c# - 索引格式每天更改为每周

Question

我目前正在将我的日志从 Nlog 发送到 ElasticSearch。我每天都在创建索引，并将日志发送到该索引。我想创建 Index Weekly，所以我想更改配置文件。

我在 NLog 配置文件中创建索引。 index = "logstash-${date:format=yyyy.MM.dd}"

我的 NLog 配置部分:

  <target xsi:type="ElasticSearch" 
    index = "logstash-${date:format=yyyy.MM.dd}"
    uri="http://localhost:9200" 
    includeAllProperties ="true">
   </target>

我发现在一些论坛 ( https://github.com/logstash-plugins/logstash-output-elasticsearch/issues/541#issuecomment-270923437 ) 每周更改我应该使用像 xxxx.ww。我试图像这样更改配置文件: index = "logstash-${date:format=xxxx.ww}"

不幸的是，这是给我的结果 logstash-xxxx.ww，我期望结果 logstash-2019.25

那么如何将每日更改为每周？

Answer 1

${date} 接受与 DateTime.ToString 相同的格式。不幸的是，.NET 没有 ww 或 weeknumber 格式(参见 Custom date and time format strings - .NET | Microsoft Docs)

论坛上的链接谈论的是 Joda Time，它是一个用于 Java 而不是 .NET 的库。

您可以使用 NLog 中的自定义布局渲染器解决此问题。在 .NET 中获取周数有点棘手，这是从 Get the correct week number of a given date 得到的:

// This presumes that weeks start with Monday.
// Week 1 is the 1st week of the year with a Thursday in it.
public static int GetIso8601WeekOfYear(DateTime time)
{
    // Seriously cheat.  If its Monday, Tuesday or Wednesday, then it'll 
    // be the same week# as whatever Thursday, Friday or Saturday are,
    // and we always get those right
    DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(time);
    if (day >= DayOfWeek.Monday && day <= DayOfWeek.Wednesday)
    {
        time = time.AddDays(3);
    }

    // Return the week of our adjusted day
    return CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(time, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
}

创建一个渲染 2019.25 等的布局渲染器(参见 NLog docs - How to write a custom layout renderer)

using NLog.LayoutRenderers;
using NLog;
...

// register ${myDateTime}. Register a soon as possible (e.g main(), app_start etc)
LayoutRenderer.Register("myDateTime", logEventInfo => 
    logEventInfo.TimeStamp.Year +"." + GetIso8601WeekOfYear(logEventInfo.TimeStamp));

现在这应该可以工作了:

index = "logstash-${myDateTime}"