src/mysql.c

   1 /**
   2  * collectd - src/mysql.c
   3  * Copyright (C) 2006-2010  Florian octo Forster
   4  * Copyright (C) 2008       Mirko Buffoni
   5  * Copyright (C) 2009       Doug MacEachern
   6  * Copyright (C) 2009       Sebastian tokkee Harl
   7  * Copyright (C) 2009       Rodolphe Quiédeville
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; only version 2 of the License is applicable.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  21  *
  22  * Authors:
  23  *   Florian octo Forster <octo at collectd.org>
  24  *   Mirko Buffoni <briareos at eswat.org>
  25  *   Doug MacEachern <dougm at hyperic.com>
  26  *   Sebastian tokkee Harl <sh at tokkee.org>
  27  *   Rodolphe Quiédeville <rquiedeville at bearstech.com>
  28  **/
  29
  30 #include "collectd.h"
  31
  32 #include "common.h"
  33 #include "plugin.h"
  34 #include "configfile.h"
  35
  36 #ifdef HAVE_MYSQL_H
  37 #include <mysql.h>
  38 #elif defined(HAVE_MYSQL_MYSQL_H)
  39 #include <mysql/mysql.h>
  40 #endif
  41
  42 struct mysql_database_s /* {{{ */
  43 {
  44         char *instance;
  45         char *alias;
  46         char *host;
  47         char *user;
  48         char *pass;
  49         char *database;
  50         char *socket;
  51         int   port;
  52         int   timeout;
  53
  54         _Bool master_stats;
  55         _Bool slave_stats;
  56         _Bool innodb_stats;
  57
  58         _Bool slave_notif;
  59         _Bool slave_io_running;
  60         _Bool slave_sql_running;
  61
  62         MYSQL *con;
  63         _Bool  is_connected;
  64 };
  65 typedef struct mysql_database_s mysql_database_t; /* }}} */
  66
  67 static int mysql_read (user_data_t *ud);
  68
  69 static void mysql_database_free (void *arg) /* {{{ */
  70 {
  71         mysql_database_t *db;
  72
  73         DEBUG ("mysql plugin: mysql_database_free (arg = %p);", arg);
  74
  75         db = arg;
  76
  77         if (db == NULL)
  78                 return;
  79
  80         if (db->con != NULL)
  81                 mysql_close (db->con);
  82
  83         sfree (db->alias);
  84         sfree (db->host);
  85         sfree (db->user);
  86         sfree (db->pass);
  87         sfree (db->socket);
  88         sfree (db->instance);
  89         sfree (db->database);
  90         sfree (db);
  91 } /* }}} void mysql_database_free */
  92
  93 /* Configuration handling functions {{{
  94  *
  95  * <Plugin mysql>
  96  *   <Database "plugin_instance1">
  97  *     Host "localhost"
  98  *     Port 22000
  99  *     ...
 100  *   </Database>
 101  * </Plugin>
 102  */
 103 static int mysql_config_database (oconfig_item_t *ci) /* {{{ */
 104 {
 105         mysql_database_t *db;
 106         int status = 0;
 107
 108         if ((ci->values_num != 1)
 109             || (ci->values[0].type != OCONFIG_TYPE_STRING))
 110         {
 111                 WARNING ("mysql plugin: The `Database' block "
 112                          "needs exactly one string argument.");
 113                 return (-1);
 114         }
 115
 116         db = calloc (1, sizeof (*db));
 117         if (db == NULL)
 118         {
 119                 ERROR ("mysql plugin: calloc failed.");
 120                 return (-1);
 121         }
 122
 123         /* initialize all the pointers */
 124         db->alias    = NULL;
 125         db->host     = NULL;
 126         db->user     = NULL;
 127         db->pass     = NULL;
 128         db->database = NULL;
 129         db->socket   = NULL;
 130         db->con      = NULL;
 131         db->timeout  = 0;
 132
 133         /* trigger a notification, if it's not running */
 134         db->slave_io_running  = 1;
 135         db->slave_sql_running = 1;
 136
 137         status = cf_util_get_string (ci, &db->instance);
 138         if (status != 0)
 139         {
 140                 sfree (db);
 141                 return (status);
 142         }
 143         assert (db->instance != NULL);
 144
 145         /* Fill the `mysql_database_t' structure.. */
 146         for (int i = 0; i < ci->children_num; i++)
 147         {
 148                 oconfig_item_t *child = ci->children + i;
 149
 150                 if (strcasecmp ("Alias", child->key) == 0)
 151                         status = cf_util_get_string (child, &db->alias);
 152                 else if (strcasecmp ("Host", child->key) == 0)
 153                         status = cf_util_get_string (child, &db->host);
 154                 else if (strcasecmp ("User", child->key) == 0)
 155                         status = cf_util_get_string (child, &db->user);
 156                 else if (strcasecmp ("Password", child->key) == 0)
 157                         status = cf_util_get_string (child, &db->pass);
 158                 else if (strcasecmp ("Port", child->key) == 0)
 159                 {
 160                         status = cf_util_get_port_number (child);
 161                         if (status > 0)
 162                         {
 163                                 db->port = status;
 164                                 status = 0;
 165                         }
 166                 }
 167                 else if (strcasecmp ("Socket", child->key) == 0)
 168                         status = cf_util_get_string (child, &db->socket);
 169                 else if (strcasecmp ("Database", child->key) == 0)
 170                         status = cf_util_get_string (child, &db->database);
 171                 else if (strcasecmp ("ConnectTimeout", child->key) == 0)
 172                         status = cf_util_get_int (child, &db->timeout);
 173                 else if (strcasecmp ("MasterStats", child->key) == 0)
 174                         status = cf_util_get_boolean (child, &db->master_stats);
 175                 else if (strcasecmp ("SlaveStats", child->key) == 0)
 176                         status = cf_util_get_boolean (child, &db->slave_stats);
 177                 else if (strcasecmp ("SlaveNotifications", child->key) == 0)
 178                         status = cf_util_get_boolean (child, &db->slave_notif);
 179                 else if (strcasecmp ("InnodbStats", child->key) == 0)
 180                         status = cf_util_get_boolean (child, &db->innodb_stats);
 181                 else
 182                 {
 183                         WARNING ("mysql plugin: Option `%s' not allowed here.", child->key);
 184                         status = -1;
 185                 }
 186
 187                 if (status != 0)
 188                         break;
 189         }
 190
 191         /* If all went well, register this database for reading */
 192         if (status == 0)
 193         {
 194                 user_data_t ud = { 0 };
 195                 char cb_name[DATA_MAX_NAME_LEN];
 196
 197                 DEBUG ("mysql plugin: Registering new read callback: %s",
 198                                 (db->database != NULL) ? db->database : "<default>");
 199
 200                 ud.data = (void *) db;
 201                 ud.free_func = mysql_database_free;
 202
 203                 if (db->instance != NULL)
 204                         ssnprintf (cb_name, sizeof (cb_name), "mysql-%s",
 205                                         db->instance);
 206                 else
 207                         sstrncpy (cb_name, "mysql", sizeof (cb_name));
 208
 209                 plugin_register_complex_read (/* group = */ NULL, cb_name,
 210                                               mysql_read,
 211                                               /* interval = */ 0, &ud);
 212         }
 213         else
 214         {
 215                 mysql_database_free (db);
 216                 return (-1);
 217         }
 218
 219         return (0);
 220 } /* }}} int mysql_config_database */
 221
 222 static int mysql_config (oconfig_item_t *ci) /* {{{ */
 223 {
 224         if (ci == NULL)
 225                 return (EINVAL);
 226
 227         /* Fill the `mysql_database_t' structure.. */
 228         for (int i = 0; i < ci->children_num; i++)
 229         {
 230                 oconfig_item_t *child = ci->children + i;
 231
 232                 if (strcasecmp ("Database", child->key) == 0)
 233                         mysql_config_database (child);
 234                 else
 235                         WARNING ("mysql plugin: Option \"%s\" not allowed here.",
 236                                         child->key);
 237         }
 238
 239         return (0);
 240 } /* }}} int mysql_config */
 241
 242 /* }}} End of configuration handling functions */
 243
 244 static MYSQL *getconnection (mysql_database_t *db)
 245 {
 246         if (db->is_connected)
 247         {
 248                 int status;
 249
 250                 status = mysql_ping (db->con);
 251                 if (status == 0)
 252                         return (db->con);
 253
 254                 WARNING ("mysql plugin: Lost connection to instance \"%s\": %s",
 255                                 db->instance, mysql_error (db->con));
 256         }
 257         db->is_connected = 0;
 258
 259         if (db->con == NULL)
 260         {
 261                 db->con = mysql_init (NULL);
 262                 if (db->con == NULL)
 263                 {
 264                         ERROR ("mysql plugin: mysql_init failed: %s",
 265                                         mysql_error (db->con));
 266                         return (NULL);
 267                 }
 268         }
 269
 270         /* Configure TCP connect timeout (default: 0) */
 271         db->con->options.connect_timeout = db->timeout;
 272
 273         if (mysql_real_connect (db->con, db->host, db->user, db->pass,
 274                                 db->database, db->port, db->socket, 0) == NULL)
 275         {
 276                 ERROR ("mysql plugin: Failed to connect to database %s "
 277                                 "at server %s: %s",
 278                                 (db->database != NULL) ? db->database : "<none>",
 279                                 (db->host != NULL) ? db->host : "localhost",
 280                                 mysql_error (db->con));
 281                 return (NULL);
 282         }
 283
 284         INFO ("mysql plugin: Successfully connected to database %s "
 285                         "at server %s (server version: %s, protocol version: %d)",
 286                         (db->database != NULL) ? db->database : "<none>",
 287                         mysql_get_host_info (db->con),
 288                         mysql_get_server_info (db->con),
 289                         mysql_get_proto_info (db->con));
 290
 291         db->is_connected = 1;
 292         return (db->con);
 293 } /* static MYSQL *getconnection (mysql_database_t *db) */
 294
 295 static void set_host (mysql_database_t *db, char *buf, size_t buflen)
 296 {
 297         if (db->alias)
 298                 sstrncpy (buf, db->alias, buflen);
 299         else if ((db->host == NULL)
 300                         || (strcmp ("", db->host) == 0)
 301                         || (strcmp ("127.0.0.1", db->host) == 0)
 302                         || (strcmp ("localhost", db->host) == 0))
 303                 sstrncpy (buf, hostname_g, buflen);
 304         else
 305                 sstrncpy (buf, db->host, buflen);
 306 } /* void set_host */
 307
 308 static void submit (const char *type, const char *type_instance,
 309                 value_t *values, size_t values_len, mysql_database_t *db)
 310 {
 311         value_list_t vl = VALUE_LIST_INIT;
 312
 313         vl.values     = values;
 314         vl.values_len = values_len;
 315
 316         set_host (db, vl.host, sizeof (vl.host));
 317
 318         sstrncpy (vl.plugin, "mysql", sizeof (vl.plugin));
 319
 320         /* Assured by "mysql_config_database" */
 321         assert (db->instance != NULL);
 322         sstrncpy (vl.plugin_instance, db->instance, sizeof (vl.plugin_instance));
 323
 324         sstrncpy (vl.type, type, sizeof (vl.type));
 325         if (type_instance != NULL)
 326                 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
 327
 328         plugin_dispatch_values (&vl);
 329 } /* submit */
 330
 331 static void counter_submit (const char *type, const char *type_instance,
 332                 derive_t value, mysql_database_t *db)
 333 {
 334         value_t values[1];
 335
 336         values[0].derive = value;
 337         submit (type, type_instance, values, STATIC_ARRAY_SIZE (values), db);
 338 } /* void counter_submit */
 339
 340 static void gauge_submit (const char *type, const char *type_instance,
 341                 gauge_t value, mysql_database_t *db)
 342 {
 343         value_t values[1];
 344
 345         values[0].gauge = value;
 346         submit (type, type_instance, values, STATIC_ARRAY_SIZE (values), db);
 347 } /* void gauge_submit */
 348
 349 static void derive_submit (const char *type, const char *type_instance,
 350                 derive_t value, mysql_database_t *db)
 351 {
 352         value_t values[1];
 353
 354         values[0].derive = value;
 355         submit (type, type_instance, values, STATIC_ARRAY_SIZE (values), db);
 356 } /* void derive_submit */
 357
 358 static void traffic_submit (derive_t rx, derive_t tx, mysql_database_t *db)
 359 {
 360         value_t values[2];
 361
 362         values[0].derive = rx;
 363         values[1].derive = tx;
 364
 365         submit ("mysql_octets", NULL, values, STATIC_ARRAY_SIZE (values), db);
 366 } /* void traffic_submit */
 367
 368 static MYSQL_RES *exec_query (MYSQL *con, const char *query)
 369 {
 370         MYSQL_RES *res;
 371
 372         int query_len = strlen (query);
 373
 374         if (mysql_real_query (con, query, query_len))
 375         {
 376                 ERROR ("mysql plugin: Failed to execute query: %s",
 377                                 mysql_error (con));
 378                 INFO ("mysql plugin: SQL query was: %s", query);
 379                 return (NULL);
 380         }
 381
 382         res = mysql_store_result (con);
 383         if (res == NULL)
 384         {
 385                 ERROR ("mysql plugin: Failed to store query result: %s",
 386                                 mysql_error (con));
 387                 INFO ("mysql plugin: SQL query was: %s", query);
 388                 return (NULL);
 389         }
 390
 391         return (res);
 392 } /* exec_query */
 393
 394 static int mysql_read_master_stats (mysql_database_t *db, MYSQL *con)
 395 {
 396         MYSQL_RES *res;
 397         MYSQL_ROW  row;
 398
 399         const char *query;
 400         int         field_num;
 401         unsigned long long position;
 402
 403         query = "SHOW MASTER STATUS";
 404
 405         res = exec_query (con, query);
 406         if (res == NULL)
 407                 return (-1);
 408
 409         row = mysql_fetch_row (res);
 410         if (row == NULL)
 411         {
 412                 ERROR ("mysql plugin: Failed to get master statistics: "
 413                                 "`%s' did not return any rows.", query);
 414                 mysql_free_result (res);
 415                 return (-1);
 416         }
 417
 418         field_num = mysql_num_fields (res);
 419         if (field_num < 2)
 420         {
 421                 ERROR ("mysql plugin: Failed to get master statistics: "
 422                                 "`%s' returned less than two columns.", query);
 423                 mysql_free_result (res);
 424                 return (-1);
 425         }
 426
 427         position = atoll (row[1]);
 428         counter_submit ("mysql_log_position", "master-bin", position, db);
 429
 430         row = mysql_fetch_row (res);
 431         if (row != NULL)
 432                 WARNING ("mysql plugin: `%s' returned more than one row - "
 433                                 "ignoring further results.", query);
 434
 435         mysql_free_result (res);
 436
 437         return (0);
 438 } /* mysql_read_master_stats */
 439
 440 static int mysql_read_slave_stats (mysql_database_t *db, MYSQL *con)
 441 {
 442         MYSQL_RES *res;
 443         MYSQL_ROW  row;
 444
 445         const char *query;
 446         int         field_num;
 447
 448         /* WTF? libmysqlclient does not seem to provide any means to
 449          * translate a column name to a column index ... :-/ */
 450         const int READ_MASTER_LOG_POS_IDX   = 6;
 451         const int SLAVE_IO_RUNNING_IDX      = 10;
 452         const int SLAVE_SQL_RUNNING_IDX     = 11;
 453         const int EXEC_MASTER_LOG_POS_IDX   = 21;
 454         const int SECONDS_BEHIND_MASTER_IDX = 32;
 455
 456         query = "SHOW SLAVE STATUS";
 457
 458         res = exec_query (con, query);
 459         if (res == NULL)
 460                 return (-1);
 461
 462         row = mysql_fetch_row (res);
 463         if (row == NULL)
 464         {
 465                 ERROR ("mysql plugin: Failed to get slave statistics: "
 466                                 "`%s' did not return any rows.", query);
 467                 mysql_free_result (res);
 468                 return (-1);
 469         }
 470
 471         field_num = mysql_num_fields (res);
 472         if (field_num < 33)
 473         {
 474                 ERROR ("mysql plugin: Failed to get slave statistics: "
 475                                 "`%s' returned less than 33 columns.", query);
 476                 mysql_free_result (res);
 477                 return (-1);
 478         }
 479
 480         if (db->slave_stats)
 481         {
 482                 unsigned long long counter;
 483                 double gauge;
 484
 485                 counter = atoll (row[READ_MASTER_LOG_POS_IDX]);
 486                 counter_submit ("mysql_log_position", "slave-read", counter, db);
 487
 488                 counter = atoll (row[EXEC_MASTER_LOG_POS_IDX]);
 489                 counter_submit ("mysql_log_position", "slave-exec", counter, db);
 490
 491                 if (row[SECONDS_BEHIND_MASTER_IDX] != NULL)
 492                 {
 493                         gauge = atof (row[SECONDS_BEHIND_MASTER_IDX]);
 494                         gauge_submit ("time_offset", NULL, gauge, db);
 495                 }
 496         }
 497
 498         if (db->slave_notif)
 499         {
 500                 notification_t n = { 0, cdtime (), "", "",
 501                         "mysql", "", "time_offset", "", NULL };
 502
 503                 char *io, *sql;
 504
 505                 io  = row[SLAVE_IO_RUNNING_IDX];
 506                 sql = row[SLAVE_SQL_RUNNING_IDX];
 507
 508                 set_host (db, n.host, sizeof (n.host));
 509
 510                 /* Assured by "mysql_config_database" */
 511                 assert (db->instance != NULL);
 512                 sstrncpy (n.plugin_instance, db->instance, sizeof (n.plugin_instance));
 513
 514                 if (((io == NULL) || (strcasecmp (io, "yes") != 0))
 515                                 && (db->slave_io_running))
 516                 {
 517                         n.severity = NOTIF_WARNING;
 518                         ssnprintf (n.message, sizeof (n.message),
 519                                         "slave I/O thread not started or not connected to master");
 520                         plugin_dispatch_notification (&n);
 521                         db->slave_io_running = 0;
 522                 }
 523                 else if (((io != NULL) && (strcasecmp (io, "yes") == 0))
 524                                 && (! db->slave_io_running))
 525                 {
 526                         n.severity = NOTIF_OKAY;
 527                         ssnprintf (n.message, sizeof (n.message),
 528                                         "slave I/O thread started and connected to master");
 529                         plugin_dispatch_notification (&n);
 530                         db->slave_io_running = 1;
 531                 }
 532
 533                 if (((sql == NULL) || (strcasecmp (sql, "yes") != 0))
 534                                 && (db->slave_sql_running))
 535                 {
 536                         n.severity = NOTIF_WARNING;
 537                         ssnprintf (n.message, sizeof (n.message),
 538                                         "slave SQL thread not started");
 539                         plugin_dispatch_notification (&n);
 540                         db->slave_sql_running = 0;
 541                 }
 542                 else if (((sql != NULL) && (strcasecmp (sql, "yes") == 0))
 543                                 && (! db->slave_sql_running))
 544                 {
 545                         n.severity = NOTIF_OKAY;
 546                         ssnprintf (n.message, sizeof (n.message),
 547                                         "slave SQL thread started");
 548                         plugin_dispatch_notification (&n);
 549                         db->slave_sql_running = 1;
 550                 }
 551         }
 552
 553         row = mysql_fetch_row (res);
 554         if (row != NULL)
 555                 WARNING ("mysql plugin: `%s' returned more than one row - "
 556                                 "ignoring further results.", query);
 557
 558         mysql_free_result (res);
 559
 560         return (0);
 561 } /* mysql_read_slave_stats */
 562
 563 static int mysql_read_innodb_stats (mysql_database_t *db, MYSQL *con)
 564 {
 565         MYSQL_RES *res;
 566         MYSQL_ROW  row;
 567
 568         const char *query;
 569         struct {
 570                 const char *key;
 571                 const char *type;
 572                 int ds_type;
 573         } metrics[] = {
 574                 { "metadata_mem_pool_size",          "bytes",        DS_TYPE_GAUGE },
 575                 { "lock_deadlocks",                  "mysql_locks",  DS_TYPE_DERIVE },
 576                 { "lock_timeouts",                   "mysql_locks",  DS_TYPE_DERIVE },
 577                 { "lock_row_lock_current_waits",     "mysql_locks",  DS_TYPE_DERIVE },
 578                 { "buffer_pool_size",                "bytes",        DS_TYPE_GAUGE },
 579
 580                 { "os_log_bytes_written",            "operations",   DS_TYPE_DERIVE },
 581                 { "os_log_pending_fsyncs",           "operations",   DS_TYPE_DERIVE },
 582                 { "os_log_pending_writes",           "operations",   DS_TYPE_DERIVE },
 583
 584                 { "trx_rseg_history_len",            "gauge",        DS_TYPE_GAUGE },
 585
 586                 { "adaptive_hash_searches",          "operations",   DS_TYPE_DERIVE },
 587
 588                 { "file_num_open_files",             "gauge",        DS_TYPE_GAUGE },
 589
 590                 { "ibuf_merges_insert",              "operations",   DS_TYPE_DERIVE },
 591                 { "ibuf_merges_delete_mark",         "operations",   DS_TYPE_DERIVE },
 592                 { "ibuf_merges_delete",              "operations",   DS_TYPE_DERIVE },
 593                 { "ibuf_merges_discard_insert",      "operations",   DS_TYPE_DERIVE },
 594                 { "ibuf_merges_discard_delete_mark", "operations",   DS_TYPE_DERIVE },
 595                 { "ibuf_merges_discard_delete",      "operations",   DS_TYPE_DERIVE },
 596                 { "ibuf_merges_discard_merges",      "operations",   DS_TYPE_DERIVE },
 597                 { "ibuf_size",                       "bytes",        DS_TYPE_GAUGE },
 598
 599                 { "innodb_activity_count",           "gauge",        DS_TYPE_GAUGE },
 600
 601                 { "innodb_rwlock_s_spin_waits",      "operations",   DS_TYPE_DERIVE },
 602                 { "innodb_rwlock_x_spin_waits",      "operations",   DS_TYPE_DERIVE },
 603                 { "innodb_rwlock_s_spin_rounds",     "operations",   DS_TYPE_DERIVE },
 604                 { "innodb_rwlock_x_spin_rounds",     "operations",   DS_TYPE_DERIVE },
 605                 { "innodb_rwlock_s_os_waits",        "operations",   DS_TYPE_DERIVE },
 606                 { "innodb_rwlock_x_os_waits",        "operations",   DS_TYPE_DERIVE },
 607
 608                 { "dml_reads",                       "operations",   DS_TYPE_DERIVE },
 609                 { "dml_inserts",                     "operations",   DS_TYPE_DERIVE },
 610                 { "dml_deletes",                     "operations",   DS_TYPE_DERIVE },
 611                 { "dml_updates",                     "operations",   DS_TYPE_DERIVE },
 612
 613                 { NULL,                              NULL,           0}
 614         };
 615
 616         query = "SELECT name, count, type FROM information_schema.innodb_metrics WHERE status = 'enabled'";
 617
 618         res = exec_query (con, query);
 619         if (res == NULL)
 620                 return (-1);
 621
 622         while ((row = mysql_fetch_row (res)))
 623         {
 624                 int i;
 625                 char *key;
 626                 unsigned long long val;
 627
 628                 key = row[0];
 629                 val = atoll (row[1]);
 630
 631                 for (i = 0; metrics[i].key != NULL && strcmp(metrics[i].key, key) != 0; i++)
 632                         ;
 633
 634                 if (metrics[i].key == NULL)
 635                         continue;
 636
 637                 switch (metrics[i].ds_type) {
 638                         case DS_TYPE_COUNTER:
 639                                 counter_submit(metrics[i].type, key, (counter_t)val, db);
 640                                 break;
 641                         case DS_TYPE_GAUGE:
 642                                 gauge_submit(metrics[i].type, key, (gauge_t)val, db);
 643                                 break;
 644                         case DS_TYPE_DERIVE:
 645                                 derive_submit(metrics[i].type, key, (derive_t)val, db);
 646                                 break;
 647                 }
 648         }
 649
 650         mysql_free_result(res);
 651         return (0);
 652 }
 653
 654 static int mysql_read (user_data_t *ud)
 655 {
 656         mysql_database_t *db;
 657         MYSQL      *con;
 658         MYSQL_RES  *res;
 659         MYSQL_ROW   row;
 660         const char *query;
 661
 662         derive_t qcache_hits          = 0;
 663         derive_t qcache_inserts       = 0;
 664         derive_t qcache_not_cached    = 0;
 665         derive_t qcache_lowmem_prunes = 0;
 666         gauge_t qcache_queries_in_cache = NAN;
 667
 668         gauge_t threads_running   = NAN;
 669         gauge_t threads_connected = NAN;
 670         gauge_t threads_cached    = NAN;
 671         derive_t threads_created = 0;
 672
 673         unsigned long long traffic_incoming = 0ULL;
 674         unsigned long long traffic_outgoing = 0ULL;
 675         unsigned long mysql_version = 0ULL;
 676
 677         if ((ud == NULL) || (ud->data == NULL))
 678         {
 679                 ERROR ("mysql plugin: mysql_database_read: Invalid user data.");
 680                 return (-1);
 681         }
 682
 683         db = (mysql_database_t *) ud->data;
 684
 685         /* An error message will have been printed in this case */
 686         if ((con = getconnection (db)) == NULL)
 687                 return (-1);
 688
 689         mysql_version = mysql_get_server_version(con);
 690
 691         query = "SHOW STATUS";
 692         if (mysql_version >= 50002)
 693                 query = "SHOW GLOBAL STATUS";
 694
 695         res = exec_query (con, query);
 696         if (res == NULL)
 697                 return (-1);
 698
 699         while ((row = mysql_fetch_row (res)))
 700         {
 701                 char *key;
 702                 unsigned long long val;
 703
 704                 key = row[0];
 705                 val = atoll (row[1]);
 706
 707                 if (strncmp (key, "Com_",
 708                                   strlen ("Com_")) == 0)
 709                 {
 710                         if (val == 0ULL)
 711                                 continue;
 712
 713                         /* Ignore `prepared statements' */
 714                         if (strncmp (key, "Com_stmt_", strlen ("Com_stmt_")) != 0)
 715                                 counter_submit ("mysql_commands",
 716                                                 key + strlen ("Com_"),
 717                                                 val, db);
 718                 }
 719                 else if (strncmp (key, "Handler_",
 720                                         strlen ("Handler_")) == 0)
 721                 {
 722                         if (val == 0ULL)
 723                                 continue;
 724
 725                         counter_submit ("mysql_handler",
 726                                         key + strlen ("Handler_"),
 727                                         val, db);
 728                 }
 729                 else if (strncmp (key, "Qcache_",
 730                                         strlen ("Qcache_")) == 0)
 731                 {
 732                         if (strcmp (key, "Qcache_hits") == 0)
 733                                 qcache_hits = (derive_t) val;
 734                         else if (strcmp (key, "Qcache_inserts") == 0)
 735                                 qcache_inserts = (derive_t) val;
 736                         else if (strcmp (key, "Qcache_not_cached") == 0)
 737                                 qcache_not_cached = (derive_t) val;
 738                         else if (strcmp (key, "Qcache_lowmem_prunes") == 0)
 739                                 qcache_lowmem_prunes = (derive_t) val;
 740                         else if (strcmp (key, "Qcache_queries_in_cache") == 0)
 741                                 qcache_queries_in_cache = (gauge_t) val;
 742                 }
 743                 else if (strncmp (key, "Bytes_",
 744                                         strlen ("Bytes_")) == 0)
 745                 {
 746                         if (strcmp (key, "Bytes_received") == 0)
 747                                 traffic_incoming += val;
 748                         else if (strcmp (key, "Bytes_sent") == 0)
 749                                 traffic_outgoing += val;
 750                 }
 751                 else if (strncmp (key, "Threads_",
 752                                         strlen ("Threads_")) == 0)
 753                 {
 754                         if (strcmp (key, "Threads_running") == 0)
 755                                 threads_running = (gauge_t) val;
 756                         else if (strcmp (key, "Threads_connected") == 0)
 757                                 threads_connected = (gauge_t) val;
 758                         else if (strcmp (key, "Threads_cached") == 0)
 759                                 threads_cached = (gauge_t) val;
 760                         else if (strcmp (key, "Threads_created") == 0)
 761                                 threads_created = (derive_t) val;
 762                 }
 763                 else if (strncmp (key, "Table_locks_",
 764                                         strlen ("Table_locks_")) == 0)
 765                 {
 766                         counter_submit ("mysql_locks",
 767                                         key + strlen ("Table_locks_"),
 768                                         val, db);
 769                 }
 770                 else if (db->innodb_stats && strncmp (key, "Innodb_", strlen ("Innodb_")) == 0)
 771                 {
 772                         /* buffer pool */
 773                         if (strcmp (key, "Innodb_buffer_pool_pages_data") == 0)
 774                                 gauge_submit ("mysql_bpool_pages", "data", val, db);
 775                         else if (strcmp (key, "Innodb_buffer_pool_pages_dirty") == 0)
 776                                 gauge_submit ("mysql_bpool_pages", "dirty", val, db);
 777                         else if (strcmp (key, "Innodb_buffer_pool_pages_flushed") == 0)
 778                                 counter_submit ("mysql_bpool_counters", "pages_flushed", val, db);
 779                         else if (strcmp (key, "Innodb_buffer_pool_pages_free") == 0)
 780                                 gauge_submit ("mysql_bpool_pages", "free", val, db);
 781                         else if (strcmp (key, "Innodb_buffer_pool_pages_misc") == 0)
 782                                 gauge_submit ("mysql_bpool_pages", "misc", val, db);
 783                         else if (strcmp (key, "Innodb_buffer_pool_pages_total") == 0)
 784                                 gauge_submit ("mysql_bpool_pages", "total", val, db);
 785                         else if (strcmp (key, "Innodb_buffer_pool_read_ahead_rnd") == 0)
 786                                 counter_submit ("mysql_bpool_counters", "read_ahead_rnd", val, db);
 787                         else if (strcmp (key, "Innodb_buffer_pool_read_ahead") == 0)
 788                                 counter_submit ("mysql_bpool_counters", "read_ahead", val, db);
 789                         else if (strcmp (key, "Innodb_buffer_pool_read_ahead_evicted") == 0)
 790                                 counter_submit ("mysql_bpool_counters", "read_ahead_evicted", val, db);
 791                         else if (strcmp (key, "Innodb_buffer_pool_read_requests") == 0)
 792                                 counter_submit ("mysql_bpool_counters", "read_requests", val, db);
 793                         else if (strcmp (key, "Innodb_buffer_pool_reads") == 0)
 794                                 counter_submit ("mysql_bpool_counters", "reads", val, db);
 795                         else if (strcmp (key, "Innodb_buffer_pool_wait_free") == 0)
 796                                 counter_submit ("mysql_bpool_counters", "wait_free", val, db);
 797                         else if (strcmp (key, "Innodb_buffer_pool_write_requests") == 0)
 798                                 counter_submit ("mysql_bpool_counters", "write_requests", val, db);
 799                         else if (strcmp (key, "Innodb_buffer_pool_bytes_data") == 0)
 800                                 gauge_submit ("mysql_bpool_bytes", "data", val, db);
 801                         else if (strcmp (key, "Innodb_buffer_pool_bytes_dirty") == 0)
 802                                 gauge_submit ("mysql_bpool_bytes", "dirty", val, db);
 803
 804                         /* data */
 805                         if (strcmp (key, "Innodb_data_fsyncs") == 0)
 806                                 counter_submit ("mysql_innodb_data", "fsyncs", val, db);
 807                         else if (strcmp (key, "Innodb_data_read") == 0)
 808                                 counter_submit ("mysql_innodb_data", "read", val, db);
 809                         else if (strcmp (key, "Innodb_data_reads") == 0)
 810                                 counter_submit ("mysql_innodb_data", "reads", val, db);
 811                         else if (strcmp (key, "Innodb_data_writes") == 0)
 812                                 counter_submit ("mysql_innodb_data", "writes", val, db);
 813                         else if (strcmp (key, "Innodb_data_written") == 0)
 814                                 counter_submit ("mysql_innodb_data", "written", val, db);
 815
 816                         /* double write */
 817                         else if (strcmp (key, "Innodb_dblwr_writes") == 0)
 818                                 counter_submit ("mysql_innodb_dblwr", "writes", val, db);
 819                         else if (strcmp (key, "Innodb_dblwr_pages_written") == 0)
 820                                 counter_submit ("mysql_innodb_dblwr", "written", val, db);
 821                         else if (strcmp (key, "Innodb_dblwr_page_size") == 0)
 822                                 gauge_submit ("mysql_innodb_dblwr", "page_size", val, db);
 823
 824                         /* log */
 825                         else if (strcmp (key, "Innodb_log_waits") == 0)
 826                                 counter_submit ("mysql_innodb_log", "waits", val, db);
 827                         else if (strcmp (key, "Innodb_log_write_requests") == 0)
 828                                 counter_submit ("mysql_innodb_log", "write_requests", val, db);
 829                         else if (strcmp (key, "Innodb_log_writes") == 0)
 830                                 counter_submit ("mysql_innodb_log", "writes", val, db);
 831                         else if (strcmp (key, "Innodb_os_log_fsyncs") == 0)
 832                                 counter_submit ("mysql_innodb_log", "fsyncs", val, db);
 833                         else if (strcmp (key, "Innodb_os_log_written") == 0)
 834                                 counter_submit ("mysql_innodb_log", "written", val, db);
 835
 836                         /* pages */
 837                         else if (strcmp (key, "Innodb_pages_created") == 0)
 838                                 counter_submit ("mysql_innodb_pages", "created", val, db);
 839                         else if (strcmp (key, "Innodb_pages_read") == 0)
 840                                 counter_submit ("mysql_innodb_pages", "read", val, db);
 841                         else if (strcmp (key, "Innodb_pages_written") == 0)
 842                                 counter_submit ("mysql_innodb_pages", "written", val, db);
 843
 844                         /* row lock */
 845                         else if (strcmp (key, "Innodb_row_lock_time") == 0)
 846                                 counter_submit ("mysql_innodb_row_lock", "time", val, db);
 847                         else if (strcmp (key, "Innodb_row_lock_waits") == 0)
 848                                 counter_submit ("mysql_innodb_row_lock", "waits", val, db);
 849
 850                         /* rows */
 851                         else if (strcmp (key, "Innodb_rows_deleted") == 0)
 852                                 counter_submit ("mysql_innodb_rows", "deleted", val, db);
 853                         else if (strcmp (key, "Innodb_rows_inserted") == 0)
 854                                 counter_submit ("mysql_innodb_rows", "inserted", val, db);
 855                         else if (strcmp (key, "Innodb_rows_read") == 0)
 856                                 counter_submit ("mysql_innodb_rows", "read", val, db);
 857                         else if (strcmp (key, "Innodb_rows_updated") == 0)
 858                                 counter_submit ("mysql_innodb_rows", "updated", val, db);
 859                 }
 860                 else if (strncmp (key, "Select_", strlen ("Select_")) == 0)
 861                 {
 862                         counter_submit ("mysql_select", key + strlen ("Select_"),
 863                                         val, db);
 864                 }
 865                 else if (strncmp (key, "Sort_", strlen ("Sort_")) == 0)
 866                 {
 867                         if (strcmp (key, "Sort_merge_passes") == 0)
 868                                 counter_submit ("mysql_sort_merge_passes", NULL, val, db);
 869                         else if (strcmp (key, "Sort_rows") == 0)
 870                                 counter_submit ("mysql_sort_rows", NULL, val, db);
 871                         else if (strcmp (key, "Sort_range") == 0)
 872                                 counter_submit ("mysql_sort", "range", val, db);
 873                         else if (strcmp (key, "Sort_scan") == 0)
 874                                 counter_submit ("mysql_sort", "scan", val, db);
 875
 876                 }
 877                 else if (strncmp (key, "Slow_queries", strlen ("Slow_queries")) == 0)
 878                 {
 879                         counter_submit ("mysql_slow_queries", NULL , val, db);
 880                 }
 881         }
 882         mysql_free_result (res); res = NULL;
 883
 884         if ((qcache_hits != 0)
 885                         || (qcache_inserts != 0)
 886                         || (qcache_not_cached != 0)
 887                         || (qcache_lowmem_prunes != 0))
 888         {
 889                 derive_submit ("cache_result", "qcache-hits",
 890                                 qcache_hits, db);
 891                 derive_submit ("cache_result", "qcache-inserts",
 892                                 qcache_inserts, db);
 893                 derive_submit ("cache_result", "qcache-not_cached",
 894                                 qcache_not_cached, db);
 895                 derive_submit ("cache_result", "qcache-prunes",
 896                                 qcache_lowmem_prunes, db);
 897
 898                 gauge_submit ("cache_size", "qcache",
 899                                 qcache_queries_in_cache, db);
 900         }
 901
 902         if (threads_created != 0)
 903         {
 904                 gauge_submit ("threads", "running",
 905                                 threads_running, db);
 906                 gauge_submit ("threads", "connected",
 907                                 threads_connected, db);
 908                 gauge_submit ("threads", "cached",
 909                                 threads_cached, db);
 910
 911                 derive_submit ("total_threads", "created",
 912                                 threads_created, db);
 913         }
 914
 915         traffic_submit  (traffic_incoming, traffic_outgoing, db);
 916
 917         if (mysql_version >= 50600 && db->innodb_stats)
 918                 mysql_read_innodb_stats (db, con);
 919
 920         if (db->master_stats)
 921                 mysql_read_master_stats (db, con);
 922
 923         if ((db->slave_stats) || (db->slave_notif))
 924                 mysql_read_slave_stats (db, con);
 925
 926         return (0);
 927 } /* int mysql_read */
 928
 929 void module_register (void)
 930 {
 931         plugin_register_complex_config ("mysql", mysql_config);
 932 } /* void module_register */