#!/usr/bin/perl -w

use strict;
use warnings;
use LWP::Simple;
use Getopt::Long;
use JSON;

my $uri    = 'http://127.0.0.1/nginx-status';
my $what   = 'all';
my $help   = 0;
my $pretty = 0;

GetOptions(
  "uri=s"  => \$uri,
  "what=s" => \$what,
  "help"   => \$help,
  "pretty" => \$pretty
);

my $res = {};
my $status = get($uri);


unless ($status){
  print 'ZBX_NOTSUPPORTED';
  exit 1;
}

foreach my $line (split(/\n/, $status)){
  if ($line =~ m/^Active connections: (\d+)/){
    $res->{active_connections} = $1;
  } elsif ($line =~ m/\s*(\d+)\s+\d+\s+(\d+)/){
    $res->{total_connections} = $1;
    $res->{total_requests} = $2;
  } elsif ($line =~ m/Waiting: (\d+)/){
    $res->{keep_alive} = $1;
  }
}

if ($help){
  print "Valid keys are:\n\n";
  print "$_\n" for keys %{$res};
  exit 0;
}

if ($what eq 'all'){
  print to_json($res, { pretty => $pretty });
}
elsif (defined $res->{$what}){
  print $res->{$what};
}
else{
  print 'ZBX_NOTSUPPORTED';
}
exit 0;