rrd based system stats
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/***************************************************************************
* Copyright (C) 10/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <curl/curl.h>
#include "configfile.h"
#include "helper.h"
#include "list.h"
#include "plugins.h"
#include "probe.h"
#define BUFSIZE 8192
struct sammler_plugin plugin;
struct server_entry {
struct list_head list;
CURL *handle;
char *name;
};
static LIST_HEAD(server_list);
static const char *ds_def = {
"DS:total_accesses:COUNTER:90:0:U "
"DS:total_kbytes:COUNTER:90:0:U "
"DS:busy_workers:GAUGE:90:0:U "
"DS:idle_workers:GAUGE:90:0:U "
};
struct stats {
uint64_t total_accesses;
uint64_t total_kbytes;
uint64_t busy_workers;
uint64_t idle_workers;
};
static char *rx_buf;
static int rx_pos;
static const char * get_ds(int ds_id)
{
return ds_def;
}
static size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
// discard data
if (rx_pos + realsize >= BUFSIZE)
return realsize;
memcpy(rx_buf + rx_pos, buffer, realsize);
rx_pos += realsize;
return realsize;
}
static int probe(void)
{
struct server_entry *entry;
list_for_each_entry(entry, &server_list, list) {
rx_pos = 0;
curl_easy_perform(entry->handle);
struct stats stats;
memset(&stats, 0, sizeof(stats));
char *line, *tmp = rx_buf, *tmp2;
while ((line = strtok_r(tmp, "\r\n", &tmp2))) {
char *part[2];
strsplit(line, ":", part, 2);
if (!strcmp(part[0], "Total Accesses"))
stats.total_accesses = atoll(part[1]);
else if (!strcmp(part[0], "Total kBytes"))
stats.total_kbytes = atoll(part[1]);
else if (!strcmp(part[0], "BusyWorkers") || !strcmp(part[0], "BusyServers"))
stats.busy_workers = atoll(part[1]);
else if (!strcmp(part[0], "IdleWorkers") || !strcmp(part[0], "IdleServers"))
stats.idle_workers = atoll(part[1]);
tmp = NULL;
}
char filename[32];
int len = snprintf(filename, sizeof(filename), "apache-%s.rrd", entry->name);
if (len < 0 || len >= sizeof(filename))
continue;
probe_submit(&plugin, filename, 0, "%llu:%llu:%llu:%llu",
stats.total_accesses, stats.total_kbytes,
stats.busy_workers, stats.idle_workers);
}
return 0;
}
static int init_cb(const char *parameter, void *privdata)
{
char *part[4];
int ret = strsplit(parameter, ",", part, 4);
if (ret < 2) {
log_print(LOG_ERROR, "p_apache: parse error (1)");
return -1;
}
struct server_entry *entry = malloc(sizeof(struct server_entry));
if (entry == NULL) {
log_print(LOG_ERROR, "p_apache: out of memory");
return -1;
}
// reference config mem
entry->name = part[0];
entry->handle = curl_easy_init();
if (entry->handle == NULL) {
free(entry);
return -1;
}
ret = curl_easy_setopt(entry->handle, CURLOPT_URL, part[1]);
if (ret != 0) {
log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
curl_easy_cleanup(entry->handle);
free(entry);
return -1;
}
if (part[2] != NULL && part[3] != NULL) {
*(part[3] -1) = ':';
log_print(LOG_INFO, "p_apache: auth: '%s'", part[2]);
ret = curl_easy_setopt(entry->handle, CURLOPT_USERPWD, part[2]);
if (ret != 0) {
log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
curl_easy_cleanup(entry->handle);
free(entry);
return -1;
}
}
ret = curl_easy_setopt(entry->handle, CURLOPT_WRITEFUNCTION, &curl_callback);
if (ret != 0) {
log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
curl_easy_cleanup(entry->handle);
free(entry);
return -1;
}
ret = curl_easy_setopt(entry->handle, CURLOPT_WRITEDATA, entry);
if (ret != 0) {
log_print(LOG_ERROR, "p_apache: %s", curl_easy_strerror(ret));
curl_easy_cleanup(entry->handle);
free(entry);
return -1;
}
log_print(LOG_INFO, "p_apache: added server '%s'", entry->name);
list_add_tail(&entry->list, &server_list);
return 0;
}
static int init(void)
{
rx_buf = malloc(BUFSIZE);
if (rx_buf == NULL) {
log_print(LOG_ERROR, "p_apache: out of memory");
return -1;
}
config_get_strings("p_apache", "server", init_cb, NULL);
return 0;
}
static int fini(void)
{
struct server_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &server_list, list) {
curl_easy_cleanup(entry->handle);
free(entry);
}
free(rx_buf);
return 0;
}
struct sammler_plugin plugin = {
.name = "apache",
.interval = 60,
.init = &init,
.fini = &fini,
.probe = &probe,
.get_ds = &get_ds,
};