1 /**
2 * collectd - src/log_logstash.c
3 * Copyright (C) 2013 Pierre-Yves Ritschard
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Pierre-Yves Ritschard <pyr at spootnik.org>
20 * Acknowledgements:
21 * This file is largely inspired by logfile.c
22 **/
24 #include "collectd.h"
25 #include "common.h"
26 #include "plugin.h"
28 #include <sys/types.h>
29 #include <pthread.h>
30 #include <yajl/yajl_common.h>
31 #include <yajl/yajl_gen.h>
32 #if HAVE_YAJL_YAJL_VERSION_H
33 # include <yajl/yajl_version.h>
34 #endif
35 #if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
36 # define HAVE_YAJL_V2 1
37 #endif
39 #define DEFAULT_LOGFILE LOCALSTATEDIR"/log/collectd.json.log"
41 #if COLLECT_DEBUG
42 static int log_level = LOG_DEBUG;
43 #else
44 static int log_level = LOG_INFO;
45 #endif /* COLLECT_DEBUG */
47 static pthread_mutex_t file_lock = PTHREAD_MUTEX_INITIALIZER;
49 static char *log_file = NULL;
51 static const char *config_keys[] =
52 {
53 "LogLevel",
54 "File"
55 };
56 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
58 static int log_logstash_config (const char *key, const char *value)
59 {
61 if (0 == strcasecmp (key, "LogLevel")) {
62 log_level = parse_log_severity(value);
63 printf("parsed log level: %d\n", log_level);
64 if (log_level == -1) return 1; /* to keep previous behaviour */
65 }
66 else if (0 == strcasecmp (key, "File")) {
67 sfree (log_file);
68 log_file = strdup (value);
69 }
70 else {
71 return -1;
72 }
73 return 0;
74 } /* int log_logstash_config (const char *, const char *) */
76 static void log_logstash_print (yajl_gen g, int severity,
77 cdtime_t timestamp_time)
78 {
79 FILE *fh;
80 _Bool do_close = 0;
81 struct tm timestamp_tm;
82 char timestamp_str[64];
83 const unsigned char *buf;
84 time_t tt;
85 #if HAVE_YAJL_V2
86 size_t len;
87 #else
88 unsigned int len;
89 #endif
91 if (yajl_gen_string(g, (u_char *)"@level", strlen("@level")) !=
92 yajl_gen_status_ok)
93 goto err;
95 switch (severity) {
96 case LOG_ERR:
97 if (yajl_gen_string(g, (u_char *)"error", strlen("error")) !=
98 yajl_gen_status_ok)
99 goto err;
100 break;
101 case LOG_WARNING:
102 if (yajl_gen_string(g, (u_char *)"warning",
103 strlen("warning")) !=
104 yajl_gen_status_ok)
105 goto err;
106 break;
107 case LOG_NOTICE:
108 if (yajl_gen_string(g, (u_char *)"notice", strlen("notice")) !=
109 yajl_gen_status_ok)
110 goto err;
111 break;
112 case LOG_INFO:
113 if (yajl_gen_string(g, (u_char *)"info", strlen("info")) !=
114 yajl_gen_status_ok)
115 goto err;
116 break;
117 case LOG_DEBUG:
118 if (yajl_gen_string(g, (u_char *)"debug", strlen("debug")) !=
119 yajl_gen_status_ok)
120 goto err;
121 break;
122 default:
123 if (yajl_gen_string(g, (u_char *)"unknown",
124 strlen("unknown")) !=
125 yajl_gen_status_ok)
126 goto err;
127 break;
128 }
130 if (yajl_gen_string(g, (u_char *)"@timestamp", strlen("@timestamp")) !=
131 yajl_gen_status_ok)
132 goto err;
134 tt = CDTIME_T_TO_TIME_T (timestamp_time);
135 gmtime_r (&tt, ×tamp_tm);
137 /*
138 * format time as a UTC ISO 8601 compliant string
139 */
140 strftime (timestamp_str, sizeof (timestamp_str),
141 "%Y-%m-%d %H:%M:%SZ", ×tamp_tm);
142 timestamp_str[sizeof (timestamp_str) - 1] = '\0';
144 if (yajl_gen_string(g, (u_char *)timestamp_str,
145 strlen(timestamp_str)) !=
146 yajl_gen_status_ok)
147 goto err;
149 if (yajl_gen_map_close(g) != yajl_gen_status_ok)
150 goto err;
152 if (yajl_gen_get_buf(g, &buf, &len) != yajl_gen_status_ok)
153 goto err;
154 pthread_mutex_lock (&file_lock);
156 if (log_file == NULL)
157 {
158 fh = fopen (DEFAULT_LOGFILE, "a");
159 do_close = 1;
160 } else if (strcasecmp(log_file, "stdout") == 0) {
161 fh = stdout;
162 do_close = 0;
163 } else if (strcasecmp(log_file, "stderr") == 0) {
164 fh = stderr;
165 do_close = 0;
166 } else {
167 fh = fopen (log_file, "a");
168 do_close = 1;
169 }
171 if (fh == NULL)
172 {
173 char errbuf[1024];
174 fprintf (stderr, "log_logstash plugin: fopen (%s) failed: %s\n",
175 (log_file == NULL) ? DEFAULT_LOGFILE : log_file,
176 sstrerror (errno, errbuf, sizeof (errbuf)));
177 }
178 else
179 {
180 fprintf(fh, "%s\n", buf);
181 if (do_close) {
182 fclose (fh);
183 } else {
184 fflush(fh);
185 }
186 }
187 pthread_mutex_unlock (&file_lock);
188 yajl_gen_free(g);
189 return;
191 err:
192 yajl_gen_free(g);
193 fprintf(stderr, "Could not correctly generate JSON message\n");
194 return;
195 } /* void log_logstash_print */
197 static void log_logstash_log (int severity, const char *msg,
198 user_data_t __attribute__((unused)) *user_data)
199 {
200 yajl_gen g;
201 #if !defined(HAVE_YAJL_V2)
202 yajl_gen_config conf;
204 conf.beautify = 0;
205 #endif
207 if (severity > log_level)
208 return;
210 #if HAVE_YAJL_V2
211 g = yajl_gen_alloc(NULL);
212 #else
213 g = yajl_gen_alloc(&conf, NULL);
214 #endif
216 if (g == NULL) {
217 fprintf(stderr, "Could not allocate JSON generator.\n");
218 return;
219 }
221 if (yajl_gen_map_open(g) != yajl_gen_status_ok)
222 goto err;
223 if (yajl_gen_string(g, (u_char *)"@message", strlen("@message")) !=
224 yajl_gen_status_ok)
225 goto err;
226 if (yajl_gen_string(g, (u_char *)msg, strlen(msg)) !=
227 yajl_gen_status_ok)
228 goto err;
230 log_logstash_print (g, severity, cdtime ());
231 return;
232 err:
233 yajl_gen_free(g);
234 fprintf(stderr, "Could not generate JSON message preamble\n");
235 return;
237 } /* void log_logstash_log (int, const char *) */
239 static int log_logstash_notification (const notification_t *n,
240 user_data_t __attribute__((unused)) *user_data)
241 {
242 yajl_gen g;
243 #if HAVE_YAJL_V2
244 g = yajl_gen_alloc(NULL);
245 #else
246 yajl_gen_config conf;
248 conf.beautify = 0;
249 g = yajl_gen_alloc(&conf, NULL);
250 #endif
252 if (g == NULL) {
253 fprintf(stderr, "Could not allocate JSON generator.\n");
254 return (0);
255 }
257 if (yajl_gen_map_open(g) != yajl_gen_status_ok)
258 goto err;
259 if (yajl_gen_string(g, (u_char *)"@message", strlen("@message")) !=
260 yajl_gen_status_ok)
261 goto err;
262 if (strlen(n->message) > 0) {
263 if (yajl_gen_string(g, (u_char *)n->message,
264 strlen(n->message)) !=
265 yajl_gen_status_ok)
266 goto err;
267 } else {
268 if (yajl_gen_string(g, (u_char *)"notification without a message",
269 strlen("notification without a message")) !=
270 yajl_gen_status_ok)
271 goto err;
272 }
275 if (yajl_gen_string(g, (u_char *)"@fields", strlen("@fields")) !=
276 yajl_gen_status_ok)
277 goto err;
278 if (yajl_gen_map_open(g) !=
279 yajl_gen_status_ok)
280 goto err;
282 if (strlen(n->host) > 0) {
283 if (yajl_gen_string(g, (u_char *)"host", strlen("host")) !=
284 yajl_gen_status_ok)
285 goto err;
286 if (yajl_gen_string(g, (u_char *)n->host, strlen(n->host)) !=
287 yajl_gen_status_ok)
288 goto err;
290 }
291 if (strlen(n->plugin) > 0) {
292 if (yajl_gen_string(g, (u_char *)"plugin", strlen("plugin")) !=
293 yajl_gen_status_ok)
294 goto err;
295 if (yajl_gen_string(g, (u_char *)n->plugin, strlen(n->plugin)) !=
296 yajl_gen_status_ok)
297 goto err;
298 }
299 if (strlen(n->plugin_instance) > 0) {
300 if (yajl_gen_string(g, (u_char *)"plugin_instance",
301 strlen("plugin_instance")) !=
302 yajl_gen_status_ok)
303 goto err;
304 if (yajl_gen_string(g, (u_char *)n->plugin_instance,
305 strlen(n->plugin_instance)) !=
306 yajl_gen_status_ok)
307 goto err;
308 }
309 if (strlen(n->type) > 0) {
310 if (yajl_gen_string(g, (u_char *)"type", strlen("type")) !=
311 yajl_gen_status_ok)
312 goto err;
313 if (yajl_gen_string(g, (u_char *)n->type, strlen(n->type)) !=
314 yajl_gen_status_ok)
315 goto err;
316 }
317 if (strlen(n->type_instance) > 0) {
318 if (yajl_gen_string(g, (u_char *)"type_instance",
319 strlen("type_instance")) !=
320 yajl_gen_status_ok)
321 goto err;
322 if (yajl_gen_string(g, (u_char *)n->type_instance,
323 strlen(n->type_instance)) !=
324 yajl_gen_status_ok)
325 goto err;
326 }
328 if (yajl_gen_string(g, (u_char *)"severity",
329 strlen("severity")) !=
330 yajl_gen_status_ok)
331 goto err;
333 switch (n->severity) {
334 case NOTIF_FAILURE:
335 if (yajl_gen_string(g, (u_char *)"failure",
336 strlen("failure")) !=
337 yajl_gen_status_ok)
338 goto err;
339 break;
340 case NOTIF_WARNING:
341 if (yajl_gen_string(g, (u_char *)"warning",
342 strlen("warning")) !=
343 yajl_gen_status_ok)
344 goto err;
345 break;
346 case NOTIF_OKAY:
347 if (yajl_gen_string(g, (u_char *)"ok",
348 strlen("ok")) !=
349 yajl_gen_status_ok)
350 goto err;
351 break;
352 default:
353 if (yajl_gen_string(g, (u_char *)"unknown",
354 strlen("unknown")) !=
355 yajl_gen_status_ok)
356 goto err;
357 break;
358 }
359 if (yajl_gen_map_close(g) != yajl_gen_status_ok)
360 goto err;
362 log_logstash_print (g, LOG_INFO, (n->time != 0) ? n->time : cdtime ());
363 return (0);
365 err:
366 yajl_gen_free(g);
367 fprintf(stderr, "Could not correctly generate JSON notification\n");
368 return (0);
369 } /* int log_logstash_notification */
371 void module_register (void)
372 {
373 plugin_register_config ("log_logstash",
374 log_logstash_config,
375 config_keys,
376 config_keys_num);
377 plugin_register_log ("log_logstash",
378 log_logstash_log,
379 /* user_data = */ NULL);
380 plugin_register_notification ("log_logstash",
381 log_logstash_notification,
382 /* user_data = */ NULL);
383 } /* void module_register (void) */
385 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */