简介

  api网关是提供给外部调用的统一入口,类似于dns,所有的请求统一先到api网关,由api网关进行指定内网链接。

  ocelot是基于netcore开发的开源API网关项目,功能强大,使用方便,它包含了负载均衡、路由、请求聚合、服务发现、权限认证等功能。

基础准备

  开发环境:vs2017

  netcore:2.1

新建项目

  

 

 

netcore安装ocelot

* install-package Ocelot  安装ocelot组件
配置ocelot

 1.添加ocelotSettings.json文件,并且在program.cs文件当中添加配置信息

 
using System; using System.Collections.Generic; using System.IO; using
System.Linq;using System.Threading.Tasks; using Microsoft.AspNetCore; using
Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.Configuration; using
Microsoft.Extensions.Logging;namespace ocelotTest { public class Program {
public static void Main(string[] args) { BuildWebHost(args).Run(); } public
static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args) .UseStartup<Startup>() .UseUrls("
http://localhost:8683") .ConfigureAppConfiguration(conf => { conf.AddJsonFile("
OcelotSettings.json", optional: false, reloadOnChange: true); }) .Build(); } }
2.注入ocelot服务
using System; using System.Collections.Generic; using System.Linq; using
System.Threading.Tasks;using Microsoft.AspNetCore.Builder; using
Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Mvc; using
Microsoft.Extensions.Configuration;using
Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options; using Ocelot.DependencyInjection; using
Ocelot.Middleware;using Ocelot.Provider.Consul; using Ocelot.Provider.Polly;
namespace ocelotTest { 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) {//注入ocelot服务
services.AddOcelot(Configuration).AddConsul().AddPolly(); }// This method gets
called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env) { if
(env.IsDevelopment()) { app.UseDeveloperExceptionPage(); }
app.UseOcelot().Wait(); } } }
3.配置ocelotSettings.json
{ "ReRoutes": [ { //下游路由模板,真实请求的路径 "DownstreamPathTemplate": "/api/{everything}
", //请求的方式,例如:http,https "DownstreamScheme": "http", //服务器名称 "ServiceName": "zyz
", //启用consul服务 "UseServiceDiscovery": true, //服务熔断 "QoSOptions": { "
ExceptionsAllowedBeforeBreaking": 3, //允许多少次异常请求 "DurationOfBreak": 5, //
熔断时间,单位为秒 "TimeoutValue": 5000 //如果下游请求的处理时间超过多少则自动设置超时 }, "HttpHandlerOptions"
: {"AllowAutoRedirect": false, "UseCookieContainer": false, "UseTracing": false
},"ReRouteIsCaseSensitive": false, //负载均衡: //RoundRobin轮流发送; //LeastConnection
– 将请求发往最空闲的那个服务器//NoLoadBalance – 总是发往第一个请求或者是服务发现 "LoadBalancerOptions": { "
Type": "RoundRobin" }, //上游地址配置 "UpstreamPathTemplate": "/test/{everything}", //
上游支持的请求类型 "UpstreamHttpMethod": [ "Post", "Get" ] } ], "GlobalConfiguration": {
"BaseUrl": "https://localhost:8683", //consul服务器地址和ip "ServiceDiscoveryProvider"
: {"Host": "localhost", "Port": 8500 } } }
4.启动ocelot项目和consul服务。

把服务注册到consul当中,通过postman发送请求测试,成功转发消息,并且实现负载均衡。



 



 

小结:简单的ocelot搭建完成,后续的一些扩展功能慢慢在研究。

 

快速入口:微服务(入门一):netcore安装部署consul
<https://www.cnblogs.com/zhengyazhao/p/10749620.html>

快速入口: 微服务(入门二):netcore通过consul注册服务
<https://www.cnblogs.com/zhengyazhao/p/10749620.html>

快速入口: 微服务(入门三):netcore ocelot api网关结合consul服务发现
<https://www.cnblogs.com/zhengyazhao/p/10757636.html>

快速入口:微服务(入门四):identityServer的简单使用(客户端授权)
<https://www.cnblogs.com/zhengyazhao/p/10769723.html> 

 

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