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
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();