elmah.mvc - Elmah 例外情報を Web サービスに保存する方法は?

Question

私たちはしばらくエルマを使用してきましたが、UI が情報をデータベースに直接保存しないという新しい要件があり、チームのマネージャーは、エルマに例外情報を Web サービスに送信するように指示できるかどうか尋ねました。誰かがこれを行ったことがありますか、または共有する情報を持っていますか?

Answer 1

私はこれが誰かに役立つことを願って実装しました:

ウェブサービス:

   using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Mail;
using System.Web.Http;
using System.Xml;
using System.Xml.Linq;
using Elmah;
using Newtonsoft.Json;

namespace ElmahExt.Service.Controllers
{
    public class ElmahCommandsController : ApiController
    {
       private readonly string _connection = ConfigurationManager.ConnectionStrings["conSQL"].ConnectionString ;

        [HttpPost]
        public HttpResponseMessage LogError(Error elmahErrorInformation)
        {
            try
            {

                var id = Guid.NewGuid();

                using (SqlConnection cnn = new SqlConnection(_connection))
                using (SqlCommand cmd = SqlCommands.LogError(elmahErrorInformation,id.ToString()))
                {
                    cmd.Connection = cnn;
                    cnn.Open();
                    cmd.ExecuteNonQuery();
                    return Request.CreateResponse(HttpStatusCode.OK, id.ToString());
                }

        }
        catch
        {
            return Request.CreateResponse(HttpStatusCode.ExpectationFailed,string.Empty);
        }

    }

    [HttpGet]
    public HttpResponseMessage GetErrors(string appName, int pageIndex, int pageSize)
    {
        using (SqlConnection cnn = new SqlConnection(_connection))
        using (SqlCommand cmd = SqlCommands.GetErrorsXml(appName, pageIndex, pageSize))
        {
            cmd.Connection = cnn;
            cnn.Open();



            XmlReader reader = cmd.ExecuteXmlReader();

            try
            {
                int? total =(int?)cmd.Parameters["@TotalCount"].Value ?? 0;

                List<string> errors = new List<string>();

                while (reader.IsStartElement("error"))
                    errors.Add(reader.ReadOuterXml());

                XDocument doc = new XDocument(
                    new XElement("GetErrorsResult",
                        new XAttribute("total", total),
                        from string error in errors
                        select new XElement("Error", error)
                        )
                    );

                return Request.CreateResponse(HttpStatusCode.OK, doc.ToString());

            }
            finally
            {
                reader.Close();
            }
        }
    }

    [HttpGet]
    public HttpResponseMessage GetError(string appName, string id)
    {
        Guid errorGuid = new Guid(id);

        string errorXml;

        using (SqlConnection cnn = new SqlConnection(_connection))
        using (SqlCommand cmd = SqlCommands.GetErrorXml(appName, errorGuid))
        {
            cmd.Connection = cnn;
            cnn.Open();
            errorXml = (string)cmd.ExecuteScalar();
        }

        XElement errorEl = (errorXml == null) ? null : new XElement("Error", errorXml);

        XDocument doc = new XDocument(
            new XElement("GetErrorResult", errorEl)
            );
        return Request.CreateResponse(HttpStatusCode.OK, doc.ToString());

    }

}

}

エルマ拡張

   using System;
using System.Collections;
using System.Linq;
using System.Net.Http;
using System.Net.Mail;
using System.Threading.Tasks;
using System.Xml.Linq;
using Elmah;


namespace ElmahExt
{


    public class ServiceErrorLog : ErrorLog
    {



           private string _url;
            public ServiceErrorLog(IDictionary config)
            {
    \\Here config have the information from the configuration in the web config
                ApplicationName = config["applicationName"] as string ?? "";
                _url = config["WebServiceUrl"] as string ?? "";

            }

      static ServiceErrorLog()
        {
            TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;
        }
    private static void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
    {
       e.SetObserved();
    }

    public override string Name => "Custom Elmah provider using web services.";


    /// <summary>
    /// This method log the error information coming from an Elmah call. The result of the web service is received with the guid id of the error but is not waited or returned. 
    /// This implementation was on purpose to continue the processing.
    /// </summary>
    /// <param name="error">Elmah object containing all the information of the exception</param>
    /// <returns></returns>
    public override string Log(Error error)
    {

        Task T = Task.Factory.StartNew(() =>
        {
            using (var client = new HttpClient())
            {
              var result = client.PostAsJsonAsync(_url, error).Result;
            }
        });

        return string.Empty;

    }



    /// <summary>
    /// Return a list of errors to display in the Elmah viewer.
    /// </summary>
    /// <param name="pageIndex">The index of the page to display</param>
    /// <param name="pageSize">The amount of records to display per page</param>
    /// <param name="errorEntryList">The list of errors</param>
    /// <returns>A list of errors in XML format.</returns>
    public override int GetErrors(int pageIndex, int pageSize, IList errorEntryList)
    {
        int total = 0;

        using (var client = new HttpClient())
        {
            _url += $"?pageIndex={pageIndex}&pageSize={pageSize}&appName={ApplicationName}";

            var response = client.GetAsync(_url).Result;

            if (response.IsSuccessStatusCode)
            {

                var result = response.Content.ReadAsAsync<string>().Result;

                XDocument doc = XDocument.Parse(result);
                XElement root = doc.Element("GetErrorsResult");


                if (root != null)
                {
                    var errors = from XElement el in root.Elements("Error")
                        select new
                        {
                            value = el.Value,
                            element = XElement.Parse(el.Value)
                        };

                    foreach (var err in errors)
                    {
                        string errorId = err.element.Attribute("errorId").Value;
                        Error error = ErrorXml.DecodeString(err.value);
                        errorEntryList.Add(new ErrorLogEntry(this, errorId, error));
                    }

                    total = int.Parse(root.Attribute("total").Value);


                }



            }
        }

        return total;
    }


    /// <summary>
    /// Returns an specific error
    /// </summary>
    /// <param name="id">The id of the error.(Guid)</param>
    /// <returns>Returns an XML with the error information.</returns>
    public override ErrorLogEntry GetError(string id)
    {
        ErrorLogEntry errorLogEntry = null;

        using (var client = new HttpClient())
        {
            _url += $"?id={id}&appName={ApplicationName}";

            var response = client.GetAsync(_url).Result;

            if (response.IsSuccessStatusCode)
            {

                var result = response.Content.ReadAsAsync<string>().Result;

                XDocument doc = XDocument.Parse(result);
                XElement root = doc.Element("GetErrorResult");


                XElement errorEl = root?.Element("Error");

                if (errorEl != null)
                {
                    Error error = ErrorXml.DecodeString(errorEl.Value);
                    errorLogEntry = new ErrorLogEntry(this, id, error);
                }
            }


        }

        return errorLogEntry;
    }
}

}

Web 構成で、カスタム プロバイダーを追加する必要があります。

  <errorLog type="ElmahExt.ServiceErrorLog, ElmahExt" applicationName="Elmah Evaluation App" 
                  WebServiceUrl="http://localhost:28382/api/ElmahCommands/LogError" />

この構成セクションでは、Web サービス URL の変数と、カスタム プロバイダーのコンストラクターで使用されるアプリケーションの名前に注意してください。