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Small optimization in query_usestale

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This commit makes the code in query_usestale easier to follow, it also
doesn't attach/detach to the database if stale answers are not enabled.
This commit is contained in:
Diego Fronza
2021-01-12 12:59:21 -03:00
parent 42c789c763
commit f89ac07b28
1 changed files with 5 additions and 30 deletions
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35
lib/ns/query.c
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@@ -7368,45 +7368,20 @@ root_key_sentinel_return_servfail(query_ctx_t *qctx, isc_result_t result) {
*/
static bool
query_usestale(query_ctx_t *qctx) {
bool staleanswersok = false;
dns_ttl_t stale_ttl = 0;
isc_result_t result;
qctx_clean(qctx);
qctx_freedata(qctx);
/*
* Stale answers only make sense if stale_ttl > 0 but we want rndc to
* be able to control returning stale answers if they are configured.
*/
dns_db_attach(qctx->client->view->cachedb, &qctx->db);
result = dns_db_getservestalettl(qctx->db, &stale_ttl);
if (result == ISC_R_SUCCESS && stale_ttl > 0) {
switch (qctx->client->view->staleanswersok) {
case dns_stale_answer_yes:
staleanswersok = true;
break;
case dns_stale_answer_conf:
staleanswersok = qctx->client->view->staleanswersenable;
break;
case dns_stale_answer_no:
staleanswersok = false;
break;
}
} else {
staleanswersok = false;
}
if (staleanswersok) {
if (dns_view_staleanswerenabled(qctx->client->view)) {
dns_db_attach(qctx->client->view->cachedb, &qctx->db);
qctx->client->query.dboptions |= DNS_DBFIND_STALEOK;
if (qctx->client->query.fetch != NULL) {
dns_resolver_destroyfetch(&qctx->client->query.fetch);
}
} else {
dns_db_detach(&qctx->db);
return (true);
}
return (staleanswersok);
return (false);
}
/*%