1 # collectd - Collectd.pm
2 # Copyright (C) 2007 Sebastian Harl
3 #
4 # This program is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License as published by the
6 # Free Software Foundation; only version 2 of the License is applicable.
7 #
8 # This program is distributed in the hope that it will be useful, but
9 # WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 # General Public License for more details.
12 #
13 # You should have received a copy of the GNU General Public License along
14 # with this program; if not, write to the Free Software Foundation, Inc.,
15 # 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16 #
17 # Author:
18 # Sebastian Harl <sh at tokkee.org>
20 package Collectd;
22 use strict;
23 use warnings;
25 use Config;
27 use threads;
28 use threads::shared;
30 BEGIN {
31 if (! $Config{'useithreads'}) {
32 die "Perl does not support ithreads!";
33 }
34 }
36 require Exporter;
38 our @ISA = qw( Exporter );
40 our %EXPORT_TAGS = (
41 'plugin' => [ qw(
42 plugin_register
43 plugin_unregister
44 plugin_dispatch_values
45 plugin_dispatch_notification
46 plugin_log
47 ) ],
48 'types' => [ qw(
49 TYPE_INIT
50 TYPE_READ
51 TYPE_WRITE
52 TYPE_SHUTDOWN
53 TYPE_LOG
54 TYPE_NOTIF
55 TYPE_DATASET
56 ) ],
57 'ds_types' => [ qw(
58 DS_TYPE_COUNTER
59 DS_TYPE_GAUGE
60 ) ],
61 'log' => [ qw(
62 ERROR
63 WARNING
64 NOTICE
65 INFO
66 DEBUG
67 LOG_ERR
68 LOG_WARNING
69 LOG_NOTICE
70 LOG_INFO
71 LOG_DEBUG
72 ) ],
73 'notif' => [ qw(
74 NOTIF_FAILURE
75 NOTIF_WARNING
76 NOTIF_OKAY
77 ) ],
78 'globals' => [ qw(
79 $hostname_g
80 $interval_g
81 ) ],
82 );
84 {
85 my %seen;
86 push @{$EXPORT_TAGS{'all'}}, grep {! $seen{$_}++ } @{$EXPORT_TAGS{$_}}
87 foreach keys %EXPORT_TAGS;
88 }
90 Exporter::export_ok_tags ('all');
92 my @plugins : shared = ();
94 my %types = (
95 TYPE_INIT, "init",
96 TYPE_READ, "read",
97 TYPE_WRITE, "write",
98 TYPE_SHUTDOWN, "shutdown",
99 TYPE_LOG, "log",
100 TYPE_NOTIF, "notify"
101 );
103 foreach my $type (keys %types) {
104 $plugins[$type] = &share ({});
105 }
107 sub _log {
108 my $caller = shift;
109 my $lvl = shift;
110 my $msg = shift;
112 if ("Collectd" eq $caller) {
113 $msg = "perl: $msg";
114 }
115 return plugin_log ($lvl, $msg);
116 }
118 sub ERROR { _log (scalar caller, LOG_ERR, shift); }
119 sub WARNING { _log (scalar caller, LOG_WARNING, shift); }
120 sub NOTICE { _log (scalar caller, LOG_NOTICE, shift); }
121 sub INFO { _log (scalar caller, LOG_INFO, shift); }
122 sub DEBUG { _log (scalar caller, LOG_DEBUG, shift); }
124 sub plugin_call_all {
125 my $type = shift;
127 our $cb_name = undef;
129 if (! defined $type) {
130 return;
131 }
133 if (TYPE_LOG != $type) {
134 DEBUG ("Collectd::plugin_call: type = \"$type\", args=\"@_\"");
135 }
137 if (! defined $plugins[$type]) {
138 ERROR ("Collectd::plugin_call: unknown type \"$type\"");
139 return;
140 }
142 lock @plugins;
143 foreach my $plugin (keys %{$plugins[$type]}) {
144 my $p = $plugins[$type]->{$plugin};
146 my $status = 0;
148 if ($p->{'wait_left'} > 0) {
149 # TODO: use interval_g
150 $p->{'wait_left'} -= 10;
151 }
153 next if ($p->{'wait_left'} > 0);
155 $cb_name = $p->{'cb_name'};
156 $status = call_by_name (@_);
158 if (! $status) {
159 my $err = undef;
161 if ($@) {
162 $err = $@;
163 }
164 else {
165 $err = "callback returned false";
166 }
168 if (TYPE_LOG != $type) {
169 ERROR ("Execution of callback \"$cb_name\" failed: $err");
170 }
172 $status = 0;
173 }
175 if ($status) {
176 $p->{'wait_left'} = 0;
177 $p->{'wait_time'} = 10;
178 }
179 elsif (TYPE_READ == $type) {
180 WARNING ("${plugin}->read() failed with status $status. "
181 . "Will suspend it for $p->{'wait_left'} seconds.");
183 $p->{'wait_left'} = $p->{'wait_time'};
184 $p->{'wait_time'} *= 2;
186 if ($p->{'wait_time'} > 86400) {
187 $p->{'wait_time'} = 86400;
188 }
189 }
190 elsif (TYPE_INIT == $type) {
191 ERROR ("${plugin}->init() failed with status $status. "
192 . "Plugin will be disabled.");
194 foreach my $type (keys %types) {
195 plugin_unregister ($type, $plugin);
196 }
197 }
198 elsif (TYPE_LOG != $type) {
199 WARNING ("${plugin}->$types{$type}() failed with status $status.");
200 }
201 }
202 return 1;
203 }
205 # Collectd::plugin_register (type, name, data).
206 #
207 # type:
208 # init, read, write, shutdown, data set
209 #
210 # name:
211 # name of the plugin
212 #
213 # data:
214 # reference to the plugin's subroutine that does the work or the data set
215 # definition
216 sub plugin_register {
217 my $type = shift;
218 my $name = shift;
219 my $data = shift;
221 DEBUG ("Collectd::plugin_register: "
222 . "type = \"$type\", name = \"$name\", data = \"$data\"");
224 if (! ((defined $type) && (defined $name) && (defined $data))) {
225 ERROR ("Usage: Collectd::plugin_register (type, name, data)");
226 return;
227 }
229 if ((! defined $plugins[$type]) && (TYPE_DATASET != $type)) {
230 ERROR ("Collectd::plugin_register: Invalid type \"$type\"");
231 return;
232 }
234 if ((TYPE_DATASET == $type) && ("ARRAY" eq ref $data)) {
235 return plugin_register_data_set ($name, $data);
236 }
237 elsif ((TYPE_DATASET != $type) && (! ref $data)) {
238 my $pkg = scalar caller;
240 my %p : shared;
242 if ($data !~ m/^$pkg/) {
243 $data = $pkg . "::" . $data;
244 }
246 # TODO: make interval_g available at configuration time
247 %p = (
248 wait_time => 10,
249 wait_left => 0,
250 cb_name => $data,
251 );
253 lock @plugins;
254 $plugins[$type]->{$name} = \%p;
255 }
256 else {
257 ERROR ("Collectd::plugin_register: Invalid data.");
258 return;
259 }
260 return 1;
261 }
263 sub plugin_unregister {
264 my $type = shift;
265 my $name = shift;
267 DEBUG ("Collectd::plugin_unregister: type = \"$type\", name = \"$name\"");
269 if (! ((defined $type) && (defined $name))) {
270 ERROR ("Usage: Collectd::plugin_unregister (type, name)");
271 return;
272 }
274 if (TYPE_DATASET == $type) {
275 return plugin_unregister_data_set ($name);
276 }
277 elsif (defined $plugins[$type]) {
278 lock @plugins;
279 delete $plugins[$type]->{$name};
280 }
281 else {
282 ERROR ("Collectd::plugin_unregister: Invalid type.");
283 return;
284 }
285 }
287 1;
289 # vim: set sw=4 ts=4 tw=78 noexpandtab :