.NET 反向代理 YARP 通过编码方式配置域名转发

　　前面介绍了 YARP 通过配置文件的方式配置代理转发（传送门），而众所周知，微软的一贯作风就是能通过配置文件做的事情，通过编码的方式也能实现！YARP 也不例外，废话不多说，直接上代码！

　　首先，参照官方文档，我们先新建一个 InMemoryConfigProvider 类，并且继承 IProxyConfigProvider 接口，类里面还包含了一个  IProxyConfig 的类，别看漏了噢！

　　这里多嘴一下，下面的代码出现了 volatile 关键字，介绍一下它：volatile 是 C# 中用于控制同步的关键字，其意义是针对程序中一些敏感数据，不允许多线程同时访问，保证数据在任何访问时刻，最多有一个线程访问，以保证数据的完整性，volatile 是修饰变量的修饰符。

public class InMemoryConfigProvider : IProxyConfigProvider {     private volatile InMemoryConfig _config;      public InMemoryConfigProvider(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)     {         _config = new InMemoryConfig(routes, clusters);     }      public IProxyConfig GetConfig() => _config;      public void Update(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)     {         var oldConfig = _config;         _config = new InMemoryConfig(routes, clusters);         oldConfig.SignalChange();     }      private class InMemoryConfig : IProxyConfig     {         private readonly CancellationTokenSource _cts = new();          public InMemoryConfig(IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)         {             Routes = routes;             Clusters = clusters;             ChangeToken = new CancellationChangeToken(_cts.Token);         }          public IReadOnlyList<RouteConfig> Routes { get; }          public IReadOnlyList<ClusterConfig> Clusters { get; }          public IChangeToken ChangeToken { get; }          internal void SignalChange()         {             _cts.Cancel();         }     } }

 

　　然后添加一个扩展 InMemoryConfigProviderExtensions

public static class InMemoryConfigProviderExtensions {     public static IReverseProxyBuilder LoadFromMemory(this IReverseProxyBuilder builder, IReadOnlyList<RouteConfig> routes, IReadOnlyList<ClusterConfig> clusters)     {         builder.Services.AddSingleton<IProxyConfigProvider>(new InMemoryConfigProvider(routes, clusters));         return builder;     } }

 

　　接下来就是写配置了，我个人还是喜欢在配置文件中写，但是有动态配置需求的话，又不想登录服务器编辑 appsetting 文件，通过编码的方式确实更为方便，将配置写进库或者其它存储方式里面，那将是随心所欲啊！上代码:

Program.cs

var routes = new[] {     new RouteConfig()     {         RouteId = "admin",         ClusterId = "admin",         Match = new RouteMatch         {             Hosts = new string[] {"test1.ysmc.net.cn" },             Path = "{**catch-all}"         }     },      new RouteConfig()     {         RouteId = "blazor",         ClusterId = "blazor",         Match = new RouteMatch         {             Hosts = new string[] {"test2.ysmc.net.cn" },             Path = "{**catch-all}"         }     } };  var clusters = new[] {     new ClusterConfig()     {         ClusterId = "admin",         LoadBalancingPolicy = "RoundRobin",         Destinations = new Dictionary<string, DestinationConfig>(StringComparer.OrdinalIgnoreCase)         {             { "admin", new DestinationConfig() { Address = "https://admin.blazor.zone" } }         }     },      new ClusterConfig()     {         ClusterId = "blazor",         LoadBalancingPolicy = "RoundRobin",         Destinations = new Dictionary<string, DestinationConfig>(StringComparer.OrdinalIgnoreCase)         {             { "blazor", new DestinationConfig() { Address = "https://www.blazor.zone" } }         }     } };  builder.Services.AddReverseProxy().LoadFromMemory(routes, clusters);

　　上面的配置代码，跟配置文件方式的节点和属性，都是对应的，照着写就是了

"ReverseProxy": {   "Routes": {     "admin": {       "ClusterId": "admin",       "Match": {         "Hosts": [ "test1.ysmc.net.cn" ],         "Path": "{**catch-all}"       }     },     "blazor": {       "ClusterId": "blazor",       "Match": {         "Hosts": [ "test2.ysmc.net.cn" ],         "Path": "{**catch-all}"       }     }   },   "Clusters": {     "admin": {       "LoadBalancingPolicy": "RoundRobin",       "Destinations": {         "admin": {           "Address": "https://admin.blazor.zone/"         }       }     },     "blazor": {       "LoadBalancingPolicy": "RoundRobin",       "Destinations": {         "blazor": {           "Address": "https://www.blazor.zone/"         }       }     }   } }

 

　　最终效果还是依旧的完美，感谢大佬的观看，谢谢！

 原文链接：https://www.cnblogs.com/ysmc/p/16724763.html