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  * Copyright (C) 2015,2016  Gergely Nagy
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *   Pierre-Yves Ritschard <pyr at spootnik.org>
  27  *   Florian octo Forster <octo at collectd.org>
  28  *   Gergely Nagy <algernon at madhouse-project.org>
  29  */
  30
  31 #include <riemann/riemann-client.h>
  32 #include <errno.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 "utils_complain.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     c_complain_t init_complaint;
  50         char                    *name;
  51         char                    *event_service_prefix;
  52         pthread_mutex_t  lock;
  53     _Bool            batch_mode;
  54         _Bool            notifications;
  55         _Bool            check_thresholds;
  56         _Bool                    store_rates;
  57         _Bool                    always_append_ds;
  58         char                    *node;
  59         int                      port;
  60         riemann_client_type_t    client_type;
  61         riemann_client_t        *client;
  62         double                   ttl_factor;
  63     cdtime_t         batch_init;
  64     int              batch_max;
  65     int              batch_timeout;
  66         int                          reference_count;
  67   riemann_message_t     *batch_msg;
  68         char                     *tls_ca_file;
  69         char                     *tls_cert_file;
  70         char                     *tls_key_file;
  71         struct timeval timeout;
  72 };
  73
  74 static char     **riemann_tags;
  75 static size_t     riemann_tags_num;
  76 static char     **riemann_attrs;
  77 static size_t     riemann_attrs_num;
  78
  79 /* host->lock must be held when calling this function. */
  80 static int wrr_connect(struct riemann_host *host) /* {{{ */
  81 {
  82         char const              *node;
  83         int                      port;
  84
  85         if (host->client)
  86                 return 0;
  87
  88         node = (host->node != NULL) ? host->node : RIEMANN_HOST;
  89         port = (host->port) ? host->port : RIEMANN_PORT;
  90
  91         host->client = NULL;
  92
  93         host->client = riemann_client_create(host->client_type, node, port,
  94                                              RIEMANN_CLIENT_OPTION_TLS_CA_FILE, host->tls_ca_file,
  95                                              RIEMANN_CLIENT_OPTION_TLS_CERT_FILE, host->tls_cert_file,
  96                                              RIEMANN_CLIENT_OPTION_TLS_KEY_FILE, host->tls_key_file,
  97                                              RIEMANN_CLIENT_OPTION_NONE);
  98         if (host->client == NULL) {
  99         c_complain (LOG_ERR, &host->init_complaint,
 100                     "write_riemann plugin: Unable to connect to Riemann at %s:%d",
 101                     node, port);
 102                 return -1;
 103         }
 104         if (host->timeout.tv_sec != 0) {
 105                 if (riemann_client_set_timeout(host->client, &host->timeout) != 0) {
 106                         riemann_client_free(host->client);
 107                         host->client = NULL;
 108             c_complain (LOG_ERR, &host->init_complaint,
 109                         "write_riemann plugin: Unable to connect to Riemann at %s:%d",
 110                         node, port);
 111                         return -1;
 112                 }
 113         }
 114
 115     c_release (LOG_INFO, &host->init_complaint,
 116                "write_riemann plugin: Successfully connected to %s:%d",
 117                node, port);
 118
 119         return 0;
 120 } /* }}} int wrr_connect */
 121
 122 /* host->lock must be held when calling this function. */
 123 static int wrr_disconnect(struct riemann_host *host) /* {{{ */
 124 {
 125         if (!host->client)
 126                 return (0);
 127
 128         riemann_client_free(host->client);
 129         host->client = NULL;
 130
 131         return (0);
 132 } /* }}} int wrr_disconnect */
 133
 134 /**
 135  * Function to send messages to riemann.
 136  *
 137  * Acquires the host lock, disconnects on errors.
 138  */
 139 static int wrr_send(struct riemann_host *host, riemann_message_t *msg) /* {{{ */
 140 {
 141         int status = 0;
 142         pthread_mutex_lock (&host->lock);
 143
 144         status = wrr_connect(host);
 145         if (status != 0) {
 146         pthread_mutex_unlock(&host->lock);
 147                 return status;
 148     }
 149
 150         status = riemann_client_send_message(host->client, msg);
 151         if (status != 0) {
 152                 wrr_disconnect(host);
 153                 pthread_mutex_unlock(&host->lock);
 154                 return status;
 155         }
 156
 157         /*
 158          * For TCP we need to receive message acknowledgemenent.
 159          */
 160         if (host->client_type != RIEMANN_CLIENT_UDP)
 161         {
 162                 riemann_message_t *response;
 163
 164                 response = riemann_client_recv_message(host->client);
 165
 166                 if (response == NULL)
 167                 {
 168                         wrr_disconnect(host);
 169                         pthread_mutex_unlock(&host->lock);
 170                         return errno;
 171                 }
 172                 riemann_message_free(response);
 173         }
 174
 175         pthread_mutex_unlock (&host->lock);
 176         return 0;
 177 } /* }}} int wrr_send */
 178
 179 static riemann_message_t *wrr_notification_to_message(struct riemann_host *host, /* {{{ */
 180                 notification_t const *n)
 181 {
 182         riemann_message_t *msg;
 183         riemann_event_t *event;
 184         char service_buffer[6 * DATA_MAX_NAME_LEN];
 185         char const *severity;
 186         notification_meta_t *meta;
 187         size_t i;
 188
 189         switch (n->severity)
 190         {
 191                 case NOTIF_OKAY:        severity = "ok"; break;
 192                 case NOTIF_WARNING:     severity = "warning"; break;
 193                 case NOTIF_FAILURE:     severity = "critical"; break;
 194                 default:                severity = "unknown";
 195         }
 196
 197         format_name(service_buffer, sizeof(service_buffer),
 198                     /* host = */ "", n->plugin, n->plugin_instance,
 199                     n->type, n->type_instance);
 200
 201         event = riemann_event_create(RIEMANN_EVENT_FIELD_HOST, n->host,
 202                                      RIEMANN_EVENT_FIELD_TIME, (int64_t) CDTIME_T_TO_TIME_T(n->time),
 203                                      RIEMANN_EVENT_FIELD_TAGS, "notification", NULL,
 204                                      RIEMANN_EVENT_FIELD_STATE, severity,
 205                                      RIEMANN_EVENT_FIELD_SERVICE, &service_buffer[1],
 206                                      RIEMANN_EVENT_FIELD_NONE);
 207
 208         if (n->host[0] != 0)
 209                 riemann_event_string_attribute_add(event, "host", n->host);
 210         if (n->plugin[0] != 0)
 211                 riemann_event_string_attribute_add(event, "plugin", n->plugin);
 212         if (n->plugin_instance[0] != 0)
 213                 riemann_event_string_attribute_add(event, "plugin_instance", n->plugin_instance);
 214
 215         if (n->type[0] != 0)
 216                 riemann_event_string_attribute_add(event, "type", n->type);
 217         if (n->type_instance[0] != 0)
 218                 riemann_event_string_attribute_add(event, "type_instance", n->type_instance);
 219
 220         for (i = 0; i < riemann_attrs_num; i += 2)
 221                 riemann_event_string_attribute_add(event, riemann_attrs[i], riemann_attrs[i+1]);
 222
 223         for (i = 0; i < riemann_tags_num; i++)
 224                 riemann_event_tag_add(event, riemann_tags[i]);
 225
 226         if (n->message[0] != 0)
 227                 riemann_event_string_attribute_add(event, "description", n->message);
 228
 229         /* Pull in values from threshold and add extra attributes */
 230         for (meta = n->meta; meta != NULL; meta = meta->next)
 231         {
 232                 if (strcasecmp("CurrentValue", meta->name) == 0 && meta->type == NM_TYPE_DOUBLE)
 233                 {
 234                         riemann_event_set(event,
 235                                           RIEMANN_EVENT_FIELD_METRIC_D,
 236                                           (double) meta->nm_value.nm_double,
 237                                           RIEMANN_EVENT_FIELD_NONE);
 238                         continue;
 239                 }
 240
 241                 if (meta->type == NM_TYPE_STRING) {
 242                         riemann_event_string_attribute_add(event, meta->name, meta->nm_value.nm_string);
 243                         continue;
 244                 }
 245         }
 246
 247         msg = riemann_message_create_with_events(event, NULL);
 248         if (msg == NULL)
 249         {
 250                 ERROR("write_riemann plugin: riemann_message_create_with_events() failed.");
 251                 riemann_event_free (event);
 252                 return (NULL);
 253         }
 254
 255         DEBUG("write_riemann plugin: Successfully created message for notification: "
 256               "host = \"%s\", service = \"%s\", state = \"%s\"",
 257               event->host, event->service, event->state);
 258         return (msg);
 259 } /* }}} riemann_message_t *wrr_notification_to_message */
 260
 261 static riemann_event_t *wrr_value_to_event(struct riemann_host const *host, /* {{{ */
 262                                            data_set_t const *ds,
 263                                            value_list_t const *vl, size_t index,
 264                                            gauge_t const *rates,
 265                                            int status)
 266 {
 267         riemann_event_t *event;
 268         char name_buffer[5 * DATA_MAX_NAME_LEN];
 269         char service_buffer[6 * DATA_MAX_NAME_LEN];
 270         size_t i;
 271
 272         event = riemann_event_new();
 273         if (event == NULL)
 274         {
 275                 ERROR("write_riemann plugin: riemann_event_new() failed.");
 276                 return (NULL);
 277         }
 278
 279         format_name(name_buffer, sizeof(name_buffer),
 280                     /* host = */ "", vl->plugin, vl->plugin_instance,
 281                     vl->type, vl->type_instance);
 282         if (host->always_append_ds || (ds->ds_num > 1))
 283         {
 284                 if (host->event_service_prefix == NULL)
 285                         ssnprintf(service_buffer, sizeof(service_buffer), "%s/%s",
 286                                   &name_buffer[1], ds->ds[index].name);
 287                 else
 288                         ssnprintf(service_buffer, sizeof(service_buffer), "%s%s/%s",
 289                                   host->event_service_prefix, &name_buffer[1], ds->ds[index].name);
 290         }
 291         else
 292         {
 293                 if (host->event_service_prefix == NULL)
 294                         sstrncpy(service_buffer, &name_buffer[1], sizeof(service_buffer));
 295                 else
 296                         ssnprintf(service_buffer, sizeof(service_buffer), "%s%s",
 297                                   host->event_service_prefix, &name_buffer[1]);
 298         }
 299
 300         riemann_event_set(event,
 301                           RIEMANN_EVENT_FIELD_HOST, vl->host,
 302                           RIEMANN_EVENT_FIELD_TIME, (int64_t) CDTIME_T_TO_TIME_T(vl->time),
 303                           RIEMANN_EVENT_FIELD_TTL, (float) CDTIME_T_TO_DOUBLE(vl->interval) * host->ttl_factor,
 304                           RIEMANN_EVENT_FIELD_STRING_ATTRIBUTES,
 305                           "plugin", vl->plugin,
 306                           "type", vl->type,
 307                           "ds_name", ds->ds[index].name,
 308                           NULL,
 309                           RIEMANN_EVENT_FIELD_SERVICE, service_buffer,
 310                           RIEMANN_EVENT_FIELD_NONE);
 311
 312         if (host->check_thresholds) {
 313                 const char *state = NULL;
 314
 315                 switch (status) {
 316                         case STATE_OKAY:
 317                                 state = "ok";
 318                                 break;
 319                         case STATE_ERROR:
 320                                 state = "critical";
 321                                 break;
 322                         case STATE_WARNING:
 323                                 state = "warning";
 324                                 break;
 325                         case STATE_MISSING:
 326                                 state = "unknown";
 327                                 break;
 328                 }
 329                 if (state)
 330                         riemann_event_set(event, RIEMANN_EVENT_FIELD_STATE, state,
 331                                           RIEMANN_EVENT_FIELD_NONE);
 332         }
 333
 334         if (vl->plugin_instance[0] != 0)
 335                 riemann_event_string_attribute_add(event, "plugin_instance", vl->plugin_instance);
 336         if (vl->type_instance[0] != 0)
 337                 riemann_event_string_attribute_add(event, "type_instance", vl->type_instance);
 338
 339         if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL))
 340         {
 341                 char ds_type[DATA_MAX_NAME_LEN];
 342
 343                 ssnprintf(ds_type, sizeof(ds_type), "%s:rate",
 344                           DS_TYPE_TO_STRING(ds->ds[index].type));
 345                 riemann_event_string_attribute_add(event, "ds_type", ds_type);
 346         }
 347         else
 348         {
 349                 riemann_event_string_attribute_add(event, "ds_type",
 350                                        DS_TYPE_TO_STRING(ds->ds[index].type));
 351         }
 352
 353         {
 354                 char ds_index[DATA_MAX_NAME_LEN];
 355
 356                 ssnprintf(ds_index, sizeof(ds_index), "%zu", index);
 357                 riemann_event_string_attribute_add(event, "ds_index", ds_index);
 358         }
 359
 360         for (i = 0; i < riemann_attrs_num; i += 2)
 361                 riemann_event_string_attribute_add(event, riemann_attrs[i], riemann_attrs[i +1]);
 362
 363         for (i = 0; i < riemann_tags_num; i++)
 364                 riemann_event_tag_add(event, riemann_tags[i]);
 365
 366         if (ds->ds[index].type == DS_TYPE_GAUGE)
 367         {
 368                 riemann_event_set(event,
 369                                   RIEMANN_EVENT_FIELD_METRIC_D,
 370                                   (double) vl->values[index].gauge,
 371                                   RIEMANN_EVENT_FIELD_NONE);
 372         }
 373         else if (rates != NULL)
 374         {
 375                 riemann_event_set(event,
 376                                   RIEMANN_EVENT_FIELD_METRIC_D,
 377                                   (double) rates[index],
 378                                   RIEMANN_EVENT_FIELD_NONE);
 379         }
 380         else
 381         {
 382                 int64_t metric;
 383
 384                 if (ds->ds[index].type == DS_TYPE_DERIVE)
 385                         metric = (int64_t) vl->values[index].derive;
 386                 else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
 387                         metric = (int64_t) vl->values[index].absolute;
 388                 else
 389                         metric = (int64_t) vl->values[index].counter;
 390
 391                 riemann_event_set(event,
 392                                   RIEMANN_EVENT_FIELD_METRIC_S64,
 393                                   (int64_t) metric,
 394                                   RIEMANN_EVENT_FIELD_NONE);
 395         }
 396
 397         DEBUG("write_riemann plugin: Successfully created message for metric: "
 398               "host = \"%s\", service = \"%s\"",
 399               event->host, event->service);
 400         return (event);
 401 } /* }}} riemann_event_t *wrr_value_to_event */
 402
 403 static riemann_message_t *wrr_value_list_to_message(struct riemann_host const *host, /* {{{ */
 404                                                     data_set_t const *ds,
 405                                                     value_list_t const *vl,
 406                                                     int *statuses)
 407 {
 408         riemann_message_t *msg;
 409         size_t i;
 410         gauge_t *rates = NULL;
 411
 412         /* Initialize the Msg structure. */
 413         msg = riemann_message_new();
 414         if (msg == NULL)
 415         {
 416                 ERROR ("write_riemann plugin: riemann_message_new failed.");
 417                 return (NULL);
 418         }
 419
 420         if (host->store_rates)
 421         {
 422                 rates = uc_get_rate(ds, vl);
 423                 if (rates == NULL)
 424                 {
 425                         ERROR("write_riemann plugin: uc_get_rate failed.");
 426                         riemann_message_free(msg);
 427                         return (NULL);
 428                 }
 429         }
 430
 431         for (i = 0; i < vl->values_len; i++)
 432         {
 433                 riemann_event_t *event;
 434
 435                 event = wrr_value_to_event(host, ds, vl,
 436                                            (int) i, rates, statuses[i]);
 437                 if (event == NULL)
 438                 {
 439                         riemann_message_free(msg);
 440                         sfree(rates);
 441                         return (NULL);
 442                 }
 443                 riemann_message_append_events(msg, event, NULL);
 444         }
 445
 446         sfree(rates);
 447         return (msg);
 448 } /* }}} riemann_message_t *wrr_value_list_to_message */
 449
 450 /*
 451  * Always call while holding host->lock !
 452  */
 453 static int wrr_batch_flush_nolock(cdtime_t timeout,
 454                                   struct riemann_host *host)
 455 {
 456         cdtime_t    now;
 457         int         status = 0;
 458
 459         if (timeout > 0) {
 460                 now = cdtime();
 461                 if ((host->batch_init + timeout) > now)
 462                         return status;
 463         }
 464         wrr_send(host, host->batch_msg);
 465         riemann_message_free(host->batch_msg);
 466
 467         if (host->client_type != RIEMANN_CLIENT_UDP)
 468         {
 469                 riemann_message_t *response;
 470
 471                 response = riemann_client_recv_message(host->client);
 472
 473                 if (!response)
 474                 {
 475                         wrr_disconnect(host);
 476                         return errno;
 477                 }
 478
 479                 riemann_message_free(response);
 480         }
 481
 482         host->batch_init = cdtime();
 483         host->batch_msg = NULL;
 484         return status;
 485 }
 486
 487 static int wrr_batch_flush(cdtime_t timeout,
 488         const char *identifier __attribute__((unused)),
 489         user_data_t *user_data)
 490 {
 491         struct riemann_host *host;
 492         int status;
 493
 494         if (user_data == NULL)
 495                 return (-EINVAL);
 496
 497         host = user_data->data;
 498         pthread_mutex_lock(&host->lock);
 499         status = wrr_batch_flush_nolock(timeout, host);
 500         if (status != 0)
 501         c_complain (LOG_ERR, &host->init_complaint,
 502                     "write_riemann plugin: riemann_client_send failed with status %i",
 503                     status);
 504     else
 505         c_release (LOG_DEBUG, &host->init_complaint, "write_riemann plugin: batch sent.");
 506
 507         pthread_mutex_unlock(&host->lock);
 508         return status;
 509 }
 510
 511 static int wrr_batch_add_value_list(struct riemann_host *host, /* {{{ */
 512                                     data_set_t const *ds,
 513                                     value_list_t const *vl,
 514                                     int *statuses)
 515 {
 516         riemann_message_t *msg;
 517         size_t len;
 518         int ret;
 519     cdtime_t timeout;
 520
 521         msg = wrr_value_list_to_message(host, ds, vl, statuses);
 522         if (msg == NULL)
 523                 return -1;
 524
 525         pthread_mutex_lock(&host->lock);
 526
 527         if (host->batch_msg == NULL) {
 528                 host->batch_msg = msg;
 529         } else {
 530                 int status;
 531
 532                 status = riemann_message_append_events_n(host->batch_msg,
 533                                                          msg->n_events,
 534                                                          msg->events);
 535                 msg->n_events = 0;
 536                 msg->events = NULL;
 537
 538                 riemann_message_free(msg);
 539
 540                 if (status != 0) {
 541                         pthread_mutex_unlock(&host->lock);
 542                         ERROR("write_riemann plugin: out of memory");
 543                         return -1;
 544                 }
 545         }
 546
 547         len = riemann_message_get_packed_size(host->batch_msg);
 548         ret = 0;
 549         if ((host->batch_max < 0) || (((size_t) host->batch_max) <= len)) {
 550                 ret = wrr_batch_flush_nolock(0, host);
 551         } else {
 552         if (host->batch_timeout > 0) {
 553             timeout = TIME_T_TO_CDTIME_T((time_t)host->batch_timeout);
 554             ret = wrr_batch_flush_nolock(timeout, host);
 555         }
 556     }
 557
 558         pthread_mutex_unlock(&host->lock);
 559         return ret;
 560 } /* }}} riemann_message_t *wrr_batch_add_value_list */
 561
 562 static int wrr_notification(const notification_t *n, user_data_t *ud) /* {{{ */
 563 {
 564         int                      status;
 565         struct riemann_host     *host = ud->data;
 566         riemann_message_t       *msg;
 567
 568         if (!host->notifications)
 569                 return 0;
 570
 571     /*
 572      * Never batch for notifications, send them ASAP
 573      */
 574         msg = wrr_notification_to_message(host, n);
 575         if (msg == NULL)
 576                 return (-1);
 577
 578         status = wrr_send(host, msg);
 579         if (status != 0)
 580         c_complain (LOG_ERR, &host->init_complaint,
 581                     "write_riemann plugin: riemann_client_send failed with status %i",
 582                     status);
 583     else
 584         c_release (LOG_DEBUG, &host->init_complaint,
 585                    "write_riemann plugin: riemann_client_send succeeded");
 586
 587         riemann_message_free(msg);
 588         return (status);
 589 } /* }}} int wrr_notification */
 590
 591 static int wrr_write(const data_set_t *ds, /* {{{ */
 592               const value_list_t *vl,
 593               user_data_t *ud)
 594 {
 595         int                      status = 0;
 596         int                      statuses[vl->values_len];
 597         struct riemann_host     *host = ud->data;
 598         riemann_message_t       *msg;
 599
 600         if (host->check_thresholds) {
 601                 status = write_riemann_threshold_check(ds, vl, statuses);
 602     if (status != 0)
 603       return status;
 604   } else {
 605     memset (statuses, 0, sizeof (statuses));
 606   }
 607
 608   if (host->client_type != RIEMANN_CLIENT_UDP && host->batch_mode) {
 609     wrr_batch_add_value_list(host, ds, vl, statuses);
 610   } else {
 611     msg = wrr_value_list_to_message(host, ds, vl, statuses);
 612     if (msg == NULL)
 613       return (-1);
 614
 615     status = wrr_send(host, msg);
 616
 617     riemann_message_free(msg);
 618   }
 619   return status;
 620 } /* }}} int wrr_write */
 621
 622 static void wrr_free(void *p) /* {{{ */
 623 {
 624   struct riemann_host   *host = p;
 625
 626   if (host == NULL)
 627     return;
 628
 629   pthread_mutex_lock(&host->lock);
 630
 631   host->reference_count--;
 632   if (host->reference_count > 0)
 633     {
 634       pthread_mutex_unlock(&host->lock);
 635       return;
 636     }
 637
 638   wrr_disconnect(host);
 639
 640   pthread_mutex_destroy(&host->lock);
 641   sfree(host);
 642 } /* }}} void wrr_free */
 643
 644 static int wrr_config_node(oconfig_item_t *ci) /* {{{ */
 645 {
 646   struct riemann_host   *host = NULL;
 647   int                    status = 0;
 648   int                    i;
 649   oconfig_item_t                *child;
 650   char                   callback_name[DATA_MAX_NAME_LEN];
 651   user_data_t            ud;
 652
 653   if ((host = calloc(1, sizeof(*host))) == NULL) {
 654     ERROR ("write_riemann plugin: calloc failed.");
 655     return ENOMEM;
 656   }
 657   pthread_mutex_init(&host->lock, NULL);
 658   C_COMPLAIN_INIT (&host->init_complaint);
 659   host->reference_count = 1;
 660   host->node = NULL;
 661   host->port = 0;
 662   host->notifications = 1;
 663   host->check_thresholds = 0;
 664   host->store_rates = 1;
 665   host->always_append_ds = 0;
 666   host->batch_mode = 1;
 667   host->batch_max = RIEMANN_BATCH_MAX; /* typical MSS */
 668   host->batch_init = cdtime();
 669   host->batch_timeout = 0;
 670   host->ttl_factor = RIEMANN_TTL_FACTOR;
 671   host->client = NULL;
 672   host->client_type = RIEMANN_CLIENT_TCP;
 673   host->timeout.tv_sec = 0;
 674   host->timeout.tv_usec = 0;
 675
 676   status = cf_util_get_string(ci, &host->name);
 677   if (status != 0) {
 678     WARNING("write_riemann plugin: Required host name is missing.");
 679     wrr_free(host);
 680     return -1;
 681   }
 682
 683   for (i = 0; i < ci->children_num; i++) {
 684     /*
 685      * The code here could be simplified but makes room
 686      * for easy adding of new options later on.
 687      */
 688     child = &ci->children[i];
 689     status = 0;
 690
 691     if (strcasecmp("Host", child->key) == 0) {
 692       status = cf_util_get_string(child, &host->node);
 693       if (status != 0)
 694         break;
 695     } else if (strcasecmp("Notifications", child->key) == 0) {
 696       status = cf_util_get_boolean(child, &host->notifications);
 697       if (status != 0)
 698         break;
 699     } else if (strcasecmp("EventServicePrefix", child->key) == 0) {
 700       status = cf_util_get_string(child, &host->event_service_prefix);
 701       if (status != 0)
 702         break;
 703     } else if (strcasecmp("CheckThresholds", child->key) == 0) {
 704       status = cf_util_get_boolean(child, &host->check_thresholds);
 705       if (status != 0)
 706         break;
 707     } else if (strcasecmp("Batch", child->key) == 0) {
 708       status = cf_util_get_boolean(child, &host->batch_mode);
 709       if (status != 0)
 710         break;
 711     } else if (strcasecmp("BatchMaxSize", child->key) == 0) {
 712       status = cf_util_get_int(child, &host->batch_max);
 713       if (status != 0)
 714         break;
 715     } else if (strcasecmp("BatchFlushTimeout", child->key) == 0) {
 716       status = cf_util_get_int(child, &host->batch_timeout);
 717       if (status != 0)
 718         break;
 719     } else if (strcasecmp("Timeout", child->key) == 0) {
 720       status = cf_util_get_int(child, (int *)&host->timeout.tv_sec);
 721       if (status != 0)
 722         break;
 723     } else if (strcasecmp("Port", child->key) == 0) {
 724       host->port = cf_util_get_port_number(child);
 725       if (host->port == -1) {
 726         ERROR("write_riemann plugin: Invalid argument "
 727               "configured for the \"Port\" "
 728               "option.");
 729         break;
 730       }
 731     } else if (strcasecmp("Protocol", child->key) == 0) {
 732       char tmp[16];
 733       status = cf_util_get_string_buffer(child,
 734                                          tmp, sizeof(tmp));
 735       if (status != 0)
 736         {
 737           ERROR("write_riemann plugin: cf_util_get_"
 738                 "string_buffer failed with "
 739                 "status %i.", status);
 740           break;
 741         }
 742
 743       if (strcasecmp("UDP", tmp) == 0)
 744         host->client_type = RIEMANN_CLIENT_UDP;
 745       else if (strcasecmp("TCP", tmp) == 0)
 746         host->client_type = RIEMANN_CLIENT_TCP;
 747       else if (strcasecmp("TLS", tmp) == 0)
 748         host->client_type = RIEMANN_CLIENT_TLS;
 749       else
 750         WARNING("write_riemann plugin: The value "
 751                 "\"%s\" is not valid for the "
 752                 "\"Protocol\" option. Use "
 753                 "either \"UDP\", \"TCP\" or \"TLS\".",
 754                 tmp);
 755     } else if (strcasecmp("TLSCAFile", child->key) == 0) {
 756       status = cf_util_get_string(child, &host->tls_ca_file);
 757       if (status != 0)
 758         {
 759           ERROR("write_riemann plugin: cf_util_get_"
 760                 "string_buffer failed with "
 761                 "status %i.", status);
 762           break;
 763         }
 764     } else if (strcasecmp("TLSCertFile", child->key) == 0) {
 765       status = cf_util_get_string(child, &host->tls_cert_file);
 766       if (status != 0)
 767         {
 768           ERROR("write_riemann plugin: cf_util_get_"
 769                 "string_buffer failed with "
 770                 "status %i.", status);
 771           break;
 772         }
 773     } else if (strcasecmp("TLSKeyFile", child->key) == 0) {
 774       status = cf_util_get_string(child, &host->tls_key_file);
 775       if (status != 0)
 776         {
 777           ERROR("write_riemann plugin: cf_util_get_"
 778                 "string_buffer failed with "
 779                 "status %i.", status);
 780           break;
 781         }
 782     } else if (strcasecmp("StoreRates", child->key) == 0) {
 783       status = cf_util_get_boolean(child, &host->store_rates);
 784       if (status != 0)
 785         break;
 786     } else if (strcasecmp("AlwaysAppendDS", child->key) == 0) {
 787       status = cf_util_get_boolean(child,
 788                                    &host->always_append_ds);
 789       if (status != 0)
 790         break;
 791     } else if (strcasecmp("TTLFactor", child->key) == 0) {
 792       double tmp = NAN;
 793       status = cf_util_get_double(child, &tmp);
 794       if (status != 0)
 795         break;
 796       if (tmp >= 2.0) {
 797         host->ttl_factor = tmp;
 798       } else if (tmp >= 1.0) {
 799         NOTICE("write_riemann plugin: The configured "
 800                "TTLFactor is very small "
 801                "(%.1f). A value of 2.0 or "
 802                "greater is recommended.",
 803                tmp);
 804         host->ttl_factor = tmp;
 805       } else if (tmp > 0.0) {
 806         WARNING("write_riemann plugin: The configured "
 807                 "TTLFactor is too small to be "
 808                 "useful (%.1f). I'll use it "
 809                 "since the user knows best, "
 810                 "but under protest.",
 811                 tmp);
 812         host->ttl_factor = tmp;
 813       } else { /* zero, negative and NAN */
 814         ERROR("write_riemann plugin: The configured "
 815               "TTLFactor is invalid (%.1f).",
 816               tmp);
 817       }
 818     } else {
 819       WARNING("write_riemann plugin: ignoring unknown config "
 820               "option: \"%s\"", child->key);
 821     }
 822   }
 823   if (status != 0) {
 824     wrr_free(host);
 825     return status;
 826   }
 827
 828   ssnprintf(callback_name, sizeof(callback_name), "write_riemann/%s",
 829             host->name);
 830   ud.data = host;
 831   ud.free_func = wrr_free;
 832
 833   pthread_mutex_lock(&host->lock);
 834
 835   status = plugin_register_write(callback_name, wrr_write, &ud);
 836
 837   if (host->client_type != RIEMANN_CLIENT_UDP && host->batch_mode) {
 838     ud.free_func = NULL;
 839     plugin_register_flush(callback_name, wrr_batch_flush, &ud);
 840   }
 841   if (status != 0)
 842     WARNING("write_riemann plugin: plugin_register_write (\"%s\") "
 843             "failed with status %i.",
 844             callback_name, status);
 845   else /* success */
 846     host->reference_count++;
 847
 848   status = plugin_register_notification(callback_name,
 849                                         wrr_notification, &ud);
 850   if (status != 0)
 851     WARNING("write_riemann plugin: plugin_register_notification (\"%s\") "
 852             "failed with status %i.",
 853             callback_name, status);
 854   else /* success */
 855     host->reference_count++;
 856
 857   if (host->reference_count <= 1)
 858     {
 859       /* Both callbacks failed => free memory.
 860        * We need to unlock here, because riemann_free() will lock.
 861        * This is not a race condition, because we're the only one
 862        * holding a reference. */
 863       pthread_mutex_unlock(&host->lock);
 864       wrr_free(host);
 865       return (-1);
 866     }
 867
 868   host->reference_count--;
 869   pthread_mutex_unlock(&host->lock);
 870
 871   return status;
 872 } /* }}} int wrr_config_node */
 873
 874 static int wrr_config(oconfig_item_t *ci) /* {{{ */
 875 {
 876   int            i;
 877   oconfig_item_t        *child;
 878   int            status;
 879
 880   for (i = 0; i < ci->children_num; i++)  {
 881     child = &ci->children[i];
 882
 883     if (strcasecmp("Node", child->key) == 0) {
 884       wrr_config_node (child);
 885     } else if (strcasecmp(child->key, "attribute") == 0) {
 886       char *key = NULL;
 887       char *val = NULL;
 888
 889       if (child->values_num != 2) {
 890         WARNING("riemann attributes need both a key and a value.");
 891         return (-1);
 892       }
 893       if (child->values[0].type != OCONFIG_TYPE_STRING ||
 894           child->values[1].type != OCONFIG_TYPE_STRING) {
 895         WARNING("riemann attribute needs string arguments.");
 896         return (-1);
 897       }
 898       if ((key = strdup(child->values[0].value.string)) == NULL) {
 899         WARNING("cannot allocate memory for attribute key.");
 900         return (-1);
 901       }
 902       if ((val = strdup(child->values[1].value.string)) == NULL) {
 903         WARNING("cannot allocate memory for attribute value.");
 904         sfree(key);
 905         return (-1);
 906       }
 907       strarray_add(&riemann_attrs, &riemann_attrs_num, key);
 908       strarray_add(&riemann_attrs, &riemann_attrs_num, val);
 909       DEBUG("write_riemann: got attr: %s => %s", key, val);
 910       sfree(key);
 911       sfree(val);
 912     } else if (strcasecmp(child->key, "tag") == 0) {
 913       char *tmp = NULL;
 914       status = cf_util_get_string(child, &tmp);
 915       if (status != 0)
 916         continue;
 917
 918       strarray_add(&riemann_tags, &riemann_tags_num, tmp);
 919       DEBUG("write_riemann plugin: Got tag: %s", tmp);
 920       sfree(tmp);
 921     } else {
 922       WARNING("write_riemann plugin: Ignoring unknown "
 923               "configuration option \"%s\" at top level.",
 924               child->key);
 925     }
 926   }
 927   return (0);
 928 } /* }}} int wrr_config */
 929
 930 void module_register(void)
 931 {
 932   plugin_register_complex_config("write_riemann", wrr_config);
 933 }
 934
 935 /* vim: set sw=8 sts=8 ts=8 noet : */