToken cancelToken) | ||
| { | ||
| // will throw if token is cancelled, but will auto-release lock | ||
| Wait(cancelToken); | ||
|
|
||
| try | ||
| { | ||
| await action().ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| Release(); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Runs an action after entering the semaphore (if the CancellationToken is not canceled) | ||
| /// </summary> | ||
| public async Task RunAsync<T>(Func<T, Task> action, T arg, CancellationToken cancelToken) | ||
| { | ||
| // will throw if token is cancelled, but will auto-release lock | ||
| Wait(cancelToken); | ||
|
|
||
| try | ||
| { | ||
| await action(arg).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| Release(); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Runs an action after entering the semaphore (if the CancellationToken is not canceled) | ||
| /// </summary> | ||
| public async Task<TR> RunAsync<T, TR>(Func<T, CancellationToken, Task<TR>> action, T arg, CancellationToken cancelToken) | ||
| { | ||
| // will throw if token is cancelled, but will auto-release lock | ||
| Wait(cancelToken); | ||
|
|
||
| try | ||
| { | ||
| return await action(arg, cancelToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| Release(); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Releases all resources used by the current instance | ||
| /// </summary> | ||
| public void Dispose() | ||
| { | ||
| _pool.Dispose(); | ||
| } | ||
| } | ||
| } |
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