resolve: reuse timer event source for DnsQuery

If the query get CNAME or DNAME, then the query will be restarted.
Even in that case, previously, the event source was freed and allocated
again. Let's slightly optimize it.

diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index 192bfd3bf5682bf90719a6a144a98efd83079c0a..9b296e7aa67a95e01bce50273187d0fc3687679c 100644 (file)
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -3,6 +3,7 @@
 #include "alloc-util.h"
 #include "dns-domain.h"
 #include "dns-type.h"
+#include "event-util.h"
 #include "hostname-util.h"
 #include "local-addresses.h"
 #include "resolved-dns-query.h"
@@ -348,7 +349,7 @@ static void dns_query_stop(DnsQuery *q) {
 
         assert(q);
 
-        q->timeout_event_source = sd_event_source_disable_unref(q->timeout_event_source);
+        event_source_disable(q->timeout_event_source);
 
         LIST_FOREACH(candidates_by_query, c, q->candidates)
                 dns_query_candidate_stop(c);
@@ -794,17 +795,16 @@ int dns_query_go(DnsQuery *q) {
 
         dns_query_reset_answer(q);
 
-        r = sd_event_add_time_relative(
+        r = event_reset_time_relative(
                         q->manager->event,
                         &q->timeout_event_source,
                         clock_boottime_or_monotonic(),
                         SD_RESOLVED_QUERY_TIMEOUT_USEC,
-                        0, on_query_timeout, q);
+                        0, on_query_timeout, q,
+                        0, "query-timeout", true);
         if (r < 0)
                 goto fail;
 
-        (void) sd_event_source_set_description(q->timeout_event_source, "query-timeout");
-
         q->state = DNS_TRANSACTION_PENDING;
         q->block_ready++;