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/* Definition of the generic obj class module.
*
* This module relies heavily on preprocessor macros in order to
* provide fast execution time AND ease of use.
*
* Each object that uses this base class MUST provide a constructor with
* the following interface:
*
* Destruct(pThis);
*
* A constructor is not necessary (except for some features, e.g. de-serialization).
* If it is provided, it is a three-part constructor (to handle all cases with a
* generic interface):
*
* Construct(&pThis);
* SetProperty(pThis, property_t *);
* ConstructFinalize(pThis);
*
* SetProperty() and ConstructFinalize() may also be called on an object
* instance which has been Construct()'ed outside of this module.
*
* pThis always references to a pointer of the object.
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#ifndef OBJ_H_INCLUDED
#define OBJ_H_INCLUDED
#include "stringbuf.h"
/* property types */
typedef enum { /* do NOT start at 0 to detect uninitialized types after calloc() */
PROPTYPE_PSZ = 1,
PROPTYPE_SHORT = 2,
PROPTYPE_INT = 3,
PROPTYPE_LONG = 4,
PROPTYPE_CSTR = 5,
PROPTYPE_SYSLOGTIME = 6
} propertyType_t;
typedef struct {
rsCStrObj *pcsName;
propertyType_t propType;
union {
short vShort;
int vInt;
long vLong;
rsCStrObj *vpCStr; /* used for both rsCStr and psz */
syslogTime_t vSyslogTime;
} val;
} property_t;
/* object Types/IDs */
typedef enum { /* IDs of known object "types/classes" */
OBJNull = 0, /* no valid object (we do not start at zero so we can detect calloc()) */
OBJMsg = 1,
OBJstrm = 2
} objID_t;
#define OBJ_NUM_IDS 3
typedef enum { /* IDs of base methods supported by all objects - used for jump table, so
* they must start at zero and be incremented. -- rgerahrds, 2008-01-04
*/
objMethod_CONSTRUCT = 0,
objMethod_DESTRUCT = 1,
objMethod_SERIALIZE = 2,
objMethod_DESERIALIZE = 3,
objMethod_SETPROPERTY = 4,
objMethod_CONSTRUCTION_FINALIZER = 5,
objMethod_DEBUGPRINT = 6
} objMethod_t;
#define OBJ_NUM_METHODS 7 /* must be updated to contain the max number of methods supported */
typedef struct objInfo_s {
objID_t objID;
int iObjVers;
uchar *pszName;
rsRetVal (*objMethods[OBJ_NUM_METHODS])();
} objInfo_t;
typedef struct obj { /* the dummy struct that each derived class can be casted to */
objInfo_t *pObjInfo;
} obj_t;
/* the following structure is used for deserialization. It defines a serial storage with a single
* ungetc() capability. This should probably become its own object some time. -- rgerhards, 2008-01-07
*/
typedef struct serialStore_s {
void *pUsr; /* Pointer to some user data */
/* methods */
rsRetVal (*funcGetChar)(void*, uchar*);
rsRetVal (*funcUngetChar)(void*, uchar);
} serialStore_t;
#define serialStoreGetChar(pThis, c) (pThis->funcGetChar(pThis->pUsr, c))
#define serialStoreUngetChar(pThis, c) (pThis->funcUngetChar(pThis->pUsr, c))
/* macros */
/* the following one is a helper that prevents us from writing the
* ever-same code at the end of Construct()
*/
#define OBJCONSTRUCT_CHECK_SUCCESS_AND_CLEANUP \
if(iRet == RS_RET_OK) { \
*ppThis = pThis; \
} else { \
if(pThis != NULL) \
free(pThis); \
}
#define objSerializeSCALAR(propName, propType) \
CHKiRet(objSerializeProp(pCStr, (uchar*) #propName, PROPTYPE_##propType, (void*) &pThis->propName));
#define objSerializePTR(propName, propType) \
CHKiRet(objSerializeProp(pCStr, (uchar*) #propName, PROPTYPE_##propType, (void*) pThis->propName));
#define DEFobjStaticHelpers static objInfo_t *pObjInfoOBJ = NULL;
#define BEGINobjInstance objInfo_t *pObjInfo
#define objGetName(pThis) (((obj_t*) (pThis))->pObjInfo->pszName)
#define objGetObjID(pThis) (((obj_t*) (pThis))->pObjInfo->objID)
#define objGetVersion(pThis) (((obj_t*) (pThis))->pObjInfo->iObjVers)
/* must be called in Constructor: */
#define objConstructSetObjInfo(pThis) ((obj_t*) (pThis))->pObjInfo = pObjInfoOBJ;
#define objDestruct(pThis) (((obj_t*) (pThis))->pObjInfo->objMethods[objMethod_DESTRUCT])(pThis)
#define objSerialize(pThis) (((obj_t*) (pThis))->pObjInfo->objMethods[objMethod_SERIALIZE])
/* class initializer */
#define PROTOTYPEObjClassInit(objName) rsRetVal objName##ClassInit(void)
#define BEGINObjClassInit(objName, objVers) \
rsRetVal objName##ClassInit(void) \
{ \
DEFiRet; \
CHKiRet(objInfoConstruct(&pObjInfoOBJ, OBJ##objName, (uchar*) #objName, objVers, \
(rsRetVal (*)(void*))objName##Construct, (rsRetVal (*)(void*))objName##Destruct));
#define ENDObjClassInit(objName) \
objRegisterObj(OBJ##objName, pObjInfoOBJ); \
finalize_it: \
return iRet; \
}
#define OBJSetMethodHandler(methodID, pHdlr) \
CHKiRet(objInfoSetMethod(pObjInfoOBJ, methodID, (rsRetVal (*)(void*)) pHdlr))
/* prototypes */
rsRetVal objInfoConstruct(objInfo_t **ppThis, objID_t objID, uchar *pszName, int iObjVers, rsRetVal (*pConstruct)(void *), rsRetVal (*pDestruct)(void *));
rsRetVal objInfoSetMethod(objInfo_t *pThis, objMethod_t objMethod, rsRetVal (*pHandler)(void*));
rsRetVal objBeginSerialize(rsCStrObj **ppCStr, obj_t *pObj, size_t iExpectedObjSize);
rsRetVal objSerializePsz(rsCStrObj *pCStr, uchar *psz, size_t len);
rsRetVal objEndSerialize(rsCStrObj **ppCStr, obj_t *pObj);
rsRetVal objSerializeProp(rsCStrObj *pCStr, uchar *pszPropName, propertyType_t propType, void *pUsr);
rsRetVal objRegisterObj(objID_t oID, objInfo_t *pInfo);
rsRetVal objDeserialize(void *ppObj, objID_t objTypeExpected, serialStore_t *pSerStore);
PROTOTYPEObjClassInit(obj);
#endif /* #ifndef OBJ_H_INCLUDED */
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