■ PollyHttpClientBuilderExtensions 클래스의 AddPolicyHandler 확장 메소드를 사용해 동적으로 정책을 선택하는 방법을 보여준다.
▶ Startup.cs
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using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using System; using System.Net.Http; using Polly; using Polly.Timeout; namespace TestProject { /// <summary> /// 시작 /// </summary> public class Startup { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 구성 - Configuration /// <summary> /// 구성 /// </summary> public IConfiguration Configuration { get; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - Startup(configuration) /// <summary> /// 생성자 /// </summary> /// <param name="configuration">구성</param> public Startup(IConfiguration configuration) { Configuration = configuration; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 서비스 컬렉션 구성하기 - ConfigureServices(services) /// <summary> /// 서비스 컬렉션 구성하기 /// </summary> /// <param name="services">서비스 컬렉션</param> public void ConfigureServices(IServiceCollection services) { AsyncTimeoutPolicy<HttpResponseMessage> regularTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage> ( TimeSpan.FromSeconds(10) ); AsyncTimeoutPolicy<HttpResponseMessage> longTimeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage> ( TimeSpan.FromSeconds(30) ); services.AddHttpClient("test") .AddPolicyHandler ( request => request.Method == HttpMethod.Get ? regularTimeoutPolicy : longTimeoutPolicy ); services.AddControllers(); services.AddRazorPages(); } #endregion #region 구성하기 - Configure(app, environment) /// <summary> /// 구성하기 /// </summary> /// <param name="app">애플리케이션 빌더</param> /// <param name="environment">웹 호스트 환경</param> public void Configure(IApplicationBuilder app, IWebHostEnvironment environment) { if(environment.IsDevelopment()) { app.UseDeveloperExceptionPage(); } else { app.UseExceptionHandler("/Error"); } app.UseRouting(); app.UseEndpoints ( endpoints => { endpoints.MapControllerRoute ( name : "default", pattern : "{controller=Home}/{action=Index}/{id?}" ); endpoints.MapRazorPages(); } ); } #endregion } } |
※ 설치 패키지 : Microsoft.Extensions.Http.Polly