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Overview
Comment:Add API to register a compression-factory method with an lsm handle.
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SHA1:60908fd4d12c0678a8cd1462a4e66d680ebd7c11
User & Date: dan 2013-02-06 19:43:37
Context
2013-02-07
19:50
Add the INFO_COMPRESSION_ID request. And the factory method for providing compression/encryption functions. Leaf check-in: bb85de9cd3 user: dan tags: compression-id
2013-02-06
19:43
Add API to register a compression-factory method with an lsm handle. check-in: 60908fd4d1 user: dan tags: compression-id
19:03
Add a field to the database header to identify the compression scheme in use. check-in: 3bf1db9709 user: dan tags: compression-id
Changes
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Changes to src/lsmInt.h. 

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  /* Worker context */
  Snapshot *pWorker;              /* Worker snapshot (or NULL) */
  Freelist *pFreelist;            /* See sortedNewToplevel() */
  int bUseFreelist;               /* True to use pFreelist */
  int bIncrMerge;                 /* True if currently doing a merge */



  /* Debugging message callback */
  void (*xLog)(void *, int, const char *);
  void *pLogCtx;

  /* Work done notification callback */
  void (*xWork)(lsm_db *, void *);
  void *pWorkCtx;
................................................................................
int lsmFreelistAppend(lsm_env *pEnv, Freelist *p, int iBlk, i64 iId);

int lsmDbMultiProc(lsm_db *);
void lsmDbDeferredClose(lsm_db *, lsm_file *, LsmFile *);
LsmFile *lsmDbRecycleFd(lsm_db *);

int lsmWalkFreelist(lsm_db *, int, int (*)(void *, int, i64), void *);




/**************************************************************************
** functions in lsm_str.c
*/
void lsmStringInit(LsmString*, lsm_env *pEnv);
int lsmStringExtend(LsmString*, int);








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  /* Worker context */
  Snapshot *pWorker;              /* Worker snapshot (or NULL) */
  Freelist *pFreelist;            /* See sortedNewToplevel() */
  int bUseFreelist;               /* True to use pFreelist */
  int bIncrMerge;                 /* True if currently doing a merge */

  int bInFactory;                 /* True if within factory.xFactory() */

  /* Debugging message callback */
  void (*xLog)(void *, int, const char *);
  void *pLogCtx;

  /* Work done notification callback */
  void (*xWork)(lsm_db *, void *);
  void *pWorkCtx;
................................................................................
int lsmFreelistAppend(lsm_env *pEnv, Freelist *p, int iBlk, i64 iId);

int lsmDbMultiProc(lsm_db *);
void lsmDbDeferredClose(lsm_db *, lsm_file *, LsmFile *);
LsmFile *lsmDbRecycleFd(lsm_db *);

int lsmWalkFreelist(lsm_db *, int, int (*)(void *, int, i64), void *);

int lsmCheckCompressionId(lsm_db *, u32);


/**************************************************************************
** functions in lsm_str.c
*/
void lsmStringInit(LsmString*, lsm_env *pEnv);
int lsmStringExtend(LsmString*, int);

Changes to src/lsm_ckpt.c. 

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      return LSM_PROTOCOL;
    }
  }

  rc = lsmCheckpointDeserialize(pDb, 1, pShm->aSnap1, &pDb->pWorker);
  if( pDb->pWorker ) pDb->pWorker->pDatabase = pDb->pDatabase;

  if( rc==LSM_OK && pDb->pWorker->iCmpId!=pDb->compress.iId ){
    lsmFreeSnapshot(pDb->pEnv, pDb->pWorker);
    rc = LSM_MISMATCH;
    pDb->pWorker = 0;
  }

#if 0
  assert( rc!=LSM_OK || lsmFsIntegrityCheck(pDb) );
#endif
  return rc;
}








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      return LSM_PROTOCOL;
    }
  }

  rc = lsmCheckpointDeserialize(pDb, 1, pShm->aSnap1, &pDb->pWorker);
  if( pDb->pWorker ) pDb->pWorker->pDatabase = pDb->pDatabase;

  if( rc==LSM_OK ){
    rc = lsmCheckCompressionId(pDb, pDb->pWorker->iCmpId);


  }

#if 0
  assert( rc!=LSM_OK || lsmFsIntegrityCheck(pDb) );
#endif
  return rc;
}

Changes to src/lsm_main.c. 

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        pDb->bMultiProc = *piVal = (*piVal!=0);
      }
      break;
    }

    case LSM_CONFIG_SET_COMPRESSION: {
      lsm_compress *p = va_arg(ap, lsm_compress *);
      if( pDb->iReader>=0 ){
        /* May not change compression schemes with an open transaction */
        rc = LSM_MISUSE_BKPT;
      }else{




        if( p->xBound==0 ){
          memset(&pDb->compress, 0, sizeof(lsm_compress));
          pDb->compress.iId = LSM_COMPRESSION_NONE;
        }else{
          memcpy(&pDb->compress, p, sizeof(lsm_compress));
        }
        rc = lsmFsConfigure(pDb);








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        pDb->bMultiProc = *piVal = (*piVal!=0);
      }
      break;
    }

    case LSM_CONFIG_SET_COMPRESSION: {
      lsm_compress *p = va_arg(ap, lsm_compress *);
      if( pDb->iReader>=0 && pDb->bInFactory==0 ){
        /* May not change compression schemes with an open transaction */
        rc = LSM_MISUSE_BKPT;
      }else{
        if( pDb->compress.xFree ){
          /* Invoke any destructor belonging to the current compression. */
          pDb->compress.xFree(pDb->compress.pCtx);
        }
        if( p->xBound==0 ){
          memset(&pDb->compress, 0, sizeof(lsm_compress));
          pDb->compress.iId = LSM_COMPRESSION_NONE;
        }else{
          memcpy(&pDb->compress, p, sizeof(lsm_compress));
        }
        rc = lsmFsConfigure(pDb);

Changes to src/lsm_shared.c. 

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/*
** Called when recovery is finished.
*/
int lsmFinishRecovery(lsm_db *pDb){
  lsmTreeEndTransaction(pDb, 1);
  return LSM_OK;
}















/*
** Begin a read transaction. This function is a no-op if the connection
** passed as the only argument already has an open read transaction.
*/
int lsmBeginReadTrans(lsm_db *pDb){
  const int MAX_READLOCK_ATTEMPTS = 10;
................................................................................
          assert( (rc==LSM_OK)==(pDb->pClient!=0) );
          assert( pDb->iReader>=0 );

          /* Check that the client has the right compression hooks loaded.
          ** If not, set rc to LSM_MISMATCH.  */
          assert( rc!=LSM_OK || pDb->pClient->iCmpId!=LSM_COMPRESSION_EMPTY );
          if( rc==LSM_OK && pDb->pClient->iCmpId!=pDb->compress.iId ){
            rc = LSM_MISMATCH;
          }
        }else{
          rc = lsmReleaseReadlock(pDb);
        }
      }

      if( rc==LSM_BUSY ){








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/*
** Called when recovery is finished.
*/
int lsmFinishRecovery(lsm_db *pDb){
  lsmTreeEndTransaction(pDb, 1);
  return LSM_OK;
}

int lsmCheckCompressionId(lsm_db *pDb, u32 iReq){
  if( pDb->compress.iId!=iReq ){
    if( pDb->factory.xFactory ){
      pDb->bInFactory = 1;
      pDb->factory.xFactory(pDb->factory.pCtx, pDb, iReq);
      pDb->bInFactory = 0;
    }
    if( pDb->compress.iId!=iReq ){
      return LSM_MISMATCH;
    }
  }
  return LSM_OK;
}

/*
** Begin a read transaction. This function is a no-op if the connection
** passed as the only argument already has an open read transaction.
*/
int lsmBeginReadTrans(lsm_db *pDb){
  const int MAX_READLOCK_ATTEMPTS = 10;
................................................................................
          assert( (rc==LSM_OK)==(pDb->pClient!=0) );
          assert( pDb->iReader>=0 );

          /* Check that the client has the right compression hooks loaded.
          ** If not, set rc to LSM_MISMATCH.  */
          assert( rc!=LSM_OK || pDb->pClient->iCmpId!=LSM_COMPRESSION_EMPTY );
          if( rc==LSM_OK && pDb->pClient->iCmpId!=pDb->compress.iId ){
            rc = lsmCheckCompressionId(pDb, pDb->pClient->iCmpId);
          }
        }else{
          rc = lsmReleaseReadlock(pDb);
        }
      }

      if( rc==LSM_BUSY ){

Changes to test/lsm4.test. 

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  db config {set_compression rle}
  list [catch {db_fetch db 1} msg] $msg
} {1 {error in lsm_csr_open() - 50}}

do_test 1.4 {
  db close
  lsm_open db test.db 
breakpoint
  list [catch {db_fetch db 1} msg] $msg
} {1 {error in lsm_csr_open() - 50}}








finish_test









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  db config {set_compression rle}
  list [catch {db_fetch db 1} msg] $msg
} {1 {error in lsm_csr_open() - 50}}

do_test 1.4 {
  db close
  lsm_open db test.db 

  list [catch {db_fetch db 1} msg] $msg
} {1 {error in lsm_csr_open() - 50}}

do_test 1.5 {
  db config {set_compression_factory true}
  list [db_fetch db 1] [db_fetch db 2]
} {abc def}



finish_test

Changes to test/test_lsm.c. 

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  Tcl_ResetResult(interp);
  return TCL_OK;
}

static int testConfigureSetCompression(
  Tcl_Interp *interp, 
  lsm_db *db, 
  Tcl_Obj *pCmp

){
  struct CompressionScheme {
    const char *zName;
    lsm_compress cmp;
  } aCmp[] = {
    { "encrypt", { 0, 43, 
        testCompressEncBound, testCompressEncCompress,
................................................................................
        testCompressNoopUncompress, testCompressNoopFree
    } },
    { 0, {0, 0, 0, 0, 0, 0} }
  };
  int iOpt;
  int rc;


  rc = Tcl_GetIndexFromObjStruct(
      interp, pCmp, aCmp, sizeof(aCmp[0]), "scheme", 0, &iOpt
  );
  if( rc!=TCL_OK ) return rc;








  rc = lsm_config(db, LSM_CONFIG_SET_COMPRESSION, &aCmp[iOpt].cmp);
























  return rc;
}

static int testConfigureLsm(Tcl_Interp *interp, lsm_db *db, Tcl_Obj *pObj){
  struct Lsmconfig {
    const char *zOpt;
    int eOpt;
  } aConfig[] = {
    { "autoflush",        LSM_CONFIG_AUTOFLUSH },
    { "page_size",        LSM_CONFIG_PAGE_SIZE },
    { "block_size",       LSM_CONFIG_BLOCK_SIZE },
    { "safety",           LSM_CONFIG_SAFETY },
    { "autowork",         LSM_CONFIG_AUTOWORK },
    { "autocheckpoint",   LSM_CONFIG_AUTOCHECKPOINT },
    { "mmap",             LSM_CONFIG_MMAP },
    { "use_log",          LSM_CONFIG_USE_LOG },
    { "automerge",        LSM_CONFIG_AUTOMERGE },
    { "max_freelist",     LSM_CONFIG_MAX_FREELIST },
    { "multi_proc",       LSM_CONFIG_MULTIPLE_PROCESSES },
    { "set_compression",  LSM_CONFIG_SET_COMPRESSION },

    { 0, 0 }
  };
  int nElem;
  int i;
  Tcl_Obj **apElem;
  int rc;

................................................................................
        Tcl_ResetResult(interp);
        Tcl_AppendResult(interp, "option \"", Tcl_GetString(apElem[i]), 
            "\" requires an argument", 0
            );
        rc = TCL_ERROR;
      }else{
        if( aConfig[iOpt].eOpt==LSM_CONFIG_SET_COMPRESSION ){
          rc = testConfigureSetCompression(interp, db, apElem[i+1]);



        }
        else {
          int iVal;
          rc = Tcl_GetIntFromObj(interp, apElem[i+1], &iVal);
          if( rc==TCL_OK ){
            lsm_config(db, aConfig[iOpt].eOpt, &iVal);
          }








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  Tcl_ResetResult(interp);
  return TCL_OK;
}

static int testConfigureSetCompression(
  Tcl_Interp *interp, 
  lsm_db *db, 
  Tcl_Obj *pCmp,
  unsigned int iId
){
  struct CompressionScheme {
    const char *zName;
    lsm_compress cmp;
  } aCmp[] = {
    { "encrypt", { 0, 43, 
        testCompressEncBound, testCompressEncCompress,
................................................................................
        testCompressNoopUncompress, testCompressNoopFree
    } },
    { 0, {0, 0, 0, 0, 0, 0} }
  };
  int iOpt;
  int rc;

  if( interp ){
    rc = Tcl_GetIndexFromObjStruct(
        interp, pCmp, aCmp, sizeof(aCmp[0]), "scheme", 0, &iOpt
        );
    if( rc!=TCL_OK ) return rc;
  }else{
    int nOpt = sizeof(aCmp)/sizeof(aCmp[0]);
    for(iOpt=0; iOpt<nOpt; iOpt++){
      if( iId==aCmp[iOpt].cmp.iId ) break;
    }
    if( iOpt==nOpt ) return 0;
  }

  rc = lsm_config(db, LSM_CONFIG_SET_COMPRESSION, &aCmp[iOpt].cmp);
  return rc;
}

static int testCompressFactory(void *pCtx, lsm_db *db, unsigned int iId){
  return testConfigureSetCompression(0, db, 0, iId);
}

static int testConfigureSetFactory(
  Tcl_Interp *interp, 
  lsm_db *db, 
  Tcl_Obj *pArg
){
  lsm_compress_factory aFactory[2] = {
    { 0, 0, 0 },
    { 0, testCompressFactory, 0 },
  };
  int bArg = 0;
  int rc;

  rc = Tcl_GetBooleanFromObj(interp, pArg, &bArg);
  if( rc!=TCL_OK ) return rc;
  assert( bArg==1 || bArg==0 );

  rc = lsm_config(db, LSM_CONFIG_SET_COMPRESSION_FACTORY, &aFactory[bArg]);
  return rc;
}

static int testConfigureLsm(Tcl_Interp *interp, lsm_db *db, Tcl_Obj *pObj){
  struct Lsmconfig {
    const char *zOpt;
    int eOpt;
  } aConfig[] = {
    { "autoflush",               LSM_CONFIG_AUTOFLUSH },
    { "page_size",               LSM_CONFIG_PAGE_SIZE },
    { "block_size",              LSM_CONFIG_BLOCK_SIZE },
    { "safety",                  LSM_CONFIG_SAFETY },
    { "autowork",                LSM_CONFIG_AUTOWORK },
    { "autocheckpoint",          LSM_CONFIG_AUTOCHECKPOINT },
    { "mmap",                    LSM_CONFIG_MMAP },
    { "use_log",                 LSM_CONFIG_USE_LOG },
    { "automerge",               LSM_CONFIG_AUTOMERGE },
    { "max_freelist",            LSM_CONFIG_MAX_FREELIST },
    { "multi_proc",              LSM_CONFIG_MULTIPLE_PROCESSES },
    { "set_compression",         LSM_CONFIG_SET_COMPRESSION },
    { "set_compression_factory", LSM_CONFIG_SET_COMPRESSION_FACTORY },
    { 0, 0 }
  };
  int nElem;
  int i;
  Tcl_Obj **apElem;
  int rc;

................................................................................
        Tcl_ResetResult(interp);
        Tcl_AppendResult(interp, "option \"", Tcl_GetString(apElem[i]), 
            "\" requires an argument", 0
            );
        rc = TCL_ERROR;
      }else{
        if( aConfig[iOpt].eOpt==LSM_CONFIG_SET_COMPRESSION ){
          rc = testConfigureSetCompression(interp, db, apElem[i+1], 0);
        }
        else if( aConfig[iOpt].eOpt==LSM_CONFIG_SET_COMPRESSION_FACTORY ){
          rc = testConfigureSetFactory(interp, db, apElem[i+1]);
        }
        else {
          int iVal;
          rc = Tcl_GetIntFromObj(interp, apElem[i+1], &iVal);
          if( rc==TCL_OK ){
            lsm_config(db, aConfig[iOpt].eOpt, &iVal);
          }

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