_piobj.cpp

mini http server,可以集成嵌入到程序中,实现简单的web功能

/*____________________________________________________________________________*\
 *

 Copyright (c) 1997-2003 John Roy, Holger Zimmermann. All rights reserved.

 These sources, libraries and applications are
 FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 as long as the following conditions are adhered to.

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    notice, this list of conditions and the following disclaimer. 

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

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 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *____________________________________________________________________________*|
 *
 * $Source: /cvsroot/pi3web/Pi3Web_200/Source/Pi2API/_PIObj.cpp,v $
 * $Date: 2003/05/13 18:42:09 $
 *
 Description:
\*____________________________________________________________________________*/
//$SourceTop:$

#include <ctype.h>

#include "StrToken.h"
#include "_PIObj.h"
#include "AutoDel.h"
#include "PIStrStr.h"
#include "_PIDBUtl.h"
#include "DeQuote.h"

/*____________________________________________________________________________*\
 *
 Function:
 Synopsis:
 Description:
\*____________________________________________________________________________*/
_PIObject *_PIObject::Load( PIDB *pDB, PIConfigDB *pConfig,
	const char *pObjectName, int iArgc, const char *ppArgv[] )
{
	assert( pDB && pObjectName );

	PIConfigDB *pConf = PIConfigDB::LookupObjectWithName( pDB, pConfig, 
		pObjectName );

	if ( !pConf )
		{   
		PIOStrStream os;
		os << "Unable to load object '" << pObjectName << "', configuration \
definition could not be found." << ends;
		_PIDBUtil::AddLogMessage( pDB, pConfig, PILOG_ERROR, os.str() );
		return 0;
		};

	/* --- get the name of the class --- */
	const char *pClassName = PIConfigDB::LookupValue( pConf, 
		PIDBKEY_CONF_CLASS, 0, 0 );

	if ( !pClassName )
		{
		PIOStrStream os;
		os << "Unable to load object '" << pObjectName << "', configuration \
definition is missing a definition for the object's 'Class'." << ends;
		_PIDBUtil::AddLogMessage( pDB, pConfig, PILOG_ERROR, os.str() );
		return 0;
		};

	const _PIClass *pClass = _PIClass::LookupOrLoad( pDB, pConfig, pClassName );
	if ( !pClass )
		{
		return 0;
		};

	/* --- correct the name the of object, wrt case --- */
	pObjectName = PIConfigDB::LookupValue( pConf, PIDBKEY_CONF_NAME, 0, 0 );

	/* --- 
	Check for object attributes
	NOTE: This is antiquated 
	--- */
	const char *pTmp = PIConfigDB::LookupValue( pConf, PIDBKEY_CONF_ATTRIBUTE,
		0, 0 );
	bool bHasTree = pTmp && !pi_stricmp( pTmp, PIDBVALUE_CONF_HASTREE );

#if 0
	/* ---
	Check for nested objects
	NOTE: Removed because its antiquated 
	--- */
	_PIDBIterator *pIter = 0;
	AutoDelete<_PIDBIterator> tA( pIter = pConf->GetIterator( 
		PIDBTYPE_CONF_STRING, PIDBKEY_CONF_OBJECT, 0 ) );
	for(; pIter && pIter->AtValidElement(); pIter->Next() )
		{
		PIConfigDBString *pString = (PIConfigDBString *)pIter->Current( 0 );
		if ( !pString ) { continue; };
		const char *pValue = pString->GetString();
		};
#endif

	if ( bHasTree )
		{
		pDB = PI_NEW( PIDBTree( pDB, pObjectName ) );
		};

	_PIObject *pObj = PI_NEW( _PIObject( pObjectName, pClass, pDB, pConf ) );
	if ( pClass->Constructor( pObj, iArgc, ppArgv ) )
		{
		PIOStrStream os;
		os << "Failed to initialize object '" << pObj->GetName()
			<< "' of class '" << pClass->GetName() << "'." << ends;
		_PIDBUtil::AddLogMessage( pDB, pConfig, PILOG_ERROR, os.str() );
		Delete( pObj, 0, 0 );
		pObj = 0;
		if ( bHasTree )
			{
			pDB->Detach();
			PI_DELETE( pDB );
			};
		};
	return pObj;
}

/*____________________________________________________________________________*\
 *
 Function:
 Synopsis:
 Description:
\*____________________________________________________________________________*/
_PIObject *_PIObject::LoadFromLine( PIDB *pDB, PIConfigDB *pConfigDB,
	const char *pObjectLine )
{
	if ( !pObjectLine )
		{
		assert( 0 );
		return 0;
		};

	if ( !pDB || !pConfigDB )
		{
		PILog_addMessage( pDB, pConfigDB, PILOG_ERROR, "\
Object has no DB or Configuration DB" );
		return 0;
		};

	StringTokenizer tTokens( pObjectLine, " ", 0 );
	int iNumTokens = tTokens.NumTokens();
	if ( iNumTokens<1 )
		{
		PIOStrStream os;
		os << "Object line is empty" << ends;
		PILog_addMessage( pDB, pConfigDB, PILOG_ERROR, os.str() );
		return 0;
		};
	const char *pObjectName = tTokens.GetToken( 0 );
	int iArgc = iNumTokens-1;
	char **ppArgv = 0;
	if ( iArgc>0 )
		{
		ppArgv = PI_NEW( char *[iArgc] ); 
		for( int i=0; i<iArgc; i++ )
			{
			ppArgv[i] = (char *)(const char *)tTokens.GetToken( i+1 );
			};
		};

	PIObject *pNewObject = Load( pDB, 0, pObjectName, iArgc,
		(const char **)ppArgv ); 
	PI_DELETE( [] ppArgv );
	if ( !pNewObject )
		{
		/* --- Message generated by Load() --- */
		return 0;
		};

	return pNewObject;
}

/*____________________________________________________________________________*\
 *
 Function:
 Synopsis:
 Description:
\*____________________________________________________________________________*/
_PIObject *_PIObject::LoadEx( const _PIObject *pObject,
	const char *pObjectKey )
{
	if ( !pObject || !pObjectKey )
		{
		assert( 0 );
		return 0;
		};

	PIDB *pDB = PIObject_getDB( pObject );
	PIConfigDB *pConfigDB = PIObject_getConfigurationDB( pObject );
	if ( !pDB || !pConfigDB )
		{
		PILog_addMessage( pDB, pConfigDB, PILOG_ERROR, "\
Object has no DB or Configuration DB" );
		return 0;
		};
	const char *pObjectLine = PIConfig_lookupValue( pConfigDB,
		pObjectKey, 0, 0 );
	if ( !pObjectLine )
		{
		PIOStrStream os;
		os << "No definition for '" << pObjectKey << "'" << ends; 
		PILog_addMessage( pDB, pConfigDB, PILOG_ERROR, os.str() );
		return 0;
		};

	return _PIObject::LoadFromLine( pDB, pConfigDB, pObjectLine );
}

/*____________________________________________________________________________*\
 *
 Function:
 Synopsis:
 Description:
\*____________________________________________________________________________*/
#define CONFIG_ERR(this, msg)   \
	{ PILog_addMessage( PIObject_getDB(this), \
	PIObject_getConfigurationDB(this), PILOG_ERROR, (msg) ); }
int _PIObject::ReadParameters(
	PIObject *pObject,
	int iArgc,
	const char *ppArgv[],
	int (* fnParameter)( void *, const char *, const char *, const char *),
	void *pParam )
{
	assert( pObject && fnParameter );
	if ( !( pObject && fnParameter ) )
		{
		return 0;
		};

	/* --- loop over parameters passed on line --- */
	if ( ppArgv )
		{
		for( int i=0; i<iArgc; i++ )
			{
			const char *pLine = ppArgv[i];
			if ( !pLine )
				{ continue; };
	
			/* --- remove leading whitespace --- */
			for( ; (isspace(*pLine)); pLine++ );
			
			int j=0;

			/* --- scan to first '=' --- */
			for( ; pLine[j] && pLine[j]!='='; j++ );  

			/* --- grap variable name --- */
			PIString sVariable( pLine, j );

			/* --- skip the '=' --- */
			if ( pLine[j] )
				{ j++; };
			
			DeQuote tUnQuoted( &(pLine[j]) );

			if ( !(fnParameter)( pParam, sVariable, tUnQuoted, "" ) )
				{
				return 0;	
				};
			};
		};

	PIDBIterator *pIter = PIDB_getIterator(
		(PIDB *)PIObject_getConfigurationDB( pObject ),
		PIDBTYPE_USER, 0, 0 );
	
	if ( !pIter ) 
		{
		CONFIG_ERR( pObject, "Could not read values for object" );
		PIDBIterator_delete( pIter );
		return 0;
		};

	for(; PIDBIterator_atValidElement( pIter ); PIDBIterator_next( pIter ))
		{
		const char *pVariable = 0;