#!/usr/bin/perl
#
# Plugin by Greg Connor
#
# 1. Drop or symlink "mhttping" into plugins dir
#
# 2. Edit mhttping to tell it where the "data" text file and "results"
# writable directory are.
#
# 3. Create the file "data" with a list of things to do...
#
# Format must include name=  url=  proxy=  in that order  (spaces or tabs ok)
# Use proxy=none for direct
#
# name=google_mtv1        url=http://www.google.com
# proxy=proxy1.mydomain.com:8080
# name=yahoo_mtv1 url=http://www.yahoo.com proxy=proxy1.mydomain.com:8080
# name=www_direct url=http://www.mydomain.com     proxy=none
#
# 4. Add to crontab to make "mhttping run" execute every 5 minutes, offset
# from munin time a bit.  This can be any user who can run "httping" and
# write to the "results" dir.
#
# 2-59/5 * * * *  /home/gconnor/mhttping/mhttping run >
# /home/gconnor/mhttping/log 2>&1
#
# 5. Verify that "mhttping run" works, from command line and from cron.  Then
# verify that "mtthping config" and "mhttping fetch" work.
#
# 6. Restart munin-node.
#

use strict ;


############################## STUFF YOU MIGHT NEED TO CHANGE

my $datafile = "$ENV{MUNIN_PLUGSTATE}/mhttping.data" ;
my $resultsdir = "/home/gconnor/mhttping/results/" ;
my $timeout = 30 ;
my $count = 3 ;
my $options = "-c $count -s -t $timeout" ;
my $debug = 0 ;



############################## CHANGE STUFF BELOW HERE AT YOUR OWN RISK

sub do_fetch() ;
sub do_config() ;
sub do_run() ;


if ( scalar(@ARGV) < 1 ) { do_fetch() ; }
elsif ( scalar(@ARGV) > 1 ) {
	print "$0: argument should be fetch, config, or run\n" ;
	exit 99;
}

elsif ($ARGV[0] eq "fetch") 	{ &do_fetch() ; }
elsif ($ARGV[0] eq "")	 	{ &do_fetch() ; }
elsif ($ARGV[0] eq "config") 	{ &do_config() ; }
elsif ($ARGV[0] eq "run")	{ &do_run() ; }
elsif ($ARGV[0] eq "rundebug")	{ $debug=1; &do_run() ; }
else {
	print "$0: argument should be fetch, config, or run, not $ARGV[0]\n" ;
	exit 99;
}

exit 0 ;



##############################
sub do_fetch() {

my ( @results, $file, $mtime, $avg ) ;

-d $resultsdir or `mkdir -p $resultsdir` ;
opendir (RESULTSDIR, $resultsdir)
	or die "Unable to open results dir $resultsdir: $!" ;
@results = readdir (RESULTSDIR)
	or die "Unable to read  results dir $resultsdir: $!" ;
close (RESULTSDIR) ;

for $file (@results) {
	next if ($file =~ /^\./) ;
	$mtime = (stat("$resultsdir/$file"))[9];
	if ( $mtime < (time()-300) ) {
		print ( STDERR "File too old, deleting: $file\n" ) ;
		unlink("$resultsdir/$file") ;
		next;
	}
	$avg = `cat $resultsdir/$file ` ;
	chomp $avg ;

	print "$file.value $avg\n" ;

} # end for $dir


} # end sub do_fetch()



##############################
sub do_config() {

my ( @results, $file, $mtime, $avg ) ;

-d $resultsdir or `mkdir -p $resultsdir` ;
opendir (RESULTSDIR, $resultsdir)
	or die "Unable to open results dir $resultsdir: $!" ;
@results = readdir (RESULTSDIR)
	or die "Unable to read  results dir $resultsdir: $!" ;
close (RESULTSDIR) ;

print "graph_title Web ping times\n" ;
print "graph_vlabel response time (sec)\n" ;
print "graph_category network\n" ;


for $file (@results) {
	next if ($file =~ /^\./) ;
	print "$file.label $file\n" ;
	print "$file.type GAUGE\n" ;
	print "$file.warning $timeout\n" ;

} # end for $file

} # end sub do_config()


##############################
sub do_run() {

my ( @results, $line, $site, %url, %proxy, $command, $result, %avgtime ) ;

# Create results directory if it doesn't already exist

-d $resultsdir or `mkdir -p $resultsdir` ;
-d $resultsdir or die "Unable to create results dir $resultsdir: $!" ;

# Read in the sites list (data file)

@results = ` cat $datafile `
	or die "Unable to read data file $datafile: $!" ;


# Parse data file and store results in $site, $url{$site}, $proxy{$site}

for $line ( @results ) {
	chomp $line ;
	next if ( $line =~ /^\s*#/ ) ;   #skip comments
	next if ( $line =~ /^\s*$/ ) ;   #skip empty lines
	if ( $line =~ /\s*name=(\S*)\s+url=(\S*)\s+proxy=(\S*)\s*/ ) {
		$site = $1 ;  $url{$site} = $2 ; $proxy{$site} = $3 ;
		if ( $proxy{$site} eq "none" || $proxy{$site} eq "" ) {
			$proxy{$site} = "" ;
		} else {
			$proxy{$site} = "-x $proxy{$site}" ;
		}
	} else {
		print ( STDERR "Can't parse this line, ignoring: $line\n" ) ;
	}
} # end for $line


# Visit each site and grab the average time

for $site ( keys(%url) ) {
	$command="httping $options $proxy{$site} -g $url{$site} 2>&1 " ;
	$debug && print "$command\n" ;

	$result= `$command` ;
	$debug && print "$result\n" ;

	if ( $result =~ m{round-trip min/avg/max = .*/(.*)/.* ms} ) {
		$avgtime{$site} = $1 / 1000 ;
		$debug && print "site=$site avgtime=$avgtime{$site}\n" ;
	} elsif ( $result =~ /timeout connecting to host/ ) {
		print ( STDERR "Timeout connecting to $site\n" ) ;
		print ( STDERR "command: $command\n" ) ;
		print ( STDERR "result:".substr($result,0,60)."\n" ) ;
		$avgtime{$site} = $timeout + 1 ;
		$debug && print "site=$site avgtime=$avgtime{$site}\n" ;
	} elsif ( $result =~ /error connecting to host/ ) {
		print ( STDERR "Error connecting to $site\n" ) ;
		print ( STDERR "command: $command\n" ) ;
		print ( STDERR "result:".substr($result,0,60)."\n" ) ;
		$avgtime{$site} = $timeout + 1 ;
		$debug && print "site=$site avgtime=$avgtime{$site}\n" ;
	} else {
		print ( STDERR "Could not parse result of command:\n" ) ;
		print ( STDERR "command: $command\n" ) ;
		print ( STDERR "result:".substr($result,0,60)."\n" ) ;
		$avgtime{$site} = "U" ;
	} # end if $result

	open ( RESULTSFILE, ">$resultsdir/$site" )
		or die "Unable to write results file $resultsdir/$site: $!" ;
	print ( RESULTSFILE "$avgtime{$site}\n" ) ;
	close ( RESULTSFILE ) ;

} # end for $site

} # end sub do_run()