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XrdClXRootDMsgHandler.cc
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XrdClXRootDMsgHandler.cc
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//------------------------------------------------------------------------------
// Copyright (c) 2011-2014 by European Organization for Nuclear Research (CERN)
// Author: Lukasz Janyst <ljanyst@cern.ch>
//------------------------------------------------------------------------------
// This file is part of the XRootD software suite.
//
// 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/>.
//
// In applying this licence, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
//------------------------------------------------------------------------------
#include "XrdCl/XrdClXRootDMsgHandler.hh"
#include "XrdCl/XrdClLog.hh"
#include "XrdCl/XrdClDefaultEnv.hh"
#include "XrdCl/XrdClConstants.hh"
#include "XrdCl/XrdClXRootDTransport.hh"
#include "XrdCl/XrdClMessage.hh"
#include "XrdCl/XrdClURL.hh"
#include "XrdCl/XrdClUglyHacks.hh"
#include "XrdCl/XrdClUtils.hh"
#include "XrdCl/XrdClTaskManager.hh"
#include "XrdCl/XrdClSIDManager.hh"
#include "XrdCl/XrdClMessageUtils.hh"
#include <arpa/inet.h> // for network unmarshalling stuff
#include "XrdSys/XrdSysPlatform.hh" // same as above
#include <memory>
#include <sstream>
namespace
{
//----------------------------------------------------------------------------
// We need an extra task what will run the handler in the future, because
// tasks get deleted and we need the handler
//----------------------------------------------------------------------------
class WaitTask: public XrdCl::Task
{
public:
WaitTask( XrdCl::XRootDMsgHandler *handler ): pHandler( handler )
{
std::ostringstream o;
o << "WaitTask for: 0x" << handler->GetRequest();
SetName( o.str() );
}
virtual time_t Run( time_t now )
{
pHandler->WaitDone( now );
return 0;
}
private:
XrdCl::XRootDMsgHandler *pHandler;
};
};
namespace XrdCl
{
//----------------------------------------------------------------------------
// Examine an incoming message, and decide on the action to be taken
//----------------------------------------------------------------------------
uint16_t XRootDMsgHandler::Examine( Message *msg )
{
if( msg->GetSize() < 8 )
return Ignore;
ServerResponse *rsp = (ServerResponse *)msg->GetBuffer();
ClientRequest *req = (ClientRequest *)pRequest->GetBuffer();
uint16_t status = 0;
uint32_t dlen = 0;
//--------------------------------------------------------------------------
// We got an async message
//--------------------------------------------------------------------------
if( rsp->hdr.status == kXR_attn )
{
if( msg->GetSize() < 12 )
return Ignore;
//------------------------------------------------------------------------
// We only care about async responses
//------------------------------------------------------------------------
if( rsp->body.attn.actnum != (int32_t)htonl(kXR_asynresp) )
return Ignore;
if( msg->GetSize() < 24 )
return Ignore;
//------------------------------------------------------------------------
// Check if the message has the stream ID that we're interested in
//------------------------------------------------------------------------
ServerResponse *embRsp = (ServerResponse*)msg->GetBuffer(16);
if( embRsp->hdr.streamid[0] != req->header.streamid[0] ||
embRsp->hdr.streamid[1] != req->header.streamid[1] )
return Ignore;
status = ntohs( embRsp->hdr.status );
dlen = ntohl( embRsp->hdr.dlen );
}
//--------------------------------------------------------------------------
// We got a sync message - check if it belongs to us
//--------------------------------------------------------------------------
else
{
if( rsp->hdr.streamid[0] != req->header.streamid[0] ||
rsp->hdr.streamid[1] != req->header.streamid[1] )
return Ignore;
status = rsp->hdr.status;
dlen = rsp->hdr.dlen;
}
//--------------------------------------------------------------------------
// We take the ownership of the message and decide what we will do
// with the handler itself, the options are:
// 1) we want to either read in raw mode (the Raw flag) or have the message
// body reconstructed for us by the TransportHandler by the time
// Process() is called (default, no extra flag)
// 2) we either got a full response in which case we don't want to be
// notified about anything anymore (RemoveHandler) or we got a partial
// answer and we need to wait for more (default, no extra flag)
//--------------------------------------------------------------------------
pResponse = msg;
Log *log = DefaultEnv::GetLog();
switch( status )
{
//------------------------------------------------------------------------
// Handle the cached cases
//------------------------------------------------------------------------
case kXR_error:
case kXR_redirect:
case kXR_wait:
return Take | RemoveHandler;
case kXR_waitresp:
pResponse = 0;
return Take | Ignore; // This must be handled synchronously!
//------------------------------------------------------------------------
// Handle the potential raw cases
//------------------------------------------------------------------------
case kXR_ok:
{
//----------------------------------------------------------------------
// For kXR_read we read in raw mode if we haven't got the full message
// already (handler installed to late and the message has been cached)
//----------------------------------------------------------------------
uint16_t reqId = ntohs( req->header.requestid );
if( reqId == kXR_read && msg->GetSize() == 8 )
{
pReadRawStarted = false;
pAsyncMsgSize = dlen;
return Take | Raw | RemoveHandler;
}
//----------------------------------------------------------------------
// kXR_readv is the same as kXR_read
//----------------------------------------------------------------------
if( reqId == kXR_readv && msg->GetSize() == 8 )
{
pAsyncMsgSize = dlen;
pReadVRawMsgOffset = 0;
return Take | Raw | RemoveHandler;
}
//----------------------------------------------------------------------
// For everything else we just take what we got
//----------------------------------------------------------------------
return Take | RemoveHandler;
}
//------------------------------------------------------------------------
// kXR_oksofars are special, they are not full responses, so we reset
// the response pointer to 0 and add the message to the partial list
//------------------------------------------------------------------------
case kXR_oksofar:
{
log->Dump( XRootDMsg, "[%s] Got a kXR_oksofar response to request "
"%s", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
pResponse = 0;
pPartialResps.push_back( msg );
//----------------------------------------------------------------------
// For kXR_read we either read in raw mode if the message has not
// been fully reconstructed already, if it has, we adjust
// the buffer offset to prepare for the next one
//----------------------------------------------------------------------
uint16_t reqId = ntohs( req->header.requestid );
if( reqId == kXR_read )
{
if( msg->GetSize() == 8 )
{
pReadRawStarted = false;
pAsyncMsgSize = dlen;
return Take | Raw | NoProcess;
}
else
{
pReadRawCurrentOffset += dlen;
return Take | NoProcess;
}
}
//----------------------------------------------------------------------
// kXR_readv is similar to read, except that the payload is different
//----------------------------------------------------------------------
if( reqId == kXR_readv )
{
if( msg->GetSize() == 8 )
{
pAsyncMsgSize = dlen;
pReadVRawMsgOffset = 0;
return Take | Raw | NoProcess;
}
else
return Take | NoProcess;
}
return Take | NoProcess;
}
//------------------------------------------------------------------------
// Default
//------------------------------------------------------------------------
default:
return Take | RemoveHandler;
}
return Take | RemoveHandler;
}
//----------------------------------------------------------------------------
//! Process the message if it was "taken" by the examine action
//----------------------------------------------------------------------------
void XRootDMsgHandler::Process( Message *msg )
{
Log *log = DefaultEnv::GetLog();
ServerResponse *rsp = (ServerResponse *)msg->GetBuffer();
ClientRequest *req = (ClientRequest *)pRequest->GetBuffer();
//--------------------------------------------------------------------------
// We got an async message
//--------------------------------------------------------------------------
if( rsp->hdr.status == kXR_attn )
{
log->Dump( XRootDMsg, "[%s] Got an async response to message %s, "
"processing it", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
Message *embededMsg = new Message( rsp->hdr.dlen-8 );
embededMsg->Append( msg->GetBuffer( 16 ), rsp->hdr.dlen-8 );
XRDCL_SMART_PTR_T<Message> msgPtr( msg );
pResponse = embededMsg; // this can never happen for oksofars
// we need to unmarshall the header by hand
XRootDTransport::UnMarshallHeader( embededMsg );
//------------------------------------------------------------------------
// Check if the dlen field of the embedded message is consistent with
// the dlen value of the original message
//------------------------------------------------------------------------
ServerResponse *embRsp = (ServerResponse *)embededMsg->GetBuffer();
if( embRsp->hdr.dlen != rsp->hdr.dlen-16 )
{
log->Error( XRootDMsg, "[%s] Sizes of the async response to %s and the "
"embedded message are inconsistent. Expected %d, got %d.",
pUrl.GetHostId().c_str(), pRequest->GetDescription().c_str(),
rsp->hdr.dlen-16, embRsp->hdr.dlen);
pStatus = Status( stFatal, errInvalidMessage );
HandleResponse();
return;
}
Process( embededMsg );
return;
}
//--------------------------------------------------------------------------
// We got an answer, check who we were talking to
//--------------------------------------------------------------------------
AnyObject qryResult;
int *qryResponse = 0;
pPostMaster->QueryTransport( pUrl, XRootDQuery::ServerFlags, qryResult );
qryResult.Get( qryResponse );
pHosts->back().flags = *qryResponse; delete qryResponse; qryResponse = 0;
pPostMaster->QueryTransport( pUrl, XRootDQuery::ProtocolVersion, qryResult );
qryResult.Get( qryResponse );
pHosts->back().protocol = *qryResponse; delete qryResponse;
//--------------------------------------------------------------------------
// Process the message
//--------------------------------------------------------------------------
Status st = XRootDTransport::UnMarshallBody( msg, req->header.requestid );
if( !st.IsOK() )
{
pStatus = Status( stFatal, errInvalidMessage );
HandleResponse();
return;
}
switch( rsp->hdr.status )
{
//------------------------------------------------------------------------
// kXR_ok - we're done here
//------------------------------------------------------------------------
case kXR_ok:
{
log->Dump( XRootDMsg, "[%s] Got a kXR_ok response to request %s",
pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
pStatus = Status();
HandleResponse();
return;
}
//------------------------------------------------------------------------
// kXR_error - we've got a problem
//------------------------------------------------------------------------
case kXR_error:
{
char *errmsg = new char[rsp->hdr.dlen-3]; errmsg[rsp->hdr.dlen-4] = 0;
memcpy( errmsg, rsp->body.error.errmsg, rsp->hdr.dlen-4 );
log->Dump( XRootDMsg, "[%s] Got a kXR_error response to request %s "
"[%d] %s", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str(), rsp->body.error.errnum,
errmsg );
delete [] errmsg;
HandleError( Status(stError, errErrorResponse, rsp->body.error.errnum),
pResponse );
return;
}
//------------------------------------------------------------------------
// kXR_redirect - they tell us to go elsewhere
//------------------------------------------------------------------------
case kXR_redirect:
{
XRDCL_SMART_PTR_T<Message> msgPtr( pResponse );
pResponse = 0;
if( rsp->hdr.dlen < 4 )
{
log->Error( XRootDMsg, "[%s] Got invalid redirect response.",
pUrl.GetHostId().c_str() );
pStatus = Status( stError, errInvalidResponse );
HandleResponse();
return;
}
char *urlInfoBuff = new char[rsp->hdr.dlen-3];
urlInfoBuff[rsp->hdr.dlen-4] = 0;
memcpy( urlInfoBuff, rsp->body.redirect.host, rsp->hdr.dlen-4 );
std::string urlInfo = urlInfoBuff;
delete [] urlInfoBuff;
log->Dump( XRootDMsg, "[%s] Got kXR_redirect response to "
"message %s: %s, port %d", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str(), urlInfo.c_str(),
rsp->body.redirect.port );
//----------------------------------------------------------------------
// Check if we can proceed
//----------------------------------------------------------------------
if( !pRedirectCounter )
{
log->Dump( XRootDMsg, "[%s] Redirect limit has been reached for"
"message %s", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
pStatus = Status( stFatal, errRedirectLimit );
HandleResponse();
return;
}
--pRedirectCounter;
//----------------------------------------------------------------------
// Keep the info about this server if we still need to find a load
// balancer
//----------------------------------------------------------------------
if( !pHasLoadBalancer )
{
uint32_t flags = pHosts->back().flags;
if( flags & kXR_isManager )
{
//------------------------------------------------------------------
// If the current server is a meta manager then it supersedes
// any existing load balancer, otherwise we assign a load-balancer
// only if it has not been already assigned
//------------------------------------------------------------------
if( flags & kXR_attrMeta || !pLoadBalancer.url.IsValid() )
{
pLoadBalancer = pHosts->back();
log->Dump( XRootDMsg, "[%s] Current server has been assigned "
"as a load-balancer for message %s",
pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
HostList::iterator it;
for( it = pHosts->begin(); it != pHosts->end(); ++it )
it->loadBalancer = false;
pHosts->back().loadBalancer = true;
}
}
}
//----------------------------------------------------------------------
// Build the URL and check it's validity
//----------------------------------------------------------------------
std::vector<std::string> urlComponents;
std::string newCgi;
Utils::splitString( urlComponents, urlInfo, "?" );
std::ostringstream o;
o << urlComponents[0];
if( rsp->body.redirect.port != -1 )
o << ":" << rsp->body.redirect.port << "/";
URL newUrl = URL( o.str() );
if( !newUrl.IsValid() )
{
pStatus = Status( stError, errInvalidRedirectURL );
log->Error( XRootDMsg, "[%s] Got invalid redirection URL: %s",
pUrl.GetHostId().c_str(), urlInfo.c_str() );
HandleResponse();
return;
}
if( pUrl.GetUserName() != "" && newUrl.GetUserName() == "" )
newUrl.SetUserName( pUrl.GetUserName() );
if( pUrl.GetPassword() != "" && newUrl.GetPassword() == "" )
newUrl.SetPassword( pUrl.GetPassword() );
pUrl = newUrl;
pRedirectUrl = newUrl.GetURL();
URL cgiURL;
if( urlComponents.size() > 1 )
{
std::ostringstream o;
o << "fake://fake:111//fake?";
o << urlComponents[1];
pRedirectUrl += "?";
pRedirectUrl += urlComponents[1];
cgiURL = URL( o.str() );
}
//----------------------------------------------------------------------
// Check if we need to return the URL as a response
//----------------------------------------------------------------------
if( pUrl.GetProtocol() != "root" && pUrl.GetProtocol() != "xroot" )
pRedirectAsAnswer = true;
if( pRedirectAsAnswer )
{
pStatus = Status( stError, errRedirect );
pResponse = msgPtr.release();
HandleResponse();
return;
}
//----------------------------------------------------------------------
// Rewrite the message in a way required to send it to another server
//----------------------------------------------------------------------
Status st = RewriteRequestRedirect( cgiURL.GetParams(),
pUrl.GetPath() );
if( !st.IsOK() )
{
pStatus = st;
HandleResponse();
return;
}
//----------------------------------------------------------------------
// Send the request to the new location
//----------------------------------------------------------------------
pHosts->push_back( pUrl );
pHosts->back().url.SetParams( cgiURL.GetParams() );
HandleError( RetryAtServer(pUrl) );
return;
}
//------------------------------------------------------------------------
// kXR_wait - we wait, and re-issue the request later
//------------------------------------------------------------------------
case kXR_wait:
{
XRDCL_SMART_PTR_T<Message> msgPtr( pResponse );
pResponse = 0;
uint32_t waitSeconds = 0;
if( rsp->hdr.dlen >= 4 )
{
char *infoMsg = new char[rsp->hdr.dlen-3];
infoMsg[rsp->hdr.dlen-4] = 0;
memcpy( infoMsg, rsp->body.wait.infomsg, rsp->hdr.dlen-4 );
log->Dump( XRootDMsg, "[%s] Got kXR_wait response of %d seconds to "
"message %s: %s", pUrl.GetHostId().c_str(),
rsp->body.wait.seconds, pRequest->GetDescription().c_str(),
infoMsg );
delete [] infoMsg;
waitSeconds = rsp->body.wait.seconds;
}
else
{
log->Dump( XRootDMsg, "[%s] Got kXR_wait response of 0 seconds to "
"message %s", pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
}
//----------------------------------------------------------------------
// Some messages require rewriting before they can be sent again
// after wait
//----------------------------------------------------------------------
Status st = RewriteRequestWait();
if( !st.IsOK() )
{
pStatus = st;
HandleResponse();
return;
}
//----------------------------------------------------------------------
// Register a task to resend the message in some seconds, if we still
// have time to do that, and report a timeout otherwise
//----------------------------------------------------------------------
time_t resendTime = ::time(0)+waitSeconds;
if( resendTime < pExpiration )
{
TaskManager *taskMgr = pPostMaster->GetTaskManager();
taskMgr->RegisterTask( new WaitTask( this ), resendTime );
}
else
{
log->Debug( XRootDMsg, "[%s] Wait time is too long, timing out %s",
pUrl.GetHostId().c_str(),
pRequest->GetDescription().c_str() );
pStatus = Status( stError, errOperationExpired );
HandleResponse();
}
return;
}
//------------------------------------------------------------------------
// kXR_waitresp - the response will be returned in some seconds
// as an unsolicited message
//------------------------------------------------------------------------
case kXR_waitresp:
{
XRDCL_SMART_PTR_T<Message> msgPtr( pResponse );
pResponse = 0;
if( rsp->hdr.dlen < 4 )
{
log->Error( XRootDMsg, "[%s] Got invalid waitresp response.",
pUrl.GetHostId().c_str() );
pStatus = Status( stError, errInvalidResponse );
HandleResponse();
return;
}
log->Dump( XRootDMsg, "[%s] Got kXR_waitresp response of %d seconds to "
"message %s", pUrl.GetHostId().c_str(),
rsp->body.waitresp.seconds,
pRequest->GetDescription().c_str() );
return;
}
//------------------------------------------------------------------------
// Default - unrecognized/unsupported response, declare an error
//------------------------------------------------------------------------
default:
{
XRDCL_SMART_PTR_T<Message> msgPtr( pResponse );
pResponse = 0;
log->Dump( XRootDMsg, "[%s] Got unrecognized response %d to "
"message %s", pUrl.GetHostId().c_str(),
rsp->hdr.status, pRequest->GetDescription().c_str() );
pStatus = Status( stError, errInvalidResponse );
HandleResponse();
return;
}
}
return;
}
//----------------------------------------------------------------------------
// Handle an event other that a message arrival - may be timeout
//----------------------------------------------------------------------------
uint8_t XRootDMsgHandler::OnStreamEvent( StreamEvent event,
uint16_t streamNum,
Status status )
{
Log *log = DefaultEnv::GetLog();
log->Dump( XRootDMsg, "[%s] Stream event reported for msg %s",
pUrl.GetHostId().c_str(), pRequest->GetDescription().c_str() );
if( event == Ready )
return 0;
if( streamNum != 0 )
return 0;
HandleError( status, 0 );
return RemoveHandler;
}
//----------------------------------------------------------------------------
// Read message body directly from a socket
//----------------------------------------------------------------------------
Status XRootDMsgHandler::ReadMessageBody( Message *msg,
int socket,
uint32_t &bytesRead )
{
ClientRequest *req = (ClientRequest *)pRequest->GetBuffer();
uint16_t reqId = ntohs( req->header.requestid );
if( reqId == kXR_read )
return ReadRawRead( msg, socket, bytesRead );
if( reqId == kXR_readv )
return ReadRawReadV( msg, socket, bytesRead );
return ReadRawOther( msg, socket, bytesRead );
}
//----------------------------------------------------------------------------
// Handle a kXR_read in raw mode
//----------------------------------------------------------------------------
Status XRootDMsgHandler::ReadRawRead( Message *msg,
int socket,
uint32_t &bytesRead )
{
Log *log = DefaultEnv::GetLog();
//--------------------------------------------------------------------------
// We need to check if we have and overflow, before we start reading
// anything
//--------------------------------------------------------------------------
if( !pReadRawStarted )
{
ChunkInfo chunk = pChunkList->front();
pAsyncOffset = 0;
pAsyncReadSize = pAsyncMsgSize;
pAsyncReadBuffer = ((char*)chunk.buffer)+pReadRawCurrentOffset;
if( pReadRawCurrentOffset + pAsyncMsgSize > chunk.length )
{
log->Error( XRootDMsg, "[%s] Overflow data while reading response to %s"
": expected: %d, got %d bytes",
pUrl.GetHostId().c_str(), pRequest->GetDescription().c_str(),
chunk.length, pReadRawCurrentOffset + pAsyncMsgSize );
pChunkStatus.front().sizeError = true;
pOtherRawStarted = false;
}
else
pReadRawCurrentOffset += pAsyncMsgSize;
pReadRawStarted = true;
}
//--------------------------------------------------------------------------
// If we have an overflow we discard all the incoming data. We do this
// instead of just quitting in order to keep the stream sane.
//--------------------------------------------------------------------------
if( pChunkStatus.front().sizeError )
return ReadRawOther( msg, socket, bytesRead );
//--------------------------------------------------------------------------
// Read the data
//--------------------------------------------------------------------------
return ReadAsync( socket, bytesRead );
}
//----------------------------------------------------------------------------
// Handle a kXR_readv in raw mode
//----------------------------------------------------------------------------
Status XRootDMsgHandler::ReadRawReadV( Message *msg,
int socket,
uint32_t &bytesRead )
{
if( pReadVRawMsgOffset == pAsyncMsgSize )
return Status( stOK, suDone );
Log *log = DefaultEnv::GetLog();
//--------------------------------------------------------------------------
// We've had an error and we are in the discarding mode
//--------------------------------------------------------------------------
if( pReadVRawMsgDiscard )
{
Status st = ReadAsync( socket, bytesRead );
if( st.IsOK() && st.code == suDone )
{
pReadVRawMsgOffset += pAsyncReadSize;
pReadVRawChunkHeaderDone = false;
pReadVRawChunkHeaderStarted = false;
pReadVRawMsgDiscard = false;
delete [] pAsyncReadBuffer;
if( pReadVRawMsgOffset != pAsyncMsgSize )
st.code = suRetry;
log->Dump( XRootDMsg, "[%s] ReadRawReadV: Discarded %d bytes, "
"current offset: %d/%d", pUrl.GetHostId().c_str(),
pAsyncReadSize, pReadVRawMsgOffset, pAsyncMsgSize );
}
return st;
}
//--------------------------------------------------------------------------
// Handle chunk header
//--------------------------------------------------------------------------
if( !pReadVRawChunkHeaderDone )
{
//------------------------------------------------------------------------
// Set up the header reading
//------------------------------------------------------------------------
if( !pReadVRawChunkHeaderStarted )
{
pReadVRawChunkHeaderStarted = true;
//----------------------------------------------------------------------
// We cannot afford to read the next header from the stream because
// we will cross the message boundary
//----------------------------------------------------------------------
if( pReadVRawMsgOffset + 16 > pAsyncMsgSize )
{
uint32_t discardSize = pAsyncMsgSize - pReadVRawMsgOffset;
log->Error( XRootDMsg, "[%s] ReadRawReadV: No enough data to read "
"another chunk header. Discarding %d bytes.",
pUrl.GetHostId().c_str(), discardSize );
pReadVRawMsgDiscard = true;
pAsyncOffset = 0;
pAsyncReadSize = discardSize;
pAsyncReadBuffer = new char[discardSize];
return Status( stOK, suRetry );
}
//----------------------------------------------------------------------
// We set up reading of the next header
//----------------------------------------------------------------------
pAsyncOffset = 0;
pAsyncReadSize = 16;
pAsyncReadBuffer = (char*)&pReadVRawChunkHeader;
}
//------------------------------------------------------------------------
// Do the reading
//------------------------------------------------------------------------
Status st = ReadAsync( socket, bytesRead );
//------------------------------------------------------------------------
// Finalize the header and set everything up for the actual buffer
//------------------------------------------------------------------------
if( st.IsOK() && st.code == suDone )
{
pReadVRawChunkHeaderDone = true;
pReadVRawMsgOffset += 16;
pReadVRawChunkHeader.rlen = ntohl( pReadVRawChunkHeader.rlen );
pReadVRawChunkHeader.offset = ntohll( pReadVRawChunkHeader.offset );
//----------------------------------------------------------------------
// Find the buffer corresponding to the chunk
//----------------------------------------------------------------------
bool chunkFound = false;
for( int i = pReadVRawChunkIndex; i < (int)pChunkList->size(); ++i )
{
if( (*pChunkList)[i].offset == (uint64_t)pReadVRawChunkHeader.offset &&
(*pChunkList)[i].length == (uint32_t)pReadVRawChunkHeader.rlen )
{
chunkFound = true;
pReadVRawChunkIndex = i;
break;
}
}
//----------------------------------------------------------------------
// If the chunk was no found we discard the chunk
//----------------------------------------------------------------------
if( !chunkFound )
{
log->Error( XRootDMsg, "[%s] ReadRawReadV: Impossible to find chunk "
"buffer corresponding to %d bytes at %ld",
pUrl.GetHostId().c_str(), pReadVRawChunkHeader.rlen,
pReadVRawChunkHeader.offset );
uint32_t discardSize = pReadVRawChunkHeader.rlen;
if( pReadVRawMsgOffset + discardSize > pAsyncMsgSize )
discardSize = pAsyncMsgSize - pReadVRawMsgOffset;
pReadVRawMsgDiscard = true;
pAsyncOffset = 0;
pAsyncReadSize = discardSize;
pAsyncReadBuffer = new char[discardSize];
log->Dump( XRootDMsg, "[%s] ReadRawReadV: Discarding %d bytes",
pUrl.GetHostId().c_str(), discardSize );
return Status( stOK, suRetry );
}
//----------------------------------------------------------------------
// The chunk was found, but reading all the data will cross the message
// boundary
//----------------------------------------------------------------------
if( pReadVRawMsgOffset + pReadVRawChunkHeader.rlen > pAsyncMsgSize )
{
uint32_t discardSize = pAsyncMsgSize - pReadVRawMsgOffset;
log->Error( XRootDMsg, "[%s] ReadRawReadV: Malformed chunk header: "
"reading %d bytes from message would cross the message "
"boundary, discarding %d bytes.", pUrl.GetHostId().c_str(),
pReadVRawChunkHeader.rlen, discardSize );
pReadVRawMsgDiscard = true;
pAsyncOffset = 0;
pAsyncReadSize = discardSize;
pAsyncReadBuffer = new char[discardSize];
pChunkStatus[pReadVRawChunkIndex].sizeError = true;
return Status( stOK, suRetry );
}
//----------------------------------------------------------------------
// We're good
//----------------------------------------------------------------------
pAsyncOffset = 0;
pAsyncReadSize = pReadVRawChunkHeader.rlen;
pAsyncReadBuffer = (char*)(*pChunkList)[pReadVRawChunkIndex].buffer;
}
//------------------------------------------------------------------------
// We've seen a reading error
//------------------------------------------------------------------------
if( !st.IsOK() )
return st;
//------------------------------------------------------------------------
// If we are not done reading the header, return back to the event loop.
//------------------------------------------------------------------------
if( st.IsOK() && st.code != suDone )
return st;
}
//--------------------------------------------------------------------------
// Read the body
//--------------------------------------------------------------------------
Status st = ReadAsync( socket, bytesRead );
if( st.IsOK() && st.code == suDone )
{
pReadVRawMsgOffset += pAsyncReadSize;
pReadVRawChunkHeaderDone = false;
pReadVRawChunkHeaderStarted = false;
pChunkStatus[pReadVRawChunkIndex].done = true;
log->Dump( XRootDMsg, "[%s] ReadRawReadV: read buffer for chunk %d@%ld",
pUrl.GetHostId().c_str(),
pReadVRawChunkHeader.rlen, pReadVRawChunkHeader.offset,
pReadVRawMsgOffset, pAsyncMsgSize );
if( pReadVRawMsgOffset < pAsyncMsgSize )
st.code = suRetry;
}
return st;
}
//----------------------------------------------------------------------------
// Handle anything other than kXR_read and kXR_readv in raw mode
//----------------------------------------------------------------------------
Status XRootDMsgHandler::ReadRawOther( Message *msg,
int socket,
uint32_t &bytesRead )
{
if( !pOtherRawStarted )
{
pAsyncOffset = 0;
pAsyncReadSize = pAsyncMsgSize;
pAsyncReadBuffer = new char[pAsyncMsgSize];
pOtherRawStarted = true;
}
Status st = ReadAsync( socket, bytesRead );
if( st.IsOK() && st.code == suRetry )
return st;
delete [] pAsyncReadBuffer;
pAsyncReadBuffer = 0;
pAsyncOffset = pAsyncReadSize = 0;
return st;
}
//--------------------------------------------------------------------------
// Read a buffer asynchronously - depends on pAsyncBuffer, pAsyncSize
// and pAsyncOffset
//--------------------------------------------------------------------------
Status XRootDMsgHandler::ReadAsync( int socket, uint32_t &bytesRead )
{
char *buffer = pAsyncReadBuffer;
buffer += pAsyncOffset;
while( pAsyncOffset < pAsyncReadSize )
{
uint32_t toBeRead = pAsyncReadSize - pAsyncOffset;
int status = ::read( socket, buffer, toBeRead );
if( status < 0 && (errno == EAGAIN || errno == EWOULDBLOCK) )
return Status( stOK, suRetry );
if( status <= 0 )
return Status( stError, errSocketError, errno );
pAsyncOffset += status;
buffer += status;
bytesRead += status;
}
return Status( stOK, suDone );
}
//----------------------------------------------------------------------------
// We're here when we requested sending something over the wire
// and there has been a status update on this action
//----------------------------------------------------------------------------
void XRootDMsgHandler::OnStatusReady( const Message *message,
Status status )
{
Log *log = DefaultEnv::GetLog();
//--------------------------------------------------------------------------
// We were successful, so we now need to listen for a response
//--------------------------------------------------------------------------
if( status.IsOK() )
{
log->Dump( XRootDMsg, "[%s] Message %s has been successfully sent.",
pUrl.GetHostId().c_str(), message->GetDescription().c_str() );
Status st = pPostMaster->Receive( pUrl, this, pExpiration );
if( st.IsOK() )
return;
}
//--------------------------------------------------------------------------
// We have failed, recover if possible
//--------------------------------------------------------------------------
log->Error( XRootDMsg, "[%s] Impossible to send message %s. Trying to "
"recover.", pUrl.GetHostId().c_str(),
message->GetDescription().c_str() );
HandleError( status, 0 );
}
//----------------------------------------------------------------------------
// Are we a raw writer or not?
//----------------------------------------------------------------------------
bool XRootDMsgHandler::IsRaw() const
{
ClientRequest *req = (ClientRequest *)pRequest->GetBuffer();
uint16_t reqId = ntohs( req->header.requestid );
if( reqId == kXR_write )
return true;
return false;
}
//----------------------------------------------------------------------------
// Write the message body
//----------------------------------------------------------------------------
Status XRootDMsgHandler::WriteMessageBody( int socket,
uint32_t &bytesRead )
{
char *buffer = (char*)(*pChunkList)[0].buffer;
uint32_t size = (*pChunkList)[0].length;
uint32_t leftToBeWritten = size-pAsyncOffset;
while( leftToBeWritten )
{
//------------------------------------------------------------------------
// We use send with MSG_NOSIGNAL to avoid SIGPIPEs on Linux
//------------------------------------------------------------------------
#ifdef __linux__
int status = ::send( socket, buffer+pAsyncOffset, leftToBeWritten,
MSG_NOSIGNAL );
#else
int status = ::write( socket, buffer+pAsyncOffset, leftToBeWritten );
#endif
if( status <= 0 )
{