/* $Id: stats.c,v 1.6 2001-09-15 21:27:58 rjkaes Exp $
*
* This module handles the statistics for tinyproxy. There are only two
* public API functions. The reason for the functions, rather than just a
* external structure is that tinyproxy is now multi-threaded and we can
* not allow more than one thread to access the statistics at the same
* time. This is prevented by a mutex. If there is a need for more
* statistics in the future, just add to the structure, enum (in the header),
* and the switch statement in update_stats().
*
* Copyright (C) 2000 Robert James Kaes (rjkaes@flarenet.com)
*
* 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, 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.
*/
#include "tinyproxy.h"
#include "log.h"
#include "stats.h"
#include "utils.h"
struct stat_s {
unsigned long int num_reqs;
unsigned long int num_badcons;
unsigned long int num_open;
unsigned long int num_refused;
unsigned long int num_denied;
};
static struct stat_s stats;
/*
* Locking when we're accessing the statistics, since I don't want multiple
* threads changing the information at the same time.
*/
pthread_mutex_t stats_mutex = PTHREAD_MUTEX_INITIALIZER;
#define LOCK() pthread_mutex_lock(&stats_mutex)
#define UNLOCK() pthread_mutex_unlock(&stats_mutex)
/*
* Initialise the statistics information to zero.
*/
void init_stats(void)
{
LOCK();
memset(&stats, 0, sizeof(stats));
UNLOCK();
}
/*
* Display the statics of the tinyproxy server.
*/
int showstats(struct conn_s *connptr)
{
static char *msg = \
"%s (%s) stats\r\n" \
"\r\n" \
"%s (%s) run-time statistics
\r\n" \
"\r\n" \
"Number of open connections: %lu
\r\n" \
"Number of requests: %lu
\r\n" \
"Number of bad connections: %lu
\r\n" \
"Number of denied connections: %lu
\r\n" \
"Number of refused connections due to high load: %lu\r\n" \
"
\r\n\r\n";
char *message_buffer;
message_buffer = safemalloc(MAXBUFFSIZE);
if (!message_buffer)
return -1;
LOCK();
snprintf(message_buffer, MAXBUFFSIZE, msg,
PACKAGE, VERSION, PACKAGE, VERSION,
stats.num_open,
stats.num_reqs,
stats.num_badcons,
stats.num_denied,
stats.num_refused);
UNLOCK();
if (send_http_message(connptr, 200, "OK", message_buffer) < 0) {
safefree(message_buffer);
return -1;
}
safefree(message_buffer);
return 0;
}
/*
* Update the value of the statistics. The update_level is defined in
* stats.h
*/
int update_stats(status_t update_level)
{
LOCK();
switch(update_level) {
case STAT_BADCONN:
stats.num_badcons++;
break;
case STAT_OPEN:
stats.num_open++;
stats.num_reqs++;
break;
case STAT_CLOSE:
stats.num_open--;
break;
case STAT_REFUSE:
stats.num_refused++;
break;
case STAT_DENIED:
stats.num_denied++;
break;
default:
UNLOCK();
return -1;
}
UNLOCK();
return 0;
}