1 31ba2236 2022-01-05 thomas /*
 2 31ba2236 2022-01-05 thomas  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
 3 31ba2236 2022-01-05 thomas  *
 4 31ba2236 2022-01-05 thomas  * Permission to use, copy, modify, and distribute this software for any
 5 31ba2236 2022-01-05 thomas  * purpose with or without fee is hereby granted, provided that the above
 6 31ba2236 2022-01-05 thomas  * copyright notice and this permission notice appear in all copies.
 7 31ba2236 2022-01-05 thomas  *
 8 31ba2236 2022-01-05 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 31ba2236 2022-01-05 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 31ba2236 2022-01-05 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 31ba2236 2022-01-05 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 31ba2236 2022-01-05 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 31ba2236 2022-01-05 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 31ba2236 2022-01-05 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 31ba2236 2022-01-05 thomas  */
16 31ba2236 2022-01-05 thomas 
17 31ba2236 2022-01-05 thomas #include <sys/time.h>
18 31ba2236 2022-01-05 thomas 
19 31ba2236 2022-01-05 thomas #include <stdio.h>
20 31ba2236 2022-01-05 thomas #include <limits.h>
21 31ba2236 2022-01-05 thomas #include <string.h>
22 31ba2236 2022-01-05 thomas #include <time.h>
23 31ba2236 2022-01-05 thomas 
24 31ba2236 2022-01-05 thomas #include "got_lib_ratelimit.h"
25 31ba2236 2022-01-05 thomas 
26 de1dbfe9 2022-01-05 thomas #include "got_compat.h"
27 31ba2236 2022-01-05 thomas #include "got_error.h"
28 31ba2236 2022-01-05 thomas 
29 31ba2236 2022-01-05 thomas void
30 31ba2236 2022-01-05 thomas got_ratelimit_init(struct got_ratelimit *rl, time_t interval_sec,
31 31ba2236 2022-01-05 thomas     unsigned int interval_msec)
32 31ba2236 2022-01-05 thomas {
33 31ba2236 2022-01-05 thomas 	memset(rl, 0, sizeof(*rl));
34 31ba2236 2022-01-05 thomas 	rl->interval.tv_sec = interval_sec;
35 31ba2236 2022-01-05 thomas 	rl->interval.tv_nsec = interval_msec * 1000000UL;
36 31ba2236 2022-01-05 thomas }
37 31ba2236 2022-01-05 thomas 
38 31ba2236 2022-01-05 thomas const struct got_error *
39 31ba2236 2022-01-05 thomas got_ratelimit_check(int *elapsed, struct got_ratelimit *rl)
40 31ba2236 2022-01-05 thomas {
41 31ba2236 2022-01-05 thomas 	struct timespec now, delta;
42 31ba2236 2022-01-05 thomas 
43 31ba2236 2022-01-05 thomas 	if (clock_gettime(CLOCK_MONOTONIC, &now) == -1)
44 31ba2236 2022-01-05 thomas 		return got_error_from_errno("clock_gettime");
45 31ba2236 2022-01-05 thomas 
46 31ba2236 2022-01-05 thomas 	if (timespecisset(&rl->last)) {
47 31ba2236 2022-01-05 thomas 		timespecsub(&now, &rl->last, &delta);
48 31ba2236 2022-01-05 thomas 		*elapsed = timespeccmp(&delta, &rl->interval, >=) ? 1 : 0;
49 31ba2236 2022-01-05 thomas 	} else
50 31ba2236 2022-01-05 thomas 		*elapsed = 1;
51 31ba2236 2022-01-05 thomas 
52 31ba2236 2022-01-05 thomas 	if (*elapsed)
53 31ba2236 2022-01-05 thomas 		rl->last = now;
54 31ba2236 2022-01-05 thomas 
55 31ba2236 2022-01-05 thomas 	return NULL;
56 31ba2236 2022-01-05 thomas }