1 /**
2 * collectd - src/curl_json.c
3 * Copyright (C) 2009 Doug MacEachern
4 * Copyright (C) 2006-2013 Florian octo Forster
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Doug MacEachern <dougm at hyperic.com>
21 * Florian octo Forster <octo at collectd.org>
22 **/
24 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
28 #include "utils_avltree.h"
29 #include "utils_complain.h"
30 #include "utils_curl_stats.h"
32 #include <sys/types.h>
33 #include <sys/un.h>
35 #include <curl/curl.h>
37 #include <yajl/yajl_parse.h>
38 #if HAVE_YAJL_YAJL_VERSION_H
39 # include <yajl/yajl_version.h>
40 #endif
42 #if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
43 # define HAVE_YAJL_V2 1
44 #endif
46 #define CJ_DEFAULT_HOST "localhost"
47 #define CJ_KEY_MAGIC 0x43484b59UL /* CHKY */
48 #define CJ_IS_KEY(key) ((key)->magic == CJ_KEY_MAGIC)
49 #define CJ_ANY "*"
50 #define COUCH_MIN(x,y) ((x) < (y) ? (x) : (y))
52 struct cj_key_s;
53 typedef struct cj_key_s cj_key_t;
54 struct cj_key_s /* {{{ */
55 {
56 unsigned long magic;
57 char *path;
58 char *type;
59 char *instance;
60 };
61 /* }}} */
63 struct cj_s /* {{{ */
64 {
65 char *instance;
66 char *host;
68 char *sock;
70 char *url;
71 char *user;
72 char *pass;
73 char *credentials;
74 _Bool digest;
75 _Bool verify_peer;
76 _Bool verify_host;
77 char *cacert;
78 struct curl_slist *headers;
79 char *post_body;
80 cdtime_t interval;
81 int timeout;
82 curl_stats_t *stats;
84 CURL *curl;
85 char curl_errbuf[CURL_ERROR_SIZE];
87 yajl_handle yajl;
88 c_avl_tree_t *tree;
89 cj_key_t *key;
90 int depth;
91 struct {
92 union {
93 c_avl_tree_t *tree;
94 cj_key_t *key;
95 };
96 _Bool in_array;
97 int index;
98 char name[DATA_MAX_NAME_LEN];
99 } state[YAJL_MAX_DEPTH];
100 };
101 typedef struct cj_s cj_t; /* }}} */
103 #if HAVE_YAJL_V2
104 typedef size_t yajl_len_t;
105 #else
106 typedef unsigned int yajl_len_t;
107 #endif
109 static int cj_read (user_data_t *ud);
110 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value);
112 static size_t cj_curl_callback (void *buf, /* {{{ */
113 size_t size, size_t nmemb, void *user_data)
114 {
115 cj_t *db;
116 size_t len;
117 yajl_status status;
119 len = size * nmemb;
121 if (len == 0)
122 return (len);
124 db = user_data;
125 if (db == NULL)
126 return (0);
128 status = yajl_parse(db->yajl, (unsigned char *)buf, len);
129 if (status == yajl_status_ok)
130 return (len);
131 #if !HAVE_YAJL_V2
132 else if (status == yajl_status_insufficient_data)
133 return (len);
134 #endif
136 unsigned char *msg = yajl_get_error(db->yajl, /* verbose = */ 1,
137 /* jsonText = */ (unsigned char *) buf, (unsigned int) len);
138 ERROR ("curl_json plugin: yajl_parse failed: %s", msg);
139 yajl_free_error(db->yajl, msg);
140 return (0); /* abort write callback */
141 } /* }}} size_t cj_curl_callback */
143 static int cj_get_type (cj_key_t *key)
144 {
145 const data_set_t *ds;
147 if ((key == NULL) || !CJ_IS_KEY (key))
148 return -EINVAL;
150 ds = plugin_get_ds (key->type);
151 if (ds == NULL)
152 {
153 static char type[DATA_MAX_NAME_LEN] = "!!!invalid!!!";
155 assert (key->type != NULL);
156 if (strcmp (type, key->type) != 0)
157 {
158 ERROR ("curl_json plugin: Unable to look up DS type \"%s\".",
159 key->type);
160 sstrncpy (type, key->type, sizeof (type));
161 }
163 return -1;
164 }
165 else if (ds->ds_num > 1)
166 {
167 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
169 c_complain_once (LOG_WARNING, &complaint,
170 "curl_json plugin: The type \"%s\" has more than one data source. "
171 "This is currently not supported. I will return the type of the "
172 "first data source, but this will likely lead to problems later on.",
173 key->type);
174 }
176 return ds->ds[0].type;
177 }
179 static int cj_cb_map_key (void *ctx, const unsigned char *val,
180 yajl_len_t len);
182 static void cj_cb_inc_array_index (void *ctx, _Bool update_key)
183 {
184 cj_t *db = (cj_t *)ctx;
186 if (!db->state[db->depth].in_array)
187 return;
189 db->state[db->depth].index++;
191 if (update_key)
192 {
193 char name[DATA_MAX_NAME_LEN];
195 ssnprintf (name, sizeof (name), "%d", db->state[db->depth].index - 1);
197 cj_cb_map_key (ctx, (unsigned char *)name, (yajl_len_t) strlen (name));
198 }
199 }
201 /* yajl callbacks */
202 #define CJ_CB_ABORT 0
203 #define CJ_CB_CONTINUE 1
205 static int cj_cb_boolean (void * ctx, int boolVal)
206 {
207 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
208 return (CJ_CB_CONTINUE);
209 }
211 static int cj_cb_null (void * ctx)
212 {
213 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
214 return (CJ_CB_CONTINUE);
215 }
217 static int cj_cb_number (void *ctx,
218 const char *number, yajl_len_t number_len)
219 {
220 char buffer[number_len + 1];
222 cj_t *db = (cj_t *)ctx;
223 cj_key_t *key = db->state[db->depth].key;
224 value_t vt;
225 int type;
226 int status;
228 /* Create a null-terminated version of the string. */
229 memcpy (buffer, number, number_len);
230 buffer[sizeof (buffer) - 1] = 0;
232 if ((key == NULL) || !CJ_IS_KEY (key)) {
233 if (key != NULL && !db->state[db->depth].in_array/*can be inhomogeneous*/) {
234 NOTICE ("curl_json plugin: Found \"%s\", but the configuration expects"
235 " a map.", buffer);
236 return (CJ_CB_CONTINUE);
237 }
239 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
240 key = db->state[db->depth].key;
241 if ((key == NULL) || !CJ_IS_KEY (key)) {
242 return (CJ_CB_CONTINUE);
243 }
244 }
245 else
246 {
247 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
248 }
250 type = cj_get_type (key);
251 status = parse_value (buffer, &vt, type);
252 if (status != 0)
253 {
254 NOTICE ("curl_json plugin: Unable to parse number: \"%s\"", buffer);
255 return (CJ_CB_CONTINUE);
256 }
258 cj_submit (db, key, &vt);
259 return (CJ_CB_CONTINUE);
260 } /* int cj_cb_number */
262 /* Queries the key-tree of the parent context for "in_name" and, if found,
263 * updates the "key" field of the current context. Otherwise, "key" is set to
264 * NULL. */
265 static int cj_cb_map_key (void *ctx,
266 unsigned char const *in_name, yajl_len_t in_name_len)
267 {
268 cj_t *db = (cj_t *)ctx;
269 c_avl_tree_t *tree;
271 tree = db->state[db->depth-1].tree;
273 if (tree != NULL)
274 {
275 cj_key_t *value = NULL;
276 char *name;
277 size_t name_len;
279 /* Create a null-terminated version of the name. */
280 name = db->state[db->depth].name;
281 name_len = COUCH_MIN ((size_t) in_name_len,
282 sizeof (db->state[db->depth].name) - 1);
283 memcpy (name, in_name, name_len);
284 name[name_len] = 0;
286 if (c_avl_get (tree, name, (void *) &value) == 0) {
287 if (CJ_IS_KEY((cj_key_t*)value)) {
288 db->state[db->depth].key = value;
289 }
290 else {
291 db->state[db->depth].tree = (c_avl_tree_t*) value;
292 }
293 }
294 else if (c_avl_get (tree, CJ_ANY, (void *) &value) == 0)
295 if (CJ_IS_KEY((cj_key_t*)value)) {
296 db->state[db->depth].key = value;
297 }
298 else {
299 db->state[db->depth].tree = (c_avl_tree_t*) value;
300 }
301 else
302 db->state[db->depth].key = NULL;
303 }
305 return (CJ_CB_CONTINUE);
306 }
308 static int cj_cb_string (void *ctx, const unsigned char *val,
309 yajl_len_t len)
310 {
311 /* Handle the string as if it was a number. */
312 return (cj_cb_number (ctx, (const char *) val, len));
313 } /* int cj_cb_string */
315 static int cj_cb_start (void *ctx)
316 {
317 cj_t *db = (cj_t *)ctx;
318 if (++db->depth >= YAJL_MAX_DEPTH)
319 {
320 ERROR ("curl_json plugin: %s depth exceeds max, aborting.",
321 db->url ? db->url : db->sock);
322 return (CJ_CB_ABORT);
323 }
324 return (CJ_CB_CONTINUE);
325 }
327 static int cj_cb_end (void *ctx)
328 {
329 cj_t *db = (cj_t *)ctx;
330 db->state[db->depth].tree = NULL;
331 --db->depth;
332 return (CJ_CB_CONTINUE);
333 }
335 static int cj_cb_start_map (void *ctx)
336 {
337 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
338 return cj_cb_start (ctx);
339 }
341 static int cj_cb_end_map (void *ctx)
342 {
343 return cj_cb_end (ctx);
344 }
346 static int cj_cb_start_array (void * ctx)
347 {
348 cj_t *db = (cj_t *)ctx;
349 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
350 if (db->depth+1 < YAJL_MAX_DEPTH) {
351 db->state[db->depth+1].in_array = 1;
352 db->state[db->depth+1].index = 0;
353 }
354 return cj_cb_start (ctx);
355 }
357 static int cj_cb_end_array (void * ctx)
358 {
359 cj_t *db = (cj_t *)ctx;
360 db->state[db->depth].in_array = 0;
361 return cj_cb_end (ctx);
362 }
364 static yajl_callbacks ycallbacks = {
365 cj_cb_null, /* null */
366 cj_cb_boolean, /* boolean */
367 NULL, /* integer */
368 NULL, /* double */
369 cj_cb_number,
370 cj_cb_string,
371 cj_cb_start_map,
372 cj_cb_map_key,
373 cj_cb_end_map,
374 cj_cb_start_array,
375 cj_cb_end_array
376 };
378 /* end yajl callbacks */
380 static void cj_key_free (cj_key_t *key) /* {{{ */
381 {
382 if (key == NULL)
383 return;
385 sfree (key->path);
386 sfree (key->type);
387 sfree (key->instance);
389 sfree (key);
390 } /* }}} void cj_key_free */
392 static void cj_tree_free (c_avl_tree_t *tree) /* {{{ */
393 {
394 char *name;
395 void *value;
397 while (c_avl_pick (tree, (void *) &name, (void *) &value) == 0)
398 {
399 cj_key_t *key = (cj_key_t *)value;
401 if (CJ_IS_KEY(key))
402 cj_key_free (key);
403 else
404 cj_tree_free ((c_avl_tree_t *)value);
406 sfree (name);
407 }
409 c_avl_destroy (tree);
410 } /* }}} void cj_tree_free */
412 static void cj_free (void *arg) /* {{{ */
413 {
414 cj_t *db;
416 DEBUG ("curl_json plugin: cj_free (arg = %p);", arg);
418 db = (cj_t *) arg;
420 if (db == NULL)
421 return;
423 if (db->curl != NULL)
424 curl_easy_cleanup (db->curl);
425 db->curl = NULL;
427 if (db->tree != NULL)
428 cj_tree_free (db->tree);
429 db->tree = NULL;
431 sfree (db->instance);
432 sfree (db->host);
434 sfree (db->sock);
436 sfree (db->url);
437 sfree (db->user);
438 sfree (db->pass);
439 sfree (db->credentials);
440 sfree (db->cacert);
441 sfree (db->post_body);
442 curl_slist_free_all (db->headers);
443 curl_stats_destroy (db->stats);
445 sfree (db);
446 } /* }}} void cj_free */
448 /* Configuration handling functions {{{ */
450 static c_avl_tree_t *cj_avl_create(void)
451 {
452 return c_avl_create ((int (*) (const void *, const void *)) strcmp);
453 }
455 static int cj_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
456 oconfig_item_t *ci)
457 {
458 struct curl_slist *temp = NULL;
459 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
460 {
461 WARNING ("curl_json plugin: `%s' needs exactly one string argument.", name);
462 return (-1);
463 }
465 temp = curl_slist_append(*dest, ci->values[0].value.string);
466 if (temp == NULL)
467 return (-1);
469 *dest = temp;
471 return (0);
472 } /* }}} int cj_config_append_string */
474 static int cj_config_add_key (cj_t *db, /* {{{ */
475 oconfig_item_t *ci)
476 {
477 cj_key_t *key;
478 int status;
480 if ((ci->values_num != 1)
481 || (ci->values[0].type != OCONFIG_TYPE_STRING))
482 {
483 WARNING ("curl_json plugin: The `Key' block "
484 "needs exactly one string argument.");
485 return (-1);
486 }
488 key = calloc (1, sizeof (*key));
489 if (key == NULL)
490 {
491 ERROR ("curl_json plugin: calloc failed.");
492 return (-1);
493 }
494 key->magic = CJ_KEY_MAGIC;
496 if (strcasecmp ("Key", ci->key) == 0)
497 {
498 status = cf_util_get_string (ci, &key->path);
499 if (status != 0)
500 {
501 sfree (key);
502 return (status);
503 }
504 }
505 else
506 {
507 ERROR ("curl_json plugin: cj_config: "
508 "Invalid key: %s", ci->key);
509 cj_key_free (key);
510 return (-1);
511 }
513 status = 0;
514 for (int i = 0; i < ci->children_num; i++)
515 {
516 oconfig_item_t *child = ci->children + i;
518 if (strcasecmp ("Type", child->key) == 0)
519 status = cf_util_get_string (child, &key->type);
520 else if (strcasecmp ("Instance", child->key) == 0)
521 status = cf_util_get_string (child, &key->instance);
522 else
523 {
524 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
525 status = -1;
526 }
528 if (status != 0)
529 break;
530 } /* for (i = 0; i < ci->children_num; i++) */
532 if (status != 0)
533 {
534 cj_key_free (key);
535 return (-1);
536 }
538 if (key->type == NULL)
539 {
540 WARNING ("curl_json plugin: `Type' missing in `Key' block.");
541 cj_key_free (key);
542 return (-1);
543 }
545 /* store path in a tree that will match the json map structure, example:
546 * "httpd/requests/count",
547 * "httpd/requests/current" ->
548 * { "httpd": { "requests": { "count": $key, "current": $key } } }
549 */
550 char *ptr;
551 char *name;
552 c_avl_tree_t *tree;
554 if (db->tree == NULL)
555 db->tree = cj_avl_create();
557 tree = db->tree;
558 ptr = key->path;
559 if (*ptr == '/')
560 ++ptr;
562 name = ptr;
563 while ((ptr = strchr (name, '/')) != NULL)
564 {
565 char ent[PATH_MAX];
566 c_avl_tree_t *value;
567 size_t len;
569 len = ptr - name;
570 if (len == 0)
571 break;
573 len = COUCH_MIN(len, sizeof (ent)-1);
574 sstrncpy (ent, name, len+1);
576 if (c_avl_get (tree, ent, (void *) &value) != 0)
577 {
578 value = cj_avl_create ();
579 c_avl_insert (tree, strdup (ent), value);
580 }
582 tree = value;
583 name = ptr + 1;
584 }
586 if (strlen (name) == 0)
587 {
588 ERROR ("curl_json plugin: invalid key: %s", key->path);
589 cj_key_free (key);
590 return (-1);
591 }
593 c_avl_insert (tree, strdup (name), key);
594 return (status);
595 } /* }}} int cj_config_add_key */
597 static int cj_init_curl (cj_t *db) /* {{{ */
598 {
599 db->curl = curl_easy_init ();
600 if (db->curl == NULL)
601 {
602 ERROR ("curl_json plugin: curl_easy_init failed.");
603 return (-1);
604 }
606 curl_easy_setopt (db->curl, CURLOPT_NOSIGNAL, 1L);
607 curl_easy_setopt (db->curl, CURLOPT_WRITEFUNCTION, cj_curl_callback);
608 curl_easy_setopt (db->curl, CURLOPT_WRITEDATA, db);
609 curl_easy_setopt (db->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
610 curl_easy_setopt (db->curl, CURLOPT_ERRORBUFFER, db->curl_errbuf);
611 curl_easy_setopt (db->curl, CURLOPT_URL, db->url);
612 curl_easy_setopt (db->curl, CURLOPT_FOLLOWLOCATION, 1L);
613 curl_easy_setopt (db->curl, CURLOPT_MAXREDIRS, 50L);
615 if (db->user != NULL)
616 {
617 #ifdef HAVE_CURLOPT_USERNAME
618 curl_easy_setopt (db->curl, CURLOPT_USERNAME, db->user);
619 curl_easy_setopt (db->curl, CURLOPT_PASSWORD,
620 (db->pass == NULL) ? "" : db->pass);
621 #else
622 size_t credentials_size;
624 credentials_size = strlen (db->user) + 2;
625 if (db->pass != NULL)
626 credentials_size += strlen (db->pass);
628 db->credentials = malloc (credentials_size);
629 if (db->credentials == NULL)
630 {
631 ERROR ("curl_json plugin: malloc failed.");
632 return (-1);
633 }
635 ssnprintf (db->credentials, credentials_size, "%s:%s",
636 db->user, (db->pass == NULL) ? "" : db->pass);
637 curl_easy_setopt (db->curl, CURLOPT_USERPWD, db->credentials);
638 #endif
640 if (db->digest)
641 curl_easy_setopt (db->curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
642 }
644 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYPEER, (long) db->verify_peer);
645 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYHOST,
646 db->verify_host ? 2L : 0L);
647 if (db->cacert != NULL)
648 curl_easy_setopt (db->curl, CURLOPT_CAINFO, db->cacert);
649 if (db->headers != NULL)
650 curl_easy_setopt (db->curl, CURLOPT_HTTPHEADER, db->headers);
651 if (db->post_body != NULL)
652 curl_easy_setopt (db->curl, CURLOPT_POSTFIELDS, db->post_body);
654 #ifdef HAVE_CURLOPT_TIMEOUT_MS
655 if (db->timeout >= 0)
656 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS, (long) db->timeout);
657 else if (db->interval > 0)
658 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS, (long) CDTIME_T_TO_MS(db->timeout));
659 else
660 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS, (long) CDTIME_T_TO_MS(plugin_get_interval()));
661 #endif
663 return (0);
664 } /* }}} int cj_init_curl */
666 static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
667 {
668 cj_t *db;
669 int status = 0;
671 if ((ci->values_num != 1)
672 || (ci->values[0].type != OCONFIG_TYPE_STRING))
673 {
674 WARNING ("curl_json plugin: The `URL' block "
675 "needs exactly one string argument.");
676 return (-1);
677 }
679 db = calloc (1, sizeof (*db));
680 if (db == NULL)
681 {
682 ERROR ("curl_json plugin: calloc failed.");
683 return (-1);
684 }
686 db->timeout = -1;
688 if (strcasecmp ("URL", ci->key) == 0)
689 status = cf_util_get_string (ci, &db->url);
690 else if (strcasecmp ("Sock", ci->key) == 0)
691 status = cf_util_get_string (ci, &db->sock);
692 else
693 {
694 ERROR ("curl_json plugin: cj_config: "
695 "Invalid key: %s", ci->key);
696 cj_free (db);
697 return (-1);
698 }
699 if (status != 0)
700 {
701 sfree (db);
702 return (status);
703 }
705 /* Fill the `cj_t' structure.. */
706 for (int i = 0; i < ci->children_num; i++)
707 {
708 oconfig_item_t *child = ci->children + i;
710 if (strcasecmp ("Instance", child->key) == 0)
711 status = cf_util_get_string (child, &db->instance);
712 else if (strcasecmp ("Host", child->key) == 0)
713 status = cf_util_get_string (child, &db->host);
714 else if (db->url && strcasecmp ("User", child->key) == 0)
715 status = cf_util_get_string (child, &db->user);
716 else if (db->url && strcasecmp ("Password", child->key) == 0)
717 status = cf_util_get_string (child, &db->pass);
718 else if (strcasecmp ("Digest", child->key) == 0)
719 status = cf_util_get_boolean (child, &db->digest);
720 else if (db->url && strcasecmp ("VerifyPeer", child->key) == 0)
721 status = cf_util_get_boolean (child, &db->verify_peer);
722 else if (db->url && strcasecmp ("VerifyHost", child->key) == 0)
723 status = cf_util_get_boolean (child, &db->verify_host);
724 else if (db->url && strcasecmp ("CACert", child->key) == 0)
725 status = cf_util_get_string (child, &db->cacert);
726 else if (db->url && strcasecmp ("Header", child->key) == 0)
727 status = cj_config_append_string ("Header", &db->headers, child);
728 else if (db->url && strcasecmp ("Post", child->key) == 0)
729 status = cf_util_get_string (child, &db->post_body);
730 else if (strcasecmp ("Key", child->key) == 0)
731 status = cj_config_add_key (db, child);
732 else if (strcasecmp ("Interval", child->key) == 0)
733 status = cf_util_get_cdtime(child, &db->interval);
734 else if (strcasecmp ("Timeout", child->key) == 0)
735 status = cf_util_get_int (child, &db->timeout);
736 else if (strcasecmp ("Statistics", child->key) == 0)
737 {
738 db->stats = curl_stats_from_config (child);
739 if (db->stats == NULL)
740 status = -1;
741 }
742 else
743 {
744 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
745 status = -1;
746 }
748 if (status != 0)
749 break;
750 }
752 if (status == 0)
753 {
754 if (db->tree == NULL)
755 {
756 WARNING ("curl_json plugin: No (valid) `Key' block within `%s' \"`%s'\".",
757 db->url ? "URL" : "Sock", db->url ? db->url : db->sock);
758 status = -1;
759 }
760 if (status == 0 && db->url)
761 status = cj_init_curl (db);
762 }
764 /* If all went well, register this database for reading */
765 if (status == 0)
766 {
767 char *cb_name;
769 if (db->instance == NULL)
770 db->instance = strdup("default");
772 DEBUG ("curl_json plugin: Registering new read callback: %s",
773 db->instance);
775 cb_name = ssnprintf_alloc ("curl_json-%s-%s",
776 db->instance, db->url ? db->url : db->sock);
778 user_data_t ud = {
779 .data = db,
780 .free_func = cj_free
781 };
783 plugin_register_complex_read (/* group = */ NULL, cb_name, cj_read,
784 /* interval = */ db->interval,
785 &ud);
786 sfree (cb_name);
787 }
788 else
789 {
790 cj_free (db);
791 return (-1);
792 }
794 return (0);
795 }
796 /* }}} int cj_config_add_database */
798 static int cj_config (oconfig_item_t *ci) /* {{{ */
799 {
800 int success;
801 int errors;
802 int status;
804 success = 0;
805 errors = 0;
807 for (int i = 0; i < ci->children_num; i++)
808 {
809 oconfig_item_t *child = ci->children + i;
811 if (strcasecmp ("Sock", child->key) == 0
812 || strcasecmp ("URL", child->key) == 0)
813 {
814 status = cj_config_add_url (child);
815 if (status == 0)
816 success++;
817 else
818 errors++;
819 }
820 else
821 {
822 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
823 errors++;
824 }
825 }
827 if ((success == 0) && (errors > 0))
828 {
829 ERROR ("curl_json plugin: All statements failed.");
830 return (-1);
831 }
833 return (0);
834 } /* }}} int cj_config */
836 /* }}} End of configuration handling functions */
838 static const char *cj_host (cj_t *db) /* {{{ */
839 {
840 if ((db->host == NULL)
841 || (strcmp ("", db->host) == 0)
842 || (strcmp (CJ_DEFAULT_HOST, db->host) == 0))
843 return hostname_g;
844 return db->host;
845 } /* }}} cj_host */
847 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value) /* {{{ */
848 {
849 value_list_t vl = VALUE_LIST_INIT;
851 vl.values = value;
852 vl.values_len = 1;
854 if (key->instance == NULL)
855 {
856 int len = 0;
857 for (int i = 0; i < db->depth; i++)
858 len += ssnprintf(vl.type_instance+len, sizeof(vl.type_instance)-len,
859 i ? "-%s" : "%s", db->state[i+1].name);
860 }
861 else
862 sstrncpy (vl.type_instance, key->instance, sizeof (vl.type_instance));
864 sstrncpy (vl.host, cj_host (db), sizeof (vl.host));
865 sstrncpy (vl.plugin, "curl_json", sizeof (vl.plugin));
866 sstrncpy (vl.plugin_instance, db->instance, sizeof (vl.plugin_instance));
867 sstrncpy (vl.type, key->type, sizeof (vl.type));
869 if (db->interval > 0)
870 vl.interval = db->interval;
872 plugin_dispatch_values (&vl);
873 } /* }}} int cj_submit */
875 static int cj_sock_perform (cj_t *db) /* {{{ */
876 {
877 char errbuf[1024];
878 struct sockaddr_un sa_unix = { 0 };
879 sa_unix.sun_family = AF_UNIX;
880 sstrncpy (sa_unix.sun_path, db->sock, sizeof (sa_unix.sun_path));
882 int fd = socket (AF_UNIX, SOCK_STREAM, 0);
883 if (fd < 0)
884 return (-1);
885 if (connect (fd, (struct sockaddr *)&sa_unix, sizeof(sa_unix)) < 0)
886 {
887 ERROR ("curl_json plugin: connect(%s) failed: %s",
888 (db->sock != NULL) ? db->sock : "<null>",
889 sstrerror(errno, errbuf, sizeof (errbuf)));
890 close (fd);
891 return (-1);
892 }
894 ssize_t red;
895 do {
896 unsigned char buffer[4096];
897 red = read (fd, buffer, sizeof(buffer));
898 if (red < 0) {
899 ERROR ("curl_json plugin: read(%s) failed: %s",
900 (db->sock != NULL) ? db->sock : "<null>",
901 sstrerror(errno, errbuf, sizeof (errbuf)));
902 close (fd);
903 return (-1);
904 }
905 if (!cj_curl_callback (buffer, red, 1, db))
906 break;
907 } while (red > 0);
908 close (fd);
909 return (0);
910 } /* }}} int cj_sock_perform */
913 static int cj_curl_perform(cj_t *db) /* {{{ */
914 {
915 int status;
916 long rc;
917 char *url;
918 url = db->url;
920 status = curl_easy_perform (db->curl);
921 if (status != CURLE_OK)
922 {
923 ERROR ("curl_json plugin: curl_easy_perform failed with status %i: %s (%s)",
924 status, db->curl_errbuf, url);
925 return (-1);
926 }
927 if (db->stats != NULL)
928 curl_stats_dispatch (db->stats, db->curl, cj_host (db), "curl_json", db->instance);
930 curl_easy_getinfo(db->curl, CURLINFO_EFFECTIVE_URL, &url);
931 curl_easy_getinfo(db->curl, CURLINFO_RESPONSE_CODE, &rc);
933 /* The response code is zero if a non-HTTP transport was used. */
934 if ((rc != 0) && (rc != 200))
935 {
936 ERROR ("curl_json plugin: curl_easy_perform failed with "
937 "response code %ld (%s)", rc, url);
938 return (-1);
939 }
940 return (0);
941 } /* }}} int cj_curl_perform */
943 static int cj_perform (cj_t *db) /* {{{ */
944 {
945 int status;
946 yajl_handle yprev = db->yajl;
948 db->yajl = yajl_alloc (&ycallbacks,
949 #if HAVE_YAJL_V2
950 /* alloc funcs = */ NULL,
951 #else
952 /* alloc funcs = */ NULL, NULL,
953 #endif
954 /* context = */ (void *)db);
955 if (db->yajl == NULL)
956 {
957 ERROR ("curl_json plugin: yajl_alloc failed.");
958 db->yajl = yprev;
959 return (-1);
960 }
962 if (db->url)
963 status = cj_curl_perform (db);
964 else
965 status = cj_sock_perform (db);
966 if (status < 0)
967 {
968 yajl_free (db->yajl);
969 db->yajl = yprev;
970 return (-1);
971 }
973 #if HAVE_YAJL_V2
974 status = yajl_complete_parse(db->yajl);
975 #else
976 status = yajl_parse_complete(db->yajl);
977 #endif
978 if (status != yajl_status_ok)
979 {
980 unsigned char *errmsg;
982 errmsg = yajl_get_error (db->yajl, /* verbose = */ 0,
983 /* jsonText = */ NULL, /* jsonTextLen = */ 0);
984 ERROR ("curl_json plugin: yajl_parse_complete failed: %s",
985 (char *) errmsg);
986 yajl_free_error (db->yajl, errmsg);
987 yajl_free (db->yajl);
988 db->yajl = yprev;
989 return (-1);
990 }
992 yajl_free (db->yajl);
993 db->yajl = yprev;
994 return (0);
995 } /* }}} int cj_perform */
997 static int cj_read (user_data_t *ud) /* {{{ */
998 {
999 cj_t *db;
1001 if ((ud == NULL) || (ud->data == NULL))
1002 {
1003 ERROR ("curl_json plugin: cj_read: Invalid user data.");
1004 return (-1);
1005 }
1007 db = (cj_t *) ud->data;
1009 db->depth = 0;
1010 memset (&db->state, 0, sizeof(db->state));
1011 db->state[db->depth].tree = db->tree;
1012 db->key = NULL;
1014 return cj_perform (db);
1015 } /* }}} int cj_read */
1017 static int cj_init (void) /* {{{ */
1018 {
1019 /* Call this while collectd is still single-threaded to avoid
1020 * initialization issues in libgcrypt. */
1021 curl_global_init (CURL_GLOBAL_SSL);
1022 return (0);
1023 } /* }}} int cj_init */
1025 void module_register (void)
1026 {
1027 plugin_register_complex_config ("curl_json", cj_config);
1028 plugin_register_init ("curl_json", cj_init);
1029 } /* void module_register */
1031 /* vim: set sw=2 sts=2 et fdm=marker : */