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creates simple healthchecks

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MANUEL JUAN MORALES AMAT
2025-08-25 23:46:04 +02:00
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namespace MCVIngenieros.Healthchecks.Abstracts;
public abstract class HealthCheck : IHealthCheck
{
public virtual int? RetryAttempts => 2;
public virtual TimeSpan? Timeout => TimeSpan.FromSeconds(3);
public virtual TimeSpan? RetryDelay => TimeSpan.FromSeconds(1);
public virtual HealthCheckSeverity? Severity => HealthCheckSeverity.Critical;
public virtual string? Description => null;
public abstract Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default);
}

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namespace MCVIngenieros.Healthchecks.Abstracts;
// Severity levels for health checks
public enum HealthCheckSeverity { Info, Warning, Critical }

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using System.ComponentModel;
namespace MCVIngenieros.Healthchecks.Abstracts;
// Health check interface
[EditorBrowsable(EditorBrowsableState.Never)]
public interface IHealthCheck
{
int? RetryAttempts { get; }
TimeSpan? Timeout { get; }
TimeSpan? RetryDelay { get; }
HealthCheckSeverity? Severity { get; }
string? Description { get; }
Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default);
}

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using System.ComponentModel;
namespace MCVIngenieros.Healthchecks.Abstracts;
// Health check container interface
[EditorBrowsable(EditorBrowsableState.Never)]
public interface IHealthCheckContainer
{
Task<List<HealthCheckResult>> RunAllChecks(CancellationToken cancellationToken = default);
Task<HealthCheckResult?> RunCheck(string name, CancellationToken cancellationToken = default);
Task<List<HealthCheckResult>> RunChecks(IEnumerable<string> names, CancellationToken cancellationToken = default);
IReadOnlyList<string> GetAllCheckNames();
void DiscoverHealthChecks();
IReadOnlyDictionary<string, IHealthCheck> GetAllChecks();
Task<List<HealthCheckResult>> GetAllChecksResults(CancellationToken cancellationToken = default);
}

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using MCVIngenieros.Healthchecks.Options;
namespace MCVIngenieros.Healthchecks.Abstracts;
public interface IHealthCheckWithOptions : IHealthCheck
{
HealthChecksConfigs Options { get; }
}

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but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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:
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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
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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
<https://www.gnu.org/licenses/>.
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
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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HealthCheckResult.cs Normal file
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using MCVIngenieros.Healthchecks.Abstracts;
namespace MCVIngenieros.Healthchecks;
// Health check result model
public record HealthCheckResult
{
public static HealthCheckResult Healthy(
string? msg = null,
HealthCheckSeverity severity = HealthCheckSeverity.Warning,
Exception? exception = null,
Dictionary<string, object>? data = null
)
{
return new HealthCheckResult(true)
{
Details = msg ?? "Healthy",
Severity = severity,
Exception = exception,
Data = data,
};
}
public static HealthCheckResult Unhealthy(
string? msg = null,
HealthCheckSeverity severity = HealthCheckSeverity.Warning,
Exception? exception = null,
Dictionary<string, object>? data = null
)
{
return new HealthCheckResult(false)
{
Details = msg ?? "Unhealthy",
Severity = severity,
Exception = exception,
Data = data,
};
}
public HealthCheckResult() { }
public HealthCheckResult(bool IsHealthy)
{
this.IsHealthy = IsHealthy;
}
public HealthCheckResult(bool IsHealthy, HealthCheckSeverity severity) : this(IsHealthy)
{
this.Severity = severity;
}
public HealthCheckResult(bool IsHealthy, string name, string details = "", HealthCheckSeverity severity = HealthCheckSeverity.Info, Exception? exception = null, Dictionary<string, object>? data = null) : this(IsHealthy, severity)
{
this.Name = name;
this.Details = details;
this.Exception = exception;
this.Data = data;
}
public string Name { get; set; } = string.Empty;
public string Details { get; set; } = string.Empty;
public bool IsHealthy { get; set; }
public HealthCheckSeverity Severity { get; set; } = HealthCheckSeverity.Info;
public Exception? Exception { get; set; }
public Dictionary<string, object>? Data { get; set; }
}

85
HealthCheckServiceCollectionExtensions.cs Normal file
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using MCVIngenieros.Healthchecks.__;
using MCVIngenieros.Healthchecks.__.__Controllers;
using MCVIngenieros.Healthchecks.Abstracts;
using MCVIngenieros.Healthchecks.Options;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
using System.Reflection;
namespace MCVIngenieros.Healthchecks;
// Extension methods for IServiceCollection
public static class HealthCheckServiceCollectionExtensions
{
private static IServiceCollection AddHealthChecksSupport(this IServiceCollection services, HealthCheckContainerOptions options)
{
ArgumentNullException.ThrowIfNull(services, nameof(services));
services.AddSingleton<IHealthCheckContainer, HealthCheckContainer>();
services.AddSingleton(Microsoft.Extensions.Options.Options.Create(options));
services.AddCheck<ImAliveHealthcheck>();
services.AddControllers().AddApplicationPart(typeof(HealthCheckController).Assembly);
return services;
}
public static IServiceCollection AddHealthChecksSupport(this IServiceCollection services)
{
ArgumentNullException.ThrowIfNull(services, nameof(services));
var options = new HealthCheckContainerOptions();
var scope = services.BuildServiceProvider().CreateScope();
var config = scope.ServiceProvider.GetRequiredService<IConfiguration>();
scope.Dispose();
services.Configure<HealthCheckOptions>(nameof(HealthCheckOptions), config.GetSection(nameof(HealthChecksConfigs)));
scope = services.BuildServiceProvider().CreateScope();
var hcopts = scope.ServiceProvider
.GetRequiredService<IOptionsSnapshot<HealthCheckOptions>>().Get(nameof(HealthCheckOptions));
scope.Dispose();
if (!string.IsNullOrWhiteSpace(hcopts.CacheDuration) && TimeSpan.TryParse(hcopts.CacheDuration, out TimeSpan cacheDuration))
{
options.CacheDuration = cacheDuration;
}
if (!string.IsNullOrWhiteSpace(hcopts.Timeout) && TimeSpan.TryParse(hcopts.Timeout, out TimeSpan timeout))
{
options.Timeout = timeout;
}
if (hcopts.AssembliesToScan != null && hcopts.AssembliesToScan.Length > 0)
{
options.AssembliesToScan = hcopts.AssembliesToScan.Select(Assembly.Load);
}
return services.AddHealthChecksSupport(options);
}
public static IServiceCollection AddHealthChecksSupport(this IServiceCollection services, Action<HealthCheckContainerOptions>? configure = null)
{
ArgumentNullException.ThrowIfNull(services, nameof(services));
ArgumentNullException.ThrowIfNull(configure, nameof(configure));
var options = new HealthCheckContainerOptions();
configure?.Invoke(options);
return services.AddHealthChecksSupport(options);
}
public static IServiceCollection AddHealthCheck<T>(this IServiceCollection services)
where T : class, IHealthCheck
=> services.AddCheck<T>();
public static IServiceCollection AddCheck<T>(this IServiceCollection services)
where T : class, IHealthCheck
{
services.TryAddTransient<IHealthCheck, T>();
return services;
}
public static IServiceCollection DiscoverHealthChecks(this IServiceCollection services)
{
// This will trigger the discovery when the container is built
var provider = services.BuildServiceProvider();
var container = provider.GetRequiredService<IHealthCheckContainer>();
container.DiscoverHealthChecks();
return services;
}
}

26
ImAliveHealthcheck.cs Normal file
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using MCVIngenieros.Healthchecks.Abstracts;
namespace MCVIngenieros.Healthchecks;
public class ImAliveHealthcheck : IHealthCheck
{
public int? RetryAttempts => 1;
public TimeSpan? Timeout => null;
public TimeSpan? RetryDelay => TimeSpan.Zero;
public HealthCheckSeverity? Severity => HealthCheckSeverity.Info;
public string? Description => "Simplest HealthCheck that can be done. It just says: API is alive.";
public Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default)
{
return Task.FromResult(new HealthCheckResult()
{
Details = "API is alive",
Severity = HealthCheckSeverity.Info,
IsHealthy = true
});
}
}

674
LICENSE.md Normal file
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
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The licenses for most software and other practical works are designed
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When we speak of free software, we are referring to freedom, not
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The Corresponding Source need not include anything that users
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The Corresponding Source for a work in source code form is that
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All rights granted under this License are granted for the term of
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@@ -0,0 +1,43 @@
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<OutputType>Library</OutputType>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>MCVIngenieros.Healthchecks</Title>
<Version>0.0.1</Version>
<Authors>mmorales99</Authors>
<Company>MANUEL JUAN MORALES AMAT</Company>
<Description>A READY-TO-USE HEALTHCHECK AID</Description>
<PackageProjectUrl>https://gitea.mcvingenieros.es/manuel</PackageProjectUrl>
<PackageReadmeFile>README.md</PackageReadmeFile>
<RepositoryUrl>https://gitea.mcvingenieros.es/manuel</RepositoryUrl>
<RepositoryType>git</RepositoryType>
<PackageTags>healthchecks;qa;easy;readytouse;tests</PackageTags>
<PackageLicenseFile>LICENSE.md</PackageLicenseFile>
<PackageRequireLicenseAcceptance>True</PackageRequireLicenseAcceptance>
<IncludeSymbols>True</IncludeSymbols>
<SymbolPackageFormat>snupkg</SymbolPackageFormat>
<IsPackable>true</IsPackable>
<GenerateDocumentationFile>False</GenerateDocumentationFile>
<SignAssembly>False</SignAssembly>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.3.0" />
</ItemGroup>
<ItemGroup>
<None Update="LICENSE.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
<None Update="README.md">
<Pack>True</Pack>
<PackagePath>\</PackagePath>
</None>
</ItemGroup>
</Project>

8
Options/HealthCheckOptions.cs Normal file
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namespace MCVIngenieros.Healthchecks.Options;
public class HealthCheckOptions
{
public string? CacheDuration { get; set; }
public string? Timeout { get; set; }
public string[]? AssembliesToScan { get; set; }
}

20
Options/HealthChecksConfigs.cs Normal file
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using MCVIngenieros.Healthchecks.Abstracts;
namespace MCVIngenieros.Healthchecks.Options;
public partial class HealthChecksConfigs
{
public string? Description { get; init; }
public int? RetryAttempts { get; init; }
public TimeSpan? Timeout { get; init; }
public TimeSpan? RetryDelay { get; init; }
public HealthCheckSeverity? Severity { get; init; }
public static readonly HealthChecksConfigs Default = new()
{
RetryAttempts = 2,
Timeout = TimeSpan.FromMinutes(5),
RetryDelay = TimeSpan.FromMilliseconds(100),
Severity = HealthCheckSeverity.Critical
};
}

12
Properties/launchSettings.json Normal file
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{
"profiles": {
"healthchecks": {
"commandName": "Project",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "https://localhost:62337;http://localhost:62338"
}
}
}

183
README.md Normal file
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@@ -0,0 +1,183 @@
# MCVIngenieros.Healthchecks
LICENCIA: [GNU General Public License v3.0](LICENSE.md)
Librería para la gestión y exposición de healthchecks personalizables en aplicaciones .NET. Permite definir múltiples chequeos de salud, exponerlos vía API y configurarlos fácilmente.
## ¿Cómo funciona?
1. Define tus healthchecks implementando la interfaz `IHealthCheck`.
2. Regístralos en el contenedor de servicios usando los métodos de extensión.
3. Opcionalmente, configura las opciones en `appsettings.json`.
4. Accede a los resultados mediante los endpoints expuestos por el controlador.
---
## Ejemplo de configuración en appsettings.json
```json appsettings.json
{
"HealthChecksConfigs": {
"CacheDuration": "00:30:00",
"Timeout": "00:00:05",
"AssembliesToScan": [
"MyAssembly"
],
"MyCheck": {
"RetryAttempts": 2,
"Timeout": "00:05:00",
"RetryDelay": "00:00:10",
"Severity": "Info"
}
}
}
```
## Ejemplo de configuración en CSharp
```csharp
builder.Services.AddHealthChecksSupport(); // <--- Usará la configuración de appsettings.json
builder.Services.AddHealthChecksSupport(options => {
options.AssembliesToScan.Add(typeof(Program).Assembly);
options.CacheDuration = TimeSpan.FromMinutes(10);
options.Timeout = TimeSpan.FromSeconds(5);
options.Threshold = 0.7;
});
```
## Ejemplo de uso en CSharp
```csharp
// Registro manual de healthchecks
builder.Services.AddHealthChecksSupport()
.AddCheck<CustomHealthCheck>("Custom");
// Registro automático de healthchecks
builder.Services.AddHealthChecksSupport()
.DiscoverHealthChecks();
```
### Ejemplo de implementación de un healthcheck personalizado
```csharp
public class CustomHealthCheck () : HealthCheck
{
public string Description => "Custom health check";
public Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default)
{
// Lógica de chequeo
return Task.FromResult(HealthCheckResult.Healthy("Todo OK"));
}
}
```
```csharp
public partial class HealthChecksConfigs : MCVIngenieros.Healthchecks.Options.HealthChecksConfigs
{
public const string CustomHealthCheckWithOptions = nameof(CustomHealthCheckWithOptions);
}
---
public class CustomHealthCheckWithOptions (IOptionsMonitor<HealthChecksConfigs> healthchecksConfig) : HealthCheck
{
private readonly HealthChecksConfigs hcConfig = healthchecksConfig.Get(HealthChecksConfigs.CustomHealthCheckWithOptions);
public string Description => hcConfig.Description;
public int? RetryAttempts => hcConfig.RetryAttempts ?? 2;
public TimeSpan? Timeout => hcConfig.Timeout ?? TimeSpan.FromSeconds(5);
public TimeSpan? RetryDelay => hcConfig.RetryDelay ?? TimeSpan.FromSeconds(1);
public HealthCheckSeverity? Severity => hcConfig.Severity ?? HealthCheckSeverity.Critical;
public Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default)
{
// Lógica de chequeo
return Task.FromResult(HealthCheckResult.Healthy("Todo OK"));
}
}
```
## Endpoints disponibles
La librería expone un controlador con endpoints como:
- `GET /health` — Estado general de la aplicación con detalle de todos los healthchecks.
- `GET /health/{nombre}` — Estado de un healthcheck específico.
Ejemplo de llamada con curl:
```bash
curl http://localhost:5000/health
curl http://localhost:5000/health/Database
```
_Si se envia Acept `*/*` o `text/html`, o se usa un User-Agent compatible, se devolverá un HTML con el estado de los healthchecks y una interfaz interactiva para la consulta y visualización de resultados. También permite ejecutar uno o varios checks al momento_
### Ejemplos avanzados
```json appsettings.json
{
"HealthChecksConfigs": {
"CacheDuration": "00:30:00",
"Timeout": "00:02:00",
"AssembliesToScan": [
"MCVIngenieros.Backend"
],
"MyCheck": {
"RetryAttempts": 5,
"Timeout": "00:00:30",
"RetryDelay": "00:00:10",
"Severity": "Critical"
}
}
}
```
```csharp
public partial class HealthChecksConfigs : MCVIngenieros.Healthchecks.Options.HealthChecksConfigs
{
public const string CustomHealthCheckWithOptions = nameof(CustomHealthCheckWithOptions);
}
---
public class CustomHealthCheckWithOptions (IDistributedCache redis, IOptionsMonitor<HealthChecksConfigs> healthchecksConfig) : HealthCheck
{
private readonly HealthChecksConfigs hcConfig = healthchecksConfig.Get(HealthChecksConfigs.CustomHealthCheckWithOptions);
public string Description => hcConfig.Description;
public int? RetryAttempts => hcConfig.RetryAttempts ?? 2;
public TimeSpan? Timeout => hcConfig.Timeout ?? TimeSpan.FromSeconds(5);
public TimeSpan? RetryDelay => hcConfig.RetryDelay ?? TimeSpan.FromSeconds(1);
public HealthCheckSeverity? Severity => hcConfig.Severity ?? HealthCheckSeverity.Critical;
public async Task<HealthCheckResult> CheckAsync(CancellationToken cancellationToken = default)
{
try
{
var result = await redis.GetStringAsync("healthcheck");
return result != null
? HealthCheckResult.Healthy("Todo OK", HealthCheckSeverity.Info)
: HealthCheckResult.Unhealthy(
"No se encontró el estado",
HealthCheckSeverity.Critical,
Data: new Dictionary<string, object?> {
{ "CacheKey", "healthcheck" },
{ "RedisValue", result },
{ "RedisInstance", redis.InstanceName }
});
}
catch (Exception ex)
{
return HealthCheckResult.Unhealthy(
"Error",
HealthCheckSeverity.Critical,
Exception: ex,
Data: new Dictionary<string, object?> {
{ "BaseException", ex.GetBaseException() },
{ "RedisInstance", redis.InstanceName }
});
}
}
}
```

230
__/HealthCheckContainer.cs Normal file
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using MCVIngenieros.Healthchecks.Abstracts;
using MCVIngenieros.Healthchecks.Options;
using Microsoft.Extensions.Options;
using System.Collections.Concurrent;
using System.Collections.Immutable;
using System.ComponentModel;
using System.Reflection;
namespace MCVIngenieros.Healthchecks.__;
// Health check container implementation
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed class HealthCheckContainer : IHealthCheckContainer, IDisposable
{
private readonly IServiceProvider provider;
private readonly ILogger<HealthCheckContainer> _logger;
private readonly TimeSpan _cacheDuration;
private readonly TimeSpan? _timeout;
private readonly static ConcurrentDictionary<string, Type> _checkTypes = new();
private readonly ConcurrentDictionary<string, (HealthCheckResult Result, DateTime LastUpdate)> _cache = new();
private readonly CancellationTokenSource _cts = new();
private readonly Task _backgroundTask;
private readonly Assembly[]? _assembliesToScan;
public HealthCheckContainer(IServiceProvider provider, ILogger<HealthCheckContainer> logger, IOptions<HealthCheckContainerOptions> options)
{
this.provider = provider;
_logger = logger;
_cacheDuration = options.Value.CacheDuration;
_timeout = options.Value.Timeout;
_assembliesToScan = options.Value.AssembliesToScan?.ToArray() ?? null;
_assembliesToScan = _assembliesToScan?.Distinct().ToArray();
LoadHealthChecks();
// Start background refresh
_backgroundTask = Task.Run(() => BackgroundRefreshAsync(_cts.Token));
}
public void LoadHealthChecks()
{
var checks = provider.GetServices<IHealthCheck>();
foreach (var check in checks)
{
var type = check.GetType();
if (_checkTypes.TryAdd(type.Name, type))
{
_logger.LogInformation($"Loaded health check: {type.Name}");
}
else
{
_logger.LogInformation($"Health check {type.Name} is already registered. Skipping duplicate.");
}
}
}
// Discover all IHealthCheck implementations in loaded assemblies
public void DiscoverHealthChecks()
{
if (_assembliesToScan == null)
return;
foreach (var assembly in _assembliesToScan)
{
var checkTypes = assembly.GetTypes()
.Where(t => typeof(IHealthCheck).IsAssignableFrom(t) && !t.IsInterface && !t.IsAbstract);
assembly.GetReferencedAssemblies()
.Select(Assembly.Load)
.ToList()
.ForEach(a =>
{
var types = a.GetTypes()
.Where(t => typeof(IHealthCheck).IsAssignableFrom(t) && !t.IsInterface && !t.IsAbstract);
checkTypes = checkTypes.Concat(types);
});
checkTypes = checkTypes.Distinct();
foreach (var type in checkTypes)
{
if (_checkTypes.TryAdd(type.Name, type))
{
_logger.LogInformation($"Discovered health check: {type.Name}");
}
else
{
_logger.LogInformation($"Health check {type.Name} is already registered. Skipping duplicate.");
}
}
}
}
public IReadOnlyList<string> GetAllCheckNames() => [.. _checkTypes.Keys];
public async Task<List<HealthCheckResult>> RunAllChecks(CancellationToken cancellationToken = default)
{
_logger.LogInformation("Running all health checks...");
var tasks = _checkTypes.Keys.Select(name => RunCheck(name, cancellationToken));
var results = await Task.WhenAll(tasks);
_logger.LogInformation("Completed running all health checks.");
return results.Where(r => r != null).ToList()!;
}
public Task<List<HealthCheckResult>> GetAllChecksResults(CancellationToken cancellationToken = default)
{
var results = new List<HealthCheckResult>();
foreach (var item in _cache)
{
results.Add(item.Value.Result);
}
return Task.FromResult(results);
}
public async Task<HealthCheckResult?> RunCheck(string name, CancellationToken cancellationToken = default)
{
var now = DateTime.UtcNow;
_logger.LogInformation($"Running health check: {name}");
if (!_checkTypes.TryGetValue(name, out var type))
{
_logger.LogWarning($"Health check {name} not found.");
return null;
}
if (_cache.TryGetValue(name, out var cached) && now - cached.LastUpdate < _cacheDuration)
{
_logger.LogInformation($"Returning cached result for {name}.");
return cached.Result;
}
var result = await RunCheckInstanceAsync(type, cancellationToken);
_cache[name] = (result, DateTime.UtcNow);
_logger.LogInformation($"Health check {name} completed. Result: {(result.IsHealthy ? "Healthy" : "Unhealthy")}");
return result;
}
public async Task<List<HealthCheckResult>> RunChecks(IEnumerable<string> names, CancellationToken cancellationToken = default)
{
_logger.LogInformation($"Running health checks: {string.Join(", ", names)}");
var tasks = names.Select(name => RunCheck(name, cancellationToken));
var results = await Task.WhenAll(tasks);
_logger.LogInformation($"Completed running specified health checks. Runned {results.Count(r => r != null)} checks.");
return results.Where(r => r != null).ToList()!;
}
// Background refresh of all checks
private async Task BackgroundRefreshAsync(CancellationToken cancellationToken)
{
while (!cancellationToken.IsCancellationRequested)
{
try
{
var tasks = _checkTypes.Keys.Select(name => RunCheck(name, cancellationToken));
await Task.WhenAll(tasks);
}
catch (Exception ex)
{
_logger.LogError(ex, "Error during background health check refresh");
}
await Task.Delay(_cacheDuration, cancellationToken);
}
}
// Run a single check instance with timeout, retry, circuit breaker, fallback
private async Task<HealthCheckResult> RunCheckInstanceAsync(Type type, CancellationToken cancellationToken)
{
_logger.LogInformation($"Starting health check: {type.Name}");
var name = type.Name;
var logger = provider.GetService(typeof(ILogger<>).MakeGenericType(type)) as ILogger;
try
{
IHealthCheck? check = ActivatorUtilities.CreateInstance(provider, type) as IHealthCheck
?? throw new InvalidOperationException($"Could not create health check: {name}");
var retry = check.RetryAttempts ?? HealthChecksConfigs.Default.RetryAttempts;
TimeSpan timeout = (TimeSpan)((check.Timeout ?? _timeout) ?? HealthChecksConfigs.Default.Timeout!);
TimeSpan delay = (TimeSpan)(check.RetryDelay ?? HealthChecksConfigs.Default.RetryDelay!);
for (int attempt = 0; attempt <= retry; attempt++)
{
try
{
using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(timeout);
var result = await check.CheckAsync(cts.Token);
_logger.LogInformation($"Health check {name} completed. Result: {(result.IsHealthy ? "Healthy" : "Unhealthy")}");
result.Name = name;
return result;
}
catch (Exception ex)
{
logger?.LogError(ex, $"Health check {name} failed on attempt {attempt + 1} -- Exception was not controlled.");
if (attempt == retry)
{
return new HealthCheckResult(false)
{
Name = name,
Details = $"Exception: {ex.GetBaseException().Message} -- StackTrace: {ex.GetBaseException().StackTrace}",
Severity = HealthCheckSeverity.Critical
};
}
await Task.Delay(delay, cancellationToken);
}
}
}
catch (Exception ex)
{
_logger.LogError(ex.GetBaseException(), $"Error creating instance of health check {name}");
return new HealthCheckResult(false) { Name = name, Details = $"Error creating instance: {ex.GetBaseException().Message}", Severity = HealthCheckSeverity.Critical };
}
return new HealthCheckResult(false) { Name = name, Details = "Unknown error", Severity = HealthCheckSeverity.Critical };
}
public void Dispose()
{
_cts.Cancel();
_backgroundTask?.Dispose();
_cts.Dispose();
}
public IReadOnlyDictionary<string, IHealthCheck> GetAllChecks()
{
var dict = new Dictionary<string, IHealthCheck>();
foreach (var item in _checkTypes.ToImmutableDictionary())
{
IHealthCheck? check = (IHealthCheck?)ActivatorUtilities.CreateInstance(provider, item.Value);
if (check == null) continue;
dict[item.Key] = check;
}
return dict.ToImmutableDictionary();
}
}

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__/HealthCheckContainerOptions.cs Normal file
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using System.ComponentModel;
namespace MCVIngenieros.Healthchecks.__;
// Options for health check container
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed class HealthCheckContainerOptions
{
public TimeSpan CacheDuration { get; set; } = TimeSpan.FromMinutes(10);
public TimeSpan Timeout { get; set; } = TimeSpan.FromSeconds(3);
public IEnumerable<System.Reflection.Assembly> AssembliesToScan { get; set; } = [];
}

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__/__Controllers/HealthCheckController.cs Normal file
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using MCVIngenieros.Healthchecks.Abstracts;
using Microsoft.AspNetCore.Mvc;
using System.ComponentModel;
using System.Drawing;
using System.Net.Mime;
namespace MCVIngenieros.Healthchecks.__.__Controllers;
[ApiController, Route("api/health"), EditorBrowsable(EditorBrowsableState.Never)]
public sealed class HealthCheckController(IHealthCheckContainer container, ILogger<HealthCheckController> logger) : ControllerBase
{
private readonly IHealthCheckContainer _container = container;
private readonly ILogger<HealthCheckController> _logger = logger;
[HttpGet]
public async Task<IActionResult> Run([FromQuery] string? checks = null, CancellationToken cancellationToken = default)
{
_logger.LogInformation($"Health check requested for checks: {checks ?? "ALL"}");
List<HealthCheckResult> results;
if (!string.IsNullOrEmpty(checks))
{
var names = checks.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
await _container.RunChecks(names, cancellationToken);
}
else
{
await _container.RunAllChecks(cancellationToken);
}
results = await _container.GetAllChecksResults(cancellationToken);
var status = results.All(r => r.IsHealthy) ? "Healthy" : "Unhealthy";
var code = results.All(r => r.IsHealthy) ? 200 : 503;
var acceptHeader = Request.Headers.Accept.ToString();
var userAgent = Request.Headers.UserAgent.ToString();
if (IsBrowser(Request))
{
return Content(RenderHtml(status, results, _container), MediaTypeNames.Text.Html);
}
else
{
var response = new
{
status,
results = results.ToDictionary(r => r.Name, r => new { isHealthy = r.IsHealthy, details = r.Details, severity = r.Severity.ToString() })
};
return StatusCode(code, response);
}
}
[HttpGet, Route("{checkName}")]
public async Task<IActionResult> Get([FromRoute] string checkName, CancellationToken cancellationToken = default)
{
var result = await _container.RunCheck(checkName, cancellationToken);
if (result == null)
{
_logger.LogWarning($"Health check '{checkName}' not found.");
return NotFound();
}
_logger.LogWarning($"Health check requested for {checkName}.");
var status = result.IsHealthy ? "Healthy" : "Unhealthy";
var code = result.IsHealthy ? 200 : 503;
var response = new
{
status,
result = result == null ? null : new { isHealthy = result.IsHealthy, details = result.Details, severity = result.Severity.ToString() }
};
return StatusCode(code, response);
}
private static bool UserAgentIndicatesBrowser(string userAgent)
=> !string.IsNullOrEmpty(userAgent) && (
userAgent.Contains("Mozilla", StringComparison.OrdinalIgnoreCase)
|| userAgent.Contains("Chrome", StringComparison.OrdinalIgnoreCase)
|| userAgent.Contains("Safari", StringComparison.OrdinalIgnoreCase)
|| userAgent.Contains("Edge", StringComparison.OrdinalIgnoreCase)
);
private static bool AcceptsHtml(string acceptHeader)
=> !string.IsNullOrEmpty(acceptHeader)
&& acceptHeader.Contains("text/html", StringComparison.OrdinalIgnoreCase);
private static bool IsBrowser(HttpRequest request)
=> AcceptsHtml(request.Headers["Accept"].ToString())
|| UserAgentIndicatesBrowser(request.Headers["User-Agent"].ToString());
private static string GetSeverityClases()
{
var severitiesDict = Enum.GetValues<HealthCheckSeverity>()
.Cast<HealthCheckSeverity>()
.ToDictionary(e => (int)e, e => e.ToString());
var totalSeverities = severitiesDict.Count;
var colores = ColorInterpolation.GenerateColorGradient(totalSeverities);
string cssClasses = string.Empty;
int i = 0;
foreach (var item in severitiesDict)
{
string cssClass = $".{item.Value}{{ color: {colores[i++]}; font-weight: bold; }}";
cssClasses += cssClass + Environment.NewLine;
}
return cssClasses;
}
// Render HTML page for browser
private static string RenderHtml(string status, List<HealthCheckResult> results, IHealthCheckContainer container)
{
var severitiesDict = Enum.GetValues<HealthCheckSeverity>()
.Cast<HealthCheckSeverity>()
.ToDictionary(e => (int)e, e => e.ToString());
var healthy = status == "Healthy";
var bannerColor = healthy ? "#4caf50" : "#f44336";
var html = $@"<!DOCTYPE html>
<html lang=""en"">
<head>
<meta charset=""UTF-8"">
<meta name=""viewport"" content=""width=device-width, initial-scale=1.0"">
<title>Health Checks</title>
<style>
body {{ font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f5f5f5; }}
.banner {{ background: {bannerColor}; color: #fff; padding: 1.5rem; text-align: center; font-size: 2rem; }}
.container {{ max-width: 900px; margin: 2rem auto; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); padding: 2rem; }}
table {{ width: 100%; border-collapse: collapse; margin-top: 1rem; }}
th, td {{ padding: 0.75rem; border-bottom: 1px solid #eee; text-align: left; }}
td.clickable:hover {{ background: #f0f0f0; cursor: pointer; }}
th {{ background: #fafafa; }}
tr:last-child td {{ border-bottom: none; }}
td > label {{ width: 100%; height: 100%; cursor: pointer; padding: 0; display: block; }}
td > label > input[type=""checkbox""] {{ width: 1.5em; height: 1.5em; color: #000000; accent-color: #4caf50; cursor: pointer; }}
.healthy {{ color: #4caf50; font-weight: bold; }}
.unhealthy {{ color: #f44336; font-weight: bold; }}
{GetSeverityClases()}
@media (max-width: 600px) {{
.container {{ padding: 0.5rem; }}
.banner {{ font-size: 1.2rem; }}
table, th, td {{ font-size: 0.9rem; }}
}}
.run-single {{ margin-top: 2rem; }}
.run-single button {{ padding: 0.5rem 1rem; background: #2196f3; color: #fff; border: none; border-radius: 4px; cursor: pointer; }}
.run-single button:hover {{ background: #1976d2; }}
/* Modal styles */
.modal {{ display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background: rgba(0,0,0,0.4); }}
.modal-content {{ background: #fff; margin: 10% auto; padding: 2rem; border-radius: 8px; max-width: 500px; position: relative; }}
.close {{ position: absolute; top: 10px; right: 20px; font-size: 2rem; color: #888; cursor: pointer; }}
.modal-content pre {{ background: #f5f5f5; padding: 1em; border-radius: 4px; overflow-x: auto; }}
</style>
</head>
<body>
<div class=""banner"">Health Status: {status}</div>
<div class=""container"">
<h2>Health Check Results</h2>
<table id=""ChecksTable"">
<thead>
<tr><th>Selected</th><th>Name</th><th>Status</th><th>Severity</th><th>Details</th></tr>
</thead>
<tbody>
{string.Join("", results.Select((r, idx) => $"<tr data-idx='{idx}' class='row-hover'>" +
@$"<td><label class='custom-checkbox'><input type='checkbox' name='checks' value='{r.Name}'></label></td>" +
$"<td class='clickable'>{r.Name.Replace("HealthCheck", "", StringComparison.OrdinalIgnoreCase)}</td>" +
$"<td class='clickable {(r.IsHealthy ? "healthy" : "unhealthy")}'>{(r.IsHealthy ? "Healthy" : "Unhealthy")}</td>" +
@$"<td class='clickable " + r.Severity + @$"'>{r.Severity}</td>" +
$"<td class='clickable'>{System.Net.WebUtility.HtmlEncode(r.Details)}</td>" +
"</tr>"))}
</tbody>
</table>
<div class=""run-single"">
<h3>Run Selected Checks</h3>
<form id=""runChecksForm"" method=""get"" action=""/api/healthcheck"" onsubmit=""event.preventDefault(); runSelectedChecks();"">
<button type=""submit"">Run</button>
</form>
</div>
<div id=""modal"" class=""modal"">
<div class=""modal-content"">
<span class=""close"" onclick=""closeModal()"">&times;</span>
<h3 id=""modalTitle""></h3>
<div id=""modalBody""></div>
</div>
</div>
<script>
const results = {System.Text.Json.JsonSerializer.Serialize(results)};
const tests = {System.Text.Json.JsonSerializer.Serialize(container.GetAllChecks())}
const severities = {System.Text.Json.JsonSerializer.Serialize(severitiesDict)}
function getSeverity(severity){{
return severities[severity] ?? ""Critical""
}}
function getSeverityClass(severity){{
return severities[severity] ?? ""Critical""
}}
function runSelectedChecks() {{
const table = document.getElementById('ChecksTable');
const selected = Array.from(table.querySelectorAll('input[name=\'checks\']:checked')).map(cb => cb.value);
if(selected.length === 0) {{
return;
}}
const url = '/api/healthcheck?checks=' + encodeURIComponent(selected.join(','));
window.location = url;
}}
// Modal logic
function closeModal() {{
document.getElementById('modal').style.display = 'none';
}}
document.addEventListener('DOMContentLoaded', function() {{
var table = document.getElementById('ChecksTable');
table.querySelectorAll('tbody tr').forEach(function(row) {{
row.querySelectorAll('td.clickable').forEach(function(cell) {{
cell.addEventListener('click', function() {{
const idx = row.getAttribute('data-idx');
const r = results[idx];
const test = tests[r.Name];
const config = (({{ RetryAttempts, RetryDelay, Timeout }}) => ({{ RetryAttempts, RetryDelay, Timeout }}))(test);
const severity = getSeverity(r.Severity);
const description = test.Description;
let html = '';
html += '<p><b>Description:</b> ' + description + '</p>';
html += '<p><b>Severity:</b> <span class=""' + severity + '"">' + severity + '</span></p>';
html += '<p><b>Config:</b> <pre>' + (typeof config === 'object' ? JSON.stringify(config, null, 2) : config) + '</pre></p>';
html += '<p><b>Is Healthy:</b> ' + '<span class=""' +(r.IsHealthy ? 'healthy' : 'unhealthy')+ '"">' + (r.IsHealthy ? 'Yes' : 'No') + '</span></p>';
html += '<p><b>Last execution details:</b> <pre>' + r.Details + '</pre><p>';
document.getElementById('modalTitle').innerText = r.Name;
document.getElementById('modalBody').innerHTML = html;
document.getElementById('modal').style.display = 'block';
}});
}});
}});
window.onclick = function(event) {{
var modal = document.getElementById('modal');
if (event.target == modal) {{
closeModal();
}}
}};
}});
</script>
</div>
</body>
</html>";
return html;
}
public class ColorInterpolation
{
// Convierte un código hex a Color
private static Color HexToColor(string hex)
{
return ColorTranslator.FromHtml(hex);
}
// Convierte Color a código hex
private static string ColorToHex(Color color)
{
return $"#{color.R:X2}{color.G:X2}{color.B:X2}";
}
// Interpola entre dos colores según factor (0 a 1)
private static Color InterpolateColor(Color start, Color end, double factor)
{
int r = (int)(start.R + factor * (end.R - start.R));
int g = (int)(start.G + factor * (end.G - start.G));
int b = (int)(start.B + factor * (end.B - start.B));
return Color.FromArgb(r, g, b);
}
// Genera una lista de colores interpolados para n valores
public static List<string> GenerateColorGradient(int n)
{
var startColor = HexToColor("#4caf50"); // verde
var midColor = HexToColor("#e5be01"); // amarillo
var endColor = HexToColor("#f44336"); // rojo
var colors = new List<string>(n);
for (int i = 0; i < n; i++)
{
double factor = (double)i / (n - 1);
if (factor <= 0.5)
{
double localFactor = factor / 0.5;
var c = InterpolateColor(startColor, midColor, localFactor);
colors.Add(ColorToHex(c));
}
else
{
double localFactor = (factor - 0.5) / 0.5;
var c = InterpolateColor(midColor, endColor, localFactor);
colors.Add(ColorToHex(c));
}
}
return colors;
}
}
}

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healthchecks.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.2.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MCVIngenieros.Healthchecks", "MCVIngenieros.Healthchecks.csproj", "{9D4D28DE-7C25-08C4-0A37-9E0E9439A1F0}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{9D4D28DE-7C25-08C4-0A37-9E0E9439A1F0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{9D4D28DE-7C25-08C4-0A37-9E0E9439A1F0}.Debug|Any CPU.Build.0 = Debug|Any CPU
{9D4D28DE-7C25-08C4-0A37-9E0E9439A1F0}.Release|Any CPU.ActiveCfg = Release|Any CPU
{9D4D28DE-7C25-08C4-0A37-9E0E9439A1F0}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {30D89C0F-E469-4E8D-BEF7-C91EC94F6D0E}
EndGlobalSection
EndGlobal