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