2 * collectd - src/write_http.c
3 * Copyright (C) 2009 Paul Sadauskas
4 * Copyright (C) 2009 Doug MacEachern
5 * Copyright (C) 2007-2009 Florian octo Forster
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 * Florian octo Forster <octo at verplant.org>
22 * Doug MacEachern <dougm@hyperic.com>
23 * Paul Sadauskas <psadauskas@gmail.com>
29 #include "utils_cache.h"
30 #include "utils_parse_option.h"
31 #include "utils_format_json.h"
37 #include <curl/curl.h>
54 #define WH_FORMAT_COMMAND 0
55 #define WH_FORMAT_JSON 1
59 char curl_errbuf[CURL_ERROR_SIZE];
61 char send_buffer[4096];
62 size_t send_buffer_free;
63 size_t send_buffer_fill;
64 cdtime_t send_buffer_init_time;
66 pthread_mutex_t send_lock;
68 typedef struct wh_callback_s wh_callback_t;
70 static void wh_reset_buffer (wh_callback_t *cb) /* {{{ */
72 memset (cb->send_buffer, 0, sizeof (cb->send_buffer));
73 cb->send_buffer_free = sizeof (cb->send_buffer);
74 cb->send_buffer_fill = 0;
75 cb->send_buffer_init_time = cdtime ();
77 if (cb->format == WH_FORMAT_JSON)
79 format_json_initialize (cb->send_buffer,
80 &cb->send_buffer_fill,
81 &cb->send_buffer_free);
83 } /* }}} wh_reset_buffer */
85 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
89 curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
90 status = curl_easy_perform (cb->curl);
93 ERROR ("write_http plugin: curl_easy_perform failed with "
95 status, cb->curl_errbuf);
98 } /* }}} wh_send_buffer */
100 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
102 struct curl_slist *headers;
104 if (cb->curl != NULL)
107 cb->curl = curl_easy_init ();
108 if (cb->curl == NULL)
110 ERROR ("curl plugin: curl_easy_init failed.");
114 curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
117 headers = curl_slist_append (headers, "Accept: */*");
118 if (cb->format == WH_FORMAT_JSON)
119 headers = curl_slist_append (headers, "Content-Type: application/json");
121 headers = curl_slist_append (headers, "Content-Type: text/plain");
122 headers = curl_slist_append (headers, "Expect:");
123 curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, headers);
125 curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
126 curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
128 if (cb->user != NULL)
130 size_t credentials_size;
132 credentials_size = strlen (cb->user) + 2;
133 if (cb->pass != NULL)
134 credentials_size += strlen (cb->pass);
136 cb->credentials = (char *) malloc (credentials_size);
137 if (cb->credentials == NULL)
139 ERROR ("curl plugin: malloc failed.");
143 ssnprintf (cb->credentials, credentials_size, "%s:%s",
144 cb->user, (cb->pass == NULL) ? "" : cb->pass);
145 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
146 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
149 curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, cb->verify_peer);
150 curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
151 cb->verify_host ? 2 : 0);
152 if (cb->cacert != NULL)
153 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
155 wh_reset_buffer (cb);
158 } /* }}} int wh_callback_init */
160 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
164 DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
165 "send_buffer_fill = %zu;",
166 CDTIME_T_TO_DOUBLE (timeout),
167 cb->send_buffer_fill);
169 /* timeout == 0 => flush unconditionally */
175 if ((cb->send_buffer_init_time + timeout) > now)
179 if (cb->format == WH_FORMAT_COMMAND)
181 if (cb->send_buffer_fill <= 0)
183 cb->send_buffer_init_time = cdtime ();
187 status = wh_send_buffer (cb);
188 wh_reset_buffer (cb);
190 else if (cb->format == WH_FORMAT_JSON)
192 if (cb->send_buffer_fill <= 2)
194 cb->send_buffer_init_time = cdtime ();
198 status = format_json_finalize (cb->send_buffer,
199 &cb->send_buffer_fill,
200 &cb->send_buffer_free);
203 ERROR ("write_http: wh_flush_nolock: "
204 "format_json_finalize failed.");
205 wh_reset_buffer (cb);
209 status = wh_send_buffer (cb);
210 wh_reset_buffer (cb);
214 ERROR ("write_http: wh_flush_nolock: "
215 "Unknown format: %i",
221 } /* }}} wh_flush_nolock */
223 static int wh_flush (cdtime_t timeout, /* {{{ */
224 const char *identifier __attribute__((unused)),
225 user_data_t *user_data)
230 if (user_data == NULL)
233 cb = user_data->data;
235 pthread_mutex_lock (&cb->send_lock);
237 if (cb->curl == NULL)
239 status = wh_callback_init (cb);
242 ERROR ("write_http plugin: wh_callback_init failed.");
243 pthread_mutex_unlock (&cb->send_lock);
248 status = wh_flush_nolock (timeout, cb);
249 pthread_mutex_unlock (&cb->send_lock);
252 } /* }}} int wh_flush */
254 static void wh_callback_free (void *data) /* {{{ */
263 wh_flush_nolock (/* timeout = */ 0, cb);
265 curl_easy_cleanup (cb->curl);
266 sfree (cb->location);
269 sfree (cb->credentials);
273 } /* }}} void wh_callback_free */
275 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
278 char key[10*DATA_MAX_NAME_LEN];
285 if (0 != strcmp (ds->type, vl->type)) {
286 ERROR ("write_http plugin: DS type does not match "
291 /* Copy the identifier to `key' and escape it. */
292 status = FORMAT_VL (key, sizeof (key), vl);
294 ERROR ("write_http plugin: error with format_name");
297 escape_string (key, sizeof (key));
299 /* Convert the values to an ASCII representation and put that into
301 status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
303 ERROR ("write_http plugin: error with "
304 "wh_value_list_to_string");
308 command_len = (size_t) ssnprintf (command, sizeof (command),
309 "PUTVAL %s interval=%.3f %s\r\n",
311 CDTIME_T_TO_DOUBLE (vl->interval),
313 if (command_len >= sizeof (command)) {
314 ERROR ("write_http plugin: Command buffer too small: "
315 "Need %zu bytes.", command_len + 1);
319 pthread_mutex_lock (&cb->send_lock);
321 if (cb->curl == NULL)
323 status = wh_callback_init (cb);
326 ERROR ("write_http plugin: wh_callback_init failed.");
327 pthread_mutex_unlock (&cb->send_lock);
332 if (command_len >= cb->send_buffer_free)
334 status = wh_flush_nolock (/* timeout = */ 0, cb);
337 pthread_mutex_unlock (&cb->send_lock);
341 assert (command_len < cb->send_buffer_free);
343 /* `command_len + 1' because `command_len' does not include the
344 * trailing null byte. Neither does `send_buffer_fill'. */
345 memcpy (cb->send_buffer + cb->send_buffer_fill,
346 command, command_len + 1);
347 cb->send_buffer_fill += command_len;
348 cb->send_buffer_free -= command_len;
350 DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
352 cb->send_buffer_fill, sizeof (cb->send_buffer),
353 100.0 * ((double) cb->send_buffer_fill) / ((double) sizeof (cb->send_buffer)),
356 /* Check if we have enough space for this command. */
357 pthread_mutex_unlock (&cb->send_lock);
360 } /* }}} int wh_write_command */
362 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
367 pthread_mutex_lock (&cb->send_lock);
369 if (cb->curl == NULL)
371 status = wh_callback_init (cb);
374 ERROR ("write_http plugin: wh_callback_init failed.");
375 pthread_mutex_unlock (&cb->send_lock);
380 status = format_json_value_list (cb->send_buffer,
381 &cb->send_buffer_fill,
382 &cb->send_buffer_free,
383 ds, vl, cb->store_rates);
384 if (status == (-ENOMEM))
386 status = wh_flush_nolock (/* timeout = */ 0, cb);
389 wh_reset_buffer (cb);
390 pthread_mutex_unlock (&cb->send_lock);
394 status = format_json_value_list (cb->send_buffer,
395 &cb->send_buffer_fill,
396 &cb->send_buffer_free,
397 ds, vl, cb->store_rates);
401 pthread_mutex_unlock (&cb->send_lock);
405 DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
407 cb->send_buffer_fill, sizeof (cb->send_buffer),
408 100.0 * ((double) cb->send_buffer_fill) / ((double) sizeof (cb->send_buffer)));
410 /* Check if we have enough space for this command. */
411 pthread_mutex_unlock (&cb->send_lock);
414 } /* }}} int wh_write_json */
416 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
417 user_data_t *user_data)
422 if (user_data == NULL)
425 cb = user_data->data;
427 if (cb->format == WH_FORMAT_JSON)
428 status = wh_write_json (ds, vl, cb);
430 status = wh_write_command (ds, vl, cb);
433 } /* }}} int wh_write */
435 static int config_set_string (char **ret_string, /* {{{ */
440 if ((ci->values_num != 1)
441 || (ci->values[0].type != OCONFIG_TYPE_STRING))
443 WARNING ("write_http plugin: The `%s' config option "
444 "needs exactly one string argument.", ci->key);
448 string = strdup (ci->values[0].value.string);
451 ERROR ("write_http plugin: strdup failed.");
455 if (*ret_string != NULL)
457 *ret_string = string;
460 } /* }}} int config_set_string */
462 static int config_set_boolean (int *dest, oconfig_item_t *ci) /* {{{ */
464 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
466 WARNING ("write_http plugin: The `%s' config option "
467 "needs exactly one boolean argument.", ci->key);
471 *dest = ci->values[0].value.boolean ? 1 : 0;
474 } /* }}} int config_set_boolean */
476 static int config_set_format (wh_callback_t *cb, /* {{{ */
481 if ((ci->values_num != 1)
482 || (ci->values[0].type != OCONFIG_TYPE_STRING))
484 WARNING ("write_http plugin: The `%s' config option "
485 "needs exactly one string argument.", ci->key);
489 string = ci->values[0].value.string;
490 if (strcasecmp ("Command", string) == 0)
491 cb->format = WH_FORMAT_COMMAND;
492 else if (strcasecmp ("JSON", string) == 0)
493 cb->format = WH_FORMAT_JSON;
496 ERROR ("write_http plugin: Invalid format string: %s",
502 } /* }}} int config_set_string */
504 static int wh_config_url (oconfig_item_t *ci) /* {{{ */
507 user_data_t user_data;
510 cb = malloc (sizeof (*cb));
513 ERROR ("write_http plugin: malloc failed.");
516 memset (cb, 0, sizeof (*cb));
520 cb->credentials = NULL;
524 cb->format = WH_FORMAT_COMMAND;
527 pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
529 config_set_string (&cb->location, ci);
530 if (cb->location == NULL)
533 for (i = 0; i < ci->children_num; i++)
535 oconfig_item_t *child = ci->children + i;
537 if (strcasecmp ("User", child->key) == 0)
538 config_set_string (&cb->user, child);
539 else if (strcasecmp ("Password", child->key) == 0)
540 config_set_string (&cb->pass, child);
541 else if (strcasecmp ("VerifyPeer", child->key) == 0)
542 config_set_boolean (&cb->verify_peer, child);
543 else if (strcasecmp ("VerifyHost", child->key) == 0)
544 config_set_boolean (&cb->verify_host, child);
545 else if (strcasecmp ("CACert", child->key) == 0)
546 config_set_string (&cb->cacert, child);
547 else if (strcasecmp ("Format", child->key) == 0)
548 config_set_format (cb, child);
549 else if (strcasecmp ("StoreRates", child->key) == 0)
550 config_set_boolean (&cb->store_rates, child);
553 ERROR ("write_http plugin: Invalid configuration "
554 "option: %s.", child->key);
558 DEBUG ("write_http: Registering write callback with URL %s",
561 memset (&user_data, 0, sizeof (user_data));
563 user_data.free_func = NULL;
564 plugin_register_flush ("write_http", wh_flush, &user_data);
566 user_data.free_func = wh_callback_free;
567 plugin_register_write ("write_http", wh_write, &user_data);
570 } /* }}} int wh_config_url */
572 static int wh_config (oconfig_item_t *ci) /* {{{ */
576 for (i = 0; i < ci->children_num; i++)
578 oconfig_item_t *child = ci->children + i;
580 if (strcasecmp ("URL", child->key) == 0)
581 wh_config_url (child);
584 ERROR ("write_http plugin: Invalid configuration "
585 "option: %s.", child->key);
590 } /* }}} int wh_config */
592 void module_register (void) /* {{{ */
594 plugin_register_complex_config ("write_http", wh_config);
595 } /* }}} void module_register */
597 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */