ocelot集成consul服务发现

首先下载consul 点击这里下载
转到解压文件夹目录输入cmd命令 consul agent -dev （有时候会卡住按一下方向键上）
在浏览器中输入http://localhost:8500/ui 查看是否安装成功成功如下图所示
在网站启动的时候注册服务，网站停止的时候卸载服务。

服务的注册

先引用consul nuget包

添加配置文件

{
...
  "ServiceDiscovery": {
    "ServiceName": "DataService",
    "Consul": {
      "HttpEndpoint": "http://127.0.0.1:8500",
      "DnsEndpoint": { "Address": "127.0.0.1", "Port": 8600 } } } }

public class ServiceDisvoveryOptions
{
    public string ServiceName { get; set; }

    public ConsulOptions Consul { get; set; }
}

public class ConsulOptions
{
    public string HttpEndpoint { get; set; }

    public DnsEndpoint DnsEndpoint { get; set; } } public class DnsEndpoint { public string Address { get; set; } public int Port { get; set; } public IPEndPoint ToIPEndPoint() { return new IPEndPoint(IPAddress.Parse(Address), Port); } }

在网站启动和卸载的时候添加对应注册和卸载事件

   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.AddDbContext<UserContext>(options => { options.UseMySQL(Configuration.GetConnectionString("MysqlUser")); }); //从配置文件中获取ServiceDiscovery services.Configure<ServiceDisvoveryOptions>(Configuration.GetSection("ServiceDiscovery")); //单例注册ConsulClient services.AddSingleton<IConsulClient>(p => new ConsulClient(cfg => { var serviceConfiguration = p.GetRequiredService<IOptions<ServiceDisvoveryOptions>>().Value; if (!string.IsNullOrEmpty(serviceConfiguration.Consul.HttpEndpoint)) { // if not configured, the client will use the default value "127.0.0.1:8500" cfg.Address = new Uri(serviceConfiguration.Consul.HttpEndpoint); } })); services.AddMvc(); //添加授权相关代码 services.AddAuthentication(options => { options.DefaultAuthenticateScheme = "Cookies"; options.DefaultChallengeScheme = "oidc"; }) .AddCookie("Cookies") .AddOpenIdConnect(//配置授权信息相关 "oidc", options => { options.SignInScheme = "Cookies"; options.Authority = "http://localhost:52619";//授权地址 options.RequireHttpsMetadata = false;//ssl证书 options.ResponseType = OpenIdConnectResponseType.CodeIdToken; options.ClientId = "MVC"; options.ClientSecret = "Secret"; options.SaveTokens = true; // options.GetClaimsFromUserInfoEndpoint = true;//发起另外一个请求~52619/content/userInfo 获取userinfo //options.ClaimActions.MapJsonKey("sub", "sub"); //options.ClaimActions.MapJsonKey("preferred_username", "preferred_username"); //options.ClaimActions.MapJsonKey("sub", "sub"); //options.ClaimActions.MapJsonKey("avatar", "avatar"); //options.ClaimActions.MapCustomJson("role", jobject => jobject["role"].ToString()); options.Scope.Add("geteway_api"); options.Scope.Add("openid"); options.Scope.Add("profile"); options.Scope.Add("offline_access"); //options.Scope.Add("email");  } );//添加  } // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory LoggerFactory, IApplicationLifetime lifetime, IConsulClient consulClient, IOptions<ServiceDisvoveryOptions> DisvoveryOptions) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } app.UseMvc(); app.UseAuthentication(); lifetime.ApplicationStarted.Register(() => { RegisterService(app, DisvoveryOptions, consulClient); }); lifetime.ApplicationStopped.Register(() => { DeRegisterService(app, DisvoveryOptions, consulClient); }); UserContextSeed.SeedAsync(app, LoggerFactory).Wait(); //InitUserDataBase(app);//初始化数据库脚本再创建数据库之后取消注释  } //注册服务方法 private void RegisterService(IApplicationBuilder app, IOptions<ServiceDisvoveryOptions> serviceOptions, IConsulClient consul) { //从当前启动的url中拿到url var features = app.Properties["server.Features"] as FeatureCollection; var addresses = features.Get<IServerAddressesFeature>() .Addresses .Select(p => new Uri(p)); foreach (var address in addresses) { var serviceId = $"{serviceOptions.Value.ServiceName}_{address.Host}:{address.Port}"; var httpCheck = new AgentServiceCheck() { DeregisterCriticalServiceAfter = TimeSpan.FromMinutes(1), Interval = TimeSpan.FromSeconds(30), HTTP = new Uri(address, "HealthCheck").OriginalString }; var registration = new AgentServiceRegistration() { Checks = new[] { httpCheck }, Address = address.Host, ID = serviceId, Name = serviceOptions.Value.ServiceName, Port = address.Port }; consul.Agent.ServiceRegister(registration).GetAwaiter().GetResult(); } } //移除方法 private void DeRegisterService(IApplicationBuilder app, IOptions<ServiceDisvoveryOptions> serviceOptions, IConsulClient consul) { //从当前启动的url中拿到url var features = app.Properties["server.Features"] as FeatureCollection; var addresses = features.Get<IServerAddressesFeature>() .Addresses .Select(p => new Uri(p)); foreach (var address in addresses) { var serviceId = $"{serviceOptions.Value.ServiceName}_{address.Host}:{address.Port}"; consul.Agent.ServiceDeregister(serviceId).GetAwaiter().GetResult(); } }  }

服务的发现

添加配置文件（这里关键是ServiceName要对上）

{
...
  "ServiceDiscovery": {
    "ServiceName": "DataService",
    "Consul": {
      "HttpEndpoint": "http://127.0.0.1:8500",
      "DnsEndpoint": {
        "Address": "127.0.0.1",
        "Port": 8600
      }
    }
  }
}

public class ServiceDisvoveryOptions
{
    public string ServiceName { get; set; }

    public ConsulOptions Consul { get; set; }
}

public class ConsulOptions
{
    public string HttpEndpoint { get; set; }

    public DnsEndpoint DnsEndpoint { get; set; }
}

public class DnsEndpoint
{
    public string Address { get; set; }

    public int Port { get; set; }

    public IPEndPoint ToIPEndPoint()
    {
        return new IPEndPoint(IPAddress.Parse(Address), Port);
    }
}

引用dnsClient nuget包并在ConfigureServices方法中注入相应的实例

         //从配置文件中获取ServiceDiscovery
            services.Configure<ServiceDisvoveryOptions>(Configuration.GetSection("ServiceDiscovery"));

            services.AddSingleton<IDnsQuery>(p =>
            {
                var serviceConfig = p.GetRequiredService<IOptions<ServiceDisvoveryOptions>>().Value;//从配置文件中获取consul相关配置信息
                return new LookupClient(serviceConfig.Consul.DnsEndpoint.ToIPEndPoint());
            });

根据配置文件信息去consul中获取相应的地址

  private readonly string userServiceUrl = "http://localhost:60907/";

        public UserService( IOptions<ServiceDisvoveryOptions> option,IDnsQuery dnsQuery)
        {
var addrs = dnsQuery.ResolveService("service.consul", option.Value.ServiceName);
            var addressList = addrs.First().AddressList;
            var host = addressList.Any() ? addressList.First().ToString() : addrs.First().HostName;
            var port = addrs.First().Port;
            userServiceUrl = $"http://{host}:{port}";
        }

参考自大佬文章 http://michaco.net/blog/ServiceDiscoveryAndHealthChecksInAspNetCoreWithConsul?tag=Consul

ocelot集成consul服务发现

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