private ErrorLogEntry LoadErrorLogEntry(string path)
{
for (var i = 0; i < 5; i++)
{
try
{
using var reader = XmlReader.Create(path, new XmlReaderSettings()
{
CheckCharacters = false
});
if (!reader.IsStartElement("error"))
{
return(null);
}
var id = reader.GetAttribute("errorId");
var error = ErrorXml.Decode(reader);
return(new ErrorLogEntry(this, id, error));
}
catch (IOException)
{
//ignored
Task.Delay(500).GetAwaiter().GetResult();
}
}
throw new IOException("");
}
/// <summary>
/// Returns the specified error from the filesystem, or throws an exception if it does not exist.
/// </summary>
public override ErrorLogEntry GetError(string id)
{
try
{
id = new Guid(id).ToString(); // validate GUID
}
catch (FormatException e)
{
throw new ArgumentException(e.Message, id, e);
}
var file = new DirectoryInfo(LogPath).GetFiles($"error-*-{id}.xml")
.FirstOrDefault();
if (file == null)
{
return(null);
}
if (!IsUserFile(file.Attributes))
{
return(null);
}
using var reader = XmlReader.Create(file.FullName);
return(new ErrorLogEntry(this, id, ErrorXml.Decode(reader)));
}
private void ErrorsXmlToList(XmlReader reader, ICollection <ErrorLogEntry> errorEntryList)
{
Debug.Assert(reader != null);
if (errorEntryList != null)
{
while (reader.IsStartElement("error"))
{
string id = reader.GetAttribute("errorId");
Error error = ErrorXml.Decode(reader);
errorEntryList.Add(new ErrorLogEntry(this, id, error));
}
}
}
private ErrorLogEntry LoadErrorLogEntry(string path)
{
using (var reader = XmlReader.Create(path))
{
if (!reader.IsStartElement("error"))
{
return(null);
}
var id = reader.GetAttribute("errorId");
var error = ErrorXml.Decode(reader);
return(new ErrorLogEntry(this, id, error));
}
}
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);
}
/// <summary>
/// Returns the specified error from the database, or null
/// if it does not exist.
/// </summary>
public override ErrorLogEntry GetError(string id)
{
if (id == null)
{
throw new ArgumentNullException("id");
}
if (id.Length == 0)
{
throw new ArgumentException(null, "id");
}
Guid errorGuid;
try
{
errorGuid = new Guid(id);
}
catch (FormatException e)
{
throw new ArgumentException(e.Message, "id", e);
}
string errorXml;
using (SqlConnection connection = new SqlConnection(this.ConnectionString))
using (SqlCommand command = Commands.GetErrorXml(this.ApplicationName, errorGuid))
{
command.Connection = connection;
connection.Open();
errorXml = (string)command.ExecuteScalar();
}
if (errorXml == null)
{
return(null);
}
Error error = ErrorXml.DecodeString(errorXml);
return(new ErrorLogEntry(this, id, error));
}
/// <summary>
/// Returns the specified error from the database, or null
/// if it does not exist.
/// </summary>
public override ErrorLogEntry GetError(string id)
{
if (id == null)
{
throw new ArgumentNullException("id");
}
if (id.Length == 0)
{
throw new ArgumentException(null, "id");
}
string errorXml = string.Empty;
var connections = new List <string>();
if (this.ConnectionString.Contains(","))
{
foreach (var connection in this.ConnectionString.Split(','))
{
connections.Add(connection);
}
}
var redisManager = connections.Count() == 0 ? new RedisManagerPool(this.ConnectionString) : new RedisManagerPool(connections);
using (var client = redisManager.GetClient())
{
Guid errorGuid = new Guid(id);
var redis = client.As <RedisObject>();
var redisObject = redis.GetById(errorGuid);
if (redisObject != null)
{
errorXml = redisObject.AllXml;
}
}
if (errorXml == null)
{
return(null);
}
Error error = ErrorXml.DecodeString(errorXml);
return(new ErrorLogEntry(this, id, error));
}
/// <summary>
/// Logs an error to the database.
/// </summary>
/// <remarks>
/// Use the stored procedure called by this implementation to set a
/// policy on how long errors are kept in the log. The default
/// implementation stores all errors for an indefinite time.
/// </remarks>
public override string Log(Error error)
{
if (error == null)
{
throw new ArgumentNullException("error");
}
string errorXml = ErrorXml.EncodeString(error);
Guid id = Guid.NewGuid();
var connections = new List <string>();
if (this.ConnectionString.Contains(","))
{
foreach (var connection in this.ConnectionString.Split(','))
{
connections.Add(connection);
}
}
var redisManager = connections.Count() == 0 ? new RedisManagerPool(this.ConnectionString) : new RedisManagerPool(connections);
using (var client = redisManager.GetClient())
{
var redis = client.As <RedisObject>();
var redisObject = new RedisObject()
{
AllXml = errorXml,
Application = this.ApplicationName,
ErrorId = id,
Host = error.HostName,
Message = error.Message,
Source = error.Source,
StatusCode = error.StatusCode,
TimeUtc = error.Time.ToUniversalTime(),
Type = error.Type,
User = error.User,
Id = id
};
redis.AddToRecentsList(redisObject);
redis.Store(redisObject);
}
return(id.ToString());
}
/// <summary>
/// Logs an error to the database.
/// </summary>
/// <remarks>
/// Use the stored procedure called by this implementation to set a
/// policy on how long errors are kept in the log. The default
/// implementation stores all errors for an indefinite time.
/// </remarks>
public override string Log(Error error)
{
if (error == null)
{
throw new ArgumentNullException("error");
}
string errorXml = ErrorXml.EncodeString(error);
Guid id = Guid.NewGuid();
using (SqlConnection connection = new SqlConnection(this.ConnectionString))
using (SqlCommand command = Commands.LogError(
id, this.ApplicationName,
error.HostName, error.Type, error.Source, error.Message, error.User,
error.StatusCode, error.Time.ToUniversalTime(), errorXml))
{
command.Connection = connection;
connection.Open();
command.ExecuteNonQuery();
return(id.ToString());
}
}
/// <summary>
/// Returns a page of errors from the databse in descending order
/// of logged time.
/// </summary>
public override int GetErrors(int pageIndex, int pageSize, ICollection <ErrorLogEntry> errorEntryList)
{
if (pageIndex < 0)
{
throw new ArgumentOutOfRangeException("pageIndex", pageIndex, null);
}
if (pageSize < 0)
{
throw new ArgumentOutOfRangeException("pageSize", pageSize, null);
}
var connections = new List <string>();
if (this.ConnectionString.Contains(","))
{
foreach (var connection in this.ConnectionString.Split(','))
{
connections.Add(connection);
}
}
var redisManager = connections.Count() == 0 ? new RedisManagerPool(this.ConnectionString) : new RedisManagerPool(connections);
using (var client = redisManager.GetClient())
{
var redis = client.As <RedisObject>();
var index = pageIndex - 1;
var objects = redis.GetLatestFromRecentsList(1, pageSize);
foreach (var redisError in objects)
{
errorEntryList.Add(new ErrorLogEntry(this, redisError.ErrorId.ToString(), ErrorXml.DecodeString(redisError.AllXml)));
}
var total = client.As <RedisObject>().GetAll().Count();
return(total);
}
}
