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 <arpa/inet.h>
  30 #include <errno.h>
  31 #include <netdb.h>
  32 #include <inttypes.h>
  33 #include <pthread.h>
  34
  35 #include "collectd.h"
  36 #include "plugin.h"
  37 #include "common.h"
  38 #include "configfile.h"
  39 #include "utils_cache.h"
  40 #include "riemann.pb-c.h"
  41 #include "write_riemann_threshold.h"
  42
  43 #define RIEMANN_HOST            "localhost"
  44 #define RIEMANN_PORT            "5555"
  45 #define RIEMANN_TTL_FACTOR      2.0
  46 #define RIEMANN_BATCH_MAX      8192
  47
  48 struct riemann_host {
  49         char                    *name;
  50         char                    *event_service_prefix;
  51 #define F_CONNECT        0x01
  52         uint8_t                  flags;
  53         pthread_mutex_t  lock;
  54     _Bool            batch_mode;
  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     Msg             *batch_msg;
  65     cdtime_t         batch_init;
  66     int              batch_max;
  67         int                          reference_count;
  68 };
  69
  70 static char     **riemann_tags;
  71 static size_t     riemann_tags_num;
  72 static char     **riemann_attrs;
  73 static size_t     riemann_attrs_num;
  74
  75 static void riemann_event_protobuf_free (Event *event) /* {{{ */
  76 {
  77         size_t i;
  78
  79         if (event == NULL)
  80                 return;
  81
  82         sfree (event->state);
  83         sfree (event->service);
  84         sfree (event->host);
  85         sfree (event->description);
  86
  87         strarray_free (event->tags, event->n_tags);
  88         event->tags = NULL;
  89         event->n_tags = 0;
  90
  91         for (i = 0; i < event->n_attributes; i++)
  92         {
  93                 sfree (event->attributes[i]->key);
  94                 sfree (event->attributes[i]->value);
  95                 sfree (event->attributes[i]);
  96         }
  97         sfree (event->attributes);
  98         event->n_attributes = 0;
  99
 100         sfree (event);
 101 } /* }}} void riemann_event_protobuf_free */
 102
 103 static void riemann_msg_protobuf_free(Msg *msg) /* {{{ */
 104 {
 105         size_t i;
 106
 107         if (msg == NULL)
 108                 return;
 109
 110         for (i = 0; i < msg->n_events; i++)
 111         {
 112                 riemann_event_protobuf_free (msg->events[i]);
 113                 msg->events[i] = NULL;
 114         }
 115
 116         sfree (msg->events);
 117         msg->n_events = 0;
 118
 119         sfree (msg);
 120 } /* }}} void riemann_msg_protobuf_free */
 121
 122 /* host->lock must be held when calling this function. */
 123 static int riemann_connect(struct riemann_host *host) /* {{{ */
 124 {
 125         int                      e;
 126         struct addrinfo         *ai, *res, hints;
 127         char const              *node;
 128         char const              *service;
 129
 130         if (host->flags & F_CONNECT)
 131                 return 0;
 132
 133         memset(&hints, 0, sizeof(hints));
 134         memset(&service, 0, sizeof(service));
 135         hints.ai_family = AF_UNSPEC;
 136         hints.ai_socktype = host->use_tcp ? SOCK_STREAM : SOCK_DGRAM;
 137 #ifdef AI_ADDRCONFIG
 138         hints.ai_flags |= AI_ADDRCONFIG;
 139 #endif
 140
 141         node = (host->node != NULL) ? host->node : RIEMANN_HOST;
 142         service = (host->service != NULL) ? host->service : RIEMANN_PORT;
 143
 144         if ((e = getaddrinfo(node, service, &hints, &res)) != 0) {
 145                 ERROR ("write_riemann plugin: Unable to resolve host \"%s\": %s",
 146                         node, gai_strerror(e));
 147                 return -1;
 148         }
 149
 150         host->s = -1;
 151         for (ai = res; ai != NULL; ai = ai->ai_next) {
 152                 if ((host->s = socket(ai->ai_family,
 153                                       ai->ai_socktype,
 154                                       ai->ai_protocol)) == -1) {
 155                         continue;
 156                 }
 157
 158                 if (connect(host->s, ai->ai_addr, ai->ai_addrlen) != 0) {
 159                         close(host->s);
 160                         host->s = -1;
 161                         continue;
 162                 }
 163
 164                 host->flags |= F_CONNECT;
 165                 DEBUG("write_riemann plugin: got a successful connection for: %s:%s",
 166                                 node, service);
 167                 break;
 168         }
 169
 170         freeaddrinfo(res);
 171
 172         if (host->s < 0) {
 173                 WARNING("write_riemann plugin: Unable to connect to Riemann at %s:%s",
 174                                 node, service);
 175                 return -1;
 176         }
 177         return 0;
 178 } /* }}} int riemann_connect */
 179
 180 /* host->lock must be held when calling this function. */
 181 static int riemann_disconnect (struct riemann_host *host) /* {{{ */
 182 {
 183         if ((host->flags & F_CONNECT) == 0)
 184                 return (0);
 185
 186         close (host->s);
 187         host->s = -1;
 188         host->flags &= ~F_CONNECT;
 189
 190         return (0);
 191 } /* }}} int riemann_disconnect */
 192
 193 static int riemann_send_msg (struct riemann_host *host, const Msg *msg) /* {{{ */
 194 {
 195         int status = 0;
 196         u_char *buffer = NULL;
 197         size_t  buffer_len;
 198
 199         status = riemann_connect (host);
 200         if (status != 0)
 201                 return status;
 202
 203         buffer_len = msg__get_packed_size(msg);
 204
 205         if (host->use_tcp)
 206                 buffer_len += 4;
 207
 208         buffer = malloc (buffer_len);
 209         if (buffer == NULL) {
 210                 ERROR ("write_riemann plugin: malloc failed.");
 211                 return ENOMEM;
 212         }
 213         memset (buffer, 0, buffer_len);
 214
 215         if (host->use_tcp)
 216         {
 217                 uint32_t length = htonl ((uint32_t) (buffer_len - 4));
 218                 memcpy (buffer, &length, 4);
 219                 msg__pack(msg, buffer + 4);
 220         }
 221         else
 222         {
 223                 msg__pack(msg, buffer);
 224         }
 225
 226         status = (int) swrite (host->s, buffer, buffer_len);
 227         if (status != 0)
 228         {
 229                 char errbuf[1024];
 230                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s failed: %s",
 231                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 232                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 233                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 234                 sfree (buffer);
 235                 return -1;
 236         }
 237
 238         sfree (buffer);
 239         return 0;
 240 } /* }}} int riemann_send_msg */
 241
 242 static int riemann_recv_ack(struct riemann_host *host) /* {{{ */
 243 {
 244         int status = 0;
 245         Msg *msg = NULL;
 246         uint32_t header;
 247
 248         status = (int) sread (host->s, &header, 4);
 249
 250         if (status != 0)
 251                 return -1;
 252
 253         size_t size = ntohl(header);
 254
 255         // Buffer on the stack since acknowledges are typically small.
 256         u_char buffer[size];
 257         memset (buffer, 0, size);
 258
 259         status = (int) sread (host->s, buffer, size);
 260
 261         if (status != 0)
 262                 return status;
 263
 264         msg = msg__unpack (NULL, size, buffer);
 265
 266         if (msg == NULL)
 267                 return -1;
 268
 269         if (!msg->ok)
 270         {
 271                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s acknowledgement message reported error: %s",
 272                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 273                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 274                                 msg->error);
 275
 276                 msg__free_unpacked(msg, NULL);
 277                 return -1;
 278         }
 279
 280         msg__free_unpacked (msg, NULL);
 281         return 0;
 282 } /* }}} int riemann_recv_ack */
 283
 284 /**
 285  * Function to send messages (Msg) to riemann.
 286  *
 287  * Acquires the host lock, disconnects on errors.
 288  */
 289 static int riemann_send(struct riemann_host *host, Msg const *msg) /* {{{ */
 290 {
 291         int status = 0;
 292         pthread_mutex_lock (&host->lock);
 293
 294         status = riemann_send_msg(host, msg);
 295         if (status != 0) {
 296                 riemann_disconnect (host);
 297                 pthread_mutex_unlock (&host->lock);
 298                 return status;
 299         }
 300
 301         /*
 302          * For TCP we need to receive message acknowledgemenent.
 303          */
 304         if (host->use_tcp)
 305         {
 306                 status = riemann_recv_ack(host);
 307
 308                 if (status != 0)
 309                 {
 310                         riemann_disconnect (host);
 311                         pthread_mutex_unlock (&host->lock);
 312                         return status;
 313                 }
 314         }
 315
 316         pthread_mutex_unlock (&host->lock);
 317         return 0;
 318 } /* }}} int riemann_send */
 319
 320 static int riemann_event_add_tag (Event *event, char const *tag) /* {{{ */
 321 {
 322         return (strarray_add (&event->tags, &event->n_tags, tag));
 323 } /* }}} int riemann_event_add_tag */
 324
 325 static int riemann_event_add_attribute(Event *event, /* {{{ */
 326                 char const *key, char const *value)
 327 {
 328         Attribute **new_attributes;
 329         Attribute *a;
 330
 331         new_attributes = realloc (event->attributes,
 332                         sizeof (*event->attributes) * (event->n_attributes + 1));
 333         if (new_attributes == NULL)
 334         {
 335                 ERROR ("write_riemann plugin: realloc failed.");
 336                 return (ENOMEM);
 337         }
 338         event->attributes = new_attributes;
 339
 340         a = malloc (sizeof (*a));
 341         if (a == NULL)
 342         {
 343                 ERROR ("write_riemann plugin: malloc failed.");
 344                 return (ENOMEM);
 345         }
 346         attribute__init (a);
 347
 348         a->key = strdup (key);
 349         if (value != NULL)
 350                 a->value = strdup (value);
 351
 352         event->attributes[event->n_attributes] = a;
 353         event->n_attributes++;
 354
 355         return (0);
 356 } /* }}} int riemann_event_add_attribute */
 357
 358 static Msg *riemann_notification_to_protobuf(struct riemann_host *host, /* {{{ */
 359                 notification_t const *n)
 360 {
 361         Msg *msg;
 362         Event *event;
 363         char service_buffer[6 * DATA_MAX_NAME_LEN];
 364         char const *severity;
 365         notification_meta_t *meta;
 366         size_t i;
 367
 368         msg = malloc (sizeof (*msg));
 369         if (msg == NULL)
 370         {
 371                 ERROR ("write_riemann plugin: malloc failed.");
 372                 return (NULL);
 373         }
 374         memset (msg, 0, sizeof (*msg));
 375         msg__init (msg);
 376
 377         msg->events = malloc (sizeof (*msg->events));
 378         if (msg->events == NULL)
 379         {
 380                 ERROR ("write_riemann plugin: malloc failed.");
 381                 sfree (msg);
 382                 return (NULL);
 383         }
 384
 385         event = malloc (sizeof (*event));
 386         if (event == NULL)
 387         {
 388                 ERROR ("write_riemann plugin: malloc failed.");
 389                 sfree (msg->events);
 390                 sfree (msg);
 391                 return (NULL);
 392         }
 393         memset (event, 0, sizeof (*event));
 394         event__init (event);
 395
 396         msg->events[0] = event;
 397         msg->n_events = 1;
 398
 399         event->host = strdup (n->host);
 400         event->time = CDTIME_T_TO_TIME_T (n->time);
 401         event->has_time = 1;
 402
 403         switch (n->severity)
 404         {
 405                 case NOTIF_OKAY:        severity = "ok"; break;
 406                 case NOTIF_WARNING:     severity = "warning"; break;
 407                 case NOTIF_FAILURE:     severity = "critical"; break;
 408                 default:                severity = "unknown";
 409         }
 410         event->state = strdup (severity);
 411
 412         riemann_event_add_tag (event, "notification");
 413         if (n->host[0] != 0)
 414                 riemann_event_add_attribute (event, "host", n->host);
 415         if (n->plugin[0] != 0)
 416                 riemann_event_add_attribute (event, "plugin", n->plugin);
 417         if (n->plugin_instance[0] != 0)
 418                 riemann_event_add_attribute (event, "plugin_instance",
 419                                 n->plugin_instance);
 420
 421         if (n->type[0] != 0)
 422                 riemann_event_add_attribute (event, "type", n->type);
 423         if (n->type_instance[0] != 0)
 424                 riemann_event_add_attribute (event, "type_instance",
 425                                 n->type_instance);
 426
 427         for (i = 0; i < riemann_attrs_num; i += 2)
 428                 riemann_event_add_attribute(event,
 429                                             riemann_attrs[i],
 430                                             riemann_attrs[i +1]);
 431
 432         for (i = 0; i < riemann_tags_num; i++)
 433                 riemann_event_add_tag (event, riemann_tags[i]);
 434
 435         format_name (service_buffer, sizeof (service_buffer),
 436                         /* host = */ "", n->plugin, n->plugin_instance,
 437                         n->type, n->type_instance);
 438         event->service = strdup (&service_buffer[1]);
 439
 440         if (n->message[0] != 0)
 441                 riemann_event_add_attribute (event, "description", n->message);
 442
 443         /* Pull in values from threshold and add extra attributes */
 444         for (meta = n->meta; meta != NULL; meta = meta->next)
 445         {
 446                 if (strcasecmp ("CurrentValue", meta->name) == 0 && meta->type == NM_TYPE_DOUBLE)
 447                 {
 448                         event->metric_d = meta->nm_value.nm_double;
 449                         event->has_metric_d = 1;
 450                         continue;
 451                 }
 452
 453                 if (meta->type == NM_TYPE_STRING) {
 454                         riemann_event_add_attribute (event, meta->name, meta->nm_value.nm_string);
 455                         continue;
 456                 }
 457         }
 458
 459         DEBUG ("write_riemann plugin: Successfully created protobuf for notification: "
 460                         "host = \"%s\", service = \"%s\", state = \"%s\"",
 461                         event->host, event->service, event->state);
 462         return (msg);
 463 } /* }}} Msg *riemann_notification_to_protobuf */
 464
 465 static Event *riemann_value_to_protobuf(struct riemann_host const *host, /* {{{ */
 466                 data_set_t const *ds,
 467                 value_list_t const *vl, size_t index,
 468                                          gauge_t const *rates,
 469                                          int status)
 470 {
 471         Event *event;
 472         char name_buffer[5 * DATA_MAX_NAME_LEN];
 473         char service_buffer[6 * DATA_MAX_NAME_LEN];
 474         double ttl;
 475         size_t i;
 476
 477         event = malloc (sizeof (*event));
 478         if (event == NULL)
 479         {
 480                 ERROR ("write_riemann plugin: malloc failed.");
 481                 return (NULL);
 482         }
 483         memset (event, 0, sizeof (*event));
 484         event__init (event);
 485
 486         event->host = strdup (vl->host);
 487         event->time = CDTIME_T_TO_TIME_T (vl->time);
 488         event->has_time = 1;
 489
 490         if (host->check_thresholds) {
 491                 switch (status) {
 492                         case STATE_OKAY:
 493                                 event->state = strdup("ok");
 494                                 break;
 495                         case STATE_ERROR:
 496                                 event->state = strdup("critical");
 497                                 break;
 498                         case STATE_WARNING:
 499                                 event->state = strdup("warning");
 500                                 break;
 501                         case STATE_MISSING:
 502                                 event->state = strdup("unknown");
 503                                 break;
 504                 }
 505         }
 506
 507         ttl = CDTIME_T_TO_DOUBLE (vl->interval) * host->ttl_factor;
 508         event->ttl = (float) ttl;
 509         event->has_ttl = 1;
 510
 511         riemann_event_add_attribute (event, "plugin", vl->plugin);
 512         if (vl->plugin_instance[0] != 0)
 513                 riemann_event_add_attribute (event, "plugin_instance",
 514                                 vl->plugin_instance);
 515
 516         riemann_event_add_attribute (event, "type", vl->type);
 517         if (vl->type_instance[0] != 0)
 518                 riemann_event_add_attribute (event, "type_instance",
 519                                 vl->type_instance);
 520
 521         if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL))
 522         {
 523                 char ds_type[DATA_MAX_NAME_LEN];
 524
 525                 ssnprintf (ds_type, sizeof (ds_type), "%s:rate",
 526                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 527                 riemann_event_add_attribute (event, "ds_type", ds_type);
 528         }
 529         else
 530         {
 531                 riemann_event_add_attribute (event, "ds_type",
 532                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 533         }
 534         riemann_event_add_attribute (event, "ds_name", ds->ds[index].name);
 535         {
 536                 char ds_index[DATA_MAX_NAME_LEN];
 537
 538                 ssnprintf (ds_index, sizeof (ds_index), "%zu", index);
 539                 riemann_event_add_attribute (event, "ds_index", ds_index);
 540         }
 541
 542         for (i = 0; i < riemann_attrs_num; i += 2)
 543                 riemann_event_add_attribute(event,
 544                                             riemann_attrs[i],
 545                                             riemann_attrs[i +1]);
 546
 547         for (i = 0; i < riemann_tags_num; i++)
 548                 riemann_event_add_tag (event, riemann_tags[i]);
 549
 550         if (ds->ds[index].type == DS_TYPE_GAUGE)
 551         {
 552                 event->has_metric_d = 1;
 553                 event->metric_d = (double) vl->values[index].gauge;
 554         }
 555         else if (rates != NULL)
 556         {
 557                 event->has_metric_d = 1;
 558                 event->metric_d = (double) rates[index];
 559         }
 560         else
 561         {
 562                 event->has_metric_sint64 = 1;
 563                 if (ds->ds[index].type == DS_TYPE_DERIVE)
 564                         event->metric_sint64 = (int64_t) vl->values[index].derive;
 565                 else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
 566                         event->metric_sint64 = (int64_t) vl->values[index].absolute;
 567                 else
 568                         event->metric_sint64 = (int64_t) vl->values[index].counter;
 569         }
 570
 571         format_name (name_buffer, sizeof (name_buffer),
 572                         /* host = */ "", vl->plugin, vl->plugin_instance,
 573                         vl->type, vl->type_instance);
 574         if (host->always_append_ds || (ds->ds_num > 1))
 575         {
 576                 if (host->event_service_prefix == NULL)
 577                         ssnprintf (service_buffer, sizeof (service_buffer), "%s/%s",
 578                                         &name_buffer[1], ds->ds[index].name);
 579                 else
 580                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s/%s",
 581                                         host->event_service_prefix, &name_buffer[1], ds->ds[index].name);
 582         }
 583         else
 584         {
 585                 if (host->event_service_prefix == NULL)
 586                         sstrncpy (service_buffer, &name_buffer[1], sizeof (service_buffer));
 587                 else
 588                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s",
 589                                         host->event_service_prefix, &name_buffer[1]);
 590         }
 591
 592         event->service = strdup (service_buffer);
 593
 594         DEBUG ("write_riemann plugin: Successfully created protobuf for metric: "
 595                         "host = \"%s\", service = \"%s\"",
 596                         event->host, event->service);
 597         return (event);
 598 } /* }}} Event *riemann_value_to_protobuf */
 599
 600 static Msg *riemann_value_list_to_protobuf (struct riemann_host const *host, /* {{{ */
 601                                             data_set_t const *ds,
 602                                             value_list_t const *vl,
 603                                             int *statuses)
 604 {
 605         Msg *msg;
 606         size_t i;
 607         gauge_t *rates = NULL;
 608
 609         /* Initialize the Msg structure. */
 610         msg = malloc (sizeof (*msg));
 611         if (msg == NULL)
 612         {
 613                 ERROR ("write_riemann plugin: malloc failed.");
 614                 return (NULL);
 615         }
 616         memset (msg, 0, sizeof (*msg));
 617         msg__init (msg);
 618
 619         /* Set up events. First, the list of pointers. */
 620         msg->n_events = vl->values_len;
 621         msg->events = calloc (msg->n_events, sizeof (*msg->events));
 622         if (msg->events == NULL)
 623         {
 624                 ERROR ("write_riemann plugin: calloc failed.");
 625                 riemann_msg_protobuf_free (msg);
 626                 return (NULL);
 627         }
 628
 629         if (host->store_rates)
 630         {
 631                 rates = uc_get_rate (ds, vl);
 632                 if (rates == NULL)
 633                 {
 634                         ERROR ("write_riemann plugin: uc_get_rate failed.");
 635                         riemann_msg_protobuf_free (msg);
 636                         return (NULL);
 637                 }
 638         }
 639
 640         for (i = 0; i < msg->n_events; i++)
 641         {
 642                 msg->events[i] = riemann_value_to_protobuf (host, ds, vl,
 643                                                             (int) i, rates, statuses[i]);
 644                 if (msg->events[i] == NULL)
 645                 {
 646                         riemann_msg_protobuf_free (msg);
 647                         sfree (rates);
 648                         return (NULL);
 649                 }
 650         }
 651
 652         sfree (rates);
 653         return (msg);
 654 } /* }}} Msg *riemann_value_list_to_protobuf */
 655
 656
 657 /*
 658  * Always call while holding host->lock !
 659  */
 660 static int riemann_batch_flush_nolock (cdtime_t timeout,
 661                                        struct riemann_host *host)
 662 {
 663     cdtime_t    now;
 664     int         status = 0;
 665
 666     if (timeout > 0) {
 667         now = cdtime ();
 668         if ((host->batch_init + timeout) > now)
 669             return status;
 670     }
 671     riemann_send_msg(host, host->batch_msg);
 672     riemann_msg_protobuf_free(host->batch_msg);
 673
 674         if (host->use_tcp && ((status = riemann_recv_ack(host)) != 0))
 675         riemann_disconnect (host);
 676
 677     host->batch_init = cdtime();
 678     host->batch_msg = NULL;
 679     return status;
 680 }
 681
 682 static int riemann_batch_flush (cdtime_t timeout,
 683         const char *identifier __attribute__((unused)),
 684         user_data_t *user_data)
 685 {
 686     struct riemann_host *host;
 687     int status;
 688
 689     if (user_data == NULL)
 690         return (-EINVAL);
 691
 692     host = user_data->data;
 693     pthread_mutex_lock (&host->lock);
 694     status = riemann_batch_flush_nolock (timeout, host);
 695     if (status != 0)
 696         ERROR ("write_riemann plugin: riemann_send failed with status %i",
 697                status);
 698
 699     pthread_mutex_unlock(&host->lock);
 700     return status;
 701 }
 702
 703 static int riemann_batch_add_value_list (struct riemann_host *host, /* {{{ */
 704                                          data_set_t const *ds,
 705                                          value_list_t const *vl,
 706                                          int *statuses)
 707 {
 708         size_t i;
 709     Event **events;
 710     Msg *msg;
 711     size_t len;
 712     int ret;
 713
 714     msg = riemann_value_list_to_protobuf (host, ds, vl, statuses);
 715     if (msg == NULL)
 716         return -1;
 717
 718     pthread_mutex_lock(&host->lock);
 719
 720     if (host->batch_msg == NULL) {
 721         host->batch_msg = msg;
 722     } else {
 723         len = msg->n_events + host->batch_msg->n_events;
 724         events = realloc(host->batch_msg->events,
 725                          (len * sizeof(*host->batch_msg->events)));
 726         if (events == NULL) {
 727             pthread_mutex_unlock(&host->lock);
 728             ERROR ("write_riemann plugin: out of memory");
 729             riemann_msg_protobuf_free (msg);
 730             return -1;
 731         }
 732         host->batch_msg->events = events;
 733
 734         for (i = host->batch_msg->n_events; i < len; i++)
 735             host->batch_msg->events[i] = msg->events[i - host->batch_msg->n_events];
 736
 737         host->batch_msg->n_events = len;
 738         sfree (msg->events);
 739         msg->n_events = 0;
 740         sfree (msg);
 741     }
 742
 743         len = msg__get_packed_size(host->batch_msg);
 744     ret = 0;
 745     if ((host->batch_max < 0) || (((size_t) host->batch_max) <= len)) {
 746             ret = riemann_batch_flush_nolock(0, host);
 747     }
 748
 749     pthread_mutex_unlock(&host->lock);
 750     return ret;
 751 } /* }}} Msg *riemann_batch_add_value_list */
 752
 753 static int riemann_notification(const notification_t *n, user_data_t *ud) /* {{{ */
 754 {
 755         int                      status;
 756         struct riemann_host     *host = ud->data;
 757         Msg                     *msg;
 758
 759         if (!host->notifications)
 760                 return 0;
 761
 762     /*
 763      * Never batch for notifications, send them ASAP
 764      */
 765         msg = riemann_notification_to_protobuf (host, n);
 766         if (msg == NULL)
 767                 return (-1);
 768
 769         status = riemann_send (host, msg);
 770         if (status != 0)
 771                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
 772                                 status);
 773
 774         riemann_msg_protobuf_free (msg);
 775         return (status);
 776 } /* }}} int riemann_notification */
 777
 778 static int riemann_write(const data_set_t *ds, /* {{{ */
 779                 const value_list_t *vl,
 780                 user_data_t *ud)
 781 {
 782         int                      status = 0;
 783         int                      statuses[vl->values_len];
 784         struct riemann_host     *host = ud->data;
 785
 786         if (host->check_thresholds) {
 787                 status = write_riemann_threshold_check(ds, vl, statuses);
 788                 if (status != 0)
 789                         return status;
 790         } else {
 791                 memset (statuses, 0, sizeof (statuses));
 792         }
 793
 794         if (host->use_tcp == 1 && host->batch_mode) {
 795                 riemann_batch_add_value_list (host, ds, vl, statuses);
 796         } else {
 797                 Msg *msg = riemann_value_list_to_protobuf (host, ds, vl, statuses);
 798                 if (msg == NULL)
 799                         return (-1);
 800
 801                 status = riemann_send (host, msg);
 802                 if (status != 0)
 803                         ERROR ("write_riemann plugin: riemann_send failed with status %i", status);
 804
 805                 riemann_msg_protobuf_free (msg);
 806         }
 807
 808         return status;
 809 } /* }}} int riemann_write */
 810
 811 static void riemann_free(void *p) /* {{{ */
 812 {
 813         struct riemann_host     *host = p;
 814
 815         if (host == NULL)
 816                 return;
 817
 818         pthread_mutex_lock (&host->lock);
 819
 820         host->reference_count--;
 821         if (host->reference_count > 0)
 822         {
 823                 pthread_mutex_unlock (&host->lock);
 824                 return;
 825         }
 826
 827         riemann_disconnect (host);
 828
 829         sfree(host->service);
 830         pthread_mutex_destroy (&host->lock);
 831         sfree(host);
 832 } /* }}} void riemann_free */
 833
 834 static int riemann_config_node(oconfig_item_t *ci) /* {{{ */
 835 {
 836         struct riemann_host     *host = NULL;
 837         int                      status = 0;
 838         int                      i;
 839         oconfig_item_t          *child;
 840         char                     callback_name[DATA_MAX_NAME_LEN];
 841         user_data_t              ud;
 842
 843         if ((host = calloc(1, sizeof (*host))) == NULL) {
 844                 ERROR ("write_riemann plugin: calloc failed.");
 845                 return ENOMEM;
 846         }
 847         pthread_mutex_init (&host->lock, NULL);
 848         host->reference_count = 1;
 849         host->node = NULL;
 850         host->service = NULL;
 851         host->notifications = 1;
 852         host->check_thresholds = 0;
 853         host->store_rates = 1;
 854         host->always_append_ds = 0;
 855         host->use_tcp = 1;
 856         host->batch_mode = 1;
 857         host->batch_max = RIEMANN_BATCH_MAX; /* typical MSS */
 858         host->batch_init = cdtime();
 859         host->ttl_factor = RIEMANN_TTL_FACTOR;
 860
 861         status = cf_util_get_string (ci, &host->name);
 862         if (status != 0) {
 863                 WARNING("write_riemann plugin: Required host name is missing.");
 864                 riemann_free (host);
 865                 return -1;
 866         }
 867
 868         for (i = 0; i < ci->children_num; i++) {
 869                 /*
 870                  * The code here could be simplified but makes room
 871                  * for easy adding of new options later on.
 872                  */
 873                 child = &ci->children[i];
 874                 status = 0;
 875
 876                 if (strcasecmp ("Host", child->key) == 0) {
 877                         status = cf_util_get_string (child, &host->node);
 878                         if (status != 0)
 879                                 break;
 880                 } else if (strcasecmp ("Notifications", child->key) == 0) {
 881                         status = cf_util_get_boolean(child, &host->notifications);
 882                         if (status != 0)
 883                                 break;
 884                 } else if (strcasecmp ("EventServicePrefix", child->key) == 0) {
 885                         status = cf_util_get_string (child, &host->event_service_prefix);
 886                         if (status != 0)
 887                                 break;
 888                 } else if (strcasecmp ("CheckThresholds", child->key) == 0) {
 889                         status = cf_util_get_boolean(child, &host->check_thresholds);
 890                         if (status != 0)
 891                                 break;
 892         } else if (strcasecmp ("Batch", child->key) == 0) {
 893             status = cf_util_get_boolean(child, &host->batch_mode);
 894             if (status != 0)
 895                 break;
 896         } else if (strcasecmp("BatchMaxSize", child->key) == 0) {
 897             status = cf_util_get_int(child, &host->batch_max);
 898             if (status != 0)
 899                 break;
 900                 } else if (strcasecmp ("Port", child->key) == 0) {
 901                         status = cf_util_get_service (child, &host->service);
 902                         if (status != 0) {
 903                                 ERROR ("write_riemann plugin: Invalid argument "
 904                                                 "configured for the \"Port\" "
 905                                                 "option.");
 906                                 break;
 907                         }
 908                 } else if (strcasecmp ("Protocol", child->key) == 0) {
 909                         char tmp[16];
 910                         status = cf_util_get_string_buffer (child,
 911                                         tmp, sizeof (tmp));
 912                         if (status != 0)
 913                         {
 914                                 ERROR ("write_riemann plugin: cf_util_get_"
 915                                                 "string_buffer failed with "
 916                                                 "status %i.", status);
 917                                 break;
 918                         }
 919
 920                         if (strcasecmp ("UDP", tmp) == 0)
 921                                 host->use_tcp = 0;
 922                         else if (strcasecmp ("TCP", tmp) == 0)
 923                                 host->use_tcp = 1;
 924                         else
 925                                 WARNING ("write_riemann plugin: The value "
 926                                                 "\"%s\" is not valid for the "
 927                                                 "\"Protocol\" option. Use "
 928                                                 "either \"UDP\" or \"TCP\".",
 929                                                 tmp);
 930                 } else if (strcasecmp ("StoreRates", child->key) == 0) {
 931                         status = cf_util_get_boolean (child, &host->store_rates);
 932                         if (status != 0)
 933                                 break;
 934                 } else if (strcasecmp ("AlwaysAppendDS", child->key) == 0) {
 935                         status = cf_util_get_boolean (child,
 936                                         &host->always_append_ds);
 937                         if (status != 0)
 938                                 break;
 939                 } else if (strcasecmp ("TTLFactor", child->key) == 0) {
 940                         double tmp = NAN;
 941                         status = cf_util_get_double (child, &tmp);
 942                         if (status != 0)
 943                                 break;
 944                         if (tmp >= 2.0) {
 945                                 host->ttl_factor = tmp;
 946                         } else if (tmp >= 1.0) {
 947                                 NOTICE ("write_riemann plugin: The configured "
 948                                                 "TTLFactor is very small "
 949                                                 "(%.1f). A value of 2.0 or "
 950                                                 "greater is recommended.",
 951                                                 tmp);
 952                                 host->ttl_factor = tmp;
 953                         } else if (tmp > 0.0) {
 954                                 WARNING ("write_riemann plugin: The configured "
 955                                                 "TTLFactor is too small to be "
 956                                                 "useful (%.1f). I'll use it "
 957                                                 "since the user knows best, "
 958                                                 "but under protest.",
 959                                                 tmp);
 960                                 host->ttl_factor = tmp;
 961                         } else { /* zero, negative and NAN */
 962                                 ERROR ("write_riemann plugin: The configured "
 963                                                 "TTLFactor is invalid (%.1f).",
 964                                                 tmp);
 965                         }
 966                 } else {
 967                         WARNING("write_riemann plugin: ignoring unknown config "
 968                                 "option: \"%s\"", child->key);
 969                 }
 970         }
 971         if (status != 0) {
 972                 riemann_free (host);
 973                 return status;
 974         }
 975
 976         ssnprintf (callback_name, sizeof (callback_name), "write_riemann/%s",
 977                         host->name);
 978         ud.data = host;
 979         ud.free_func = riemann_free;
 980
 981         pthread_mutex_lock (&host->lock);
 982
 983         status = plugin_register_write (callback_name, riemann_write, &ud);
 984
 985     if (host->use_tcp == 1 && host->batch_mode) {
 986         ud.free_func = NULL;
 987         plugin_register_flush(callback_name, riemann_batch_flush, &ud);
 988     }
 989         if (status != 0)
 990                 WARNING ("write_riemann plugin: plugin_register_write (\"%s\") "
 991                                 "failed with status %i.",
 992                                 callback_name, status);
 993         else /* success */
 994                 host->reference_count++;
 995
 996         status = plugin_register_notification (callback_name,
 997                         riemann_notification, &ud);
 998         if (status != 0)
 999                 WARNING ("write_riemann plugin: plugin_register_notification (\"%s\") "
1000                                 "failed with status %i.",
1001                                 callback_name, status);
1002         else /* success */
1003                 host->reference_count++;
1004
1005         if (host->reference_count <= 1)
1006         {
1007                 /* Both callbacks failed => free memory.
1008                  * We need to unlock here, because riemann_free() will lock.
1009                  * This is not a race condition, because we're the only one
1010                  * holding a reference. */
1011                 pthread_mutex_unlock (&host->lock);
1012                 riemann_free (host);
1013                 return (-1);
1014         }
1015
1016         host->reference_count--;
1017         pthread_mutex_unlock (&host->lock);
1018
1019         return status;
1020 } /* }}} int riemann_config_node */
1021
1022 static int riemann_config(oconfig_item_t *ci) /* {{{ */
1023 {
1024         int              i;
1025         oconfig_item_t  *child;
1026         int              status;
1027
1028         for (i = 0; i < ci->children_num; i++)  {
1029                 child = &ci->children[i];
1030
1031                 if (strcasecmp("Node", child->key) == 0) {
1032                         riemann_config_node (child);
1033                 } else if (strcasecmp(child->key, "attribute") == 0) {
1034                         char *key = NULL;
1035                         char *val = NULL;
1036
1037                         if (child->values_num != 2) {
1038                                 WARNING("riemann attributes need both a key and a value.");
1039                                 return (-1);
1040                         }
1041                         if (child->values[0].type != OCONFIG_TYPE_STRING ||
1042                             child->values[1].type != OCONFIG_TYPE_STRING) {
1043                                 WARNING("riemann attribute needs string arguments.");
1044                                 return (-1);
1045                         }
1046                         if ((key = strdup(child->values[0].value.string)) == NULL) {
1047                                 WARNING("cannot allocate memory for attribute key.");
1048                                 return (-1);
1049                         }
1050                         if ((val = strdup(child->values[1].value.string)) == NULL) {
1051                                 WARNING("cannot allocate memory for attribute value.");
1052                                 sfree (key);
1053                                 return (-1);
1054                         }
1055                         strarray_add(&riemann_attrs, &riemann_attrs_num, key);
1056                         strarray_add(&riemann_attrs, &riemann_attrs_num, val);
1057                         DEBUG("write_riemann: got attr: %s => %s", key, val);
1058                         sfree(key);
1059                         sfree(val);
1060                 } else if (strcasecmp(child->key, "tag") == 0) {
1061                         char *tmp = NULL;
1062                         status = cf_util_get_string(child, &tmp);
1063                         if (status != 0)
1064                                 continue;
1065
1066                         strarray_add (&riemann_tags, &riemann_tags_num, tmp);
1067                         DEBUG("write_riemann plugin: Got tag: %s", tmp);
1068                         sfree (tmp);
1069                 } else {
1070                         WARNING ("write_riemann plugin: Ignoring unknown "
1071                                  "configuration option \"%s\" at top level.",
1072                                  child->key);
1073                 }
1074         }
1075         return (0);
1076 } /* }}} int riemann_config */
1077
1078 void module_register(void)
1079 {
1080         plugin_register_complex_config ("write_riemann", riemann_config);
1081 }
1082
1083 /* vim: set sw=8 sts=8 ts=8 noet : */