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XrdClAsyncSocketHandler.cc
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XrdClAsyncSocketHandler.cc
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//------------------------------------------------------------------------------
// Copyright (c) 2011-2012 by European Organization for Nuclear Research (CERN)
// Author: Lukasz Janyst <ljanyst@cern.ch>
//------------------------------------------------------------------------------
// XRootD is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// XRootD is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with XRootD. If not, see <http://www.gnu.org/licenses/>.
//------------------------------------------------------------------------------
#include "XrdCl/XrdClStream.hh"
#include "XrdCl/XrdClConstants.hh"
#include "XrdCl/XrdClLog.hh"
#include "XrdCl/XrdClMessage.hh"
#include "XrdCl/XrdClAsyncSocketHandler.hh"
#include "XrdCl/XrdClXRootDTransport.hh"
#include "XrdCl/XrdClXRootDMsgHandler.hh"
#include "XrdCl/XrdClOptimizers.hh"
#include <netinet/tcp.h>
namespace XrdCl
{
//----------------------------------------------------------------------------
// Constructor
//----------------------------------------------------------------------------
AsyncSocketHandler::AsyncSocketHandler( Poller *poller,
TransportHandler *transport,
AnyObject *channelData,
uint16_t subStreamNum ):
pPoller( poller ),
pTransport( transport ),
pChannelData( channelData ),
pSubStreamNum( subStreamNum ),
pStream( 0 ),
pSocket( 0 ),
pIncoming( 0 ),
pHSIncoming( 0 ),
pOutgoing( 0 ),
pSignature( 0 ),
pHSOutgoing( 0 ),
pHandShakeData( 0 ),
pHandShakeDone( false ),
pConnectionStarted( 0 ),
pConnectionTimeout( 0 ),
pHeaderDone( false ),
pOutMsgDone( false ),
pOutHandler( 0 ),
pIncMsgSize( 0 ),
pOutMsgSize( 0 )
{
Env *env = DefaultEnv::GetEnv();
int timeoutResolution = DefaultTimeoutResolution;
env->GetInt( "TimeoutResolution", timeoutResolution );
pTimeoutResolution = timeoutResolution;
pSocket = new Socket();
pSocket->SetChannelID( pChannelData );
pIncHandler = std::make_pair( (IncomingMsgHandler*)0, false );
pLastActivity = time(0);
}
//----------------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------------
AsyncSocketHandler::~AsyncSocketHandler()
{
Close();
delete pSocket;
delete pSignature;
}
//----------------------------------------------------------------------------
// Connect to given address
//----------------------------------------------------------------------------
Status AsyncSocketHandler::Connect( time_t timeout )
{
Log *log = DefaultEnv::GetLog();
pLastActivity = pConnectionStarted = ::time(0);
pConnectionTimeout = timeout;
//--------------------------------------------------------------------------
// Initialize the socket
//--------------------------------------------------------------------------
Status st = pSocket->Initialize( pSockAddr.Family() );
if( !st.IsOK() )
{
log->Error( AsyncSockMsg, "[%s] Unable to initialize socket: %s",
pStreamName.c_str(), st.ToString().c_str() );
st.status = stFatal;
return st;
}
//--------------------------------------------------------------------------
// Set the keep-alive up
//--------------------------------------------------------------------------
Env *env = DefaultEnv::GetEnv();
int keepAlive = DefaultTCPKeepAlive;
env->GetInt( "TCPKeepAlive", keepAlive );
if( keepAlive )
{
int param = 1;
Status st = pSocket->SetSockOpt( SOL_SOCKET, SO_KEEPALIVE, ¶m,
sizeof(param) );
if( !st.IsOK() )
log->Error( AsyncSockMsg, "[%s] Unable to turn on keepalive: %s",
st.ToString().c_str() );
#if defined(__linux__) && defined( TCP_KEEPIDLE ) && \
defined( TCP_KEEPINTVL ) && defined( TCP_KEEPCNT )
param = DefaultTCPKeepAliveTime;
env->GetInt( "TCPKeepAliveTime", param );
st = pSocket->SetSockOpt(SOL_TCP, TCP_KEEPIDLE, ¶m, sizeof(param));
if( !st.IsOK() )
log->Error( AsyncSockMsg, "[%s] Unable to set keepalive time: %s",
st.ToString().c_str() );
param = DefaultTCPKeepAliveInterval;
env->GetInt( "TCPKeepAliveInterval", param );
st = pSocket->SetSockOpt(SOL_TCP, TCP_KEEPINTVL, ¶m, sizeof(param));
if( !st.IsOK() )
log->Error( AsyncSockMsg, "[%s] Unable to set keepalive interval: %s",
st.ToString().c_str() );
param = DefaultTCPKeepAliveProbes;
env->GetInt( "TCPKeepAliveProbes", param );
st = pSocket->SetSockOpt(SOL_TCP, TCP_KEEPCNT, ¶m, sizeof(param));
if( !st.IsOK() )
log->Error( AsyncSockMsg, "[%s] Unable to set keepalive probes: %s",
st.ToString().c_str() );
#endif
}
pHandShakeDone = false;
//--------------------------------------------------------------------------
// Initiate async connection to the address
//--------------------------------------------------------------------------
char nameBuff[256];
pSockAddr.Format( nameBuff, sizeof(nameBuff), XrdNetAddrInfo::fmtAdv6 );
log->Debug( AsyncSockMsg, "[%s] Attempting connection to %s",
pStreamName.c_str(), nameBuff );
st = pSocket->ConnectToAddress( pSockAddr, 0 );
if( !st.IsOK() )
{
log->Error( AsyncSockMsg, "[%s] Unable to initiate the connection: %s",
pStreamName.c_str(), st.ToString().c_str() );
return st;
}
pSocket->SetStatus( Socket::Connecting );
//--------------------------------------------------------------------------
// We should get the ready to write event once we're really connected
// so we need to listen to it
//--------------------------------------------------------------------------
if( !pPoller->AddSocket( pSocket, this ) )
{
Status st( stFatal, errPollerError );
pSocket->Close();
return st;
}
if( !pPoller->EnableWriteNotification( pSocket, true, pTimeoutResolution ) )
{
Status st( stFatal, errPollerError );
pPoller->RemoveSocket( pSocket );
pSocket->Close();
return st;
}
return Status();
}
//----------------------------------------------------------------------------
// Close the connection
//----------------------------------------------------------------------------
Status AsyncSocketHandler::Close()
{
Log *log = DefaultEnv::GetLog();
log->Debug( AsyncSockMsg, "[%s] Closing the socket", pStreamName.c_str() );
pTransport->Disconnect( *pChannelData, pStream->GetStreamNumber(),
pSubStreamNum );
pPoller->RemoveSocket( pSocket );
pSocket->Close();
if( !pIncHandler.second )
delete pIncoming;
pIncoming = 0;
return Status();
}
//----------------------------------------------------------------------------
// Set a stream object to be notified about the status of the operations
//----------------------------------------------------------------------------
void AsyncSocketHandler::SetStream( Stream *stream )
{
pStream = stream;
std::ostringstream o;
o << pStream->GetURL()->GetHostId();
o << " #" << pStream->GetStreamNumber();
o << "." << pSubStreamNum;
pStreamName = o.str();
}
//----------------------------------------------------------------------------
// Handler a socket event
//----------------------------------------------------------------------------
void AsyncSocketHandler::Event( uint8_t type, XrdCl::Socket */*socket*/ )
{
//--------------------------------------------------------------------------
// Read event
//--------------------------------------------------------------------------
if( type & ReadyToRead )
{
pLastActivity = time(0);
if( likely( pHandShakeDone ) )
OnRead();
else
OnReadWhileHandshaking();
}
//--------------------------------------------------------------------------
// Read timeout
//--------------------------------------------------------------------------
else if( type & ReadTimeOut )
{
if( likely( pHandShakeDone ) )
OnReadTimeout();
else
OnTimeoutWhileHandshaking();
}
//--------------------------------------------------------------------------
// Write event
//--------------------------------------------------------------------------
if( type & ReadyToWrite )
{
pLastActivity = time(0);
if( unlikely( pSocket->GetStatus() == Socket::Connecting ) )
OnConnectionReturn();
else if( likely( pHandShakeDone ) )
OnWrite();
else
OnWriteWhileHandshaking();
}
//--------------------------------------------------------------------------
// Write timeout
//--------------------------------------------------------------------------
else if( type & WriteTimeOut )
{
if( likely( pHandShakeDone ) )
OnWriteTimeout();
else
OnTimeoutWhileHandshaking();
}
}
//----------------------------------------------------------------------------
// Connect returned
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnConnectionReturn()
{
//--------------------------------------------------------------------------
// Check whether we were able to connect
//--------------------------------------------------------------------------
Log *log = DefaultEnv::GetLog();
log->Debug( AsyncSockMsg, "[%s] Async connection call returned",
pStreamName.c_str() );
int errorCode = 0;
socklen_t optSize = sizeof( errorCode );
Status st = pSocket->GetSockOpt( SOL_SOCKET, SO_ERROR, &errorCode,
&optSize );
//--------------------------------------------------------------------------
// This is an internal error really (either logic or system fault),
// so we call it a day and don't retry
//--------------------------------------------------------------------------
if( !st.IsOK() )
{
log->Error( AsyncSockMsg, "[%s] Unable to get the status of the "
"connect operation: %s", pStreamName.c_str(),
strerror( errno ) );
pStream->OnConnectError( pSubStreamNum,
Status( stFatal, errSocketOptError, errno ) );
return;
}
//--------------------------------------------------------------------------
// We were unable to connect
//--------------------------------------------------------------------------
if( errorCode )
{
log->Error( AsyncSockMsg, "[%s] Unable to connect: %s",
pStreamName.c_str(), strerror( errorCode ) );
pStream->OnConnectError( pSubStreamNum,
Status( stError, errConnectionError ) );
return;
}
pSocket->SetStatus( Socket::Connected );
//--------------------------------------------------------------------------
// Initialize the handshake
//--------------------------------------------------------------------------
pHandShakeData = new HandShakeData( pStream->GetURL(),
pStream->GetStreamNumber(),
pSubStreamNum );
pHandShakeData->serverAddr = &pSocket->GetServerAddress();
pHandShakeData->clientName = pSocket->GetSockName();
pHandShakeData->streamName = pStreamName;
st = pTransport->HandShake( pHandShakeData, *pChannelData );
++pHandShakeData->step;
if( !st.IsOK() )
{
log->Error( AsyncSockMsg, "[%s] Connection negotiation failed",
pStreamName.c_str() );
pStream->OnConnectError( pSubStreamNum, st );
return;
}
//--------------------------------------------------------------------------
// Transport has given us something to send
//--------------------------------------------------------------------------
if( pHandShakeData->out )
{
pHSOutgoing = pHandShakeData->out;
pHandShakeData->out = 0;
}
//--------------------------------------------------------------------------
// Listen to what the server has to say
//--------------------------------------------------------------------------
if( !pPoller->EnableReadNotification( pSocket, true, pTimeoutResolution ) )
{
pStream->OnConnectError( pSubStreamNum,
Status( stFatal, errPollerError ) );
return;
}
}
//----------------------------------------------------------------------------
// Got a write readiness event
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnWrite()
{
//--------------------------------------------------------------------------
// Pick up a message if we're not in process of writing something
//--------------------------------------------------------------------------
if( !pOutgoing )
{
pOutMsgDone = false;
std::pair<Message *, OutgoingMsgHandler *> toBeSent;
toBeSent = pStream->OnReadyToWrite( pSubStreamNum );
pOutgoing = toBeSent.first; pOutHandler = toBeSent.second;
if( !pOutgoing )
return;
pOutgoing->SetCursor( 0 );
pOutMsgSize = pOutgoing->GetSize();
//------------------------------------------------------------------------
// Secure the message if necessary
//------------------------------------------------------------------------
delete pSignature; pSignature = 0;
XRootDStatus st = GetSignature( pOutgoing, pSignature );
if( !st.IsOK() )
{
OnFault( st );
return;
}
}
//--------------------------------------------------------------------------
// Try to write everything at once: signature, request and raw data
// (this is only supported if pOutHandler is an instance of XRootDMsgHandler)
//--------------------------------------------------------------------------
Status st = WriteMessageAndRaw( pOutgoing, pSignature );
if( !st.IsOK() && st.code == errNotSupported ) //< this part should go away
st = WriteSeparately( pOutgoing, pSignature ); //< once we can add GetMsgBody
//< to OutgoingMsgHandler interface !!!
if( !st.IsOK() )
{
OnFault( st );
return;
}
if( st.code == suRetry )
return;
Log *log = DefaultEnv::GetLog();
log->Dump( AsyncSockMsg, "[%s] Successfully sent message: %s (0x%x).",
pStreamName.c_str(), pOutgoing->GetDescription().c_str(),
pOutgoing );
pStream->OnMessageSent( pSubStreamNum, pOutgoing, pOutMsgSize );
pOutgoing = 0;
//--------------------------------------------------------------------------
// Disable the respective substream if empty
//--------------------------------------------------------------------------
pStream->DisableIfEmpty( pSubStreamNum );
}
//----------------------------------------------------------------------------
// Got a write readiness event while handshaking
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnWriteWhileHandshaking()
{
Status st;
if( !pHSOutgoing )
{
if( !(st = DisableUplink()).IsOK() )
OnFaultWhileHandshaking( st );
return;
}
if( !(st = WriteCurrentMessage( pHSOutgoing )).IsOK() )
{
OnFaultWhileHandshaking( st );
return;
}
if( st.code != suRetry )
{
delete pHSOutgoing;
pHSOutgoing = 0;
if( !(st = DisableUplink()).IsOK() )
OnFaultWhileHandshaking( st );
return;
}
}
//----------------------------------------------------------------------------
// Write the current message
//----------------------------------------------------------------------------
Status AsyncSocketHandler::WriteCurrentMessage( Message *toWrite )
{
Log *log = DefaultEnv::GetLog();
//--------------------------------------------------------------------------
// Try to write down the current message
//--------------------------------------------------------------------------
Message *msg = toWrite;
uint32_t leftToBeWritten = msg->GetSize()-msg->GetCursor();
while( leftToBeWritten )
{
int status = pSocket->Send( msg->GetBufferAtCursor(), leftToBeWritten );
if( status <= 0 )
{
Status ret = Socket::ClassifyErrno( errno );
if( !ret.IsOK() )
toWrite->SetCursor( 0 );
return ret;
}
msg->AdvanceCursor( status );
leftToBeWritten -= status;
}
//--------------------------------------------------------------------------
// We have written the message successfully
//--------------------------------------------------------------------------
log->Dump( AsyncSockMsg, "[%s] Wrote a message: %s (0x%x), %d bytes",
pStreamName.c_str(), toWrite->GetDescription().c_str(),
toWrite, toWrite->GetSize() );
return Status();
}
//----------------------------------------------------------------------------
// Write the message and its signature
//----------------------------------------------------------------------------
Status AsyncSocketHandler::WriteVMessage( Message *toWrite,
Message *&sign,
ChunkList *chunks,
uint32_t *asyncOffset )
{
if( !sign && !chunks ) return WriteCurrentMessage( toWrite );
Log *log = DefaultEnv::GetLog();
const size_t iovcnt = 1 + ( sign ? 1 : 0 ) + ( chunks ? chunks->size() : 0 );
iovec iov[iovcnt];
uint32_t leftToBeWritten = 0;
size_t i = 0;
if( sign )
{
ToIov( *sign, iov[i] );
leftToBeWritten += iov[i].iov_len;
++i;
}
ToIov( *toWrite, iov[i] );
leftToBeWritten += iov[i].iov_len;
++i;
uint32_t rawSize = 0;
if( chunks )
{
rawSize = ToIov( chunks, asyncOffset, iov + i );
leftToBeWritten += rawSize;
}
while( leftToBeWritten )
{
int bytesWritten = pSocket->WriteV( iov, iovcnt );
if( bytesWritten <= 0 )
{
Status ret = Socket::ClassifyErrno( errno );
if( !ret.IsOK() )
toWrite->SetCursor( 0 );
return ret;
}
leftToBeWritten -= bytesWritten;
if( sign )
UpdateAfterWrite( *sign, iov[0], bytesWritten );
i = sign ? 1 : 0;
UpdateAfterWrite( *toWrite, iov[i], bytesWritten );
if( chunks && asyncOffset )
UpdateAfterWrite( chunks, asyncOffset, iov + i + 1, bytesWritten );
}
//--------------------------------------------------------------------------
// We have written the message successfully
//--------------------------------------------------------------------------
if( sign )
log->Dump( AsyncSockMsg, "[%s] WroteV a message signature : %s (0x%x), "
"%d bytes",
pStreamName.c_str(), sign->GetDescription().c_str(),
sign, sign->GetSize() );
log->Dump( AsyncSockMsg, "[%s] WroteV a message: %s (0x%x), %d bytes",
pStreamName.c_str(), toWrite->GetDescription().c_str(),
toWrite, toWrite->GetSize() );
if( chunks )
log->Dump( AsyncSockMsg, "[%s] WroteV raw data: %d bytes",
pStreamName.c_str(), rawSize );
return Status();
}
Status AsyncSocketHandler::WriteMessageAndRaw( Message *toWrite, Message *&sign )
{
// once we can add 'GetMessageBody' to OutgoingMsghandler
// interface we can get rid of the ugly dynamic_cast
static XRootDMsgHandler *xrdHandler = 0;
ChunkList *chunks = 0;
uint32_t *asyncOffset = 0;
if( pOutHandler->IsRaw() )
{
if( xrdHandler != pOutHandler )
xrdHandler = dynamic_cast<XRootDMsgHandler*>( pOutHandler );
if( !xrdHandler )
return Status( stError, errNotSupported );
chunks = xrdHandler->GetMessageBody( asyncOffset );
Log *log = DefaultEnv::GetLog();
log->Dump( AsyncSockMsg, "[%s] Will write the payload in one go with "
"the header for message: %s (0x%x).", pStreamName.c_str(),
pOutgoing->GetDescription().c_str(), pOutgoing );
}
Status st = WriteVMessage( toWrite, sign, chunks, asyncOffset );
if( st.IsOK() && st.code == suDone )
{
if( asyncOffset )
pOutMsgSize += *asyncOffset;
pOutMsgDone = true;
}
return st;
}
Status AsyncSocketHandler::WriteSeparately( Message *toWrite, Message *&sign )
{
//------------------------------------------------------------------------
// Write the message if not already written
//------------------------------------------------------------------------
Status st;
if( !pOutMsgDone )
{
if( !(st = WriteVMessage( toWrite, sign, 0, 0 )).IsOK() )
return st;
if( st.code == suRetry )
return st;
Log *log = DefaultEnv::GetLog();
if( pOutHandler && pOutHandler->IsRaw() )
{
log->Dump( AsyncSockMsg, "[%s] Will call raw handler to write payload "
"for message: %s (0x%x).", pStreamName.c_str(),
pOutgoing->GetDescription().c_str(), pOutgoing );
}
pOutMsgDone = true;
}
//------------------------------------------------------------------------
// Check if the handler needs to be called
//------------------------------------------------------------------------
if( pOutHandler && pOutHandler->IsRaw() )
{
uint32_t bytesWritten = 0;
st = pOutHandler->WriteMessageBody( pSocket->GetFD(), bytesWritten );
pOutMsgSize += bytesWritten;
if( !st.IsOK() )
return st;
if( st.code == suRetry )
return st;
}
return Status();
}
//----------------------------------------------------------------------------
// Got a read readiness event
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnRead()
{
//--------------------------------------------------------------------------
// There is no incoming message currently being processed so we create
// a new one
//--------------------------------------------------------------------------
if( !pIncoming )
{
pHeaderDone = false;
pIncoming = new Message();
pIncHandler = std::make_pair( (IncomingMsgHandler*)0, false );
pIncMsgSize = 0;
}
Status st;
Log *log = DefaultEnv::GetLog();
//--------------------------------------------------------------------------
// We need to read the header first
//--------------------------------------------------------------------------
if( !pHeaderDone )
{
st = pTransport->GetHeader( pIncoming, pSocket->GetFD() );
if( !st.IsOK() )
{
OnFault( st );
return;
}
if( st.code == suRetry )
return;
log->Dump( AsyncSockMsg, "[%s] Received message header for 0x%x size: %d",
pStreamName.c_str(), pIncoming, pIncoming->GetCursor() );
pIncMsgSize = pIncoming->GetCursor();
pHeaderDone = true;
std::pair<IncomingMsgHandler *, bool> raw;
pIncHandler = pStream->InstallIncHandler( pIncoming, pSubStreamNum );
if( pIncHandler.first )
{
log->Dump( AsyncSockMsg, "[%s] Will use the raw handler to read body "
"of message 0x%x", pStreamName.c_str(), pIncoming );
}
}
//--------------------------------------------------------------------------
// We need to call a raw message handler to get the data from the socket
//--------------------------------------------------------------------------
if( pIncHandler.first )
{
uint32_t bytesRead = 0;
st = pIncHandler.first->ReadMessageBody( pIncoming, pSocket->GetFD(),
bytesRead );
if( !st.IsOK() )
{
OnFault( st );
return;
}
pIncMsgSize += bytesRead;
if( st.code == suRetry )
return;
}
//--------------------------------------------------------------------------
// No raw handler, so we read the message to the buffer
//--------------------------------------------------------------------------
else
{
st = pTransport->GetBody( pIncoming, pSocket->GetFD() );
if( !st.IsOK() )
{
OnFault( st );
return;
}
if( st.code == suRetry )
return;
pIncMsgSize = pIncoming->GetSize();
}
//--------------------------------------------------------------------------
// Report the incoming message
//--------------------------------------------------------------------------
log->Dump( AsyncSockMsg, "[%s] Received message 0x%x of %d bytes",
pStreamName.c_str(), pIncoming, pIncMsgSize );
pStream->OnIncoming( pSubStreamNum, pIncoming, pIncMsgSize );
pIncoming = 0;
}
//----------------------------------------------------------------------------
// Got a read readiness event while handshaking
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnReadWhileHandshaking()
{
//--------------------------------------------------------------------------
// Read the message and let the transport handler look at it when
// reading has finished
//--------------------------------------------------------------------------
Status st = ReadMessage( pHSIncoming );
if( !st.IsOK() )
{
OnFaultWhileHandshaking( st );
return;
}
if( st.code != suDone )
return;
HandleHandShake();
}
//------------------------------------------------------------------------
// Handle the handshake message
//------------------------------------------------------------------------
void AsyncSocketHandler::HandleHandShake()
{
//--------------------------------------------------------------------------
// OK, we have a new message, let's deal with it;
//--------------------------------------------------------------------------
pHandShakeData->in = pHSIncoming;
pHSIncoming = 0;
Status st = pTransport->HandShake( pHandShakeData, *pChannelData );
//--------------------------------------------------------------------------
// Deal with wait responses
//--------------------------------------------------------------------------
kXR_int32 waitSeconds = HandleWaitRsp( pHandShakeData->in );
delete pHandShakeData->in;
pHandShakeData->in = 0;
if( !st.IsOK() )
{
OnFaultWhileHandshaking( st );
return;
}
//--------------------------------------------------------------------------
// We are handling a wait response and the transport handler told
// as to retry the request
//--------------------------------------------------------------------------
if( st.code == suRetry && waitSeconds >= 0 )
{
time_t resendTime = ::time( 0 ) + waitSeconds;
if( resendTime > pConnectionStarted + pConnectionTimeout )
{
Log *log = DefaultEnv::GetLog();
log->Error( AsyncSockMsg,
"[%s] Wont retry kXR_endsess request because would"
"reach connection timeout.",
pStreamName.c_str() );
OnFaultWhileHandshaking( Status( stError, errSocketTimeout ) );
}
else
{
TaskManager *taskMgr = DefaultEnv::GetPostMaster()->GetTaskManager();
WaitTask *task = new WaitTask( this, pHandShakeData->out );
pHandShakeData->out = 0;
taskMgr->RegisterTask( task, resendTime );
}
return;
}
//--------------------------------------------------------------------------
// We successfully proceeded to the next step
//--------------------------------------------------------------------------
++pHandShakeData->step;
//--------------------------------------------------------------------------
// The transport handler gave us something to write
//--------------------------------------------------------------------------
if( pHandShakeData->out )
{
pHSOutgoing = pHandShakeData->out;
pHandShakeData->out = 0;
Status st;
if( !(st = EnableUplink()).IsOK() )
{
OnFaultWhileHandshaking( st );
return;
}
}
//--------------------------------------------------------------------------
// The hand shake process is done
//--------------------------------------------------------------------------
if( st.IsOK() && st.code == suDone )
{
delete pHandShakeData;
if( !(st = EnableUplink()).IsOK() )
{
OnFaultWhileHandshaking( Status( stFatal, errPollerError ) );
return;
}
pHandShakeDone = true;
pStream->OnConnect( pSubStreamNum );
}
if( !st.IsOK() )
{
OnFaultWhileHandshaking( st );
return;
}
}
//----------------------------------------------------------------------------
// Read a message
//----------------------------------------------------------------------------
Status AsyncSocketHandler::ReadMessage( Message *&toRead )
{
if( !toRead )
{
pHeaderDone = false;
toRead = new Message();
}
Status st;
Log *log = DefaultEnv::GetLog();
if( !pHeaderDone )
{
st = pTransport->GetHeader( toRead, pSocket->GetFD() );
if( st.IsOK() && st.code == suDone )
{
log->Dump( AsyncSockMsg,
"[%s] Received message header, size: %d",
pStreamName.c_str(), toRead->GetCursor() );
pHeaderDone = true;
}
else
return st;
}
st = pTransport->GetBody( toRead, pSocket->GetFD() );
if( st.IsOK() && st.code == suDone )
{
log->Dump( AsyncSockMsg, "[%s] Received a message of %d bytes",
pStreamName.c_str(), toRead->GetSize() );
}
return st;
}
//----------------------------------------------------------------------------
// Handle fault
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnFault( Status st )
{
Log *log = DefaultEnv::GetLog();
log->Error( AsyncSockMsg, "[%s] Socket error encountered: %s",
pStreamName.c_str(), st.ToString().c_str() );
if( !pIncHandler.second )
delete pIncoming;
pIncoming = 0;
pOutgoing = 0;
pOutHandler = 0;
pStream->OnError( pSubStreamNum, st );
}
//----------------------------------------------------------------------------
// Handle fault while handshaking
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnFaultWhileHandshaking( Status st )
{
Log *log = DefaultEnv::GetLog();
log->Error( AsyncSockMsg, "[%s] Socket error while handshaking: %s",
pStreamName.c_str(), st.ToString().c_str() );
delete pHSIncoming;
delete pHSOutgoing;
pHSIncoming = 0;
pHSOutgoing = 0;
pStream->OnConnectError( pSubStreamNum, st );
}
//----------------------------------------------------------------------------
// Handle write timeout
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnWriteTimeout()
{
pStream->OnWriteTimeout( pSubStreamNum );
}
//----------------------------------------------------------------------------
// Handler read timeout
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnReadTimeout()
{
bool isBroken = false;
pStream->OnReadTimeout( pSubStreamNum, isBroken );
if( isBroken )
{
// if we are here it means Stream::OnError has been
// called from inside of Stream::OnReadTimeout, this
// in turn means that the ownership of following
// pointers, has been transfered to the inQueue
if( !pIncHandler.second )
delete pIncoming;
pIncoming = 0;
pOutgoing = 0;
pOutHandler = 0;
}
}
//----------------------------------------------------------------------------
// Handle timeout while handshaking
//----------------------------------------------------------------------------
void AsyncSocketHandler::OnTimeoutWhileHandshaking()
{
time_t now = time(0);
if( now > pConnectionStarted+pConnectionTimeout )
OnFaultWhileHandshaking( Status( stError, errSocketTimeout ) );
}
//------------------------------------------------------------------------
// Get signature for given message
//------------------------------------------------------------------------
Status AsyncSocketHandler::GetSignature( Message *toSign, Message *&sign )
{
// ideally the 'GetSignature' method should be in TransportHandler interface
// however due to ABI compatibility for the time being this workaround has to
// be employed
XRootDTransport *xrootdTransport = dynamic_cast<XRootDTransport*>( pTransport );
if( !xrootdTransport ) return Status( stError, errNotSupported );
return xrootdTransport->GetSignature( toSign, sign, *pChannelData );
}
//------------------------------------------------------------------------
// Initialize the iovec with given message
//------------------------------------------------------------------------
void AsyncSocketHandler::ToIov( Message &msg, iovec &iov )
{
iov.iov_base = msg.GetBufferAtCursor();
iov.iov_len = msg.GetSize() - msg.GetCursor();
}
//------------------------------------------------------------------------
// Update iovec after write
//------------------------------------------------------------------------
void AsyncSocketHandler::UpdateAfterWrite( Message &msg,
iovec &iov,
int &bytesWritten )
{
size_t advance = ( bytesWritten < (int)iov.iov_len ) ? bytesWritten : iov.iov_len;
bytesWritten -= advance;
msg.AdvanceCursor( advance );
ToIov( msg, iov );
}