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1205 lines (1050 loc) · 45.5 KB
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using Downloader.Exceptions;
using Downloader.Extensions;
namespace Downloader.Test.IntegrationTests;
[Collection("Sequential")]
public abstract class DownloadIntegrationTest : BaseTestClass, IDisposable
{
private byte[] FileData { get; set; }
private string Url { get; set; }
private int FileSize { get; set; }
private string Filename { get; set; }
private string FilePath { get; set; }
protected DownloadConfiguration Config { get; init; }
protected DownloadService Downloader { get; init; }
protected DownloadIntegrationTest(ITestOutputHelper output) : base(output)
{
Filename = Path.GetRandomFileName();
FilePath = Path.Combine(Path.GetTempPath(), Filename);
FileSize = DummyFileHelper.FileSize16Kb;
FileData = DummyFileHelper.File16Kb;
Url = DummyFileHelper.GetFileWithNameUrl(Filename, FileSize);
}
public void Dispose()
{
if (File.Exists(FilePath))
File.Delete(FilePath);
}
protected void DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
{
if (e.Error is not null)
{
Output.WriteLine("Error when completed: " + e.Error.Message);
}
}
[Fact]
public async Task DownloadUrlWithFilenameOnMemoryTest()
{
// arrange
bool downloadCompletedSuccessfully = false;
string resultMessage = "";
Downloader.DownloadFileCompleted += (_, e) => {
if (e.Cancelled == false && e.Error == null)
{
downloadCompletedSuccessfully = true;
}
else
{
resultMessage = e.Error?.Message;
}
};
// act
await using Stream memoryStream = await Downloader.DownloadFileTaskAsync(Url);
// assert
Assert.True(downloadCompletedSuccessfully, resultMessage);
Assert.NotNull(memoryStream);
Assert.True(Downloader.Package.IsSaveComplete);
Assert.Null(Downloader.Package.FileName);
Assert.Equal(FileSize, memoryStream.Length);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
Assert.True(FileData.AreEqual(memoryStream));
}
[Fact]
public async Task DownloadAndReadFileOnDownloadFileCompletedEventTest()
{
// arrange
string destFilename = FilePath;
byte[] downloadedBytes = null;
bool downloadCompletedSuccessfully = false;
Downloader.DownloadFileCompleted += (_, e) => {
if (!e.Cancelled && e.Error is null)
{
// Execute the downloaded file within completed event
// Note: Execute within this event caused to an IOException:
// The process cannot access the file '...\Temp\tmp14D3.tmp'
// because it is being used by another process.
downloadCompletedSuccessfully = true;
downloadedBytes = File.ReadAllBytes(destFilename);
}
};
// act
await Downloader.DownloadFileTaskAsync(Url, destFilename);
// assert
Assert.True(downloadCompletedSuccessfully);
Assert.NotNull(downloadedBytes);
Assert.Equal(destFilename, Downloader.Package.FileName);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, downloadedBytes.Length);
Assert.Equal(FileData.Length, downloadedBytes.Length);
Assert.True(FileData.SequenceEqual(downloadedBytes));
File.Delete(destFilename);
}
[Fact]
public async Task Download16KbWithoutFilenameOnDirectoryTest()
{
// arrange
DirectoryInfo dir = new(Path.GetTempPath());
// act
await Downloader.DownloadFileTaskAsync(Url, dir);
// assert
Assert.True(Downloader.Package.IsSaveComplete);
Assert.True(File.Exists(Downloader.Package.FileName));
Assert.NotNull(Downloader.Package.FileName);
Assert.StartsWith(DummyFileHelper.TempDirectory, Downloader.Package.FileName);
Assert.Equal(FilePath, Downloader.Package.FileName);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.True(FileData.AreEqual(File.OpenRead(Downloader.Package.FileName)));
File.Delete(FilePath);
}
[Fact]
public async Task Download16KbWithFilenameTest()
{
// act
await Downloader.DownloadFileTaskAsync(Url, FilePath);
// assert
Assert.True(File.Exists(Downloader.Package.FileName));
Assert.NotNull(Downloader.Package.FileName);
Assert.StartsWith(DummyFileHelper.TempDirectory, Downloader.Package.FileName);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.True(FileData.AreEqual(File.OpenRead(Downloader.Package.FileName)));
File.Delete(Downloader.Package.FileName);
}
[Fact(Timeout = 20_000)]
public async Task Download1KbWhenAnotherBiggerFileExistTest()
{
// arrange
string url1KbFile = DummyFileHelper.GetFileUrl(DummyFileHelper.FileSize1Kb);
FileInfo file = new(GetTempNoFilename());
// act
// write file bigger than download file
await File.WriteAllBytesAsync(file.FullName, DummyData.GenerateSingleBytes(2048, 250));
if (File.Exists(file.FullName))
{
// override file with downloader
await Downloader.DownloadFileTaskAsync(url1KbFile, file.FullName);
}
// assert
Assert.True(File.Exists(file.FullName));
Assert.Equal(file.FullName, Downloader.Package.FileName);
Assert.Equal(DummyFileHelper.FileSize1Kb, Downloader.Package.TotalFileSize);
Assert.Equal(DummyFileHelper.FileSize1Kb, file.Length);
Assert.True(DummyFileHelper.File1Kb.AreEqual(file.OpenRead()));
file.Delete();
}
[Fact]
public async Task Download16KbOnMemoryTest()
{
// act
Stream fileBytes = await Downloader.DownloadFileTaskAsync(Url);
// assert
Assert.Equal(expected: FileSize, actual: Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, fileBytes.Length);
Assert.True(FileData.AreEqual(fileBytes));
}
[Fact]
public async Task DownloadProgressChangedTest()
{
// arrange
int progressChangedCount = (int)Math.Ceiling((double)FileSize / Config.BufferBlockSize);
int progressCounter = 0;
Downloader.DownloadProgressChanged += (_, _) => Interlocked.Increment(ref progressCounter);
// act
await Downloader.DownloadFileTaskAsync(Url);
// assert
// Note: sometimes received bytes on read stream method was less than block size!
Assert.True(progressChangedCount <= progressCounter);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
Assert.True(Downloader.Package.IsSaveComplete);
Assert.False(Downloader.Package.IsSaving);
}
[Fact]
public async Task StopResumeDownloadTest()
{
// arrange
int expectedStopCount = 2;
int stopCount = 0;
int cancellationsOccurrenceCount = 0;
int downloadFileExecutionCounter = 0;
bool downloadCompletedSuccessfully = false;
Downloader.DownloadFileCompleted += (_, e) => {
if (e.Cancelled)
{
cancellationsOccurrenceCount++;
}
else
{
downloadCompletedSuccessfully = true;
}
};
Downloader.DownloadStarted += async delegate {
if (expectedStopCount > stopCount)
{
// Stopping after start of downloading
await Downloader.CancelTaskAsync();
stopCount++;
}
};
// act
await Downloader.DownloadFileTaskAsync(Url, GetTempNoFilename());
while (expectedStopCount > downloadFileExecutionCounter++)
{
// resume download from stopped point.
await Downloader.DownloadFileTaskAsync(Downloader.Package);
}
byte[] stream = await File.ReadAllBytesAsync(Downloader.Package.FileName);
// assert
Assert.True(File.Exists(Downloader.Package.FileName));
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(expectedStopCount, stopCount);
Assert.Equal(expectedStopCount, cancellationsOccurrenceCount);
Assert.True(downloadCompletedSuccessfully);
Assert.Equal(FileData.Length, stream.Length);
Assert.True(FileData.SequenceEqual(stream.ToArray()));
File.Delete(Downloader.Package.FileName);
}
[Fact]
public async Task PauseResumeDownloadTest()
{
// arrange
int expectedPauseCount = 2;
int pauseCount = 0;
bool downloadCompletedSuccessfully = false;
Downloader.DownloadFileCompleted += (_, e) => {
if (e.Cancelled == false && e.Error is null)
downloadCompletedSuccessfully = true;
};
Downloader.DownloadProgressChanged += delegate {
if (expectedPauseCount > pauseCount)
{
// Stopping after start of downloading
Downloader.Pause();
pauseCount++; // Because of concurrency may be pauseCount > expectedPauseCount
Downloader.Resume();
}
};
// act
await Downloader.DownloadFileTaskAsync(Url, GetTempNoFilename());
byte[] stream = await File.ReadAllBytesAsync(Downloader.Package.FileName);
// assert
Assert.False(Downloader.IsPaused);
Assert.True(File.Exists(Downloader.Package.FileName));
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.True(downloadCompletedSuccessfully);
Assert.True(FileData.SequenceEqual(stream.ToArray()));
File.Delete(Downloader.Package.FileName);
}
[Fact]
public async Task StopResumeDownloadFromLastPositionTest()
{
// arrange
int expectedStopCount = 1;
int stopCount = 0;
int downloadFileExecutionCounter = 0;
long totalProgressedByteSize = 0L;
long totalReceivedBytes = 0L;
Config.BufferBlockSize = 1024;
Config.EnableLiveStreaming = true;
Downloader.DownloadProgressChanged += (_, e) => {
Interlocked.Add(ref totalProgressedByteSize, e.ProgressedByteSize);
Interlocked.Add(ref totalReceivedBytes, e.ReceivedBytes.Length);
if (expectedStopCount > stopCount)
{
// Stopping after start of downloading
Downloader.CancelAsync();
Interlocked.Increment(ref stopCount);
}
};
// act
await Downloader.DownloadFileTaskAsync(Url);
while (expectedStopCount > downloadFileExecutionCounter++)
{
// resume download from stopped point.
await Downloader.DownloadFileTaskAsync(Downloader.Package);
}
// assert
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, totalReceivedBytes);
Assert.Equal(FileSize, totalProgressedByteSize);
}
[Fact]
public async Task StopResumeDownloadOverFirstPackagePositionTest()
{
// arrange
int cancellationCount = 4;
bool isSavingStateBeforeCancel = false;
Config.EnableLiveStreaming = true;
Downloader.DownloadProgressChanged += async (_, _) => {
isSavingStateBeforeCancel |= Downloader.Package.IsSaving;
// Interlocked: progress events fire concurrently across parallel chunks, so a plain
// --count races and can leak an extra cancel into the attempt meant to complete.
// Once the counter is exhausted no attempt is cancelled, so a resume runs to the end.
if (Interlocked.Decrement(ref cancellationCount) > 0)
{
// Stopping after start of downloading
await Downloader.CancelTaskAsync();
10BC8
}
};
// act
Stream result = await Downloader.DownloadFileTaskAsync(Url);
// check point of package for once time
string firstCheckPointPackage = JsonConvert.SerializeObject(Downloader.Package);
while (Downloader.IsCancelled)
{
DownloadPackage restoredPackage = JsonConvert.DeserializeObject<DownloadPackage>(firstCheckPointPackage);
// resume download from first stopped point.
result = await Downloader.DownloadFileTaskAsync(restoredPackage);
}
// assert
Assert.True(Downloader.Package.IsSaveComplete);
Assert.False(Downloader.Package.IsSaving);
Assert.True(isSavingStateBeforeCancel);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, result.Length);
}
[Fact]
public async Task TestTotalReceivedBytesWhenResumeDownload()
{
// arrange
bool canStopDownload = true;
long totalDownloadSize = 0L;
double lastProgressPercentage = 0.0;
Config.BufferBlockSize = 1024;
Config.ChunkCount = 1;
Config.EnableLiveStreaming = true;
Downloader.DownloadProgressChanged += async (_, e) => {
totalDownloadSize += e.ReceivedBytes.Length;
lastProgressPercentage = e.ProgressPercentage;
if (canStopDownload && totalDownloadSize > FileSize / 2)
{
// Stopping after start of downloading
await Downloader.CancelTaskAsync();
canStopDownload = false;
}
};
// act
await Downloader.DownloadFileTaskAsync(Url);
await Downloader.DownloadFileTaskAsync(Downloader.Package); // resume download from stopped point.
// assert
Assert.True(Downloader.Package.IsSaveComplete);
Assert.False(Downloader.IsCancelled);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, totalDownloadSize);
Assert.Equal(100.0, lastProgressPercentage);
}
[Fact]
public async Task TestTotalReceivedBytesOnResumeDownloadWhenLostDownloadedData()
{
// arrange
bool canStopDownload = true;
long totalDownloadSize = 0L;
double lastProgressPercentage = 0.0;
Config.BufferBlockSize = 1024;
Config.ChunkCount = 1;
Downloader.DownloadProgressChanged += (_, e) => {
totalDownloadSize = e.ReceivedBytesSize;
lastProgressPercentage = e.ProgressPercentage;
if (canStopDownload && totalDownloadSize > FileSize / 2)
{
// Stopping after start of downloading
Downloader.CancelAsync();
canStopDownload = false;
}
};
// act
await Downloader.DownloadFileTaskAsync(Url);
await Downloader.Package.Storage.DisposeAsync(); // set position to zero
await Downloader.DownloadFileTaskAsync(Downloader.Package); // resume download from stopped point.
// assert
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, totalDownloadSize);
Assert.Equal(100.0, lastProgressPercentage);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
}
[Fact]
public async Task SpeedLimitTest()
{
// arrange
double averageSpeed = 0;
const double tolerance = 2;
const int speed = 1024 * 1024; // 1MB/s
const int fileSize = 1024 * 1024 * 10; // 10MB
string url = DummyFileHelper.GetFileWithNameUrl(Filename, fileSize);
Config.BufferBlockSize = 1024; // 1KB
Config.MaximumBytesPerSecond = speed;
Downloader.DownloadProgressChanged += (_, e) => {
averageSpeed = e.AverageBytesPerSecondSpeed;
};
// act
await Downloader.DownloadFileTaskAsync(url);
// assert
Assert.Equal(fileSize, Downloader.Package.TotalFileSize);
Assert.Equal(speed, Config.MaximumBytesPerSecond);
Assert.True(averageSpeed <= Config.MaximumBytesPerSecond * tolerance,
$"Average Speed: {averageSpeed} , Speed Limit: {speed}");
}
[Fact]
public async Task DynamicSpeedLimitTest()
{
// arrange
const long size = 1024 * 256; // 256KB
const int speedUpLevels = 4; // 4 levels
const int levelPercent = 100 / speedUpLevels; // 20% each level
const double tolerance = 2; // 200% of expected avg speed
const int speedPerStep = 8192; // 8KB/s
const double sumLevelsSectors = speedUpLevels * (speedUpLevels + 1) / 2d; // n*(n+1)/2
const double expectedAverageSpeed = speedPerStep * sumLevelsSectors / speedUpLevels;
int currentLevel = 1;
long averageSpeed = 0;
object lockObj = new();
string url = DummyFileHelper.GetFileWithNameUrl(Filename, size);
Config.BufferBlockSize = 1024;
Config.MaximumBytesPerSecond = speedPerStep;
Downloader.DownloadProgressChanged += (_, e) => {
averageSpeed = (long)e.AverageBytesPerSecondSpeed;
lock (lockObj)
{
if (currentLevel <= speedUpLevels &&
(int)e.ProgressPercentage / (levelPercent * currentLevel) > 1)
{
currentLevel++;
// increase speed each 25% of progress: 25%, 50%, 75%, 100%
Config.MaximumBytesPerSecond += speedPerStep;
}
}
};
// act
await Downloader.DownloadFileTaskAsync(url);
// assert
Assert.Equal(size, Downloader.Package.TotalFileSize);
Assert.True(averageSpeed <= expectedAverageSpeed * tolerance,
$"Avg Speed: {averageSpeed} , Expected Avg Speed Limit: {expectedAverageSpeed} * {tolerance}, ");
}
[Fact]
public async Task TestSizeWhenDownloadOnMemoryStream()
{
// arrange
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
// assert
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, stream.Length);
}
[Fact]
public async Task TestTypeWhenDownloadOnMemoryStream()
{
// arrange
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
// assert
Assert.True(stream is MemoryStream);
}
[Fact]
public async Task TestContentWhenDownloadOnMemoryStream()
{
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
byte[] data = (stream as MemoryStream)?.ToArray();
// assert
Assert.NotNull(data);
Assert.Equal(FileData.Length, data.Length);
Assert.True(FileData.SequenceEqual(data));
}
[Fact(Timeout = 60_000)]
public async Task Download256BytesRangeOfFileTest()
{
// arrange
Config.RangeDownload = true;
Config.RangeLow = 256;
Config.RangeHigh = 511;
long totalSize = Config.RangeHigh - Config.RangeLow + 1;
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
// assert
Assert.NotNull(stream);
Assert.Equal(totalSize, stream.Length);
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
Assert.IsType<MemoryStream>(stream);
byte[] bytes = ((MemoryStream)stream).ToArray();
for (int i = 0; i < totalSize; i++)
Assert.Equal((byte)i, bytes[i]);
}
[Fact]
public async Task DownloadNegativeRangeOfFileTest()
{
// arrange
Config.RangeDownload = true;
Config.RangeLow = -256;
Config.RangeHigh = 255;
int totalSize = 256;
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
byte[] bytes = ((MemoryStream)stream).ToArray();
// assert
Assert.NotNull(stream);
Assert.Equal(totalSize, stream.Length);
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
for (int i = 0; i < totalSize; i++)
Assert.Equal((byte)i, bytes[i]);
}
[Fact]
public async Task TestDownloadParallelVsHalfOfChunks()
{
// arrange
int maxParallelCountTasks = Config.ChunkCount / 2;
Config.ParallelCount = maxParallelCountTasks;
int actualMaxParallelCountTasks = 0;
Downloader.ChunkDownloadProgressChanged += (_, e) => {
actualMaxParallelCountTasks = Math.Max(actualMaxParallelCountTasks, e.ActiveChunks);
};
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(Url);
byte[] bytes = ((MemoryStream)stream).ToArray();
// assert
Assert.True(maxParallelCountTasks >= actualMaxParallelCountTasks);
Assert.NotNull(stream);
Assert.Equal(FileSize, stream.Length);
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
for (int i = 0; i < FileSize; i++)
Assert.Equal((byte)i, bytes[i]);
}
[Fact(Timeout = 30_000)]
public async Task TestResumeImmediatelyAfterCanceling()
{
// arrange
bool canStopDownload = true;
double lastProgressPercentage = 0d;
bool? stopped = null;
SemaphoreSlim semaphoreSlim = new(1, 1);
TaskCompletionSource<bool> cancellationCompleted = new();
Downloader.DownloadFileCompleted += (_, e) => {
stopped ??= e.Cancelled;
if (stopped == true)
cancellationCompleted.TrySetResult(true);
};
Downloader.DownloadProgressChanged += async (_, e) => {
if (canStopDownload && e.ProgressPercentage > 50)
{
try
{
await semaphoreSlim.WaitAsync();
if (canStopDownload)
{
canStopDownload = false;
lastProgressPercentage = e.ProgressPercentage;
await Downloader.CancelTaskAsync();
}
}
finally
{
semaphoreSlim.Release();
}
}
};
// act
await Downloader.DownloadFileTaskAsync(Url);
await cancellationCompleted.Task; // Wait for cancellation to complete
await using Stream stream = await Downloader.DownloadFileTaskAsync(Downloader.Package); // resume
// assert
Assert.True(stopped);
Assert.True(lastProgressPercentage > 50);
Assert.True(Downloader.Package.IsSaveComplete);
Assert.False(Downloader.IsCancelled);
}
[Theory]
[InlineData(true)] // Remove File When Download Failed Test
[InlineData(false)] // Keep File When Download Failed Test
public async Task KeepOrRemoveFileWhenDownloadFailedTest(bool clearFileAfterFailure)
{
// arrange
Config.MaxTryAgainOnFailure = 0;
Config.ClearPackageOnCompletionWithFailure = clearFileAfterFailure;
Config.DownloadFileExtension = "test";
DownloadService downloadService = new(Config);
string url = DummyFileHelper.GetFileWithFailureAfterOffset(FileSize, FileSize / 2);
// act
await downloadService.DownloadFileTaskAsync(url, FilePath);
await Task.Delay(1000);
// assert
Assert.Equal(FilePath, downloadService.Package.FileName);
Assert.False(downloadService.Package.IsSaveComplete);
Assert.False(downloadService.Package.IsSaving);
Assert.NotEqual(clearFileAfterFailure, File.Exists(downloadService.Package.DownloadingFileName));
}
[Theory]
[InlineData(true)] // Test Retry Download After Timeout
[InlineData(false)] // Test Retry Download After Failure
public async Task TestRetryDownloadAfterFailure(bool timeout)
{
// arrange
Exception error = null;
int fileSize = FileSize;
int failureOffset = fileSize / 2;
Config.MaxTryAgainOnFailure = 5;
Config.BufferBlockSize = 1024;
Config.MinimumSizeOfChunking = 0;
Config.BlockTimeout = 1000;
Config.ClearPackageOnCompletionWithFailure = false;
DownloadService downloadService = new(Config);
TaskCompletionSource<bool> tcs = new(TaskCreationOptions.RunContinuationsAsynchronously);
string url = timeout
? DummyFileHelper.GetFileWithTimeoutAfterOffset(fileSize, failureOffset)
: DummyFileHelper.GetFileWithFailureAfterOffset(fileSize, failureOffset);
downloadService.DownloadFileCompleted += (_, e) => {
error ??= e.Error;
tcs.TrySetResult(true);
};
// act
Stream stream = await downloadService.DownloadFileTaskAsync(url);
await tcs.Task; // Wait for completion event
int retryCount = downloadService.Package.Chunks.Sum(chunk => chunk.FailureCount);
// assert
Assert.False(downloadService.Package.IsSaveComplete);
Assert.False(downloadService.Package.IsSaving);
Assert.Equal(DownloadStatus.Failed, downloadService.Package.Status);
Assert.IsType<HttpRequestException>(error);
Assert.True(((HttpRequestException)error).IsMomentumError());
Assert.True(Config.MaxTryAgainOnFailure <= retryCount,
$"Retry download count: {retryCount} > {Config.MaxTryAgainOnFailure}");
Assert.NotNull(error);
Assert.Equal(failureOffset, stream.Length);
await stream.DisposeAsync();
}
[Fact]
public async Task DownloadMultipleFilesWithOneDownloaderInstanceTest()
{
// arrange
int size1 = 1024 * 8;
int size2 = 1024 * 16;
int size3 = 1024 * 32;
int size4 = 1024 * 64;
string url1 = DummyFileHelper.GetFileUrl(size1);
string url2 = DummyFileHelper.GetFileUrl(size2);
string url3 = DummyFileHelper.GetFileUrl(size3);
string url4 = DummyFileHelper.GetFileUrl(size4);
// act
Stream file1 = await Downloader.DownloadFileTaskAsync(url1);
Stream file2 = await Downloader.DownloadFileTaskAsync(url2);
Stream file3 = await Downloader.DownloadFileTaskAsync(url3);
Stream file4 = await Downloader.DownloadFileTaskAsync(url4);
// assert
Assert.Equal(size1, file1.Length);
Assert.Equal(size2, file2.Length);
Assert.Equal(size3, file3.Length);
Assert.Equal(size4, file4.Length);
}
[Fact]
public async Task TestStopDownloadWithCancellationToken()
{
// arrange
double downloadProgress = 0d;
bool downloadCancelled = false;
CancellationTokenSource cts = new();
Downloader.DownloadFileCompleted += (_, e) => downloadCancelled = e.Cancelled;
Downloader.DownloadProgressChanged += (_, e) => {
// Use Math.Max to prevent concurrent lower-value events from overwriting the peak progress.
// Multiple chunks fire progress events simultaneously; a later event from a slower chunk
// can arrive with a lower percentage than an earlier event from a faster chunk.
downloadProgress = Math.Max(downloadProgress, e.ProgressPercentage);
if (e.ProgressPercentage > 10)
{
// Stopping after 10% progress of downloading
cts.Cancel();
}
};
// act
await Downloader.DownloadFileTaskAsync(Url, cts.Token);
// Introduce a delay to allow for some progress
await Task.Delay(500); // Adjust the delay time as needed
// assert
Assert.True(downloadCancelled);
Assert.True(Downloader.IsCancelled);
Assert.True(Downloader.Status == DownloadStatus.Stopped);
Assert.True(downloadProgress > 10);
}
[Fact(Timeout = 30_000)]
public async Task TestResumeDownloadWithAnotherUrl()
{
// arrange
string url1 = DummyFileHelper.GetFileWithNameUrl("file1.dat", FileSize);
string url2 = DummyFileHelper.GetFileWithNameUrl("file2.dat", FileSize);
bool canStopDownload = true;
long totalDownloadSize = 0L;
Config.BufferBlockSize = 1024;
Config.ChunkCount = 4;
Downloader.DownloadProgressChanged += (_, e) => {
totalDownloadSize = e.ReceivedBytesSize;
if (canStopDownload && totalDownloadSize > FileSize / 4)
{
// Stopping after start of downloading
Downloader.CancelAsync();
canStopDownload = false;
}
};
// act
await Downloader.DownloadFileTaskAsync(url1);
await Downloader.DownloadFileTaskAsync(Downloader.Package, url2); // resume download with new url2.
// assert
Assert.Equal(FileSize, Downloader.Package.TotalFileSize);
Assert.Equal(FileSize, totalDownloadSize);
Assert.Equal(Downloader.Package.Storage.Length, FileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
}
[Theory]
[InlineData(8, 2)] // Download A File From 8 Urls With 2 Chunks Test
[InlineData(2, 8)] // Download A File From 2 Urls With 8 Chunks Test
[InlineData(8, 8)] // Download A File From 8 Urls With 8 Chunks Test
public async Task DownloadAFileFromMultipleUrlsWithMultipleChunksTest(int urlsCount, int chunksCount)
{
// arrange
Config.ChunkCount = chunksCount;
Config.ParallelCount = chunksCount;
int totalSize = FileSize;
int chunkSize = totalSize / Config.ChunkCount;
string[] urls = Enumerable.Range(1, urlsCount)
.Select(i => DummyFileHelper.GetFileWithNameUrl("test-file_" + i, totalSize, (byte)i))
.ToArray();
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(urls);
byte[] bytes = ((MemoryStream)stream).ToArray();
// assert
Assert.NotNull(stream);
Assert.Equal(totalSize, stream.Length);
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
for (int i = 0; i < totalSize; i++)
{
byte chunkIndex = (byte)(i / chunkSize);
int expectedByte = (chunkIndex % urlsCount) + 1;
Assert.Equal(expectedByte, bytes[i]);
}
}
[Fact]
public async Task DownloadBigFileOnDisk()
{
// arrange
const int totalSize = 1024 * 1024 * 128; // 128MB
Config.ChunkCount = 8;
Config.ParallelCount = 8;
Config.MaximumBytesPerSecond = 0;
string url = DummyFileHelper.GetFileWithNameUrl(Filename, totalSize);
byte[] actualFile = DummyData.GenerateOrderedBytes(totalSize);
// act
await Downloader.DownloadFileTaskAsync(url, FilePath);
byte[] file = await File.ReadAllBytesAsync(FilePath);
// assert
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(totalSize, file.Length);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
Assert.True(file.SequenceEqual(actualFile));
File.Delete(FilePath);
}
[Fact]
public async Task DownloadBigFileOnMemory()
{
// arrange
int totalSize = 1024 * 1024 * 100; // 100MB
Config.ChunkCount = 8;
Config.ParallelCount = 8;
Config.MaximumBytesPerSecond = 0;
string url = DummyFileHelper.GetFileWithNameUrl(Filename, totalSize);
byte[] actualFile = DummyData.GenerateOrderedBytes(totalSize);
// act
await using Stream stream = await Downloader.DownloadFileTaskAsync(url);
// assert
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(totalSize, stream.Length);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
Assert.True(actualFile.AreEqual(stream));
}
[Fact]
public async Task DownloadBigFileWithMemoryLimitationOnDisk()
{
// arrange
int totalSize = 1024 * 1024 * 512; // 512MB
byte fillByte = 123;
Config.ChunkCount = 16;
Config.ParallelCount = 16;
Config.MaximumBytesPerSecond = 0;
Config.MaximumMemoryBufferBytes = 1024 * 1024 * 50; // 50MB
string url = DummyFileHelper.GetFileWithNameUrl(Filename, totalSize, fillByte);
//Downloader.AddLogger(FileLogger.Factory("D:\\TestDownload"));
// act
await Downloader.DownloadFileTaskAsync(url, FilePath);
await using FileStream fileStream = File.Open(FilePath, FileMode.Open, FileAccess.Read);
// assert
Assert.Equal(totalSize, Downloader.Package.TotalFileSize);
Assert.Equal(totalSize, fileStream.Length);
Assert.Equal(100.0, Downloader.Package.SaveProgress);
for (int i = 0; i < totalSize; i++)
{
Assert.Equal(fillByte, fileStream.ReadByte());
}
}
[Fact]
public async Task StorePackageFileWhenDownloadInProgress()
{
// arrange
const int totalSize = 1024 * 1024 * 32; // 32MB
double snapshotPoint = 0.25; // 25%
string url = DummyFileHelper.GetFileWithNameUrl(Filename, totalSize);
byte[] data = DummyData.GenerateOrderedBytes(totalSize);
byte[] buffer = new byte[totalSize];
string snapshot = "";
Exception error = null;
Config.ChunkCount = 8;
Config.ParallelCount = 8;
Config.BufferBlockSize = 1024;
Config.ClearPackageOnCompletionWithFailure = false;
DownloadService downloader = new(Config, LogFactory);
DownloadService resumeDownloader = new(Config, LogFactory);
resumeDownloader.DownloadFileCompleted += (_, args) => error = args.Error;
downloader.DownloadProgressChanged += async (_, e) => {
if (snapshotPoint >= e.ProgressPercentage)
return;
if (string.IsNullOrWhiteSpace(snapshot))
{
// First snapshot point
snapshotPoint += 0.25; // +25%
snapshot = JsonConvert.SerializeObject(downloader.Package);
Output.WriteLine($"snapshot on {snapshotPoint * 100}%");
}
else
{
// Second snapshot point
if (downloader.Status != DownloadStatus.Stopped)
{
Output.WriteLine($"Canceling download...");
await downloader.CancelTaskAsync(); // stop download
}
}
};
// act
Output.WriteLine("Starting download...");
await downloader.DownloadFileTaskAsync(url, FilePath);
// assert
Assert.False(string.IsNullOrWhiteSpace(snapshot));
await using DownloadPackage package = JsonConvert.DeserializeObject<DownloadPackage>(snapshot);
Assert.Equal(totalSize, package.TotalFileSize);
Assert.True(package.SaveProgress < 100);
Assert.True(package.SaveProgress > 0);
Output.WriteLine("Resuming download...");
await resumeDownloader.DownloadFileTaskAsync(package);
Assert.Null(package.Storage);
Assert.Null(error);
Assert.True(package.IsSaveComplete);
Output.WriteLine("Download completed.");
await using FileStream stream = File.OpenRead(FilePath);
int readBytes = await stream.ReadAsync(buffer.AsMemory());
Assert.Equal(totalSize, actual: stream.Length);
Assert.Equal(totalSize, readBytes);
// for (int i = 0; i < buffer.Length; i++)
// Assert.True(buffer[i] == data[i], $"buffer[{i}]: {buffer[i]} != data[{i}]: {data[i]}");
Assert.True(data.SequenceEqual(buffer));
// Clear
stream.Close();
File.Delete(FilePath);
}
[Fact]
public async Task TestDownloadFromRedirectedUrl()
{
// arrange
string url = DummyFileHelper.GetFileWithNameOnRedirectUrl(Filename, FileSize);
// act
await using Stream memoryStream = await Downloader.DownloadFileTaskAsync(url);
// assert
Assert.NotNull(memoryStream);
Assert.True(Downloader.Package.IsSaveComplete);
Assert.Null(Downloader.Package.FileName);
Assert.Equal(FileSize, memoryStream.Length);