/// <summary>
/// Adds a set of rety and circuit breaker policies to the given policy registery with the given service name.
/// </summary>
/// <typeparam name="TService">The service for which the policies are being setup.</typeparam>
/// <param name="services">The <see cref="IServiceCollection"/> to add the feature's services to.</param>
/// <param name="config">The <see cref="IConfiguration"/> that defines Polly policy settings.</param>
/// <param name="policyRegistry">The <see cref="IPolicyRegistry{TKey}"/> to add the new policies to.</param>
/// <returns>A reference to this instance after the operation has completed.</returns>
public static IServiceCollection AddPolicies <TService>(
this IServiceCollection services,
IConfiguration config,
IPolicyRegistry <string> policyRegistry)
{
var policyOptions = new HttpPolicyOptions();
config.GetSection(nameof(HttpPolicyOptions)).Bind(policyOptions);
policyRegistry?.Add(
$"{typeof(TService).Name}_{PolicyType.Retry}",
HttpPolicyExtensions
.HandleTransientHttpError()
.WaitAndRetryAsync(
policyOptions.HttpRetryCount,
retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetryBackoffPower, retryAttempt))));
policyRegistry?.Add(
$"{typeof(TService).Name}_{PolicyType.CircuitBreaker}",
HttpPolicyExtensions
.HandleTransientHttpError()
.CircuitBreakerAsync(
handledEventsAllowedBeforeBreaking: policyOptions.CircuitBreakerToleranceCount,
durationOfBreak: policyOptions.CircuitBreakerDurationOfBreak));
return(services);
}
private static IServiceCollection ConfigurePolicies(this IServiceCollection services)
{
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httpWaitAndpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt =>
TimeSpan.FromSeconds(Math.Pow(2, retryAttempt) / 2), onRetry: (httpResponseMessage, retryCount) =>
{
// Log
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine($"Request failed...{httpResponseMessage.Result.StatusCode}");
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine($"Retrying...");
Console.ForegroundColor = ConsoleColor.White;
});
registry.Add(nameof(httpWaitAndpRetryPolicy), httpWaitAndpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add(nameof(noOpPolicy), noOpPolicy);
return(services);
}
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> _httpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.Or <TimeoutRejectedException>()
.RetryAsync(3);
registry.Add("SimpleHttpRetryPolicy", _httpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> httpWaitAndRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(retryAttempt));
registry.Add("SimpleWaitAndRetryPolicy", httpWaitAndRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync().AsAsyncPolicy <HttpResponseMessage>();
registry.Add("NoOpPolicy", noOpPolicy);
services.AddHttpClient(PollyConstants.RemoteServer, client =>
{
client.BaseAddress = new Uri("http://localhost:58042/api/");
client.DefaultRequestHeaders.Add("Accept", "application/json");
}).AddPolicyHandlerFromRegistry(PolicySelector);
}
public static IServiceCollection AddPolicies(
this IServiceCollection services,
IPolicyRegistry <string> policyRegistry,
string keyPrefix,
PolicyOptions policyOptions)
{
if (policyOptions != null)
{
policyRegistry?.Add(
$"{keyPrefix}_{nameof(PolicyOptions.HttpRetry)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.WaitAndRetryAsync(
policyOptions.HttpRetry.Count,
retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt))));
policyRegistry?.Add(
$"{keyPrefix}_{nameof(PolicyOptions.HttpCircuitBreaker)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.CircuitBreakerAsync(
handledEventsAllowedBeforeBreaking: policyOptions.HttpCircuitBreaker.ExceptionsAllowedBeforeBreaking,
durationOfBreak: policyOptions.HttpCircuitBreaker.DurationOfBreak));
return(services);
}
throw new InvalidOperationException($"{nameof(policyOptions)} is null");
}
public static IPolicyRegistry <string> AddStandardPolicies(
this IPolicyRegistry <string> policyRegistry,
string keyPrefix,
CorePolicyOptions policyOptions)
{
if (policyOptions == null)
{
throw new ArgumentException("policyOptions cannot be null", nameof(policyOptions));
}
if (policyRegistry == null)
{
throw new ArgumentException("policyRegistry cannot be null", nameof(policyRegistry));
}
policyRegistry.Add(
$"{keyPrefix}_{nameof(CorePolicyOptions.HttpRetry)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.WaitAndRetryAsync(
policyOptions.HttpRetry.Count,
retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt))));
policyRegistry.Add(
$"{keyPrefix}_{nameof(CorePolicyOptions.HttpCircuitBreaker)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.CircuitBreakerAsync(
handledEventsAllowedBeforeBreaking: policyOptions.HttpCircuitBreaker.ExceptionsAllowedBeforeBreaking,
durationOfBreak: policyOptions.HttpCircuitBreaker.DurationOfBreak));
return(policyRegistry);
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton(GetRegistry());
IAsyncPolicy <HttpResponseMessage> httpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.RetryAsync(3);
IAsyncPolicy <HttpResponseMessage> noPolicy =
Policy.NoOpAsync <HttpResponseMessage>();
// Polly Single Policy
//services.AddHttpClient("RemoteServer", client =>
//{
// client.BaseAddress = new Uri("https://localhost:44363/");
// client.DefaultRequestHeaders.Add("Accept", "application/json");
//}).AddPolicyHandler(httpRetryPolicy);
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
registry.Add("SimpleRetry", httpRetryPolicy);
registry.Add("NoOp", noPolicy);
services.AddHttpClient("RemoteServer", client =>
{
client.BaseAddress = new Uri("https://localhost:44363/");
client.DefaultRequestHeaders.Add("Accept", "application/json");
}).AddPolicyHandlerFromRegistry(PolicySelector);
services.AddControllers();
}
public static void AddPolicies(this IServiceCollection services)
{
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
Random jitterer = new Random();
var policyGSync = Policy.Handle <Exception>(ex => !(ex is GoogleApiException || ex is NegocioException))
.WaitAndRetryAsync(3, // exponential back-off plus some jitter
retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt))
+ TimeSpan.FromMilliseconds(jitterer.Next(0, 30)));
registry.Add(PoliticaPolly.PolicyGoogleSync, policyGSync);
var policyFilas = Policy.Handle <Exception>()
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(5));
registry.Add(PoliticaPolly.PolicyPublicaFila, policyFilas);
var policyGSyncRemocaoProfessor = Policy.Handle <Exception>()
.WaitAndRetryAsync(new[]
{
TimeSpan.FromSeconds(60),
TimeSpan.FromSeconds(60),
TimeSpan.FromSeconds(60),
TimeSpan.FromSeconds(60),
TimeSpan.FromSeconds(60)
}, (exception, timeSpan, retryCount, context) =>
{
Console.WriteLine($"RETRY policyGSyncRemocaoProfessor - {retryCount}: {exception.Message}");
});
//.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(30));
registry.Add(PoliticaPolly.PolicyRemocaoProfessor, policyGSyncRemocaoProfessor);
RegistrarPolicyGsa(registry);
}
/// <summary>
///
/// </summary>
/// <param name="services"></param>
/// <param name="configureClient"></param>
/// <returns></returns>
private static IHttpClientBuilder AddHttpClient(this IServiceCollection services, Action <HttpClient> configureClient)
{
if (services == null)
{
throw new ArgumentNullException(nameof(services));
}
if (configureClient == null)
{
throw new ArgumentNullException(nameof(configureClient));
}
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
var timeout = Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(10));
var longTimeout = Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(60));
registry.Add("regular", timeout);
registry.Add("long", longTimeout);
return(services.AddHttpClient("SFExpress", configureClient)
.AddPolicyHandler(Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(100)))
.AddPolicyHandlerFromRegistry("regular")
.AddPolicyHandler((request) =>
{
return request.Method == HttpMethod.Get ? timeout : longTimeout;
})
.AddPolicyHandlerFromRegistry((reg, request) =>
{
return request.Method == HttpMethod.Get ?
reg.Get <IAsyncPolicy <HttpResponseMessage> >("regular") :
reg.Get <IAsyncPolicy <HttpResponseMessage> >("long");
})
.AddTransientHttpErrorPolicy(p => p.RetryAsync())
.AddHttpMessageHandler(() => new RetryHandler())
.AddTypedClient <SfExpressService>());
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.RetryAsync(3);
registry.Add("SimpleHttpRetryPolicy", httpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> httWaitAndpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(retryAttempt));
registry.Add("SimpleWaitAndRetryPolicy", httWaitAndpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add("NoOpPolicy", noOpPolicy);
services.AddHttpClient("RemoteServer", client =>
{
client.BaseAddress = new Uri("http://localhost:57696/api/");
client.DefaultRequestHeaders.Add("Accept", "application/json");
}).AddPolicyHandlerFromRegistry((PolicySelector));
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
public static IServiceCollection AddPolicies(
this IServiceCollection services,
IPolicyRegistry <string> policyRegistry,
string keyPrefix,
PolicyOptions policyOptions)
{
_ = policyOptions ?? throw new ArgumentNullException(nameof(policyOptions));
policyRegistry?.Add(
$"{keyPrefix}_{nameof(PolicyOptions.HttpRetry)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.OrResult(msg => msg.StatusCode == System.Net.HttpStatusCode.TooManyRequests)
.OrResult(r => r?.Headers?.RetryAfter != null)
.WaitAndRetryAsync(
policyOptions.HttpRetry.Count,
retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt))));
policyRegistry?.Add(
$"{keyPrefix}_{nameof(PolicyOptions.HttpCircuitBreaker)}",
HttpPolicyExtensions
.HandleTransientHttpError()
.CircuitBreakerAsync(
handledEventsAllowedBeforeBreaking: policyOptions.HttpCircuitBreaker.ExceptionsAllowedBeforeBreaking,
durationOfBreak: policyOptions.HttpCircuitBreaker.DurationOfBreak));
return(services);
}
private static void AddPolicies(IPolicyRegistry <string> policyRegistry)
{
var policyOptions = new PolicyOptions()
{
HttpRetry = new RetryPolicyOptions(), HttpCircuitBreaker = new CircuitBreakerPolicyOptions()
};
policyRegistry.Add(nameof(PolicyOptions.HttpRetry), HttpPolicyExtensions.HandleTransientHttpError().WaitAndRetryAsync(policyOptions.HttpRetry.Count, retryAttempt => TimeSpan.FromSeconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt))));
policyRegistry.Add(nameof(PolicyOptions.HttpCircuitBreaker), HttpPolicyExtensions.HandleTransientHttpError().CircuitBreakerAsync(policyOptions.HttpCircuitBreaker.ExceptionsAllowedBeforeBreaking, policyOptions.HttpCircuitBreaker.DurationOfBreak));
}
public void Should_be_able_to_retrieve_stored_Policy_using_TryGet()
{
Policy policy = Policy.NoOp();
string key = Guid.NewGuid().ToString();
Policy outPolicy = null;
_registry.Add(key, policy);
ReadOnlyRegistry.TryGet(key, out outPolicy).Should().BeTrue();
outPolicy.Should().BeSameAs(policy);
}
public bool TryAdd <TPolicy>(string key, TPolicy policy) where TPolicy : ICircuitBreakerPolicy
{
var added = false;
lock (_lock)
{
if (!Registry.ContainsKey(key))
{
Registry.Add(key, policy);
added = true;
}
}
return(added);
}
static async Task Main(string[] args)
{
_config = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.Build();
var builder = new HostBuilder()
.ConfigureServices((hostContext, services) =>
{
services.Configure <LastFmSettings>(_config.GetSection("LastFmSettings"));
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httWaitAndpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(retryAttempt));
registry.Add("SimpleWaitAndRetryPolicy", httWaitAndpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add("NoOpPolicy", noOpPolicy);
services.AddHttpClient("LastFmClient", client =>
{
client.BaseAddress = new Uri(_config.GetValue <string>("LastFmSettings:BaseUrl"));
client.DefaultRequestHeaders.Add("Accept", "application/json");
}).AddPolicyHandlerFromRegistry((policyRegistry, httpRequestMessage) =>
{
if (httpRequestMessage.Method == HttpMethod.Get || httpRequestMessage.Method == HttpMethod.Delete)
{
return(policyRegistry.Get <IAsyncPolicy <HttpResponseMessage> >("SimpleWaitAndRetryPolicy"));
}
return(policyRegistry.Get <IAsyncPolicy <HttpResponseMessage> >("NoOpPolicy"));
});
services.AddAutoMapper();
services.AddSingleton <IHostedService, Run>();
services.AddSingleton <IDatabaseService, DatabaseService>();
services.AddSingleton <IExtractorService, ExtractorService>();
services.AddSingleton <IUrlBuilderService, UrlBuilderService>();
services.AddSingleton <ITransformService, TransformService>();
AddMusicContextDb(services);
});
await builder.RunConsoleAsync();
}
public static void GetPolicyRegistry(IAsyncCacheProvider cacheProvider,
IPolicyRegistry <string> registry)
{
registry.Add("thriceTriplingRetryPolicy", Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.Or <TimeoutRejectedException>()
.WaitAndRetryAsync(thriceTriplingTimeSpans));
registry.Add("loginResponseRetryPolicy", Policy.HandleResult <LoginResponse>(lr => lr.LoginStatus != _successfulLoginStatus)
.Or <TimeoutRejectedException>()
.WaitAndRetryAsync(thriceTriplingTimeSpans));
registry.Add("thirtySecondTimeoutPolicy", Policy.TimeoutAsync(TimeSpan.FromSeconds(30)));
AsyncCachePolicy <LoginResponse> cachePolicy = Policy.CacheAsync <LoginResponse>(cacheProvider, _timeToLive);
registry.Add("oneMinuteLoginCachePolicy", cachePolicy);
}
public static void AdicionarPoliticas(this IServiceCollection services)
{
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httWaitAndpRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(retryAttempt));
registry.Add("PoliticaDeRetentativa", httWaitAndpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add("SemPoliticaOp", noOpPolicy);
}
/// <summary>
/// 增加重试代码
/// </summary>
/// <param name="services"></param>
/// <param name="name"></param>
/// <param name="configureClient"></param>
/// <returns></returns>
public static IHttpClientBuilder AddRetryHttpClient(this IServiceCollection services, string name, Action <HttpClient> configureClient)
{
if (services == null)
{
throw new ArgumentNullException("services");
}
if (name == null)
{
throw new ArgumentNullException("name");
}
if (configureClient == null)
{
throw new ArgumentNullException("configureClient");
}
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
Polly.Timeout.TimeoutPolicy <HttpResponseMessage> timeout = Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(10));
Polly.Timeout.TimeoutPolicy <HttpResponseMessage> longTimeout = Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(30));
registry.Add("regular", timeout);
registry.Add("long", longTimeout);
return(services.AddHttpClient(name, configureClient)
// Build a totally custom policy using any criteria
.AddPolicyHandler(Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(10)))
// Use a specific named policy from the registry. Simplest way, policy is cached for the
// lifetime of the handler.
.AddPolicyHandlerFromRegistry("regular")
// Run some code to select a policy based on the request
.AddPolicyHandler((request) =>
{
return request.Method == HttpMethod.Get ? timeout : longTimeout;
})
// Run some code to select a policy from the registry based on the request
.AddPolicyHandlerFromRegistry((reg, request) =>
{
return request.Method == HttpMethod.Get ?
reg.Get <IAsyncPolicy <HttpResponseMessage> >("regular") :
reg.Get <IAsyncPolicy <HttpResponseMessage> >("long");
})
// Build a policy that will handle exceptions, 408s, and 500s from the remote server
.AddTransientHttpErrorPolicy(p => p.RetryAsync())
.AddHttpMessageHandler(() => new RetryHandler()));
}
/// <summary>
/// Adds Polly to the services.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/> to add Polly to.</param>
/// <returns>
/// The value specified by <paramref name="services"/>.
/// </returns>
public static IServiceCollection AddPolly(this IServiceCollection services)
{
var sleepDurations = new[]
{
TimeSpan.FromSeconds(1),
TimeSpan.FromSeconds(5),
TimeSpan.FromSeconds(10),
};
var readPolicy = HttpPolicyExtensions.HandleTransientHttpError()
.WaitAndRetryAsync(sleepDurations)
.WithPolicyKey("ReadPolicy");
var writePolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>()
.WithPolicyKey("WritePolicy");
var policies = new[]
{
readPolicy,
writePolicy,
};
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
foreach (var policy in policies)
{
registry.Add(policy.PolicyKey, policy);
}
return(services);
}
private static void RegistrarPolicyGsa(IPolicyRegistry <string> registry)
{
var policy = Policy.Handle <Exception>()
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(60));
registry.Add(PoliticaPolly.PolicyCargaGsa, policy);
}
public void TestInit()
{
_mockConfiguration = new Mock <IConfiguration>();
_mockConfiguration.Setup(c => c["BetfairApi:Url"])
.Returns("http://notarealurl.fab");
_mockConfiguration.Setup(c => c["BetfairApi:AppKeyHeader"])
.Returns("appkeyheader");
_mockConfiguration.Setup(c => c["BetfairApi:SessionTokenHeader"])
.Returns("sessiontokenheader");
_mockHttpMessageHandler = new Mock <HttpMessageHandler>();
_mockRegistry = new PolicyRegistry();
_mockRegistry.Add("thirtySecondTimeoutPolicy", _noOpPolicy);
_mockRegistry.Add("thriceTriplingRetryPolicy", _noOpHttpResponsePolicy);
}
/// <summary>
/// Adds the specified <paramref name="policy"/> to the registry using
/// the <see cref="IsPolicy.PolicyKey"/>.
/// </summary>
/// <param name="registry">
/// The <see cref="IPolicyRegistry{String}"/> to add policies to.
/// </param>
/// <param name="policy">The <see cref="IsPolicy"/> to add.</param>
public static void Add(this IPolicyRegistry <string> registry, IsPolicy?policy)
{
if (registry != null && policy != null)
{
registry.Add(policy.PolicyKey, policy);
}
}
public static void CreateCachingPolicy <T>(this IServiceProvider provider, string cacheKey, ITtlStrategy strategy)
{
IPolicyRegistry <string> registry = provider.GetRequiredService <IPolicyRegistry <string> >();
IAsyncPolicy <T> policy = Policy.CacheAsync <T>(provider.GetRequiredService <IAsyncCacheProvider>().AsyncFor <T>(), strategy);
registry.Add(cacheKey, policy);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IPolicyRegistry <string> policyRegistry, IAsyncCacheProvider memoryCache)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
Func <Context, HttpResponseMessage, Ttl> ttlFilter = (context, result) =>
new Ttl(result.IsSuccessStatusCode ? TimeSpan.FromSeconds(30) : TimeSpan.Zero);
AsyncCachePolicy <HttpResponseMessage> policy =
Policy.CacheAsync(memoryCache.AsyncFor <HttpResponseMessage>(),
new ResultTtl <HttpResponseMessage>(ttlFilter));
policyRegistry.Add("cache", policy);
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
}
public static IServiceCollection AddPolicies(
this IServiceCollection services,
IPolicyRegistry <string> policyRegistry,
string retryPolicyKey,
PolicyOptions policyOptions)
{
if (policyRegistry == null || policyOptions == null)
{
return(services);
}
policyRegistry.Add(
retryPolicyKey,
HttpPolicyExtensions
.HandleTransientHttpError()
.OrResult(msg =>
msg.StatusCode == System.Net.HttpStatusCode.TooManyRequests)
.OrResult(msg => msg?.Headers?.RetryAfter != null)
.WaitAndRetryAsync(
policyOptions.HttpRetry.Count,
retryAttempt =>
TimeSpan.FromMilliseconds(Math.Pow(policyOptions.HttpRetry.BackoffPower, retryAttempt)
* policyOptions.HttpRetry.BackOffBaseMilliseconds)));
return(services);
}
private void ConfigurePolicies(IServiceCollection services)
{
policyRegistry = services.AddPolicyRegistry();
var timeoutPolicy = Policy.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromMilliseconds(1500));
policyRegistry.Add("timeout", timeoutPolicy);
}
public static void WaitAndRetry(ref IPolicyRegistry <string> registry, int retryCount = 5) =>
registry.Add("WaitAndRetry",
HttpPolicyExtensions
.HandleTransientHttpError()
.OrResult(msg => msg.StatusCode == HttpStatusCode.NotFound)
.Or <TimeoutRejectedException>()
.WaitAndRetryAsync(retryCount, retryAttempt
=> TimeSpan.FromSeconds(Math.Pow(2, retryAttempt))));
private static void ConfigureRetryPolicy(IPolicyRegistry <string> registry)
{
var retryPolicy = Policy.Handle <HttpRequestException>()
.OrTransientHttpError()
.RetryAsync(2);
registry.Add(RetryPolicyName, retryPolicy);
}
private static async Task Main()
{
var builder = new HostBuilder()
.ConfigureServices((hostContext, services) =>
{
IPolicyRegistry <string> registry = services.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httWaitAndRetryPolicy =
Policy.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(retryAttempt));
registry.Add("SimpleWaitAndRetryPolicy", httWaitAndRetryPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add("NoOpPolicy", noOpPolicy);
services.AddHttpClient("JsonplaceholderClient", client =>
{
client.BaseAddress = new Uri("https://jsonplaceholder.typicode.com");
client.DefaultRequestHeaders.Add("Accept", "application/json");
}).AddPolicyHandlerFromRegistry((policyRegistry, httpRequestMessage) =>
{
if (httpRequestMessage.Method == HttpMethod.Get)
{
return(policyRegistry.Get <IAsyncPolicy <HttpResponseMessage> >("SimpleWaitAndRetryPolicy"));
}
return(policyRegistry.Get <IAsyncPolicy <HttpResponseMessage> >("NoOpPolicy"));
});
services.AddSingleton <IClientApi, ClientApi>();
services.AddSingleton <IClientFile, ClientFile>();
services.AddSingleton <IHostedService, App>();
services.AddTransient <App>()
.AddLogging(loggingBuilder =>
{
loggingBuilder.ClearProviders();
loggingBuilder.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
loggingBuilder.AddNLog();
});
});
await builder.RunConsoleAsync();
}
public static IPolicyRegistry <string> AddTimeoutPolicy(this IPolicyRegistry <string> registerPolicy)
{
var timeoutPolicy =
Policy
.TimeoutAsync <HttpResponseMessage>(TimeSpan.FromSeconds(15))
.WithPolicyKey(PolicyNames.Timeout);
registerPolicy.Add(PolicyNames.Timeout, timeoutPolicy);
return(registerPolicy);
}
private static void ConfigurePolly(IServiceCollection serviceCollection)
{
IPolicyRegistry <string> registry = serviceCollection.AddPolicyRegistry();
IAsyncPolicy <HttpResponseMessage> httpRetryPolicy = Policy
.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode).RetryAsync(3);
registry.Add("SimpleRetryPolicy", httpRetryPolicy);
IAsyncPolicy <HttpResponseMessage> httpRetryWaitPolicy = Policy
.HandleResult <HttpResponseMessage>(r => !r.IsSuccessStatusCode)
.WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt) / 2));
registry.Add("WaitRetryPolicy", httpRetryWaitPolicy);
IAsyncPolicy <HttpResponseMessage> noOpPolicy = Policy.NoOpAsync()
.AsAsyncPolicy <HttpResponseMessage>();
registry.Add("NoOpPolicy", noOpPolicy);
}
