// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// Main log server engine.
// Process log requests from multiple clients simultaneously.
//
//
/**
@file server.cpp
*/
#include "server.h"
CLogServer* CLogServer::NewL()
/**
* @return - Instance of the log server
*/
{
CLogServer * server = new (ELeave) CLogServer();
CleanupStack::PushL(server);
server->ConstructL();
// CServer base class call
server->StartL(KFileLogrerServerName);
CleanupStack::Pop(server);
return server;
}
void CLogServer::ConstructL()
/**
* Second phase construction
*/
{
User::LeaveIfError(Fs().Connect());
}
CLogServer::CLogServer() : CServer2(EPriorityStandard,ESharableSessions)
/**
* Constructor
*/
{
}
CLogServer::~CLogServer()
/**
* Destructor
*/
{
// Close the array of control structures
LogControl().Close();
Fs().Close();
}
CSession2* CLogServer::NewSessionL(const TVersion& /*aVersion*/,const RMessage2& /*aMessage*/) const
/**
* @param RMessage - RMessage for the session open
*/
{
// Just create the session
CLogSession* session = new (ELeave) CLogSession();
return session;
}
void CLogServer::ControlComplete(CLogFileControl& aControl)
/**
* @param aControl - Logfile control class reference
*
* Checks to see if this control session can be removed
*/
{
// Check session count and the data buffers on the queue
if(aControl.SessionCount() || !aControl.QueueEmpty())
return;
// There are no subsessions mapped to the logfile control class and
// no data buffers on its write queue
// Loop through the server's control array and remove it then delete it
TInt i;
for(i=0;i<LogControl().Count();i++)
{
if(&aControl == LogControl()[i])
{
// Done
LogControl().Remove(i);
delete &aControl;
break;
}
}
// If it's the last one then exit the server
if(!LogControl().Count())
CActiveScheduler::Stop();
}
///////
CLogSession::CLogSession()
/**
* Constructor
*/
{
}
CLogSession::~CLogSession()
/**
* Destructor
*/
{
// Check for null
// Session close without a createlog call leaves iControl null
if(!iControl)
return;
// A logfile control structure can have multiple server sessions
// decrement its server session count
iControl->RemoveSession();
CLogServer* p=(CLogServer*) Server();
// Shuts Down the server if this is the last open session
p->ControlComplete(*iControl);
}
void CLogSession::ServiceL(const RMessage2& aMessage)
/**
* @param aMessage - Function and data for the session
*/
{
switch(aMessage.Function())
{
// API CreateLog() call
case RFileFlogger::ECreateLog :
{
// Sanity check to make sure it's not been called multiple times
if(iControl)
{
aMessage.Complete(KErrInUse);
break;
}
// Get the filepath
// size policed on the client side
TBuf<KMaxLoggerFilePath> logFilePath;
// Read it
aMessage.ReadL(0,logFilePath);
// Get the log mode in the second argument
RFileFlogger::TLogMode logMode;
logMode = (RFileFlogger::TLogMode)aMessage.Int1();
// Get a pointer to the parent server
CLogServer* server=(CLogServer*) Server();
// For compare's convert the whole path to lower case
logFilePath.LowerCase();
// Get rid of leading and trailing spaces.
logFilePath.Trim();
// Loop the through the server's logfile control class list
// to see if there's a match.
TInt i;
for(i=0;i<server->LogControl().Count();i++)
{
if(server->LogControl()[i]->LogFile() == logFilePath)
// This file's already in open so we don't have to open it
break;
}
TInt err = KErrNone;
// Check the count
if(i < server->LogControl().Count())
// Map this session to an existing logfile control class in the list
iControl = server->LogControl()[i];
else
{
// Create a new logfile control class
// creates/opens the logfile
TRAP(err,iControl = CLogFileControl::NewL(*server,logFilePath,logMode));
if(!err)
{ // nancy
// find out the type of output format and assign to this new created control
TInt error = logFilePath.Find(_L(".xml"));
if(error==KErrNotFound) iControl->SetLogType(CLogFileControl::ETxt);
else iControl->SetLogType(CLogFileControl::EXml);
// end nancy
// Append it to the logfile control class list
server->LogControl().Append(iControl);
}
}
if(!err)
// Increment its session count
iControl->AddSession();
aMessage.Complete(err);
}
break;
// One of the API write calls
case RFileFlogger::EWriteLog :
{
// Sanity check
if(!iControl)
{
aMessage.Complete(KErrNotFound);
break;
}
// Data can be any size
// Get the length from second argument
TInt bufferLength = aMessage.Int1();
// Get a heap buffer of the right size
HBufC8* buffer = HBufC8::NewLC(bufferLength);
TPtr8 ptr(buffer->Des());
// read the data
aMessage.ReadL(0,ptr);
// Get a buffer control class contructed with the heap data
// takes ownership
CLogBuffer* logBuffer = new (ELeave) CLogBuffer(*buffer);
CleanupStack::Pop(buffer);
// Add it to the logfile control class buffer queue
iControl->AddLogBuffer(*logBuffer);
if(!iControl->IsActive())
// AO is idle, kick into life
iControl->Kick();
aMessage.Complete(KErrNone);
}
break;
default:
break;
}
}
///////
CLogFileControl* CLogFileControl::NewL(CLogServer& aParent, const TDesC& aLogFilePath,RFileFlogger::TLogMode aMode)
/**
* @param aParent - Server reference for callback
* @param aLogFilePath - Full path and filename of the logfile
* @param aMode - Overwrite or Append
*
* First phase construction for logfile control class
*/
{
CLogFileControl* self = new (ELeave) CLogFileControl(aParent,aLogFilePath);
CleanupStack::PushL(self);
self->ConstructL(aMode);
CleanupStack::Pop();
return self;
}
CLogFileControl::CLogFileControl(CLogServer& aParent,const TDesC& aLogFilePath) :
iParent(aParent),
iLogFileName(aLogFilePath),
iTransmitted(EFalse)
/**
* @param aParent - Server reference for callback
* @param aLogFilePath - Full path and filename of the logfile
*
* Constructor - Safe initialisation
*/
{
iQueue.SetOffset(CLogBuffer::LinkOffset());
}
void CLogFileControl::ConstructL(RFileFlogger::TLogMode aMode)
/**
* @param aMode - Overwrite or Append
*
* Second phase construction - Create or open the logfile
*/
{
if(aMode == RFileFlogger::ELogModeOverWrite)
// In overwrite mode replace
User::LeaveIfError(iLogFile.Replace(iParent.Fs(),iLogFileName,EFileWrite));
else
{
// For append try open then replace
TInt err = iLogFile.Open(iParent.Fs(),iLogFileName,EFileWrite);
if(err != KErrNone)
// Bomb out if replace fails
User::LeaveIfError(iLogFile.Replace(iParent.Fs(),iLogFileName,EFileWrite));
else
{
// Open worked. Position at EOF
TInt pos;
iLogFile.Size(pos);
User::LeaveIfError(iLogFile.Seek(ESeekEnd,pos));
}
}
}
CLogFileControl::~CLogFileControl()
/**
* Destructor
* The server maintains a list of these classes and will not destruct one if there
* is data on its queue
* Destructor just closes the file handle.
*/
{
iLogFile.Close();
}
void CLogFileControl::RunL()
/**
* Main File writing pump
* Called on write completion or Kick() by the session that accepts the data
*/
{
#if (defined _DEBUG)
_LIT(KPanic,"LogEng RunL()");
#endif
__ASSERT_DEBUG(iStatus.Int() == KErrNone,User::Panic(KPanic,iStatus.Int()));
// Check to see if this is the result of write completion
if(iTransmitted)
{
// Write completed
// Remove the buffer at the head of the queue and free it
CLogBuffer* buffer = iQueue.First();
iQueue.Remove(*buffer);
delete buffer;
}
// Check to see if there's more on the queue
if(!iQueue.IsEmpty())
{
// There is so write the head of the queue
CLogBuffer* buffer = iQueue.First();
SetActive();
// Set the flag to say we've transmitted
iTransmitted = ETrue;
// ------------------------------------
if(iLogFormat==ETxt) WriteTxt(buffer->Buf());
else WriteXml(buffer->Buf());
}
else
{
// Nothing on the queue
iTransmitted = EFalse;
// Call into the server to check if this resource can be freed
iParent.ControlComplete(*this);
}
}
void CLogFileControl::WriteXml(const TDesC8 &aDes)
/**
* @param aDes - send a aDes string in xml format to a log file
*/
{
/*--------- Maintaince Warning: -----------------------------------
******* the fomat of below is sensible from client original format.
******* Any change should match actual string formated from client.
******* Double check the code on client side
* The current assumtion of format:
* First string values are seperated by sign " - " and extra pair of fields are
* seperated from main log message by long unusual string "LogFieldsRequiredBeingAddedToAboveLogMessage"
* The \t used to seperate field name and field value and \r\n used to seperate
* each other from those pairs of field
* \t\t\t\t\t\t is used to end of whole string
--------------------------------------------------------------------------------*/
_LIT8(KxmlHeader,"<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\r\n<LOGFILE>");
//The order of variables:
// time - aTime
// Severity - aSeverity
// Thread - aThread
// Filename - aFilename
// Linenumber - aLinenumber
// Text - aText
// Start of string retrive/deformating
HBufC8* pBuf1 = HBufC8::New(KMaxLoggerLineLength*2); //(aDes.Length()+200);
if(!pBuf1)
{
return; // no memory
}
TPtr8 aPtr(pBuf1->Des()); // used for searching
TPtr8 alogbuf(pBuf1->Des()); //used for final log
aPtr.Append(aDes);
TPtrC8 SearchBuf;
TInt aCount[8];
aCount[0]=0;
TInt posI(0);
// retrive log message:
// Retrive common part of log message:
TInt i=0;
for(i=1; i<6; i++)
{
SearchBuf.Set(aPtr.Mid(posI));
aCount[i]=SearchBuf.Find(KSeperation8)+posI;
posI=aCount[i]+3;
if(aCount[i]<aCount[i-1])
{
delete pBuf1;
return; // wrong format string from client
}
}
// seperating common log message and extra log fields will be easy for future maintaince.
TLogField8* alogField = new TLogField8[6]; // the common part of log message for both
// with and without extra log fields
if(!alogField)
{
delete pBuf1;
return; // no memory
}
TLogField8* extralogField=NULL; // only applied to extra log fields
TInt alength=0; // a length of array of extra log fields
alogField[0].iLogTag8.Copy(_L8("TIME"));
alogField[1].iLogTag8.Copy(_L8("SEVERITY"));
alogField[2].iLogTag8.Copy(_L8("THREAD"));
alogField[3].iLogTag8.Copy(_L8("FILENAME"));
alogField[4].iLogTag8.Copy(_L8("LINENUMBER"));
alogField[5].iLogTag8.Copy(_L8("TEXT"));
alogField[0].iLogValue8.Copy(aPtr.Mid(aCount[0],aCount[1]-aCount[0]));
for(i=1; i<5; i++)
{
alogField[i].iLogValue8.Copy(aPtr.Mid(aCount[i]+3,aCount[i+1]-aCount[i]-3));
}
SearchBuf.Set(aPtr.Mid(posI));
aCount[6]=SearchBuf.Find(_L8("LogFieldsRequiredBeingAddedToAboveLogMessage"))+posI;
if(aCount[6]<posI) // no addtional fields. Find return value is KErrNotFound or >0
{
alogField[5].iLogValue8.Copy(aPtr.Mid(aCount[5]+3,aDes.Length()-aCount[5]-5));
}
else
{
alogField[5].iLogValue8.Copy(aPtr.Mid(aCount[5]+3,aCount[6]-aCount[5]-5));
posI=aCount[6]+45; //45 is from the length of long string and a tab
SearchBuf.Set(aPtr.Mid(posI));
aCount[7]=SearchBuf.Find(_L8("\r\n"))+posI;
TLex8 lex(aPtr.Mid(posI,aCount[7]-posI)); // get the length
TInt err=lex.Val(alength);
if (err)
alength=0; // ignor the extra log fields. Let the log go
// Retrive the extra log fields
extralogField = new TLogField8[alength];
if(!extralogField)
{
delete pBuf1;
return; // no memory
}
for(TInt i=0; i<alength; i++)
{
aCount[6]=aCount[7]+2;
SearchBuf.Set(aPtr.Mid(aCount[6]));
aCount[7]=SearchBuf.Find(_L8("\t"))+aCount[6];
extralogField[i].iLogTag8.Copy(aPtr.Mid(aCount[6],aCount[7]-aCount[6]));
aCount[6]=aCount[7]+1;
SearchBuf.Set(aPtr.Mid(aCount[6]));
aCount[7]=SearchBuf.Find(_L8("\r\n"))+aCount[6];
extralogField[i].iLogValue8.Copy(aPtr.Mid(aCount[6],aCount[7]-aCount[6]));
}
}
// Start to organize an XML format:
TInt afileSize;
_LIT(KLogMutex, "LoggingServerMutex");
RMutex mutex;
TInt r = mutex.CreateGlobal(KLogMutex);
if(r==KErrAlreadyExists)
r = mutex.OpenGlobal(KLogMutex);
if(!r)
mutex.Wait(); // If still failed, let logging go without bother the mutex.
iLogFile.Size(afileSize);
if(afileSize<12) // 12 is from charters of "\r\n</LOGFILE>"
//It shoud happened once at the beginning of the file
// such as overwrite mode
{
afileSize=12; // used for lock position
alogbuf.Copy(KxmlHeader);
}
alogbuf.Append(_L8("\r\n<MESSAGE>\r\n"));
for(TInt i=0; i<6; i++)
{
alogbuf.Append(_L8(" <"));
alogbuf.Append(alogField[i].iLogTag8);
alogbuf.Append(_L8(">"));
alogbuf.Append(alogField[i].iLogValue8);
alogbuf.Append(_L8("</"));
alogbuf.Append(alogField[i].iLogTag8);
alogbuf.Append(_L8(">\r\n"));
}
for(TInt i=0; i<alength; i++)
{
alogbuf.Append(_L8(" <"));
alogbuf.Append(extralogField[i].iLogTag8);
alogbuf.Append(_L8(">"));
alogbuf.Append(extralogField[i].iLogValue8);
alogbuf.Append(_L8("</"));
alogbuf.Append(extralogField[i].iLogTag8);
alogbuf.Append(_L8(">\r\n"));
}
alogbuf.Append(_L8("</MESSAGE>"));
alogbuf.Append(_L8("\r\n</LOGFILE>"));
iLogFile.Write(afileSize-12, alogbuf,iStatus);
if(!r)
{
mutex.Signal();
mutex.Close();
}
if(extralogField)
delete[] extralogField;
delete[] alogField;
delete pBuf1;
}
void CLogFileControl::WriteTxt(const TDesC8 &aDes)
/**
* @param aDes - send a aDes string in xml format to a log file
*/
{
/*--------- Maintaince Warning for aLogBuffer -----------------------------------
******* the fomat of below is sensible from client original format.
******* Any change should match actual string formated from client.
******* Double check the code on client side
* The current assumtion of format:
* First string values are seperated by sign " - " and extra pair of fields are
* seperated from main log message by long unusual string "LogFieldsRequiredBeingAddedToAboveLogMessage"
* The \t used to seperate field name and field value and \r\n used to seperate
* each other from those pairs of field
--------------------------------------------------------------------------------*/
iLogFile.Write(aDes,iStatus);
}
///////
CLogBuffer::CLogBuffer(HBufC8& aLogBuffer) : iLogBuffer(aLogBuffer)
/**
* @param aLogBuffer - Heap descriptor. This class takes ownership
* Constructor
*/
{
}
CLogBuffer::~CLogBuffer()
/**
* Destructor
* This class owns a heap buffer so just free it
*/
{
delete &iLogBuffer;
}