private FileLogSink(LogGroupMutex logGroupMutex,
string logFileDir,
string logFileNameBase,
int rotateLogFileWhenLargerBytes,
FileStream logStream,
int initialRotationIndex,
DefaultFormat.Options formatOptions)
{
_logSessionId = Guid.NewGuid();
_logGroupMutex = logGroupMutex;
_logFileDir = logFileDir;
_logFileNameBase = logFileNameBase;
_rotateLogFileWhenLargerBytes = (rotateLogFileWhenLargerBytes <= 0) ? -1 : rotateLogFileWhenLargerBytes;
_logStream = logStream;
_logWriter = new StreamWriter(logStream, LogTextEncoding);
_rotationIndex = initialRotationIndex;
_formatOptions = formatOptions ?? DefaultFormatOptions;
}
/// <summary>
/// Attention: All loggers from all processes that write to the same <c>logFileNameBase</c> MUST use the same value for <c>rotateLogFileWhenLargerBytes</c>!
/// </summary>
public static bool TryCreateNew(
string logFileDir,
string logFileNameBase,
Guid logGroupId,
int rotateLogFileWhenLargerBytes,
DefaultFormat.Options formatOptions,
out FileLogSink newSink)
{
// Bad usage - throw.
if (logFileNameBase == null)
{
throw new ArgumentNullException(nameof(logFileNameBase));
}
if (String.IsNullOrWhiteSpace(logFileNameBase))
{
throw new ArgumentException($"{nameof(logFileNameBase)} may not be white-space only.", nameof(logFileNameBase));
}
// Ok usage, but bad state - do not throw and return false.
newSink = null;
if (String.IsNullOrWhiteSpace(logFileDir))
{
return(false);
}
// Normalize in respect to final dir separator:
logFileDir = Path.GetDirectoryName(Path.Combine(logFileDir, "."));
// Ensure the directory exists:
if (!EnsureDirectoryExists(logFileDir, out DirectoryInfo logFileDirInfo))
{
return(false);
}
LogGroupMutex logGroupMutex = null;
try
{
logGroupMutex = new LogGroupMutex(logGroupId);
if (!logGroupMutex.TryAcquire(out LogGroupMutex.Handle logGroupMutexHandle))
{
logGroupMutex.Dispose();
return(false);
}
using (logGroupMutexHandle)
{
DateTimeOffset now = DateTimeOffset.Now;
int rotationIndex = FindLatestRotationIndex(logFileDirInfo, logFileNameBase, now);
string logFileName = ConstructFilename(logFileNameBase, now, rotationIndex);
string logFilePath = Path.Combine(logFileDir, logFileName);
FileStream logStream = new FileStream(logFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
newSink = new FileLogSink(logGroupMutex, logFileDir, logFileNameBase, rotateLogFileWhenLargerBytes, logStream, rotationIndex, formatOptions);
}
if (newSink.TryLogInfo(
SelfLogSourceInfo.WithCallInfo().WithAssemblyName(),
"Logging session started",
new object[]
{
"LogGroupId",
newSink.LogGroupId,
"LogSessionId",
newSink.LogSessionId,
"RotateLogFileWhenLargerBytes",
newSink.RotateLogFileWhenLargerBytes
}))
{
return(true);
}
}
catch
{ }
// If we did not succeed, the sink may be still constructed (e.g. TryLogInfo(..) returned false).
// We need to dispose the sink before giving up, but be brepaed for it to sbe null.
try
{
if (newSink != null)
{
newSink.Dispose(); // This will also dispose the logGroupMutex owned by the newSink.
}
else
{
logGroupMutex.Dispose();
}
}
catch
{ }
newSink = null;
return(false);
}