private QueuedBlockMsg ReadInputMessage(NetworkChannel netChan)
{
this.m_timeoutPending = false;
byte[] networkReadWorkingBuf = this.m_networkReadWorkingBuf;
StopwatchStamp stamp = StopwatchStamp.GetStamp();
NetworkChannelMessageHeader msgHdr = NetworkChannelMessage.ReadHeaderFromNet(netChan, networkReadWorkingBuf, 0);
NetworkChannelMessage.MessageType messageType = msgHdr.MessageType;
QueuedBlockMsg queuedBlockMsg;
if (messageType != NetworkChannelMessage.MessageType.BlockModeCompressedData)
{
if (messageType == NetworkChannelMessage.MessageType.Ping)
{
PingMessage pingMessage = PingMessage.ReadFromNet(netChan, networkReadWorkingBuf, 0);
long systemPerformanceCounter = Win32StopWatch.GetSystemPerformanceCounter();
long arg = Win32StopWatch.ComputeElapsedTimeInUSec(systemPerformanceCounter, pingMessage.ReplyAckCounter) / 1000L;
this.Copier.TrackLastContactTime(msgHdr.MessageUtc);
PassiveBlockMode.Tracer.TraceDebug <string, long>((long)this.GetHashCode(), "ProcessReadCallback({0}) received a ping after {1}ms, so channel is healthy", this.DatabaseName, arg);
return(null);
}
if (messageType != NetworkChannelMessage.MessageType.GranularLogData)
{
throw new NetworkUnexpectedMessageException(netChan.PartnerNodeName, string.Format("Unknown Type {0}", msgHdr.MessageType));
}
queuedBlockMsg = this.ReadUncompressedMsg(netChan);
this.Copier.PerfmonCounters.CompressionEnabled = 0L;
}
else
{
queuedBlockMsg = this.ReadCompressedMsg(netChan, msgHdr);
this.Copier.PerfmonCounters.CompressionEnabled = 1L;
}
queuedBlockMsg.ReadDurationInTics = stamp.ElapsedTicks;
queuedBlockMsg.MessageUtc = msgHdr.MessageUtc;
this.Copier.PerfmonCounters.RecordLogCopierNetworkReadLatency(queuedBlockMsg.ReadDurationInTics);
return(queuedBlockMsg);
}
private QueuedBlockMsg ReadCompressedMsg(NetworkChannel netChan, NetworkChannelMessageHeader msgHdr)
{
byte[] networkReadWorkingBuf = this.m_networkReadWorkingBuf;
BlockModeCompressedDataMsg blockModeCompressedDataMsg = BlockModeCompressedDataMsg.ReadFromNet(netChan, networkReadWorkingBuf, 0);
byte[] array = null;
int num = 0;
int num2 = 0;
if (blockModeCompressedDataMsg.LogDataLength > 0)
{
this.GetAppendSpace(blockModeCompressedDataMsg.LogDataLength);
array = this.m_currentBuffer.Buffer;
num = this.m_currentBuffer.AppendOffset;
int num3 = blockModeCompressedDataMsg.LogDataLength;
int num4 = num;
foreach (int num5 in blockModeCompressedDataMsg.CompressedLengths)
{
num2 += num5;
netChan.Read(networkReadWorkingBuf, 0, num5);
int num6 = Math.Min(num3, 65536);
if (!Xpress.Decompress(networkReadWorkingBuf, 0, num5, array, num4, num6))
{
throw new NetworkCorruptDataException(this.m_netChannel.PartnerNodeName);
}
num3 -= num6;
num4 += num6;
}
this.m_currentBuffer.AppendOffset = num + blockModeCompressedDataMsg.LogDataLength;
}
return(new QueuedBlockMsg(blockModeCompressedDataMsg.EmitContext, array, num, num2)
{
RequestAckCounter = blockModeCompressedDataMsg.RequestAckCounter,
IOBuffer = this.m_currentBuffer
});
}