限制 Elmah 发送的电子邮件数量

发布于 2024-08-16 22:41:24 字数 388 浏览 7 评论 0原文

有谁知道有什么好方法可以像健康监控一样限制 Elmah 在一段时间内发送的电子邮件数量？

我希望能够将每个页面中每个错误的电子邮件限制为针对该特定错误和页面每小时左右发送一次电子邮件。

查看 elmah 文档，它看起来像

void ErrorMail_Filtering(object sender, ExceptionFilterEventArgs e)
{
    // perform filtering here   
}

在 global.ascx 文件中使用：可能是一个选项。我可以为每个应用程序设置一个静态对象，其中包含一些错误详细信息和记录的时间并检查它并在需要时取消电子邮件通知？

有谁有更好的解决方案或他们现在正在使用的示例？

原文

Does anyone know of a good way to limit the number of emails sent by Elmah during a time period like you can with Health Monitoring?

I want to be able to limit the emails for each error from each page to only an email once an hour or so for that particular error and page.

Looking at the elmah documentation it looks like using:

void ErrorMail_Filtering(object sender, ExceptionFilterEventArgs e)
{
    // perform filtering here   
}

in the global.ascx file might be an option. I could setup a static object per application that contains some the error details and the time logged and check it and cancel the email notification if need be?

Do anyone have a better solution or an example of what they are using now?

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夜巴黎 2024-08-23 22:41:24

我用与你问题中相同的方法写了这篇文章。看起来效果很好。

public static DateTime  RoundUp(this DateTime dt, TimeSpan d)
{
    return new DateTime(((dt.Ticks + d.Ticks - 1) / d.Ticks) * d.Ticks);
}
static ConcurrentDictionary<int, KeyValuePair<DateTime, string>> _concurrent = new ConcurrentDictionary<int, KeyValuePair<DateTime, string>>();

/// <summary>
/// This is an Elmah event used by the elmah engine when sending out emails. It provides an opportunity to weed out 
/// irrelavent emails.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void ErrorMail_Filtering(object sender, ExceptionFilterEventArgs e)
{
    preventSpammingDigestEmail(e);
}

/// <summary>
/// Prevents spamming by throttling emails to 5 minute intervals.
/// </summary>
/// <param name="e"></param>
private static void preventSpammingDigestEmail(ExceptionFilterEventArgs e)
{
    DateTime roundedTimeStamp = DateTime.Now.RoundUp(TimeSpan.FromMinutes(5));
    string serialisedException = Util.SerializeException(e.Exception);

    var lastRaisedException = new KeyValuePair<DateTime, string>
        (roundedTimeStamp, serialisedException);

    int key = lastRaisedException.GetHashCode();

    bool errorHasAlreadyBeenRaised = _concurrent.ContainsKey(key);

    // If event has already been raised in the last five minutes dont raise again
    if (errorHasAlreadyBeenRaised)
    {
        e.Dismiss();
        return;
    }

    // Record that it has been raised
    _concurrent.TryAdd(key, lastRaisedException);

    // Clean up existing entries
    Task.Factory.StartNew(() =>
        {
            var toRemove =
                _concurrent.Where(pair => pair.Value.Key < DateTime.Now.Date).Select(pair => pair.Key).ToArray();

            foreach (var i in toRemove)
            {
                KeyValuePair<DateTime, string> keyValuePair;
                _concurrent.TryRemove(i, out keyValuePair);
            }
        });
}

private static string SerializeException(Exception e, string exceptionMessage = "")
{
    if (e == null)
        return String.Empty; 
    exceptionMessage = String.Format("{0}{1}{2}\n{3}", exceptionMessage, (exceptionMessage == String.Empty) 
        ? String.Empty 
        : "\n\n", e.Message, e.StackTrace);
    if (e.InnerException != null) 
        exceptionMessage = SerializeException(e.InnerException, exceptionMessage); 
    return exceptionMessage;
}

I wrote this using the same method as in your question. Seems to work nicely.

public static DateTime  RoundUp(this DateTime dt, TimeSpan d)
{
    return new DateTime(((dt.Ticks + d.Ticks - 1) / d.Ticks) * d.Ticks);
}
static ConcurrentDictionary<int, KeyValuePair<DateTime, string>> _concurrent = new ConcurrentDictionary<int, KeyValuePair<DateTime, string>>();

/// <summary>
/// This is an Elmah event used by the elmah engine when sending out emails. It provides an opportunity to weed out 
/// irrelavent emails.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void ErrorMail_Filtering(object sender, ExceptionFilterEventArgs e)
{
    preventSpammingDigestEmail(e);
}

/// <summary>
/// Prevents spamming by throttling emails to 5 minute intervals.
/// </summary>
/// <param name="e"></param>
private static void preventSpammingDigestEmail(ExceptionFilterEventArgs e)
{
    DateTime roundedTimeStamp = DateTime.Now.RoundUp(TimeSpan.FromMinutes(5));
    string serialisedException = Util.SerializeException(e.Exception);

    var lastRaisedException = new KeyValuePair<DateTime, string>
        (roundedTimeStamp, serialisedException);

    int key = lastRaisedException.GetHashCode();

    bool errorHasAlreadyBeenRaised = _concurrent.ContainsKey(key);

    // If event has already been raised in the last five minutes dont raise again
    if (errorHasAlreadyBeenRaised)
    {
        e.Dismiss();
        return;
    }

    // Record that it has been raised
    _concurrent.TryAdd(key, lastRaisedException);

    // Clean up existing entries
    Task.Factory.StartNew(() =>
        {
            var toRemove =
                _concurrent.Where(pair => pair.Value.Key < DateTime.Now.Date).Select(pair => pair.Key).ToArray();

            foreach (var i in toRemove)
            {
                KeyValuePair<DateTime, string> keyValuePair;
                _concurrent.TryRemove(i, out keyValuePair);
            }
        });
}

private static string SerializeException(Exception e, string exceptionMessage = "")
{
    if (e == null)
        return String.Empty; 
    exceptionMessage = String.Format("{0}{1}{2}\n{3}", exceptionMessage, (exceptionMessage == String.Empty) 
        ? String.Empty 
        : "\n\n", e.Message, e.StackTrace);
    if (e.InnerException != null) 
        exceptionMessage = SerializeException(e.InnerException, exceptionMessage); 
    return exceptionMessage;
}

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