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在C#中,我們可以使用ASP.NET Core的中間件來實(shí)現(xiàn)API限流。這里是一個(gè)簡單的示例,展示了如何創(chuàng)建一個(gè)自定義中間件來管理API限流規(guī)則:
首先,安裝以下NuGet包:
創(chuàng)建一個(gè)名為RateLimitingOptions
的類,用于存儲(chǔ)限流選項(xiàng):
public class RateLimitingOptions
{
public int MaxRequestsPerMinute { get; set; } = 60;
}
RateLimiterMiddleware
的類,實(shí)現(xiàn)自定義中間件:using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
public class RateLimiterMiddleware
{
private readonly RequestDelegate _next;
private readonly RateLimitingOptions _options;
public RateLimiterMiddleware(RequestDelegate next, IOptions<RateLimitingOptions> options)
{
_next = next;
_options = options.Value;
}
public async Task Invoke(HttpContext context)
{
var clientId = context.Connection.RemoteIpAddress.ToString();
var rateLimitKey = $"RateLimit:{clientId}";
// 獲取當(dāng)前請求計(jì)數(shù)
var currentRequestCount = context.Items.ContainsKey(rateLimitKey) ? (int)context.Items[rateLimitKey] : 0;
if (currentRequestCount >= _options.MaxRequestsPerMinute)
{
// 超過限制,返回429狀態(tài)碼
context.Response.StatusCode = 429;
await context.Response.WriteAsync("Too Many Requests");
return;
}
// 更新請求計(jì)數(shù)
context.Items[rateLimitKey] = currentRequestCount + 1;
// 調(diào)用下一個(gè)中間件
await _next.Invoke(context);
}
}
Startup.cs
中注冊中間件:using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
services.Configure<RateLimitingOptions>(Configuration.GetSection("RateLimiting"));
services.AddControllers();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseMiddleware<RateLimiterMiddleware>();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
appsettings.json
中配置限流選項(xiàng):{
"RateLimiting": {
"MaxRequestsPerMinute": 10
}
}
現(xiàn)在,你已經(jīng)創(chuàng)建了一個(gè)自定義中間件來管理API限流規(guī)則。你可以根據(jù)需要調(diào)整限流選項(xiàng),例如限制每分鐘的請求數(shù)或者為不同的客戶端設(shè)置不同的限制。
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