internal override SCTPMessage makeMessage(string bytes, BlockingSCTPStream s)
{
SCTPMessage m = null;
if (base.canSend())
{
if (bytes.Length < this.maxMessageSize())
{
m = new SCTPMessage(bytes, s);
lock (s)
{
int mseq = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(mseq + 1);
m.setSeq(mseq);
}
}
else
{
logger.LogWarning("Message too long " + bytes.Length + " > " + this.maxMessageSize());
}
}
else
{
logger.LogWarning("Can't send a message right now");
}
return(m);
}
internal override void sendAndBlock(SCTPMessage m)
{
while (m.hasMoreData())
{
DataChunk dc;
lock (_freeBlocks)
{
dc = _freeBlocks.Count > 0 ? _freeBlocks.Dequeue() : new DataChunk();
}
m.fill(dc);
//logger.LogDebug("thinking about waiting for congestion " + dc.getTsn());
lock (_congestion)
{
//logger.LogDebug("In congestion sync block ");
while (!this.maySend(dc.getDataSize()))
{
//logger.LogDebug("about to wait for congestion for " + this.getT3());
Monitor.Wait(_congestion, (int)this.getT3()); // wholly wrong
}
}
// todo check rollover - will break at maxint.
enqueue(dc);
}
}
public override void send(byte[] message)
{
lock (this)
{
Association a = base.getAssociation();
SCTPMessage m = a.makeMessage(message, this);
undeliveredOutboundMessages.Add(m.getSeq(), m);
a.sendAndBlock(m);
}
}
public override void send(string message)
{
lock (this)
{
Association a = base.getAssociation();
SCTPMessage m = a.makeMessage(message, this);
if (m == null)
{
logger.LogError("SCTPMessage cannot be null, but it is");
}
a.sendAndBlock(m);
}
}
public override async Task sendasync(string message)
{
await semaphore.WaitAsync().ConfigureAwait(false);
try
{
Association a = base.getAssociation();
SCTPMessage m = a.makeMessage(message, this);
if (m == null)
{
logger.LogError("SCTPMessage cannot be null, but it is");
return;
}
a.sendAndBlock(m);
}
finally
{
semaphore.Release();
}
}
public override async Task sendasync(byte[] message)
{
await semaphore.WaitAsync().ConfigureAwait(false);
try
{
Association a = base.getAssociation();
SCTPMessage m = a.makeMessage(message, this);
if (m == null)
{
logger.LogError("SCTPMessage cannot be null, but it is");
return;
}
undeliveredOutboundMessages.AddOrUpdate(m.getSeq(), m, (id, b) => m);
a.sendAndBlock(m);
}
finally
{
semaphore.Release();
}
}
internal override SCTPMessage makeMessage(byte[] bytes, BlockingSCTPStream s)
{
lock (this)
{
SCTPMessage m = null;
if (base.canSend())
{
if (bytes.Length < this.maxMessageSize())
{
m = new SCTPMessage(bytes, s);
lock (s)
{
int mseq = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(mseq + 1);
m.setSeq(mseq);
}
}
}
return(m);
}
}
public void deliver(SCTPStream s, SortedArray <DataChunk> stash, SCTPStreamListener l)
{
//stash is the list of all DataChunks that have not yet been turned into whole messages
//we assume that it is sorted by stream sequence number.
List <DataChunk> delivered = new List <DataChunk>();
if (stash.Count == 0)
{
return; // I'm not fond of these early returns
}
long expectedTsn = stash.First.getTsn(); // This ignores gaps - but _hopefully_ messageNo will catch any
// gaps we care about - ie gaps in the sequence for _this_ stream
// we can deliver ordered messages on this stream even if earlier messages from other streams are missing
// - this does assume that the tsn's of a message are contiguous -which is odd.
foreach (DataChunk dc in stash)
{
int messageNo = s.getNextMessageSeqIn();
int flags = dc.getFlags() & DataChunk.SINGLEFLAG; // mask to the bits we want
long tsn = dc.getTsn();
bool lookingForOrderedMessages = _ordered;
if (lookingForOrderedMessages && (tsn != expectedTsn))
{
logger.LogDebug("Hole in chunk sequence " + tsn + " expected " + expectedTsn);
break;
}
switch (flags)
{
case DataChunk.SINGLEFLAG:
if (_ordered && (messageNo != dc.getSSeqNo()))
{
logger.LogDebug("Hole (single) in message sequence " + dc.getSSeqNo() + " expected " +
messageNo);
break; // not the message we are looking for...
}
SCTPMessage single = new SCTPMessage(s, dc);
if (single.deliver(l))
{
delivered.Add(dc);
messageNo++;
s.setNextMessageSeqIn(messageNo);
}
break;
case DataChunk.BEGINFLAG:
case DataChunk.ENDFLAG:
case DataChunk.CONTINUEFLAG:
if (_ordered && (messageNo != dc.getSSeqNo()))
{
logger.LogDebug("Hole (single) in message sequence " + dc.getSSeqNo() + " expected " +
messageNo);
break; // not the message we are looking for...
}
var orderedMessage = _orderedMessageHandler.GetMessage(dc.getSSeqNo())
.Add(dc, flags);
if (orderedMessage.IsReady)
{
orderedMessage.Finish(() =>
{
SCTPMessage deliverable = new SCTPMessage(s, orderedMessage.ToArray());
if (deliverable.deliver(l))
{
_orderedMessageHandler.RemoveMessage(orderedMessage);
orderedMessage.AddToList(delivered);
messageNo++;
s.setNextMessageSeqIn(messageNo);
}
});
}
break;
default:
throw new Exception("[IllegalStateException] Impossible value in stream logic");
}
expectedTsn = tsn + 1;
}
stash.RemoveWhere((dc) => { return(delivered.Contains(dc)); });
}
internal override void deliverMessage(SCTPMessage message)
{
message.run();
}
abstract internal void deliverMessage(SCTPMessage message);
abstract internal void sendAndBlock(SCTPMessage m);
internal override void deliverMessage(SCTPMessage message)
{
ThreadPool.QueueUserWorkItem((obj) => { message.run(); });
}
public void deliver(SCTPStream s, SortedArray <DataChunk> stash, SCTPStreamListener l)
{
//stash is the list of all DataChunks that have not yet been turned into whole messages
//we assume that it is sorted by stream sequence number.
List <DataChunk> delivered = new List <DataChunk>();
SortedArray <DataChunk> message = null;
if (stash.Count == 0)
{
return; // I'm not fond of these early returns
}
long expectedTsn = stash.First.getTsn(); // This ignores gaps - but _hopefully_ messageNo will catch any
// gaps we care about - ie gaps in the sequence for _this_ stream
// we can deliver ordered messages on this stream even if earlier messages from other streams are missing
// - this does assume that the tsn's of a message are contiguous -which is odd.
foreach (DataChunk dc in stash)
{
int messageNo = s.getNextMessageSeqIn();
int flags = dc.getFlags() & DataChunk.SINGLEFLAG; // mask to the bits we want
long tsn = dc.getTsn();
bool lookingForOrderedMessages = _ordered || (message != null);
// which is to say for unordered messages we can tolerate gaps _between_ messages
// but not within them
if (lookingForOrderedMessages && (tsn != expectedTsn))
{
logger.LogDebug("Hole in chunk sequence " + tsn + " expected " + expectedTsn);
break;
}
switch (flags)
{
case DataChunk.SINGLEFLAG:
// singles are easy - just dispatch.
if (_ordered && (messageNo != dc.getSSeqNo()))
{
logger.LogDebug("Hole (single) in message sequence " + dc.getSSeqNo() + " expected " + messageNo);
break; // not the message we are looking for...
}
SCTPMessage single = new SCTPMessage(s, dc);
if (single.deliver(l))
{
delivered.Add(dc);
messageNo++;
s.setNextMessageSeqIn(messageNo);
}
break;
case DataChunk.BEGINFLAG:
if (_ordered && (messageNo != dc.getSSeqNo()))
{
logger.LogDebug("Hole (begin) in message sequence " + dc.getSSeqNo() + " expected " + messageNo);
break; // not the message we are looking for...
}
message = new SortedArray <DataChunk>();
message.Add(dc);
logger.LogDebug("new message no" + dc.getSSeqNo() + " starts with " + dc.getTsn());
break;
case 0: // middle
if (message != null)
{
message.Add(dc);
logger.LogDebug("continued message no" + dc.getSSeqNo() + " with " + dc.getTsn());
}
else
{
// perhaps check sno ?
logger.LogDebug("Middle with no start" + dc.getSSeqNo() + " tsn " + dc.getTsn());
}
break;
case DataChunk.ENDFLAG:
if (message != null)
{
message.Add(dc);
logger.LogDebug("finished message no" + dc.getSSeqNo() + " with " + dc.getTsn());
SCTPMessage deliverable = new SCTPMessage(s, message);
if (deliverable.deliver(l))
{
message.AddToList(delivered);
messageNo++;
s.setNextMessageSeqIn(messageNo);
}
message = null;
}
else
{
logger.LogDebug("End with no start" + dc.getSSeqNo() + " tsn " + dc.getTsn());
message = null;
}
break;
default:
throw new Exception("[IllegalStateException] Impossible value in stream logic");
}
expectedTsn = tsn + 1;
}
stash.RemoveWhere((dc) => { return(delivered.Contains(dc)); });
}