1 #
2 # collectd - bindings/buildperl/Collectd/Unixsock.pm
3 # Copyright (C) 2007,2008 Florian octo Forster
4 #
5 # Permission is hereby granted, free of charge, to any person obtaining a
6 # copy of this software and associated documentation files (the "Software"),
7 # to deal in the Software without restriction, including without limitation
8 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 # and/or sell copies of the Software, and to permit persons to whom the
10 # Software is furnished to do so, subject to the following conditions:
11 #
12 # The above copyright notice and this permission notice shall be included in
13 # all copies or substantial portions of the Software.
14 #
15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 # DEALINGS IN THE SOFTWARE.
22 #
23 # Authors:
24 # Florian Forster <octo at collectd.org>
25 #
27 package Collectd::Unixsock;
29 =head1 NAME
31 Collectd::Unixsock - Abstraction layer for accessing the functionality by
32 collectd's unixsock plugin.
34 =head1 SYNOPSIS
36 use Collectd::Unixsock ();
38 my $sock = Collectd::Unixsock->new ($path);
40 my $value = $sock->getval (%identifier);
41 $sock->putval (%identifier,
42 time => time (),
43 values => [123, 234, 345]);
45 $sock->destroy ();
47 =head1 DESCRIPTION
49 collectd's unixsock plugin allows external programs to access the values it has
50 collected or received and to submit own values. This Perl-module is simply a
51 little abstraction layer over this interface to make it even easier for
52 programmers to interact with the daemon.
54 =cut
56 use strict;
57 use warnings;
59 #use constant { NOTIF_FAILURE => 1, NOTIF_WARNING => 2, NOTIF_OKAY => 4 };
61 use Carp (qw(cluck confess));
62 use IO::Socket::UNIX;
63 use Regexp::Common (qw(number));
65 our $Debug = 0;
67 return (1);
69 sub _debug
70 {
71 if (!$Debug)
72 {
73 return;
74 }
75 print @_;
76 }
78 sub _create_socket
79 {
80 my $path = shift;
81 my $sock = IO::Socket::UNIX->new (Type => SOCK_STREAM, Peer => $path);
82 if (!$sock)
83 {
84 cluck ("Cannot open UNIX-socket $path: $!");
85 return;
86 }
87 return ($sock);
88 } # _create_socket
90 =head1 VALUE IDENTIFIERS
92 The values in the collectd are identified using an five-tuple (host, plugin,
93 plugin-instance, type, type-instance) where only plugin-instance and
94 type-instance may be NULL (or undefined). Many functions expect an
95 I<%identifier> hash that has at least the members B<host>, B<plugin>, and
96 B<type>, possibly completed by B<plugin_instance> and B<type_instance>.
98 Usually you can pass this hash as follows:
100 $obj->method (host => $host, plugin => $plugin, type => $type, %other_args);
102 =cut
104 sub _create_identifier
105 {
106 my $args = shift;
107 my $host;
108 my $plugin;
109 my $type;
111 if (!$args->{'host'} || !$args->{'plugin'} || !$args->{'type'})
112 {
113 cluck ("Need `host', `plugin' and `type'");
114 return;
115 }
117 $host = $args->{'host'};
118 $plugin = $args->{'plugin'};
119 $plugin .= '-' . $args->{'plugin_instance'} if (defined ($args->{'plugin_instance'}));
120 $type = $args->{'type'};
121 $type .= '-' . $args->{'type_instance'} if (defined ($args->{'type_instance'}));
123 return ("$host/$plugin/$type");
124 } # _create_identifier
126 sub _parse_identifier
127 {
128 my $string = shift;
129 my $host;
130 my $plugin;
131 my $plugin_instance;
132 my $type;
133 my $type_instance;
134 my $ident;
136 ($host, $plugin, $type) = split ('/', $string);
138 ($plugin, $plugin_instance) = split ('-', $plugin, 2);
139 ($type, $type_instance) = split ('-', $type, 2);
141 $ident =
142 {
143 host => $host,
144 plugin => $plugin,
145 type => $type
146 };
147 $ident->{'plugin_instance'} = $plugin_instance if (defined ($plugin_instance));
148 $ident->{'type_instance'} = $type_instance if (defined ($type_instance));
150 return ($ident);
151 } # _parse_identifier
153 sub _escape_argument
154 {
155 my $string = shift;
157 if ($string =~ m/^\w+$/)
158 {
159 return ("$string");
160 }
162 $string =~ s#\\#\\\\#g;
163 $string =~ s#"#\\"#g;
164 $string = "\"$string\"";
166 return ($string);
167 }
169 =head1 PUBLIC METHODS
171 =over 4
173 =item I<$obj> = Collectd::Unixsock->B<new> ([I<$path>]);
175 Creates a new connection to the daemon. The optional I<$path> argument gives
176 the path to the UNIX socket of the C<unixsock plugin> and defaults to
177 F</var/run/collectd-unixsock>. Returns the newly created object on success and
178 false on error.
180 =cut
182 sub new
183 {
184 my $pkg = shift;
185 my $path = @_ ? shift : '/var/run/collectd-unixsock';
186 my $sock = _create_socket ($path) or return;
187 my $obj = bless (
188 {
189 path => $path,
190 sock => $sock,
191 error => 'No error'
192 }, $pkg);
193 return ($obj);
194 } # new
196 =item I<$res> = I<$obj>-E<gt>B<getval> (I<%identifier>);
198 Requests a value-list from the daemon. On success a hash-ref is returned with
199 the name of each data-source as the key and the according value as, well, the
200 value. On error false is returned.
202 =cut
204 sub getval # {{{
205 {
206 my $obj = shift;
207 my %args = @_;
209 my $status;
210 my $fh = $obj->{'sock'} or confess ('object has no filehandle');
211 my $msg;
212 my $identifier;
214 my $ret = {};
216 $identifier = _create_identifier (\%args) or return;
218 $msg = 'GETVAL ' . _escape_argument ($identifier) . "\n";
219 _debug "-> $msg";
220 print $fh $msg;
222 $msg = <$fh>;
223 chomp ($msg);
224 _debug "<- $msg\n";
226 ($status, $msg) = split (' ', $msg, 2);
227 if ($status <= 0)
228 {
229 $obj->{'error'} = $msg;
230 return;
231 }
233 for (my $i = 0; $i < $status; $i++)
234 {
235 my $entry = <$fh>;
236 chomp ($entry);
237 _debug "<- $entry\n";
239 if ($entry =~ m/^(\w+)=NaN$/)
240 {
241 $ret->{$1} = undef;
242 }
243 elsif ($entry =~ m/^(\w+)=($RE{num}{real})$/)
244 {
245 $ret->{$1} = 0.0 + $2;
246 }
247 }
249 return ($ret);
250 } # }}} sub getval
252 =item I<$res> = I<$obj>-E<gt>B<getthreshold> (I<%identifier>);
254 Requests a threshold from the daemon. On success a hash-ref is returned with
255 the threshold data. On error false is returned.
257 =cut
259 sub getthreshold # {{{
260 {
261 my $obj = shift;
262 my %args = @_;
264 my $status;
265 my $fh = $obj->{'sock'} or confess ('object has no filehandle');
266 my $msg;
267 my $identifier;
269 my $ret = {};
271 $identifier = _create_identifier (\%args) or return;
273 $msg = 'GETTHRESHOLD ' . _escape_argument ($identifier) . "\n";
274 _debug "-> $msg";
275 print $fh $msg;
277 $msg = <$fh>;
278 chomp ($msg);
279 _debug "<- $msg\n";
281 ($status, $msg) = split (' ', $msg, 2);
282 if ($status <= 0)
283 {
284 $obj->{'error'} = $msg;
285 return;
286 }
288 for (my $i = 0; $i < $status; $i++)
289 {
290 my $entry = <$fh>;
291 chomp ($entry);
292 _debug "<- $entry\n";
294 if ($entry =~ m/^([^:]+):\s*(\S.*)$/)
295 {
296 my $key = $1;
297 my $value = $2;
299 $key =~ s/^\s+//;
300 $key =~ s/\s+$//;
302 $ret->{$key} = $value;
303 }
304 }
306 return ($ret);
307 } # }}} sub getthreshold
309 =item I<$obj>-E<gt>B<putval> (I<%identifier>, B<time> =E<gt> I<$time>, B<values> =E<gt> [...]);
311 Submits a value-list to the daemon. If the B<time> argument is omitted
312 C<time()> is used. The required argument B<values> is a reference to an array
313 of values that is to be submitted. The number of values must match the number
314 of values expected for the given B<type> (see L<VALUE IDENTIFIERS>), though
315 this is checked by the daemon, not the Perl module. Also, gauge data-sources
316 (e.E<nbsp>g. system-load) may be C<undef>. Returns true upon success and false
317 otherwise.
319 =cut
321 sub putval
322 {
323 my $obj = shift;
324 my %args = @_;
326 my $status;
327 my $fh = $obj->{'sock'} or confess;
328 my $msg;
329 my $identifier;
330 my $values;
331 my $interval = "";
333 if (defined $args{'interval'})
334 {
335 $interval = ' interval='
336 . _escape_argument ($args{'interval'});
337 }
339 $identifier = _create_identifier (\%args) or return;
340 if (!$args{'values'})
341 {
342 cluck ("Need argument `values'");
343 return;
344 }
346 if (!ref ($args{'values'}))
347 {
348 $values = $args{'values'};
349 }
350 else
351 {
352 my $time;
354 if ("ARRAY" ne ref ($args{'values'}))
355 {
356 cluck ("Invalid `values' argument (expected an array ref)");
357 return;
358 }
360 if (! scalar @{$args{'values'}})
361 {
362 cluck ("Empty `values' array");
363 return;
364 }
366 $time = $args{'time'} ? $args{'time'} : time ();
367 $values = join (':', $time, map { defined ($_) ? $_ : 'U' } (@{$args{'values'}}));
368 }
370 $msg = 'PUTVAL '
371 . _escape_argument ($identifier)
372 . $interval
373 . ' ' . _escape_argument ($values) . "\n";
374 _debug "-> $msg";
375 print $fh $msg;
377 $msg = <$fh>;
378 chomp ($msg);
379 _debug "<- $msg\n";
381 ($status, $msg) = split (' ', $msg, 2);
382 return (1) if ($status == 0);
384 $obj->{'error'} = $msg;
385 return;
386 } # putval
388 =item I<$res> = I<$obj>-E<gt>B<listval> ()
390 Queries a list of values from the daemon. The list is returned as an array of
391 hash references, where each hash reference is a valid identifier. The C<time>
392 member of each hash holds the epoch value of the last update of that value.
394 =cut
396 sub listval
397 {
398 my $obj = shift;
399 my $msg;
400 my @ret = ();
401 my $status;
402 my $fh = $obj->{'sock'} or confess;
404 _debug "LISTVAL\n";
405 print $fh "LISTVAL\n";
407 $msg = <$fh>;
408 chomp ($msg);
409 _debug "<- $msg\n";
410 ($status, $msg) = split (' ', $msg, 2);
411 if ($status < 0)
412 {
413 $obj->{'error'} = $msg;
414 return;
415 }
417 for (my $i = 0; $i < $status; $i++)
418 {
419 my $time;
420 my $ident;
422 $msg = <$fh>;
423 chomp ($msg);
424 _debug "<- $msg\n";
426 ($time, $ident) = split (' ', $msg, 2);
428 $ident = _parse_identifier ($ident);
429 $ident->{'time'} = int ($time);
431 push (@ret, $ident);
432 } # for (i = 0 .. $status)
434 return (@ret);
435 } # listval
437 =item I<$res> = I<$obj>-E<gt>B<putnotif> (B<severity> =E<gt> I<$severity>, B<message> =E<gt> I<$message>, ...);
439 Submits a notification to the daemon.
441 Valid options are:
443 =over 4
445 =item B<severity>
447 Sets the severity of the notification. The value must be one of the following
448 strings: C<failure>, C<warning>, or C<okay>. Case does not matter. This option
449 is mandatory.
451 =item B<message>
453 Sets the message of the notification. This option is mandatory.
455 =item B<time>
457 Sets the time. If omitted, C<time()> is used.
459 =item I<Value identifier>
461 All the other fields of the value identifiers, B<host>, B<plugin>,
462 B<plugin_instance>, B<type>, and B<type_instance>, are optional. When given,
463 the notification is associated with the performance data of that identifier.
464 For more details, please see L<collectd-unixsock(5)>.
466 =back
468 =cut
470 sub putnotif
471 {
472 my $obj = shift;
473 my %args = @_;
475 my $status;
476 my $fh = $obj->{'sock'} or confess;
478 my $msg; # message sent to the socket
480 if (!$args{'message'})
481 {
482 cluck ("Need argument `message'");
483 return;
484 }
485 if (!$args{'severity'})
486 {
487 cluck ("Need argument `severity'");
488 return;
489 }
490 $args{'severity'} = lc ($args{'severity'});
491 if (($args{'severity'} ne 'failure')
492 && ($args{'severity'} ne 'warning')
493 && ($args{'severity'} ne 'okay'))
494 {
495 cluck ("Invalid `severity: " . $args{'severity'});
496 return;
497 }
499 if (!$args{'time'})
500 {
501 $args{'time'} = time ();
502 }
504 $msg = 'PUTNOTIF '
505 . join (' ', map { $_ . '=' . _escape_argument ($args{$_}) } (keys %args))
506 . "\n";
508 _debug "-> $msg";
509 print $fh $msg;
511 $msg = <$fh>;
512 chomp ($msg);
513 _debug "<- $msg\n";
515 ($status, $msg) = split (' ', $msg, 2);
516 return (1) if ($status == 0);
518 $obj->{'error'} = $msg;
519 return;
520 } # putnotif
522 =item I<$obj>-E<gt>B<flush> (B<timeout> =E<gt> I<$timeout>, B<plugins> =E<gt> [...], B<identifier> =E<gt> [...]);
524 Flush cached data.
526 Valid options are:
528 =over 4
530 =item B<timeout>
532 If this option is specified, only data older than I<$timeout> seconds is
533 flushed.
535 =item B<plugins>
537 If this option is specified, only the selected plugins will be flushed. The
538 argument is a reference to an array of strings.
540 =item B<identifier>
542 If this option is specified, only the given identifier(s) will be flushed. The
543 argument is a reference to an array of identifiers. Identifiers, in this case,
544 are hash references and have the members as outlined in L<VALUE IDENTIFIERS>.
546 =back
548 =cut
550 sub flush
551 {
552 my $obj = shift;
553 my %args = @_;
555 my $fh = $obj->{'sock'} or confess;
557 my $status = 0;
558 my $msg = "FLUSH";
560 if (defined ($args{'timeout'}))
561 {
562 $msg .= " timeout=" . $args{'timeout'};
563 }
565 if ($args{'plugins'})
566 {
567 foreach my $plugin (@{$args{'plugins'}})
568 {
569 $msg .= " plugin=" . $plugin;
570 }
571 }
573 if ($args{'identifier'})
574 {
575 for (@{$args{'identifier'}})
576 {
577 my $identifier = $_;
578 my $ident_str;
580 if (ref ($identifier) ne 'HASH')
581 {
582 cluck ("The argument of the `identifier' "
583 . "option must be an array reference "
584 . "of hash references.");
585 return;
586 }
588 $ident_str = _create_identifier ($identifier);
589 if (!$ident_str)
590 {
591 return;
592 }
594 $msg .= ' identifier=' . _escape_argument ($ident_str);
595 }
596 }
598 $msg .= "\n";
600 _debug "-> $msg";
601 print $fh $msg;
603 $msg = <$fh>;
604 chomp ($msg);
605 _debug "<- $msg\n";
607 ($status, $msg) = split (' ', $msg, 2);
608 return (1) if ($status == 0);
610 $obj->{'error'} = $msg;
611 return;
612 }
614 sub error
615 {
616 my $obj = shift;
617 if ($obj->{'error'})
618 {
619 return ($obj->{'error'});
620 }
621 return;
622 }
624 =item I<$obj>-E<gt>destroy ();
626 Closes the socket before the object is destroyed. This function is also
627 automatically called then the object goes out of scope.
629 =back
631 =cut
633 sub destroy
634 {
635 my $obj = shift;
636 if ($obj->{'sock'})
637 {
638 close ($obj->{'sock'});
639 delete ($obj->{'sock'});
640 }
641 }
643 sub DESTROY
644 {
645 my $obj = shift;
646 $obj->destroy ();
647 }
649 =head1 SEE ALSO
651 L<collectd(1)>,
652 L<collectd.conf(5)>,
653 L<collectd-unixsock(5)>
655 =head1 AUTHOR
657 Florian octo Forster E<lt>octo@collectd.orgE<gt>
659 =cut
661 # vim: set fdm=marker :