public static void ProcessRequest(HttpContext context, ErrorLog errorLog)
{
var response = context.Response;
response.ContentType = "application/xml";
//
// Retrieve the ID of the requested error and read it from
// the store.
//
var errorId = context.Request.Query["id"].FirstOrDefault();
if (string.IsNullOrEmpty(errorId))
{
throw new ApplicationException("Missing error identifier specification.");
}
var entry = errorLog.GetError(errorId);
//
// Perhaps the error has been deleted from the store? Whatever
// the reason, pretend it does not exist.
//
if (entry == null)
{
context.Response.StatusCode = 404;
}
//
// Stream out the error as formatted XML.
//
var settings = new XmlWriterSettings();
settings.Indent = true;
settings.NewLineOnAttributes = true;
settings.CheckCharacters = false;
var writer = XmlWriter.Create(response.Body, settings);
writer.WriteStartDocument();
writer.WriteStartElement("error");
ErrorXml.Encode(entry.Error, writer);
writer.WriteEndElement(/* error */);
writer.WriteEndDocument();
writer.Flush();
}
/// <summary>
/// Logs an error to the database.
/// </summary>
/// <remarks>
/// Logs an error as a single XML file stored in a folder. XML files are named with a
/// sortable date and a unique identifier. Currently the XML files are stored indefinately.
/// As they are stored as files, they may be managed using standard scheduled jobs.
/// </remarks>
public override string Log(Error error)
{
var logPath = LogPath;
if (!Directory.Exists(logPath))
{
Directory.CreateDirectory(logPath);
}
var errorId = Guid.NewGuid().ToString();
var timeStamp = (error.Time > DateTime.MinValue ? error.Time : DateTime.Now);
var fileName = string.Format(CultureInfo.InvariantCulture,
@"error-{0:yyyy-MM-ddHHmmssZ}-{1}.xml",
/* 0 */ timeStamp.ToUniversalTime(),
/* 1 */ errorId);
var path = Path.Combine(logPath, fileName);
try
{
using (var writer = new XmlTextWriter(path, Encoding.UTF8))
{
writer.Formatting = Formatting.Indented;
writer.WriteStartElement("error");
writer.WriteAttributeString("errorId", errorId);
ErrorXml.Encode(error, writer);
writer.WriteEndElement();
writer.Flush();
}
}
catch (IOException)
{
// If an IOException is thrown during writing the file,
// it means that we will have an either empty or
// partially written XML file on disk. In both cases,
// the file won't be valid and would cause an error in
// the UI.
File.Delete(path);
throw;
}
return(errorId);
}
