src/write_riemann.c

   1 /**
   2  * collectd - src/write_riemann.c
   3  * Copyright (C) 2012,2013  Pierre-Yves Ritschard
   4  * Copyright (C) 2013       Florian octo Forster
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *   Pierre-Yves Ritschard <pyr at spootnik.org>
  26  *   Florian octo Forster <octo at collectd.org>
  27  */
  28
  29 #include "collectd.h"
  30 #include "plugin.h"
  31 #include "common.h"
  32 #include "configfile.h"
  33 #include "utils_cache.h"
  34 #include "riemann.pb-c.h"
  35
  36 #include <sys/socket.h>
  37 #include <arpa/inet.h>
  38 #include <errno.h>
  39 #include <netdb.h>
  40 #include <inttypes.h>
  41 #include <pthread.h>
  42
  43 #define RIEMANN_HOST            "localhost"
  44 #define RIEMANN_PORT            "5555"
  45 #define RIEMANN_TTL_FACTOR      2.0
  46
  47 int write_riemann_threshold_check(const data_set_t *, const value_list_t *, int *);
  48
  49 struct riemann_host {
  50         char                    *name;
  51         char                    *event_service_prefix;
  52 #define F_CONNECT                0x01
  53         uint8_t                  flags;
  54         pthread_mutex_t          lock;
  55         _Bool                    notifications;
  56         _Bool                    check_thresholds;
  57         _Bool                    store_rates;
  58         _Bool                    always_append_ds;
  59         char                    *node;
  60         char                    *service;
  61         _Bool                    use_tcp;
  62         int                      s;
  63         double                   ttl_factor;
  64
  65         int                      reference_count;
  66 };
  67
  68 static char     **riemann_tags;
  69 static size_t     riemann_tags_num;
  70 static char     **riemann_attrs;
  71 static size_t     riemann_attrs_num;
  72
  73 static void riemann_event_protobuf_free (Event *event) /* {{{ */
  74 {
  75         size_t i;
  76
  77         if (event == NULL)
  78                 return;
  79
  80         sfree (event->state);
  81         sfree (event->service);
  82         sfree (event->host);
  83         sfree (event->description);
  84
  85         strarray_free (event->tags, event->n_tags);
  86         event->tags = NULL;
  87         event->n_tags = 0;
  88
  89         for (i = 0; i < event->n_attributes; i++)
  90         {
  91                 sfree (event->attributes[i]->key);
  92                 sfree (event->attributes[i]->value);
  93                 sfree (event->attributes[i]);
  94         }
  95         sfree (event->attributes);
  96         event->n_attributes = 0;
  97
  98         sfree (event);
  99 } /* }}} void riemann_event_protobuf_free */
 100
 101 static void riemann_msg_protobuf_free(Msg *msg) /* {{{ */
 102 {
 103         size_t i;
 104
 105         if (msg == NULL)
 106                 return;
 107
 108         for (i = 0; i < msg->n_events; i++)
 109         {
 110                 riemann_event_protobuf_free (msg->events[i]);
 111                 msg->events[i] = NULL;
 112         }
 113
 114         sfree (msg->events);
 115         msg->n_events = 0;
 116
 117         sfree (msg);
 118 } /* }}} void riemann_msg_protobuf_free */
 119
 120 /* host->lock must be held when calling this function. */
 121 static int riemann_connect(struct riemann_host *host) /* {{{ */
 122 {
 123         int                      e;
 124         struct addrinfo         *ai, *res, hints;
 125         char const              *node;
 126         char const              *service;
 127
 128         if (host->flags & F_CONNECT)
 129                 return 0;
 130
 131         memset(&hints, 0, sizeof(hints));
 132         memset(&service, 0, sizeof(service));
 133         hints.ai_family = AF_UNSPEC;
 134         hints.ai_socktype = host->use_tcp ? SOCK_STREAM : SOCK_DGRAM;
 135 #ifdef AI_ADDRCONFIG
 136         hints.ai_flags |= AI_ADDRCONFIG;
 137 #endif
 138
 139         node = (host->node != NULL) ? host->node : RIEMANN_HOST;
 140         service = (host->service != NULL) ? host->service : RIEMANN_PORT;
 141
 142         if ((e = getaddrinfo(node, service, &hints, &res)) != 0) {
 143                 ERROR ("write_riemann plugin: Unable to resolve host \"%s\": %s",
 144                         node, gai_strerror(e));
 145                 return -1;
 146         }
 147
 148         host->s = -1;
 149         for (ai = res; ai != NULL; ai = ai->ai_next) {
 150                 if ((host->s = socket(ai->ai_family,
 151                                       ai->ai_socktype,
 152                                       ai->ai_protocol)) == -1) {
 153                         continue;
 154                 }
 155
 156                 if (connect(host->s, ai->ai_addr, ai->ai_addrlen) != 0) {
 157                         close(host->s);
 158                         host->s = -1;
 159                         continue;
 160                 }
 161
 162                 host->flags |= F_CONNECT;
 163                 DEBUG("write_riemann plugin: got a successful connection for: %s:%s",
 164                                 node, service);
 165                 break;
 166         }
 167
 168         freeaddrinfo(res);
 169
 170         if (host->s < 0) {
 171                 WARNING("write_riemann plugin: Unable to connect to Riemann at %s:%s",
 172                                 node, service);
 173                 return -1;
 174         }
 175         return 0;
 176 } /* }}} int riemann_connect */
 177
 178 /* host->lock must be held when calling this function. */
 179 static int riemann_disconnect (struct riemann_host *host) /* {{{ */
 180 {
 181         if ((host->flags & F_CONNECT) == 0)
 182                 return (0);
 183
 184         close (host->s);
 185         host->s = -1;
 186         host->flags &= ~F_CONNECT;
 187
 188         return (0);
 189 } /* }}} int riemann_disconnect */
 190
 191 static int riemann_send_msg (struct riemann_host *host, const Msg *msg) /* {{{ */
 192 {
 193         int status = 0;
 194         u_char *buffer = NULL;
 195         size_t  buffer_len;
 196
 197         status = riemann_connect (host);
 198         if (status != 0)
 199                 return status;
 200
 201         buffer_len = msg__get_packed_size(msg);
 202
 203         if (host->use_tcp)
 204                 buffer_len += 4;
 205
 206         buffer = malloc (buffer_len);
 207         if (buffer == NULL) {
 208                 ERROR ("write_riemann plugin: malloc failed.");
 209                 return ENOMEM;
 210         }
 211         memset (buffer, 0, buffer_len);
 212
 213         if (host->use_tcp)
 214         {
 215                 uint32_t length = htonl ((uint32_t) (buffer_len - 4));
 216                 memcpy (buffer, &length, 4);
 217                 msg__pack(msg, buffer + 4);
 218         }
 219         else
 220         {
 221                 msg__pack(msg, buffer);
 222         }
 223
 224         status = (int) swrite (host->s, buffer, buffer_len);
 225         if (status != 0)
 226         {
 227                 char errbuf[1024];
 228                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s failed: %s",
 229                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 230                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 231                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 232                 sfree (buffer);
 233                 return -1;
 234         }
 235
 236         sfree (buffer);
 237         return 0;
 238 } /* }}} int riemann_send_msg */
 239
 240 static int riemann_recv_ack(struct riemann_host *host) /* {{{ */
 241 {
 242         int status = 0;
 243         Msg *msg = NULL;
 244         uint32_t header;
 245
 246         status = (int) sread (host->s, &header, 4);
 247
 248         if (status != 0)
 249                 return -1;
 250
 251         size_t size = ntohl(header);
 252
 253         // Buffer on the stack since acknowledges are typically small.
 254         u_char buffer[size];
 255         memset (buffer, 0, size);
 256
 257         status = (int) sread (host->s, buffer, size);
 258
 259         if (status != 0)
 260                 return status;
 261
 262         msg = msg__unpack (NULL, size, buffer);
 263
 264         if (msg == NULL)
 265                 return -1;
 266
 267         if (!msg->ok)
 268         {
 269                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s acknowledgement message reported error: %s",
 270                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 271                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 272                                 msg->error);
 273
 274                 msg__free_unpacked(msg, NULL);
 275                 return -1;
 276         }
 277
 278         msg__free_unpacked (msg, NULL);
 279         return 0;
 280 } /* }}} int riemann_recv_ack */
 281
 282 /**
 283  * Function to send messages (Msg) to riemann.
 284  *
 285  * Acquires the host lock, disconnects on errors.
 286  */
 287 static int riemann_send(struct riemann_host *host, Msg const *msg) /* {{{ */
 288 {
 289         int status = 0;
 290         pthread_mutex_lock (&host->lock);
 291
 292         status = riemann_send_msg(host, msg);
 293         if (status != 0) {
 294                 riemann_disconnect (host);
 295                 pthread_mutex_unlock (&host->lock);
 296                 return status;
 297         }
 298
 299         /*
 300          * For TCP we need to receive message acknowledgemenent.
 301          */
 302         if (host->use_tcp)
 303         {
 304                 status = riemann_recv_ack(host);
 305
 306                 if (status != 0)
 307                 {
 308                         riemann_disconnect (host);
 309                         pthread_mutex_unlock (&host->lock);
 310                         return status;
 311                 }
 312         }
 313
 314         pthread_mutex_unlock (&host->lock);
 315         return 0;
 316 } /* }}} int riemann_send */
 317
 318 static int riemann_event_add_tag (Event *event, char const *tag) /* {{{ */
 319 {
 320         return (strarray_add (&event->tags, &event->n_tags, tag));
 321 } /* }}} int riemann_event_add_tag */
 322
 323 static int riemann_event_add_attribute(Event *event, /* {{{ */
 324                 char const *key, char const *value)
 325 {
 326         Attribute **new_attributes;
 327         Attribute *a;
 328
 329         new_attributes = realloc (event->attributes,
 330                         sizeof (*event->attributes) * (event->n_attributes + 1));
 331         if (new_attributes == NULL)
 332         {
 333                 ERROR ("write_riemann plugin: realloc failed.");
 334                 return (ENOMEM);
 335         }
 336         event->attributes = new_attributes;
 337
 338         a = malloc (sizeof (*a));
 339         if (a == NULL)
 340         {
 341                 ERROR ("write_riemann plugin: malloc failed.");
 342                 return (ENOMEM);
 343         }
 344         attribute__init (a);
 345
 346         a->key = strdup (key);
 347         if (value != NULL)
 348                 a->value = strdup (value);
 349
 350         event->attributes[event->n_attributes] = a;
 351         event->n_attributes++;
 352
 353         return (0);
 354 } /* }}} int riemann_event_add_attribute */
 355
 356 static Msg *riemann_notification_to_protobuf(struct riemann_host *host, /* {{{ */
 357                 notification_t const *n)
 358 {
 359         Msg *msg;
 360         Event *event;
 361         char service_buffer[6 * DATA_MAX_NAME_LEN];
 362         char const *severity;
 363         notification_meta_t *meta;
 364         int i;
 365
 366         msg = malloc (sizeof (*msg));
 367         if (msg == NULL)
 368         {
 369                 ERROR ("write_riemann plugin: malloc failed.");
 370                 return (NULL);
 371         }
 372         memset (msg, 0, sizeof (*msg));
 373         msg__init (msg);
 374
 375         msg->events = malloc (sizeof (*msg->events));
 376         if (msg->events == NULL)
 377         {
 378                 ERROR ("write_riemann plugin: malloc failed.");
 379                 sfree (msg);
 380                 return (NULL);
 381         }
 382
 383         event = malloc (sizeof (*event));
 384         if (event == NULL)
 385         {
 386                 ERROR ("write_riemann plugin: malloc failed.");
 387                 sfree (msg->events);
 388                 sfree (msg);
 389                 return (NULL);
 390         }
 391         memset (event, 0, sizeof (*event));
 392         event__init (event);
 393
 394         msg->events[0] = event;
 395         msg->n_events = 1;
 396
 397         event->host = strdup (n->host);
 398         event->time = CDTIME_T_TO_TIME_T (n->time);
 399         event->has_time = 1;
 400
 401         switch (n->severity)
 402         {
 403                 case NOTIF_OKAY:        severity = "ok"; break;
 404                 case NOTIF_WARNING:     severity = "warning"; break;
 405                 case NOTIF_FAILURE:     severity = "critical"; break;
 406                 default:                severity = "unknown";
 407         }
 408         event->state = strdup (severity);
 409
 410         riemann_event_add_tag (event, "notification");
 411         if (n->host[0] != 0)
 412                 riemann_event_add_attribute (event, "host", n->host);
 413         if (n->plugin[0] != 0)
 414                 riemann_event_add_attribute (event, "plugin", n->plugin);
 415         if (n->plugin_instance[0] != 0)
 416                 riemann_event_add_attribute (event, "plugin_instance",
 417                                 n->plugin_instance);
 418
 419         if (n->type[0] != 0)
 420                 riemann_event_add_attribute (event, "type", n->type);
 421         if (n->type_instance[0] != 0)
 422                 riemann_event_add_attribute (event, "type_instance",
 423                                 n->type_instance);
 424
 425         for (i = 0; i < riemann_attrs_num; i += 2)
 426                 riemann_event_add_attribute(event,
 427                                             riemann_attrs[i],
 428                                             riemann_attrs[i +1]);
 429
 430         for (i = 0; i < riemann_tags_num; i++)
 431                 riemann_event_add_tag (event, riemann_tags[i]);
 432
 433         format_name (service_buffer, sizeof (service_buffer),
 434                         /* host = */ "", n->plugin, n->plugin_instance,
 435                         n->type, n->type_instance);
 436         event->service = strdup (&service_buffer[1]);
 437
 438         if (n->message[0] != 0)
 439                 riemann_event_add_attribute (event, "description", n->message);
 440
 441         /* Pull in values from threshold and add extra attributes */
 442         for (meta = n->meta; meta != NULL; meta = meta->next)
 443         {
 444                 if (strcasecmp ("CurrentValue", meta->name) == 0 && meta->type == NM_TYPE_DOUBLE)
 445                 {
 446                         event->metric_d = meta->nm_value.nm_double;
 447                         event->has_metric_d = 1;
 448                         continue;
 449                 }
 450
 451                 if (meta->type == NM_TYPE_STRING) {
 452                         riemann_event_add_attribute (event, meta->name, meta->nm_value.nm_string);
 453                         continue;
 454                 }
 455         }
 456
 457         DEBUG ("write_riemann plugin: Successfully created protobuf for notification: "
 458                         "host = \"%s\", service = \"%s\", state = \"%s\"",
 459                         event->host, event->service, event->state);
 460         return (msg);
 461 } /* }}} Msg *riemann_notification_to_protobuf */
 462
 463 static Event *riemann_value_to_protobuf(struct riemann_host const *host, /* {{{ */
 464                 data_set_t const *ds,
 465                 value_list_t const *vl, size_t index,
 466                                          gauge_t const *rates,
 467                                          int status)
 468 {
 469         Event *event;
 470         char name_buffer[5 * DATA_MAX_NAME_LEN];
 471         char service_buffer[6 * DATA_MAX_NAME_LEN];
 472         double ttl;
 473         int i;
 474
 475         event = malloc (sizeof (*event));
 476         if (event == NULL)
 477         {
 478                 ERROR ("write_riemann plugin: malloc failed.");
 479                 return (NULL);
 480         }
 481         memset (event, 0, sizeof (*event));
 482         event__init (event);
 483
 484         event->host = strdup (vl->host);
 485         event->time = CDTIME_T_TO_TIME_T (vl->time);
 486         event->has_time = 1;
 487
 488         if (host->check_thresholds) {
 489                 switch (status) {
 490                         case STATE_OKAY:
 491                                 event->state = strdup("ok");
 492                                 break;
 493                         case STATE_ERROR:
 494                                 event->state = strdup("critical");
 495                                 break;
 496                         case STATE_WARNING:
 497                                 event->state = strdup("warning");
 498                                 break;
 499                         case STATE_MISSING:
 500                                 event->state = strdup("unknown");
 501                                 break;
 502                 }
 503         }
 504
 505         ttl = CDTIME_T_TO_DOUBLE (vl->interval) * host->ttl_factor;
 506         event->ttl = (float) ttl;
 507         event->has_ttl = 1;
 508
 509         riemann_event_add_attribute (event, "plugin", vl->plugin);
 510         if (vl->plugin_instance[0] != 0)
 511                 riemann_event_add_attribute (event, "plugin_instance",
 512                                 vl->plugin_instance);
 513
 514         riemann_event_add_attribute (event, "type", vl->type);
 515         if (vl->type_instance[0] != 0)
 516                 riemann_event_add_attribute (event, "type_instance",
 517                                 vl->type_instance);
 518
 519         if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL))
 520         {
 521                 char ds_type[DATA_MAX_NAME_LEN];
 522
 523                 ssnprintf (ds_type, sizeof (ds_type), "%s:rate",
 524                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 525                 riemann_event_add_attribute (event, "ds_type", ds_type);
 526         }
 527         else
 528         {
 529                 riemann_event_add_attribute (event, "ds_type",
 530                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 531         }
 532         riemann_event_add_attribute (event, "ds_name", ds->ds[index].name);
 533         {
 534                 char ds_index[DATA_MAX_NAME_LEN];
 535
 536                 ssnprintf (ds_index, sizeof (ds_index), "%zu", index);
 537                 riemann_event_add_attribute (event, "ds_index", ds_index);
 538         }
 539
 540         for (i = 0; i < riemann_attrs_num; i += 2)
 541                 riemann_event_add_attribute(event,
 542                                             riemann_attrs[i],
 543                                             riemann_attrs[i +1]);
 544
 545         for (i = 0; i < riemann_tags_num; i++)
 546                 riemann_event_add_tag (event, riemann_tags[i]);
 547
 548         if (ds->ds[index].type == DS_TYPE_GAUGE)
 549         {
 550                 event->has_metric_d = 1;
 551                 event->metric_d = (double) vl->values[index].gauge;
 552         }
 553         else if (rates != NULL)
 554         {
 555                 event->has_metric_d = 1;
 556                 event->metric_d = (double) rates[index];
 557         }
 558         else
 559         {
 560                 event->has_metric_sint64 = 1;
 561                 if (ds->ds[index].type == DS_TYPE_DERIVE)
 562                         event->metric_sint64 = (int64_t) vl->values[index].derive;
 563                 else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
 564                         event->metric_sint64 = (int64_t) vl->values[index].absolute;
 565                 else
 566                         event->metric_sint64 = (int64_t) vl->values[index].counter;
 567         }
 568
 569         format_name (name_buffer, sizeof (name_buffer),
 570                         /* host = */ "", vl->plugin, vl->plugin_instance,
 571                         vl->type, vl->type_instance);
 572         if (host->always_append_ds || (ds->ds_num > 1))
 573         {
 574                 if (host->event_service_prefix == NULL)
 575                         ssnprintf (service_buffer, sizeof (service_buffer), "%s/%s",
 576                                         &name_buffer[1], ds->ds[index].name);
 577                 else
 578                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s/%s",
 579                                         host->event_service_prefix, &name_buffer[1], ds->ds[index].name);
 580         }
 581         else
 582         {
 583                 if (host->event_service_prefix == NULL)
 584                         sstrncpy (service_buffer, &name_buffer[1], sizeof (service_buffer));
 585                 else
 586                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s",
 587                                         host->event_service_prefix, &name_buffer[1]);
 588         }
 589
 590         event->service = strdup (service_buffer);
 591
 592         DEBUG ("write_riemann plugin: Successfully created protobuf for metric: "
 593                         "host = \"%s\", service = \"%s\"",
 594                         event->host, event->service);
 595         return (event);
 596 } /* }}} Event *riemann_value_to_protobuf */
 597
 598 static Msg *riemann_value_list_to_protobuf (struct riemann_host const *host, /* {{{ */
 599                                             data_set_t const *ds,
 600                                             value_list_t const *vl,
 601                                             int *statuses)
 602 {
 603         Msg *msg;
 604         size_t i;
 605         gauge_t *rates = NULL;
 606
 607         /* Initialize the Msg structure. */
 608         msg = malloc (sizeof (*msg));
 609         if (msg == NULL)
 610         {
 611                 ERROR ("write_riemann plugin: malloc failed.");
 612                 return (NULL);
 613         }
 614         memset (msg, 0, sizeof (*msg));
 615         msg__init (msg);
 616
 617         /* Set up events. First, the list of pointers. */
 618         msg->n_events = (size_t) vl->values_len;
 619         msg->events = calloc (msg->n_events, sizeof (*msg->events));
 620         if (msg->events == NULL)
 621         {
 622                 ERROR ("write_riemann plugin: calloc failed.");
 623                 riemann_msg_protobuf_free (msg);
 624                 return (NULL);
 625         }
 626
 627         if (host->store_rates)
 628         {
 629                 rates = uc_get_rate (ds, vl);
 630                 if (rates == NULL)
 631                 {
 632                         ERROR ("write_riemann plugin: uc_get_rate failed.");
 633                         riemann_msg_protobuf_free (msg);
 634                         return (NULL);
 635                 }
 636         }
 637
 638         for (i = 0; i < msg->n_events; i++)
 639         {
 640                 msg->events[i] = riemann_value_to_protobuf (host, ds, vl,
 641                                                             (int) i, rates, statuses[i]);
 642                 if (msg->events[i] == NULL)
 643                 {
 644                         riemann_msg_protobuf_free (msg);
 645                         sfree (rates);
 646                         return (NULL);
 647                 }
 648         }
 649
 650         sfree (rates);
 651         return (msg);
 652 } /* }}} Msg *riemann_value_list_to_protobuf */
 653
 654 static int riemann_notification(const notification_t *n, user_data_t *ud) /* {{{ */
 655 {
 656         int                      status;
 657         struct riemann_host     *host = ud->data;
 658         Msg                     *msg;
 659
 660         if (!host->notifications)
 661                 return 0;
 662
 663         msg = riemann_notification_to_protobuf (host, n);
 664         if (msg == NULL)
 665                 return (-1);
 666
 667         status = riemann_send (host, msg);
 668         if (status != 0)
 669                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
 670                                 status);
 671
 672         riemann_msg_protobuf_free (msg);
 673         return (status);
 674 } /* }}} int riemann_notification */
 675
 676 static int riemann_write(const data_set_t *ds, /* {{{ */
 677               const value_list_t *vl,
 678               user_data_t *ud)
 679 {
 680         int                      status;
 681         int                      statuses[vl->values_len];
 682         struct riemann_host     *host = ud->data;
 683         Msg                     *msg;
 684
 685         if (host->check_thresholds)
 686                 write_riemann_threshold_check(ds, vl, statuses);
 687         msg = riemann_value_list_to_protobuf (host, ds, vl, statuses);
 688         if (msg == NULL)
 689                 return (-1);
 690
 691         status = riemann_send (host, msg);
 692         if (status != 0)
 693                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
 694                                 status);
 695
 696         riemann_msg_protobuf_free (msg);
 697         return status;
 698 } /* }}} int riemann_write */
 699
 700 static void riemann_free(void *p) /* {{{ */
 701 {
 702         struct riemann_host     *host = p;
 703
 704         if (host == NULL)
 705                 return;
 706
 707         pthread_mutex_lock (&host->lock);
 708
 709         host->reference_count--;
 710         if (host->reference_count > 0)
 711         {
 712                 pthread_mutex_unlock (&host->lock);
 713                 return;
 714         }
 715
 716         riemann_disconnect (host);
 717
 718         sfree(host->service);
 719         pthread_mutex_destroy (&host->lock);
 720         sfree(host);
 721 } /* }}} void riemann_free */
 722
 723 static int riemann_config_node(oconfig_item_t *ci) /* {{{ */
 724 {
 725         struct riemann_host     *host = NULL;
 726         int                      status = 0;
 727         int                      i;
 728         oconfig_item_t          *child;
 729         char                     callback_name[DATA_MAX_NAME_LEN];
 730         user_data_t              ud;
 731
 732         if ((host = calloc(1, sizeof (*host))) == NULL) {
 733                 ERROR ("write_riemann plugin: calloc failed.");
 734                 return ENOMEM;
 735         }
 736         pthread_mutex_init (&host->lock, NULL);
 737         host->reference_count = 1;
 738         host->node = NULL;
 739         host->service = NULL;
 740         host->notifications = 1;
 741         host->check_thresholds = 0;
 742         host->store_rates = 1;
 743         host->always_append_ds = 0;
 744         host->use_tcp = 0;
 745         host->ttl_factor = RIEMANN_TTL_FACTOR;
 746
 747         status = cf_util_get_string (ci, &host->name);
 748         if (status != 0) {
 749                 WARNING("write_riemann plugin: Required host name is missing.");
 750                 riemann_free (host);
 751                 return -1;
 752         }
 753
 754         for (i = 0; i < ci->children_num; i++) {
 755                 /*
 756                  * The code here could be simplified but makes room
 757                  * for easy adding of new options later on.
 758                  */
 759                 child = &ci->children[i];
 760                 status = 0;
 761
 762                 if (strcasecmp ("Host", child->key) == 0) {
 763                         status = cf_util_get_string (child, &host->node);
 764                         if (status != 0)
 765                                 break;
 766                 } else if (strcasecmp ("Notifications", child->key) == 0) {
 767                         status = cf_util_get_boolean(child, &host->notifications);
 768                         if (status != 0)
 769                                 break;
 770                 } else if (strcasecmp ("EventServicePrefix", child->key) == 0) {
 771                         status = cf_util_get_string (child, &host->event_service_prefix);
 772                         if (status != 0)
 773                                 break;
 774                 } else if (strcasecmp ("CheckThresholds", child->key) == 0) {
 775                         status = cf_util_get_boolean(child, &host->check_thresholds);
 776                         if (status != 0)
 777                                 break;
 778                 } else if (strcasecmp ("Port", child->key) == 0) {
 779                         status = cf_util_get_service (child, &host->service);
 780                         if (status != 0) {
 781                                 ERROR ("write_riemann plugin: Invalid argument "
 782                                                 "configured for the \"Port\" "
 783                                                 "option.");
 784                                 break;
 785                         }
 786                 } else if (strcasecmp ("Protocol", child->key) == 0) {
 787                         char tmp[16];
 788                         status = cf_util_get_string_buffer (child,
 789                                         tmp, sizeof (tmp));
 790                         if (status != 0)
 791                         {
 792                                 ERROR ("write_riemann plugin: cf_util_get_"
 793                                                 "string_buffer failed with "
 794                                                 "status %i.", status);
 795                                 break;
 796                         }
 797
 798                         if (strcasecmp ("UDP", tmp) == 0)
 799                                 host->use_tcp = 0;
 800                         else if (strcasecmp ("TCP", tmp) == 0)
 801                                 host->use_tcp = 1;
 802                         else
 803                                 WARNING ("write_riemann plugin: The value "
 804                                                 "\"%s\" is not valid for the "
 805                                                 "\"Protocol\" option. Use "
 806                                                 "either \"UDP\" or \"TCP\".",
 807                                                 tmp);
 808                 } else if (strcasecmp ("StoreRates", child->key) == 0) {
 809                         status = cf_util_get_boolean (child, &host->store_rates);
 810                         if (status != 0)
 811                                 break;
 812                 } else if (strcasecmp ("AlwaysAppendDS", child->key) == 0) {
 813                         status = cf_util_get_boolean (child,
 814                                         &host->always_append_ds);
 815                         if (status != 0)
 816                                 break;
 817                 } else if (strcasecmp ("TTLFactor", child->key) == 0) {
 818                         double tmp = NAN;
 819                         status = cf_util_get_double (child, &tmp);
 820                         if (status != 0)
 821                                 break;
 822                         if (tmp >= 2.0) {
 823                                 host->ttl_factor = tmp;
 824                         } else if (tmp >= 1.0) {
 825                                 NOTICE ("write_riemann plugin: The configured "
 826                                                 "TTLFactor is very small "
 827                                                 "(%.1f). A value of 2.0 or "
 828                                                 "greater is recommended.",
 829                                                 tmp);
 830                                 host->ttl_factor = tmp;
 831                         } else if (tmp > 0.0) {
 832                                 WARNING ("write_riemann plugin: The configured "
 833                                                 "TTLFactor is too small to be "
 834                                                 "useful (%.1f). I'll use it "
 835                                                 "since the user knows best, "
 836                                                 "but under protest.",
 837                                                 tmp);
 838                                 host->ttl_factor = tmp;
 839                         } else { /* zero, negative and NAN */
 840                                 ERROR ("write_riemann plugin: The configured "
 841                                                 "TTLFactor is invalid (%.1f).",
 842                                                 tmp);
 843                         }
 844                 } else {
 845                         WARNING("write_riemann plugin: ignoring unknown config "
 846                                 "option: \"%s\"", child->key);
 847                 }
 848         }
 849         if (status != 0) {
 850                 riemann_free (host);
 851                 return status;
 852         }
 853
 854         ssnprintf (callback_name, sizeof (callback_name), "write_riemann/%s",
 855                         host->name);
 856         ud.data = host;
 857         ud.free_func = riemann_free;
 858
 859         pthread_mutex_lock (&host->lock);
 860
 861         status = plugin_register_write (callback_name, riemann_write, &ud);
 862         if (status != 0)
 863                 WARNING ("write_riemann plugin: plugin_register_write (\"%s\") "
 864                                 "failed with status %i.",
 865                                 callback_name, status);
 866         else /* success */
 867                 host->reference_count++;
 868
 869         status = plugin_register_notification (callback_name,
 870                         riemann_notification, &ud);
 871         if (status != 0)
 872                 WARNING ("write_riemann plugin: plugin_register_notification (\"%s\") "
 873                                 "failed with status %i.",
 874                                 callback_name, status);
 875         else /* success */
 876                 host->reference_count++;
 877
 878         if (host->reference_count <= 1)
 879         {
 880                 /* Both callbacks failed => free memory.
 881                  * We need to unlock here, because riemann_free() will lock.
 882                  * This is not a race condition, because we're the only one
 883                  * holding a reference. */
 884                 pthread_mutex_unlock (&host->lock);
 885                 riemann_free (host);
 886                 return (-1);
 887         }
 888
 889         host->reference_count--;
 890         pthread_mutex_unlock (&host->lock);
 891
 892         return status;
 893 } /* }}} int riemann_config_node */
 894
 895 static int riemann_config(oconfig_item_t *ci) /* {{{ */
 896 {
 897         int              i;
 898         oconfig_item_t  *child;
 899         int              status;
 900
 901         for (i = 0; i < ci->children_num; i++)  {
 902                 child = &ci->children[i];
 903
 904                 if (strcasecmp("Node", child->key) == 0) {
 905                         riemann_config_node (child);
 906                 } else if (strcasecmp(child->key, "attribute") == 0) {
 907                         char *key = NULL;
 908                         char *val = NULL;
 909
 910                         if (child->values_num != 2) {
 911                                 WARNING("riemann attributes need both a key and a value.");
 912                                 return (-1);
 913                         }
 914                         if (child->values[0].type != OCONFIG_TYPE_STRING ||
 915                             child->values[1].type != OCONFIG_TYPE_STRING) {
 916                                 WARNING("riemann attribute needs string arguments.");
 917                                 return (-1);
 918                         }
 919                         if ((key = strdup(child->values[0].value.string)) == NULL) {
 920                                 WARNING("cannot allocate memory for attribute key.");
 921                                 return (-1);
 922                         }
 923                         if ((val = strdup(child->values[1].value.string)) == NULL) {
 924                                 WARNING("cannot allocate memory for attribute value.");
 925                                 return (-1);
 926                         }
 927                         strarray_add(&riemann_attrs, &riemann_attrs_num, key);
 928                         strarray_add(&riemann_attrs, &riemann_attrs_num, val);
 929                         DEBUG("write_riemann: got attr: %s => %s", key, val);
 930                         sfree(key);
 931                         sfree(val);
 932                 } else if (strcasecmp(child->key, "tag") == 0) {
 933                         char *tmp = NULL;
 934                         status = cf_util_get_string(child, &tmp);
 935                         if (status != 0)
 936                                 continue;
 937
 938                         strarray_add (&riemann_tags, &riemann_tags_num, tmp);
 939                         DEBUG("write_riemann plugin: Got tag: %s", tmp);
 940                         sfree (tmp);
 941                 } else {
 942                         WARNING ("write_riemann plugin: Ignoring unknown "
 943                                  "configuration option \"%s\" at top level.",
 944                                  child->key);
 945                 }
 946         }
 947         return (0);
 948 } /* }}} int riemann_config */
 949
 950 void module_register(void)
 951 {
 952         plugin_register_complex_config ("write_riemann", riemann_config);
 953 }
 954
 955 /* vim: set sw=8 sts=8 ts=8 noet : */