ba76d71f6c727e4f1b19a5514e74e1e6eb36926e
1 /**
2 * collectd - src/write_kafka.c
3 * Copyright (C) 2014 Pierre-Yves Ritschard
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 * Pierre-Yves Ritschard <pyr at spootnik.org>
25 */
27 #include "collectd.h"
28 #include "plugin.h"
29 #include "common.h"
30 #include "configfile.h"
31 #include "utils_cache.h"
32 #include "utils_cmd_putval.h"
33 #include "utils_format_graphite.h"
34 #include "utils_format_json.h"
35 #include "utils_crc32.h"
37 #include <sys/types.h>
38 #include <librdkafka/rdkafka.h>
39 #include <pthread.h>
40 #include <zlib.h>
42 struct kafka_topic_context {
43 #define KAFKA_FORMAT_JSON 0
44 #define KAFKA_FORMAT_COMMAND 1
45 #define KAFKA_FORMAT_GRAPHITE 2
46 u_int8_t format;
47 unsigned int graphite_flags;
48 _Bool store_rates;
49 rd_kafka_topic_conf_t *conf;
50 rd_kafka_topic_t *topic;
51 rd_kafka_t *kafka;
52 int has_key;
53 u_int32_t key;
54 char *prefix;
55 char *postfix;
56 char escape_char;
57 char *topic_name;
58 };
60 static int kafka_write(const data_set_t *, const value_list_t *, user_data_t *);
61 static int32_t kafka_partition(const rd_kafka_topic_t *, const void *, size_t,
62 int32_t, void *, void *);
64 #if defined HAVE_LIBRDKAFKA_LOGGER || defined HAVE_LIBRDKAFKA_LOG_CB
65 static void kafka_log(const rd_kafka_t *, int, const char *, const char *);
67 static void kafka_log(const rd_kafka_t *rkt, int level,
68 const char *fac, const char *msg)
69 {
70 plugin_log(level, "%s", msg);
71 }
72 #endif
74 static int32_t kafka_partition(const rd_kafka_topic_t *rkt,
75 const void *keydata, size_t keylen,
76 int32_t partition_cnt, void *p, void *m)
77 {
78 u_int32_t key = *((u_int32_t *)keydata );
80 return key % partition_cnt;
81 }
83 static int kafka_write(const data_set_t *ds, /* {{{ */
84 const value_list_t *vl,
85 user_data_t *ud)
86 {
87 int status = 0;
88 u_int32_t key;
89 char buffer[8192];
90 size_t bfree = sizeof(buffer);
91 size_t bfill = 0;
92 size_t blen = 0;
93 struct kafka_topic_context *ctx = ud->data;
95 if ((ds == NULL) || (vl == NULL) || (ctx == NULL))
96 return EINVAL;
98 bzero(buffer, sizeof(buffer));
100 switch (ctx->format) {
101 case KAFKA_FORMAT_COMMAND:
102 status = create_putval(buffer, sizeof(buffer), ds, vl);
103 if (status != 0) {
104 ERROR("write_kafka plugin: create_putval failed with status %i.",
105 status);
106 return status;
107 }
108 blen = strlen(buffer);
109 break;
110 case KAFKA_FORMAT_JSON:
112 format_json_initialize(buffer, &bfill, &bfree);
113 format_json_value_list(buffer, &bfill, &bfree, ds, vl,
114 ctx->store_rates);
115 format_json_finalize(buffer, &bfill, &bfree);
116 blen = strlen(buffer);
117 break;
118 case KAFKA_FORMAT_GRAPHITE:
119 status = format_graphite(buffer, sizeof(buffer), ds, vl,
120 ctx->prefix, ctx->postfix, ctx->escape_char,
121 ctx->graphite_flags);
122 if (status != 0) {
123 ERROR("write_kafka plugin: format_graphite failed with status %i.",
124 status);
125 return status;
126 }
127 blen = strlen(buffer);
128 break;
129 default:
130 ERROR("write_kafka plugin: invalid format %i.", ctx->format);
131 return -1;
132 }
134 /*
135 * We partition our stream by metric name
136 */
137 if (ctx->has_key)
138 key = ctx->key;
139 else
140 key = rand();
142 rd_kafka_produce(ctx->topic, RD_KAFKA_PARTITION_UA,
143 RD_KAFKA_MSG_F_COPY, buffer, blen,
144 &key, sizeof(key), NULL);
146 return status;
147 } /* }}} int kafka_write */
149 static void kafka_topic_context_free(void *p) /* {{{ */
150 {
151 struct kafka_topic_context *ctx = p;
153 if (ctx == NULL)
154 return;
156 if (ctx->topic_name != NULL)
157 sfree(ctx->topic_name);
158 if (ctx->topic != NULL)
159 rd_kafka_topic_destroy(ctx->topic);
160 if (ctx->conf != NULL)
161 rd_kafka_topic_conf_destroy(ctx->conf);
163 sfree(ctx);
164 } /* }}} void kafka_topic_context_free */
166 static void kafka_config_topic(rd_kafka_conf_t *conf, oconfig_item_t *ci) /* {{{ */
167 {
168 int status;
169 int i;
170 struct kafka_topic_context *tctx;
171 char *key = NULL;
172 char *val;
173 char callback_name[DATA_MAX_NAME_LEN];
174 char errbuf[1024];
175 user_data_t ud;
176 oconfig_item_t *child;
177 rd_kafka_conf_res_t ret;
179 if ((tctx = calloc(1, sizeof (*tctx))) == NULL) {
180 ERROR ("write_kafka plugin: calloc failed.");
181 return;
182 }
184 tctx->escape_char = '.';
185 tctx->store_rates = 1;
186 tctx->format = KAFKA_FORMAT_JSON;
188 #ifdef HAVE_LIBRDKAFKA_LOG_CB
189 rd_kafka_conf_set_log_cb(conf, kafka_log);
190 #endif
191 if ((tctx->kafka = rd_kafka_new(RD_KAFKA_PRODUCER, conf,
192 errbuf, sizeof(errbuf))) == NULL) {
193 sfree(tctx);
194 ERROR("write_kafka plugin: cannot create kafka handle.");
195 return;
196 }
197 #ifdef HAVE_LIBRDKAFKA_LOGGER
198 rd_kafka_conf_set_logger(tctx->kafka, kafka_log);
199 #endif
200 conf = NULL;
202 if ((tctx->conf = rd_kafka_topic_conf_new()) == NULL) {
203 rd_kafka_destroy(tctx->kafka);
204 sfree(tctx);
205 ERROR ("write_kafka plugin: cannot create topic configuration.");
206 return;
207 }
209 if (ci->values_num != 1) {
210 WARNING("kafka topic name needed.");
211 goto errout;
212 }
214 if (ci->values[0].type != OCONFIG_TYPE_STRING) {
215 WARNING("kafka topic needs a string argument.");
216 goto errout;
217 }
219 if ((tctx->topic_name = strdup(ci->values[0].value.string)) == NULL) {
220 ERROR("write_kafka plugin: cannot copy topic name.");
221 goto errout;
222 }
224 for (i = 0; i < ci->children_num; i++) {
225 /*
226 * The code here could be simplified but makes room
227 * for easy adding of new options later on.
228 */
229 child = &ci->children[i];
230 status = 0;
232 if (strcasecmp ("Property", child->key) == 0) {
233 if (child->values_num != 2) {
234 WARNING("kafka properties need both a key and a value.");
235 goto errout;
236 }
237 if (child->values[0].type != OCONFIG_TYPE_STRING ||
238 child->values[1].type != OCONFIG_TYPE_STRING) {
239 WARNING("kafka properties needs string arguments.");
240 goto errout;
241 }
242 key = child->values[0].value.string;
243 val = child->values[0].value.string;
244 ret = rd_kafka_topic_conf_set(tctx->conf,key, val,
245 errbuf, sizeof(errbuf));
246 if (ret != RD_KAFKA_CONF_OK) {
247 WARNING("cannot set kafka topic property %s to %s: %s.",
248 key, val, errbuf);
249 goto errout;
250 }
252 } else if (strcasecmp ("Key", child->key) == 0) {
253 char *tmp_buf = NULL;
254 status = cf_util_get_string(child, &tmp_buf);
255 if (status != 0) {
256 WARNING("write_kafka plugin: invalid key supplied");
257 break;
258 }
260 if (strcasecmp(tmp_buf, "Random") != 0) {
261 tctx->has_key = 1;
262 tctx->key = crc32_buffer((u_char *)tmp_buf, strlen(tmp_buf));
263 }
264 sfree(tmp_buf);
266 } else if (strcasecmp ("Format", child->key) == 0) {
267 status = cf_util_get_string(child, &key);
268 if (status != 0)
269 goto errout;
271 assert(key != NULL);
273 if (strcasecmp(key, "Command") == 0) {
274 tctx->format = KAFKA_FORMAT_COMMAND;
276 } else if (strcasecmp(key, "Graphite") == 0) {
277 tctx->format = KAFKA_FORMAT_GRAPHITE;
279 } else if (strcasecmp(key, "Json") == 0) {
280 tctx->format = KAFKA_FORMAT_JSON;
282 } else {
283 WARNING ("write_kafka plugin: Invalid format string: %s",
284 key);
285 }
287 sfree(key);
289 } else if (strcasecmp ("StoreRates", child->key) == 0) {
290 status = cf_util_get_boolean (child, &tctx->store_rates);
291 (void) cf_util_get_flag (child, &tctx->graphite_flags,
292 GRAPHITE_STORE_RATES);
294 } else if (strcasecmp ("GraphiteSeparateInstances", child->key) == 0) {
295 status = cf_util_get_flag (child, &tctx->graphite_flags,
296 GRAPHITE_SEPARATE_INSTANCES);
298 } else if (strcasecmp ("GraphiteAlwaysAppendDS", child->key) == 0) {
299 status = cf_util_get_flag (child, &tctx->graphite_flags,
300 GRAPHITE_ALWAYS_APPEND_DS);
302 } else if (strcasecmp ("GraphitePrefix", child->key) == 0) {
303 status = cf_util_get_string (child, &tctx->prefix);
304 } else if (strcasecmp ("GraphitePostfix", child->key) == 0) {
305 status = cf_util_get_string (child, &tctx->postfix);
306 } else if (strcasecmp ("GraphiteEscapeChar", child->key) == 0) {
307 char *tmp_buff = NULL;
308 status = cf_util_get_string (child, &tmp_buff);
309 if (strlen (tmp_buff) > 1)
310 WARNING ("write_kafka plugin: The option \"GraphiteEscapeChar\" handles "
311 "only one character. Others will be ignored.");
312 tctx->escape_char = tmp_buff[0];
313 sfree (tmp_buff);
314 } else {
315 WARNING ("write_kafka plugin: Invalid directive: %s.", child->key);
316 }
318 if (status != 0)
319 break;
320 }
322 rd_kafka_topic_conf_set_partitioner_cb(tctx->conf, kafka_partition);
323 rd_kafka_topic_conf_set_opaque(tctx->conf, tctx);
325 if ((tctx->topic = rd_kafka_topic_new(tctx->kafka, tctx->topic_name,
326 tctx->conf)) == NULL) {
327 ERROR("write_kafka plugin: cannot create topic.");
328 goto errout;
329 }
330 tctx->conf = NULL;
332 ssnprintf(callback_name, sizeof(callback_name),
333 "write_kafka/%s", tctx->topic_name);
335 ud.data = tctx;
336 ud.free_func = kafka_topic_context_free;
338 status = plugin_register_write (callback_name, kafka_write, &ud);
339 if (status != 0) {
340 WARNING ("write_kafka plugin: plugin_register_write (\"%s\") "
341 "failed with status %i.",
342 callback_name, status);
343 goto errout;
344 }
345 return;
346 errout:
347 if (conf != NULL)
348 rd_kafka_conf_destroy(conf);
349 if (tctx->kafka != NULL)
350 rd_kafka_destroy(tctx->kafka);
351 if (tctx->topic != NULL)
352 rd_kafka_topic_destroy(tctx->topic);
353 if (tctx->topic_name != NULL)
354 free(tctx->topic_name);
355 if (tctx->conf != NULL)
356 rd_kafka_topic_conf_destroy(tctx->conf);
357 sfree(tctx);
358 } /* }}} int kafka_config_topic */
360 static int kafka_config(oconfig_item_t *ci) /* {{{ */
361 {
362 int i;
363 oconfig_item_t *child;
364 rd_kafka_conf_t *conf;
365 rd_kafka_conf_t *cloned;
366 rd_kafka_conf_res_t ret;
367 char errbuf[1024];
369 if ((conf = rd_kafka_conf_new()) == NULL) {
370 WARNING("cannot allocate kafka configuration.");
371 return -1;
372 }
374 for (i = 0; i < ci->children_num; i++) {
375 child = &ci->children[i];
377 if (strcasecmp("Topic", child->key) == 0) {
378 if ((cloned = rd_kafka_conf_dup(conf)) == NULL) {
379 WARNING("write_kafka plugin: cannot allocate memory for kafka config");
380 goto errout;
381 }
382 kafka_config_topic (cloned, child);
383 } else if (strcasecmp(child->key, "Property") == 0) {
384 char *key = NULL;
385 char *val = NULL;
387 if (child->values_num != 2) {
388 WARNING("kafka properties need both a key and a value.");
389 goto errout;
390 }
391 if (child->values[0].type != OCONFIG_TYPE_STRING ||
392 child->values[1].type != OCONFIG_TYPE_STRING) {
393 WARNING("kafka properties needs string arguments.");
394 goto errout;
395 }
396 if ((key = strdup(child->values[0].value.string)) == NULL) {
397 WARNING("cannot allocate memory for attribute key.");
398 goto errout;
399 }
400 if ((val = strdup(child->values[1].value.string)) == NULL) {
401 WARNING("cannot allocate memory for attribute value.");
402 goto errout;
403 }
404 ret = rd_kafka_conf_set(conf, key, val, errbuf, sizeof(errbuf));
405 if (ret != RD_KAFKA_CONF_OK) {
406 WARNING("cannot set kafka property %s to %s: %s",
407 key, val, errbuf);
408 goto errout;
409 }
410 sfree(key);
411 sfree(val);
412 } else {
413 WARNING ("write_kafka plugin: Ignoring unknown "
414 "configuration option \"%s\" at top level.",
415 child->key);
416 }
417 }
418 if (conf != NULL)
419 rd_kafka_conf_destroy(conf);
420 return (0);
421 errout:
422 if (conf != NULL)
423 rd_kafka_conf_destroy(conf);
424 return -1;
425 } /* }}} int kafka_config */
427 void module_register(void)
428 {
429 plugin_register_complex_config ("write_kafka", kafka_config);
430 }
432 /* vim: set sw=8 sts=8 ts=8 noet : */