.NET 反向代理 YARP 通过编码方式配置域名转发

屁股侠 發表於 2022-9-24 00:40:00

.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。
<div class="cnblogs_code">
<pre>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();
 }
}
}</pre>
</div>
 
　　然后添加一个扩展 InMemoryConfigProviderExtensions
<div class="cnblogs_code">
<pre>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;
}
}</pre>
</div>
 
　　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
<div class="cnblogs_code">
<pre>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);</pre>
</div>
　　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
<div class="cnblogs_code">
<pre>"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/"
 }
 }
}
}
}</pre>
</div>
 
　　最终效果还是依旧的完美，感谢大佬的观看，谢谢！
<img src="https://img2022.cnblogs.com/blog/1897432/202209/1897432-20220924002841803-913899467.png" alt="" loading="lazy" style="display: block; margin-left: auto; margin-right: auto">
 原文链接：https://www.cnblogs.com/ysmc/p/16724763.html

</div>
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本文来自博客园，作者：一事冇诚，转载请注明原文链接：https://www.cnblogs.com/ysmc/p/16724763.html 
来源：https://www.cnblogs.com/ysmc/p/16724763.html

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.NET 反向代理 YARP 通过编码方式配置域名转发