ovsdb/jsonrpc-server.c

   1 /* Copyright (c) 2009, 2010, 2011 Nicira Networks
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <config.h>
  17
  18 #include "jsonrpc-server.h"
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22
  23 #include "bitmap.h"
  24 #include "column.h"
  25 #include "dynamic-string.h"
  26 #include "json.h"
  27 #include "jsonrpc.h"
  28 #include "ovsdb-error.h"
  29 #include "ovsdb-parser.h"
  30 #include "ovsdb.h"
  31 #include "reconnect.h"
  32 #include "row.h"
  33 #include "server.h"
  34 #include "stream.h"
  35 #include "table.h"
  36 #include "timeval.h"
  37 #include "transaction.h"
  38 #include "trigger.h"
  39 #include "vlog.h"
  40
  41 VLOG_DEFINE_THIS_MODULE(ovsdb_jsonrpc_server);
  42
  43 struct ovsdb_jsonrpc_remote;
  44 struct ovsdb_jsonrpc_session;
  45
  46 /* Message rate-limiting. */
  47 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  48
  49 /* Sessions. */
  50 static struct ovsdb_jsonrpc_session *ovsdb_jsonrpc_session_create(
  51     struct ovsdb_jsonrpc_remote *, struct jsonrpc_session *);
  52 static void ovsdb_jsonrpc_session_run_all(struct ovsdb_jsonrpc_remote *);
  53 static void ovsdb_jsonrpc_session_wait_all(struct ovsdb_jsonrpc_remote *);
  54 static void ovsdb_jsonrpc_session_close_all(struct ovsdb_jsonrpc_remote *);
  55 static void ovsdb_jsonrpc_session_reconnect_all(struct ovsdb_jsonrpc_remote *);
  56 static void ovsdb_jsonrpc_session_set_all_options(
  57     struct ovsdb_jsonrpc_remote *, const struct ovsdb_jsonrpc_options *);
  58 static bool ovsdb_jsonrpc_session_get_status(
  59     const struct ovsdb_jsonrpc_remote *,
  60     struct ovsdb_jsonrpc_remote_status *);
  61
  62 /* Triggers. */
  63 static void ovsdb_jsonrpc_trigger_create(struct ovsdb_jsonrpc_session *,
  64                                          struct json *id, struct json *params);
  65 static struct ovsdb_jsonrpc_trigger *ovsdb_jsonrpc_trigger_find(
  66     struct ovsdb_jsonrpc_session *, const struct json *id, size_t hash);
  67 static void ovsdb_jsonrpc_trigger_complete(struct ovsdb_jsonrpc_trigger *);
  68 static void ovsdb_jsonrpc_trigger_complete_all(struct ovsdb_jsonrpc_session *);
  69 static void ovsdb_jsonrpc_trigger_complete_done(
  70     struct ovsdb_jsonrpc_session *);
  71
  72 /* Monitors. */
  73 static struct json *ovsdb_jsonrpc_monitor_create(
  74     struct ovsdb_jsonrpc_session *, struct json *params);
  75 static struct jsonrpc_msg *ovsdb_jsonrpc_monitor_cancel(
  76     struct ovsdb_jsonrpc_session *,
  77     struct json_array *params,
  78     const struct json *request_id);
  79 static void ovsdb_jsonrpc_monitor_remove_all(struct ovsdb_jsonrpc_session *);
  80 \f
  81 /* JSON-RPC database server. */
  82
  83 struct ovsdb_jsonrpc_server {
  84     struct ovsdb_server up;
  85     unsigned int n_sessions, max_sessions;
  86     struct shash remotes;      /* Contains "struct ovsdb_jsonrpc_remote *"s. */
  87 };
  88
  89 /* A configured remote.  This is either a passive stream listener plus a list
  90  * of the currently connected sessions, or a list of exactly one active
  91  * session. */
  92 struct ovsdb_jsonrpc_remote {
  93     struct ovsdb_jsonrpc_server *server;
  94     struct pstream *listener;   /* Listener, if passive. */
  95     struct list sessions;       /* List of "struct ovsdb_jsonrpc_session"s. */
  96 };
  97
  98 static struct ovsdb_jsonrpc_remote *ovsdb_jsonrpc_server_add_remote(
  99     struct ovsdb_jsonrpc_server *, const char *name);
 100 static void ovsdb_jsonrpc_server_del_remote(struct shash_node *);
 101
 102 struct ovsdb_jsonrpc_server *
 103 ovsdb_jsonrpc_server_create(struct ovsdb *db)
 104 {
 105     struct ovsdb_jsonrpc_server *server = xzalloc(sizeof *server);
 106     ovsdb_server_init(&server->up, db);
 107     server->max_sessions = 64;
 108     shash_init(&server->remotes);
 109     return server;
 110 }
 111
 112 void
 113 ovsdb_jsonrpc_server_destroy(struct ovsdb_jsonrpc_server *svr)
 114 {
 115     struct shash_node *node, *next;
 116
 117     SHASH_FOR_EACH_SAFE (node, next, &svr->remotes) {
 118         ovsdb_jsonrpc_server_del_remote(node);
 119     }
 120     shash_destroy(&svr->remotes);
 121     ovsdb_server_destroy(&svr->up);
 122     free(svr);
 123 }
 124
 125 struct ovsdb_jsonrpc_options *
 126 ovsdb_jsonrpc_default_options(void)
 127 {
 128     struct ovsdb_jsonrpc_options *options = xzalloc(sizeof *options);
 129     options->probe_interval = RECONNECT_DEFAULT_PROBE_INTERVAL;
 130     options->max_backoff = RECONNECT_DEFAULT_MAX_BACKOFF;
 131     return options;
 132 }
 133
 134 /* Sets 'svr''s current set of remotes to the names in 'new_remotes', with
 135  * options in the struct ovsdb_jsonrpc_options supplied as the data values.
 136  *
 137  * A remote is an active or passive stream connection method, e.g. "pssl:" or
 138  * "tcp:1.2.3.4". */
 139 void
 140 ovsdb_jsonrpc_server_set_remotes(struct ovsdb_jsonrpc_server *svr,
 141                                  const struct shash *new_remotes)
 142 {
 143     struct shash_node *node, *next;
 144
 145     SHASH_FOR_EACH_SAFE (node, next, &svr->remotes) {
 146         if (!shash_find(new_remotes, node->name)) {
 147             VLOG_INFO("%s: remote deconfigured", node->name);
 148             ovsdb_jsonrpc_server_del_remote(node);
 149         }
 150     }
 151     SHASH_FOR_EACH (node, new_remotes) {
 152         const struct ovsdb_jsonrpc_options *options = node->data;
 153         struct ovsdb_jsonrpc_remote *remote;
 154
 155         remote = shash_find_data(&svr->remotes, node->name);
 156         if (!remote) {
 157             remote = ovsdb_jsonrpc_server_add_remote(svr, node->name);
 158             if (!remote) {
 159                 continue;
 160             }
 161         }
 162
 163         ovsdb_jsonrpc_session_set_all_options(remote, options);
 164     }
 165 }
 166
 167 static struct ovsdb_jsonrpc_remote *
 168 ovsdb_jsonrpc_server_add_remote(struct ovsdb_jsonrpc_server *svr,
 169                                 const char *name)
 170 {
 171     struct ovsdb_jsonrpc_remote *remote;
 172     struct pstream *listener;
 173     int error;
 174
 175     error = jsonrpc_pstream_open(name, &listener);
 176     if (error && error != EAFNOSUPPORT) {
 177         VLOG_ERR_RL(&rl, "%s: listen failed: %s", name, strerror(error));
 178         return NULL;
 179     }
 180
 181     remote = xmalloc(sizeof *remote);
 182     remote->server = svr;
 183     remote->listener = listener;
 184     list_init(&remote->sessions);
 185     shash_add(&svr->remotes, name, remote);
 186
 187     if (!listener) {
 188         ovsdb_jsonrpc_session_create(remote, jsonrpc_session_open(name));
 189     }
 190     return remote;
 191 }
 192
 193 static void
 194 ovsdb_jsonrpc_server_del_remote(struct shash_node *node)
 195 {
 196     struct ovsdb_jsonrpc_remote *remote = node->data;
 197
 198     ovsdb_jsonrpc_session_close_all(remote);
 199     pstream_close(remote->listener);
 200     shash_delete(&remote->server->remotes, node);
 201     free(remote);
 202 }
 203
 204 /* Stores status information for the remote named 'target', which should have
 205  * been configured on 'svr' with a call to ovsdb_jsonrpc_server_set_remotes(),
 206  * into '*status'.  On success returns true, on failure (if 'svr' doesn't have
 207  * a remote named 'target' or if that remote is an inbound remote that has no
 208  * active connections) returns false.  On failure, 'status' will be zeroed.
 209  */
 210 bool
 211 ovsdb_jsonrpc_server_get_remote_status(
 212     const struct ovsdb_jsonrpc_server *svr, const char *target,
 213     struct ovsdb_jsonrpc_remote_status *status)
 214 {
 215     const struct ovsdb_jsonrpc_remote *remote;
 216
 217     memset(status, 0, sizeof *status);
 218
 219     remote = shash_find_data(&svr->remotes, target);
 220     return remote && ovsdb_jsonrpc_session_get_status(remote, status);
 221 }
 222
 223 /* Forces all of the JSON-RPC sessions managed by 'svr' to disconnect and
 224  * reconnect. */
 225 void
 226 ovsdb_jsonrpc_server_reconnect(struct ovsdb_jsonrpc_server *svr)
 227 {
 228     struct shash_node *node;
 229
 230     SHASH_FOR_EACH (node, &svr->remotes) {
 231         struct ovsdb_jsonrpc_remote *remote = node->data;
 232
 233         ovsdb_jsonrpc_session_reconnect_all(remote);
 234     }
 235 }
 236
 237 void
 238 ovsdb_jsonrpc_server_run(struct ovsdb_jsonrpc_server *svr)
 239 {
 240     struct shash_node *node;
 241
 242     SHASH_FOR_EACH (node, &svr->remotes) {
 243         struct ovsdb_jsonrpc_remote *remote = node->data;
 244
 245         if (remote->listener && svr->n_sessions < svr->max_sessions) {
 246             struct stream *stream;
 247             int error;
 248
 249             error = pstream_accept(remote->listener, &stream);
 250             if (!error) {
 251                 struct jsonrpc_session *js;
 252                 js = jsonrpc_session_open_unreliably(jsonrpc_open(stream));
 253                 ovsdb_jsonrpc_session_create(remote, js);
 254             } else if (error != EAGAIN) {
 255                 VLOG_WARN_RL(&rl, "%s: accept failed: %s",
 256                              pstream_get_name(remote->listener),
 257                              strerror(error));
 258             }
 259         }
 260
 261         ovsdb_jsonrpc_session_run_all(remote);
 262     }
 263 }
 264
 265 void
 266 ovsdb_jsonrpc_server_wait(struct ovsdb_jsonrpc_server *svr)
 267 {
 268     struct shash_node *node;
 269
 270     SHASH_FOR_EACH (node, &svr->remotes) {
 271         struct ovsdb_jsonrpc_remote *remote = node->data;
 272
 273         if (remote->listener && svr->n_sessions < svr->max_sessions) {
 274             pstream_wait(remote->listener);
 275         }
 276
 277         ovsdb_jsonrpc_session_wait_all(remote);
 278     }
 279 }
 280 \f
 281 /* JSON-RPC database server session. */
 282
 283 struct ovsdb_jsonrpc_session {
 284     struct ovsdb_session up;
 285     struct ovsdb_jsonrpc_remote *remote;
 286     struct list node;           /* Element in remote's sessions list. */
 287
 288     /* Triggers. */
 289     struct hmap triggers;       /* Hmap of "struct ovsdb_jsonrpc_trigger"s. */
 290
 291     /* Monitors. */
 292     struct hmap monitors;       /* Hmap of "struct ovsdb_jsonrpc_monitor"s. */
 293
 294     /* Network connectivity. */
 295     struct jsonrpc_session *js;  /* JSON-RPC session. */
 296     unsigned int js_seqno;       /* Last jsonrpc_session_get_seqno() value. */
 297 };
 298
 299 static void ovsdb_jsonrpc_session_close(struct ovsdb_jsonrpc_session *);
 300 static int ovsdb_jsonrpc_session_run(struct ovsdb_jsonrpc_session *);
 301 static void ovsdb_jsonrpc_session_wait(struct ovsdb_jsonrpc_session *);
 302 static void ovsdb_jsonrpc_session_set_options(
 303     struct ovsdb_jsonrpc_session *, const struct ovsdb_jsonrpc_options *);
 304 static void ovsdb_jsonrpc_session_got_request(struct ovsdb_jsonrpc_session *,
 305                                              struct jsonrpc_msg *);
 306 static void ovsdb_jsonrpc_session_got_notify(struct ovsdb_jsonrpc_session *,
 307                                              struct jsonrpc_msg *);
 308
 309 static struct ovsdb_jsonrpc_session *
 310 ovsdb_jsonrpc_session_create(struct ovsdb_jsonrpc_remote *remote,
 311                              struct jsonrpc_session *js)
 312 {
 313     struct ovsdb_jsonrpc_session *s;
 314
 315     s = xzalloc(sizeof *s);
 316     ovsdb_session_init(&s->up, remote->server->up.db);
 317     s->remote = remote;
 318     list_push_back(&remote->sessions, &s->node);
 319     hmap_init(&s->triggers);
 320     hmap_init(&s->monitors);
 321     s->js = js;
 322     s->js_seqno = jsonrpc_session_get_seqno(js);
 323
 324     remote->server->n_sessions++;
 325
 326     return s;
 327 }
 328
 329 static void
 330 ovsdb_jsonrpc_session_close(struct ovsdb_jsonrpc_session *s)
 331 {
 332     ovsdb_jsonrpc_monitor_remove_all(s);
 333     jsonrpc_session_close(s->js);
 334     list_remove(&s->node);
 335     s->remote->server->n_sessions--;
 336     ovsdb_session_destroy(&s->up);
 337     free(s);
 338 }
 339
 340 static int
 341 ovsdb_jsonrpc_session_run(struct ovsdb_jsonrpc_session *s)
 342 {
 343     jsonrpc_session_run(s->js);
 344     if (s->js_seqno != jsonrpc_session_get_seqno(s->js)) {
 345         s->js_seqno = jsonrpc_session_get_seqno(s->js);
 346         ovsdb_jsonrpc_trigger_complete_all(s);
 347         ovsdb_jsonrpc_monitor_remove_all(s);
 348     }
 349
 350     ovsdb_jsonrpc_trigger_complete_done(s);
 351
 352     if (!jsonrpc_session_get_backlog(s->js)) {
 353         struct jsonrpc_msg *msg = jsonrpc_session_recv(s->js);
 354         if (msg) {
 355             if (msg->type == JSONRPC_REQUEST) {
 356                 ovsdb_jsonrpc_session_got_request(s, msg);
 357             } else if (msg->type == JSONRPC_NOTIFY) {
 358                 ovsdb_jsonrpc_session_got_notify(s, msg);
 359             } else {
 360                 VLOG_WARN("%s: received unexpected %s message",
 361                           jsonrpc_session_get_name(s->js),
 362                           jsonrpc_msg_type_to_string(msg->type));
 363                 jsonrpc_session_force_reconnect(s->js);
 364                 jsonrpc_msg_destroy(msg);
 365             }
 366         }
 367     }
 368     return jsonrpc_session_is_alive(s->js) ? 0 : ETIMEDOUT;
 369 }
 370
 371 static void
 372 ovsdb_jsonrpc_session_set_options(struct ovsdb_jsonrpc_session *session,
 373                                   const struct ovsdb_jsonrpc_options *options)
 374 {
 375     jsonrpc_session_set_max_backoff(session->js, options->max_backoff);
 376     jsonrpc_session_set_probe_interval(session->js, options->probe_interval);
 377 }
 378
 379 static void
 380 ovsdb_jsonrpc_session_run_all(struct ovsdb_jsonrpc_remote *remote)
 381 {
 382     struct ovsdb_jsonrpc_session *s, *next;
 383
 384     LIST_FOR_EACH_SAFE (s, next, node, &remote->sessions) {
 385         int error = ovsdb_jsonrpc_session_run(s);
 386         if (error) {
 387             ovsdb_jsonrpc_session_close(s);
 388         }
 389     }
 390 }
 391
 392 static void
 393 ovsdb_jsonrpc_session_wait(struct ovsdb_jsonrpc_session *s)
 394 {
 395     jsonrpc_session_wait(s->js);
 396     if (!jsonrpc_session_get_backlog(s->js)) {
 397         jsonrpc_session_recv_wait(s->js);
 398     }
 399 }
 400
 401 static void
 402 ovsdb_jsonrpc_session_wait_all(struct ovsdb_jsonrpc_remote *remote)
 403 {
 404     struct ovsdb_jsonrpc_session *s;
 405
 406     LIST_FOR_EACH (s, node, &remote->sessions) {
 407         ovsdb_jsonrpc_session_wait(s);
 408     }
 409 }
 410
 411 static void
 412 ovsdb_jsonrpc_session_close_all(struct ovsdb_jsonrpc_remote *remote)
 413 {
 414     struct ovsdb_jsonrpc_session *s, *next;
 415
 416     LIST_FOR_EACH_SAFE (s, next, node, &remote->sessions) {
 417         ovsdb_jsonrpc_session_close(s);
 418     }
 419 }
 420
 421 /* Forces all of the JSON-RPC sessions managed by 'remote' to disconnect and
 422  * reconnect. */
 423 static void
 424 ovsdb_jsonrpc_session_reconnect_all(struct ovsdb_jsonrpc_remote *remote)
 425 {
 426     struct ovsdb_jsonrpc_session *s, *next;
 427
 428     LIST_FOR_EACH_SAFE (s, next, node, &remote->sessions) {
 429         jsonrpc_session_force_reconnect(s->js);
 430         if (!jsonrpc_session_is_alive(s->js)) {
 431             ovsdb_jsonrpc_session_close(s);
 432         }
 433     }
 434 }
 435
 436 /* Sets the options for all of the JSON-RPC sessions managed by 'remote' to
 437  * 'options'. */
 438 static void
 439 ovsdb_jsonrpc_session_set_all_options(
 440     struct ovsdb_jsonrpc_remote *remote,
 441     const struct ovsdb_jsonrpc_options *options)
 442 {
 443     struct ovsdb_jsonrpc_session *s;
 444
 445     LIST_FOR_EACH (s, node, &remote->sessions) {
 446         ovsdb_jsonrpc_session_set_options(s, options);
 447     }
 448 }
 449
 450 static bool
 451 ovsdb_jsonrpc_session_get_status(const struct ovsdb_jsonrpc_remote *remote,
 452                                  struct ovsdb_jsonrpc_remote_status *status)
 453 {
 454     const struct ovsdb_jsonrpc_session *s;
 455     const struct jsonrpc_session *js;
 456     struct reconnect_stats rstats;
 457
 458     if (list_is_empty(&remote->sessions)) {
 459         return false;
 460     }
 461     s = CONTAINER_OF(remote->sessions.next, struct ovsdb_jsonrpc_session, node);
 462     js = s->js;
 463
 464     status->is_connected = jsonrpc_session_is_connected(js);
 465     status->last_error = jsonrpc_session_get_status(js);
 466
 467     jsonrpc_session_get_reconnect_stats(js, &rstats);
 468     status->state = rstats.state;
 469     status->sec_since_connect = rstats.msec_since_connect == UINT_MAX
 470         ? UINT_MAX : rstats.msec_since_connect / 1000;
 471     status->sec_since_disconnect = rstats.msec_since_disconnect == UINT_MAX
 472         ? UINT_MAX : rstats.msec_since_disconnect / 1000;
 473
 474     status->n_connections = list_size(&remote->sessions);
 475
 476     return true;
 477 }
 478
 479 static const char *
 480 get_db_name(const struct ovsdb_jsonrpc_session *s)
 481 {
 482     return s->remote->server->up.db->schema->name;
 483 }
 484
 485 static struct jsonrpc_msg *
 486 ovsdb_jsonrpc_check_db_name(const struct ovsdb_jsonrpc_session *s,
 487                             const struct jsonrpc_msg *request)
 488 {
 489     struct json_array *params;
 490     const char *want_db_name;
 491     const char *have_db_name;
 492     struct ovsdb_error *error;
 493     struct jsonrpc_msg *reply;
 494
 495     params = json_array(request->params);
 496     if (!params->n || params->elems[0]->type != JSON_STRING) {
 497         error = ovsdb_syntax_error(
 498             request->params, NULL,
 499             "%s request params must begin with <db-name>", request->method);
 500         goto error;
 501     }
 502
 503     want_db_name = params->elems[0]->u.string;
 504     have_db_name = get_db_name(s);
 505     if (strcmp(want_db_name, have_db_name)) {
 506         error = ovsdb_syntax_error(
 507             request->params, "unknown database",
 508             "%s request specifies unknown database %s",
 509             request->method, want_db_name);
 510         goto error;
 511     }
 512
 513     return NULL;
 514
 515 error:
 516     reply = jsonrpc_create_reply(ovsdb_error_to_json(error), request->id);
 517     ovsdb_error_destroy(error);
 518     return reply;
 519 }
 520
 521 static struct jsonrpc_msg *
 522 execute_transaction(struct ovsdb_jsonrpc_session *s,
 523                     struct jsonrpc_msg *request)
 524 {
 525     ovsdb_jsonrpc_trigger_create(s, request->id, request->params);
 526     request->id = NULL;
 527     request->params = NULL;
 528     jsonrpc_msg_destroy(request);
 529     return NULL;
 530 }
 531
 532 static void
 533 ovsdb_jsonrpc_session_got_request(struct ovsdb_jsonrpc_session *s,
 534                                   struct jsonrpc_msg *request)
 535 {
 536     struct jsonrpc_msg *reply;
 537
 538     if (!strcmp(request->method, "transact")) {
 539         reply = ovsdb_jsonrpc_check_db_name(s, request);
 540         if (!reply) {
 541             reply = execute_transaction(s, request);
 542         }
 543     } else if (!strcmp(request->method, "monitor")) {
 544         reply = ovsdb_jsonrpc_check_db_name(s, request);
 545         if (!reply) {
 546             reply = jsonrpc_create_reply(
 547                 ovsdb_jsonrpc_monitor_create(s, request->params), request->id);
 548         }
 549     } else if (!strcmp(request->method, "monitor_cancel")) {
 550         reply = ovsdb_jsonrpc_monitor_cancel(s, json_array(request->params),
 551                                              request->id);
 552     } else if (!strcmp(request->method, "get_schema")) {
 553         reply = ovsdb_jsonrpc_check_db_name(s, request);
 554         if (!reply) {
 555             reply = jsonrpc_create_reply(
 556                 ovsdb_schema_to_json(s->remote->server->up.db->schema),
 557                 request->id);
 558         }
 559     } else if (!strcmp(request->method, "list_dbs")) {
 560         reply = jsonrpc_create_reply(
 561             json_array_create_1(json_string_create(get_db_name(s))),
 562             request->id);
 563     } else if (!strcmp(request->method, "echo")) {
 564         reply = jsonrpc_create_reply(json_clone(request->params), request->id);
 565     } else {
 566         reply = jsonrpc_create_error(json_string_create("unknown method"),
 567                                      request->id);
 568     }
 569
 570     if (reply) {
 571         jsonrpc_msg_destroy(request);
 572         jsonrpc_session_send(s->js, reply);
 573     }
 574 }
 575
 576 static void
 577 execute_cancel(struct ovsdb_jsonrpc_session *s, struct jsonrpc_msg *request)
 578 {
 579     if (json_array(request->params)->n == 1) {
 580         struct ovsdb_jsonrpc_trigger *t;
 581         struct json *id;
 582
 583         id = request->params->u.array.elems[0];
 584         t = ovsdb_jsonrpc_trigger_find(s, id, json_hash(id, 0));
 585         if (t) {
 586             ovsdb_jsonrpc_trigger_complete(t);
 587         }
 588     }
 589 }
 590
 591 static void
 592 ovsdb_jsonrpc_session_got_notify(struct ovsdb_jsonrpc_session *s,
 593                                  struct jsonrpc_msg *request)
 594 {
 595     if (!strcmp(request->method, "cancel")) {
 596         execute_cancel(s, request);
 597     }
 598     jsonrpc_msg_destroy(request);
 599 }
 600 \f
 601 /* JSON-RPC database server triggers.
 602  *
 603  * (Every transaction is treated as a trigger even if it doesn't actually have
 604  * any "wait" operations.) */
 605
 606 struct ovsdb_jsonrpc_trigger {
 607     struct ovsdb_trigger trigger;
 608     struct hmap_node hmap_node; /* In session's "triggers" hmap. */
 609     struct json *id;
 610 };
 611
 612 static void
 613 ovsdb_jsonrpc_trigger_create(struct ovsdb_jsonrpc_session *s,
 614                              struct json *id, struct json *params)
 615 {
 616     struct ovsdb_jsonrpc_trigger *t;
 617     size_t hash;
 618
 619     /* Check for duplicate ID. */
 620     hash = json_hash(id, 0);
 621     t = ovsdb_jsonrpc_trigger_find(s, id, hash);
 622     if (t) {
 623         struct jsonrpc_msg *msg;
 624
 625         msg = jsonrpc_create_error(json_string_create("duplicate request ID"),
 626                                    id);
 627         jsonrpc_session_send(s->js, msg);
 628         json_destroy(id);
 629         json_destroy(params);
 630         return;
 631     }
 632
 633     /* Insert into trigger table. */
 634     t = xmalloc(sizeof *t);
 635     ovsdb_trigger_init(&s->up, &t->trigger, params, time_msec());
 636     t->id = id;
 637     hmap_insert(&s->triggers, &t->hmap_node, hash);
 638
 639     /* Complete early if possible. */
 640     if (ovsdb_trigger_is_complete(&t->trigger)) {
 641         ovsdb_jsonrpc_trigger_complete(t);
 642     }
 643 }
 644
 645 static struct ovsdb_jsonrpc_trigger *
 646 ovsdb_jsonrpc_trigger_find(struct ovsdb_jsonrpc_session *s,
 647                            const struct json *id, size_t hash)
 648 {
 649     struct ovsdb_jsonrpc_trigger *t;
 650
 651     HMAP_FOR_EACH_WITH_HASH (t, hmap_node, hash, &s->triggers) {
 652         if (json_equal(t->id, id)) {
 653             return t;
 654         }
 655     }
 656
 657     return NULL;
 658 }
 659
 660 static void
 661 ovsdb_jsonrpc_trigger_complete(struct ovsdb_jsonrpc_trigger *t)
 662 {
 663     struct ovsdb_jsonrpc_session *s;
 664
 665     s = CONTAINER_OF(t->trigger.session, struct ovsdb_jsonrpc_session, up);
 666
 667     if (jsonrpc_session_is_connected(s->js)) {
 668         struct jsonrpc_msg *reply;
 669         struct json *result;
 670
 671         result = ovsdb_trigger_steal_result(&t->trigger);
 672         if (result) {
 673             reply = jsonrpc_create_reply(result, t->id);
 674         } else {
 675             reply = jsonrpc_create_error(json_string_create("canceled"),
 676                                          t->id);
 677         }
 678         jsonrpc_session_send(s->js, reply);
 679     }
 680
 681     json_destroy(t->id);
 682     ovsdb_trigger_destroy(&t->trigger);
 683     hmap_remove(&s->triggers, &t->hmap_node);
 684     free(t);
 685 }
 686
 687 static void
 688 ovsdb_jsonrpc_trigger_complete_all(struct ovsdb_jsonrpc_session *s)
 689 {
 690     struct ovsdb_jsonrpc_trigger *t, *next;
 691     HMAP_FOR_EACH_SAFE (t, next, hmap_node, &s->triggers) {
 692         ovsdb_jsonrpc_trigger_complete(t);
 693     }
 694 }
 695
 696 static void
 697 ovsdb_jsonrpc_trigger_complete_done(struct ovsdb_jsonrpc_session *s)
 698 {
 699     while (!list_is_empty(&s->up.completions)) {
 700         struct ovsdb_jsonrpc_trigger *t
 701             = CONTAINER_OF(s->up.completions.next,
 702                            struct ovsdb_jsonrpc_trigger, trigger.node);
 703         ovsdb_jsonrpc_trigger_complete(t);
 704     }
 705 }
 706 \f
 707 /* JSON-RPC database table monitors. */
 708
 709 enum ovsdb_jsonrpc_monitor_selection {
 710     OJMS_INITIAL = 1 << 0,      /* All rows when monitor is created. */
 711     OJMS_INSERT = 1 << 1,       /* New rows. */
 712     OJMS_DELETE = 1 << 2,       /* Deleted rows. */
 713     OJMS_MODIFY = 1 << 3        /* Modified rows. */
 714 };
 715
 716 /* A particular column being monitored. */
 717 struct ovsdb_jsonrpc_monitor_column {
 718     const struct ovsdb_column *column;
 719     enum ovsdb_jsonrpc_monitor_selection select;
 720 };
 721
 722 /* A particular table being monitored. */
 723 struct ovsdb_jsonrpc_monitor_table {
 724     const struct ovsdb_table *table;
 725
 726     /* This is the union (bitwise-OR) of the 'select' values in all of the
 727      * members of 'columns' below. */
 728     enum ovsdb_jsonrpc_monitor_selection select;
 729
 730     /* Columns being monitored. */
 731     struct ovsdb_jsonrpc_monitor_column *columns;
 732     size_t n_columns;
 733 };
 734
 735 /* A collection of tables being monitored. */
 736 struct ovsdb_jsonrpc_monitor {
 737     struct ovsdb_replica replica;
 738     struct ovsdb_jsonrpc_session *session;
 739     struct hmap_node node;      /* In ovsdb_jsonrpc_session's "monitors". */
 740
 741     struct json *monitor_id;
 742     struct shash tables;     /* Holds "struct ovsdb_jsonrpc_monitor_table"s. */
 743 };
 744
 745 static const struct ovsdb_replica_class ovsdb_jsonrpc_replica_class;
 746
 747 struct ovsdb_jsonrpc_monitor *ovsdb_jsonrpc_monitor_find(
 748     struct ovsdb_jsonrpc_session *, const struct json *monitor_id);
 749 static void ovsdb_jsonrpc_monitor_destroy(struct ovsdb_replica *);
 750 static struct json *ovsdb_jsonrpc_monitor_get_initial(
 751     const struct ovsdb_jsonrpc_monitor *);
 752
 753 static bool
 754 parse_bool(struct ovsdb_parser *parser, const char *name, bool default_value)
 755 {
 756     const struct json *json;
 757
 758     json = ovsdb_parser_member(parser, name, OP_BOOLEAN | OP_OPTIONAL);
 759     return json ? json_boolean(json) : default_value;
 760 }
 761
 762 struct ovsdb_jsonrpc_monitor *
 763 ovsdb_jsonrpc_monitor_find(struct ovsdb_jsonrpc_session *s,
 764                            const struct json *monitor_id)
 765 {
 766     struct ovsdb_jsonrpc_monitor *m;
 767
 768     HMAP_FOR_EACH_WITH_HASH (m, node, json_hash(monitor_id, 0), &s->monitors) {
 769         if (json_equal(m->monitor_id, monitor_id)) {
 770             return m;
 771         }
 772     }
 773
 774     return NULL;
 775 }
 776
 777 static void
 778 ovsdb_jsonrpc_add_monitor_column(struct ovsdb_jsonrpc_monitor_table *mt,
 779                                  const struct ovsdb_column *column,
 780                                  enum ovsdb_jsonrpc_monitor_selection select,
 781                                  size_t *allocated_columns)
 782 {
 783     struct ovsdb_jsonrpc_monitor_column *c;
 784
 785     if (mt->n_columns >= *allocated_columns) {
 786         mt->columns = x2nrealloc(mt->columns, allocated_columns,
 787                                  sizeof *mt->columns);
 788     }
 789
 790     c = &mt->columns[mt->n_columns++];
 791     c->column = column;
 792     c->select = select;
 793 }
 794
 795 static int
 796 compare_ovsdb_jsonrpc_monitor_column(const void *a_, const void *b_)
 797 {
 798     const struct ovsdb_jsonrpc_monitor_column *a = a_;
 799     const struct ovsdb_jsonrpc_monitor_column *b = b_;
 800
 801     return a->column < b->column ? -1 : a->column > b->column;
 802 }
 803
 804 static struct ovsdb_error * WARN_UNUSED_RESULT
 805 ovsdb_jsonrpc_parse_monitor_request(struct ovsdb_jsonrpc_monitor_table *mt,
 806                                     const struct json *monitor_request,
 807                                     size_t *allocated_columns)
 808 {
 809     const struct ovsdb_table_schema *ts = mt->table->schema;
 810     enum ovsdb_jsonrpc_monitor_selection select;
 811     const struct json *columns, *select_json;
 812     struct ovsdb_parser parser;
 813     struct ovsdb_error *error;
 814
 815     ovsdb_parser_init(&parser, monitor_request, "table %s", ts->name);
 816     columns = ovsdb_parser_member(&parser, "columns", OP_ARRAY | OP_OPTIONAL);
 817     select_json = ovsdb_parser_member(&parser, "select",
 818                                       OP_OBJECT | OP_OPTIONAL);
 819     error = ovsdb_parser_finish(&parser);
 820     if (error) {
 821         return error;
 822     }
 823
 824     if (select_json) {
 825         select = 0;
 826         ovsdb_parser_init(&parser, select_json, "table %s select", ts->name);
 827         if (parse_bool(&parser, "initial", true)) {
 828             select |= OJMS_INITIAL;
 829         }
 830         if (parse_bool(&parser, "insert", true)) {
 831             select |= OJMS_INSERT;
 832         }
 833         if (parse_bool(&parser, "delete", true)) {
 834             select |= OJMS_DELETE;
 835         }
 836         if (parse_bool(&parser, "modify", true)) {
 837             select |= OJMS_MODIFY;
 838         }
 839         error = ovsdb_parser_finish(&parser);
 840         if (error) {
 841             return error;
 842         }
 843     } else {
 844         select = OJMS_INITIAL | OJMS_INSERT | OJMS_DELETE | OJMS_MODIFY;
 845     }
 846     mt->select |= select;
 847
 848     if (columns) {
 849         size_t i;
 850
 851         if (columns->type != JSON_ARRAY) {
 852             return ovsdb_syntax_error(columns, NULL,
 853                                       "array of column names expected");
 854         }
 855
 856         for (i = 0; i < columns->u.array.n; i++) {
 857             const struct ovsdb_column *column;
 858             const char *s;
 859
 860             if (columns->u.array.elems[i]->type != JSON_STRING) {
 861                 return ovsdb_syntax_error(columns, NULL,
 862                                           "array of column names expected");
 863             }
 864
 865             s = columns->u.array.elems[i]->u.string;
 866             column = shash_find_data(&mt->table->schema->columns, s);
 867             if (!column) {
 868                 return ovsdb_syntax_error(columns, NULL, "%s is not a valid "
 869                                           "column name", s);
 870             }
 871             ovsdb_jsonrpc_add_monitor_column(mt, column, select,
 872                                              allocated_columns);
 873         }
 874     } else {
 875         struct shash_node *node;
 876
 877         SHASH_FOR_EACH (node, &ts->columns) {
 878             const struct ovsdb_column *column = node->data;
 879             if (column->index != OVSDB_COL_UUID) {
 880                 ovsdb_jsonrpc_add_monitor_column(mt, column, select,
 881                                                  allocated_columns);
 882             }
 883         }
 884     }
 885
 886     return NULL;
 887 }
 888
 889 static struct json *
 890 ovsdb_jsonrpc_monitor_create(struct ovsdb_jsonrpc_session *s,
 891                              struct json *params)
 892 {
 893     struct ovsdb_jsonrpc_monitor *m = NULL;
 894     struct json *monitor_id, *monitor_requests;
 895     struct ovsdb_error *error = NULL;
 896     struct shash_node *node;
 897     struct json *json;
 898
 899     if (json_array(params)->n != 3) {
 900         error = ovsdb_syntax_error(params, NULL, "invalid parameters");
 901         goto error;
 902     }
 903     monitor_id = params->u.array.elems[1];
 904     monitor_requests = params->u.array.elems[2];
 905     if (monitor_requests->type != JSON_OBJECT) {
 906         error = ovsdb_syntax_error(monitor_requests, NULL,
 907                                    "monitor-requests must be object");
 908         goto error;
 909     }
 910
 911     if (ovsdb_jsonrpc_monitor_find(s, monitor_id)) {
 912         error = ovsdb_syntax_error(monitor_id, NULL, "duplicate monitor ID");
 913         goto error;
 914     }
 915
 916     m = xzalloc(sizeof *m);
 917     ovsdb_replica_init(&m->replica, &ovsdb_jsonrpc_replica_class);
 918     ovsdb_add_replica(s->remote->server->up.db, &m->replica);
 919     m->session = s;
 920     hmap_insert(&s->monitors, &m->node, json_hash(monitor_id, 0));
 921     m->monitor_id = json_clone(monitor_id);
 922     shash_init(&m->tables);
 923
 924     SHASH_FOR_EACH (node, json_object(monitor_requests)) {
 925         const struct ovsdb_table *table;
 926         struct ovsdb_jsonrpc_monitor_table *mt;
 927         size_t allocated_columns;
 928         const struct json *mr_value;
 929         size_t i;
 930
 931         table = ovsdb_get_table(s->remote->server->up.db, node->name);
 932         if (!table) {
 933             error = ovsdb_syntax_error(NULL, NULL,
 934                                        "no table named %s", node->name);
 935             goto error;
 936         }
 937
 938         mt = xzalloc(sizeof *mt);
 939         mt->table = table;
 940         shash_add(&m->tables, table->schema->name, mt);
 941
 942         /* Parse columns. */
 943         mr_value = node->data;
 944         allocated_columns = 0;
 945         if (mr_value->type == JSON_ARRAY) {
 946             const struct json_array *array = &mr_value->u.array;
 947
 948             for (i = 0; i < array->n; i++) {
 949                 error = ovsdb_jsonrpc_parse_monitor_request(
 950                     mt, array->elems[i], &allocated_columns);
 951                 if (error) {
 952                     goto error;
 953                 }
 954             }
 955         } else {
 956             error = ovsdb_jsonrpc_parse_monitor_request(
 957                 mt, mr_value, &allocated_columns);
 958             if (error) {
 959                 goto error;
 960             }
 961         }
 962
 963         /* Check for duplicate columns. */
 964         qsort(mt->columns, mt->n_columns, sizeof *mt->columns,
 965               compare_ovsdb_jsonrpc_monitor_column);
 966         for (i = 1; i < mt->n_columns; i++) {
 967             if (mt->columns[i].column == mt->columns[i - 1].column) {
 968                 error = ovsdb_syntax_error(mr_value, NULL, "column %s "
 969                                            "mentioned more than once",
 970                                            mt->columns[i].column->name);
 971                 goto error;
 972             }
 973         }
 974     }
 975
 976     return ovsdb_jsonrpc_monitor_get_initial(m);
 977
 978 error:
 979     if (m) {
 980         ovsdb_remove_replica(s->remote->server->up.db, &m->replica);
 981     }
 982
 983     json = ovsdb_error_to_json(error);
 984     ovsdb_error_destroy(error);
 985     return json;
 986 }
 987
 988 static struct jsonrpc_msg *
 989 ovsdb_jsonrpc_monitor_cancel(struct ovsdb_jsonrpc_session *s,
 990                              struct json_array *params,
 991                              const struct json *request_id)
 992 {
 993     if (params->n != 1) {
 994         return jsonrpc_create_error(json_string_create("invalid parameters"),
 995                                     request_id);
 996     } else {
 997         struct ovsdb_jsonrpc_monitor *m;
 998
 999         m = ovsdb_jsonrpc_monitor_find(s, params->elems[0]);
1000         if (!m) {
1001             return jsonrpc_create_error(json_string_create("unknown monitor"),
1002                                         request_id);
1003         } else {
1004             ovsdb_remove_replica(s->remote->server->up.db, &m->replica);
1005             return jsonrpc_create_reply(json_object_create(), request_id);
1006         }
1007     }
1008 }
1009
1010 static void
1011 ovsdb_jsonrpc_monitor_remove_all(struct ovsdb_jsonrpc_session *s)
1012 {
1013     struct ovsdb_jsonrpc_monitor *m, *next;
1014
1015     HMAP_FOR_EACH_SAFE (m, next, node, &s->monitors) {
1016         ovsdb_remove_replica(s->remote->server->up.db, &m->replica);
1017     }
1018 }
1019
1020 static struct ovsdb_jsonrpc_monitor *
1021 ovsdb_jsonrpc_monitor_cast(struct ovsdb_replica *replica)
1022 {
1023     assert(replica->class == &ovsdb_jsonrpc_replica_class);
1024     return CONTAINER_OF(replica, struct ovsdb_jsonrpc_monitor, replica);
1025 }
1026
1027 struct ovsdb_jsonrpc_monitor_aux {
1028     bool initial;               /* Sending initial contents of table? */
1029     const struct ovsdb_jsonrpc_monitor *monitor;
1030     struct json *json;          /* JSON for the whole transaction. */
1031
1032     /* Current table.  */
1033     struct ovsdb_jsonrpc_monitor_table *mt;
1034     struct json *table_json;    /* JSON for table's transaction. */
1035 };
1036
1037 static bool
1038 any_reportable_change(const struct ovsdb_jsonrpc_monitor_table *mt,
1039                       const unsigned long int *changed)
1040 {
1041     size_t i;
1042
1043     for (i = 0; i < mt->n_columns; i++) {
1044         const struct ovsdb_jsonrpc_monitor_column *c = &mt->columns[i];
1045         unsigned int idx = c->column->index;
1046
1047         if (c->select & OJMS_MODIFY && bitmap_is_set(changed, idx)) {
1048             return true;
1049         }
1050     }
1051
1052     return false;
1053 }
1054
1055 static bool
1056 ovsdb_jsonrpc_monitor_change_cb(const struct ovsdb_row *old,
1057                                 const struct ovsdb_row *new,
1058                                 const unsigned long int *changed,
1059                                 void *aux_)
1060 {
1061     struct ovsdb_jsonrpc_monitor_aux *aux = aux_;
1062     const struct ovsdb_jsonrpc_monitor *m = aux->monitor;
1063     struct ovsdb_table *table = new ? new->table : old->table;
1064     enum ovsdb_jsonrpc_monitor_selection type;
1065     struct json *old_json, *new_json;
1066     struct json *row_json;
1067     char uuid[UUID_LEN + 1];
1068     size_t i;
1069
1070     if (!aux->mt || table != aux->mt->table) {
1071         aux->mt = shash_find_data(&m->tables, table->schema->name);
1072         aux->table_json = NULL;
1073         if (!aux->mt) {
1074             /* We don't care about rows in this table at all.  Tell the caller
1075              * to skip it.  */
1076             return false;
1077         }
1078     }
1079
1080     type = (aux->initial ? OJMS_INITIAL
1081             : !old ? OJMS_INSERT
1082             : !new ? OJMS_DELETE
1083             : OJMS_MODIFY);
1084     if (!(aux->mt->select & type)) {
1085         /* We don't care about this type of change (but do want to be called
1086          * back for changes to other rows in the same table). */
1087         return true;
1088     }
1089
1090     if (type == OJMS_MODIFY && !any_reportable_change(aux->mt, changed)) {
1091         /* Nothing of interest changed. */
1092         return true;
1093     }
1094
1095     old_json = new_json = NULL;
1096     if (type & (OJMS_DELETE | OJMS_MODIFY)) {
1097         old_json = json_object_create();
1098     }
1099     if (type & (OJMS_INITIAL | OJMS_INSERT | OJMS_MODIFY)) {
1100         new_json = json_object_create();
1101     }
1102     for (i = 0; i < aux->mt->n_columns; i++) {
1103         const struct ovsdb_jsonrpc_monitor_column *c = &aux->mt->columns[i];
1104         const struct ovsdb_column *column = c->column;
1105         unsigned int idx = c->column->index;
1106
1107         if (!(type & c->select)) {
1108             /* We don't care about this type of change for this particular
1109              * column (but we will care about it for some other column). */
1110             continue;
1111         }
1112
1113         if ((type == OJMS_MODIFY && bitmap_is_set(changed, idx))
1114             || type == OJMS_DELETE) {
1115             json_object_put(old_json, column->name,
1116                             ovsdb_datum_to_json(&old->fields[idx],
1117                                                 &column->type));
1118         }
1119         if (type & (OJMS_INITIAL | OJMS_INSERT | OJMS_MODIFY)) {
1120             json_object_put(new_json, column->name,
1121                             ovsdb_datum_to_json(&new->fields[idx],
1122                                                 &column->type));
1123         }
1124     }
1125
1126     /* Create JSON object for transaction overall. */
1127     if (!aux->json) {
1128         aux->json = json_object_create();
1129     }
1130
1131     /* Create JSON object for transaction on this table. */
1132     if (!aux->table_json) {
1133         aux->table_json = json_object_create();
1134         json_object_put(aux->json, aux->mt->table->schema->name,
1135                         aux->table_json);
1136     }
1137
1138     /* Create JSON object for transaction on this row. */
1139     row_json = json_object_create();
1140     if (old_json) {
1141         json_object_put(row_json, "old", old_json);
1142     }
1143     if (new_json) {
1144         json_object_put(row_json, "new", new_json);
1145     }
1146
1147     /* Add JSON row to JSON table. */
1148     snprintf(uuid, sizeof uuid,
1149              UUID_FMT, UUID_ARGS(ovsdb_row_get_uuid(new ? new : old)));
1150     json_object_put(aux->table_json, uuid, row_json);
1151
1152     return true;
1153 }
1154
1155 static void
1156 ovsdb_jsonrpc_monitor_init_aux(struct ovsdb_jsonrpc_monitor_aux *aux,
1157                                const struct ovsdb_jsonrpc_monitor *m,
1158                                bool initial)
1159 {
1160     aux->initial = initial;
1161     aux->monitor = m;
1162     aux->json = NULL;
1163     aux->mt = NULL;
1164     aux->table_json = NULL;
1165 }
1166
1167 static struct ovsdb_error *
1168 ovsdb_jsonrpc_monitor_commit(struct ovsdb_replica *replica,
1169                              const struct ovsdb_txn *txn,
1170                              bool durable OVS_UNUSED)
1171 {
1172     struct ovsdb_jsonrpc_monitor *m = ovsdb_jsonrpc_monitor_cast(replica);
1173     struct ovsdb_jsonrpc_monitor_aux aux;
1174
1175     ovsdb_jsonrpc_monitor_init_aux(&aux, m, false);
1176     ovsdb_txn_for_each_change(txn, ovsdb_jsonrpc_monitor_change_cb, &aux);
1177     if (aux.json) {
1178         struct jsonrpc_msg *msg;
1179         struct json *params;
1180
1181         params = json_array_create_2(json_clone(aux.monitor->monitor_id),
1182                                      aux.json);
1183         msg = jsonrpc_create_notify("update", params);
1184         jsonrpc_session_send(aux.monitor->session->js, msg);
1185     }
1186
1187     return NULL;
1188 }
1189
1190 static struct json *
1191 ovsdb_jsonrpc_monitor_get_initial(const struct ovsdb_jsonrpc_monitor *m)
1192 {
1193     struct ovsdb_jsonrpc_monitor_aux aux;
1194     struct shash_node *node;
1195
1196     ovsdb_jsonrpc_monitor_init_aux(&aux, m, true);
1197     SHASH_FOR_EACH (node, &m->tables) {
1198         struct ovsdb_jsonrpc_monitor_table *mt = node->data;
1199
1200         if (mt->select & OJMS_INITIAL) {
1201             struct ovsdb_row *row;
1202
1203             HMAP_FOR_EACH (row, hmap_node, &mt->table->rows) {
1204                 ovsdb_jsonrpc_monitor_change_cb(NULL, row, NULL, &aux);
1205             }
1206         }
1207     }
1208     return aux.json ? aux.json : json_object_create();
1209 }
1210
1211 static void
1212 ovsdb_jsonrpc_monitor_destroy(struct ovsdb_replica *replica)
1213 {
1214     struct ovsdb_jsonrpc_monitor *m = ovsdb_jsonrpc_monitor_cast(replica);
1215     struct shash_node *node;
1216
1217     json_destroy(m->monitor_id);
1218     SHASH_FOR_EACH (node, &m->tables) {
1219         struct ovsdb_jsonrpc_monitor_table *mt = node->data;
1220         free(mt->columns);
1221         free(mt);
1222     }
1223     shash_destroy(&m->tables);
1224     hmap_remove(&m->session->monitors, &m->node);
1225     free(m);
1226 }
1227
1228 static const struct ovsdb_replica_class ovsdb_jsonrpc_replica_class = {
1229     ovsdb_jsonrpc_monitor_commit,
1230     ovsdb_jsonrpc_monitor_destroy
1231 };