[Minor] Add function to reschedule events at specific timer

src/libutil/libev_helper.c

@@ -108,4 +108,34 @@ void rspamd_ev_watcher_reschedule(struct ev_loop *loop,
 			ev_timer_start(EV_A, &ev->tm);
 		}
 	}
+}
+
+void rspamd_ev_watcher_reschedule_at(struct ev_loop *loop,
+									 struct rspamd_io_ev *ev,
+									 short what,
+									 ev_tstamp at)
+{
+	g_assert(ev->cb != NULL);
+
+	if (ev_can_stop(&ev->io)) {
+		ev_io_stop(EV_A, &ev->io);
+		ev_io_set(&ev->io, ev->io.fd, what);
+		ev_io_start(EV_A, &ev->io);
+	}
+	else {
+		ev->io.data = ev;
+		ev_io_init(&ev->io, rspamd_ev_watcher_io_cb, ev->io.fd, what);
+		ev_io_start(EV_A, &ev->io);
+	}
+
+	if (at > 0) {
+		if (!(ev_can_stop(&ev->tm))) {
+			/* Update timestamp to avoid timers running early */
+			ev_now_update_if_cheap(loop);
+
+			ev->tm.data = ev;
+			ev_timer_init(&ev->tm, rspamd_ev_watcher_timer_cb, at, 0.0);
+			ev_timer_start(EV_A, &ev->tm);
+		}
+	}
 }

src/libutil/libev_helper.h

@@ -1,11 +1,11 @@
-/*-
- * Copyright 2019 Vsevolod Stakhov
+/*
+ * Copyright 2024 Vsevolod Stakhov
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *   http://www.apache.org/licenses/LICENSE-2.0
+ *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -79,6 +79,17 @@ void rspamd_ev_watcher_reschedule(struct ev_loop *loop,
 								  struct rspamd_io_ev *ev,
 								  short what);
 
+/**
+ * Convenience function to reschedule watcher with different events and different timeout
+ * @param loop
+ * @param ev
+ * @param what
+ */
+void rspamd_ev_watcher_reschedule_at(struct ev_loop *loop,
+									 struct rspamd_io_ev *ev,
+									 short what,
+									 ev_tstamp at);
+
 #ifdef __cplusplus
 }
 #endif