public async Task AmbientFileLoggerBasic()
{
string tempPath = Path.GetTempPath() + Guid.NewGuid().ToString("N");
try
{
using (AmbientClock.Pause())
using (AmbientFileLogger loggerImp = new AmbientFileLogger(tempPath, ".log", 8 * 60))
{
// delete any preexisting files
await AmbientFileLogger.TryDeleteAllFiles(loggerImp.FilePrefix);
using (IDisposable over = Logger.ScopedLocalOverride(loggerImp))
{
IAmbientLogger logger = Logger.Local;
// log the first test message (this will cause the file to be created, but only *after* this message gets flushed
logger?.Log("test1");
Assert.AreEqual(0, TempFileCount(tempPath));
if (logger != null)
{
await logger.Flush();
}
Assert.AreEqual(1, TempFileCount(tempPath));
// log the second test message (since the clock is stopped, this will *never* create another file)
logger?.Log("test2");
if (logger != null)
{
await logger.Flush();
}
Assert.AreEqual(1, TempFileCount(tempPath));
}
}
}
finally
{
await AmbientFileLogger.TryDeleteAllFiles(tempPath);
}
}
public async Task AmbientFileLoggerExceptions()
{
Assert.ThrowsException <ArgumentOutOfRangeException>(() => new AmbientFileLogger(null, "log"));
try
{
await AmbientFileLogger.TryDeleteAllFiles(null !);
Assert.Fail("No ArgumentException thrown!");
}
catch (ArgumentException)
{
// this is what we were expecting!
}
try
{
await AmbientFileLogger.TryDeleteAllFiles("C:\\");
Assert.Fail("No ArgumentException thrown!");
}
catch (ArgumentException)
{
// this is what we were expecting!
}
}
public async Task AmbientFileLoggerFileRotation()
{
string logFilePrefix = null;
try
{
using (AmbientClock.Pause())
using (AmbientFileLogger logger = new AmbientFileLogger(null, null, 8 * 60))
{
logFilePrefix = logger.FilePrefix;
// delete any preexisting files
await AmbientFileLogger.TryDeleteAllFiles(logFilePrefix);
using (IDisposable over = Logger.ScopedLocalOverride(logger))
{
// log the first test message (this will cause the file to be created, but only *after* this message gets flushed
Logger.Local?.Log("test1");
Assert.AreEqual(0, TempFileCount(logFilePrefix));
if (Logger.Local != null)
{
await Logger.Local.Flush();
}
Assert.AreEqual(1, TempFileCount(logFilePrefix));
// get the name of the first log file
string firstLogFile = logger.GetLogFileName(AmbientClock.UtcNow);
// skip ahead eight hours and flush another message (it should go in another file)
AmbientClock.SkipAhead(TimeSpan.FromHours(8));
// log the second test message
Logger.Local?.Log("test2");
if (Logger.Local != null)
{
await Logger.Local.Flush();
}
Assert.AreEqual(2, TempFileCount(logFilePrefix));
// skip ahead eight hours and flush another message (it should go in another file)
AmbientClock.SkipAhead(TimeSpan.FromHours(8));
// log the third test message
Logger.Local?.Log("test3");
if (Logger.Local != null)
{
await Logger.Local.Flush();
}
Assert.AreEqual(3, TempFileCount(logFilePrefix));
// skip ahead eight hours and flush another message (this should rotate around to the first file)
AmbientClock.SkipAhead(TimeSpan.FromHours(8));
// log the fourth test message
Logger.Local?.Log("test4");
if (Logger.Local != null)
{
await Logger.Local.Flush();
}
Assert.AreEqual(3, TempFileCount(logFilePrefix));
// skip ahead eight hours and flush another message (this should rotate around to the second file)
AmbientClock.SkipAhead(TimeSpan.FromHours(8));
// log a fifth test message just to make sure the first file gets closed
Logger.Local?.Log("test5");
if (Logger.Local != null)
{
await Logger.Local.Flush();
}
Assert.AreEqual(3, TempFileCount(logFilePrefix));
// open the first log file
string firstLogContents = File.ReadAllText(firstLogFile);
Assert.IsFalse(firstLogContents.Contains("test1")); // the first log message should have been overwritten when the log rotated around to the first file again
Assert.IsTrue(firstLogContents.Contains("test4"));
// try to delete files here (this will cause an ignored exception)
await AmbientFileLogger.TryDeleteAllFiles(logFilePrefix);
}
// dispose a little early so we can test flushing after disposal
logger.Dispose();
await logger.Flush(); // this should just be ignored after disposal
}
}
finally
{
await AmbientFileLogger.TryDeleteAllFiles(logFilePrefix !);
}
}
