public FileAstronaut(string path, long?fileSizeLimitBytes, Encoding encoding = null, bool buffered = false)
{
if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException(nameof(path));
}
if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0)
{
throw new ArgumentException("Negative value provided; file size limit must be non-negative.");
}
_fileSizeLimitBytes = fileSizeLimitBytes;
_buffered = buffered;
var directory = Path.GetDirectoryName(path);
if (!string.IsNullOrWhiteSpace(directory) && !Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
Stream output = _underlyingStream = System.IO.File.Open(path, FileMode.Append, FileAccess.Write, FileShare.Read);
if (fileSizeLimitBytes != null)
{
output = _sizeLimitedStream = new SizeLimitedStream(_underlyingStream);
}
_output = new StreamWriter(output, encoding ?? new UTF8Encoding(encoderShouldEmitUTF8Identifier: false));
}
public void Ctor_NullInnerStream_Throws()
{
// Arrange
Stream innerStream = null;
// Act + Assert
Assert.Throws <ArgumentNullException>(() =>
{
using var sizeLimitedStream = new SizeLimitedStream(innerStream, 1);
});
}
public void BeginRead_InnerStreamExceedsSizeLimit_Throws(bool exceedsLimit)
{
// Arrange
var sizeLimit = 10;
var bytes = new byte[sizeLimit + (exceedsLimit ? 1 : 0)];
using var innerStream = new MemoryStream(bytes);
using var sizeLimitedStream = new SizeLimitedStream(innerStream, sizeLimit);
var buffer = new byte[bytes.Length];
// Act
var exception = Record.Exception(() =>
{
var asyncResult = sizeLimitedStream.BeginRead(buffer, 0, buffer.Length, (o) => { }, null);
sizeLimitedStream.EndRead(asyncResult);
});
// Assert
AssertStreamReadingException(exception, exceedsLimit);
}
public void Read_InnerStreamExceedsSizeLimit_Throws(bool exceedsLimit)
{
// Arrange
var sizeLimit = 10;
var bytes = new byte[sizeLimit + (exceedsLimit ? 1 : 0)];
using var innerStream = new MemoryStream(bytes);
using var sizeLimitedStream = new SizeLimitedStream(innerStream, sizeLimit);
var buffer = new byte[bytes.Length];
// Act
var exception = Record.Exception(() =>
{
while (sizeLimitedStream.Read(buffer, 0, buffer.Length) > 0)
{
}
});
// Assert
AssertStreamReadingException(exception, exceedsLimit);
}
public async Task ReadAsync_InnerStreamExceedsSizeLimit_Throws(bool exceedsLimit)
{
// Arrange
var sizeLimit = 10;
var bytes = new byte[sizeLimit + (exceedsLimit ? 1 : 0)];
using var innerStream = new MemoryStream(bytes);
using var sizeLimitedStream = new SizeLimitedStream(innerStream, sizeLimit);
var buffer = new byte[bytes.Length];
// Act
var exception = await Record.ExceptionAsync(async() =>
{
while (await sizeLimitedStream.ReadAsync(buffer) > 0)
{
}
});
// Assert
AssertStreamReadingException(exception, exceedsLimit);
}