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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "lib/defines.h"
#include "lib/utils.h"
#include <libknot/libknot.h>
#include <lmdb.h>
#include "kresconfig.h"
#include "kr_cache_gc.h"
static volatile int killed = 0;
static volatile int exit_code = 0;
static void got_killed(int signum)
{
(void)signum;
switch (++killed) {
case 1:
break;
case 2:
exit_code = 5;
break;
default:
abort();
}
}
static void print_help(void)
{
printf("Usage: kr_cache_gc -c <resolver_cache> [ optional params... ]\n");
printf("Optional params:\n");
printf(" -d <garbage_interval(millis)>\n");
printf(" -l <deletes_per_txn>\n");
printf(" -L <reads_per_txn>\n");
printf(" -m <rw_txn_duration(usecs)>\n");
printf(" -u <cache_max_usage(percent)>\n");
printf(" -f <cache_to_be_freed(percent-of-current-usage)>\n");
printf(" -w <wait_next_rw_txn(usecs)>\n");
printf(" -t <temporary_memory(MBytes)>\n");
printf(" -n (= dry run)\n");
}
static long get_nonneg_optarg(void)
{
char *end;
const long result = strtol(optarg, &end, 10);
if (result >= 0 && end && *end == '\0')
return result;
// not OK
print_help();
exit(2);
}
int main(int argc, char *argv[])
{
printf("Knot Resolver Cache Garbage Collector, version %s\n", PACKAGE_VERSION);
if (setvbuf(stdout, NULL, _IONBF, 0) || setvbuf(stderr, NULL, _IONBF, 0)) {
(void)fprintf(stderr, "Failed to to set output buffering (ignored): %s\n",
strerror(errno));
(void)fflush(stderr);
}
struct sigaction act = {
.sa_handler = got_killed,
.sa_flags = SA_RESETHAND,
};
sigemptyset(&act.sa_mask);
kr_assert(!sigaction(SIGTERM, &act, NULL));
kr_assert(!sigaction(SIGPIPE, &act, NULL));
kr_assert(!sigaction(SIGCHLD, &act, NULL));
kr_assert(!sigaction(SIGINT, &act, NULL));
kr_cache_gc_cfg_t cfg = {
.ro_txn_items = 200,
.rw_txn_items = 100,
.cache_max_usage = 80,
.cache_to_be_freed = 10
};
int o;
while ((o = getopt(argc, argv, "hnvc:d:l:L:m:u:f:w:t:")) != -1) {
switch (o) {
case 'c':
cfg.cache_path = optarg;
break;
case 'd':
cfg.gc_interval = get_nonneg_optarg();
cfg.gc_interval *= 1000;
break;
case 'l':
cfg.rw_txn_items = get_nonneg_optarg();
break;
case 'L':
cfg.ro_txn_items = get_nonneg_optarg();
break;
case 'm':
cfg.rw_txn_duration = get_nonneg_optarg();
break;
case 'u':
cfg.cache_max_usage = get_nonneg_optarg();
break;
case 'f':
cfg.cache_to_be_freed = get_nonneg_optarg();
break;
case 'w':
cfg.rw_txn_delay = get_nonneg_optarg();
break;
case 't':
cfg.temp_keys_space = get_nonneg_optarg();
cfg.temp_keys_space *= 1048576;
break;
case 'n':
cfg.dry_run = true;
break;
case 'v':
kr_log_level_set(LOG_DEBUG);
break;
case ':':
case '?':
case 'h':
print_help();
return 1;
default:
kr_assert(false);
}
}
if (cfg.cache_path == NULL) {
print_help();
return 1;
}
kr_cache_gc_state_t *gc_state = NULL;
bool last_espace = false;
do {
int ret = kr_cache_gc(&cfg, &gc_state);
/* Let's tolerate ESPACE unless twice in a row. */
if (ret == KNOT_ESPACE) {
if (!last_espace)
ret = KNOT_EOK;
last_espace = true;
} else {
last_espace = false;
}
// ENOENT: kresd may not be started yet or cleared the cache now
// MDB_MAP_RESIZED: GC bailed out but on next iteration it should be OK
if (ret && ret != KNOT_ENOENT && ret != kr_error(MDB_MAP_RESIZED)) {
printf("Error (%s)\n", knot_strerror(ret));
exit_code = 10;
break;
}
usleep(cfg.gc_interval);
} while (cfg.gc_interval > 0 && !killed);
kr_cache_gc_free_state(&gc_state);
return exit_code;
}
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