.NET使用YARP通过编码方式配置域名转发实现反向代理


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!

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