From 69330ea4665a9af0d2b9264cd5e8da7294501f58 Mon Sep 17 00:00:00 2001 From: Shuai Zhang Date: Wed, 17 Aug 2022 20:43:45 +0800 Subject: [PATCH] Squashed 'RateLimiter/' content from commit 4f88749 git-subtree-dir: RateLimiter git-subtree-split: 4f887490869971de61f9b55a33d8eefa08f541ca --- .editorconfig | 22 + .gitignore | 582 +++++++++++++++ LICENSE.txt | 674 ++++++++++++++++++ README.md | 49 ++ .../FakeStopwatchProviderAndBlocker.cs | 49 ++ RateLimiter.Tests/RateLimiter.Tests.csproj | 20 + RateLimiter.Tests/RateLimiterTest.cs | 76 ++ RateLimiter.sln | 42 ++ RateLimiter/AssemblyInfo.cs | 3 + RateLimiter/IAsyncBlocker.cs | 21 + RateLimiter/IRateLimiter.cs | 67 ++ RateLimiter/RateLimiter.cs | 46 ++ RateLimiter/RateLimiter.csproj | 22 + RateLimiter/RateLimiterBase.cs | 320 +++++++++ RateLimiter/SmoothBurstyRateLimiter.cs | 51 ++ RateLimiter/SmoothRateLimiter.cs | 86 +++ RateLimiter/SmoothWarmingUpRateLimiter.cs | 79 ++ RateLimiter/TimeSpanExtensions.cs | 33 + RateLimiter/TryAcquireResult.cs | 11 + common.props | 11 + version.json | 22 + version.props | 21 + 22 files changed, 2307 insertions(+) create mode 100644 .editorconfig create mode 100644 .gitignore create mode 100644 LICENSE.txt create mode 100644 README.md create mode 100644 RateLimiter.Tests/FakeStopwatchProviderAndBlocker.cs create mode 100644 RateLimiter.Tests/RateLimiter.Tests.csproj create mode 100644 RateLimiter.Tests/RateLimiterTest.cs create mode 100644 RateLimiter.sln create mode 100644 RateLimiter/AssemblyInfo.cs create mode 100644 RateLimiter/IAsyncBlocker.cs create mode 100644 RateLimiter/IRateLimiter.cs create mode 100644 RateLimiter/RateLimiter.cs create mode 100644 RateLimiter/RateLimiter.csproj create mode 100644 RateLimiter/RateLimiterBase.cs create mode 100644 RateLimiter/SmoothBurstyRateLimiter.cs create mode 100644 RateLimiter/SmoothRateLimiter.cs create mode 100644 RateLimiter/SmoothWarmingUpRateLimiter.cs create mode 100644 RateLimiter/TimeSpanExtensions.cs create mode 100644 RateLimiter/TryAcquireResult.cs create mode 100644 common.props create mode 100644 version.json create mode 100644 version.props diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 00000000..ca4f16ec --- /dev/null +++ b/.editorconfig @@ -0,0 +1,22 @@ +root = true + +[**] +charset = utf-8 +end_of_line = crlf +indent_size = 4 +indent_style = space +insert_final_newline = true +trim_trailing_whitespace = true + +[.editorconfig] +end_of_line = lf + +[*.sln] +indent_style = tab +tab_width = 4 + +[**/*.{*proj,xml,props}] +indent_size = 2 + +[**/*.json] +indent_size = 2 diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..3df463e5 --- /dev/null +++ b/.gitignore @@ -0,0 +1,582 @@ + +# Created by https://www.gitignore.io/api/vim,linux,macos,emacs,csharp,windows,visualstudio,visualstudiocode + +### Csharp ### +## Ignore Visual Studio temporary files, build results, and +## files generated by popular Visual Studio add-ons. +## +## Get 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 00000000..407e0a0d --- /dev/null +++ b/README.md @@ -0,0 +1,49 @@ +# RateLimiter # + +This is a C# port of modified version of [Guava RateLimiter](https://github.com/google/guava/blob/master/guava/src/com/google/common/util/concurrent/SmoothRateLimiter.java). + +See the comments in Guava source code for further details. + +## Getting Started ## + +A rate limiter. Conceptually, a rate limiter distributes permits at a configurable rate. +Each `acquire()` blocks if necessary until a permit is available, and then takes it. +Once acquired, permits need not be released. + +RateLimiter is **safe** for concurrent use: It will restrict the total rate of calls from all threads. +Note, however, that it does not guarantee fairness. + +As an example, imagine that we have a list of tasks to execute, but we don't want to submit more than 2 per second: + +```csharp +var rateLimiter = RateLimiter.create(2.0, new SystemStopwatchProvider()); // rate is "2 permits per second" +for (var task : tasks) { + rateLimiter.acquire(); // may wait + submit(task); +} +``` + +As another example, imagine that we produce a stream of data, and we want to cap it at 5kb per second. +This could be accomplished by requiring a permit per byte, and specifying a rate of 5000 permits per second: + +```csharp +IRateLimiter rateLimiter = RateLimiter.create(5000.0); // rate = 5000 permits per second +void submitPacket(byte[] packet) { + rateLimiter.acquire(packet.length); + networkService.send(packet); +} +``` + +It is important to note that the number of permits requested never affects the throttling of +the request itself (an invocation to `acquire(1)` and an invocation to `acquire(1000)` will +result in exactly the same throttling, if any), but it affects the throttling of the next request. +I.e., if an expensive task arrives at an idle RateLimiter, it will be granted immediately, +but it is the next request that will experience extra throttling, thus paying for the cost of the expensive task. + +## Future ## + +Add documents. + +## Acknowledgement ## + +[Guava](https://github.com/google/guava) is licensed in Apache License 2.0 which is compatible with version 3 of the GPL according to [this](https://apache.org/licenses/GPL-compatibility.html). diff --git a/RateLimiter.Tests/FakeStopwatchProviderAndBlocker.cs b/RateLimiter.Tests/FakeStopwatchProviderAndBlocker.cs new file mode 100644 index 00000000..5662543e --- /dev/null +++ b/RateLimiter.Tests/FakeStopwatchProviderAndBlocker.cs @@ -0,0 +1,49 @@ +using System; +using System.Collections.Generic; +using System.Threading; +using System.Threading.Tasks; +using Clocks; + +namespace RateLimiter.Tests +{ + internal class FakeStopwatchProviderAndBlocker : IStopwatchProvider, IAsyncBlocker + { + private long instant = 0; + + internal IList Events { get; } = new List(); + + public long GetTimestamp() + { + return instant; + } + + public TimeSpan ParseDuration(long from, long to) + { + return TimeSpan.FromTicks(to - from); + } + + public long GetNextTimestamp(long from, TimeSpan interval) + { + return from + interval.Ticks; + } + + public Task WaitAsync(TimeSpan timeout, CancellationToken cancellationToken) + { + instant += timeout.Ticks; + Events.Add(timeout.Ticks); + return Task.FromResult(null); + } + + public bool IsHighResolution => throw new NotImplementedException(); + + public IStopwatch Create() + { + throw new NotImplementedException(); + } + + public IStopwatch StartNew() + { + throw new NotImplementedException(); + } + } +} diff --git a/RateLimiter.Tests/RateLimiter.Tests.csproj b/RateLimiter.Tests/RateLimiter.Tests.csproj new file mode 100644 index 00000000..23c77d39 --- /dev/null +++ b/RateLimiter.Tests/RateLimiter.Tests.csproj @@ -0,0 +1,20 @@ + + + + netcoreapp2.0 + + false + + + + + + + + + + + + + + diff --git a/RateLimiter.Tests/RateLimiterTest.cs b/RateLimiter.Tests/RateLimiterTest.cs new file mode 100644 index 00000000..776409eb --- /dev/null +++ b/RateLimiter.Tests/RateLimiterTest.cs @@ -0,0 +1,76 @@ +using System; +using System.Threading; +using Xunit; + +namespace RateLimiter.Tests +{ + public class RateLimiterTest + { + private readonly FakeStopwatchProviderAndBlocker stopwatchProviderAndBlocker = + new FakeStopwatchProviderAndBlocker(); + + internal IRateLimiter Create(double permitsPerSecond) + { + return Create(permitsPerSecond, 1.0); + } + + internal IRateLimiter Create(double permitsPerSecond, double maxBurstSeconds) + { + return new SmoothBurstyRateLimiter(stopwatchProviderAndBlocker, maxBurstSeconds, stopwatchProviderAndBlocker) + { + PermitsPerSecond = permitsPerSecond + }; + } + + internal IRateLimiter Create(double permitsPerSecond, TimeSpan warmupPeriod) + { + return new SmoothWarmingUpRateLimiter(stopwatchProviderAndBlocker, warmupPeriod, 3, stopwatchProviderAndBlocker) + { + PermitsPerSecond = permitsPerSecond + }; + } + + [Fact] + public void TestSimple() + { + var limiter = Create(5, 1); + limiter.Acquire(); // R0.00, since it's the first request + limiter.Acquire(); // R0.20 + limiter.Acquire(); // R0.20 + Assert.Equal(new[] + { + 0L, TimeSpan.FromSeconds(0.2).Ticks, TimeSpan.FromSeconds(0.2).Ticks + }, stopwatchProviderAndBlocker.Events); + } + + [Fact] + public void TestImmediateTryAcquire() + { + var limiter = Create(1); + Assert.True(limiter.TryAcquire().Succeed, "Unable to acquire initial permit"); + Assert.False(limiter.TryAcquire().Succeed, "Capable of acquiring secondary permit"); + } + + [Fact] + public void TestDoubleMinValueCanAcquireExactlyOnce() + { + var r = Create(double.Epsilon); + Assert.True(r.TryAcquire().Succeed, "Unable to acquire initial permit"); + Assert.False(r.TryAcquire().Succeed, "Capable of acquiring an additional permit"); + stopwatchProviderAndBlocker.WaitAsync(TimeSpan.MaxValue.Subtract(TimeSpan.FromTicks(1)), CancellationToken.None).GetAwaiter().GetResult(); + Assert.False(r.TryAcquire().Succeed, "Capable of acquiring an additional permit after sleeping"); + } + + [Fact] + public void TestSimpleRateUpdate() + { + var limiter = Create(5.0, TimeSpan.FromSeconds(5)); + Assert.Equal(5.0, limiter.PermitsPerSecond); + limiter.PermitsPerSecond = 10.0; + Assert.Equal(10.0, limiter.PermitsPerSecond); + + Assert.Throws(() => limiter.PermitsPerSecond = 0); + Assert.Throws(() => limiter.PermitsPerSecond = -10); + } + } +} diff --git a/RateLimiter.sln b/RateLimiter.sln new file mode 100644 index 00000000..7b7ad26a --- /dev/null +++ b/RateLimiter.sln @@ -0,0 +1,42 @@ + +Microsoft Visual Studio Solution File, Format Version 12.00 +# Visual Studio 15 +VisualStudioVersion = 15.0.27130.2010 +MinimumVisualStudioVersion = 10.0.40219.1 +Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{DB6E3832-632F-4510-8007-FF9C72EF18DD}" + ProjectSection(SolutionItems) = preProject + .editorconfig = .editorconfig + .gitignore = .gitignore + common.props = common.props + LICENSE.txt = LICENSE.txt + README.md = README.md + version.json = version.json + version.props = version.props + EndProjectSection +EndProject +Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RateLimiter", "RateLimiter\RateLimiter.csproj", "{C451DA69-95FA-46A9-B4E5-3E41674C22F1}" +EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RateLimiter.Tests", "RateLimiter.Tests\RateLimiter.Tests.csproj", "{2B6D9206-5982-4239-88BA-7986A8ABCA10}" +EndProject +Global + GlobalSection(SolutionConfigurationPlatforms) = preSolution + Debug|Any CPU = Debug|Any CPU + Release|Any CPU = Release|Any CPU + EndGlobalSection + GlobalSection(ProjectConfigurationPlatforms) = postSolution + {C451DA69-95FA-46A9-B4E5-3E41674C22F1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {C451DA69-95FA-46A9-B4E5-3E41674C22F1}.Debug|Any CPU.Build.0 = Debug|Any CPU + {C451DA69-95FA-46A9-B4E5-3E41674C22F1}.Release|Any CPU.ActiveCfg = Release|Any CPU + {C451DA69-95FA-46A9-B4E5-3E41674C22F1}.Release|Any CPU.Build.0 = Release|Any CPU + {2B6D9206-5982-4239-88BA-7986A8ABCA10}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {2B6D9206-5982-4239-88BA-7986A8ABCA10}.Debug|Any CPU.Build.0 = Debug|Any CPU + {2B6D9206-5982-4239-88BA-7986A8ABCA10}.Release|Any CPU.ActiveCfg = Release|Any CPU + {2B6D9206-5982-4239-88BA-7986A8ABCA10}.Release|Any CPU.Build.0 = Release|Any CPU + EndGlobalSection + GlobalSection(SolutionProperties) = preSolution + HideSolutionNode = FALSE + EndGlobalSection + GlobalSection(ExtensibilityGlobals) = postSolution + SolutionGuid = {FB5DA0CD-FCD9-4785-8B0A-6660D79E3CD7} + EndGlobalSection +EndGlobal diff --git a/RateLimiter/AssemblyInfo.cs b/RateLimiter/AssemblyInfo.cs new file mode 100644 index 00000000..05374d3f --- /dev/null +++ b/RateLimiter/AssemblyInfo.cs @@ -0,0 +1,3 @@ +using System.Runtime.CompilerServices; + +[assembly:InternalsVisibleTo("RateLimiter.Tests")] diff --git a/RateLimiter/IAsyncBlocker.cs b/RateLimiter/IAsyncBlocker.cs new file mode 100644 index 00000000..7fc7d3cc --- /dev/null +++ b/RateLimiter/IAsyncBlocker.cs @@ -0,0 +1,21 @@ +using System; +using System.Threading; +using System.Threading.Tasks; + +namespace RateLimiter +{ + internal interface IAsyncBlocker + { + Task WaitAsync(TimeSpan timeout, CancellationToken cancellationToken); + } + + internal class TaskDelayAsyncBlocker : IAsyncBlocker + { + public static readonly IAsyncBlocker Instance = new TaskDelayAsyncBlocker(); + + public Task WaitAsync(TimeSpan timeout, CancellationToken cancellationToken) + { + return Task.Delay(timeout, cancellationToken); + } + } +} diff --git a/RateLimiter/IRateLimiter.cs b/RateLimiter/IRateLimiter.cs new file mode 100644 index 00000000..05c279e3 --- /dev/null +++ b/RateLimiter/IRateLimiter.cs @@ -0,0 +1,67 @@ +using System; +#if !NET20 +using System.Threading; +using System.Threading.Tasks; +#endif + +namespace RateLimiter +{ + public interface IRateLimiter + { + double PermitsPerSecond { get; set; } + + TimeSpan Acquire(); + + TimeSpan Acquire(int permits); + +#if !NET20 + Task AcquireAsync(); + + Task AcquireAsync(CancellationToken cancellationToken); + + Task AcquireAsync(int permits); + + Task AcquireAsync(int permits, CancellationToken cancellationToken); +#endif + + TryAcquireResult TryAcquire(); + +#if !NET20 + Task TryAcquireAsync(); + + Task TryAcquireAsync(CancellationToken cancellationToken); +#endif + + TryAcquireResult TryAcquire(int permits); + +#if !NET20 + Task TryAcquireAsync(int permits); + + Task TryAcquireAsync(int permits, CancellationToken cancellationToken); +#endif + + TryAcquireResult TryAcquire(TimeSpan timeout); + +#if !NET20 + Task TryAcquireAsync(TimeSpan timeout); + + Task TryAcquireAsync(TimeSpan timeout, CancellationToken cancellationToken); +#endif + + TryAcquireResult TryAcquire(int permits, TimeSpan timeout); + +#if !NET20 + Task TryAcquireAsync(int permits, TimeSpan timeout); + + Task TryAcquireAsync(int permits, TimeSpan timeout, CancellationToken cancellationToken); +#endif + + TimeSpan Reserve(int permits); + +#if !NET20 + Task ReserveAsync(int permits); + + Task ReserveAsync(int permits, CancellationToken cancellationToken); +#endif + } +} diff --git a/RateLimiter/RateLimiter.cs b/RateLimiter/RateLimiter.cs new file mode 100644 index 00000000..b8bae8ea --- /dev/null +++ b/RateLimiter/RateLimiter.cs @@ -0,0 +1,46 @@ +using System; +using Clocks; + +namespace RateLimiter +{ + public static class RateLimiter + { + public static IRateLimiter CreateBursty( + double permitsPerSecond, + double maxBurstSeconds, + IStopwatchProvider stopwatchProvider) + { + return new SmoothBurstyRateLimiter(stopwatchProvider, maxBurstSeconds) + { + PermitsPerSecond = permitsPerSecond + }; + } + + public static IRateLimiter CreateWarmingUp( + double permitsPerSecond, + TimeSpan warmupPeriod, + double coldFactor, + IStopwatchProvider stopwatchProvider) + { + return new SmoothWarmingUpRateLimiter(stopwatchProvider, warmupPeriod, coldFactor) + { + PermitsPerSecond = permitsPerSecond + }; + } + + public static IRateLimiter Create( + double permitsPerSecond, + IStopwatchProvider stopwatchProvider) + { + return CreateBursty(permitsPerSecond, 1, stopwatchProvider); + } + + public static IRateLimiter Create( + double permitsPerSecond, + TimeSpan warmupPeriod, + IStopwatchProvider stopwatchProvider) + { + return CreateWarmingUp(permitsPerSecond, warmupPeriod, 3, stopwatchProvider); + } + } +} diff --git a/RateLimiter/RateLimiter.csproj b/RateLimiter/RateLimiter.csproj new file mode 100644 index 00000000..371157c1 --- /dev/null +++ b/RateLimiter/RateLimiter.csproj @@ -0,0 +1,22 @@ + + + + + + net20;net45;netstandard1.3 + + + + RateLimiter2 + + + + + + + + + + + + diff --git a/RateLimiter/RateLimiterBase.cs b/RateLimiter/RateLimiterBase.cs new file mode 100644 index 00000000..3a9eb266 --- /dev/null +++ b/RateLimiter/RateLimiterBase.cs @@ -0,0 +1,320 @@ +using System; +using System.Diagnostics; +using System.Threading; +#if !NET20 +using System.Threading.Tasks; +#endif +using Clocks; + +namespace RateLimiter +{ + public abstract class RateLimiterBase : IRateLimiter + { + protected readonly IStopwatchProvider stopwatchProvider; +#if NET20 + protected readonly object lockObject = new object(); +#else + protected readonly SemaphoreSlim semaphoreSlim = new SemaphoreSlim(1, 1); + internal readonly IAsyncBlocker asyncBlocker; +#endif + + protected RateLimiterBase(IStopwatchProvider stopwatchProvider) +#if !NET20 + : this(stopwatchProvider, null) + { + } + + internal RateLimiterBase( + IStopwatchProvider stopwatchProvider, + IAsyncBlocker asyncBlocker) + { + this.asyncBlocker = asyncBlocker ?? TaskDelayAsyncBlocker.Instance; +#else + { +#endif + this.stopwatchProvider = stopwatchProvider ?? throw new ArgumentNullException(nameof(stopwatchProvider)); + } + + public double PermitsPerSecond + { + get + { +#if NET20 + Monitor.Enter(lockObject); +#else + semaphoreSlim.Wait(); +#endif + try + { + return DoGetRate(); + } + finally + { +#if NET20 + Monitor.Exit(lockObject); +#else + semaphoreSlim.Release(); +#endif + } + } + set + { + if (!(value > 0 && !Double.IsNaN(value))) + throw new ArgumentOutOfRangeException(nameof(PermitsPerSecond)); + +#if NET20 + Monitor.Enter(lockObject); +#else + semaphoreSlim.Wait(); +#endif + try + { + DoSetRate(value, stopwatchProvider.GetTimestamp()); + } + finally + { +#if NET20 + Monitor.Exit(lockObject); +#else + semaphoreSlim.Release(); +#endif + } + } + } + + [DebuggerStepThrough] + public TimeSpan Acquire() + { + return Acquire(1); + } + +#if !NET20 + [DebuggerStepThrough] + public Task AcquireAsync() + { + return AcquireAsync(CancellationToken.None); + } + + [DebuggerStepThrough] + public Task AcquireAsync(CancellationToken cancellationToken) + { + return AcquireAsync(1, cancellationToken); + } +#endif + +#if !NET20 + [DebuggerStepThrough] +#endif + public TimeSpan Acquire(int permits) +#if !NET20 + { + return AcquireAsync(permits).GetAwaiter().GetResult(); + } + + [DebuggerStepThrough] + public Task AcquireAsync(int permits) + { + return AcquireAsync(permits, CancellationToken.None); + } + + public async Task AcquireAsync(int permits, CancellationToken cancellationToken) + { + var waitTimeout = await ReserveAsync(permits, cancellationToken); + await asyncBlocker.WaitAsync(waitTimeout, cancellationToken); + return waitTimeout; + } +#else + { + var waitTimeout = Reserve(permits); + Thread.Sleep(waitTimeout); + return waitTimeout; + } +#endif + + [DebuggerStepThrough] + public TryAcquireResult TryAcquire() + { + return TryAcquire(1, TimeSpan.Zero); + } + +#if !NET20 + [DebuggerStepThrough] + public Task TryAcquireAsync() + { + return TryAcquireAsync(CancellationToken.None); + } + + [DebuggerStepThrough] + public Task TryAcquireAsync(CancellationToken cancellationToken) + { + return TryAcquireAsync(1, TimeSpan.Zero, cancellationToken); + } +#endif + + [DebuggerStepThrough] + public TryAcquireResult TryAcquire(int permits) + { + return TryAcquire(permits, TimeSpan.Zero); + } + +#if !NET20 + [DebuggerStepThrough] + public Task TryAcquireAsync(int permits) + { + return TryAcquireAsync(permits, CancellationToken.None); + } + + [DebuggerStepThrough] + public Task TryAcquireAsync(int permits, CancellationToken cancellationToken) + { + return TryAcquireAsync(permits, TimeSpan.Zero, cancellationToken); + } +#endif + + [DebuggerStepThrough] + public TryAcquireResult TryAcquire(TimeSpan timeout) + { + return TryAcquire(1, timeout); + } + +#if !NET20 + [DebuggerStepThrough] + public Task TryAcquireAsync(TimeSpan timeout) + { + return TryAcquireAsync(timeout, CancellationToken.None); + } + + [DebuggerStepThrough] + public Task TryAcquireAsync(TimeSpan timeout, CancellationToken cancellationToken) + { + return TryAcquireAsync(1, timeout, cancellationToken); + } +#endif + +#if !NET20 + [DebuggerStepThrough] +#endif + public TryAcquireResult TryAcquire(int permits, TimeSpan timeout) +#if !NET20 + { + return TryAcquireAsync(permits, timeout, CancellationToken.None).GetAwaiter().GetResult(); + } + + [DebuggerStepThrough] + public Task TryAcquireAsync(int permits, TimeSpan timeout) + { + return TryAcquireAsync(permits, timeout, CancellationToken.None); + } + + public async Task TryAcquireAsync(int permits, TimeSpan timeout, CancellationToken cancellationToken) +#endif + { + if (!(permits > 0)) throw new ArgumentOutOfRangeException(nameof(permits)); + + TimeSpan waitTimeout; +#if NET20 + Monitor.Enter(lockObject); +#else + await semaphoreSlim.WaitAsync(cancellationToken); +#endif + try + { + var nowTimestamp = stopwatchProvider.GetTimestamp(); + if (!CanAcquire(nowTimestamp, timeout, out var momentAvailableInterval)) + { + return new TryAcquireResult + { + Succeed = false, + MomentAvailableInterval = momentAvailableInterval + }; + } + else + { + waitTimeout = ReserveAndGetWaitLength(permits, nowTimestamp); + } + } + finally + { +#if NET20 + Monitor.Exit(lockObject); +#else + semaphoreSlim.Release(); +#endif + } + +#if NET20 + Thread.Sleep(waitTimeout); +#else + await asyncBlocker.WaitAsync(waitTimeout, cancellationToken); +#endif + return new TryAcquireResult + { + Succeed = true, + MomentAvailableInterval = TimeSpan.Zero + }; + } + +#if !NET20 + [DebuggerStepThrough] +#endif + public TimeSpan Reserve(int permits) +#if !NET20 + { + return ReserveAsync(permits).GetAwaiter().GetResult(); + } + + [DebuggerStepThrough] + public Task ReserveAsync(int permits) + { + return ReserveAsync(permits, CancellationToken.None); + } + + public async Task ReserveAsync(int permits, CancellationToken cancellationToken) +#endif + { + if (!(permits > 0)) throw new ArgumentOutOfRangeException(nameof(permits)); + +#if NET20 + Monitor.Enter(lockObject); +#else + await semaphoreSlim.WaitAsync(cancellationToken); +#endif + try + { + return ReserveAndGetWaitLength(permits, stopwatchProvider.GetTimestamp()); + } + finally + { +#if NET20 + Monitor.Exit(lockObject); +#else + semaphoreSlim.Release(); +#endif + } + } + + protected abstract double DoGetRate(); + + protected abstract void DoSetRate(double permitsPerSecond, long nowTimestamp); + + protected TimeSpan ReserveAndGetWaitLength(int permits, long nowTimestamp) + { + var momentAvailable = stopwatchProvider.ParseDuration( + nowTimestamp, + ReserveEarliestAvailable(permits, nowTimestamp)); + return momentAvailable.Ticks > 0 ? momentAvailable : TimeSpan.Zero; + } + + protected bool CanAcquire(long nowTimestamp, TimeSpan timeout, out TimeSpan momentAvailableInterval) + { + momentAvailableInterval = stopwatchProvider.ParseDuration( + nowTimestamp, + QueryEarliestAvailable(nowTimestamp)); + return momentAvailableInterval <= timeout; + } + + protected abstract long QueryEarliestAvailable(long nowTimestamp); + + protected abstract long ReserveEarliestAvailable(int permits, long nowTimestamp); + } +} diff --git a/RateLimiter/SmoothBurstyRateLimiter.cs b/RateLimiter/SmoothBurstyRateLimiter.cs new file mode 100644 index 00000000..32d76fd7 --- /dev/null +++ b/RateLimiter/SmoothBurstyRateLimiter.cs @@ -0,0 +1,51 @@ +using System; +using Clocks; + +namespace RateLimiter +{ + internal sealed class SmoothBurstyRateLimiter : SmoothRateLimiter + { + public SmoothBurstyRateLimiter( + IStopwatchProvider stopwatchProvider, + double maxBurstSeconds) +#if !NET20 + : this(stopwatchProvider, maxBurstSeconds, null) + { + } + + internal SmoothBurstyRateLimiter( + IStopwatchProvider stopwatchProvider, + double maxBurstSeconds, + IAsyncBlocker asyncBlocker) + : base(stopwatchProvider, asyncBlocker) +#else + : base(stopwatchProvider) +#endif + { + this.maxBurstSeconds = maxBurstSeconds; + } + + private readonly double maxBurstSeconds; + + protected override TimeSpan CoolDownInterval => stableInterval; + + protected override void DoSetRate(double permitsPerSecond, TimeSpan stableInterval) + { + var oldMaxPermits = maxPermits; + maxPermits = maxBurstSeconds * permitsPerSecond; + if (double.IsPositiveInfinity(oldMaxPermits)) + { + storedPermits = maxPermits; + } + else + { + storedPermits = (oldMaxPermits == 0) ? 0 : storedPermits * maxPermits / oldMaxPermits; + } + } + + protected override TimeSpan StoredPermitsToWaitTime(double storedPermits, double permitsToTake) + { + return TimeSpan.Zero; + } + } +} diff --git a/RateLimiter/SmoothRateLimiter.cs b/RateLimiter/SmoothRateLimiter.cs new file mode 100644 index 00000000..c30a6b1c --- /dev/null +++ b/RateLimiter/SmoothRateLimiter.cs @@ -0,0 +1,86 @@ +using System; +using Clocks; + +namespace RateLimiter +{ + public abstract class SmoothRateLimiter : RateLimiterBase + { + protected SmoothRateLimiter(IStopwatchProvider stopwatchProvider) +#if !NET20 + : this(stopwatchProvider, null) + { + } + + internal SmoothRateLimiter(IStopwatchProvider stopwatchProvider, IAsyncBlocker asyncBlocker) + : base(stopwatchProvider, asyncBlocker) +#else + : base(stopwatchProvider) +#endif + { + } + + protected double storedPermits; + + protected double maxPermits; + + protected TimeSpan stableInterval; + + private long nextFreeTicketTimestamp = 0; + + protected abstract TimeSpan CoolDownInterval { get; } + + protected sealed override void DoSetRate(double permitsPerSecond, long nowTimestamp) + { + Resync(nowTimestamp); + var stableIntervalSeconds = 1 / permitsPerSecond; + var stableInterval = stableIntervalSeconds < TimeSpan.MaxValue.TotalSeconds + ? TimeSpan.FromSeconds(1 / permitsPerSecond) + : TimeSpan.MaxValue; + this.stableInterval = stableInterval; + DoSetRate(permitsPerSecond, stableInterval); + } + + protected sealed override double DoGetRate() + { + return 1 / stableInterval.TotalSeconds; + } + + protected sealed override long QueryEarliestAvailable(long nowTimestamp) + { + return nextFreeTicketTimestamp; + } + + protected sealed override long ReserveEarliestAvailable(int requiredPermits, long nowTimestamp) + { + Resync(nowTimestamp); + var returnValue = nextFreeTicketTimestamp; + var storedPermitsToSpend = Math.Min(requiredPermits, storedPermits); + var freshPermits = requiredPermits - storedPermitsToSpend; + var waitTimeout = StoredPermitsToWaitTime(storedPermits, storedPermitsToSpend) + + FreshPermitsToWaitTime(freshPermits); + nextFreeTicketTimestamp = stopwatchProvider.GetNextTimestamp(nextFreeTicketTimestamp, waitTimeout); + storedPermits -= storedPermitsToSpend; + return returnValue; + } + + protected abstract TimeSpan StoredPermitsToWaitTime(double storedPermits, double permitsToTake); + + private TimeSpan FreshPermitsToWaitTime(double permits) + { + return stableInterval.Multiply(permits); + } + + protected void Resync(long nowTimestamp) + { + if (nowTimestamp > nextFreeTicketTimestamp) + { + var newDuration = stopwatchProvider.ParseDuration(nextFreeTicketTimestamp, nowTimestamp); + double newPermits = newDuration.Ticks / (double)CoolDownInterval.Ticks; + storedPermits = Math.Min(maxPermits, storedPermits + newPermits); + nextFreeTicketTimestamp = nowTimestamp; + } + } + + protected abstract void DoSetRate(double permitsPerSecond, TimeSpan stableInterval); + } +} diff --git a/RateLimiter/SmoothWarmingUpRateLimiter.cs b/RateLimiter/SmoothWarmingUpRateLimiter.cs new file mode 100644 index 00000000..ac81fe23 --- /dev/null +++ b/RateLimiter/SmoothWarmingUpRateLimiter.cs @@ -0,0 +1,79 @@ +using System; +using Clocks; + +namespace RateLimiter +{ + internal sealed class SmoothWarmingUpRateLimiter : SmoothRateLimiter + { + public SmoothWarmingUpRateLimiter( + IStopwatchProvider stopwatchProvider, + TimeSpan warmupPeriod, + double coldFactor) +#if !NET20 + : this(stopwatchProvider, warmupPeriod, coldFactor, null) + { + } + + internal SmoothWarmingUpRateLimiter( + IStopwatchProvider stopwatchProvider, + TimeSpan warmupPeriod, + double coldFactor, + IAsyncBlocker asyncBlocker) + : base(stopwatchProvider, asyncBlocker) +#else + : base(stopwatchProvider) +#endif + { + this.warmupPeriod = warmupPeriod; + this.coldFactor = coldFactor; + } + + private readonly TimeSpan warmupPeriod; + + private readonly double coldFactor; + + private double thresholdPermits; + + private TimeSpan slope; + + protected override TimeSpan CoolDownInterval => warmupPeriod.Divide(maxPermits); + + protected override void DoSetRate(double permitsPerSecond, TimeSpan stableInterval) + { + var oldMaxPermits = maxPermits; + var coldInterval = stableInterval.Multiply(coldFactor); + thresholdPermits = 0.5 * warmupPeriod.Ticks / stableInterval.Ticks; + maxPermits = thresholdPermits + 2.0 * warmupPeriod.Ticks / (stableInterval + coldInterval).Ticks; + slope = (coldInterval - stableInterval).Divide(maxPermits - thresholdPermits); + if (oldMaxPermits == double.PositiveInfinity) + { + storedPermits = 0; + } + else + { + storedPermits = (oldMaxPermits == 0) ? maxPermits : (storedPermits * maxPermits / oldMaxPermits); + } + } + + protected override TimeSpan StoredPermitsToWaitTime(double storedPermits, double permitsToTake) + { + var availablePermitsAboveThreshold = storedPermits - thresholdPermits; + var returnValue = TimeSpan.Zero; + if (availablePermitsAboveThreshold > 0) + { + var permitsAboveThresholdToTake = Math.Min(availablePermitsAboveThreshold, permitsToTake); + var length = PermitsToTime(availablePermitsAboveThreshold) + + PermitsToTime(availablePermitsAboveThreshold - permitsAboveThresholdToTake); + returnValue = length.Multiply(permitsAboveThresholdToTake / 2.0); + permitsToTake -= permitsAboveThresholdToTake; + } + returnValue += stableInterval.Multiply(permitsToTake); + return returnValue; + } + + private TimeSpan PermitsToTime(double permits) + { + return stableInterval + slope.Multiply(permits); + } + } +} diff --git a/RateLimiter/TimeSpanExtensions.cs b/RateLimiter/TimeSpanExtensions.cs new file mode 100644 index 00000000..6d08b3d1 --- /dev/null +++ b/RateLimiter/TimeSpanExtensions.cs @@ -0,0 +1,33 @@ +using System; + +namespace RateLimiter +{ + internal static class TimeSpanExtensions + { + public static TimeSpan Multiply(this TimeSpan timeSpan, double times) + { + var resultMillis = timeSpan.TotalMilliseconds * times; + if (resultMillis < TimeSpan.MaxValue.TotalMilliseconds) + { + return TimeSpan.FromMilliseconds(resultMillis); + } + else + { + return TimeSpan.MaxValue; + } + } + + public static TimeSpan Divide(this TimeSpan timeSpan, double divider) + { + var resultMillis = timeSpan.TotalMilliseconds / divider; + if (resultMillis > TimeSpan.MinValue.TotalMilliseconds) + { + return TimeSpan.FromMilliseconds(resultMillis); + } + else + { + return TimeSpan.MinValue; + } + } + } +} diff --git a/RateLimiter/TryAcquireResult.cs b/RateLimiter/TryAcquireResult.cs new file mode 100644 index 00000000..e98b0ee1 --- /dev/null +++ b/RateLimiter/TryAcquireResult.cs @@ -0,0 +1,11 @@ +using System; + +namespace RateLimiter +{ + public class TryAcquireResult + { + public bool Succeed { get; set; } + + public TimeSpan MomentAvailableInterval { get; set; } + } +} diff --git a/common.props b/common.props new file mode 100644 index 00000000..5a2c52de --- /dev/null +++ b/common.props @@ -0,0 +1,11 @@ + + + + + false + true + + + + + diff --git a/version.json b/version.json new file mode 100644 index 00000000..05cffbe9 --- /dev/null +++ b/version.json @@ -0,0 +1,22 @@ +{ + "version": "1.2.0", + "semVer1NumericIdentifierPadding": 4, + "nugetPackageVersion": { + "semVer": 1 + }, + "publicReleaseRefSpec": [ + "^refs/heads/master$", + "^refs/tags/v\\d+\\.\\d+\\.\\d+" + ], + "cloudBuild": { + "setVersionVariables": true, + "buildNumber": { + "enabled": false, + "includeCommitId": { + "when": "nonPublicReleaseOnly", + "where": "buildMetadata" + } + } + }, + "inherit": false +} diff --git a/version.props b/version.props new file mode 100644 index 00000000..ca31c95e --- /dev/null +++ b/version.props @@ -0,0 +1,21 @@ + + + + + Shuai Zhang + Shuai Zhang + Copyright 2017 Shuai Zhang under GPLv3 + This is a C# port of modified version of Guava RateLimiter. See project site for further details. + https://www.gnu.org/licenses/gpl-3.0-standalone.html + https://github.com/hcoona/RateLimiter + https://github.com/hcoona/RateLimiter + Git + rate-limit guava + $(Description) + + + + + + +