Asp.NET Core 限流控制(AspNetCoreRateLimit)的实现

时间:2021-05-28

起因:

近期项目中,提供了一些调用频率较高的api接口,需要保障服务器的稳定运行;需要对提供的接口进行限流控制。避免因客户端频繁的请求导致服务器的压力。

一、AspNetCoreRateLimit 介绍

AspNetCoreRateLimit 是一个ASP.NET Core速率限制的解决方案,旨在控制客户端根据IP地址或客户端ID向Web API或MVC应用发出的请求的速率。AspNetCoreRateLimit包含一个 IpRateLimitMiddlewareClientRateLimitMiddleware ,每个中间件可以根据不同的场景配置限制允许IP或客户端,自定义这些限制策略,也可以将限制策略应用在每​​个API URL或具体的HTTP Method上。

二、AspNetCoreRateLimit使用

由上面介绍可知AspNetCoreRateLimit支持了两种方式:基于 客户端IP( IpRateLimitMiddleware)和客户端ID(ClientRateLimitMiddleware )速率限制 接下来就分别说明使用方式

添加Nuget包引用:

Install-Package AspNetCoreRateLimit

基于客户端IP速率限制

1、修改Startup.cs中方法:

public class Startup{ public Startup(IConfiguration configuration) { Configuration = configuration; } public IConfiguration Configuration { get; }// This method gets called by the runtime. Use this method to add services to the container. public void ConfigureServices(IServiceCollection services) { //需要从加载配置文件appsettings.json services.AddOptions(); //需要存储速率限制计算器和ip规则 services.AddMemoryCache(); //从appsettings.json中加载常规配置,IpRateLimiting与配置文件中节点对应 services.Configure<IpRateLimitOptions>(Configuration.GetSection("IpRateLimiting")); //从appsettings.json中加载Ip规则 services.Configure<IpRateLimitPolicies>(Configuration.GetSection("IpRateLimitPolicies")); //注入计数器和规则存储 services.AddSingleton<IIpPolicyStore, MemoryCacheIpPolicyStore>(); services.AddSingleton<IRateLimitCounterStore, MemoryCacheRateLimitCounterStore>(); services.AddControllers(); services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); //配置(解析器、计数器密钥生成器) services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>(); //Other Code } // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { //Other Code app.UseRouting(); app.UseAuthorization();     //启用客户端IP限制速率 app.UseIpRateLimiting(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); }}

2、在appsettings.json中添加通用配置项节点:(IpRateLimiting节点与Startup中取的节点对应)

"IpRateLimiting": { //false,则全局将应用限制,并且仅应用具有作为端点的规则*。例如,如果您设置每秒5次调用的限制,则对任何端点的任何HTTP调用都将计入该限制 //true, 则限制将应用于每个端点,如{HTTP_Verb}{PATH}。例如,如果您为*:/api/values客户端设置每秒5个呼叫的限制, "EnableEndpointRateLimiting": false, //false,拒绝的API调用不会添加到调用次数计数器上;如 客户端每秒发出3个请求并且您设置了每秒一个调用的限制,则每分钟或每天计数器等其他限制将仅记录第一个调用,即成功的API调用。如果您希望被拒绝的API调用计入其他时间的显示(分钟,小时等) //,则必须设置StackBlockedRequests为true。 "StackBlockedRequests": false, //Kestrel 服务器背后是一个反向代理,如果你的代理服务器使用不同的页眉然后提取客户端IP X-Real-IP使用此选项来设置 "RealIpHeader": "X-Real-IP", //取白名单的客户端ID。如果此标头中存在客户端ID并且与ClientWhitelist中指定的值匹配,则不应用速率限制。 "ClientIdHeader": "X-ClientId", //限制状态码 "HttpStatusCode": 429, ////IP白名单:支持Ip v4和v6 //"IpWhitelist": [ "127.0.0.1", "::1/10", "192.168.0.0/24" ], ////端点白名单 //"EndpointWhitelist": [ "get:/api/license", "*:/api/status" ], ////客户端白名单 //"ClientWhitelist": [ "dev-id-1", "dev-id-2" ], //通用规则 "GeneralRules": [ { //端点路径 "Endpoint": "*", //时间段,格式:{数字}{单位};可使用单位:s, m, h, d "Period": "1s", //限制 "Limit": 2 },   //15分钟只能调用100次 {"Endpoint": "*","Period": "15m","Limit": 100},   //12H只能调用1000 {"Endpoint": "*","Period": "12h","Limit": 1000},   //7天只能调用10000次 {"Endpoint": "*","Period": "7d","Limit": 10000} ]}

配置节点已添加相应注释信息。

规则设置格式:

端点格式: {HTTP_Verb}:{PATH} ,您可以使用asterix符号来定位任何HTTP谓词。

期间格式: {INT}{PERIOD_TYPE} ,您可以使用以下期间类型之一: s, m, h, d 。

限制格式: {LONG}

3、特点Ip限制规则设置,在appsettings.json中添加 IP规则配置节点

"IpRateLimitPolicies": { //ip规则 "IpRules": [ { //IP "Ip": "84.247.85.224", //规则内容 "Rules": [ //1s请求10次 {"Endpoint": "*","Period": "1s","Limit": 10}, //15分钟请求200次 {"Endpoint": "*","Period": "15m","Limit": 200} ] }, { //ip支持设置多个 "Ip": "192.168.3.22/25", "Rules": [ //1秒请求5次 {"Endpoint": "*","Period": "1s","Limit": 5}, //15分钟请求150次 {"Endpoint": "*","Period": "15m","Limit": 150}, //12小时请求500次 {"Endpoint": "*","Period": "12h","Limit": 500} ] } ]}

基于客户端ID速率限制

1、修改Startup文件:

public void ConfigureServices(IServiceCollection services){ //需要从加载配置文件appsettings.json services.AddOptions(); //需要存储速率限制计算器和ip规则 services.AddMemoryCache(); //从appsettings.json中加载常规配置 services.Configure<ClientRateLimitOptions>(Configuration.GetSection("IPRateLimiting")); //从appsettings.json中加载客户端规则 services.Configure<ClientRateLimitPolicies>(Configuration.GetSection("ClientRateLimitPolicies")); //注入计数器和规则存储 services.AddSingleton<IClientPolicyStore, MemoryCacheClientPolicyStore>(); services.AddSingleton<IRateLimitCounterStore, MemoryCacheRateLimitCounterStore>(); services.AddControllers(); // https://github.com/aspnet/Hosting/issues/793 // the IHttpContextAccessor service is not registered by default. //注入计数器和规则存储 services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); //配置(解析器、计数器密钥生成器) services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>();}public void Configure(IApplicationBuilder app, IHostingEnvironment env){ //启用客户端限制 app.UseClientRateLimiting(); app.UseMvc();}

2、通用配置采用IP限制相同配置,添加客户端限制配置:

//客户端限制设置"ClientRateLimitPolicies": { "ClientRules": [ { //客户端id "ClientId": "client-id-1", "Rules": [ {"Endpoint": "*","Period": "1s","Limit": 10}, {"Endpoint": "*","Period": "15m","Limit": 200} ] }, { "ClientId": "client-id-2", "Rules": [ {"Endpoint": "*","Period": "1s","Limit": 5}, {"Endpoint": "*","Period": "15m","Limit": 150}, {"Endpoint": "*","Period": "12h","Limit": 500} ] } ]}

3、调用结果:

设置规则:1s只能调用一次:首次调用

调用第二次:自定义返回内容

三、其他

运行时更新速率限制

添加 IpRateLimitController控制器:

/// <summary>/// IP限制控制器/// </summary>[Route("api/[controller]")][ApiController]public class IpRateLimitController : ControllerBase{ private readonly IpRateLimitOptions _options; private readonly IIpPolicyStore _ipPolicyStore; /// <summary> /// /// </summary> /// <param name="optionsAccessor"></param> /// <param name="ipPolicyStore"></param> public IpRateLimitController(IOptions<IpRateLimitOptions> optionsAccessor, IIpPolicyStore ipPolicyStore) { _options = optionsAccessor.Value; _ipPolicyStore = ipPolicyStore; } /// <summary> /// 获取限制规则 /// </summary> /// <returns></returns> [HttpGet] public async Task<IpRateLimitPolicies> Get() { return await _ipPolicyStore.GetAsync(_options.IpPolicyPrefix); } /// <summary> /// /// </summary> [HttpPost] public async Task Post(IpRateLimitPolicy ipRate) { var pol = await _ipPolicyStore.GetAsync(_options.IpPolicyPrefix); if (ipRate != null) { pol.IpRules.Add(ipRate); await _ipPolicyStore.SetAsync(_options.IpPolicyPrefix, pol); } }}

分布式部署时,需要将速率限制计算器和ip规则存储到分布式缓存中如Redis

修改注入对象

// inject counter and rules distributed cache storesservices.AddSingleton<IClientPolicyStore, DistributedCacheClientPolicyStore>();services.AddSingleton<IRateLimitCounterStore,DistributedCacheRateLimitCounterStore>();

添加Nuget包 Microsoft.Extensions.Caching.StackExchangeRedis

在Startup中设置Redis连接

services.AddStackExchangeRedisCache(options =>{ options.ConfigurationOptions = new ConfigurationOptions { //silently retry in the background if the Redis connection is temporarily down AbortOnConnectFail = false }; options.Configuration = "localhost:6379"; options.InstanceName = "AspNetRateLimit";});

限制时自定义相应结果:

//请求返回 "QuotaExceededResponse": { "Content": "{{\"code\":429,\"msg\":\"Visit too frequently, please try again later\",\"data\":null}}", "ContentType": "application/json;utf-8", "StatusCode": 429 },

调用时返回结果:

其他:

示例代码:https://github.com/cwsheng/WebAPIVersionDemo

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