internal static int GetMaxLength(LengthPrefixStyle lps, int length)
{
switch (lps)
{
case LengthPrefixStyle.Int8:
return(Math.Min(length, sbyte.MaxValue));
case LengthPrefixStyle.Int16:
return(Math.Min(length, short.MaxValue));
case LengthPrefixStyle.Int32:
case LengthPrefixStyle.Int64:
case LengthPrefixStyle.Varint:
return(Math.Min(length, int.MaxValue));
case LengthPrefixStyle.UInt8:
return(Math.Min(length, byte.MaxValue));
case LengthPrefixStyle.UInt16:
return(Math.Min(length, ushort.MaxValue));
case LengthPrefixStyle.UInt32:
case LengthPrefixStyle.UInt64:
case LengthPrefixStyle.UVarint:
return(Math.Min(length, int.MaxValue));
default:
throw new ArgumentOutOfRangeException(nameof(lps), lps, null);
}
}
public async Task TestReadWriteAsync(LengthPrefixStyle lps)
{
using (var mem = new MemoryStream())
using (var stream = new MessageStream(mem, true, lps))
{
await SubtestReadWriteAsync(stream, lps, () => stream?.Seek(0, SeekOrigin.Begin));
}
}
public void TestReadWrite(LengthPrefixStyle lps)
{
using (var mem = new MemoryStream())
using (var stream = new MessageStream(mem, true, lps))
{
SubtestReadWrite(stream, lps, () => stream?.Seek(0, SeekOrigin.Begin));
}
}
public MessageStream(Stream stream, bool leaveOpen = false, LengthPrefixStyle lps = LengthPrefixStyle.Varint,
Endianess endianess = Endianess.Big)
{
_stream = stream;
_leaveOpen = leaveOpen;
_reader = _stream.CanRead ? new MessageReader(_stream, leaveOpen, lps, endianess) : null;
_writer = _stream.CanWrite ? new MessageWriter(_stream, leaveOpen, lps, endianess) : null;
}
public MessageWriter(Stream stream, bool leaveOpen = false, LengthPrefixStyle lps = LengthPrefixStyle.Varint,
Endianess endianess = Endianess.Big)
{
_stream = stream;
_leaveOpen = leaveOpen;
_lps = lps;
_endianess = endianess;
_semaphore = new SemaphoreSlim(1, 1);
_codec = (_lps != LengthPrefixStyle.UVarint && _lps != LengthPrefixStyle.Varint) ? GetCodec() : null;
}
public void TestReadWriteRandomLengths(LengthPrefixStyle lps)
{
using (var stream = new MemoryStream())
{
using (var writer = new MessageWriter(stream, true, lps))
using (var reader = new MessageReader(stream, true, lps))
{
SubtestReadWriteRandomLengths(writer, reader, lps, () => stream?.Seek(0, SeekOrigin.Begin));
}
}
}
public async Task TestReadWriteMessageAsync(LengthPrefixStyle lps)
{
using (var stream = new MemoryStream())
{
using (var writer = new MessageWriter(stream, true, lps))
using (var reader = new MessageReader(stream, true, lps))
{
await SubtestReadWriteMessageAsync(writer, reader, lps, () => stream?.Seek(0, SeekOrigin.Begin));
}
}
}
public void TestReadWrite(LengthPrefixStyle lps)
{
using (var stream = new MemoryStream())
{
using (var writer = new MessageWriter(stream, true, lps))
using (var reader = new MessageReader(stream, true, lps))
{
SubtestReadWrite(writer, reader, lps, () =>
{
stream?.Flush();
stream?.ToArray();
stream?.Seek(0, SeekOrigin.Begin);
});
}
}
}
public void CombineStreamPair_TestReadWriteMessage(LengthPrefixStyle lps)
{
Stream a = null, b = null;
try
{
MakeTcpStreamPair(out a, out b);
using (var stream = MessageStream.Combine(new MessageReader(a, true, lps), new MessageWriter(b, true, lps)))
{
SubtestReadWriteMessage(stream, lps, () => {});
}
}
finally
{
a?.Dispose();
b?.Dispose();
}
}
private static void SubtestReadWriteMessage(MessageStream stream, LengthPrefixStyle lps, Action reset)
{
var rand = new Random(Environment.TickCount);
var msgs = Enumerable.Range(0, 64).Select(_ =>
{
var msg = new byte[ReaderWriterTests.GetMaxLength(lps, rand.Next(16, 1024))];
rand.NextBytes(msg);
return(msg);
}).ToList();
msgs.ForEach(stream.WriteMessage);
reset();
foreach (var msg in msgs)
{
var msg2 = stream.ReadMessage();
Assert.That(msg2, Is.EqualTo(msg));
}
}
private static void SubtestReadWrite(MessageWriter w, MessageReader r, LengthPrefixStyle lps, Action reset)
{
var rand = new Random(Environment.TickCount);
var msgs = Enumerable.Range(0, 64).Select(_ =>
{
var msg = new byte[GetMaxLength(lps, rand.Next(16, 1024))];
rand.NextBytes(msg);
return(msg);
}).ToList();
msgs.ForEach(msg => w.Write(msg, 0, msg.Length));
reset();
foreach (var msg in msgs)
{
var msg2 = new byte[msg.Length];
r.Read(msg2, 0, msg2.Length);
Assert.That(msg2, Is.EqualTo(msg));
}
}
private static async Task SubtestReadWriteMessageAsync(MessageStream stream, LengthPrefixStyle lps, Action reset)
{
var rand = new Random(Environment.TickCount);
var msgs = Enumerable.Range(0, 64).Select(_ =>
{
var msg = new byte[ReaderWriterTests.GetMaxLength(lps, rand.Next(16, 1024))];
rand.NextBytes(msg);
return(msg);
}).ToList();
var tasks = msgs.Select(msg => stream.WriteMessageAsync(msg, CancellationToken.None));
await Task.WhenAll(tasks);
reset();
foreach (var msg in msgs)
{
var msg2 = await stream.ReadMessageAsync(CancellationToken.None);
Assert.That(msg2, Is.EqualTo(msg));
}
}
private static void SubtestReadWriteRandomLengths(MessageWriter w, MessageReader r, LengthPrefixStyle lps, Action reset)
{
var rand = new Random(Environment.TickCount);
var msgs = Enumerable.Range(0, 32).Select(_ =>
{
var msg = new byte[GetMaxLength(lps, rand.Next(16, 1024))];
rand.NextBytes(msg);
return(msg);
}).ToList();
msgs.ForEach(msg => w.Write(msg, 0, msg.Length));
reset();
var expected = msgs.SelectMany(msg => msg).ToArray();
var result = new byte[expected.Length];
var total = 0;
while (total < expected.Length)
{
var bytesRead = r.Read(result, total, rand.Next(4, 64));
if (bytesRead < 1)
{
break;
}
total += bytesRead;
}
Assert.That(result, Is.EqualTo(expected));
}
private static async Task SubtestReadWriteRandomLengthsAsync(MessageWriter w, MessageReader r, LengthPrefixStyle lps, Action reset)
{
var rand = new Random(Environment.TickCount);
var msgs = Enumerable.Range(0, 32).Select(_ =>
{
var msg = new byte[GetMaxLength(lps, rand.Next(16, 1024))];
rand.NextBytes(msg);
return(msg);
}).ToList();
var tasks = msgs.Select(msg => w.WriteAsync(msg, 0, msg.Length, CancellationToken.None));
await Task.WhenAll(tasks).ConfigureAwait(false);
reset();
var expected = msgs.SelectMany(msg => msg).ToArray();
var result = new byte[expected.Length];
var total = 0;
while (total < expected.Length)
{
var bytesRead = await r.ReadAsync(result, total, rand.Next(4, 64), CancellationToken.None).ConfigureAwait(false);
if (bytesRead < 1)
{
break;
}
total += bytesRead;
}
Assert.That(result, Is.EqualTo(expected));
}