# -*-perl-*-

# Cricket: a configuration, polling and data display wrapper for RRD files
#
#    Copyright (C) 1998 Jeff R. Allen and WebTV Networks, Inc.
#
#    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.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

use Common::Log;

$main::gDSFetch{'file'} = \&fileFetch;

sub fileFetch {
	# This procedure is passed a REFERENCE to an array of file datasources.
	# The line consists of "index:line-num:shell command"
	#
	# There can and will be spaces in the shell command. If line-num
	# is missing it is assumed to be the first output line.
	#
	# VERY IMPORTANT: The index MUST be returned with the corresponding value,
	# otherwise it'll get put back into the wrong spot in the RRD.

	my($dsList, $name, $target) = @_;

	my(@results, %files);

	my($line);
	foreach $line (@{$dsList}) {
		my(@components) = split(/:/, $line, 3);
		my($index, $lineno, $file);

		if ($#components+1 == 3) {
			($index, $lineno, $file) = @components;
		} elsif ($#components == 1) {
			($index, $file) = @components;
			$lineno = 0;
		} else {
			Error("Malformed datasource source: $line.");
			return ();
		}
		push(@{ $files{$file} }, "$index:$lineno");
	}

	my($file, $ilRef, $il);

	while (($file, $ilRef) = each %files) {
		Info("Reading data from $file for " .
							 $target->{'auto-target-name'});

		if (open(F, "<$file")) {
			my(@lines);
			chomp(@lines = <F>);
			close(F);

			while ($il = shift @{ $ilRef } ) {
				my($index, $lineno) = split(/:/, $il, 2);
				if (defined($lines[$lineno])) {
					push @results, "$index:$lines[$lineno]";
				} else {
					push @results, "$index:U";
				}
			}
		} else {
			Error("Could not fetch data for " .
					$target->{'auto-target-name'} .
					" from file $file: $!.");
		}
	}

	return @results;
}

1;