1 /**
2 * collectd - src/threshold.c
3 * Copyright (C) 2007-2010 Florian Forster
4 * Copyright (C) 2008-2009 Sebastian Harl
5 * Copyright (C) 2009 Andrés J. Díaz
6 * Copyright (C) 2014 Pierre-Yves Ritschard
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; only version 2 of the License is applicable.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * Author:
22 * Pierre-Yves Ritschard <pyr at spootnik.org>
23 * Florian octo Forster <octo at collectd.org>
24 * Sebastian Harl <sh at tokkee.org>
25 * Andrés J. Díaz <ajdiaz at connectical.com>
26 **/
28 #include <assert.h>
29 #include <ltdl.h>
30 #include <pthread.h>
32 #include "collectd.h"
33 #include "common.h"
34 #include "plugin.h"
35 #include "utils_avltree.h"
36 #include "utils_cache.h"
37 #include "utils_threshold.h"
38 #include "write_riemann_threshold.h"
40 /*
41 * Threshold management
42 * ====================
43 * The following functions add, delete, etc. configured thresholds to
44 * the underlying AVL trees.
45 */
47 /*
48 * int ut_check_one_data_source
49 *
50 * Checks one data source against the given threshold configuration. If the
51 * `DataSource' option is set in the threshold, and the name does NOT match,
52 * `okay' is returned. If the threshold does match, its failure and warning
53 * min and max values are checked and `failure' or `warning' is returned if
54 * appropriate.
55 * Does not fail.
56 */
57 static int ut_check_one_data_source (const data_set_t *ds,
58 const value_list_t __attribute__((unused)) *vl,
59 const threshold_t *th,
60 const gauge_t *values,
61 int ds_index)
62 { /* {{{ */
63 const char *ds_name;
64 int is_warning = 0;
65 int is_failure = 0;
66 int prev_state = STATE_OKAY;
68 /* check if this threshold applies to this data source */
69 if (ds != NULL)
70 {
71 ds_name = ds->ds[ds_index].name;
72 if ((th->data_source[0] != 0)
73 && (strcmp (ds_name, th->data_source) != 0))
74 return (STATE_OKAY);
75 }
77 if ((th->flags & UT_FLAG_INVERT) != 0)
78 {
79 is_warning--;
80 is_failure--;
81 }
83 /* XXX: This is an experimental code, not optimized, not fast, not reliable,
84 * and probably, do not work as you expect. Enjoy! :D */
85 if ( (th->hysteresis > 0) && ((prev_state = uc_get_state(ds,vl)) != STATE_OKAY) )
86 {
87 switch(prev_state)
88 {
89 case STATE_ERROR:
90 if ( (!isnan (th->failure_min) && ((th->failure_min + th->hysteresis) < values[ds_index])) ||
91 (!isnan (th->failure_max) && ((th->failure_max - th->hysteresis) > values[ds_index])) )
92 return (STATE_OKAY);
93 else
94 is_failure++;
95 case STATE_WARNING:
96 if ( (!isnan (th->warning_min) && ((th->warning_min + th->hysteresis) < values[ds_index])) ||
97 (!isnan (th->warning_max) && ((th->warning_max - th->hysteresis) > values[ds_index])) )
98 return (STATE_OKAY);
99 else
100 is_warning++;
101 }
102 }
103 else { /* no hysteresis */
104 if ((!isnan (th->failure_min) && (th->failure_min > values[ds_index]))
105 || (!isnan (th->failure_max) && (th->failure_max < values[ds_index])))
106 is_failure++;
108 if ((!isnan (th->warning_min) && (th->warning_min > values[ds_index]))
109 || (!isnan (th->warning_max) && (th->warning_max < values[ds_index])))
110 is_warning++;
111 }
113 if (is_failure != 0)
114 return (STATE_ERROR);
116 if (is_warning != 0)
117 return (STATE_WARNING);
119 return (STATE_OKAY);
120 } /* }}} int ut_check_one_data_source */
122 /*
123 * int ut_check_one_threshold
124 *
125 * Checks all data sources of a value list against the given threshold, using
126 * the ut_check_one_data_source function above. Returns the worst status,
127 * which is `okay' if nothing has failed.
128 * Returns less than zero if the data set doesn't have any data sources.
129 */
130 static int ut_check_one_threshold (const data_set_t *ds,
131 const value_list_t *vl,
132 const threshold_t *th,
133 const gauge_t *values,
134 int *statuses)
135 { /* {{{ */
136 int ret = -1;
137 size_t i;
138 int status;
139 gauge_t values_copy[ds->ds_num];
141 memcpy (values_copy, values, sizeof (values_copy));
143 if ((th->flags & UT_FLAG_PERCENTAGE) != 0)
144 {
145 int num = 0;
146 gauge_t sum=0.0;
148 if (ds->ds_num == 1)
149 {
150 WARNING ("ut_check_one_threshold: The %s type has only one data "
151 "source, but you have configured to check this as a percentage. "
152 "That doesn't make much sense, because the percentage will always "
153 "be 100%%!", ds->type);
154 }
156 /* Prepare `sum' and `num'. */
157 for (i = 0; i < ds->ds_num; i++)
158 if (!isnan (values[i]))
159 {
160 num++;
161 sum += values[i];
162 }
164 if ((num == 0) /* All data sources are undefined. */
165 || (sum == 0.0)) /* Sum is zero, cannot calculate percentage. */
166 {
167 for (i = 0; i < ds->ds_num; i++)
168 values_copy[i] = NAN;
169 }
170 else /* We can actually calculate the percentage. */
171 {
172 for (i = 0; i < ds->ds_num; i++)
173 values_copy[i] = 100.0 * values[i] / sum;
174 }
175 } /* if (UT_FLAG_PERCENTAGE) */
177 for (i = 0; i < ds->ds_num; i++)
178 {
179 status = ut_check_one_data_source (ds, vl, th, values_copy, i);
180 if (status != -1) {
181 ret = 0;
182 if (statuses[i] < status)
183 statuses[i] = status;
184 }
185 } /* for (ds->ds_num) */
187 return (ret);
188 } /* }}} int ut_check_one_threshold */
190 /*
191 * int ut_check_threshold
192 *
193 * Gets a list of matching thresholds and searches for the worst status by one
194 * of the thresholds. Then reports that status using the ut_report_state
195 * function above.
196 * Returns zero on success and if no threshold has been configured. Returns
197 * less than zero on failure.
198 */
199 int write_riemann_threshold_check (const data_set_t *ds, const value_list_t *vl,
200 int *statuses)
201 { /* {{{ */
202 threshold_t *th;
203 gauge_t *values;
204 int status;
206 assert (vl->values_len > 0);
207 memset(statuses, 0, vl->values_len * sizeof(*statuses));
209 if (threshold_tree == NULL)
210 return 0;
212 /* Is this lock really necessary? So far, thresholds are only inserted at
213 * startup. -octo */
214 pthread_mutex_lock (&threshold_lock);
215 th = threshold_search (vl);
216 pthread_mutex_unlock (&threshold_lock);
217 if (th == NULL)
218 return (0);
220 DEBUG ("ut_check_threshold: Found matching threshold(s)");
222 values = uc_get_rate (ds, vl);
223 if (values == NULL)
224 return (0);
226 while (th != NULL)
227 {
228 status = ut_check_one_threshold (ds, vl, th, values, statuses);
229 if (status < 0)
230 {
231 ERROR ("ut_check_threshold: ut_check_one_threshold failed.");
232 sfree (values);
233 return (-1);
234 }
236 th = th->next;
237 } /* while (th) */
239 sfree (values);
241 return (0);
242 } /* }}} int ut_check_threshold */
245 /* vim: set sw=2 ts=8 sts=2 tw=78 et fdm=marker : */