public static void writeChId(NaiveMultiplexing m, BytesView bv, int id, ref int cur)
{
int idLen = m.sendChannelIdLength;
if (idLen == 1)
{
var i = id == ReservedId ? (sbyte.MinValue) : (sbyte)id;
bv[cur++] = (byte)i;
}
else if (idLen == 2)
{
var i = id == ReservedId ? (short.MinValue) : (short)id;
bv[cur++] = (byte)(i >> 8);
bv[cur++] = (byte)(i);
}
else if (idLen == 4)
{
for (int i = 4 - 1; i >= 0; i--)
{
bv[cur++] = (byte)(id >> (i * 8));
}
}
else
{
string message = $"BUG?: unexpected recvChannelIdLength ({m.recvChannelIdLength})";
Logging.error($"{m}: " + message);
throw new Exception(message);
}
}
public async Task <int> ReadAsync(BytesSegment bs)
{
var pos = 0;
var curnode = latestMsg;
if (curnode == null || curnode.tlen == 0)
{
curnode = (await MsgStream.RecvMsgR(null)).Data;
if (curnode == null)
{
return(0);
}
}
do
{
if (curnode.len > 0)
{
var size = Math.Min(bs.Len, curnode.len);
Buffer.BlockCopy(curnode.bytes, curnode.offset, bs.Bytes, bs.Offset + pos, size);
curnode.SubSelf(size);
pos += size;
}
} while (pos < bs.Len && (curnode = curnode.nextNode) != null);
if (curnode == null || curnode.tlen == 0)
{
latestMsg = null;
}
else
{
latestMsg = curnode;
}
return(pos);
}
private async Task SendImpl(Msg msg, byte flags)
{
var header = BufferPool.GlobalGetBs(4);
int hPos = 0;
int len = msg.Data.len;
if (len > 0x00ffffff)
{
throw new ArgumentOutOfRangeException("msg", "msg is too long!");
}
for (int i = 3 - 1; i >= 0; i--)
{
header[hPos++] = (byte)((len >> (i * 8)) & (0xff));
}
header[hPos++] = flags;
var bv = new BytesView(header.Bytes, header.Offset, header.Len);
Filters.OnWrite(bv);
if (bv.len != hPos)
{
throw new Exception("filters are not allowed to change data size");
}
Filters.OnWrite(msg.Data);
if (msg.Data.len != len)
{
throw new Exception("filters are not allowed to change data size");
}
bv.nextNode = msg.Data;
await BaseStream.WriteMultipleAsyncR(bv);
}
public AwaitableWrapper <Msg> RecvMsgR(BytesView buf)
{
if (readEOF)
{
ThrowInvalidOperation();
}
raR.Reset();
raR_deq = recvQueue.DequeueAsync(out raR_noWaiting);
if (raR_continuation == null)
{
raR_continuation = () => {
Msg m;
var tmp = raR_deq;
raR_deq = null;
if (!tmp.TryGetResult(out m, out var ex))
{
raR.SetException(ex);
}
else
{
try {
m = rar_continuation2(m);
} catch (Exception e) {
raR.SetException(e);
return;
}
raR.SetResult(m);
}
};
private Task WriteMultipleAsyncImpl(BytesView bv)
{
if (bv.nextNode == null)
{
return(WriteAsync(new BytesSegment(bv)));
}
var e = writeArgPool.GetValue();
int count = 0;
foreach (var cur in bv)
{
if (cur.len > 0)
{
count++;
}
}
var bufList = new ArraySegment <byte> [count];
var index = 0;
foreach (var cur in bv)
{
if (cur.len > 0)
{
bufList[index++] = new ArraySegment <byte>(cur.bytes, cur.offset, cur.len);
}
}
e.BufferList = bufList;
return(SendAsync(e));
}
public static Frame unpack(NaiveMultiplexing m, BytesView bv)
{
var cur = 0;
int id = getChId(m, bv, ref cur);
bv.SubSelf(cur);
return(new Frame {
Id = id, Data = bv
});
}
public AwaitableWrapper WriteMultipleAsyncR(BytesView bv)
{
if (raWm == null)
{
raWm = new ReusableAwaiter <VoidType> .BeginEndStateMachine <SocketStream1>(this, WriteMultipleEnd);
}
raWm.Reset();
ArraySegment <byte>[] bufList = PrepareWriteMultiple(bv);
WriteMultipleBegin(this, bufList, raWm.ArgCallback, raWm.ArgState);
return(new AwaitableWrapper(raWm));
}
public static byte[] EncryptOrDecryptBytes(bool isEncrypting, byte[] key, byte[] buf)
{
var bv = new BytesView(buf);
if (key.Length > 16)
{
key = key.Take(16).ToArray();
}
WebSocket.GetAesFilter2(isEncrypting, key)(bv);
return(bv.GetBytes());
}
internal async Task SendOpcode(Channel ch, byte opcode)
{
BytesView bv = new BytesView(new byte[4 + 1]);
Task task = null;
lock (_sendLock) {
int cur = 0;
Frame.writeChId(this, bv, ch.Id, ref cur);
bv[cur++] = opcode;
task = this.SendMsg_NoLock(ReservedChannel, bv);
}
await task.CAF();
}
public BytesView pack(NaiveMultiplexing m, BytesView headerBv = null)
{
Debug.Assert(Id <= m.currentMaxId, $"Id > currentMaxId ({m})");
if (headerBv == null)
{
headerBv = new BytesView(new byte[getSendChIdLen(m)]);
}
var cur = 0;
writeChId(m, headerBv, Id, ref cur);
headerBv.len = cur;
headerBv.nextNode = Data;
return(headerBv);
}
public static uint Append(BytesView bv, uint initial)
{
uint crc = initial;
while (bv != null)
{
if (bv.len > 0)
{
crc = Crc32CAlgorithm.Append(crc, bv.bytes, bv.offset, bv.len);
}
bv = bv.nextNode;
}
return(crc);
}
public async Task <Msg> RecvMsg(BytesView buf)
{
while (true)
{
Msg msg = Msg.EOF;
await WaitBaseStream();
try {
msg = await BaseStream.RecvMsg(buf);
} catch (Exception) {
}
if (msg.IsEOF)
{
OnBaseStreamFailed();
continue;
}
var data = msg.Data;
var opcode = (Opcode)data[0];
if (opcode == Opcode.Data)
{
ReceivedPacketsCount++;
SendAck();
return(msg);
}
else if (opcode == Opcode.AckOneMessage)
{
AckedPacketsCount++;
var acked = unackedPackets.Dequeue();
SendingWindowAdd(acked.Len);
}
else if (opcode == Opcode.AckMessages)
{
int seq = BitConverter.ToInt32(data.bytes, data.offset + 1);
int totalLen = 0;
while (unackedPackets.Peek().Seq <= seq)
{
AckedPacketsCount++;
var acked = unackedPackets.Dequeue();
totalLen += acked.Len;
}
SendingWindowAdd(totalLen);
}
else
{
throw new Exception("unknown opcode: " + opcode);
}
}
}
public Task <Msg> RecvMsg(BytesView buf)
{
lock (_syncRoot) {
if (MState.HasRemoteShutdown)
{
throw new InvalidOperationException("remote shutdown");
}
if (lastRecv?.IsCompleted == false)
{
throw new Exception("another RecvMsg() task is running");
}
var t = _RecvMsg(buf);
lastRecv = t;
return(t);
}
}
public async Task <Msg> _RecvMsg(BytesView buf)
{
if (!_conn.ivReceived)
{
_conn.ivReceived = true;
var recvEnc = _conn.enc(false);
recvEnc.IV = (await ws.ReadAsync()).payload;
ws.AddReadFilter(FilterBase.GetStreamFilterFromIVEncryptor(false, recvEnc, true));
}
var frame = await ws.ReadAsync();
if (frame.opcode == 0x01)
{
OnFinReceived();
return(Msg.EOF);
}
return(frame.payload);
}
public static AwaitableWrapper WriteMultipleAsyncR(this IMyStream myStream, BytesView bv)
{
if (myStream is IMyStreamMultiBuffer bvs)
{
return(bvs.WriteMultipleAsyncR(bv));
}
else
{
return(new AwaitableWrapper(NaiveUtils.RunAsyncTask(async() => {
foreach (var item in bv)
{
if (item.len > 0)
{
await myStream.WriteAsync(new BytesSegment(item));
}
}
})));
}
}
private static ArraySegment <byte>[] PrepareWriteMultiple(BytesView bv)
{
int count = 0;
foreach (var cur in bv)
{
if (cur.len > 0)
{
count++;
}
}
var bufList = new ArraySegment <byte> [count];
var index = 0;
foreach (var cur in bv)
{
if (cur.len > 0)
{
bufList[index++] = new ArraySegment <byte>(cur.bytes, cur.offset, cur.len);
}
}
return(bufList);
}
public static int getChId(NaiveMultiplexing m, BytesView bv, ref int cur)
{
int id = 0;
int idLen = m.recvChannelIdLength;
if (idLen == 1)
{
id = (sbyte)bv[cur++];
if (id == sbyte.MinValue)
{
id = ReservedId;
}
}
else if (idLen == 2)
{
id = (short)(bv[cur++] << 8 | bv[cur++]);
if (id == short.MinValue)
{
id = ReservedId;
}
}
else if (idLen == 4)
{
for (int i = 4 - 1; i >= 0; i--)
{
id |= (bv[cur++] << (i * 8));
}
}
else
{
string message = $"BUG?: unexpected recvChannelIdLength ({idLen})";
Logging.error($"{m}: " + message);
throw new Exception(message);
}
return(id);
}
public Task <Msg> RecvMsg(BytesView buf)
{
if (PreReadEnabled && recvTasks == null)
{
recvTasks = new Task <Msg> [recvStreams.Length];
for (int i = 0; i < recvStreams.Length; i++)
{
var i2 = i;
recvTasks[i] = Task.Run(() => recvStreams[i2].RecvMsg(null));
}
}
if (nextRecv == recvStreams.Length)
{
nextRecv = 0;
}
var curRecv2 = nextRecv++;
if (recvTasks != null)
{
var task = recvTasks[curRecv2];
recvTasks[curRecv2] = (!task.IsCompleted)
? NaiveUtils.RunAsyncTask(async(s) => {
await s.prevTask;
return(await s.curStream.RecvMsg(null));
}, new recvArgs {
prevTask = task, curStream = recvStreams[curRecv2]
})
//? task.ContinueWith((t, s) => s.CastTo<IMsgStream>().RecvMsg(null), recvStreams[curRecv2], TaskContinuationOptions.ExecuteSynchronously).Unwrap()
: recvStreams[curRecv2].RecvMsg(null);
return(task);
}
else
{
return(recvStreams[curRecv2].RecvMsg(buf));
}
}
public AwaitableWrapper WriteMultipleAsyncR(BytesView bv)
{
return(new AwaitableWrapper(MsgStream.SendMsg(new Msg(bv))));
}
public static uint Compute(BytesView bv)
{
return(Append(bv, 0));
}
public Task WriteMultipleAsync(BytesView bv)
{
ArraySegment <byte>[] bufList = PrepareWriteMultiple(bv);
return(TaskHelper.FromAsyncTrim(this, bufList, WriteMultipleBegin, WriteMultipleEnd));
}
public async Task <Msg> RecvMsg(BytesView buf)
{
return(await RecvMsgR(buf));
}
public async Task <Msg> RecvMsg(BytesView buf)
{
var frame = await RecvImpl();
return(new Msg(frame.Payload));
}
public AwaitableWrapper WriteMultipleAsyncR(BytesView bv)
{
return(new AwaitableWrapper(WriteMultipleAsyncImpl(bv)));
}
public Frame(int id, BytesView data)
{
Id = id;
Data = data;
}