.NET Core使用Consul服务注册与发现

一、新建项目ConsulWebRegCore

Nuget

<PackageReference Include="Consul" Version="1.6.1.1" />
           

二、配置文件appsettings.json

{
  "ip": "192.168.1.108",
  "port": "28903"
}
           

三、服务注册

Startup.cs

using Consul;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace ConsulWebRegCore
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddHealthChecks();
            services.AddControllers();
        }
        public void ConsulConfig(ConsulClientConfiguration c)
        {
            c.Address = new Uri("http://192.168.1.117:8500");
            c.Datacenter = "dc1";
        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IHostApplicationLifetime applicationLifetime)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapHealthChecks("/health");
            });

            string ip = Configuration["ip"];
            int port = int.Parse(Configuration["port"]);
            string serviceName = "ConsulWebRegCore";
            string serviceId = serviceName + Guid.NewGuid();
            using (var client = new ConsulClient(ConsulConfig))
            {
                //注册服务到Consul
                client.Agent.ServiceRegister(new AgentServiceRegistration()
                {
                    ID = serviceId, //服务编号，不能重复
                    Name = serviceName, //服务名字
                    Address = ip,
                    Port = port, 
                    Check = new AgentServiceCheck
                    {
                        DeregisterCriticalServiceAfter = TimeSpan.FromSeconds(5), //服务停止多久后反注册
                        Interval = TimeSpan.FromSeconds(10), 
                        HTTP = $"http://{ip}:{port}/health", 
                        Timeout = TimeSpan.FromSeconds(5)
                    }

                }).Wait();
            }

            applicationLifetime.ApplicationStopped.Register(() =>
            {
                using (var client = new ConsulClient(ConsulConfig))
                {
                    //注销服务
                    //client.Agent.ServiceDeregister(serviceId).Wait();
                }
            });

            app.UseEndpoints(endpoints =>
                {
                    endpoints.MapControllers();
                });
        }
    }
}
           

四、服务发现

WeatherForecastController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace ConsulWebRegCore.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        public IActionResult Get()
        {

            using (var consul = new Consul.ConsulClient(c =>
            {
                c.Address = new Uri("http://192.168.1.117:8500");
            }))
            {
                //取出全部的MsgService服务
                var services = consul.Agent.Services().Result.Response.Values.Where(p => p.Service.Equals("ConsulWebRegCore", StringComparison.OrdinalIgnoreCase));

                //客户端负载均衡，随机选出一台服务
                Random rand = new Random();
                var index = rand.Next(services.Count());
                var s = services.ElementAt(index);

                return Ok($"Index={index},ID={s.ID},Service={s.Service},Addr={s.Address},Port={s.Port}");
            }


        }
    }
}
           

五、运行效果