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HealthController.cs
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HealthController.cs
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using Company.Product.WebApi.Api.Caching;
using Company.Product.WebApi.Api.Results;
using Company.Product.WebApi.Data;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using Swashbuckle.AspNetCore.Annotations;
using ActionResult = Company.Product.WebApi.Api.Results.ActionResult;
namespace Company.Product.WebApi.Api.Controllers.Health;
[Route("health")]
public sealed class HealthController : ControllerBase
{
private static readonly Guid DatabaseHealthCacheKey = Guid.NewGuid();
private readonly DatabaseContext _databaseContext;
private readonly IMemoryCache _memoryCache;
public HealthController(IMemoryCache memoryCache, DatabaseContext databaseContext)
{
ThrowIfNull(memoryCache);
ThrowIfNull(databaseContext);
_memoryCache = memoryCache;
_databaseContext = databaseContext;
}
[HttpGet]
[SwaggerOperation("Reports on the health of the API.")]
[ProducesResponseType(StatusCodes.Status200OK, Type = typeof(IStandardJsonResult<GetHealthResultData>))]
public async Task<StandardJsonActionResult> GetAsync(CancellationToken cancellationToken = default)
{
var databaseHealth =
await _memoryCache.ThreadSafeLazyGetOrCreate(
DatabaseHealthCacheKey,
async entry =>
{
try
{
_ = await _databaseContext.Database.ExecuteSqlRawAsync("SELECT NULL;", cancellationToken);
return DatabaseHealth.Healthy;
}
catch (Exception ex)
{
_ = ex;
return DatabaseHealth.Unhealthy;
}
},
new MemoryCacheEntryOptions { AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(1) });
var resultData = new GetHealthResultData(ApiHealth.Healthy, databaseHealth);
var healthy = resultData.ApiHealth == ApiHealth.Healthy && resultData.DatabaseHealth == DatabaseHealth.Healthy;
return ActionResult
.Ok()
.AsStandardJson(resultData)
.WithMessage($"The API is {(healthy ? "" : "not ")}functioning normally.");
}
}