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EonaCat
2025-12-15 19:56:17 +01:00
parent c04107c9b8
commit d93d29522c
26 changed files with 1152 additions and 43 deletions
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49
EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
<LangVersion>latest</LangVersion>
<PackageId>EonaCat.DeterministicTime.AspNetCore</PackageId>
<Version>1.0.0</Version>
<Authors>EonaCat (Jeroen Saey)</Authors>
<Description>
ASP.NET Core integration for DeterministicTime.
</Description>
<PackageTags>aspnet;core;middleware;time;deterministic;</PackageTags>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>EonaCat.DeterministicTime.AspNetCore</Title>
<Company>EonaCat (Jeroen Saey)</Company>
<Product>EonaCat.DeterministicTime.AspNetCore</Product>
<Copyright>EonaCat (Jeroen Saey)</Copyright>
<PackageProjectUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</PackageProjectUrl>
<PackageIcon>icon.png</PackageIcon>
<PackageReadmeFile>Readme.md</PackageReadmeFile>
<RepositoryUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</RepositoryUrl>
<RepositoryType>git</RepositoryType>
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<None Include="..\..\icon.png">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\LICENSE">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\Readme.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
</ItemGroup>
<ItemGroup>
<PackageReference Include="EonaCat.DeterministicTime" Version="1.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.3.0" />
</ItemGroup>
</Project>

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EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore/Middleware/DeterministicTimeMiddleware.cs Normal file
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using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using System.Net.Http;
namespace EonaCat.DeterministicTime.AspNetCore;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public sealed class DeterministicTimeMiddleware
{
private readonly RequestDelegate _next;
public DeterministicTimeMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task InvokeAsync(HttpContext context)
{
using (TimeScope.Scaled(1.0))
{
await _next(context);
}
}
}
public static class DeterministicTimeMiddlewareExtensions
{
public static IApplicationBuilder UseDeterministicTime(
this IApplicationBuilder app)
{
return app.UseMiddleware<DeterministicTimeMiddleware>();
}
}

12
EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore/Properties/launchSettings.json Normal file
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{
"profiles": {
"EonaCat.DeterministicTime.AspNet": {
"commandName": "Project",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "https://localhost:56865;http://localhost:56866"
}
}
}

51
EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net48</TargetFramework>
<Nullable>enable</Nullable>
<LangVersion>latest</LangVersion>
<PackageId>EonaCat.DeterministicTime.AspNetFramework</PackageId>
<Version>1.0.0</Version>
<Authors>EonaCat (Jeroen Saey)</Authors>
<Description>
ASP.NET 4.8 integration for DeterministicTime.
</Description>
<PackageTags>aspnet;httpmodule;time;deterministic</PackageTags>
<LangVersion>latest</LangVersion>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>EonaCat.DeterministicTime.AspNetFramework</Title>
<Company>EonaCat (Jeroen Saey)</Company>
<Copyright>EonaCat (Jeroen Saey)</Copyright>
<PackageProjectUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</PackageProjectUrl>
<PackageIcon>icon.png</PackageIcon>
<PackageReadmeFile>Readme.md</PackageReadmeFile>
<RepositoryUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</RepositoryUrl>
<RepositoryType>git</RepositoryType>
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<None Include="..\..\icon.png">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\LICENSE">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\Readme.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
</ItemGroup>
<ItemGroup>
<PackageReference Include="EonaCat.DeterministicTime" Version="1.0.0" />
</ItemGroup>
<ItemGroup>
<Reference Include="System.Web" />
</ItemGroup>
</Project>

19
EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework/Modules/DeterministicTimeMiddleware.cs Normal file
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using System.Web;
namespace EonaCat.DeterministicTime.AspNetFramework;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public class DeterministicTimeHttpModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.BeginRequest += (sender, e) =>
{
TimeScope.Scaled(1.0); // per-request deterministic scope
};
}
public void Dispose() { }
}

12
EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework/Properties/launchSettings.json Normal file
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{
"profiles": {
"EonaCat.DeterministicTime.AspNet": {
"commandName": "Project",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "https://localhost:56865;http://localhost:56866"
}
}
}

5
EonaCat.DeterministicTime/EonaCat.DeterministicTime.slnx Normal file
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<Solution>
<Project Path="../EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore/EonaCat.DeterministicTime.AspNetCore.csproj" />
<Project Path="../EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework/EonaCat.DeterministicTime.AspNetFramework.csproj" />
<Project Path="EonaCat.DeterministicTime/EonaCat.DeterministicTime.csproj" />
</Solution>

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EonaCat.DeterministicTime/EonaCat.DeterministicTime/DeterministicDelay.cs Normal file
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using System;
using System.Threading.Tasks;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
/// <summary>
/// Deterministic replacement for Task.Delay.
/// Completes when deterministic time advances past the delay.
/// </summary>
public static class DeterministicDelay
{
public static Task For(TimeSpan delay)
{
if (delay < TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(delay));
}
var tcs = new TaskCompletionSource<bool>(
TaskCreationOptions.RunContinuationsAsynchronously);
DeterministicTimer.Start(delay, () =>
{
tcs.TrySetResult(true);
});
return tcs.Task;
}
}

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EonaCat.DeterministicTime/EonaCat.DeterministicTime/DeterministicScheduler.cs Normal file
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using System;
using System.Collections.Generic;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public sealed class DeterministicScheduler
{
private readonly object _lock = new();
private readonly List<ScheduledJob> _jobs = new();
public static DeterministicScheduler Global { get; } = new();
public void Tick()
{
var now = DeterministicTime.UtcNow;
lock (_lock)
{
foreach (var job in _jobs)
{
job.TryRun(now);
}
}
}
public IDisposable Every(TimeSpan interval, Action action)
{
var job = new ScheduledJob(interval, action);
lock (_lock)
{
_jobs.Add(job);
}
return new Handle(() => _jobs.Remove(job));
}
private sealed class Handle : IDisposable
{
private readonly Action _dispose;
public Handle(Action dispose) => _dispose = dispose;
public void Dispose() => _dispose();
}
private sealed class ScheduledJob
{
private readonly TimeSpan _interval;
private readonly Action _action;
private DateTime _next;
public ScheduledJob(TimeSpan interval, Action action)
{
_interval = interval;
_action = action;
_next = DeterministicTime.UtcNow + interval;
}
public void TryRun(DateTime now)
{
while (now >= _next)
{
_action();
_next += _interval;
}
}
}
}

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EonaCat.DeterministicTime/EonaCat.DeterministicTime/DeterministicStopwatch.cs Normal file
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using System;
using System.Diagnostics;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public sealed class DeterministicStopwatch
{
private long _start;
private long _elapsed;
private bool _running;
public static DeterministicStopwatch StartNew()
{
var sw = new DeterministicStopwatch();
sw.Start();
return sw;
}
public void Start()
{
if (_running)
{
return;
}
_start = DeterministicTime.GetTimestamp();
_running = true;
}
public void Stop()
{
if (!_running)
{
return;
}
_elapsed += DeterministicTime.GetTimestamp() - _start;
_running = false;
}
public void Reset()
{
_elapsed = 0;
_running = false;
}
public TimeSpan Elapsed
{
get
{
long ticks = _elapsed;
if (_running)
{
ticks += DeterministicTime.GetTimestamp() - _start;
}
// Convert Stopwatch ticks to TimeSpan
double seconds = (double)ticks / Stopwatch.Frequency;
return TimeSpan.FromSeconds(seconds);
}
}
}

50
EonaCat.DeterministicTime/EonaCat.DeterministicTime/DeterministicTime.cs Normal file
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using System;
using System.Threading;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public static class DeterministicTime
{
private static readonly AsyncLocal<ITimeSource?> _current = new();
private static readonly ITimeSource _system = new SystemTimeSource();
private static ITimeSource Source => _current.Value ?? _system;
public static DateTime UtcNow => Source.UtcNow;
public static DateTime Now => Source.UtcNow.ToLocalTime();
public static long GetTimestamp() => Source.Timestamp;
internal static IDisposable Push(ITimeSource source)
{
var previous = _current.Value;
_current.Value = source;
return new Scope(() => _current.Value = previous);
}
public static void Advance(TimeSpan delta)
{
if (Source is not IAdjustableTimeSource adjustable)
{
throw new InvalidOperationException("Time source is not adjustable");
}
adjustable.Advance(delta);
DeterministicScheduler.Global.Tick();
}
public static IDisposable WithOffset(TimeSpan offset)
{
return Push(new OffsetTimeSource(Source, offset));
}
private sealed class Scope : IDisposable
{
private readonly Action _restore;
public Scope(Action restore) => _restore = restore;
public void Dispose() => _restore();
}
}

59
EonaCat.DeterministicTime/EonaCat.DeterministicTime/DeterministicTimer.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
/// <summary>
/// A deterministic, virtual-time-aware timer.
/// Fires immediately when deterministic time passes its due time.
/// </summary>
public sealed class DeterministicTimer : IDisposable
{
private readonly Action _callback;
private readonly IDisposable _handle;
private bool _fired;
private DeterministicTimer(TimeSpan delay, Action callback)
{
_callback = callback;
_handle = DeterministicScheduler.Global.Every(
delay,
TryFire
);
}
private void TryFire()
{
if (_fired)
{
return;
}
_fired = true;
_callback();
Dispose();
}
/// <summary>
/// Starts a one-shot deterministic timer.
/// </summary>
public static DeterministicTimer Start(
TimeSpan delay,
Action callback)
{
if (delay < TimeSpan.Zero)
{
throw new ArgumentOutOfRangeException(nameof(delay));
}
return new DeterministicTimer(delay, callback);
}
public void Dispose()
{
_handle.Dispose();
}
}

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EonaCat.DeterministicTime/EonaCat.DeterministicTime/DistributedTimeSource.cs Normal file
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using System;
using System.Diagnostics;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public interface IDistributedTimeCoordinator
{
DateTime GetClusterUtc();
}
public sealed class DistributedTimeSource : ITimeSource
{
private readonly IDistributedTimeCoordinator _coordinator;
public DistributedTimeSource(IDistributedTimeCoordinator coordinator)
{
_coordinator = coordinator;
}
public DateTime UtcNow => _coordinator.GetClusterUtc();
public long Timestamp => Stopwatch.GetTimestamp();
}

40
EonaCat.DeterministicTime/EonaCat.DeterministicTime/EonaCat.DeterministicTime.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFrameworks>netstandard2.1; net48</TargetFrameworks>
<PackageId>EonaCat.DeterministicTime</PackageId>
<Version>1.0.0</Version>
<Authors>EonaCat (Jeroen Saey)</Authors>
<Description>Deterministic, testable, and replayable time for .NET</Description>
<RepositoryUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</RepositoryUrl>
<PackageTags>time;testing;ntp;deterministic;clock;EonaCat;Jeroen;Saey</PackageTags>
<GenerateDocumentationFile>true</GenerateDocumentationFile>
<LangVersion>latest</LangVersion>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>EonaCat.DeterministicTime</Title>
<Company>EonaCat (Jeroen Saey)</Company>
<Product>EonaCat.DeterministicTime</Product>
<Copyright>EonaCat (Jeroen Saey)</Copyright>
<PackageProjectUrl>https://git.saey.me/EonaCat/EonaCat.DeterministicTime</PackageProjectUrl>
<PackageIcon>icon.png</PackageIcon>
<PackageReadmeFile>Readme.md</PackageReadmeFile>
<RepositoryType>git</RepositoryType>
<PackageLicenseFile>LICENSE</PackageLicenseFile>
</PropertyGroup>
<ItemGroup>
<None Include="..\..\icon.png">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\LICENSE">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Include="..\..\Readme.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
</ItemGroup>
<ItemGroup>
<PackageReference Include="EonaCat.Json" Version="1.2.0" />
</ItemGroup>
</Project>

11
EonaCat.DeterministicTime/EonaCat.DeterministicTime/IAdjustableTimeSource.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public interface IAdjustableTimeSource : ITimeSource
{
void Advance(TimeSpan delta);
}

12
EonaCat.DeterministicTime/EonaCat.DeterministicTime/ITimeSoure.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public interface ITimeSource
{
DateTime UtcNow { get; }
long Timestamp { get; }
}

20
EonaCat.DeterministicTime/EonaCat.DeterministicTime/NtpSynchronization.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public interface INtpTimeProvider
{
DateTime GetNetworkUtc();
}
public static class NtpSynchronization
{
public static IDisposable Sync(INtpTimeProvider provider)
{
var offset = provider.GetNetworkUtc() - DateTime.UtcNow;
return DeterministicTime.WithOffset(offset);
}
}

21
EonaCat.DeterministicTime/EonaCat.DeterministicTime/OffsetTimeSource.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
internal sealed class OffsetTimeSource : ITimeSource
{
private readonly ITimeSource _inner;
private readonly TimeSpan _offset;
public OffsetTimeSource(ITimeSource inner, TimeSpan offset)
{
_inner = inner;
_offset = offset;
}
public DateTime UtcNow => _inner.UtcNow + _offset;
public long Timestamp => _inner.Timestamp;
}

13
EonaCat.DeterministicTime/EonaCat.DeterministicTime/SystemTimeSource.cs Normal file
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using System;
using System.Diagnostics;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
internal sealed class SystemTimeSource : ITimeSource
{
public DateTime UtcNow => DateTime.UtcNow;
public long Timestamp => Stopwatch.GetTimestamp();
}

42
EonaCat.DeterministicTime/EonaCat.DeterministicTime/TimeRecording.cs Normal file
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using EonaCat.Json;
using System;
using System.Collections.Generic;
using System.IO;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public sealed class TimeRecording : ITimeSource, IDisposable
{
private readonly ITimeSource _inner;
private readonly List<DateTime> _log = new();
private readonly IDisposable _scope;
private TimeRecording(ITimeSource inner)
{
_inner = inner;
_scope = DeterministicTime.Push(this);
}
public static TimeRecording Start() =>
new(new SystemTimeSource());
public DateTime UtcNow
{
get
{
var value = _inner.UtcNow;
_log.Add(value);
return value;
}
}
public long Timestamp => _inner.Timestamp;
public void Save(string path) =>
File.WriteAllText(path, JsonHelper.ToJson(_log));
public void Dispose() => _scope.Dispose();
}

38
EonaCat.DeterministicTime/EonaCat.DeterministicTime/TimeReplay.cs Normal file
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using EonaCat.Json;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public sealed class TimeReplay : ITimeSource, IDisposable
{
private readonly Queue<DateTime> _queue;
private readonly IDisposable _scope;
private TimeReplay(IEnumerable<DateTime> times)
{
_queue = new Queue<DateTime>(times);
_scope = DeterministicTime.Push(this);
}
public static IDisposable Load(string path)
{
var times = JsonHelper.ToObject<List<DateTime>>(
File.ReadAllText(path))!;
return new TimeReplay(times);
}
public DateTime UtcNow =>
_queue.Count > 0
? _queue.Dequeue()
: throw new InvalidOperationException("Replay exhausted");
public long Timestamp => Stopwatch.GetTimestamp();
public void Dispose() => _scope.Dispose();
}

26
EonaCat.DeterministicTime/EonaCat.DeterministicTime/TimeScope.cs Normal file
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using System;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
public static class TimeScope
{
public static IDisposable Frozen(DateTime utc) =>
DeterministicTime.Push(new VirtualTimeSource(utc, 0));
public static IDisposable Scaled(double scale)
{
if (scale < 0)
{
throw new ArgumentOutOfRangeException(nameof(scale));
}
return DeterministicTime.Push(
new VirtualTimeSource(DeterministicTime.UtcNow, scale));
}
public static IDisposable Offset(TimeSpan offset) =>
DeterministicTime.WithOffset(offset);
}

55
EonaCat.DeterministicTime/EonaCat.DeterministicTime/VirtualTimeSource.cs Normal file
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using System;
using System.Diagnostics;
namespace EonaCat.DeterministicTime;
// This file is part of the EonaCat project(s) which is released under the Apache License.
// See the LICENSE file or go to https://EonaCat.com/License for full license details.
internal sealed class VirtualTimeSource : IAdjustableTimeSource
{
private DateTime _baseTime;
private long _baseTimestamp;
private readonly double _scale;
public VirtualTimeSource(DateTime startUtc, double scale)
{
_baseTime = DateTime.SpecifyKind(startUtc, DateTimeKind.Utc);
_baseTimestamp = Stopwatch.GetTimestamp();
_scale = scale;
}
public DateTime UtcNow
{
get
{
long nowTicks = Stopwatch.GetTimestamp();
long deltaTicks = nowTicks - _baseTimestamp;
// Convert delta ticks to TimeSpan
double deltaSeconds = (double)deltaTicks / Stopwatch.Frequency;
var elapsed = TimeSpan.FromSeconds(deltaSeconds);
// Apply scale
long scaledTicks = (long)(elapsed.Ticks * _scale);
return _baseTime.AddTicks(scaledTicks);
}
}
public long Timestamp
{
get
{
var delta = Stopwatch.GetTimestamp() - _baseTimestamp;
return _baseTimestamp + (long)(delta * _scale);
}
}
public void Advance(TimeSpan delta)
{
_baseTime = _baseTime.Add(delta);
_baseTimestamp = Stopwatch.GetTimestamp();
}
}

213
LICENSE
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
https://EonaCat.com/license/
1. Definitions. TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
OF SOFTWARE BY EONACAT (JEROEN SAEY)
"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. 1. Definitions.
"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files. "You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types. "Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
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# EonaCat.DeterministicTime # EonaCat.DeterministicTime
EonaCat.DeterministicTime is a **.NET library for deterministic, testable, and replayable time**.
It replaces `DateTime.UtcNow`, `Stopwatch`, `Timer`, and `Task.Delay` with deterministic equivalents and supports advanced features like:
scheduling,
time scaling,
replay,
NTP offsets,
ASP.NET Framework integration.
ASP.NET Core integration.
---
## Installation
```
dotnet add package EonaCat.DeterministicTime
```
### ASP.NET Core integration (optional)
```
dotnet add package DeterministicTime.AspNetCore
```
### ASP.NET Framework integration (optional)
```
dotnet add package DeterministicTime.AspNetFramework
```
ASP.NET 4.8 → add DeterministicTime.AspNetFramework and register HttpModule in web.config:
```xml
<system.web>
<httpModules>
<add name="DeterministicTime" type="DeterministicTimeHttpModule"/>
</httpModules>
</system.web>
```
---
## Basic Usage
```csharp
using DeterministicTime;
DateTime now = DeterministicTime.UtcNow;
DateTime localNow = DeterministicTime.Now;
```
---
## Freeze Time
```csharp
using (TimeScope.Frozen(DateTime.Parse("2025-01-01T00:00:00Z")))
{
Console.WriteLine(DeterministicTime.UtcNow); // frozen
}
```
---
## Scale Time
```csharp
using (TimeScope.Scaled(10)) // 10x faster
{
// all timers and delays scale 10x
}
```
---
## Advance Time Manually
```csharp
DeterministicTime.Advance(TimeSpan.FromHours(2));
```
---
## Offset Time
```csharp
using (TimeScope.Offset(TimeSpan.FromMinutes(5)))
{
// all UtcNow calls are offset by 5 minutes
}
```
---
## Deterministic Stopwatch
```csharp
var sw = DeterministicStopwatch.StartNew();
// do work
sw.Stop();
Console.WriteLine(sw.Elapsed);
```
---
## Deterministic Timer
```csharp
int fired = 0;
DeterministicTimer.Start(TimeSpan.FromSeconds(10), () => fired++);
DeterministicTime.Advance(TimeSpan.FromSeconds(10));
Console.WriteLine(fired); // 1
```
---
## Deterministic Delay
```csharp
bool completed = false;
await DeterministicDelay.For(TimeSpan.FromSeconds(5)).ContinueWith(_ => completed = true);
DeterministicTime.Advance(TimeSpan.FromSeconds(5));
Console.WriteLine(completed); // true
```
---
## Deterministic Scheduler
```csharp
var scheduler = DeterministicScheduler.Global;
scheduler.Every(TimeSpan.FromMinutes(1), () => Console.WriteLine("Tick"));
DeterministicTime.Advance(TimeSpan.FromMinutes(5)); // fires 5 times
```
---
## Time Recording & Replay
### Record
```csharp
using var recording = TimeRecording.Start();
// run code
recording.Save("run.json");
```
### Replay
```csharp
using (TimeReplay.Load("run.json"))
{
// deterministic replay of UtcNow calls
}
```
---
## NTP Synchronization
```csharp
using (NtpSynchronization.Sync(myNtpProvider))
{
// deterministic time aligned with NTP
}
```
---
## Distributed Time Source
```csharp
IDistributedTimeCoordinator coordinator = ...;
DeterministicTime.Push(new DistributedTimeSource(coordinator));
Console.WriteLine(DeterministicTime.UtcNow);
```
---
## ASP.NET Core Middleware
```csharp
app.UseDeterministicTime();
```
* Each request runs in its own deterministic scope
* Works with frozen/scaled time and timers
---
## Advanced Features Summary
* **Deterministic UtcNow & Now**
* **Stopwatch replacement**
* **One-shot and repeated timers**
* **Task.Delay replacement**
* **Time scaling, freezing, offset**
* **Scheduler for background jobs**
* **Recording & replay for testing**
* **NTP synchronization & distributed clocks**
* **ASP.NET Framework integration**
* **ASP.NET Core integration**
EonaCat.DeterministicTime

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