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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請(qǐng)求速率限制。以下是一個(gè)簡(jiǎn)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請(qǐng)求速率限制:
dotnet add package Microsoft.AspNetCore.Http
dotnet add package Microsoft.Extensions.Caching.Memory
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Caching.Memory;
public class RateLimiterMiddleware
{
private readonly RequestDelegate _next;
private readonly IMemoryCache _cache;
private readonly int _maxRequests;
private readonly TimeSpan _timeWindow;
public RateLimiterMiddleware(RequestDelegate next, IMemoryCache cache, int maxRequests, TimeSpan timeWindow)
{
_next = next;
_cache = cache;
_maxRequests = maxRequests;
_timeWindow = timeWindow;
}
public async Task Invoke(HttpContext context)
{
var clientId = context.Connection.RemoteIpAddress.ToString();
var requestCount = 0;
if (_cache.TryGetValue(clientId, out int cachedRequestCount))
{
requestCount = cachedRequestCount;
}
if (requestCount >= _maxRequests)
{
context.Response.StatusCode = 429; // Too Many Requests
await context.Response.WriteAsync("Too many requests.");
return;
}
requestCount++;
_cache.Set(clientId, requestCount, _timeWindow);
await _next.Invoke(context);
}
}
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddMemoryCache();
services.AddControllers();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthorization();
app.UseMiddleware<RateLimiterMiddleware>(5, TimeSpan.FromMinutes(1)); // 5 requests per minute
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
}
在這個(gè)示例中,我們創(chuàng)建了一個(gè)名為RateLimiterMiddleware的中間件,它接收最大請(qǐng)求數(shù)和時(shí)間窗口作為參數(shù)。然后,我們將中間件添加到請(qǐng)求管道中,并設(shè)置每分鐘允許的最大請(qǐng)求數(shù)。當(dāng)客戶端超過速率限制時(shí),中間件將返回HTTP 429狀態(tài)碼(太多請(qǐng)求)。
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