public async void ShouldThrowIOExceptionWhenReadAsyncIsFaulted()
{
var reader = new ChunkReader(AsyncTestStream.CreateFailingStream(new IOException("some error")));
var ex = await Record.ExceptionAsync(() => reader.ReadNextMessagesAsync(new MemoryStream()));
ex.Should().NotBeNull();
ex.Should().BeAssignableTo <IOException>().Which.Message.Should().Be("some error");
}
public async void ShouldThrowIOExceptionWhenReadAsyncReturnsZeroOrLess(int returnValue)
{
var reader = new ChunkReader(AsyncTestStream.CreateStream(Task.FromResult(returnValue)));
var ex = await Record.ExceptionAsync(() => reader.ReadNextMessagesAsync(new MemoryStream()));
ex.Should().NotBeNull();
ex.Should().BeAssignableTo <IOException>().Which.Message.Should().StartWith("Unexpected end of stream, read returned");
}
private static async Task <byte[]> ConstructMessage(byte[] buffer)
{
var stream = new MemoryStream();
var reader = new ChunkReader(new MemoryStream(buffer));
await reader.ReadNextMessagesAsync(stream);
return(stream.ToArray());
}
public async void ShouldThrowCancellationWhenReadAsyncIsCancelled()
{
var reader = new ChunkReader(AsyncTestStream.CreateCancellingStream());
var ex = await Record.ExceptionAsync(() => reader.ReadNextMessagesAsync(new MemoryStream()));
ex.Should().NotBeNull();
ex.Should().BeAssignableTo <OperationCanceledException>();
}
private static byte[] ConstructMessage(byte[] buffer)
{
var stream = new MemoryStream();
var reader = new ChunkReader(new MemoryStream(buffer));
reader.ReadNextMessages(stream);
return(stream.ToArray());
}
public async void ShouldThrowWhenEndOfMessageMarkerNotPresentAsync(byte[] input)
{
var reader = new ChunkReader(new MemoryStream(input));
var targetStream = new MemoryStream();
var ex = await Record.ExceptionAsync(() => reader.ReadNextMessagesAsync(targetStream));
ex.Should().NotBeNull();
ex.Should().BeOfType <IOException>().Which.Message.Should().StartWith("Unexpected end of stream");
}
public void ShouldThrowWhenEndOfStreamIsDetected(byte[] input)
{
var reader = new ChunkReader(new MemoryStream(input));
var targetStream = new MemoryStream();
var ex = Record.Exception(() => reader.ReadNextMessages(targetStream));
ex.Should().NotBeNull();
ex.Should().BeOfType <IOException>().Which.Message.Should().StartWith("Unexpected end of stream");
}
public void ShouldReadMessageSpanningMultipleChunks(byte[] input, byte[] expectedMessageBuffers, int expectedCount)
{
var reader = new ChunkReader(new MemoryStream(input));
var targetStream = new MemoryStream();
var count = reader.ReadNextMessages(targetStream);
var messageBuffers = targetStream.ToArray();
count.Should().Be(expectedCount);
messageBuffers.Should().Equal(expectedMessageBuffers);
}
public async void ShouldResetInternalBufferPositionsWhenWritableBufferIsSmallerThanSetWatermarkAsync()
{
var input = GenerateMessageChunk(Constants.ChunkBufferSize - Constants.ChunkBufferResetPositionsWatermark);
var logger = LoggingHelper.GetTraceEnabledLogger();
var reader = new ChunkReader(new MemoryStream(input), logger.Object);
var count = await reader.ReadNextMessagesAsync(new MemoryStream());
count.Should().Be(1);
logger.Verify(l => l.Trace(It.IsRegex(CompactingArgumentRegEx), It.IsAny <object[]>()), Times.Once);
}
public void ShouldResetInternalBufferPositionsWhenAMessageOfNChunks()
{
var size = 3 * Constants.MaxChunkSize;
var input = GenerateMessageChunk(3 * Constants.MaxChunkSize);
var logger = LoggingHelper.GetTraceEnabledLogger();
var reader = new ChunkReader(new MemoryStream(input), logger.Object);
var count = reader.ReadNextMessages(new MemoryStream());
count.Should().Be(1);
logger.Verify(l => l.Trace(It.IsRegex(CompactingArgumentRegEx), It.IsAny <object[]>()), Times.AtLeast(size / Constants.ChunkBufferSize));
}
public async void ShouldReadSingleMessageStreamLargerThanBufferSizeAsync()
{
const int chunkSize = 22 * 1024;
const int totalStreamSizeByte = 2 * chunkSize;
var inputStream = new MemoryStream(GenerateMessages(chunkSize, totalStreamSizeByte)); // Will create a message of two 11k chunks, these will straddle the 16k internal buffer size...
var resultStream = new MemoryStream();
var reader = new ChunkReader(inputStream);
var count = await reader.ReadNextMessagesAsync(resultStream);
count.Should().Be(1);
}
public async void ShouldReadNoopsBetweenMessagesAsync(byte[] input, byte[] expectedMessageBuffers, int expectedCount)
{
var reader = new ChunkReader(new MemoryStream(input));
var targetStream = new MemoryStream();
var count = await reader.ReadNextMessagesAsync(targetStream);
var messageBuffers = targetStream.ToArray();
count.Should().Be(expectedCount);
messageBuffers.Should().Equal(expectedMessageBuffers);
}
public async void ShouldResetInternalBufferPositionsWhenWritableBufferIsSmallerThanSetWatermarkWithConsecutiveMessagesAsync()
{
const int messageSizePerChunk = 1000;
const int maxBytes = Constants.ChunkBufferSize;
var input = GenerateMessages(messageSizePerChunk, maxBytes);
var logger = LoggingHelper.GetTraceEnabledLogger();
var reader = new ChunkReader(new MemoryStream(input), logger.Object);
var count = await reader.ReadNextMessagesAsync(new MemoryStream());
count.Should().BeGreaterOrEqualTo(maxBytes / messageSizePerChunk);
logger.Verify(l => l.Trace(It.IsRegex(CompactingArgumentRegEx), It.IsAny <object[]>()), Times.Once);
}
public async void ShouldResetBufferStreamPositionAsync()
{
var data = GenerateMessages(1000, 128 * 1024);
var logger = new Mock <ILogger>();
var reader = new ChunkReader(new MemoryStream(data.ToArray()), logger.Object);
var bufferStream = new MemoryStream();
bufferStream.Write(GenerateMessageChunk(1035));
var bufferPosition = bufferStream.Position;
var count = await reader.ReadNextMessagesAsync(bufferStream);
bufferStream.Position.Should().Be(bufferPosition);
}
public async void ShouldReadMultipleMessageStreamLargerThanBufferSizeAsync()
{
const int chunkSize = 11 * 1024;
const int totalStreamSizeByte = 2 * chunkSize;
var inputStream = new MemoryStream();
inputStream.Write(GenerateMessages(chunkSize, totalStreamSizeByte)); //Add a message made of two 11k chunks.
inputStream.Write(GenerateMessages(chunkSize, totalStreamSizeByte)); //Add another message made of two 11k chunks.
inputStream.Position = 0;
var resultStream = new MemoryStream();
var reader = new ChunkReader(inputStream);
var count = await reader.ReadNextMessagesAsync(resultStream);
count.Should().Be(2);
}