azure - 在Azure函数上大量使用Azure NotificationHubClient时会引发SocketException

我们正在使用Azure函数通过Azure NotificationHubClient发送推送通知。此功能在实时环境的高峰时间被大量调用，结果，我们从NotificationHubClient.SendNotificationAsync()方法中抛出了许多SocketExceptions。

异常详细信息:

Microsoft.Azure.NotificationHubs.Messaging.MessagingException: Unexpected exception encountered TimeStamp:2020-03-27T04:14:35.4655705Z ---> System.Net.Http.HttpRequestException: Cannot assign requested address ---> System.Net.Sockets.SocketException: Cannot assign requested address
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at Microsoft.Azure.NotificationHubs.NotificationHubClient.SendRequestAsync(HttpRequestMessage request, String trackingId, HttpStatusCode[] successfulResponseStatuses, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at Microsoft.Azure.NotificationHubs.ExceptionsUtility.HandleUnexpectedException(Exception ex, String trackingId)
   at Microsoft.Azure.NotificationHubs.ExceptionsUtility.TranslateToMessagingException(Exception ex, Int32 timeoutInMilliseconds, String trackingId)
   at Microsoft.Azure.NotificationHubs.NotificationHubClient.SendRequestAsync(HttpRequestMessage request, String trackingId, HttpStatusCode[] successfulResponseStatuses, CancellationToken cancellationToken)
   at Microsoft.Azure.NotificationHubs.NotificationHubClient.SendNotificationImplAsync(Notification notification, String tagExpression, String deviceHandle, CancellationToken cancellationToken)

我们创建NotificationHubClient，如下所示:
new NotificationHubClient(connectionString, hubName, new NotificationHubClientSettings { OperationTimeout = TimeSpan.FromSeconds(10) });
我观察到，后面的Microsoft实现在每个新的NotificationHubClient实例化上实例化一个新的HttpClient-可能是问题所在(众所周知的套接字耗尽)，但是我不知道如何解决这个问题。

有谁遇到过同样的问题并设法以某种方式解决它？谢谢

最佳答案

最后，我们通过注入(inject)来克服了这个问题。

    IHttpMessageHandlerFactory _httpMessageHandlerFactory;

在我们的类中，并将其传递给构造函数中的notificationHubClient:

    return new NotificationHubClient(connectionString, hubName,
    new NotificationHubClientSettings
    {
       OperationTimeout = TimeSpan.FromSeconds(10),
       MessageHandler = _httpMessageHandlerFactory.CreateHandler()
    });

关于azure - 在Azure函数上大量使用Azure NotificationHubClient时会引发SocketException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/60886453/