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 #define RIEMANN_BATCH_MAX      8192
  47
  48 int write_riemann_threshold_check(const data_set_t *, const value_list_t *, int *);
  49
  50 struct riemann_host {
  51         char                    *name;
  52         char                    *event_service_prefix;
  53 #define F_CONNECT        0x01
  54         uint8_t                  flags;
  55         pthread_mutex_t  lock;
  56     _Bool            batch_mode;
  57         _Bool            notifications;
  58         _Bool            check_thresholds;
  59         _Bool                    store_rates;
  60         _Bool                    always_append_ds;
  61         char                    *node;
  62         char                    *service;
  63         _Bool                    use_tcp;
  64         int                          s;
  65         double                   ttl_factor;
  66     Msg             *batch_msg;
  67     cdtime_t         batch_init;
  68     int              batch_max;
  69         int                          reference_count;
  70 };
  71
  72 static char     **riemann_tags;
  73 static size_t     riemann_tags_num;
  74 static char     **riemann_attrs;
  75 static size_t     riemann_attrs_num;
  76
  77 static void riemann_event_protobuf_free (Event *event) /* {{{ */
  78 {
  79         size_t i;
  80
  81         if (event == NULL)
  82                 return;
  83
  84         sfree (event->state);
  85         sfree (event->service);
  86         sfree (event->host);
  87         sfree (event->description);
  88
  89         strarray_free (event->tags, event->n_tags);
  90         event->tags = NULL;
  91         event->n_tags = 0;
  92
  93         for (i = 0; i < event->n_attributes; i++)
  94         {
  95                 sfree (event->attributes[i]->key);
  96                 sfree (event->attributes[i]->value);
  97                 sfree (event->attributes[i]);
  98         }
  99         sfree (event->attributes);
 100         event->n_attributes = 0;
 101
 102         sfree (event);
 103 } /* }}} void riemann_event_protobuf_free */
 104
 105 static void riemann_msg_protobuf_free(Msg *msg) /* {{{ */
 106 {
 107         size_t i;
 108
 109         if (msg == NULL)
 110                 return;
 111
 112         for (i = 0; i < msg->n_events; i++)
 113         {
 114                 riemann_event_protobuf_free (msg->events[i]);
 115                 msg->events[i] = NULL;
 116         }
 117
 118         sfree (msg->events);
 119         msg->n_events = 0;
 120
 121         sfree (msg);
 122 } /* }}} void riemann_msg_protobuf_free */
 123
 124 /* host->lock must be held when calling this function. */
 125 static int riemann_connect(struct riemann_host *host) /* {{{ */
 126 {
 127         int                      e;
 128         struct addrinfo         *ai, *res, hints;
 129         char const              *node;
 130         char const              *service;
 131
 132         if (host->flags & F_CONNECT)
 133                 return 0;
 134
 135         memset(&hints, 0, sizeof(hints));
 136         memset(&service, 0, sizeof(service));
 137         hints.ai_family = AF_UNSPEC;
 138         hints.ai_socktype = host->use_tcp ? SOCK_STREAM : SOCK_DGRAM;
 139 #ifdef AI_ADDRCONFIG
 140         hints.ai_flags |= AI_ADDRCONFIG;
 141 #endif
 142
 143         node = (host->node != NULL) ? host->node : RIEMANN_HOST;
 144         service = (host->service != NULL) ? host->service : RIEMANN_PORT;
 145
 146         if ((e = getaddrinfo(node, service, &hints, &res)) != 0) {
 147                 ERROR ("write_riemann plugin: Unable to resolve host \"%s\": %s",
 148                         node, gai_strerror(e));
 149                 return -1;
 150         }
 151
 152         host->s = -1;
 153         for (ai = res; ai != NULL; ai = ai->ai_next) {
 154                 if ((host->s = socket(ai->ai_family,
 155                                       ai->ai_socktype,
 156                                       ai->ai_protocol)) == -1) {
 157                         continue;
 158                 }
 159
 160                 if (connect(host->s, ai->ai_addr, ai->ai_addrlen) != 0) {
 161                         close(host->s);
 162                         host->s = -1;
 163                         continue;
 164                 }
 165
 166                 host->flags |= F_CONNECT;
 167                 DEBUG("write_riemann plugin: got a successful connection for: %s:%s",
 168                                 node, service);
 169                 break;
 170         }
 171
 172         freeaddrinfo(res);
 173
 174         if (host->s < 0) {
 175                 WARNING("write_riemann plugin: Unable to connect to Riemann at %s:%s",
 176                                 node, service);
 177                 return -1;
 178         }
 179         return 0;
 180 } /* }}} int riemann_connect */
 181
 182 /* host->lock must be held when calling this function. */
 183 static int riemann_disconnect (struct riemann_host *host) /* {{{ */
 184 {
 185         if ((host->flags & F_CONNECT) == 0)
 186                 return (0);
 187
 188         close (host->s);
 189         host->s = -1;
 190         host->flags &= ~F_CONNECT;
 191
 192         return (0);
 193 } /* }}} int riemann_disconnect */
 194
 195 static int riemann_send_msg (struct riemann_host *host, const Msg *msg) /* {{{ */
 196 {
 197         int status = 0;
 198         u_char *buffer = NULL;
 199         size_t  buffer_len;
 200
 201         status = riemann_connect (host);
 202         if (status != 0)
 203                 return status;
 204
 205         buffer_len = msg__get_packed_size(msg);
 206
 207         if (host->use_tcp)
 208                 buffer_len += 4;
 209
 210         buffer = malloc (buffer_len);
 211         if (buffer == NULL) {
 212                 ERROR ("write_riemann plugin: malloc failed.");
 213                 return ENOMEM;
 214         }
 215         memset (buffer, 0, buffer_len);
 216
 217         if (host->use_tcp)
 218         {
 219                 uint32_t length = htonl ((uint32_t) (buffer_len - 4));
 220                 memcpy (buffer, &length, 4);
 221                 msg__pack(msg, buffer + 4);
 222         }
 223         else
 224         {
 225                 msg__pack(msg, buffer);
 226         }
 227
 228         status = (int) swrite (host->s, buffer, buffer_len);
 229         if (status != 0)
 230         {
 231                 char errbuf[1024];
 232                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s failed: %s",
 233                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 234                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 235                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 236                 sfree (buffer);
 237                 return -1;
 238         }
 239
 240         sfree (buffer);
 241         return 0;
 242 } /* }}} int riemann_send_msg */
 243
 244 static int riemann_recv_ack(struct riemann_host *host) /* {{{ */
 245 {
 246         int status = 0;
 247         Msg *msg = NULL;
 248         uint32_t header;
 249
 250         status = (int) sread (host->s, &header, 4);
 251
 252         if (status != 0)
 253                 return -1;
 254
 255         size_t size = ntohl(header);
 256
 257         // Buffer on the stack since acknowledges are typically small.
 258         u_char buffer[size];
 259         memset (buffer, 0, size);
 260
 261         status = (int) sread (host->s, buffer, size);
 262
 263         if (status != 0)
 264                 return status;
 265
 266         msg = msg__unpack (NULL, size, buffer);
 267
 268         if (msg == NULL)
 269                 return -1;
 270
 271         if (!msg->ok)
 272         {
 273                 ERROR ("write_riemann plugin: Sending to Riemann at %s:%s acknowledgement message reported error: %s",
 274                                 (host->node != NULL) ? host->node : RIEMANN_HOST,
 275                                 (host->service != NULL) ? host->service : RIEMANN_PORT,
 276                                 msg->error);
 277
 278                 msg__free_unpacked(msg, NULL);
 279                 return -1;
 280         }
 281
 282         msg__free_unpacked (msg, NULL);
 283         return 0;
 284 } /* }}} int riemann_recv_ack */
 285
 286 /**
 287  * Function to send messages (Msg) to riemann.
 288  *
 289  * Acquires the host lock, disconnects on errors.
 290  */
 291 static int riemann_send(struct riemann_host *host, Msg const *msg) /* {{{ */
 292 {
 293         int status = 0;
 294         pthread_mutex_lock (&host->lock);
 295
 296         status = riemann_send_msg(host, msg);
 297         if (status != 0) {
 298                 riemann_disconnect (host);
 299                 pthread_mutex_unlock (&host->lock);
 300                 return status;
 301         }
 302
 303         /*
 304          * For TCP we need to receive message acknowledgemenent.
 305          */
 306         if (host->use_tcp)
 307         {
 308                 status = riemann_recv_ack(host);
 309
 310                 if (status != 0)
 311                 {
 312                         riemann_disconnect (host);
 313                         pthread_mutex_unlock (&host->lock);
 314                         return status;
 315                 }
 316         }
 317
 318         pthread_mutex_unlock (&host->lock);
 319         return 0;
 320 } /* }}} int riemann_send */
 321
 322 static int riemann_event_add_tag (Event *event, char const *tag) /* {{{ */
 323 {
 324         return (strarray_add (&event->tags, &event->n_tags, tag));
 325 } /* }}} int riemann_event_add_tag */
 326
 327 static int riemann_event_add_attribute(Event *event, /* {{{ */
 328                 char const *key, char const *value)
 329 {
 330         Attribute **new_attributes;
 331         Attribute *a;
 332
 333         new_attributes = realloc (event->attributes,
 334                         sizeof (*event->attributes) * (event->n_attributes + 1));
 335         if (new_attributes == NULL)
 336         {
 337                 ERROR ("write_riemann plugin: realloc failed.");
 338                 return (ENOMEM);
 339         }
 340         event->attributes = new_attributes;
 341
 342         a = malloc (sizeof (*a));
 343         if (a == NULL)
 344         {
 345                 ERROR ("write_riemann plugin: malloc failed.");
 346                 return (ENOMEM);
 347         }
 348         attribute__init (a);
 349
 350         a->key = strdup (key);
 351         if (value != NULL)
 352                 a->value = strdup (value);
 353
 354         event->attributes[event->n_attributes] = a;
 355         event->n_attributes++;
 356
 357         return (0);
 358 } /* }}} int riemann_event_add_attribute */
 359
 360 static Msg *riemann_notification_to_protobuf(struct riemann_host *host, /* {{{ */
 361                 notification_t const *n)
 362 {
 363         Msg *msg;
 364         Event *event;
 365         char service_buffer[6 * DATA_MAX_NAME_LEN];
 366         char const *severity;
 367         notification_meta_t *meta;
 368         size_t i;
 369
 370         msg = malloc (sizeof (*msg));
 371         if (msg == NULL)
 372         {
 373                 ERROR ("write_riemann plugin: malloc failed.");
 374                 return (NULL);
 375         }
 376         memset (msg, 0, sizeof (*msg));
 377         msg__init (msg);
 378
 379         msg->events = malloc (sizeof (*msg->events));
 380         if (msg->events == NULL)
 381         {
 382                 ERROR ("write_riemann plugin: malloc failed.");
 383                 sfree (msg);
 384                 return (NULL);
 385         }
 386
 387         event = malloc (sizeof (*event));
 388         if (event == NULL)
 389         {
 390                 ERROR ("write_riemann plugin: malloc failed.");
 391                 sfree (msg->events);
 392                 sfree (msg);
 393                 return (NULL);
 394         }
 395         memset (event, 0, sizeof (*event));
 396         event__init (event);
 397
 398         msg->events[0] = event;
 399         msg->n_events = 1;
 400
 401         event->host = strdup (n->host);
 402         event->time = CDTIME_T_TO_TIME_T (n->time);
 403         event->has_time = 1;
 404
 405         switch (n->severity)
 406         {
 407                 case NOTIF_OKAY:        severity = "ok"; break;
 408                 case NOTIF_WARNING:     severity = "warning"; break;
 409                 case NOTIF_FAILURE:     severity = "critical"; break;
 410                 default:                severity = "unknown";
 411         }
 412         event->state = strdup (severity);
 413
 414         riemann_event_add_tag (event, "notification");
 415         if (n->host[0] != 0)
 416                 riemann_event_add_attribute (event, "host", n->host);
 417         if (n->plugin[0] != 0)
 418                 riemann_event_add_attribute (event, "plugin", n->plugin);
 419         if (n->plugin_instance[0] != 0)
 420                 riemann_event_add_attribute (event, "plugin_instance",
 421                                 n->plugin_instance);
 422
 423         if (n->type[0] != 0)
 424                 riemann_event_add_attribute (event, "type", n->type);
 425         if (n->type_instance[0] != 0)
 426                 riemann_event_add_attribute (event, "type_instance",
 427                                 n->type_instance);
 428
 429         for (i = 0; i < riemann_attrs_num; i += 2)
 430                 riemann_event_add_attribute(event,
 431                                             riemann_attrs[i],
 432                                             riemann_attrs[i +1]);
 433
 434         for (i = 0; i < riemann_tags_num; i++)
 435                 riemann_event_add_tag (event, riemann_tags[i]);
 436
 437         format_name (service_buffer, sizeof (service_buffer),
 438                         /* host = */ "", n->plugin, n->plugin_instance,
 439                         n->type, n->type_instance);
 440         event->service = strdup (&service_buffer[1]);
 441
 442         if (n->message[0] != 0)
 443                 riemann_event_add_attribute (event, "description", n->message);
 444
 445         /* Pull in values from threshold and add extra attributes */
 446         for (meta = n->meta; meta != NULL; meta = meta->next)
 447         {
 448                 if (strcasecmp ("CurrentValue", meta->name) == 0 && meta->type == NM_TYPE_DOUBLE)
 449                 {
 450                         event->metric_d = meta->nm_value.nm_double;
 451                         event->has_metric_d = 1;
 452                         continue;
 453                 }
 454
 455                 if (meta->type == NM_TYPE_STRING) {
 456                         riemann_event_add_attribute (event, meta->name, meta->nm_value.nm_string);
 457                         continue;
 458                 }
 459         }
 460
 461         DEBUG ("write_riemann plugin: Successfully created protobuf for notification: "
 462                         "host = \"%s\", service = \"%s\", state = \"%s\"",
 463                         event->host, event->service, event->state);
 464         return (msg);
 465 } /* }}} Msg *riemann_notification_to_protobuf */
 466
 467 static Event *riemann_value_to_protobuf(struct riemann_host const *host, /* {{{ */
 468                 data_set_t const *ds,
 469                 value_list_t const *vl, size_t index,
 470                                          gauge_t const *rates,
 471                                          int status)
 472 {
 473         Event *event;
 474         char name_buffer[5 * DATA_MAX_NAME_LEN];
 475         char service_buffer[6 * DATA_MAX_NAME_LEN];
 476         double ttl;
 477         size_t i;
 478
 479         event = malloc (sizeof (*event));
 480         if (event == NULL)
 481         {
 482                 ERROR ("write_riemann plugin: malloc failed.");
 483                 return (NULL);
 484         }
 485         memset (event, 0, sizeof (*event));
 486         event__init (event);
 487
 488         event->host = strdup (vl->host);
 489         event->time = CDTIME_T_TO_TIME_T (vl->time);
 490         event->has_time = 1;
 491
 492         if (host->check_thresholds) {
 493                 switch (status) {
 494                         case STATE_OKAY:
 495                                 event->state = strdup("ok");
 496                                 break;
 497                         case STATE_ERROR:
 498                                 event->state = strdup("critical");
 499                                 break;
 500                         case STATE_WARNING:
 501                                 event->state = strdup("warning");
 502                                 break;
 503                         case STATE_MISSING:
 504                                 event->state = strdup("unknown");
 505                                 break;
 506                 }
 507         }
 508
 509         ttl = CDTIME_T_TO_DOUBLE (vl->interval) * host->ttl_factor;
 510         event->ttl = (float) ttl;
 511         event->has_ttl = 1;
 512
 513         riemann_event_add_attribute (event, "plugin", vl->plugin);
 514         if (vl->plugin_instance[0] != 0)
 515                 riemann_event_add_attribute (event, "plugin_instance",
 516                                 vl->plugin_instance);
 517
 518         riemann_event_add_attribute (event, "type", vl->type);
 519         if (vl->type_instance[0] != 0)
 520                 riemann_event_add_attribute (event, "type_instance",
 521                                 vl->type_instance);
 522
 523         if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL))
 524         {
 525                 char ds_type[DATA_MAX_NAME_LEN];
 526
 527                 ssnprintf (ds_type, sizeof (ds_type), "%s:rate",
 528                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 529                 riemann_event_add_attribute (event, "ds_type", ds_type);
 530         }
 531         else
 532         {
 533                 riemann_event_add_attribute (event, "ds_type",
 534                                 DS_TYPE_TO_STRING(ds->ds[index].type));
 535         }
 536         riemann_event_add_attribute (event, "ds_name", ds->ds[index].name);
 537         {
 538                 char ds_index[DATA_MAX_NAME_LEN];
 539
 540                 ssnprintf (ds_index, sizeof (ds_index), "%zu", index);
 541                 riemann_event_add_attribute (event, "ds_index", ds_index);
 542         }
 543
 544         for (i = 0; i < riemann_attrs_num; i += 2)
 545                 riemann_event_add_attribute(event,
 546                                             riemann_attrs[i],
 547                                             riemann_attrs[i +1]);
 548
 549         for (i = 0; i < riemann_tags_num; i++)
 550                 riemann_event_add_tag (event, riemann_tags[i]);
 551
 552         if (ds->ds[index].type == DS_TYPE_GAUGE)
 553         {
 554                 event->has_metric_d = 1;
 555                 event->metric_d = (double) vl->values[index].gauge;
 556         }
 557         else if (rates != NULL)
 558         {
 559                 event->has_metric_d = 1;
 560                 event->metric_d = (double) rates[index];
 561         }
 562         else
 563         {
 564                 event->has_metric_sint64 = 1;
 565                 if (ds->ds[index].type == DS_TYPE_DERIVE)
 566                         event->metric_sint64 = (int64_t) vl->values[index].derive;
 567                 else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
 568                         event->metric_sint64 = (int64_t) vl->values[index].absolute;
 569                 else
 570                         event->metric_sint64 = (int64_t) vl->values[index].counter;
 571         }
 572
 573         format_name (name_buffer, sizeof (name_buffer),
 574                         /* host = */ "", vl->plugin, vl->plugin_instance,
 575                         vl->type, vl->type_instance);
 576         if (host->always_append_ds || (ds->ds_num > 1))
 577         {
 578                 if (host->event_service_prefix == NULL)
 579                         ssnprintf (service_buffer, sizeof (service_buffer), "%s/%s",
 580                                         &name_buffer[1], ds->ds[index].name);
 581                 else
 582                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s/%s",
 583                                         host->event_service_prefix, &name_buffer[1], ds->ds[index].name);
 584         }
 585         else
 586         {
 587                 if (host->event_service_prefix == NULL)
 588                         sstrncpy (service_buffer, &name_buffer[1], sizeof (service_buffer));
 589                 else
 590                         ssnprintf (service_buffer, sizeof (service_buffer), "%s%s",
 591                                         host->event_service_prefix, &name_buffer[1]);
 592         }
 593
 594         event->service = strdup (service_buffer);
 595
 596         DEBUG ("write_riemann plugin: Successfully created protobuf for metric: "
 597                         "host = \"%s\", service = \"%s\"",
 598                         event->host, event->service);
 599         return (event);
 600 } /* }}} Event *riemann_value_to_protobuf */
 601
 602 static Msg *riemann_value_list_to_protobuf (struct riemann_host const *host, /* {{{ */
 603                                             data_set_t const *ds,
 604                                             value_list_t const *vl,
 605                                             int *statuses)
 606 {
 607         Msg *msg;
 608         size_t i;
 609         gauge_t *rates = NULL;
 610
 611         /* Initialize the Msg structure. */
 612         msg = malloc (sizeof (*msg));
 613         if (msg == NULL)
 614         {
 615                 ERROR ("write_riemann plugin: malloc failed.");
 616                 return (NULL);
 617         }
 618         memset (msg, 0, sizeof (*msg));
 619         msg__init (msg);
 620
 621         /* Set up events. First, the list of pointers. */
 622         msg->n_events = vl->values_len;
 623         msg->events = calloc (msg->n_events, sizeof (*msg->events));
 624         if (msg->events == NULL)
 625         {
 626                 ERROR ("write_riemann plugin: calloc failed.");
 627                 riemann_msg_protobuf_free (msg);
 628                 return (NULL);
 629         }
 630
 631         if (host->store_rates)
 632         {
 633                 rates = uc_get_rate (ds, vl);
 634                 if (rates == NULL)
 635                 {
 636                         ERROR ("write_riemann plugin: uc_get_rate failed.");
 637                         riemann_msg_protobuf_free (msg);
 638                         return (NULL);
 639                 }
 640         }
 641
 642         for (i = 0; i < msg->n_events; i++)
 643         {
 644                 msg->events[i] = riemann_value_to_protobuf (host, ds, vl,
 645                                                             (int) i, rates, statuses[i]);
 646                 if (msg->events[i] == NULL)
 647                 {
 648                         riemann_msg_protobuf_free (msg);
 649                         sfree (rates);
 650                         return (NULL);
 651                 }
 652         }
 653
 654         sfree (rates);
 655         return (msg);
 656 } /* }}} Msg *riemann_value_list_to_protobuf */
 657
 658
 659 /*
 660  * Always call while holding host->lock !
 661  */
 662 static int riemann_batch_flush_nolock (cdtime_t timeout,
 663                                        struct riemann_host *host)
 664 {
 665     cdtime_t    now;
 666     int         status = 0;
 667
 668     if (timeout > 0) {
 669         now = cdtime ();
 670         if ((host->batch_init + timeout) > now)
 671             return status;
 672     }
 673     riemann_send_msg(host, host->batch_msg);
 674     riemann_msg_protobuf_free(host->batch_msg);
 675
 676         if (host->use_tcp && ((status = riemann_recv_ack(host)) != 0))
 677         riemann_disconnect (host);
 678
 679     host->batch_init = cdtime();
 680     host->batch_msg = NULL;
 681     return status;
 682 }
 683
 684 static int riemann_batch_flush (cdtime_t timeout,
 685         const char *identifier __attribute__((unused)),
 686         user_data_t *user_data)
 687 {
 688     struct riemann_host *host;
 689     int status;
 690
 691     if (user_data == NULL)
 692         return (-EINVAL);
 693
 694     host = user_data->data;
 695     pthread_mutex_lock (&host->lock);
 696     status = riemann_batch_flush_nolock (timeout, host);
 697     if (status != 0)
 698         ERROR ("write_riemann plugin: riemann_send failed with status %i",
 699                status);
 700
 701     pthread_mutex_unlock(&host->lock);
 702     return status;
 703 }
 704
 705 static int riemann_batch_add_value_list (struct riemann_host *host, /* {{{ */
 706                                          data_set_t const *ds,
 707                                          value_list_t const *vl,
 708                                          int *statuses)
 709 {
 710         size_t i;
 711     Event **events;
 712     Msg *msg;
 713     size_t len;
 714     int ret;
 715
 716     msg = riemann_value_list_to_protobuf (host, ds, vl, statuses);
 717     if (msg == NULL)
 718         return -1;
 719
 720     pthread_mutex_lock(&host->lock);
 721
 722     if (host->batch_msg == NULL) {
 723         host->batch_msg = msg;
 724     } else {
 725         len = msg->n_events + host->batch_msg->n_events;
 726         events = realloc(host->batch_msg->events,
 727                          (len * sizeof(*host->batch_msg->events)));
 728         if (events == NULL) {
 729             pthread_mutex_unlock(&host->lock);
 730             ERROR ("write_riemann plugin: out of memory");
 731             riemann_msg_protobuf_free (msg);
 732             return -1;
 733         }
 734         host->batch_msg->events = events;
 735
 736         for (i = host->batch_msg->n_events; i < len; i++)
 737             host->batch_msg->events[i] = msg->events[i - host->batch_msg->n_events];
 738
 739         host->batch_msg->n_events = len;
 740         sfree (msg->events);
 741         msg->n_events = 0;
 742         sfree (msg);
 743     }
 744
 745         len = msg__get_packed_size(host->batch_msg);
 746     ret = 0;
 747     if ((host->batch_max < 0) || (((size_t) host->batch_max) <= len)) {
 748             ret = riemann_batch_flush_nolock(0, host);
 749     }
 750
 751     pthread_mutex_unlock(&host->lock);
 752     return ret;
 753 } /* }}} Msg *riemann_batch_add_value_list */
 754
 755 static int riemann_notification(const notification_t *n, user_data_t *ud) /* {{{ */
 756 {
 757         int                      status;
 758         struct riemann_host     *host = ud->data;
 759         Msg                     *msg;
 760
 761         if (!host->notifications)
 762                 return 0;
 763
 764     /*
 765      * Never batch for notifications, send them ASAP
 766      */
 767         msg = riemann_notification_to_protobuf (host, n);
 768         if (msg == NULL)
 769                 return (-1);
 770
 771         status = riemann_send (host, msg);
 772         if (status != 0)
 773                 ERROR ("write_riemann plugin: riemann_send failed with status %i",
 774                                 status);
 775
 776         riemann_msg_protobuf_free (msg);
 777         return (status);
 778 } /* }}} int riemann_notification */
 779
 780 static int riemann_write(const data_set_t *ds, /* {{{ */
 781                 const value_list_t *vl,
 782                 user_data_t *ud)
 783 {
 784         int                      status = 0;
 785         int                      statuses[vl->values_len];
 786         struct riemann_host     *host = ud->data;
 787
 788         if (host->check_thresholds) {
 789                 status = write_riemann_threshold_check(ds, vl, statuses);
 790                 if (status != 0)
 791                         return status;
 792         } else {
 793                 memset (statuses, 0, sizeof (statuses));
 794         }
 795
 796         if (host->use_tcp == 1 && host->batch_mode) {
 797                 riemann_batch_add_value_list (host, ds, vl, statuses);
 798         } else {
 799                 Msg *msg = riemann_value_list_to_protobuf (host, ds, vl, statuses);
 800                 if (msg == NULL)
 801                         return (-1);
 802
 803                 status = riemann_send (host, msg);
 804                 if (status != 0)
 805                         ERROR ("write_riemann plugin: riemann_send failed with status %i", status);
 806
 807                 riemann_msg_protobuf_free (msg);
 808         }
 809
 810         return status;
 811 } /* }}} int riemann_write */
 812
 813 static void riemann_free(void *p) /* {{{ */
 814 {
 815         struct riemann_host     *host = p;
 816
 817         if (host == NULL)
 818                 return;
 819
 820         pthread_mutex_lock (&host->lock);
 821
 822         host->reference_count--;
 823         if (host->reference_count > 0)
 824         {
 825                 pthread_mutex_unlock (&host->lock);
 826                 return;
 827         }
 828
 829         riemann_disconnect (host);
 830
 831         sfree(host->service);
 832         pthread_mutex_destroy (&host->lock);
 833         sfree(host);
 834 } /* }}} void riemann_free */
 835
 836 static int riemann_config_node(oconfig_item_t *ci) /* {{{ */
 837 {
 838         struct riemann_host     *host = NULL;
 839         int                      status = 0;
 840         int                      i;
 841         oconfig_item_t          *child;
 842         char                     callback_name[DATA_MAX_NAME_LEN];
 843         user_data_t              ud;
 844
 845         if ((host = calloc(1, sizeof (*host))) == NULL) {
 846                 ERROR ("write_riemann plugin: calloc failed.");
 847                 return ENOMEM;
 848         }
 849         pthread_mutex_init (&host->lock, NULL);
 850         host->reference_count = 1;
 851         host->node = NULL;
 852         host->service = NULL;
 853         host->notifications = 1;
 854         host->check_thresholds = 0;
 855         host->store_rates = 1;
 856         host->always_append_ds = 0;
 857         host->use_tcp = 1;
 858         host->batch_mode = 1;
 859         host->batch_max = RIEMANN_BATCH_MAX; /* typical MSS */
 860         host->batch_init = cdtime();
 861         host->ttl_factor = RIEMANN_TTL_FACTOR;
 862
 863         status = cf_util_get_string (ci, &host->name);
 864         if (status != 0) {
 865                 WARNING("write_riemann plugin: Required host name is missing.");
 866                 riemann_free (host);
 867                 return -1;
 868         }
 869
 870         for (i = 0; i < ci->children_num; i++) {
 871                 /*
 872                  * The code here could be simplified but makes room
 873                  * for easy adding of new options later on.
 874                  */
 875                 child = &ci->children[i];
 876                 status = 0;
 877
 878                 if (strcasecmp ("Host", child->key) == 0) {
 879                         status = cf_util_get_string (child, &host->node);
 880                         if (status != 0)
 881                                 break;
 882                 } else if (strcasecmp ("Notifications", child->key) == 0) {
 883                         status = cf_util_get_boolean(child, &host->notifications);
 884                         if (status != 0)
 885                                 break;
 886                 } else if (strcasecmp ("EventServicePrefix", child->key) == 0) {
 887                         status = cf_util_get_string (child, &host->event_service_prefix);
 888                         if (status != 0)
 889                                 break;
 890                 } else if (strcasecmp ("CheckThresholds", child->key) == 0) {
 891                         status = cf_util_get_boolean(child, &host->check_thresholds);
 892                         if (status != 0)
 893                                 break;
 894         } else if (strcasecmp ("Batch", child->key) == 0) {
 895             status = cf_util_get_boolean(child, &host->batch_mode);
 896             if (status != 0)
 897                 break;
 898         } else if (strcasecmp("BatchMaxSize", child->key) == 0) {
 899             status = cf_util_get_int(child, &host->batch_max);
 900             if (status != 0)
 901                 break;
 902                 } else if (strcasecmp ("Port", child->key) == 0) {
 903                         status = cf_util_get_service (child, &host->service);
 904                         if (status != 0) {
 905                                 ERROR ("write_riemann plugin: Invalid argument "
 906                                                 "configured for the \"Port\" "
 907                                                 "option.");
 908                                 break;
 909                         }
 910                 } else if (strcasecmp ("Protocol", child->key) == 0) {
 911                         char tmp[16];
 912                         status = cf_util_get_string_buffer (child,
 913                                         tmp, sizeof (tmp));
 914                         if (status != 0)
 915                         {
 916                                 ERROR ("write_riemann plugin: cf_util_get_"
 917                                                 "string_buffer failed with "
 918                                                 "status %i.", status);
 919                                 break;
 920                         }
 921
 922                         if (strcasecmp ("UDP", tmp) == 0)
 923                                 host->use_tcp = 0;
 924                         else if (strcasecmp ("TCP", tmp) == 0)
 925                                 host->use_tcp = 1;
 926                         else
 927                                 WARNING ("write_riemann plugin: The value "
 928                                                 "\"%s\" is not valid for the "
 929                                                 "\"Protocol\" option. Use "
 930                                                 "either \"UDP\" or \"TCP\".",
 931                                                 tmp);
 932                 } else if (strcasecmp ("StoreRates", child->key) == 0) {
 933                         status = cf_util_get_boolean (child, &host->store_rates);
 934                         if (status != 0)
 935                                 break;
 936                 } else if (strcasecmp ("AlwaysAppendDS", child->key) == 0) {
 937                         status = cf_util_get_boolean (child,
 938                                         &host->always_append_ds);
 939                         if (status != 0)
 940                                 break;
 941                 } else if (strcasecmp ("TTLFactor", child->key) == 0) {
 942                         double tmp = NAN;
 943                         status = cf_util_get_double (child, &tmp);
 944                         if (status != 0)
 945                                 break;
 946                         if (tmp >= 2.0) {
 947                                 host->ttl_factor = tmp;
 948                         } else if (tmp >= 1.0) {
 949                                 NOTICE ("write_riemann plugin: The configured "
 950                                                 "TTLFactor is very small "
 951                                                 "(%.1f). A value of 2.0 or "
 952                                                 "greater is recommended.",
 953                                                 tmp);
 954                                 host->ttl_factor = tmp;
 955                         } else if (tmp > 0.0) {
 956                                 WARNING ("write_riemann plugin: The configured "
 957                                                 "TTLFactor is too small to be "
 958                                                 "useful (%.1f). I'll use it "
 959                                                 "since the user knows best, "
 960                                                 "but under protest.",
 961                                                 tmp);
 962                                 host->ttl_factor = tmp;
 963                         } else { /* zero, negative and NAN */
 964                                 ERROR ("write_riemann plugin: The configured "
 965                                                 "TTLFactor is invalid (%.1f).",
 966                                                 tmp);
 967                         }
 968                 } else {
 969                         WARNING("write_riemann plugin: ignoring unknown config "
 970                                 "option: \"%s\"", child->key);
 971                 }
 972         }
 973         if (status != 0) {
 974                 riemann_free (host);
 975                 return status;
 976         }
 977
 978         ssnprintf (callback_name, sizeof (callback_name), "write_riemann/%s",
 979                         host->name);
 980         ud.data = host;
 981         ud.free_func = riemann_free;
 982
 983         pthread_mutex_lock (&host->lock);
 984
 985         status = plugin_register_write (callback_name, riemann_write, &ud);
 986
 987     if (host->use_tcp == 1 && host->batch_mode) {
 988         ud.free_func = NULL;
 989         plugin_register_flush(callback_name, riemann_batch_flush, &ud);
 990     }
 991         if (status != 0)
 992                 WARNING ("write_riemann plugin: plugin_register_write (\"%s\") "
 993                                 "failed with status %i.",
 994                                 callback_name, status);
 995         else /* success */
 996                 host->reference_count++;
 997
 998         status = plugin_register_notification (callback_name,
 999                         riemann_notification, &ud);
1000         if (status != 0)
1001                 WARNING ("write_riemann plugin: plugin_register_notification (\"%s\") "
1002                                 "failed with status %i.",
1003                                 callback_name, status);
1004         else /* success */
1005                 host->reference_count++;
1006
1007         if (host->reference_count <= 1)
1008         {
1009                 /* Both callbacks failed => free memory.
1010                  * We need to unlock here, because riemann_free() will lock.
1011                  * This is not a race condition, because we're the only one
1012                  * holding a reference. */
1013                 pthread_mutex_unlock (&host->lock);
1014                 riemann_free (host);
1015                 return (-1);
1016         }
1017
1018         host->reference_count--;
1019         pthread_mutex_unlock (&host->lock);
1020
1021         return status;
1022 } /* }}} int riemann_config_node */
1023
1024 static int riemann_config(oconfig_item_t *ci) /* {{{ */
1025 {
1026         int              i;
1027         oconfig_item_t  *child;
1028         int              status;
1029
1030         for (i = 0; i < ci->children_num; i++)  {
1031                 child = &ci->children[i];
1032
1033                 if (strcasecmp("Node", child->key) == 0) {
1034                         riemann_config_node (child);
1035                 } else if (strcasecmp(child->key, "attribute") == 0) {
1036                         char *key = NULL;
1037                         char *val = NULL;
1038
1039                         if (child->values_num != 2) {
1040                                 WARNING("riemann attributes need both a key and a value.");
1041                                 return (-1);
1042                         }
1043                         if (child->values[0].type != OCONFIG_TYPE_STRING ||
1044                             child->values[1].type != OCONFIG_TYPE_STRING) {
1045                                 WARNING("riemann attribute needs string arguments.");
1046                                 return (-1);
1047                         }
1048                         if ((key = strdup(child->values[0].value.string)) == NULL) {
1049                                 WARNING("cannot allocate memory for attribute key.");
1050                                 return (-1);
1051                         }
1052                         if ((val = strdup(child->values[1].value.string)) == NULL) {
1053                                 WARNING("cannot allocate memory for attribute value.");
1054                                 return (-1);
1055                         }
1056                         strarray_add(&riemann_attrs, &riemann_attrs_num, key);
1057                         strarray_add(&riemann_attrs, &riemann_attrs_num, val);
1058                         DEBUG("write_riemann: got attr: %s => %s", key, val);
1059                         sfree(key);
1060                         sfree(val);
1061                 } else if (strcasecmp(child->key, "tag") == 0) {
1062                         char *tmp = NULL;
1063                         status = cf_util_get_string(child, &tmp);
1064                         if (status != 0)
1065                                 continue;
1066
1067                         strarray_add (&riemann_tags, &riemann_tags_num, tmp);
1068                         DEBUG("write_riemann plugin: Got tag: %s", tmp);
1069                         sfree (tmp);
1070                 } else {
1071                         WARNING ("write_riemann plugin: Ignoring unknown "
1072                                  "configuration option \"%s\" at top level.",
1073                                  child->key);
1074                 }
1075         }
1076         return (0);
1077 } /* }}} int riemann_config */
1078
1079 void module_register(void)
1080 {
1081         plugin_register_complex_config ("write_riemann", riemann_config);
1082 }
1083
1084 /* vim: set sw=8 sts=8 ts=8 noet : */