使用 Azure Function App 测量请求处理时间

Question

我需要测量在 Azure Function App 中处理每个请求所花费的时间，如下面通过 ASP.NET（非 ASP.NET CORE）

public class RequestLogHandler : DelegatingHandler
    {
        private readonly ILogger _logger;

        public RequestLogHandler(ILogger logger)
        {
            _logger = logger;
        }

        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            string path = request.GetOwinContext().Request.Path.ToString();
            string method = request.Method.Method;

            var sw = Stopwatch.StartNew();

            var response = await base.SendAsync(request, cancellationToken);

            sw.Stop();

            int statusCode = (int)response.StatusCode;

            _logger.HttpRequest(path, method, sw.ElapsedMilliseconds.ToString(), statusCode.ToString());

            return response;
        }
    }

设置

 public class WebServer : IWebServer
    {
        private readonly ILogger _logger;
        private readonly HttpConfiguration _httpConfiguration;

        private IDisposable _server;

        public WebServer(ILogger logger, HttpConfiguration httpConfiguration)
        {
            _logger = logger;
            _httpConfiguration = httpConfiguration;
        }

        public void Start(string url)
        {
            _server = WebApp.Start(url, (appBuilder) =>
            {
                _httpConfiguration.MapHttpAttributeRoutes();
                _httpConfiguration.MessageHandlers.Add(new RequestLogHandler(_logger));

                appBuilder.UseWebApi(_httpConfiguration);
            });
        }

        public void Dispose()
        {
            if(_server != null)
            {
                _server.Dispose();
                _server = null;
            }
        }
    }

Answer 1

您可以使用Application Insights 获取请求持续时间，在应用洞察页面中您可以获取请求持续时间的详细信息。

这是Duration description：此字段是必需的，因为请求遥测表示具有开头和结尾的操作。您还可以使用 Microsoft.ApplicationInsights NuGet 包来send custom telemetry data 到 Application Insights，包括 Duration。