cs-codex-dist-tests/DistTestCore/FileManager.cs

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2023-04-12 14:06:04 +00:00
using Logging;
using NUnit.Framework;
namespace DistTestCore
{
public interface IFileManager
{
TestFile CreateEmptyTestFile();
TestFile GenerateTestFile(ByteSize size);
void DeleteAllTestFiles();
}
public class FileManager : IFileManager
{
public const int ChunkSize = 1024 * 1024;
private readonly Random random = new Random();
private readonly TestLog log;
private readonly string folder;
public FileManager(TestLog log, Configuration configuration)
{
folder = configuration.GetFileManagerFolder();
EnsureDirectory();
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this.log = log;
}
public TestFile CreateEmptyTestFile()
{
var result = new TestFile(Path.Combine(folder, Guid.NewGuid().ToString() + "_test.bin"));
File.Create(result.Filename).Close();
return result;
}
public TestFile GenerateTestFile(ByteSize size)
{
var result = CreateEmptyTestFile();
GenerateFileBytes(result, size);
log.Log($"Generated {size.SizeInBytes} bytes of content for file '{result.Filename}'.");
return result;
}
public void DeleteAllTestFiles()
{
DeleteDirectory();
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}
private void GenerateFileBytes(TestFile result, ByteSize size)
{
long bytesLeft = size.SizeInBytes;
while (bytesLeft > 0)
{
var length = Math.Min(bytesLeft, ChunkSize);
AppendRandomBytesToFile(result, length);
bytesLeft -= length;
}
}
private void AppendRandomBytesToFile(TestFile result, long length)
{
var bytes = new byte[length];
random.NextBytes(bytes);
using var stream = new FileStream(result.Filename, FileMode.Append);
stream.Write(bytes, 0, bytes.Length);
}
private void EnsureDirectory()
{
if (!Directory.Exists(folder)) Directory.CreateDirectory(folder);
}
private void DeleteDirectory()
{
Directory.Delete(folder, true);
}
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}
public class TestFile
{
public TestFile(string filename)
{
Filename = filename;
}
public string Filename { get; }
public long GetFileSize()
{
var info = new FileInfo(Filename);
return info.Length;
}
public void AssertIsEqual(TestFile? actual)
{
if (actual == null) Assert.Fail("TestFile is null.");
if (actual == this || actual!.Filename == Filename) Assert.Fail("TestFile is compared to itself.");
Assert.That(actual.GetFileSize(), Is.EqualTo(GetFileSize()), "Files are not of equal length.");
using var streamExpected = new FileStream(Filename, FileMode.Open, FileAccess.Read);
using var streamActual = new FileStream(actual.Filename, FileMode.Open, FileAccess.Read);
var bytesExpected = new byte[FileManager.ChunkSize];
var bytesActual = new byte[FileManager.ChunkSize];
var readExpected = 0;
var readActual = 0;
while (true)
{
readExpected = streamExpected.Read(bytesExpected, 0, FileManager.ChunkSize);
readActual = streamActual.Read(bytesActual, 0, FileManager.ChunkSize);
if (readExpected == 0 && readActual == 0) return;
Assert.That(readActual, Is.EqualTo(readExpected), "Unable to read buffers of equal length.");
CollectionAssert.AreEqual(bytesExpected, bytesActual, "Files are not binary-equal.");
}
}
}
}