public static async Task ProcessRequest(HttpContext context, ErrorLog errorLog, string elmahRoot)
{
const int pageSize = 15;
var entries = new List <ErrorLogEntry>(pageSize);
var log = errorLog;
await log.GetErrorsAsync(0, pageSize, entries);
var response = context.Response;
response.ContentType = "application/xml";
var title = $@"Error log of {log.ApplicationName} on {Environment.MachineName}";
var link = $"{context.Request.Scheme}://{context.Request.Host}{elmahRoot}";
var baseUrl = new Uri(link.TrimEnd('/') + "/");
var items =
from entry in entries
let error = entry.Error
select RssXml.Item(
error.Message,
"An error of type " + error.Type + " occurred. " + error.Message,
error.Time,
baseUrl + "detail?id=" + Uri.EscapeDataString(entry.Id));
var rss = RssXml.Rss(title, link, "AddMessage of recent errors", items);
await response.WriteAsync(XmlText.StripIllegalXmlCharacters(rss.ToString()));
}
private static IEnumerable <XElement> GetItems(ErrorLog log, Uri baseUrl, int pageSize, int maxPageLimit)
{
Debug.Assert(log != null);
Debug.Assert(baseUrl != null);
Debug.Assert(baseUrl.IsAbsoluteUri);
Debug.Assert(pageSize > 0);
var runningDay = DateTime.MaxValue;
var runningErrorCount = 0;
string title = null;
DateTime?pubDate = null;
var sb = new StringBuilder();
var writer = new StringWriter(sb);
var source = GetErrors(log, pageSize, (p, e) => new { PageIndex = p, Entry = e });
foreach (var entry in from item in source.TakeWhile(e => e.PageIndex < maxPageLimit)
select item.Entry)
{
var error = entry.Error;
var time = error.Time.ToUniversalTime();
var day = time.Date;
//
// If we're dealing with a new day then break out to a
// new channel item, finishing off the previous one.
//
if (day < runningDay)
{
if (runningErrorCount > 0)
{
RenderEnd(writer);
Debug.Assert(title != null);
Debug.Assert(pubDate != null);
yield return(RssXml.Item(title, sb.ToString(), pubDate.Value));
}
runningDay = day;
runningErrorCount = 0;
pubDate = time;
title = $"Digest for {runningDay:yyyy-MM-dd} ({runningDay.ToLongDateString()})";
sb.Length = 0;
RenderStart(writer);
}
RenderError(writer, entry, baseUrl);
runningErrorCount++;
}
if (runningErrorCount > 0)
{
RenderEnd(writer);
Debug.Assert(title != null);
Debug.Assert(pubDate != null);
yield return(RssXml.Item(title, sb.ToString(), pubDate.Value));
}
}