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/* $OpenBSD: stat_ramstat.c,v 1.11 2018/05/31 21:06:12 gilles Exp $ */
/*
* Copyright (c) 2012 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <event.h>
#include <imsg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "smtpd.h"
#include "log.h"
static void ramstat_init(void);
static void ramstat_close(void);
static void ramstat_increment(const char *, size_t);
static void ramstat_decrement(const char *, size_t);
static void ramstat_set(const char *, const struct stat_value *);
static int ramstat_iter(void **, char **, struct stat_value *);
struct ramstat_entry {
RB_ENTRY(ramstat_entry) entry;
char key[STAT_KEY_SIZE];
struct stat_value value;
};
RB_HEAD(stats_tree, ramstat_entry) stats;
RB_PROTOTYPE(stats_tree, ramstat_entry, entry, ramstat_entry_cmp);
struct stat_backend stat_backend_ramstat = {
ramstat_init,
ramstat_close,
ramstat_increment,
ramstat_decrement,
ramstat_set,
ramstat_iter
};
static void
ramstat_init(void)
{
log_trace(TRACE_STAT, "ramstat: init");
RB_INIT(&stats);
/* ramstat_set() should be called for each key we want
* to have displayed by smtpctl show stats at startup.
*/
ramstat_set("uptime", stat_timestamp(env->sc_uptime));
}
static void
ramstat_close(void)
{
log_trace(TRACE_STAT, "ramstat: close");
}
static void
ramstat_increment(const char *name, size_t val)
{
struct ramstat_entry *np, lk;
log_trace(TRACE_STAT, "ramstat: increment: %s", name);
(void)strlcpy(lk.key, name, sizeof (lk.key));
np = RB_FIND(stats_tree, &stats, &lk);
if (np == NULL) {
np = xcalloc(1, sizeof *np);
(void)strlcpy(np->key, name, sizeof (np->key));
RB_INSERT(stats_tree, &stats, np);
}
log_trace(TRACE_STAT, "ramstat: %s (%p): %zd -> %zd",
name, name, np->value.u.counter, np->value.u.counter + val);
np->value.u.counter += val;
}
static void
ramstat_decrement(const char *name, size_t val)
{
struct ramstat_entry *np, lk;
log_trace(TRACE_STAT, "ramstat: decrement: %s", name);
(void)strlcpy(lk.key, name, sizeof (lk.key));
np = RB_FIND(stats_tree, &stats, &lk);
if (np == NULL) {
np = xcalloc(1, sizeof *np);
(void)strlcpy(np->key, name, sizeof (np->key));
RB_INSERT(stats_tree, &stats, np);
}
log_trace(TRACE_STAT, "ramstat: %s (%p): %zd -> %zd",
name, name, np->value.u.counter, np->value.u.counter - val);
np->value.u.counter -= val;
}
static void
ramstat_set(const char *name, const struct stat_value *val)
{
struct ramstat_entry *np, lk;
log_trace(TRACE_STAT, "ramstat: set: %s", name);
(void)strlcpy(lk.key, name, sizeof (lk.key));
np = RB_FIND(stats_tree, &stats, &lk);
if (np == NULL) {
np = xcalloc(1, sizeof *np);
(void)strlcpy(np->key, name, sizeof (np->key));
RB_INSERT(stats_tree, &stats, np);
}
log_trace(TRACE_STAT, "ramstat: %s: n/a -> n/a", name);
np->value = *val;
}
static int
ramstat_iter(void **iter, char **name, struct stat_value *val)
{
struct ramstat_entry *np;
log_trace(TRACE_STAT, "ramstat: iter");
if (RB_EMPTY(&stats))
return 0;
if (*iter == NULL)
np = RB_MIN(stats_tree, &stats);
else
np = RB_NEXT(stats_tree, &stats, *iter);
*iter = np;
if (np == NULL)
return 0;
*name = np->key;
*val = np->value;
return 1;
}
static int
ramstat_entry_cmp(struct ramstat_entry *e1, struct ramstat_entry *e2)
{
return strcmp(e1->key, e2->key);
}
RB_GENERATE(stats_tree, ramstat_entry, entry, ramstat_entry_cmp);
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