Veritas NetBackup™ DataStore SDK Programmer's Guide for XBSA 1.1.0

Restore example

Here is an example of a restore. It assumes that the object descriptor has been populated with the copyId of the object either from a query or the XBSA application having stored this information.

BSA_Handle                        BsaHandle;
BSA_ObjectOwner                   BsaObjectOwner;
BSA_SecurityToken                 *security_tokenPtr;
BSA_DataBlock32                   *data_block;
BSA_UInt32                        EnvBufSz = 512;
BSA_ObjectDescriptor              *object_desc;
BSA_QueryDescriptor               *query_desc;
BSA_UInt32                        Size;
char                              *envx[3];
char                              EnvBuf[512];
char                              ErrorString[512];
char                              msg[1024];
char                              *restore_location;
int                               total_bytes = 0;
int                               status;
.
.
BSAInit(&BsaHandle, security_tokenPtr, &BsaObjectOwner, envx);
.
.
BSABeginTxn(BsaHandle);

/ *  Get the object.  */
 
data_block = (BSA_DataBlock32 *)malloc(sizeof(BSA_DataBlock32));
 
status = BSAGetObject(BsaHandle, object_desc, data_block);
if (status != BSA_RC_SUCCESS) {
    Size = 512;
    NBBSAGetErrorString(status, &Size, ErrorString);
    sprintf(msg, "ERROR: BSAQueryObject() failed with error: %s", ErrorString);
    NBBSALogMsg(BsaHandle, MSERROR, msg, "Restore");
    BSAEndTxn(BsaHandle, BSA_Vote_ABORT);
    BSATerminate(BsaHandle);
    exit(status);
}
 
/ * The application is responsible for recreating the file or other object   *
/ * type that is being restored using the information that is stored in the  *
/ * object_descriptor.  This sample prints the results to the screen.        */
 
restore_location = (char *)malloc((EnvBufSz + 1) * sizeof(char));
memset(restore_location, 0x00, EnvBufSz + 1); 
 
/ * Initialize the data_block structure.  */
 
data_block->bufferLen = EnvBufSz;
data_block->bufferPtr = EnvBuf;
memset(data_block->bufferPtr, 0x00, EnvBufSz);
 
/ * Read data until the end of data. */
 
while ((status = BSAGetData(BsaHandle, data_block)) == BSA_RC_SUCCESS) {
 
    / * Move the retrieved data to where it is to be restored to and  *
      * reset the data_block buffer.                                  */

    memcpy(restore_location, data_block->bufferPtr, data_block->numBytes);
    total_bytes += data_block->numBytes;
 
    printf("%s", restore_location);
 
    memset(restore_location, 0x00, EnvBufSz + 1);
    memset(data_block->bufferPtr, 0x00, EnvBufSz);
}    
if (status == BSA_RC_NO_MORE_DATA) {
     
    / * The last BSAGetData() that returns BSA_RC_NO_MORE_DATA may have data  *
      * in the buffer.                                                        */
     
    memcpy(restore_location, data_block->bufferPtr, data_block->numBytes);
    total_bytes += data_block->numBytes;
 
    printf("%s\n", restore_location);
    printf("Total bytes retrieved: %d\n", total_bytes);
} else {
    Size = 512;
    NBBSAGetErrorString(status, &Size, ErrorString);
    sprintf(msg, "ERROR: BSAGetData() failed with error: %s", ErrorString);
    NBBSALogMsg(BsaHandle, MSERROR, msg, "Restore");
    BSAEndTxn(BsaHandle, BSA_Vote_ABORT);
    BSATerminate(BsaHandle);
    exit(status);
}
  
/ * Done retrieving data. */
 
status = BSAEndData(BsaHandle);
if (status != BSA_RC_SUCCESS) {
    Size = 512;
    NBBSAGetErrorString(status, &Size, ErrorString);
    sprintf(msg, "ERROR: BSAEndData() failed with error: %s", ErrorString);
    NBBSALogMsg(BsaHandle, MSERROR, msg, "Restore");
    BSAEndTxn(BsaHandle, BSA_Vote_ABORT);
    BSATerminate(BsaHandle);
    exit(status);
}
  
/ * End the restore transaction.  BSA_Vote_COMMIT and BSA_Vote_ABORT are         *
/ * equivalent as there is nothing to commit or abort for a restore transaction. */
 
status = BSAEndTxn(BsaHandle, BSA_Vote_COMMIT);
if (status != BSA_RC_SUCCESS) {
    Size = 512;
    NBBSAGetErrorString(status, &Size, ErrorString);
    sprintf(msg, "ERROR: BSAEndTxn() failed with error: %s", ErrorString);
    NBBSALogMsg(BsaHandle, MSERROR, msg, "Restore");
    BSATerminate(BsaHandle);
    exit(status);
}