2 * collectd - src/utils_match.c
3 * Copyright (C) 2008-2014 Florian octo Forster
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21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
32 #include "utils_match.h"
36 #define UTILS_MATCH_FLAGS_EXCLUDE_REGEX 0x02
44 int (*callback) (const char *str, char * const *matches, size_t matches_num,
47 void (*free) (void *user_data);
53 static char *match_substr (const char *str, int begin, int end)
58 if ((begin < 0) || (end < 0) || (begin >= end))
60 if ((size_t) end > (strlen (str) + 1))
62 ERROR ("utils_match: match_substr: `end' points after end of string.");
66 ret_len = end - begin;
67 ret = malloc (ret_len + 1);
70 ERROR ("utils_match: match_substr: malloc failed.");
74 sstrncpy (ret, str + begin, ret_len + 1);
76 } /* char *match_substr */
78 static int default_callback (const char __attribute__((unused)) *str,
79 char * const *matches, size_t matches_num, void *user_data)
81 cu_match_value_t *data = (cu_match_value_t *) user_data;
83 if (data->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
88 if (data->ds_type & UTILS_MATCH_CF_GAUGE_INC)
90 data->value.gauge = isnan (data->value.gauge) ? 1 : data->value.gauge + 1;
98 value = (gauge_t) strtod (matches[1], &endptr);
99 if (matches[1] == endptr)
102 if (data->ds_type & UTILS_MATCH_CF_GAUGE_DIST)
104 latency_counter_add(data->latency, DOUBLE_TO_CDTIME_T(value));
109 if ((data->values_num == 0)
110 || (data->ds_type & UTILS_MATCH_CF_GAUGE_LAST)
111 || (data->ds_type & UTILS_MATCH_CF_GAUGE_PERSIST))
113 data->value.gauge = value;
115 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_AVERAGE)
117 double f = ((double) data->values_num)
118 / ((double) (data->values_num + 1));
119 data->value.gauge = (data->value.gauge * f) + (value * (1.0 - f));
121 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MIN)
123 if (data->value.gauge > value)
124 data->value.gauge = value;
126 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_MAX)
128 if (data->value.gauge < value)
129 data->value.gauge = value;
131 else if (data->ds_type & UTILS_MATCH_CF_GAUGE_ADD)
133 data->value.gauge += value;
137 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
143 else if (data->ds_type & UTILS_MATCH_DS_TYPE_COUNTER)
148 if (data->ds_type & UTILS_MATCH_CF_COUNTER_INC)
150 data->value.counter++;
158 value = (counter_t) strtoull (matches[1], &endptr, 0);
159 if (matches[1] == endptr)
162 if (data->ds_type & UTILS_MATCH_CF_COUNTER_SET)
163 data->value.counter = value;
164 else if (data->ds_type & UTILS_MATCH_CF_COUNTER_ADD)
165 data->value.counter += value;
168 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
174 else if (data->ds_type & UTILS_MATCH_DS_TYPE_DERIVE)
179 if (data->ds_type & UTILS_MATCH_CF_DERIVE_INC)
181 data->value.derive++;
189 value = (derive_t) strtoll (matches[1], &endptr, 0);
190 if (matches[1] == endptr)
193 if (data->ds_type & UTILS_MATCH_CF_DERIVE_SET)
194 data->value.derive = value;
195 else if (data->ds_type & UTILS_MATCH_CF_DERIVE_ADD)
196 data->value.derive += value;
199 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
205 else if (data->ds_type & UTILS_MATCH_DS_TYPE_ABSOLUTE)
213 value = (absolute_t) strtoull (matches[1], &endptr, 0);
214 if (matches[1] == endptr)
217 if (data->ds_type & UTILS_MATCH_CF_ABSOLUTE_SET)
218 data->value.absolute = value;
221 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
229 ERROR ("utils_match: default_callback: obj->ds_type is invalid!");
234 } /* int default_callback */
236 static void match_simple_free (void *data)
238 cu_match_value_t *user_data = (cu_match_value_t *) data;
239 if (user_data->latency)
240 latency_counter_destroy(user_data->latency);
243 } /* void match_simple_free */
248 cu_match_t *match_create_callback (const char *regex, const char *excluderegex,
249 int (*callback) (const char *str,
250 char * const *matches, size_t matches_num, void *user_data),
251 void *user_data, void (*free_user_data) (void *user_data))
256 DEBUG ("utils_match: match_create_callback: regex = %s, excluderegex = %s",
257 regex, excluderegex);
259 obj = calloc (1, sizeof (*obj));
263 status = regcomp (&obj->regex, regex, REG_EXTENDED | REG_NEWLINE);
266 ERROR ("Compiling the regular expression \"%s\" failed.", regex);
271 if (excluderegex && strcmp(excluderegex, "") != 0) {
272 status = regcomp (&obj->excluderegex, excluderegex, REG_EXTENDED);
275 ERROR ("Compiling the excluding regular expression \"%s\" failed.",
280 obj->flags |= UTILS_MATCH_FLAGS_EXCLUDE_REGEX;
283 obj->callback = callback;
284 obj->user_data = user_data;
285 obj->free = free_user_data;
288 } /* cu_match_t *match_create_callback */
290 cu_match_t *match_create_simple (const char *regex,
291 const char *excluderegex, int match_ds_type)
293 cu_match_value_t *user_data;
296 user_data = calloc (1, sizeof (*user_data));
297 if (user_data == NULL)
299 user_data->ds_type = match_ds_type;
301 if ((match_ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
302 && (match_ds_type & UTILS_MATCH_CF_GAUGE_DIST))
304 user_data->latency = latency_counter_create();
305 if (user_data->latency == NULL)
307 ERROR ("match_create_simple(): latency_counter_create() failed.");
313 obj = match_create_callback (regex, excluderegex,
314 default_callback, user_data, match_simple_free);
317 if (user_data->latency)
318 latency_counter_destroy(user_data->latency);
324 } /* cu_match_t *match_create_simple */
326 void match_value_reset (cu_match_value_t *mv)
331 /* Reset GAUGE metrics only and except GAUGE_PERSIST. */
332 if ((mv->ds_type & UTILS_MATCH_DS_TYPE_GAUGE)
333 && !(mv->ds_type & UTILS_MATCH_CF_GAUGE_PERSIST))
335 mv->value.gauge = NAN;
338 } /* }}} void match_value_reset */
340 void match_destroy (cu_match_t *obj)
345 if ((obj->user_data != NULL) && (obj->free != NULL))
346 (*obj->free) (obj->user_data);
349 } /* void match_destroy */
351 int match_apply (cu_match_t *obj, const char *str)
354 regmatch_t re_match[32];
355 char *matches[32] = { 0 };
358 if ((obj == NULL) || (str == NULL))
361 if (obj->flags & UTILS_MATCH_FLAGS_EXCLUDE_REGEX) {
362 status = regexec (&obj->excluderegex, str,
363 STATIC_ARRAY_SIZE (re_match), re_match,
365 /* Regex did match, so exclude this line */
367 DEBUG("ExludeRegex matched, don't count that line\n");
372 status = regexec (&obj->regex, str,
373 STATIC_ARRAY_SIZE (re_match), re_match,
376 /* Regex did not match */
380 for (matches_num = 0; matches_num < STATIC_ARRAY_SIZE (matches); matches_num++)
382 if ((re_match[matches_num].rm_so < 0)
383 || (re_match[matches_num].rm_eo < 0))
386 matches[matches_num] = match_substr (str,
387 re_match[matches_num].rm_so, re_match[matches_num].rm_eo);
388 if (matches[matches_num] == NULL)
397 ERROR ("utils_match: match_apply: match_substr failed.");
401 status = obj->callback (str, matches, matches_num, obj->user_data);
404 ERROR ("utils_match: match_apply: callback failed.");
408 for (size_t i = 0; i < matches_num; i++)
414 } /* int match_apply */
416 void *match_get_user_data (cu_match_t *obj)
420 return (obj->user_data);
421 } /* void *match_get_user_data */
423 /* vim: set sw=2 sts=2 ts=8 : */