unsigned char* CassandraFS::read_block(CassUuid* physical_file_id, int block, int* bytes_read) {
CassStatement* statement = cass_statement_new("SELECT data, size FROM file_blocks WHERE physical_file_id = ? AND block_number = ?", 2);
cass_statement_bind_uuid(statement, 0, *physical_file_id);
cass_statement_bind_int32(statement, 1, block);
unsigned char* return_data = NULL;
CassFuture* result_future = cass_session_execute(ctxt->session, statement);
cass_statement_free(statement);
if (cass_future_error_code(result_future) == CASS_OK) {
const CassResult* result = cass_future_get_result(result_future);
CassIterator* rows = cass_iterator_from_result(result);
if (cass_iterator_next(rows)) {
const CassRow* row = cass_iterator_get_row(rows);
const CassValue* data_value = cass_row_get_column_by_name(row, "data");
const CassValue* size_value = cass_row_get_column_by_name(row, "size");
const cass_byte_t* cass_data;
size_t size;
int size2;
cass_value_get_bytes(data_value, &cass_data, &size);
cass_value_get_int32(size_value, &size2);
// Let's use the value from "size" field unless bigger than the actual data.
if (size2>size) {
warning("Problem: size field is showing value %d which is bigger than the actual block data length %zu", size2, size);
size2 = size;
}
return_data = (unsigned char*)malloc(size2);
memcpy(return_data, cass_data, size2);
(*bytes_read) = size2;
}
cass_result_free(result);
cass_iterator_free(rows);
} else {
/* Handle error */
cassandra_log_error(result_future);
}
cass_future_free(result_future);
return return_data;
}
static CassError get(const CassValue* value, CassBytes* output) {
return cass_value_get_bytes(value, &output->data, &output->size);
}
