#!/usr/bin/perl -w
 
use strict;
use LWP::UserAgent;
use DBI;
use Net::Ping;
use MIME::Lite;
 
 
my $is_prsd_ok = &check_prsd('sample');
 
my $is_httpd_ok = &check_httpd();
my $is_db_ok = &check_database();
my $is_chat_ok = &check_chat();
my $is_prsd_ok = &check_prsd();
 
# if any one is not ok then send an email
if ( (!$is_httpd_ok) || (!$is_db_ok) || (!$is_chat_ok) || (!$is_prsd_ok) ) {
 
    # use MIME::Lite to send an email.
    
        
    my $msg = MIME::Lite->new(
                 From     =>'server@example.com',
                 To       =>'admin@example.com',
                 Subject  =>"Server error report",
                 Type    => 'text',
                 Data     =>"Server error report for scalar(localtime()), - " . time(),  #timestamp??
                 );
    # also add record to monitor.log that email was sent
    $msg->send();
    
    open (FILE, ">>monitor.log");
    print FILE "This is a test\n";
    close (FILE);
  
}
 
exit();
 
# if httpd is up, then status return should be TRUE
sub check_httpd {
 
    # use LWP to check www.catholicmatch.com
    my $ua = LWP::UserAgent->new();
    my $request = HTTP::Request->new('GET', 'http://www.example.com');
    my $response = $ua->request($request);
    
 
    if ($response->is_success()) {
        # This should eventually be logged -  open FILE (">>monitor.log") || die "some error";
        print "Website is up and running\n";
        return 1;
    }
    
    # This should eventually be logged -  open FILE (">>monitor.log") || die "some error";
    print "Website is down\n";
    return 0;
 
}
 
 
#sub ping {
 #       my($dbh) = @_;
  #      my $ret = 0;
   #     eval {
    #        local $SIG{__DIE__}  = sub { return (0); };
      #      local $SIG{__WARN__} = sub { return (0); };
            # adapt the select statement to your database:
     #       $ret = $dbh->do('select 1');
      #  };
       # return ($@) ? 0 : $ret;
    # }
 
 
 
 
sub check_database {
 
    # use dbi to check sample2 (DBI->ping())
    my ($database,$user,$password) = @_;
    my $dbh = DBI->connect("DBI:mysql:sample2"
            , undef
            , undef
            , {PrintError => 1, RaiseError => 0}
       ) or db_err("Unable to connect to $database", $DBI::errstr);
 
    # return status of running database
    eval {
        alarm(5); # seconds before time out
        $dbh = DBI->ping("dbi:mysql:anne" ,"", "");
        alarm(0); # cancel alarm (if connect worked fast)
    };
    alarm(0);    # cancel alarm (if eval failed)
 
}
    
sub db_err {
    
   my($msg, $errstr) = @_;
   open (FILE, ">>monitor.log");
   print FILE "This is a test\n";
   print FILE->$msg;
    print FILE->($errstr);
   
    close (FILE);
}
 
# if chat is up, then status return should be TRUE
sub check_chat {
 
    # use net ping to check sample on port 5678
    # my $dbh = ping();
 
    my $pinghost = 'sample.example.com';
    my $p = Net::Ping->new("tcp", 2);
    for (;;) {
        
            unless ($p->ping($pinghost)) {
            print "Fail: ", scalar(localtime), "\n";
            return 1;
            }
             
            print "Success: ", scalar(localtime), "\n";
            return 0;
    }
 
}
 
# a better way would be to send this, but ping is okay <message command="login" cookie="ASDFASDF" />
 
sub check_prsd {
 
    # use net ping to check sample on port 5959
    my ($host) = @_;
    
    my $p = Net::Ping->new("tcp", 2); 
    $p->{'port_num'} = 5959;     
              
    if ($p->ping($host, 2)) {
        print "$host is alive.\n";
        return 1;
    }
    
    print "$host is not reachable.\n";
    return 0;
 
    
}