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/* utility routines for keeping conters about events and the event rates */
/* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/*! \addtogroup rate_ctr
* @{
*/
/*! \file rate_ctr.c */
#include <stdint.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/rate_ctr.h>
static LLIST_HEAD(rate_ctr_groups);
static void *tall_rate_ctr_ctx;
/*! \brief Allocate a new group of counters according to description
* \param[in] ctx \ref talloc context
* \param[in] desc Rate counter group description
* \param[in] idx Index of new counter group
*/
struct rate_ctr_group *rate_ctr_group_alloc(void *ctx,
const struct rate_ctr_group_desc *desc,
unsigned int idx)
{
unsigned int size;
struct rate_ctr_group *group;
size = sizeof(struct rate_ctr_group) +
desc->num_ctr * sizeof(struct rate_ctr);
if (!ctx)
ctx = tall_rate_ctr_ctx;
group = talloc_zero_size(ctx, size);
if (!group)
return NULL;
group->desc = desc;
group->idx = idx;
llist_add(&group->list, &rate_ctr_groups);
return group;
}
/*! \brief Free the memory for the specified group of counters */
void rate_ctr_group_free(struct rate_ctr_group *grp)
{
llist_del(&grp->list);
talloc_free(grp);
}
/*! \brief Add a number to the counter */
void rate_ctr_add(struct rate_ctr *ctr, int inc)
{
ctr->current += inc;
}
/*! \brief Return the counter difference since the last call to this function */
int64_t rate_ctr_difference(struct rate_ctr *ctr)
{
int64_t result = ctr->current - ctr->previous;
ctr->previous = ctr->current;
return result;
}
/* TODO: support update intervals > 1s */
/* TODO: implement this as a special stats reporter */
static void interval_expired(struct rate_ctr *ctr, enum rate_ctr_intv intv)
{
/* calculate rate over last interval */
ctr->intv[intv].rate = ctr->current - ctr->intv[intv].last;
/* save current counter for next interval */
ctr->intv[intv].last = ctr->current;
/* update the rate of the next bigger interval. This will
* be overwritten when that next larger interval expires */
if (intv + 1 < ARRAY_SIZE(ctr->intv))
ctr->intv[intv+1].rate += ctr->intv[intv].rate;
}
static struct osmo_timer_list rate_ctr_timer;
static uint64_t timer_ticks;
/* The one-second interval has expired */
static void rate_ctr_group_intv(struct rate_ctr_group *grp)
{
unsigned int i;
for (i = 0; i < grp->desc->num_ctr; i++) {
struct rate_ctr *ctr = &grp->ctr[i];
interval_expired(ctr, RATE_CTR_INTV_SEC);
if ((timer_ticks % 60) == 0)
interval_expired(ctr, RATE_CTR_INTV_MIN);
if ((timer_ticks % (60*60)) == 0)
interval_expired(ctr, RATE_CTR_INTV_HOUR);
if ((timer_ticks % (24*60*60)) == 0)
interval_expired(ctr, RATE_CTR_INTV_DAY);
}
}
static void rate_ctr_timer_cb(void *data)
{
struct rate_ctr_group *ctrg;
/* Increment number of ticks before we calculate intervals,
* as a counter value of 0 would already wrap all counters */
timer_ticks++;
llist_for_each_entry(ctrg, &rate_ctr_groups, list)
rate_ctr_group_intv(ctrg);
osmo_timer_schedule(&rate_ctr_timer, 1, 0);
}
/*! \brief Initialize the counter module */
int rate_ctr_init(void *tall_ctx)
{
tall_rate_ctr_ctx = tall_ctx;
rate_ctr_timer.cb = rate_ctr_timer_cb;
osmo_timer_schedule(&rate_ctr_timer, 1, 0);
return 0;
}
/*! \brief Search for counter group based on group name and index */
struct rate_ctr_group *rate_ctr_get_group_by_name_idx(const char *name, const unsigned int idx)
{
struct rate_ctr_group *ctrg;
llist_for_each_entry(ctrg, &rate_ctr_groups, list) {
if (!ctrg->desc)
continue;
if (!strcmp(ctrg->desc->group_name_prefix, name) &&
ctrg->idx == idx) {
return ctrg;
}
}
return NULL;
}
/*! \brief Search for counter group based on group name */
const struct rate_ctr *rate_ctr_get_by_name(const struct rate_ctr_group *ctrg, const char *name)
{
int i;
const struct rate_ctr_desc *ctr_desc;
if (!ctrg->desc)
return NULL;
for (i = 0; i < ctrg->desc->num_ctr; i++) {
ctr_desc = &ctrg->desc->ctr_desc[i];
if (!strcmp(ctr_desc->name, name)) {
return &ctrg->ctr[i];
}
}
return NULL;
}
int rate_ctr_for_each_counter(struct rate_ctr_group *ctrg,
rate_ctr_handler_t handle_counter, void *data)
{
int rc = 0;
int i;
for (i = 0; i < ctrg->desc->num_ctr; i++) {
struct rate_ctr *ctr = &ctrg->ctr[i];
rc = handle_counter(ctrg,
ctr, &ctrg->desc->ctr_desc[i], data);
if (rc < 0)
return rc;
}
return rc;
}
int rate_ctr_for_each_group(rate_ctr_group_handler_t handle_group, void *data)
{
struct rate_ctr_group *statg;
int rc = 0;
llist_for_each_entry(statg, &rate_ctr_groups, list) {
rc = handle_group(statg, data);
if (rc < 0)
return rc;
}
return rc;
}
/*! @} */
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