Ocelot与路由共存

引言

在Asp.Net Core中使用了Ocelot做网关之后，其自身的Api路由就不起作用了，寻了许久的解决方法，终于找到一个，主要是使用MapWhen判断Ocelot的配置是否符合，是则走转发路由，否则走自身路由，步骤如下：

1.先创建以下类

using Ocelot.Configuration.Repository; using Ocelot.DownstreamRouteFinder.Finder; using Ocelot.Middleware;  namespace GateWay.Extensions {     public static class OcelotExtensions     {         public static IApplicationBuilder UseOcelotWhenRouteMatch(this IApplicationBuilder app)             => UseOcelotWhenRouteMatch(app, new OcelotPipelineConfiguration());          public static IApplicationBuilder UseOcelotWhenRouteMatch(this IApplicationBuilder app,             Action<OcelotPipelineConfiguration> pipelineConfigurationAction)         {             var pipelineConfiguration = new OcelotPipelineConfiguration();             pipelineConfigurationAction?.Invoke(pipelineConfiguration);             return UseOcelotWhenRouteMatch(app, pipelineConfiguration);         }          public static IApplicationBuilder UseOcelotWhenRouteMatch(this IApplicationBuilder app, OcelotPipelineConfiguration configuration)         {             app.MapWhen(context =>             {                 // 获取 OcelotConfiguration                 var internalConfigurationResponse =                     context.RequestServices.GetRequiredService<IInternalConfigurationRepository>().Get();                 if (internalConfigurationResponse.IsError || internalConfigurationResponse.Data.Routes.Count == 0)                 {                     // 如果没有配置路由信息，不符合分支路由的条件，直接退出                     return false;                 }                  var internalConfiguration = internalConfigurationResponse.Data;                 var downstreamRouteFinder = context.RequestServices                     .GetRequiredService<IDownstreamRouteProviderFactory>()                     .Get(internalConfiguration);                  // 根据请求以及上面获取的Ocelot配置获取下游路由                 var response = downstreamRouteFinder.Get(context.Request.Path, context.Request.QueryString.ToString(),                     context.Request.Method, internalConfiguration, context.Request.Host.ToString());                  // 如果有匹配路由则满足该分支路由的条件，交给 Ocelot 处理                 return !response.IsError                        && !string.IsNullOrEmpty(response.Data?.Route?.DownstreamRoute?.FirstOrDefault()                            ?.DownstreamScheme);             }, appBuilder => appBuilder.UseOcelot(configuration).Wait());             return app;         }     } }  

2.在Program.cs调用

app.UseOcelotWhenRouteMatch(); // 此处调用 app.UseRouting(); app.UseHttpsRedirection(); app.UseAuthentication(); app.UseAuthorization();