程序員開發(fā)程序，是“生”的過程，運(yùn)維人員負(fù)責(zé)日常運(yùn)維，是“養(yǎng)”的過程，在養(yǎng)的過程，運(yùn)維人員希望在第一時(shí)間了解程序的狀況，健康檢查，是最基礎(chǔ)的手段。

var builder = WebApplication.CreateBuilder(args); //注入健康檢查服務(wù) builder.Services.AddHealthChecks(); var?app?=?builder.Build(); app.MapGet("/test", () => {????return?DateTime.Now; }); //添加中間件，設(shè)置健康檢查的訪問路徑是/health app.MapHealthChecks("/health"); app.Run();

還可以通過重寫來改變返回的字符串：

app.MapHealthChecks("/health", new HealthCheckOptions {ResponseWriter = (context, result) =>{var backContent = "this is health";return context.Response.WriteAsync(backContent);} });

當(dāng)然，這樣的健康檢查只是host有沒有啟動(dòng)，如果有更深層次的檢查，可以通過實(shí)現(xiàn)IHealthCheck來實(shí)現(xiàn)。

using?Microsoft.Extensions.Diagnostics.HealthChecks;var?builder?=?WebApplication.CreateBuilder(args); //注入自定義健康檢查類 builder.Services.AddHealthChecks().AddCheck<TestHealthCheck>("test_health_check"); var app = builder.Build(); app.MapGet("/test",?()?=> {return DateTime.Now; }); //添加中間件，設(shè)置健康檢查的訪問路徑是/health app.MapHealthChecks("/health"); app.Run();public class TestHealthCheck : IHealthCheck {public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default){//這是一個(gè)三方的獲取空閑內(nèi)存的庫(kù)var client = new MemoryMetricsClient();var?metrics?=?client.GetMetrics();?????Console.WriteLine("Free : " + metrics.Free);//假業(yè)務(wù)要求，內(nèi)存大于1000M，就健康var healthCheckResultHealthy = metrics.Free > 1000;if (healthCheckResultHealthy){return Task.FromResult(HealthCheckResult.Healthy("healthy"));}return Task.FromResult(new HealthCheckResult(context.Registration.FailureStatus,"unhealthy"));} }

??有了這個(gè)實(shí)現(xiàn)，就可以很方便地實(shí)現(xiàn)業(yè)務(wù)中的各種判定服務(wù)是否健康了。

上面的所有健康檢查都是拉模式，意思就是外部監(jiān)控服務(wù)會(huì)請(qǐng)求本服務(wù)的/health，獲取信息，來判定是否健康，在asp.net core也提供了推的模式，如下：

using Microsoft.Extensions.Diagnostics.HealthChecks; using MiniDemo05;var builder = WebApplication.CreateBuilder(args);builder.Services.AddHealthChecks().AddCheck<TestHealthCheck>("test_health_check"); //配置推送的參數(shù) builder.Services.Configure<HealthCheckPublisherOptions>(options => {options.Delay = TimeSpan.FromSeconds(1);options.Period?=?TimeSpan.FromSeconds(5); }); //注入推送服務(wù) builder.Services.AddSingleton<IHealthCheckPublisher, HealthPublisher>();var app = builder.Build();app.MapGet("/test", () => {return DateTime.Now; });app.Run();public class TestHealthCheck : IHealthCheck {public Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default){var client = new MemoryMetricsClient();var metrics = client.GetMetrics();Console.WriteLine("Total: " + metrics.Total);Console.WriteLine("Used : " + metrics.Used);Console.WriteLine("Free : " + metrics.Free);var healthCheckResultHealthy = metrics.Free > 6000;if (healthCheckResultHealthy){return Task.FromResult(HealthCheckResult.Healthy("healthy"));}return Task.FromResult(new HealthCheckResult(context.Registration.FailureStatus,"unhealthy"));} } public class HealthPublisher : IHealthCheckPublisher {private readonly ILogger<HealthPublisher> _logger;public HealthPublisher(ILogger<HealthPublisher> logger){_logger = logger;}public Task PublishAsync(HealthReport report, CancellationToken cancellationToken){_logger.LogInformation($"{DateTime.Now.ToString()},{ report.Status}");return?Task.CompletedTask;} }

如果監(jiān)控參數(shù)收集是一個(gè)url，我們可以在HealthPublisher中把健康的結(jié)果推送上去。

總結(jié)

以上是生活随笔為你收集整理的.NET6之MiniAPI(十三)：健康检查的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。