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#!/usr/bin/perl -w

use strict;
use RRDs;
use BER;
use English;
use Time::ParseDate;

my $ECHOLOT_BASE = shift @ARGV;
my $RRDPATH = shift @ARGV;
die ("Usage: $PROGRAM_NAME <echolot base> <rrd dir>\n") if (!defined $ECHOLOT_BASE || !defined $RRDPATH || scalar @ARGV > 0);


my @MONTH = qw{Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec};
my $BASEDIR = $ECHOLOT_BASE.'/results/thesaurus/';  # we depend on that trailing /
my $INDEX = $BASEDIR.'index.txt';
my $NOW = time;
my $VERBOSE = 0;

chdir $RRDPATH or die ("Cannot chdir $RRDPATH: $!\n");

sub check_exists($) {
	my ($name) = @_;
	my $rrd = "$name.rrd";
	return if (-e $rrd);
	my @params = ($rrd);
	push @params, '-b', 'now - 5 months',
	  qw{ --step 86400
	      DS:total:GAUGE:172800:U:U
	      DS:typeI:GAUGE:172800:U:U
	      DS:typeII:GAUGE:172800:U:U
	      RRA:AVERAGE:0.5:1:3650
	};
	RRDs::create @params;
	my $err=RRDs::error;
	warn "ERROR while creating $rrd: $err\n" if $err;
}

sub check_exists_PoolSize($) {
	my ($name) = @_;
	my $rrd = "$name.pool.rrd";
	return if (-e $rrd);
	my @params = ($rrd);
	push @params, '-b', 'now - 5 months',
	  qw{ --step 86400
	      DS:poolSize:GAUGE:172800:0:U
	      RRA:AVERAGE:0.5:1:3650
	      RRA:MIN:0.5:1:3650
	      RRA:MAX:0.5:1:3650
	};
	RRDs::create @params;
	my $err=RRDs::error;
	warn "ERROR while creating $rrd: $err\n" if $err;
}

my %REMAILERS;
open(INDEX, $INDEX) or die ("Cannot open $INDEX: $!\n");
while (<INDEX>) {
	my($nick, $id) = $_ =~ /^([a-z0-9]+)  \s+ ([0-9]+) \s/x;
	next unless defined $nick;
	$REMAILERS{$id} = $nick;
};
close(INDEX);

my %RELIABLE;
my %MIXMASTER;
for my $id (keys %REMAILERS) {
	my $nick = $REMAILERS{$id};
	unless (open(F, $BASEDIR.$id.'.stats')) {
		warn("Cannot open $id.stats: $!\n") if ($VERBOSE >= 1);
		next;
	};
	local $/;
	undef $/;
	my $stats = <F>;
	close F;

	if ($stats =~ /^Number of messages per day:/m) {
		$MIXMASTER{$id} = $stats;
	} elsif ($stats =~ /^\s*Messages Received Last Week:\s+([0-9]+)/m) {
		my $total = $1;
		my ($generated) = $stats =~ /^\s*Generated: (.*)/m;
		if (defined $generated) {
			my $gen = parsedate($generated);
			unless (defined $generated) {
				print "Cannot parse generated '$generated' for $id\n";
			};
			$generated = $gen;
			#print scalar gmtime $generated,"\n";
		};
		unless (defined $generated) { # no else as if block may set generated to undef.
			print "Don't have a generated date for $id.\n";
			my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
			    $atime,$mtime,$ctime,$blksize,$blocks)
			   = stat($BASEDIR.$id.'.stats');
			unless (defined $mtime) {
				print "Don't even have an mtime for the file\n";
				next;
			};
			$generated = $mtime;
		}
		$RELIABLE{$id} = { total => $total, generated => $generated};
	} elsif ($stats =~ /^Remailer-Type: Reliable v/m) {
		# Reliable without stats enabled
	} else {
		print "Don't know what $id is.\n";
	}
}


# do reliable
# find out last week:
my $last_week = $NOW - ($NOW % (3600*24*7)) - 3600*24*7;
for my $id (keys %RELIABLE) {
	my $remailer = $RELIABLE{$id};
	check_exists($REMAILERS{$id});
	my $last = RRDs::last($REMAILERS{$id}.'.rrd');
	my $err=RRDs::error;
	warn "ERROR while updating:  $err\n" if $err;
	my $time = $remailer->{'generated'} - ($remailer->{'generated'} % (3600*24));
	next if ($time <= $last);
	RRDs::update( $REMAILERS{$id}.'.rrd' , $time.':'.int($remailer->{'total'}/7).':U:U' );
	$err=RRDs::error;
	warn "ERROR while updating:  $err\n" if $err;
}

	# Number of messages per day:
	# 16 Aug: 14691  Intermediate:9568  Mail:4637  Postings:  24
	# 17 Aug:  717  Intermediate: 579  Mail: 104  Postings:   0

for my $id (keys %MIXMASTER) {
	my @updates;
	my @updatesPoolSize;
	check_exists($REMAILERS{$id});

	my $last = 0;
	if ( -e $REMAILERS{$id}.'.rrd') {
		$last = RRDs::last($REMAILERS{$id}.'.rrd');
		my $err=RRDs::error;
		warn "ERROR while updating:  $err\n" if $err;
	};
	my $lastPoolSize = 0;
	if (-e $REMAILERS{$id}.'.pool.rrd') {
		$lastPoolSize = RRDs::last($REMAILERS{$id}.'.pool.rrd');
		my $err=RRDs::error;
		warn "ERROR while updating:  $err\n" if $err;
	};

	# start 4 months ago:
	for (my $time = $NOW - ($NOW % (3600*24)) - 3600*24*4*30; $time < $NOW; $time += 3600*24) {
		my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime($time);
		my $match = sprintf("%02d %s:", $mday, $MONTH[$mon]);

		my ($type1, $type2, $total, $pool);
		if ($MIXMASTER{$id} =~ /^$match\s*([0-9]+)(?:.*Pool\s*size:\s*([0-9]+))?/m) {
			$type2 = $total = $1;
			$type1 = 'U';
			$pool = defined $2 ? $2 : undef;
		} elsif ($MIXMASTER{$id} =~ /^$match\s+Mix:\s*([0-9]+)\s* PGP:\s*([0-9]+)(?:.*Pool\s*size:\s*([0-9]+))?/m) {
			$type1 = $2;
			$type2 = $1;
			$total = $1 + $2;
			$pool = defined $3 ? $3 : undef;
		} else {
			next;
		};

		if ($time > $last) {
			push @updates, $time.':'.$total.':'.$type1.':'.$type2;
		};
		if (defined $pool && $time > $lastPoolSize) {
			push @updatesPoolSize, $time.':'.$pool;
		};
	}
	if (scalar @updates != 0) {
		check_exists($REMAILERS{$id});
		RRDs::update( $REMAILERS{$id}.'.rrd', @updates );
		my $err=RRDs::error;
		warn "ERROR while updating:  $err\n" if $err;
	};
	if (scalar @updatesPoolSize != 0) {
		check_exists_PoolSize($REMAILERS{$id});
		RRDs::update( $REMAILERS{$id}.'.pool.rrd', @updatesPoolSize );
		my $err=RRDs::error;
		warn "ERROR while updating:  $err\n" if $err;
	};
}