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#
# Copyright (c) 2013 Ryan Doyle.
#
# 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.
#
use strict;
use warnings;
use PCP::PMDA;
use LWP::UserAgent;
my @nginx_status = ();
my $nginx_status_url = "http://localhost/nginx_status";
my $nginx_fetch_timeout = 1;
my $http_client = LWP::UserAgent->new;
# Configuration files for overriding the above settings
for my $file (pmda_config('PCP_PMDAS_DIR') . '/nginx/nginx.conf', 'nginx.conf') {
eval `cat $file` unless ! -f $file;
}
$http_client->agent('pmdanginx');
$http_client->timeout($nginx_fetch_timeout);
sub update_nginx_status
{
my $response = $http_client->get($nginx_status_url);
if ($response->is_success) {
# All the content on the status page are digits. Map the array
# index to the metric item ID.
@nginx_status = ($response->decoded_content =~ m/(\d+)/gm);
} else {
@nginx_status = undef;
}
}
sub nginx_fetch_callback
{
my ($cluster, $item, $inst) = @_;
if ($cluster == 0 && defined($nginx_status[$item])){
return ($nginx_status[$item], 1);
}
return (PM_ERR_PMID, 0);
}
my $pmda = PCP::PMDA->new('nginx', 117);
$pmda->add_metric(pmda_pmid(0,0), PM_TYPE_U32, PM_INDOM_NULL,
PM_SEM_INSTANT, pmda_units(0,0,0,0,0,0),
'nginx.active',
'Number of active connections', '');
$pmda->add_metric(pmda_pmid(0,1), PM_TYPE_U64, PM_INDOM_NULL,
PM_SEM_COUNTER, pmda_units(0,0,1,0,0,PM_COUNT_ONE),
'nginx.accepts_count',
'Total number of accepted connections', '');
$pmda->add_metric(pmda_pmid(0,2), PM_TYPE_U64, PM_INDOM_NULL,
PM_SEM_COUNTER, pmda_units(0,0,1,0,0,PM_COUNT_ONE),
'nginx.handled_count',
'Total number of handled connections', '');
$pmda->add_metric(pmda_pmid(0,3), PM_TYPE_U64, PM_INDOM_NULL,
PM_SEM_COUNTER, pmda_units(0,0,1,0,0,PM_COUNT_ONE),
'nginx.requests_count',
'Total number of requests', '');
$pmda->add_metric(pmda_pmid(0,4), PM_TYPE_U32, PM_INDOM_NULL,
PM_SEM_INSTANT, pmda_units(0,0,0,0,0,0),
'nginx.reading',
'Reading the request header', '');
$pmda->add_metric(pmda_pmid(0,5), PM_TYPE_U32, PM_INDOM_NULL,
PM_SEM_INSTANT, pmda_units(0,0,0,0,0,0),
'nginx.writing',
'Reading the request body, processing the request or writing response', '');
$pmda->add_metric(pmda_pmid(0,6), PM_TYPE_U32, PM_INDOM_NULL,
PM_SEM_INSTANT, pmda_units(0,0,0,0,0,0),
'nginx.waiting',
'Keepalive connections', '');
$pmda->set_fetch_callback(\&nginx_fetch_callback);
$pmda->set_refresh(\&update_nginx_status);
$pmda->set_user('pcp');
$pmda->run;
=pod
=head1 NAME
pmdanginx - nginx performance metrics domain agent (PMDA)
=head1 DESCRIPTION
B<pmdanginx> is a Performance Metrics Domain Agent (PMDA) which exports
metric values from nginx.
=head1 INSTALLATION
This PMDA requires that the nginx stub_status module is active and
available at http://localhost/nginx_status
Install the nginx PMDA by using the B<Install> script as root:
# cd $PCP_PMDAS_DIR/nginx
# ./Install
To uninstall, do the following as root:
# cd $PCP_PMDAS_DIR/nginx
# ./Remove
B<pmdanginx> is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when
the agent is installed or removed.
=head1 FILES
=over
=item $PCP_PMDAS_DIR/nginx/nginx.conf
optional configuration file for B<pmdanginx>
=item $PCP_PMDAS_DIR/nginx/Install
installation script for the B<pmdanginx> agent
=item $PCP_PMDAS_DIR/nginx/Remove
undo installation script for the B<pmdanginx> agent
=item $PCP_LOG_DIR/pmcd/nginx.log
default log file for error messages from B<pmdanginx>
=back
=head1 SEE ALSO
pmcd(1).
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