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