protected virtual bool UpdateFilePath(LogFileInfo logFile, FileLogEntry entry, CancellationToken cancellationToken)
{
string filePath = FormatFilePath(logFile, entry);
if (logFile.MaxSize > 0)
{
while (!CheckFileSize(filePath, logFile, entry))
{
cancellationToken.ThrowIfCancellationRequested();
logFile.Counter++;
var newFilePath = FormatFilePath(logFile, entry);
if (filePath == newFilePath)
{
break;
}
filePath = newFilePath;
}
}
if (logFile.CurrentPath == filePath)
{
return(false);
}
logFile.CurrentPath = filePath;
return(true);
}
protected virtual bool CheckFileSize(string filePath, LogFileInfo logFile, FileLogEntry entry)
{
long currentFileSize;
if (logFile.AppendStream == null || logFile.CurrentPath != filePath)
{
IFileInfo fileInfo = logFile.FileAppender.FileProvider.GetFileInfo(Path.Combine(logFile.BasePath, filePath));
if (!fileInfo.Exists)
{
return(true);
}
if (fileInfo.IsDirectory)
{
return(false);
}
currentFileSize = fileInfo.Length;
}
else
{
currentFileSize = logFile.AppendStream.Length;
}
long expectedFileSize = currentFileSize > 0 ? currentFileSize : logFile.Encoding.GetPreamble().Length;
expectedFileSize += logFile.Encoding.GetByteCount(entry.Text);
return(expectedFileSize <= logFile.MaxSize);
}
internal LogEntryWriteFailed(object source, FileLoggerProcessor.LogFileInfo logFile, FileLogEntry logEntry, Exception exception)
{
Source = source;
_logFile = logFile;
_logEntry = logEntry;
Exception = exception;
}
string GetPostfix(LogFileInfo logFile, Encoding fileEncoding, FileLogEntry entry)
{
if (HasPostfix(logFile, entry))
{
var sb = stringBuilder;
stringBuilder = null;
if (sb == null)
{
sb = new StringBuilder();
}
while (true)
{
BuildPostfix(sb, logFile, entry);
var postfix = sb.ToString();
sb.Clear();
if (CheckLogFile(logFile, postfix, fileEncoding, entry))
{
if (sb.Capacity > 64)
{
sb.Capacity = 64;
}
stringBuilder = sb;
return(postfix);
}
}
}
else
{
return(null);
}
}
protected virtual async Task WriteEntryCoreAsync(LogFileInfo logFile, FileLogEntry entry, CancellationToken cancellationToken)
{
if (logFile.AppendStream.Length == 0)
{
var preamble = logFile.Encoding.GetPreamble();
await logFile.AppendStream.WriteAsync(preamble, 0, preamble.Length, cancellationToken).ConfigureAwait(false);
}
var data = logFile.Encoding.GetBytes(entry.Text);
await logFile.AppendStream.WriteAsync(data, 0, data.Length, cancellationToken).ConfigureAwait(false);
}
protected virtual void BuildPostfix(StringBuilder sb, LogFileInfo logFile, FileLogEntry entry)
{
if (!string.IsNullOrEmpty(logFile.Settings.DateFormat))
{
sb.Append('-');
sb.Append(entry.Timestamp.ToLocalTime().ToString(logFile.Settings.DateFormat, CultureInfo.InvariantCulture));
}
if (logFile.Settings.MaxFileSize > 0)
{
sb.Append('-');
sb.Append(logFile.Counter.ToString(logFile.Settings.CounterFormat, CultureInfo.InvariantCulture));
}
}
async Task WriteEntryAsync(LogFileInfo logFile, FileLogEntry entry, CancellationToken disposeToken)
{
// discarding remaining entries if queue got disposed
disposeToken.ThrowIfCancellationRequested();
Encoding fileEncoding;
string filePath;
bool ensureBasePath;
_settingsLock.EnterReadLock();
try
{
fileEncoding = GetFileEncoding(logFile, entry);
var postfix = GetPostfix(logFile, fileEncoding, entry);
filePath = logFile.GetFilePath(postfix);
ensureBasePath = Settings.EnsureBasePath;
}
finally { _settingsLock.ExitReadLock(); }
var fileInfo = Context.FileProvider.GetFileInfo(filePath);
while (true)
{
try
{
await Context.AppendAllTextAsync(fileInfo, entry.Text, fileEncoding).ConfigureAwait(false);
return;
}
catch
{
if (ensureBasePath)
{
try
{
if (await Context.EnsureDirAsync(fileInfo).ConfigureAwait(false))
{
await Context.AppendAllTextAsync(fileInfo, entry.Text, fileEncoding).ConfigureAwait(false);
return;
}
}
catch { }
}
}
// discarding failed entry if queue got disposed
await Task.Delay(1000, disposeToken).ConfigureAwait(false);
}
}
async Task WriteEntryAsync(LogFileInfo logFile, FileLogEntry entry, CancellationToken shutdownToken)
{
// discarding remaining entries on shutdown
shutdownToken.ThrowIfCancellationRequested();
var fileAppender = GetFileAppender(logFile);
var fileEncoding = GetFileEncoding(logFile, entry);
var postfix = GetPostfix(logFile, fileAppender, fileEncoding, entry);
var filePath = logFile.GetFilePath(postfix);
var ensureBasePath = logFile.Settings.EnsureBasePath;
var fileInfo = fileAppender.FileProvider.GetFileInfo(filePath);
while (true)
{
try
{
await fileAppender.AppendAllTextAsync(fileInfo, entry.Text, fileEncoding, shutdownToken).ConfigureAwait(false);
return;
}
catch
{
if (ensureBasePath)
{
try
{
if (await fileAppender.EnsureDirAsync(fileInfo, shutdownToken).ConfigureAwait(false))
{
await fileAppender.AppendAllTextAsync(fileInfo, entry.Text, fileEncoding, shutdownToken).ConfigureAwait(false);
return;
}
}
catch { }
}
}
// discarding failed entry on shutdown
if (Context.WriteRetryDelay > TimeSpan.Zero)
{
await Task.Delay(Context.WriteRetryDelay, shutdownToken).ConfigureAwait(false);
}
else
{
shutdownToken.ThrowIfCancellationRequested();
}
}
}
protected virtual string FormatFilePath(LogFileInfo logFile, FileLogEntry entry)
{
return(Regex.Replace(logFile.PathFormat, @"<(date|counter)(?::([^<>]+))?>", match =>
{
var inlineFormat = match.Groups[2].Value;
switch (match.Groups[1].Value)
{
case "date": return GetDate(inlineFormat.Length > 0 ? inlineFormat : null, logFile, entry);
case "counter": return GetCounter(inlineFormat.Length > 0 ? inlineFormat : null, logFile, entry);
default: throw new InvalidOperationException();
}
}));
}
public void Enqueue(string fileName, FileLogEntry entry)
{
LogFileInfo logFile;
lock (_logFiles)
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(FileLoggerProcessor));
}
if (Context.CompleteToken.IsCancellationRequested)
{
return;
}
if (!_logFiles.TryGetValue(fileName, out logFile))
{
logFile = CreateLogFile();
logFile.BasePath = Settings.BasePath;
logFile.FileName = Path.ChangeExtension(fileName, null);
logFile.Extension = Path.GetExtension(fileName);
logFile.Queue = new ActionBlock <FileLogEntry>(
e => WriteEntryAsync(logFile, e, _disposeTokenSource.Token),
new ExecutionDataflowBlockOptions
{
MaxDegreeOfParallelism = 1,
BoundedCapacity = Settings.MaxQueueSize,
});
_logFiles.Add(fileName, logFile);
}
}
logFile.Queue.Post(entry);
}
public void Enqueue(FileLogEntry entry, ILogFileSettings fileSettings, IFileLoggerSettings settings)
{
LogFileInfo logFile;
lock (_logFiles)
{
if (_status == Status.Completed)
{
throw new ObjectDisposedException(nameof(FileLoggerProcessor));
}
if (_status != Status.Running)
{
return;
}
if (!_logFiles.TryGetValue(fileSettings, out logFile))
{
_logFiles.Add(fileSettings, logFile = CreateLogFile(fileSettings, settings));
}
}
logFile.Queue.Post(entry);
}
public void Enqueue(string fileName, FileLogEntry entry)
{
LogFileInfo logFile;
lock (_logFiles)
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(FileLoggerProcessor));
}
if (Context.CompleteToken.IsCancellationRequested)
{
return;
}
if (!_logFiles.TryGetValue(fileName, out logFile))
{
_logFiles.Add(fileName, logFile = CreateLogFile(fileName));
}
}
logFile.Queue.Post(entry);
}
public LogFilePathFormatContext(FileLoggerProcessor processor, LogFileInfo logFile, FileLogEntry logEntry)
{
_processor = processor;
_logFile = logFile;
_logEntry = logEntry;
}
protected virtual string GetCounter(string inlineFormat, LogFileInfo logFile, FileLogEntry entry)
{
return(logFile.Counter.ToString(inlineFormat ?? logFile.CounterFormat, CultureInfo.InvariantCulture));
}
internal LogEntryDropped(object source, FileLoggerProcessor.LogFileInfo logFile, FileLogEntry logEntry)
{
Source = source;
_logFile = logFile;
_logEntry = logEntry;
}
private async Task WriteEntryAsync(LogFileInfo logFile, FileLogEntry entry, CancellationToken cancellationToken)
{
// discarding remaining entries on forced complete
cancellationToken.ThrowIfCancellationRequested();
WriteEntryState state = WriteEntryState.CheckFile;
IFileInfo fileInfo = null;
for (; ;)
{
switch (state)
{
case WriteEntryState.CheckFile:
try
{
if (UpdateFilePath(logFile, entry, cancellationToken) && logFile.AppendStream != null)
{
logFile.CloseAppendStream();
}
state = logFile.AppendStream == null ? WriteEntryState.TryCreateStream : WriteEntryState.Write;
}
catch (Exception ex) when(!(ex is OperationCanceledException))
{
state = WriteEntryState.Idle;
}
break;
case WriteEntryState.TryCreateStream:
try
{
fileInfo = logFile.FileAppender.FileProvider.GetFileInfo(Path.Combine(logFile.BasePath, logFile.CurrentPath));
logFile.AppendStream = logFile.FileAppender.CreateAppendStream(fileInfo);
state = WriteEntryState.Write;
}
catch (Exception ex) when(!(ex is OperationCanceledException))
{
state = WriteEntryState.RetryCreateStream;
}
break;
case WriteEntryState.RetryCreateStream:
try
{
if (await logFile.FileAppender.EnsureDirAsync(fileInfo, cancellationToken).ConfigureAwait(false))
{
logFile.AppendStream = logFile.FileAppender.CreateAppendStream(fileInfo);
state = WriteEntryState.Write;
}
else
{
state = WriteEntryState.Idle;
}
}
catch (Exception ex) when(!(ex is OperationCanceledException))
{
// discarding entry when file path is invalid
if (logFile.CurrentPath.IndexOfAny(s_invalidPathChars.Value) >= 0)
{
return;
}
state = WriteEntryState.Idle;
}
break;
case WriteEntryState.Write:
try
{
try
{
await WriteEntryCoreAsync(logFile, entry, cancellationToken).ConfigureAwait(false);
if (logFile.AccessMode == LogFileAccessMode.KeepOpenAndAutoFlush)
{
// FlushAsync is extremely slow currently
// https://github.com/dotnet/corefx/issues/32837
logFile.AppendStream.Flush();
}
}
finally
{
if (logFile.AccessMode == LogFileAccessMode.OpenTemporarily)
{
logFile.CloseAppendStream();
}
}
return;
}
catch (Exception ex) when(!(ex is OperationCanceledException))
{
state = WriteEntryState.Idle;
}
break;
case WriteEntryState.Idle:
// discarding failed entry on forced complete
if (Context.WriteRetryDelay > TimeSpan.Zero)
{
await Task.Delay(Context.WriteRetryDelay, cancellationToken).ConfigureAwait(false);
}
else
{
cancellationToken.ThrowIfCancellationRequested();
}
state = WriteEntryState.CheckFile;
break;
}
}
}
protected virtual bool CheckLogFile(LogFileInfo logFile, string postfix, IFileAppender fileAppender, Encoding fileEncoding, FileLogEntry entry)
{
if (logFile.Settings.MaxFileSize > 0)
{
var fileInfo = fileAppender.FileProvider.GetFileInfo(logFile.GetFilePath(postfix));
if (fileInfo.Exists &&
(fileInfo.IsDirectory || fileInfo.Length + fileEncoding.GetByteCount(entry.Text) > logFile.Settings.MaxFileSize))
{
logFile.Counter++;
return(false);
}
}
return(true);
}
protected virtual Encoding GetFileEncoding(LogFileInfo logFile, FileLogEntry entry)
{
return(Settings.FileEncoding);
}
protected virtual bool HasPostfix(LogFileInfo logFile, FileLogEntry entry)
{
return(!string.IsNullOrEmpty(logFile.Settings.DateFormat) || logFile.Settings.MaxFileSize > 0);
}
protected virtual Encoding GetFileEncoding(LogFileInfo logFile, FileLogEntry entry)
{
return(logFile.Settings.FileEncoding ?? Encoding.UTF8);
}
protected virtual string GetDate(string inlineFormat, LogFileInfo logFile, FileLogEntry entry)
{
return(entry.Timestamp.ToLocalTime().ToString(inlineFormat ?? logFile.DateFormat, CultureInfo.InvariantCulture));
}