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Ocelot 结成 Consul 做配置以及服务发现出现的一些小问题

发布时间 2023-04-09 23:41:53作者: 秦晓

首先创建 web 项目

dotnet new web -n ApiGateway

然后安装对应的 nuget 包

dotnet add package Ocelot
dotnet add package Ocelot.Provider.Consul

Program 配置

using Ocelot.Middleware;
using Ocelot.DependencyInjection;
using Ocelot.Provider.Consul;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddOcelot().AddConsul().AddConfigStoredInConsul();

builder.Configuration.AddJsonFile("ocelot.json");

var app = builder.Build();

app.UseOcelot().Wait();

app.Run();

然后配置 ocelot.json

{
  "Routes": [
    {
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "UseServiceDiscovery": true,
      "UpstreamPathTemplate": "/media-service/{url}",
      "ServiceName": "MediaService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      }
    },
    {
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "UseServiceDiscovery": true,
      "UpstreamPathTemplate": "/dictionary-service/{url}",
      "ServiceName": "DictionaryService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      }
    },
    {
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "UseServiceDiscovery": true,
      "UpstreamPathTemplate": "/search-service/{url}",
      "ServiceName": "SearchService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      }
    },
    {
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "UseServiceDiscovery": true,
      "UpstreamPathTemplate": "/user-service/{url}",
      "ServiceName": "UserService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      }
    },
    {
      "DownstreamPathTemplate": "/{url}",
      "DownstreamScheme": "http",
      "UseServiceDiscovery": true,
      "UpstreamPathTemplate": "/content-service/{url}",
      "ServiceName": "ContentService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      },
      "RouteIsCaseSensitive": false
    }
  ],
  "GlobalConfiguration": {
    "ServiceDiscoveryProvider": {
      "Host": "localhost",
      "Port": 8500,
      "PollingInterval": 5000,
      "Type": "Consul",
      "ConfigurationKey": "API_Gateway"
    }
  }
}

没有找到注册的服务

因为是获取对应的服务实例时，请求的路径不对，例如我在 consul 中注册了 ContentService，在 ocelot.json 中也配置了 ServiceName 为 ContentService，LoadBalancer 会尝试获取所有可用的实例，
通过向 consul 的 /v1/health/service/content-service 路径，然而这个路径时错误的，所以并不能收到相关的信息

解决方法（Ocelot.Provider.Consul 已经是 归档状态了）：服务名不要使用 PascalCase，使用中划线分割单词

服务地址无效

consul 注册的使用服务 Address 应该时 Host 名称，不能是 localhost，也不能带有协议名称 https:// 或者 https:// 等