/* this function returns the next available record read
* if the input_queue (i.e. list of files connected from
* an external source) or the reader_cqueue (i.e. list
* of bgpdump currently open) are empty then it
* triggers a mechanism to populate the queues or
* return 0 if nothing is available
*/
int bgpstream_get_next_record(bgpstream_t *bs,
bgpstream_record_t *record) {
bgpstream_debug("BS: get next");
if(bs == NULL || (bs != NULL && bs->status != BGPSTREAM_STATUS_ON)) {
return -1; // wrong status
}
int num_query_results = 0;
bgpstream_input_t *bs_in = NULL;
// if bs_record contains an initialized bgpdump entry we destroy it
bgpstream_record_clear(record);
while(bgpstream_reader_mgr_is_empty(bs->reader_mgr)) {
bgpstream_debug("BS: reader mgr is empty");
// get new data to process and set the reader_mgr
while(bgpstream_input_mgr_is_empty(bs->input_mgr)) {
bgpstream_debug("BS: input mgr is empty");
/* query the external source and append new
* input objects to the input_mgr queue */
num_query_results =
bgpstream_datasource_mgr_update_input_queue(bs->datasource_mgr,
bs->input_mgr);
if(num_query_results == 0){
bgpstream_debug("BS: no (more) data are available");
return 0; // no (more) data are available
}
if(num_query_results < 0){
bgpstream_debug("BS: error during datasource_mgr_update_input_queue");
return -1; // error during execution
}
bgpstream_debug("BS: got results from datasource");
}
bgpstream_debug("BS: input mgr not empty");
bs_in = bgpstream_input_mgr_get_queue_to_process(bs->input_mgr);
bgpstream_reader_mgr_add(bs->reader_mgr, bs_in, bs->filter_mgr);
bgpstream_input_mgr_destroy_queue(bs_in);
bs_in = NULL;
}
bgpstream_debug("BS: reader mgr not empty");
/* init the record with a pointer to bgpstream */
record->bs = bs;
return bgpstream_reader_mgr_get_next_record(bs->reader_mgr, record,
bs->filter_mgr);
}
/* allocate memory for a bs_record */
bgpstream_record_t *bgpstream_record_create()
{
bgpstream_debug("BS: create record start");
bgpstream_record_t *bs_record;
if ((bs_record = (bgpstream_record_t *)malloc(sizeof(bgpstream_record_t))) ==
NULL) {
return NULL; // can't allocate memory
}
bs_record->bs = NULL;
bs_record->bd_entry = NULL;
if ((bs_record->elem_generator = bgpstream_elem_generator_create()) == NULL) {
bgpstream_record_destroy(bs_record);
return NULL;
}
bgpstream_record_clear(bs_record);
bgpstream_debug("BS: create record end");
return bs_record;
}