/*
 * Long-running ThemWi daemon processes need to be able to pick up updates
 * to the number database without being restarted.  Whenever they need to
 * consult the number db when handling a new call setup or equivalent,
 * they will call refresh_number_db(), which does a stat on the file,
 * followed by a re-read if the file has changed.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>

#include <themwi/nanp/number_db_v2.h>
#include <themwi/nanp/number_lookup.h>

extern const char numdb_pathname[];
extern struct stat numdb_file_stat;
extern struct owned_number_rec *numdb_owned_numbers;
extern struct short_number_rec *numdb_short_numbers;

int refresh_number_db(void)
{
	int rc;
	struct stat st;

	rc = stat(numdb_pathname, &st);
	if (rc < 0) {
		syslog(LOG_CRIT, "unable to stat %s for refresh: %m",
			numdb_pathname);
		return(-1);
	}
	if (st.st_mtime == numdb_file_stat.st_mtime &&
	    st.st_ctime == numdb_file_stat.st_ctime &&
	    st.st_size  == numdb_file_stat.st_size)
		return(0);
	if (numdb_owned_numbers) {
		free(numdb_owned_numbers);
		numdb_owned_numbers = 0;
	}
	if (numdb_short_numbers) {
		free(numdb_short_numbers);
		numdb_short_numbers = 0;
	}
	rc = read_number_db();
	if (rc < 0) {
		syslog(LOG_CRIT, "error reading %s on refresh!",
			numdb_pathname);
		exit(1);
	}
	return(1);
}