1 package Collectd::Graph::Type;
3 =head1 NAME
5 Collectd::Graph::Type - Base class for the collectd graphing infrastructure
7 =cut
9 # Copyright (C) 2008 Florian octo Forster <octo at verplant.org>
10 #
11 # This program is free software; you can redistribute it and/or modify it under
12 # the terms of the GNU General Public License as published by the Free Software
13 # Foundation; only version 2 of the License is applicable.
14 #
15 # This program is distributed in the hope that it will be useful, but WITHOUT
16 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 # details.
19 #
20 # You should have received a copy of the GNU General Public License along with
21 # this program; if not, write to the Free Software Foundation, Inc.,
22 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24 use strict;
25 use warnings;
27 use Carp (qw(confess cluck));
28 use RRDs ();
29 use URI::Escape (qw(uri_escape));
31 use Collectd::Graph::Common (qw($ColorCanvas $ColorFullBlue $ColorHalfBlue
32 ident_to_filename
33 ident_to_string
34 get_faded_color));
36 return (1);
38 =head1 DESCRIPTION
40 This module serves as base class for more specialized classes realizing
41 specific "types".
43 =head1 MEMBER VARIABLES
45 As typical in Perl, a Collectd::Graph::Type object is a blessed hash reference.
46 Member variables are entries in that hash. Inheriting classes are free to add
47 additional entries. To set the member variable B<foo> to B<42>, do:
49 $obj->{'foo'} = 42;
51 The following members control the behavior of Collectd::Graph::Type.
53 =over 4
55 =item B<files> (array reference)
57 List of RRD files. Each file is passed as "ident", i.E<nbsp>e. broken up into
58 "hostname", "plugin", "type" and optionally "plugin_instance" and
59 "type_instance". Use the B<addFiles> method rather than setting this directly.
61 =item B<data_sources> (array reference)
63 List of data sources in the RRD files. If this is not given, the default
64 implementation of B<getDataSources> will use B<RRDs::info> to find out which
65 data sources are contained in the files.
67 =item B<ds_names> (array reference)
69 Names of the data sources as printed in the graph. Should be in the same order
70 as the data sources are returned by B<getDataSources>.
72 =item B<rrd_title> (string)
74 Title of the RRD graph. The title can contain "{hostname}", "{plugin}" and so
75 on which are replaced with their actual value. See the B<getTitle> method
76 below.
78 =item B<rrd_opts> (array reference)
80 List of options directly passed to B<RRDs::graph>.
82 =item B<rrd_format> (string)
84 Format to use with B<GPRINT>. Defaults to C<%5.1lf>.
86 =item B<rrd_colors> (hash reference)
88 Mapping of data source names to colors, used when graphing the different data
89 sources. Colors are given in the typical hexadecimal RGB form, but without
90 leading "#", e.E<nbsp>g.:
92 $obj->{'rrd_colors'} = {foo => 'ff0000', bar => '00ff00'};
94 =back
96 =head1 METHODS
98 The following methods are used by the graphing front end and may be overwritten
99 to customize their behavior.
101 =over 4
103 =cut
105 sub _get_ds_from_file
106 {
107 my $file = shift;
108 my $info = RRDs::info ($file);
109 my %ds = ();
110 my @ds = ();
112 if (!$info || (ref ($info) ne 'HASH'))
113 {
114 return;
115 }
117 for (keys %$info)
118 {
119 if (m/^ds\[([^\]]+)\]/)
120 {
121 $ds{$1} = 1;
122 }
123 }
125 @ds = (keys %ds);
126 if (wantarray ())
127 {
128 return (@ds);
129 }
130 elsif (@ds)
131 {
132 return (\@ds);
133 }
134 else
135 {
136 return;
137 }
138 } # _get_ds_from_file
140 sub new
141 {
142 my $pkg = shift;
143 my $obj = bless ({files => []}, $pkg);
145 if (@_)
146 {
147 $obj->addFiles (@_);
148 }
150 return ($obj);
151 }
153 =item B<addFiles> ({ I<ident> }, [...])
155 Adds the given idents (which are hash references) to the B<files> member
156 variable, see above.
158 =cut
160 sub addFiles
161 {
162 my $obj = shift;
163 push (@{$obj->{'files'}}, @_);
164 }
166 =item B<getGraphsNum> ()
168 Returns the number of graphs that can be generated from the added files. By
169 default this number equals the number of files.
171 =cut
173 sub getGraphsNum
174 {
175 my $obj = shift;
176 return (scalar @{$obj->{'files'}});
177 }
179 =item B<getDataSources> ()
181 Returns the names of the data sources. If the B<data_sources> member variable
182 is unset B<RRDs::info> is used to read that information from the first file.
183 Set the B<data_sources> member variable instead of overloading this method!
185 =cut
187 sub getDataSources
188 {
189 my $obj = shift;
191 if (!defined $obj->{'data_sources'})
192 {
193 my $ident;
194 my $filename;
196 if (!@{$obj->{'files'}})
197 {
198 return;
199 }
201 $ident = $obj->{'files'}[0];
202 $filename = ident_to_filename ($ident);
204 $obj->{'data_sources'} = _get_ds_from_file ($filename);
205 if (!$obj->{'data_sources'})
206 {
207 cluck ("_get_ds_from_file ($filename) failed.");
208 }
209 }
211 if (!defined $obj->{'data_sources'})
212 {
213 return;
214 }
215 elsif (wantarray ())
216 {
217 return (@{$obj->{'data_sources'}})
218 }
219 else
220 {
221 $obj->{'data_sources'};
222 }
223 } # getDataSources
226 =item B<getTitle> (I<$index>)
228 Returns the title of the I<$index>th B<graph> (not necessarily file!). If the
229 B<rrd_title> member variable is unset, a generic title is generated from the
230 ident. Otherwise the substrings "{hostname}", "{plugin}", "{plugin_instance}",
231 "{type}", and "{type_instance}" are replaced by their respective values.
233 =cut
235 sub getTitle
236 {
237 my $obj = shift;
238 my $ident = shift;
239 my $title = $obj->{'rrd_title'};
241 if (!$title)
242 {
243 return (ident_to_string ($ident));
244 }
246 my $hostname = $ident->{'hostname'};
247 my $plugin = $ident->{'plugin'};
248 my $plugin_instance = $ident->{'plugin_instance'};
249 my $type = $ident->{'type'};
250 my $type_instance = $ident->{'type_instance'};
251 my $instance;
253 if (defined $type_instance)
254 {
255 $instance = $type_instance;
256 }
257 elsif (defined $plugin_instance)
258 {
259 $instance = $plugin_instance;
260 }
261 else
262 {
263 $instance = 'no instance';
264 }
266 if (!defined $plugin_instance)
267 {
268 $plugin_instance = 'no instance';
269 }
271 if (!defined $type_instance)
272 {
273 $type_instance = 'no instance';
274 }
276 $title =~ s#{hostname}#$hostname#g;
277 $title =~ s#{plugin}#$plugin#g;
278 $title =~ s#{plugin_instance}#$plugin_instance#g;
279 $title =~ s#{type}#$type#g;
280 $title =~ s#{type_instance}#$type_instance#g;
281 $title =~ s#{instance}#$instance#g;
283 return ($title);
284 }
286 =item B<getRRDArgs> (I<$index>)
288 Return the arguments needed to generate the graph from the RRD file(s). If the
289 file has only one data source, this default implementation will generate that
290 typical min, average, max graph you probably know from temperatures and such.
291 If the RRD files have multiple data sources, the average of each data source is
292 printes as simple line.
294 =cut
296 sub getRRDArgs
297 {
298 my $obj = shift;
299 my $index = shift;
301 my $ident = $obj->{'files'}[$index];
302 if (!$ident)
303 {
304 cluck ("Invalid index: $index");
305 return;
306 }
307 my $filename = ident_to_filename ($ident);
309 my $rrd_opts = $obj->{'rrd_opts'} || [];
310 my $rrd_title = $obj->getTitle ($ident);
311 my $format = $obj->{'rrd_format'} || '%5.1lf';
313 my $rrd_colors = $obj->{'rrd_colors'};
314 my @ret = ('-t', $rrd_title, @$rrd_opts);
316 if (defined $obj->{'rrd_vertical'})
317 {
318 push (@ret, '-v', $obj->{'rrd_vertical'});
319 }
321 my $ds_names = $obj->{'ds_names'};
322 if (!$ds_names)
323 {
324 $ds_names = {};
325 }
327 my $ds = $obj->getDataSources ();
328 if (!$ds)
329 {
330 confess ("obj->getDataSources failed.");
331 }
333 if (!$rrd_colors)
334 {
335 my @tmp = ('0000ff', 'ff0000', '00ff00', 'ff00ff', '00ffff', 'ffff00');
337 for (my $i = 0; $i < @$ds; $i++)
338 {
339 $rrd_colors->{$ds->[$i]} = $tmp[$i % @tmp];
340 }
341 }
343 for (my $i = 0; $i < @$ds; $i++)
344 {
345 my $f = $filename;
346 my $ds_name = $ds->[$i];
348 # We need to escape colons for RRDTool..
349 $f =~ s#:#\\:#g;
350 $ds_name =~ s#:#\\:#g;
352 if (exists ($obj->{'scale'}))
353 {
354 my $scale = 0.0 + $obj->{'scale'};
355 push (@ret,
356 "DEF:min${i}_raw=${f}:${ds_name}:MIN",
357 "DEF:avg${i}_raw=${f}:${ds_name}:AVERAGE",
358 "DEF:max${i}_raw=${f}:${ds_name}:MAX",
359 "CDEF:max${i}=max${i}_raw,$scale,*",
360 "CDEF:avg${i}=avg${i}_raw,$scale,*",
361 "CDEF:min${i}=min${i}_raw,$scale,*");
362 }
363 else
364 {
365 push (@ret,
366 "DEF:min${i}=${f}:${ds_name}:MIN",
367 "DEF:avg${i}=${f}:${ds_name}:AVERAGE",
368 "DEF:max${i}=${f}:${ds_name}:MAX");
369 }
370 }
372 if (@$ds == 1)
373 {
374 my $ds_name = $ds->[0];
375 my $color_fg = $rrd_colors->{$ds_name} || '000000';
376 my $color_bg = get_faded_color ($color_fg);
378 if ($ds_names->{$ds_name})
379 {
380 $ds_name = $ds_names->{$ds_name};
381 }
382 $ds_name =~ s#:#\\:#g;
384 push (@ret,
385 "AREA:max0#${color_bg}",
386 "AREA:min0#${ColorCanvas}",
387 "LINE1:avg0#${color_fg}:${ds_name}",
388 "GPRINT:min0:MIN:${format} Min,",
389 "GPRINT:avg0:AVERAGE:${format} Avg,",
390 "GPRINT:max0:MAX:${format} Max,",
391 "GPRINT:avg0:LAST:${format} Last\\l");
392 }
393 else
394 {
395 for (my $i = 0; $i < @$ds; $i++)
396 {
397 my $ds_name = $ds->[$i];
398 my $color = $rrd_colors->{$ds_name} || '000000';
400 if ($ds_names->{$ds_name})
401 {
402 $ds_name = $ds_names->{$ds_name};
403 }
405 push (@ret,
406 "LINE1:avg${i}#${color}:${ds_name}",
407 "GPRINT:min${i}:MIN:${format} Min,",
408 "GPRINT:avg${i}:AVERAGE:${format} Avg,",
409 "GPRINT:max${i}:MAX:${format} Max,",
410 "GPRINT:avg${i}:LAST:${format} Last\\l");
411 }
412 }
414 return (\@ret);
415 } # getRRDArgs
417 =item B<getGraphArgs> (I<$index>)
419 Returns the parameters that should be passed to the CGI script to generate the
420 I<$index>th graph. The returned string is already URI-encoded and will possibly
421 set the "hostname", "plugin", "plugin_instance", "type", and "type_instance"
422 parameters.
424 The default implementation simply uses the ident of the I<$index>th file to
425 fill this.
427 =cut
429 sub getGraphArgs
430 {
431 my $obj = shift;
432 my $index = shift;
433 my $ident = $obj->{'files'}[$index];
435 my @args = ();
436 for (qw(hostname plugin plugin_instance type type_instance))
437 {
438 if (defined ($ident->{$_}))
439 {
440 push (@args, uri_escape ($_) . '=' . uri_escape ($ident->{$_}));
441 }
442 }
444 return (join (';', @args));
445 }
447 =item B<getLastModified> ([I<$index>])
449 If I<$index> is not given, the modification time of all files is scanned and the most recent modification is returned. If I<$index> is given, only the files belonging to the I<$index>th graph will be considered.
451 =cut
453 sub getLastModified
454 {
455 my $obj = shift;
456 my $index = @_ ? shift : -1;
458 my $mtime = 0;
460 if ($index == -1)
461 {
462 for (@{$obj->{'files'}})
463 {
464 my $ident = $_;
465 my $filename = ident_to_filename ($ident);
466 my @statbuf = stat ($filename);
468 if (!@statbuf)
469 {
470 next;
471 }
473 if ($mtime < $statbuf[9])
474 {
475 $mtime = $statbuf[9];
476 }
477 }
478 }
479 else
480 {
481 my $ident = $obj->{'files'}[$index];
482 my $filename = ident_to_filename ($ident);
483 my @statbuf = stat ($filename);
485 $mtime = $statbuf[9];
486 }
488 if (!$mtime)
489 {
490 return;
491 }
492 return ($mtime);
493 } # getLastModified
495 =back
497 =head1 SEE ALSO
499 L<Collectd::Graph::Type::GenericStacked>
501 =head1 AUTHOR AND LICENSE
503 Copyright (c) 2008 by Florian Forster
504 E<lt>octoE<nbsp>atE<nbsp>verplant.orgE<gt>. Licensed under the terms of the GNU
505 General Public License, VersionE<nbsp>2 (GPLv2).
507 =cut
509 # vim: set shiftwidth=2 softtabstop=2 tabstop=8 :