Log,Metrics,Tracing是为服务正常运行保驾护航的三件套,前面有介绍过Log和Metrics,本篇说明说一下Tracing。Tracing的思路和Metrics一样,通过三方服务,来达成效果,这里选用的是Jaeger,通过在MiniAPI项目中引入Jaeger和OpenTracing的库,来向Jaeger推送跟踪数据,通过访问
http://localhost:16686/search,来查看跟踪结果。
Jaeger下载地址:
https://www.jaegertracing.io/download/
接来了定议两个项目,Order项目和Stock项目,Order通过httpclient调用Stock来查看商品库存,这样,两个项目就开成了一个调用链路。
Order项目
using Jaeger;
using OpenTracing.Propagation;
using OpenTracing;
using OpenTracing.Util;
using Jaeger.Samplers;
using Jaeger.Senders.Thrift;
using Jaeger.Senders;
using Jaeger.Reporters;
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddHttpClient();
//注入OpenTracing服务
builder.Services.AddOpenTracing();
builder.Services.AddSingleton<ITracer>(serviceProvider =>
{
var serviceName = serviceProvider.GetRequiredService<IWebHostEnvironment>().ApplicationName;
var loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();
//配置跟踪
Jaeger.Configuration.SenderConfiguration.DefaultSenderResolver = new SenderResolver(loggerFactory)
.RegisterSenderFactory<ThriftSenderFactory>();
var tracer = new Tracer.Builder(serviceName)
//添加日志框架
.WithLoggerFactory(loggerFactory)
//添加数据采集器
.WithSampler(new ConstSampler(true))
.Build();
//注册全局跟踪器
GlobalTracer.Register(tracer);
return tracer;
});
var app = builder.Build();
app.MapGet("/order", async (ILogger<Program> logger, IHttpClientFactory clientFactory, ITracer tracer) =>
{
using (var scope = tracer.BuildSpan("订单系统").StartActive(true))
{
logger.LogInformation("订单查询库存");
var client = clientFactory.CreateClient();
var content = await client.GetStringAsync("http://localhost:5160/stock/D0001");
return $"stock调用结果:{content}";
}
});
app.Run();
Stock项目
using Jaeger;
using Jaeger.Reporters;
using Jaeger.Samplers;
using Jaeger.Senders;
using Jaeger.Senders.Thrift;
using OpenTracing;
using OpenTracing.Util;
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddOpenTracing();
builder.Services.AddSingleton<ITracer>(serviceProvider =>
{
var serviceName = serviceProvider.GetRequiredService<IWebHostEnvironment>().ApplicationName;
var loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();
Jaeger.Configuration.SenderConfiguration.DefaultSenderResolver = new SenderResolver(loggerFactory)
.RegisterSenderFactory<ThriftSenderFactory>();
var tracer = new Tracer.Builder(serviceName)
.WithLoggerFactory(loggerFactory)
.WithSampler(new ConstSampler(true))
.Build();
GlobalTracer.Register(tracer);
return tracer;
});
var app = builder.Build();
app.MapGet("/stock/{no}", (string no, ILogger<Program> logger, ITracer tracer) =>
{
using (var scope = tracer.BuildSpan("库存系统").StartActive(true))
{
logger.LogInformation("按{0}查询库存", no);
return new Product { No = no, Quantity = 1324, Name = "Surface Go 3" };
}
});
app.Run();
public class Product
{
public string? No { get; set; }
public string? Name { get; set; }
public int Quantity { get; set; }
}
用命令行运行下载的jaeger-all-in-one.exe,在浏览器或postman访问Order项目的/order地址,再进入Jaeger,查看结果:
http://localhost:16686/search
通过上面的UI,可以很方便地查看请求链条上的调用,当调用关系很复杂时,特别有用。
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