1 /* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include "ovsdb-idl.h"
27 #include "dynamic-string.h"
28 #include "fatal-signal.h"
31 #include "ovsdb-data.h"
32 #include "ovsdb-error.h"
33 #include "ovsdb-idl-provider.h"
34 #include "poll-loop.h"
39 VLOG_DEFINE_THIS_MODULE(ovsdb_idl);
41 /* An arc from one idl_row to another. When row A contains a UUID that
42 * references row B, this is represented by an arc from A (the source) to B
45 * Arcs from a row to itself are omitted, that is, src and dst are always
48 * Arcs are never duplicated, that is, even if there are multiple references
49 * from A to B, there is only a single arc from A to B.
51 * Arcs are directed: an arc from A to B is the converse of an an arc from B to
52 * A. Both an arc and its converse may both be present, if each row refers
53 * to the other circularly.
55 * The source and destination row may be in the same table or in different
58 struct ovsdb_idl_arc {
59 struct list src_node; /* In src->src_arcs list. */
60 struct list dst_node; /* In dst->dst_arcs list. */
61 struct ovsdb_idl_row *src; /* Source row. */
62 struct ovsdb_idl_row *dst; /* Destination row. */
66 const struct ovsdb_idl_class *class;
67 struct jsonrpc_session *session;
68 struct shash table_by_name;
69 struct ovsdb_idl_table *tables; /* Contains "struct ovsdb_idl_table *"s.*/
70 struct json *monitor_request_id;
71 unsigned int last_monitor_request_seqno;
72 unsigned int change_seqno;
74 /* Database locking. */
75 char *lock_name; /* Name of lock we need, NULL if none. */
76 bool has_lock; /* Has db server told us we have the lock? */
77 bool is_lock_contended; /* Has db server told us we can't get lock? */
78 struct json *lock_request_id; /* JSON-RPC ID of in-flight lock request. */
80 /* Transaction support. */
81 struct ovsdb_idl_txn *txn;
82 struct hmap outstanding_txns;
85 struct ovsdb_idl_txn {
86 struct hmap_node hmap_node;
87 struct json *request_id;
88 struct ovsdb_idl *idl;
90 enum ovsdb_idl_txn_status status;
94 unsigned int commit_seqno;
97 const char *inc_table;
98 const char *inc_column;
100 unsigned int inc_index;
101 int64_t inc_new_value;
104 struct hmap inserted_rows; /* Contains "struct ovsdb_idl_txn_insert"s. */
107 struct ovsdb_idl_txn_insert {
108 struct hmap_node hmap_node; /* In struct ovsdb_idl_txn's inserted_rows. */
109 struct uuid dummy; /* Dummy UUID used locally. */
110 int op_index; /* Index into transaction's operation array. */
111 struct uuid real; /* Real UUID used by database server. */
114 static struct vlog_rate_limit syntax_rl = VLOG_RATE_LIMIT_INIT(1, 5);
115 static struct vlog_rate_limit semantic_rl = VLOG_RATE_LIMIT_INIT(1, 5);
117 static void ovsdb_idl_clear(struct ovsdb_idl *);
118 static void ovsdb_idl_send_monitor_request(struct ovsdb_idl *);
119 static void ovsdb_idl_parse_update(struct ovsdb_idl *, const struct json *);
120 static struct ovsdb_error *ovsdb_idl_parse_update__(struct ovsdb_idl *,
121 const struct json *);
122 static bool ovsdb_idl_process_update(struct ovsdb_idl_table *,
124 const struct json *old,
125 const struct json *new);
126 static void ovsdb_idl_insert_row(struct ovsdb_idl_row *, const struct json *);
127 static void ovsdb_idl_delete_row(struct ovsdb_idl_row *);
128 static bool ovsdb_idl_modify_row(struct ovsdb_idl_row *, const struct json *);
130 static bool ovsdb_idl_row_is_orphan(const struct ovsdb_idl_row *);
131 static struct ovsdb_idl_row *ovsdb_idl_row_create__(
132 const struct ovsdb_idl_table_class *);
133 static struct ovsdb_idl_row *ovsdb_idl_row_create(struct ovsdb_idl_table *,
134 const struct uuid *);
135 static void ovsdb_idl_row_destroy(struct ovsdb_idl_row *);
137 static void ovsdb_idl_row_parse(struct ovsdb_idl_row *);
138 static void ovsdb_idl_row_unparse(struct ovsdb_idl_row *);
139 static void ovsdb_idl_row_clear_old(struct ovsdb_idl_row *);
140 static void ovsdb_idl_row_clear_new(struct ovsdb_idl_row *);
142 static void ovsdb_idl_txn_abort_all(struct ovsdb_idl *);
143 static bool ovsdb_idl_txn_process_reply(struct ovsdb_idl *,
144 const struct jsonrpc_msg *msg);
146 static void ovsdb_idl_send_lock_request(struct ovsdb_idl *);
147 static void ovsdb_idl_send_unlock_request(struct ovsdb_idl *);
148 static void ovsdb_idl_parse_lock_reply(struct ovsdb_idl *,
149 const struct json *);
150 static void ovsdb_idl_parse_lock_notify(struct ovsdb_idl *,
151 const struct json *params,
154 /* Creates and returns a connection to database 'remote', which should be in a
155 * form acceptable to jsonrpc_session_open(). The connection will maintain an
156 * in-memory replica of the remote database whose schema is described by
157 * 'class'. (Ordinarily 'class' is compiled from an OVSDB schema automatically
160 * If 'monitor_everything_by_default' is true, then everything in the remote
161 * database will be replicated by default. ovsdb_idl_omit() and
162 * ovsdb_idl_omit_alert() may be used to selectively drop some columns from
165 * If 'monitor_everything_by_default' is false, then no columns or tables will
166 * be replicated by default. ovsdb_idl_add_column() and ovsdb_idl_add_table()
167 * must be used to choose some columns or tables to replicate.
170 ovsdb_idl_create(const char *remote, const struct ovsdb_idl_class *class,
171 bool monitor_everything_by_default)
173 struct ovsdb_idl *idl;
174 uint8_t default_mode;
177 default_mode = (monitor_everything_by_default
178 ? OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT
181 idl = xzalloc(sizeof *idl);
183 idl->session = jsonrpc_session_open(remote);
184 shash_init(&idl->table_by_name);
185 idl->tables = xmalloc(class->n_tables * sizeof *idl->tables);
186 for (i = 0; i < class->n_tables; i++) {
187 const struct ovsdb_idl_table_class *tc = &class->tables[i];
188 struct ovsdb_idl_table *table = &idl->tables[i];
191 shash_add_assert(&idl->table_by_name, tc->name, table);
193 table->modes = xmalloc(tc->n_columns);
194 memset(table->modes, default_mode, tc->n_columns);
195 table->need_table = false;
196 shash_init(&table->columns);
197 for (j = 0; j < tc->n_columns; j++) {
198 const struct ovsdb_idl_column *column = &tc->columns[j];
200 shash_add_assert(&table->columns, column->name, column);
202 hmap_init(&table->rows);
205 idl->last_monitor_request_seqno = UINT_MAX;
206 hmap_init(&idl->outstanding_txns);
211 /* Destroys 'idl' and all of the data structures that it manages. */
213 ovsdb_idl_destroy(struct ovsdb_idl *idl)
219 ovsdb_idl_clear(idl);
220 jsonrpc_session_close(idl->session);
222 for (i = 0; i < idl->class->n_tables; i++) {
223 struct ovsdb_idl_table *table = &idl->tables[i];
224 shash_destroy(&table->columns);
225 hmap_destroy(&table->rows);
228 shash_destroy(&idl->table_by_name);
230 json_destroy(idl->monitor_request_id);
231 free(idl->lock_name);
232 json_destroy(idl->lock_request_id);
238 ovsdb_idl_clear(struct ovsdb_idl *idl)
240 bool changed = false;
243 for (i = 0; i < idl->class->n_tables; i++) {
244 struct ovsdb_idl_table *table = &idl->tables[i];
245 struct ovsdb_idl_row *row, *next_row;
247 if (hmap_is_empty(&table->rows)) {
252 HMAP_FOR_EACH_SAFE (row, next_row, hmap_node, &table->rows) {
253 struct ovsdb_idl_arc *arc, *next_arc;
255 if (!ovsdb_idl_row_is_orphan(row)) {
256 ovsdb_idl_row_unparse(row);
258 LIST_FOR_EACH_SAFE (arc, next_arc, src_node, &row->src_arcs) {
261 /* No need to do anything with dst_arcs: some node has those arcs
262 * as forward arcs and will destroy them itself. */
264 ovsdb_idl_row_destroy(row);
273 /* Processes a batch of messages from the database server on 'idl'. This may
274 * cause the IDL's contents to change. The client may check for that with
275 * ovsdb_idl_get_seqno(). */
277 ovsdb_idl_run(struct ovsdb_idl *idl)
282 jsonrpc_session_run(idl->session);
283 for (i = 0; jsonrpc_session_is_connected(idl->session) && i < 50; i++) {
284 struct jsonrpc_msg *msg;
287 seqno = jsonrpc_session_get_seqno(idl->session);
288 if (idl->last_monitor_request_seqno != seqno) {
289 idl->last_monitor_request_seqno = seqno;
290 ovsdb_idl_txn_abort_all(idl);
291 ovsdb_idl_send_monitor_request(idl);
292 if (idl->lock_name) {
293 ovsdb_idl_send_lock_request(idl);
298 msg = jsonrpc_session_recv(idl->session);
303 if (msg->type == JSONRPC_NOTIFY
304 && !strcmp(msg->method, "update")
305 && msg->params->type == JSON_ARRAY
306 && msg->params->u.array.n == 2
307 && msg->params->u.array.elems[0]->type == JSON_NULL) {
308 /* Database contents changed. */
309 ovsdb_idl_parse_update(idl, msg->params->u.array.elems[1]);
310 } else if (msg->type == JSONRPC_REPLY
311 && idl->monitor_request_id
312 && json_equal(idl->monitor_request_id, msg->id)) {
313 /* Reply to our "monitor" request. */
315 json_destroy(idl->monitor_request_id);
316 idl->monitor_request_id = NULL;
317 ovsdb_idl_clear(idl);
318 ovsdb_idl_parse_update(idl, msg->result);
319 } else if (msg->type == JSONRPC_REPLY
320 && idl->lock_request_id
321 && json_equal(idl->lock_request_id, msg->id)) {
322 /* Reply to our "lock" request. */
323 ovsdb_idl_parse_lock_reply(idl, msg->result);
324 } else if (msg->type == JSONRPC_NOTIFY
325 && !strcmp(msg->method, "locked")) {
326 /* We got our lock. */
327 ovsdb_idl_parse_lock_notify(idl, msg->params, true);
328 } else if (msg->type == JSONRPC_NOTIFY
329 && !strcmp(msg->method, "stolen")) {
330 /* Someone else stole our lock. */
331 ovsdb_idl_parse_lock_notify(idl, msg->params, false);
332 } else if (msg->type == JSONRPC_REPLY && msg->id->type == JSON_STRING
333 && !strcmp(msg->id->u.string, "echo")) {
334 /* Reply to our echo request. Ignore it. */
335 } else if ((msg->type == JSONRPC_ERROR
336 || msg->type == JSONRPC_REPLY)
337 && ovsdb_idl_txn_process_reply(idl, msg)) {
338 /* ovsdb_idl_txn_process_reply() did everything needful. */
340 /* This can happen if ovsdb_idl_txn_destroy() is called to destroy
341 * a transaction before we receive the reply, so keep the log level
343 VLOG_DBG("%s: received unexpected %s message",
344 jsonrpc_session_get_name(idl->session),
345 jsonrpc_msg_type_to_string(msg->type));
347 jsonrpc_msg_destroy(msg);
351 /* Arranges for poll_block() to wake up when ovsdb_idl_run() has something to
352 * do or when activity occurs on a transaction on 'idl'. */
354 ovsdb_idl_wait(struct ovsdb_idl *idl)
356 jsonrpc_session_wait(idl->session);
357 jsonrpc_session_recv_wait(idl->session);
360 /* Returns a "sequence number" that represents the state of 'idl'. When
361 * ovsdb_idl_run() changes the database, the sequence number changes. The
362 * initial fetch of the entire contents of the remote database is considered to
363 * be one kind of change. Successfully acquiring a lock, if one has been
364 * configured with ovsdb_idl_set_lock(), is also considered to be a change.
366 * As long as the sequence number does not change, the client may continue to
367 * use any data structures it obtains from 'idl'. But when it changes, the
368 * client must not access any of these data structures again, because they
369 * could have freed or reused for other purposes.
371 * The sequence number can occasionally change even if the database does not.
372 * This happens if the connection to the database drops and reconnects, which
373 * causes the database contents to be reloaded even if they didn't change. (It
374 * could also happen if the database server sends out a "change" that reflects
375 * what the IDL already thought was in the database. The database server is
376 * not supposed to do that, but bugs could in theory cause it to do so.) */
378 ovsdb_idl_get_seqno(const struct ovsdb_idl *idl)
380 return idl->change_seqno;
383 /* Returns true if 'idl' successfully connected to the remote database and
384 * retrieved its contents (even if the connection subsequently dropped and is
385 * in the process of reconnecting). If so, then 'idl' contains an atomic
386 * snapshot of the database's contents (but it might be arbitrarily old if the
387 * connection dropped).
389 * Returns false if 'idl' has never connected or retrieved the database's
390 * contents. If so, 'idl' is empty. */
392 ovsdb_idl_has_ever_connected(const struct ovsdb_idl *idl)
394 return ovsdb_idl_get_seqno(idl) != 0;
397 /* Forces 'idl' to drop its connection to the database and reconnect. In the
398 * meantime, the contents of 'idl' will not change. */
400 ovsdb_idl_force_reconnect(struct ovsdb_idl *idl)
402 jsonrpc_session_force_reconnect(idl->session);
405 static unsigned char *
406 ovsdb_idl_get_mode(struct ovsdb_idl *idl,
407 const struct ovsdb_idl_column *column)
411 assert(!idl->change_seqno);
413 for (i = 0; i < idl->class->n_tables; i++) {
414 const struct ovsdb_idl_table *table = &idl->tables[i];
415 const struct ovsdb_idl_table_class *tc = table->class;
417 if (column >= tc->columns && column < &tc->columns[tc->n_columns]) {
418 return &table->modes[column - tc->columns];
426 add_ref_table(struct ovsdb_idl *idl, const struct ovsdb_base_type *base)
428 if (base->type == OVSDB_TYPE_UUID && base->u.uuid.refTableName) {
429 struct ovsdb_idl_table *table;
431 table = shash_find_data(&idl->table_by_name,
432 base->u.uuid.refTableName);
434 table->need_table = true;
436 VLOG_WARN("%s IDL class missing referenced table %s",
437 idl->class->database, base->u.uuid.refTableName);
442 /* Turns on OVSDB_IDL_MONITOR and OVSDB_IDL_ALERT for 'column' in 'idl'. Also
443 * ensures that any tables referenced by 'column' will be replicated, even if
444 * no columns in that table are selected for replication (see
445 * ovsdb_idl_add_table() for more information).
447 * This function is only useful if 'monitor_everything_by_default' was false in
448 * the call to ovsdb_idl_create(). This function should be called between
449 * ovsdb_idl_create() and the first call to ovsdb_idl_run().
452 ovsdb_idl_add_column(struct ovsdb_idl *idl,
453 const struct ovsdb_idl_column *column)
455 *ovsdb_idl_get_mode(idl, column) = OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT;
456 add_ref_table(idl, &column->type.key);
457 add_ref_table(idl, &column->type.value);
460 /* Ensures that the table with class 'tc' will be replicated on 'idl' even if
461 * no columns are selected for replication. This can be useful because it
462 * allows 'idl' to keep track of what rows in the table actually exist, which
463 * in turn allows columns that reference the table to have accurate contents.
464 * (The IDL presents the database with references to rows that do not exist
467 * This function is only useful if 'monitor_everything_by_default' was false in
468 * the call to ovsdb_idl_create(). This function should be called between
469 * ovsdb_idl_create() and the first call to ovsdb_idl_run().
472 ovsdb_idl_add_table(struct ovsdb_idl *idl,
473 const struct ovsdb_idl_table_class *tc)
477 for (i = 0; i < idl->class->n_tables; i++) {
478 struct ovsdb_idl_table *table = &idl->tables[i];
480 if (table->class == tc) {
481 table->need_table = true;
489 /* Turns off OVSDB_IDL_ALERT for 'column' in 'idl'.
491 * This function should be called between ovsdb_idl_create() and the first call
492 * to ovsdb_idl_run().
495 ovsdb_idl_omit_alert(struct ovsdb_idl *idl,
496 const struct ovsdb_idl_column *column)
498 *ovsdb_idl_get_mode(idl, column) &= ~OVSDB_IDL_ALERT;
501 /* Sets the mode for 'column' in 'idl' to 0. See the big comment above
502 * OVSDB_IDL_MONITOR for details.
504 * This function should be called between ovsdb_idl_create() and the first call
505 * to ovsdb_idl_run().
508 ovsdb_idl_omit(struct ovsdb_idl *idl, const struct ovsdb_idl_column *column)
510 *ovsdb_idl_get_mode(idl, column) = 0;
514 ovsdb_idl_send_monitor_request(struct ovsdb_idl *idl)
516 struct json *monitor_requests;
517 struct jsonrpc_msg *msg;
520 monitor_requests = json_object_create();
521 for (i = 0; i < idl->class->n_tables; i++) {
522 const struct ovsdb_idl_table *table = &idl->tables[i];
523 const struct ovsdb_idl_table_class *tc = table->class;
524 struct json *monitor_request, *columns;
527 columns = table->need_table ? json_array_create_empty() : NULL;
528 for (j = 0; j < tc->n_columns; j++) {
529 const struct ovsdb_idl_column *column = &tc->columns[j];
530 if (table->modes[j] & OVSDB_IDL_MONITOR) {
532 columns = json_array_create_empty();
534 json_array_add(columns, json_string_create(column->name));
539 monitor_request = json_object_create();
540 json_object_put(monitor_request, "columns", columns);
541 json_object_put(monitor_requests, tc->name, monitor_request);
545 json_destroy(idl->monitor_request_id);
546 msg = jsonrpc_create_request(
548 json_array_create_3(json_string_create(idl->class->database),
549 json_null_create(), monitor_requests),
550 &idl->monitor_request_id);
551 jsonrpc_session_send(idl->session, msg);
555 ovsdb_idl_parse_update(struct ovsdb_idl *idl, const struct json *table_updates)
557 struct ovsdb_error *error = ovsdb_idl_parse_update__(idl, table_updates);
559 if (!VLOG_DROP_WARN(&syntax_rl)) {
560 char *s = ovsdb_error_to_string(error);
561 VLOG_WARN_RL(&syntax_rl, "%s", s);
564 ovsdb_error_destroy(error);
568 static struct ovsdb_error *
569 ovsdb_idl_parse_update__(struct ovsdb_idl *idl,
570 const struct json *table_updates)
572 const struct shash_node *tables_node;
574 if (table_updates->type != JSON_OBJECT) {
575 return ovsdb_syntax_error(table_updates, NULL,
576 "<table-updates> is not an object");
578 SHASH_FOR_EACH (tables_node, json_object(table_updates)) {
579 const struct json *table_update = tables_node->data;
580 const struct shash_node *table_node;
581 struct ovsdb_idl_table *table;
583 table = shash_find_data(&idl->table_by_name, tables_node->name);
585 return ovsdb_syntax_error(
587 "<table-updates> includes unknown table \"%s\"",
591 if (table_update->type != JSON_OBJECT) {
592 return ovsdb_syntax_error(table_update, NULL,
593 "<table-update> for table \"%s\" is "
594 "not an object", table->class->name);
596 SHASH_FOR_EACH (table_node, json_object(table_update)) {
597 const struct json *row_update = table_node->data;
598 const struct json *old_json, *new_json;
601 if (!uuid_from_string(&uuid, table_node->name)) {
602 return ovsdb_syntax_error(table_update, NULL,
603 "<table-update> for table \"%s\" "
605 "\"%s\" as member name",
609 if (row_update->type != JSON_OBJECT) {
610 return ovsdb_syntax_error(row_update, NULL,
611 "<table-update> for table \"%s\" "
612 "contains <row-update> for %s that "
618 old_json = shash_find_data(json_object(row_update), "old");
619 new_json = shash_find_data(json_object(row_update), "new");
620 if (old_json && old_json->type != JSON_OBJECT) {
621 return ovsdb_syntax_error(old_json, NULL,
622 "\"old\" <row> is not object");
623 } else if (new_json && new_json->type != JSON_OBJECT) {
624 return ovsdb_syntax_error(new_json, NULL,
625 "\"new\" <row> is not object");
626 } else if ((old_json != NULL) + (new_json != NULL)
627 != shash_count(json_object(row_update))) {
628 return ovsdb_syntax_error(row_update, NULL,
629 "<row-update> contains unexpected "
631 } else if (!old_json && !new_json) {
632 return ovsdb_syntax_error(row_update, NULL,
633 "<row-update> missing \"old\" "
634 "and \"new\" members");
637 if (ovsdb_idl_process_update(table, &uuid, old_json, new_json)) {
646 static struct ovsdb_idl_row *
647 ovsdb_idl_get_row(struct ovsdb_idl_table *table, const struct uuid *uuid)
649 struct ovsdb_idl_row *row;
651 HMAP_FOR_EACH_WITH_HASH (row, hmap_node, uuid_hash(uuid), &table->rows) {
652 if (uuid_equals(&row->uuid, uuid)) {
659 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
662 ovsdb_idl_process_update(struct ovsdb_idl_table *table,
663 const struct uuid *uuid, const struct json *old,
664 const struct json *new)
666 struct ovsdb_idl_row *row;
668 row = ovsdb_idl_get_row(table, uuid);
671 if (row && !ovsdb_idl_row_is_orphan(row)) {
672 /* XXX perhaps we should check the 'old' values? */
673 ovsdb_idl_delete_row(row);
675 VLOG_WARN_RL(&semantic_rl, "cannot delete missing row "UUID_FMT" "
677 UUID_ARGS(uuid), table->class->name);
683 ovsdb_idl_insert_row(ovsdb_idl_row_create(table, uuid), new);
684 } else if (ovsdb_idl_row_is_orphan(row)) {
685 ovsdb_idl_insert_row(row, new);
687 VLOG_WARN_RL(&semantic_rl, "cannot add existing row "UUID_FMT" to "
688 "table %s", UUID_ARGS(uuid), table->class->name);
689 return ovsdb_idl_modify_row(row, new);
694 /* XXX perhaps we should check the 'old' values? */
695 if (!ovsdb_idl_row_is_orphan(row)) {
696 return ovsdb_idl_modify_row(row, new);
698 VLOG_WARN_RL(&semantic_rl, "cannot modify missing but "
699 "referenced row "UUID_FMT" in table %s",
700 UUID_ARGS(uuid), table->class->name);
701 ovsdb_idl_insert_row(row, new);
704 VLOG_WARN_RL(&semantic_rl, "cannot modify missing row "UUID_FMT" "
705 "in table %s", UUID_ARGS(uuid), table->class->name);
706 ovsdb_idl_insert_row(ovsdb_idl_row_create(table, uuid), new);
713 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
716 ovsdb_idl_row_update(struct ovsdb_idl_row *row, const struct json *row_json)
718 struct ovsdb_idl_table *table = row->table;
719 struct shash_node *node;
720 bool changed = false;
722 SHASH_FOR_EACH (node, json_object(row_json)) {
723 const char *column_name = node->name;
724 const struct ovsdb_idl_column *column;
725 struct ovsdb_datum datum;
726 struct ovsdb_error *error;
728 column = shash_find_data(&table->columns, column_name);
730 VLOG_WARN_RL(&syntax_rl, "unknown column %s updating row "UUID_FMT,
731 column_name, UUID_ARGS(&row->uuid));
735 error = ovsdb_datum_from_json(&datum, &column->type, node->data, NULL);
737 unsigned int column_idx = column - table->class->columns;
738 struct ovsdb_datum *old = &row->old[column_idx];
740 if (!ovsdb_datum_equals(old, &datum, &column->type)) {
741 ovsdb_datum_swap(old, &datum);
742 if (table->modes[column_idx] & OVSDB_IDL_ALERT) {
746 /* Didn't really change but the OVSDB monitor protocol always
747 * includes every value in a row. */
750 ovsdb_datum_destroy(&datum, &column->type);
752 char *s = ovsdb_error_to_string(error);
753 VLOG_WARN_RL(&syntax_rl, "error parsing column %s in row "UUID_FMT
754 " in table %s: %s", column_name,
755 UUID_ARGS(&row->uuid), table->class->name, s);
757 ovsdb_error_destroy(error);
763 /* When a row A refers to row B through a column with a "refTable" constraint,
764 * but row B does not exist, row B is called an "orphan row". Orphan rows
765 * should not persist, because the database enforces referential integrity, but
766 * they can appear transiently as changes from the database are received (the
767 * database doesn't try to topologically sort them and circular references mean
768 * it isn't always possible anyhow).
770 * This function returns true if 'row' is an orphan row, otherwise false.
773 ovsdb_idl_row_is_orphan(const struct ovsdb_idl_row *row)
775 return !row->old && !row->new;
778 /* Returns true if 'row' is conceptually part of the database as modified by
779 * the current transaction (if any), false otherwise.
781 * This function will return true if 'row' is not an orphan (see the comment on
782 * ovsdb_idl_row_is_orphan()) and:
784 * - 'row' exists in the database and has not been deleted within the
785 * current transaction (if any).
787 * - 'row' was inserted within the current transaction and has not been
788 * deleted. (In the latter case you should not have passed 'row' in at
789 * all, because ovsdb_idl_txn_delete() freed it.)
791 * This function will return false if 'row' is an orphan or if 'row' was
792 * deleted within the current transaction.
795 ovsdb_idl_row_exists(const struct ovsdb_idl_row *row)
797 return row->new != NULL;
801 ovsdb_idl_row_parse(struct ovsdb_idl_row *row)
803 const struct ovsdb_idl_table_class *class = row->table->class;
806 for (i = 0; i < class->n_columns; i++) {
807 const struct ovsdb_idl_column *c = &class->columns[i];
808 (c->parse)(row, &row->old[i]);
813 ovsdb_idl_row_unparse(struct ovsdb_idl_row *row)
815 const struct ovsdb_idl_table_class *class = row->table->class;
818 for (i = 0; i < class->n_columns; i++) {
819 const struct ovsdb_idl_column *c = &class->columns[i];
825 ovsdb_idl_row_clear_old(struct ovsdb_idl_row *row)
827 assert(row->old == row->new);
828 if (!ovsdb_idl_row_is_orphan(row)) {
829 const struct ovsdb_idl_table_class *class = row->table->class;
832 for (i = 0; i < class->n_columns; i++) {
833 ovsdb_datum_destroy(&row->old[i], &class->columns[i].type);
836 row->old = row->new = NULL;
841 ovsdb_idl_row_clear_new(struct ovsdb_idl_row *row)
843 if (row->old != row->new) {
845 const struct ovsdb_idl_table_class *class = row->table->class;
849 BITMAP_FOR_EACH_1 (i, class->n_columns, row->written) {
850 ovsdb_datum_destroy(&row->new[i], &class->columns[i].type);
862 ovsdb_idl_row_clear_arcs(struct ovsdb_idl_row *row, bool destroy_dsts)
864 struct ovsdb_idl_arc *arc, *next;
866 /* Delete all forward arcs. If 'destroy_dsts', destroy any orphaned rows
867 * that this causes to be unreferenced. */
868 LIST_FOR_EACH_SAFE (arc, next, src_node, &row->src_arcs) {
869 list_remove(&arc->dst_node);
871 && ovsdb_idl_row_is_orphan(arc->dst)
872 && list_is_empty(&arc->dst->dst_arcs)) {
873 ovsdb_idl_row_destroy(arc->dst);
877 list_init(&row->src_arcs);
880 /* Force nodes that reference 'row' to reparse. */
882 ovsdb_idl_row_reparse_backrefs(struct ovsdb_idl_row *row)
884 struct ovsdb_idl_arc *arc, *next;
886 /* This is trickier than it looks. ovsdb_idl_row_clear_arcs() will destroy
887 * 'arc', so we need to use the "safe" variant of list traversal. However,
888 * calling an ovsdb_idl_column's 'parse' function will add an arc
889 * equivalent to 'arc' to row->arcs. That could be a problem for
890 * traversal, but it adds it at the beginning of the list to prevent us
891 * from stumbling upon it again.
893 * (If duplicate arcs were possible then we would need to make sure that
894 * 'next' didn't also point into 'arc''s destination, but we forbid
895 * duplicate arcs.) */
896 LIST_FOR_EACH_SAFE (arc, next, dst_node, &row->dst_arcs) {
897 struct ovsdb_idl_row *ref = arc->src;
899 ovsdb_idl_row_unparse(ref);
900 ovsdb_idl_row_clear_arcs(ref, false);
901 ovsdb_idl_row_parse(ref);
905 static struct ovsdb_idl_row *
906 ovsdb_idl_row_create__(const struct ovsdb_idl_table_class *class)
908 struct ovsdb_idl_row *row = xzalloc(class->allocation_size);
909 class->row_init(row);
910 list_init(&row->src_arcs);
911 list_init(&row->dst_arcs);
912 hmap_node_nullify(&row->txn_node);
916 static struct ovsdb_idl_row *
917 ovsdb_idl_row_create(struct ovsdb_idl_table *table, const struct uuid *uuid)
919 struct ovsdb_idl_row *row = ovsdb_idl_row_create__(table->class);
920 hmap_insert(&table->rows, &row->hmap_node, uuid_hash(uuid));
927 ovsdb_idl_row_destroy(struct ovsdb_idl_row *row)
930 ovsdb_idl_row_clear_old(row);
931 hmap_remove(&row->table->rows, &row->hmap_node);
937 ovsdb_idl_insert_row(struct ovsdb_idl_row *row, const struct json *row_json)
939 const struct ovsdb_idl_table_class *class = row->table->class;
942 assert(!row->old && !row->new);
943 row->old = row->new = xmalloc(class->n_columns * sizeof *row->old);
944 for (i = 0; i < class->n_columns; i++) {
945 ovsdb_datum_init_default(&row->old[i], &class->columns[i].type);
947 ovsdb_idl_row_update(row, row_json);
948 ovsdb_idl_row_parse(row);
950 ovsdb_idl_row_reparse_backrefs(row);
954 ovsdb_idl_delete_row(struct ovsdb_idl_row *row)
956 ovsdb_idl_row_unparse(row);
957 ovsdb_idl_row_clear_arcs(row, true);
958 ovsdb_idl_row_clear_old(row);
959 if (list_is_empty(&row->dst_arcs)) {
960 ovsdb_idl_row_destroy(row);
962 ovsdb_idl_row_reparse_backrefs(row);
966 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
969 ovsdb_idl_modify_row(struct ovsdb_idl_row *row, const struct json *row_json)
973 ovsdb_idl_row_unparse(row);
974 ovsdb_idl_row_clear_arcs(row, true);
975 changed = ovsdb_idl_row_update(row, row_json);
976 ovsdb_idl_row_parse(row);
982 may_add_arc(const struct ovsdb_idl_row *src, const struct ovsdb_idl_row *dst)
984 const struct ovsdb_idl_arc *arc;
991 /* No duplicate arcs.
993 * We only need to test whether the first arc in dst->dst_arcs originates
994 * at 'src', since we add all of the arcs from a given source in a clump
995 * (in a single call to ovsdb_idl_row_parse()) and new arcs are always
996 * added at the front of the dst_arcs list. */
997 if (list_is_empty(&dst->dst_arcs)) {
1000 arc = CONTAINER_OF(dst->dst_arcs.next, struct ovsdb_idl_arc, dst_node);
1001 return arc->src != src;
1004 static struct ovsdb_idl_table *
1005 ovsdb_idl_table_from_class(const struct ovsdb_idl *idl,
1006 const struct ovsdb_idl_table_class *table_class)
1008 return &idl->tables[table_class - idl->class->tables];
1011 /* Called by ovsdb-idlc generated code. */
1012 struct ovsdb_idl_row *
1013 ovsdb_idl_get_row_arc(struct ovsdb_idl_row *src,
1014 struct ovsdb_idl_table_class *dst_table_class,
1015 const struct uuid *dst_uuid)
1017 struct ovsdb_idl *idl = src->table->idl;
1018 struct ovsdb_idl_table *dst_table;
1019 struct ovsdb_idl_arc *arc;
1020 struct ovsdb_idl_row *dst;
1022 dst_table = ovsdb_idl_table_from_class(idl, dst_table_class);
1023 dst = ovsdb_idl_get_row(dst_table, dst_uuid);
1025 /* We're being called from ovsdb_idl_txn_write(). We must not update
1026 * any arcs, because the transaction will be backed out at commit or
1027 * abort time and we don't want our graph screwed up.
1029 * Just return the destination row, if there is one and it has not been
1031 if (dst && (hmap_node_is_null(&dst->txn_node) || dst->new)) {
1036 /* We're being called from some other context. Update the graph. */
1038 dst = ovsdb_idl_row_create(dst_table, dst_uuid);
1041 /* Add a new arc, if it wouldn't be a self-arc or a duplicate arc. */
1042 if (may_add_arc(src, dst)) {
1043 /* The arc *must* be added at the front of the dst_arcs list. See
1044 * ovsdb_idl_row_reparse_backrefs() for details. */
1045 arc = xmalloc(sizeof *arc);
1046 list_push_front(&src->src_arcs, &arc->src_node);
1047 list_push_front(&dst->dst_arcs, &arc->dst_node);
1052 return !ovsdb_idl_row_is_orphan(dst) ? dst : NULL;
1056 /* Searches 'tc''s table in 'idl' for a row with UUID 'uuid'. Returns a
1057 * pointer to the row if there is one, otherwise a null pointer. */
1058 const struct ovsdb_idl_row *
1059 ovsdb_idl_get_row_for_uuid(const struct ovsdb_idl *idl,
1060 const struct ovsdb_idl_table_class *tc,
1061 const struct uuid *uuid)
1063 return ovsdb_idl_get_row(ovsdb_idl_table_from_class(idl, tc), uuid);
1066 static struct ovsdb_idl_row *
1067 next_real_row(struct ovsdb_idl_table *table, struct hmap_node *node)
1069 for (; node; node = hmap_next(&table->rows, node)) {
1070 struct ovsdb_idl_row *row;
1072 row = CONTAINER_OF(node, struct ovsdb_idl_row, hmap_node);
1073 if (ovsdb_idl_row_exists(row)) {
1080 /* Returns a row in 'table_class''s table in 'idl', or a null pointer if that
1083 * Database tables are internally maintained as hash tables, so adding or
1084 * removing rows while traversing the same table can cause some rows to be
1085 * visited twice or not at apply. */
1086 const struct ovsdb_idl_row *
1087 ovsdb_idl_first_row(const struct ovsdb_idl *idl,
1088 const struct ovsdb_idl_table_class *table_class)
1090 struct ovsdb_idl_table *table
1091 = ovsdb_idl_table_from_class(idl, table_class);
1092 return next_real_row(table, hmap_first(&table->rows));
1095 /* Returns a row following 'row' within its table, or a null pointer if 'row'
1096 * is the last row in its table. */
1097 const struct ovsdb_idl_row *
1098 ovsdb_idl_next_row(const struct ovsdb_idl_row *row)
1100 struct ovsdb_idl_table *table = row->table;
1102 return next_real_row(table, hmap_next(&table->rows, &row->hmap_node));
1105 /* Reads and returns the value of 'column' within 'row'. If an ongoing
1106 * transaction has changed 'column''s value, the modified value is returned.
1108 * The caller must not modify or free the returned value.
1110 * Various kinds of changes can invalidate the returned value: writing to the
1111 * same 'column' in 'row' (e.g. with ovsdb_idl_txn_write()), deleting 'row'
1112 * (e.g. with ovsdb_idl_txn_delete()), or completing an ongoing transaction
1113 * (e.g. with ovsdb_idl_txn_commit() or ovsdb_idl_txn_abort()). If the
1114 * returned value is needed for a long time, it is best to make a copy of it
1115 * with ovsdb_datum_clone(). */
1116 const struct ovsdb_datum *
1117 ovsdb_idl_read(const struct ovsdb_idl_row *row,
1118 const struct ovsdb_idl_column *column)
1120 const struct ovsdb_idl_table_class *class;
1123 assert(!ovsdb_idl_row_is_synthetic(row));
1125 class = row->table->class;
1126 column_idx = column - class->columns;
1128 assert(row->new != NULL);
1129 assert(column_idx < class->n_columns);
1131 if (row->written && bitmap_is_set(row->written, column_idx)) {
1132 return &row->new[column_idx];
1133 } else if (row->old) {
1134 return &row->old[column_idx];
1136 return ovsdb_datum_default(&column->type);
1140 /* Same as ovsdb_idl_read(), except that it also asserts that 'column' has key
1141 * type 'key_type' and value type 'value_type'. (Scalar and set types will
1142 * have a value type of OVSDB_TYPE_VOID.)
1144 * This is useful in code that "knows" that a particular column has a given
1145 * type, so that it will abort if someone changes the column's type without
1146 * updating the code that uses it. */
1147 const struct ovsdb_datum *
1148 ovsdb_idl_get(const struct ovsdb_idl_row *row,
1149 const struct ovsdb_idl_column *column,
1150 enum ovsdb_atomic_type key_type OVS_UNUSED,
1151 enum ovsdb_atomic_type value_type OVS_UNUSED)
1153 assert(column->type.key.type == key_type);
1154 assert(column->type.value.type == value_type);
1156 return ovsdb_idl_read(row, column);
1159 /* Returns false if 'row' was obtained from the IDL, true if it was initialized
1160 * to all-zero-bits by some other entity. If 'row' was set up some other way
1161 * then the return value is indeterminate. */
1163 ovsdb_idl_row_is_synthetic(const struct ovsdb_idl_row *row)
1165 return row->table == NULL;
1170 static void ovsdb_idl_txn_complete(struct ovsdb_idl_txn *txn,
1171 enum ovsdb_idl_txn_status);
1173 /* Returns a string representation of 'status'. The caller must not modify or
1174 * free the returned string.
1176 * The return value is probably useful only for debug log messages and unit
1179 ovsdb_idl_txn_status_to_string(enum ovsdb_idl_txn_status status)
1182 case TXN_UNCOMMITTED:
1183 return "uncommitted";
1186 case TXN_INCOMPLETE:
1187 return "incomplete";
1194 case TXN_NOT_LOCKED:
1195 return "not locked";
1202 /* Starts a new transaction on 'idl'. A given ovsdb_idl may only have a single
1203 * active transaction at a time. See the large comment in ovsdb-idl.h for
1204 * general information on transactions. */
1205 struct ovsdb_idl_txn *
1206 ovsdb_idl_txn_create(struct ovsdb_idl *idl)
1208 struct ovsdb_idl_txn *txn;
1211 idl->txn = txn = xmalloc(sizeof *txn);
1212 txn->request_id = NULL;
1214 hmap_init(&txn->txn_rows);
1215 txn->status = TXN_UNCOMMITTED;
1217 txn->dry_run = false;
1218 ds_init(&txn->comment);
1219 txn->commit_seqno = txn->idl->change_seqno;
1221 txn->inc_table = NULL;
1222 txn->inc_column = NULL;
1224 hmap_init(&txn->inserted_rows);
1229 /* Appends 's', which is treated as a printf()-type format string, to the
1230 * comments that will be passed to the OVSDB server when 'txn' is committed.
1231 * (The comment will be committed to the OVSDB log, which "ovsdb-tool
1232 * show-log" can print in a relatively human-readable form.) */
1234 ovsdb_idl_txn_add_comment(struct ovsdb_idl_txn *txn, const char *s, ...)
1238 if (txn->comment.length) {
1239 ds_put_char(&txn->comment, '\n');
1243 ds_put_format_valist(&txn->comment, s, args);
1247 /* Marks 'txn' as a transaction that will not actually modify the database. In
1248 * almost every way, the transaction is treated like other transactions. It
1249 * must be committed or aborted like other transactions, it will be sent to the
1250 * database server like other transactions, and so on. The only difference is
1251 * that the operations sent to the database server will include, as the last
1252 * step, an "abort" operation, so that any changes made by the transaction will
1253 * not actually take effect. */
1255 ovsdb_idl_txn_set_dry_run(struct ovsdb_idl_txn *txn)
1257 txn->dry_run = true;
1260 /* Causes 'txn', when committed, to increment the value of 'column' within
1261 * 'row' by 1. 'column' must have an integer type. After 'txn' commits
1262 * successfully, the client may retrieve the final (incremented) value of
1263 * 'column' with ovsdb_idl_txn_get_increment_new_value().
1265 * The client could accomplish something similar with ovsdb_idl_read(),
1266 * ovsdb_idl_txn_verify() and ovsdb_idl_txn_write(), or with ovsdb-idlc
1267 * generated wrappers for these functions. However, ovsdb_idl_txn_increment()
1268 * will never (by itself) fail because of a verify error.
1270 * The intended use is for incrementing the "next_cfg" column in the
1271 * Open_vSwitch table. */
1273 ovsdb_idl_txn_increment(struct ovsdb_idl_txn *txn,
1274 const struct ovsdb_idl_row *row,
1275 const struct ovsdb_idl_column *column)
1277 assert(!txn->inc_table);
1278 assert(column->type.key.type == OVSDB_TYPE_INTEGER);
1279 assert(column->type.value.type == OVSDB_TYPE_VOID);
1281 txn->inc_table = row->table->class->name;
1282 txn->inc_column = column->name;
1283 txn->inc_row = row->uuid;
1286 /* Destroys 'txn' and frees all associated memory. If ovsdb_idl_txn_commit()
1287 * has been called for 'txn' but the commit is still incomplete (that is, the
1288 * last call returned TXN_INCOMPLETE) then the transaction may or may not still
1289 * end up committing at the database server, but the client will not be able to
1290 * get any further status information back. */
1292 ovsdb_idl_txn_destroy(struct ovsdb_idl_txn *txn)
1294 struct ovsdb_idl_txn_insert *insert, *next;
1296 json_destroy(txn->request_id);
1297 if (txn->status == TXN_INCOMPLETE) {
1298 hmap_remove(&txn->idl->outstanding_txns, &txn->hmap_node);
1300 ovsdb_idl_txn_abort(txn);
1301 ds_destroy(&txn->comment);
1303 HMAP_FOR_EACH_SAFE (insert, next, hmap_node, &txn->inserted_rows) {
1306 hmap_destroy(&txn->inserted_rows);
1310 /* Causes poll_block() to wake up if 'txn' has completed committing. */
1312 ovsdb_idl_txn_wait(const struct ovsdb_idl_txn *txn)
1314 if (txn->status != TXN_UNCOMMITTED && txn->status != TXN_INCOMPLETE) {
1315 poll_immediate_wake();
1319 static struct json *
1320 where_uuid_equals(const struct uuid *uuid)
1323 json_array_create_1(
1324 json_array_create_3(
1325 json_string_create("_uuid"),
1326 json_string_create("=="),
1327 json_array_create_2(
1328 json_string_create("uuid"),
1329 json_string_create_nocopy(
1330 xasprintf(UUID_FMT, UUID_ARGS(uuid))))));
1334 uuid_name_from_uuid(const struct uuid *uuid)
1339 name = xasprintf("row"UUID_FMT, UUID_ARGS(uuid));
1340 for (p = name; *p != '\0'; p++) {
1349 static const struct ovsdb_idl_row *
1350 ovsdb_idl_txn_get_row(const struct ovsdb_idl_txn *txn, const struct uuid *uuid)
1352 const struct ovsdb_idl_row *row;
1354 HMAP_FOR_EACH_WITH_HASH (row, txn_node, uuid_hash(uuid), &txn->txn_rows) {
1355 if (uuid_equals(&row->uuid, uuid)) {
1362 /* XXX there must be a cleaner way to do this */
1363 static struct json *
1364 substitute_uuids(struct json *json, const struct ovsdb_idl_txn *txn)
1366 if (json->type == JSON_ARRAY) {
1370 if (json->u.array.n == 2
1371 && json->u.array.elems[0]->type == JSON_STRING
1372 && json->u.array.elems[1]->type == JSON_STRING
1373 && !strcmp(json->u.array.elems[0]->u.string, "uuid")
1374 && uuid_from_string(&uuid, json->u.array.elems[1]->u.string)) {
1375 const struct ovsdb_idl_row *row;
1377 row = ovsdb_idl_txn_get_row(txn, &uuid);
1378 if (row && !row->old && row->new) {
1381 return json_array_create_2(
1382 json_string_create("named-uuid"),
1383 json_string_create_nocopy(uuid_name_from_uuid(&uuid)));
1387 for (i = 0; i < json->u.array.n; i++) {
1388 json->u.array.elems[i] = substitute_uuids(json->u.array.elems[i],
1391 } else if (json->type == JSON_OBJECT) {
1392 struct shash_node *node;
1394 SHASH_FOR_EACH (node, json_object(json)) {
1395 node->data = substitute_uuids(node->data, txn);
1402 ovsdb_idl_txn_disassemble(struct ovsdb_idl_txn *txn)
1404 struct ovsdb_idl_row *row, *next;
1406 /* This must happen early. Otherwise, ovsdb_idl_row_parse() will call an
1407 * ovsdb_idl_column's 'parse' function, which will call
1408 * ovsdb_idl_get_row_arc(), which will seen that the IDL is in a
1409 * transaction and fail to update the graph. */
1410 txn->idl->txn = NULL;
1412 HMAP_FOR_EACH_SAFE (row, next, txn_node, &txn->txn_rows) {
1415 ovsdb_idl_row_unparse(row);
1416 ovsdb_idl_row_clear_arcs(row, false);
1417 ovsdb_idl_row_parse(row);
1420 ovsdb_idl_row_unparse(row);
1422 ovsdb_idl_row_clear_new(row);
1425 row->prereqs = NULL;
1428 row->written = NULL;
1430 hmap_remove(&txn->txn_rows, &row->txn_node);
1431 hmap_node_nullify(&row->txn_node);
1433 hmap_remove(&row->table->rows, &row->hmap_node);
1437 hmap_destroy(&txn->txn_rows);
1438 hmap_init(&txn->txn_rows);
1441 /* Attempts to commit 'txn'. Returns the status of the commit operation, one
1442 * of the following TXN_* constants:
1446 * The transaction is in progress, but not yet complete. The caller
1447 * should call again later, after calling ovsdb_idl_run() to let the IDL
1448 * do OVSDB protocol processing.
1452 * The transaction is complete. (It didn't actually change the database,
1453 * so the IDL didn't send any request to the database server.)
1457 * The caller previously called ovsdb_idl_txn_abort().
1461 * The transaction was successful. The update made by the transaction
1462 * (and possibly other changes made by other database clients) should
1463 * already be visible in the IDL.
1467 * The transaction failed for some transient reason, e.g. because a
1468 * "verify" operation reported an inconsistency or due to a network
1469 * problem. The caller should wait for a change to the database, then
1470 * compose a new transaction, and commit the new transaction.
1472 * Use the return value of ovsdb_idl_get_seqno() to wait for a change in
1473 * the database. It is important to use its return value *before* the
1474 * initial call to ovsdb_idl_txn_commit() as the baseline for this
1475 * purpose, because the change that one should wait for can happen after
1476 * the initial call but before the call that returns TXN_TRY_AGAIN, and
1477 * using some other baseline value in that situation could cause an
1478 * indefinite wait if the database rarely changes.
1482 * The transaction failed because the IDL has been configured to require
1483 * a database lock (with ovsdb_idl_set_lock()) but didn't get it yet or
1484 * has already lost it.
1486 * Committing a transaction rolls back all of the changes that it made to the
1487 * IDL's copy of the database. If the transaction commits successfully, then
1488 * the database server will send an update and, thus, the IDL will be updated
1489 * with the committed changes. */
1490 enum ovsdb_idl_txn_status
1491 ovsdb_idl_txn_commit(struct ovsdb_idl_txn *txn)
1493 struct ovsdb_idl_row *row;
1494 struct json *operations;
1497 if (txn != txn->idl->txn) {
1501 /* If we need a lock but don't have it, give up quickly. */
1502 if (txn->idl->lock_name && !ovsdb_idl_has_lock(txn->idl)) {
1503 txn->status = TXN_NOT_LOCKED;
1504 ovsdb_idl_txn_disassemble(txn);
1508 operations = json_array_create_1(
1509 json_string_create(txn->idl->class->database));
1511 /* Assert that we have the required lock (avoiding a race). */
1512 if (txn->idl->lock_name) {
1513 struct json *op = json_object_create();
1514 json_array_add(operations, op);
1515 json_object_put_string(op, "op", "assert");
1516 json_object_put_string(op, "lock", txn->idl->lock_name);
1519 /* Add prerequisites and declarations of new rows. */
1520 HMAP_FOR_EACH (row, txn_node, &txn->txn_rows) {
1521 /* XXX check that deleted rows exist even if no prereqs? */
1523 const struct ovsdb_idl_table_class *class = row->table->class;
1524 size_t n_columns = class->n_columns;
1525 struct json *op, *columns, *row_json;
1528 op = json_object_create();
1529 json_array_add(operations, op);
1530 json_object_put_string(op, "op", "wait");
1531 json_object_put_string(op, "table", class->name);
1532 json_object_put(op, "timeout", json_integer_create(0));
1533 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1534 json_object_put_string(op, "until", "==");
1535 columns = json_array_create_empty();
1536 json_object_put(op, "columns", columns);
1537 row_json = json_object_create();
1538 json_object_put(op, "rows", json_array_create_1(row_json));
1540 BITMAP_FOR_EACH_1 (idx, n_columns, row->prereqs) {
1541 const struct ovsdb_idl_column *column = &class->columns[idx];
1542 json_array_add(columns, json_string_create(column->name));
1543 json_object_put(row_json, column->name,
1544 ovsdb_datum_to_json(&row->old[idx],
1551 any_updates = false;
1552 HMAP_FOR_EACH (row, txn_node, &txn->txn_rows) {
1553 const struct ovsdb_idl_table_class *class = row->table->class;
1556 if (class->is_root) {
1557 struct json *op = json_object_create();
1558 json_object_put_string(op, "op", "delete");
1559 json_object_put_string(op, "table", class->name);
1560 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1561 json_array_add(operations, op);
1564 /* Let ovsdb-server decide whether to really delete it. */
1566 } else if (row->old != row->new) {
1567 struct json *row_json;
1571 op = json_object_create();
1572 json_object_put_string(op, "op", row->old ? "update" : "insert");
1573 json_object_put_string(op, "table", class->name);
1575 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1577 struct ovsdb_idl_txn_insert *insert;
1581 json_object_put(op, "uuid-name",
1582 json_string_create_nocopy(
1583 uuid_name_from_uuid(&row->uuid)));
1585 insert = xmalloc(sizeof *insert);
1586 insert->dummy = row->uuid;
1587 insert->op_index = operations->u.array.n - 1;
1588 uuid_zero(&insert->real);
1589 hmap_insert(&txn->inserted_rows, &insert->hmap_node,
1590 uuid_hash(&insert->dummy));
1592 row_json = json_object_create();
1593 json_object_put(op, "row", row_json);
1596 BITMAP_FOR_EACH_1 (idx, class->n_columns, row->written) {
1597 const struct ovsdb_idl_column *column =
1598 &class->columns[idx];
1601 || !ovsdb_datum_is_default(&row->new[idx],
1603 json_object_put(row_json, column->name,
1605 ovsdb_datum_to_json(&row->new[idx],
1609 /* If anything really changed, consider it an update.
1610 * We can't suppress not-really-changed values earlier
1611 * or transactions would become nonatomic (see the big
1612 * comment inside ovsdb_idl_txn_write()). */
1613 if (!any_updates && row->old &&
1614 !ovsdb_datum_equals(&row->old[idx], &row->new[idx],
1622 if (!row->old || !shash_is_empty(json_object(row_json))) {
1623 json_array_add(operations, op);
1630 /* Add increment. */
1631 if (txn->inc_table && any_updates) {
1634 txn->inc_index = operations->u.array.n - 1;
1636 op = json_object_create();
1637 json_object_put_string(op, "op", "mutate");
1638 json_object_put_string(op, "table", txn->inc_table);
1639 json_object_put(op, "where",
1640 substitute_uuids(where_uuid_equals(&txn->inc_row),
1642 json_object_put(op, "mutations",
1643 json_array_create_1(
1644 json_array_create_3(
1645 json_string_create(txn->inc_column),
1646 json_string_create("+="),
1647 json_integer_create(1))));
1648 json_array_add(operations, op);
1650 op = json_object_create();
1651 json_object_put_string(op, "op", "select");
1652 json_object_put_string(op, "table", txn->inc_table);
1653 json_object_put(op, "where",
1654 substitute_uuids(where_uuid_equals(&txn->inc_row),
1656 json_object_put(op, "columns",
1657 json_array_create_1(json_string_create(
1659 json_array_add(operations, op);
1662 if (txn->comment.length) {
1663 struct json *op = json_object_create();
1664 json_object_put_string(op, "op", "comment");
1665 json_object_put_string(op, "comment", ds_cstr(&txn->comment));
1666 json_array_add(operations, op);
1670 struct json *op = json_object_create();
1671 json_object_put_string(op, "op", "abort");
1672 json_array_add(operations, op);
1676 txn->status = TXN_UNCHANGED;
1677 json_destroy(operations);
1678 } else if (!jsonrpc_session_send(
1680 jsonrpc_create_request(
1681 "transact", operations, &txn->request_id))) {
1682 hmap_insert(&txn->idl->outstanding_txns, &txn->hmap_node,
1683 json_hash(txn->request_id, 0));
1684 txn->status = TXN_INCOMPLETE;
1686 txn->status = TXN_TRY_AGAIN;
1689 ovsdb_idl_txn_disassemble(txn);
1693 /* Attempts to commit 'txn', blocking until the commit either succeeds or
1694 * fails. Returns the final commit status, which may be any TXN_* value other
1695 * than TXN_INCOMPLETE.
1697 * This function calls ovsdb_idl_run() on 'txn''s IDL, so it may cause the
1698 * return value of ovsdb_idl_get_seqno() to change. */
1699 enum ovsdb_idl_txn_status
1700 ovsdb_idl_txn_commit_block(struct ovsdb_idl_txn *txn)
1702 enum ovsdb_idl_txn_status status;
1705 while ((status = ovsdb_idl_txn_commit(txn)) == TXN_INCOMPLETE) {
1706 ovsdb_idl_run(txn->idl);
1707 ovsdb_idl_wait(txn->idl);
1708 ovsdb_idl_txn_wait(txn);
1714 /* Returns the final (incremented) value of the column in 'txn' that was set to
1715 * be incremented by ovsdb_idl_txn_increment(). 'txn' must have committed
1718 ovsdb_idl_txn_get_increment_new_value(const struct ovsdb_idl_txn *txn)
1720 assert(txn->status == TXN_SUCCESS);
1721 return txn->inc_new_value;
1724 /* Aborts 'txn' without sending it to the database server. This is effective
1725 * only if ovsdb_idl_txn_commit() has not yet been called for 'txn'.
1726 * Otherwise, it has no effect.
1728 * Aborting a transaction doesn't free its memory. Use
1729 * ovsdb_idl_txn_destroy() to do that. */
1731 ovsdb_idl_txn_abort(struct ovsdb_idl_txn *txn)
1733 ovsdb_idl_txn_disassemble(txn);
1734 if (txn->status == TXN_UNCOMMITTED || txn->status == TXN_INCOMPLETE) {
1735 txn->status = TXN_ABORTED;
1739 /* Returns a string that reports the error status for 'txn'. The caller must
1740 * not modify or free the returned string. A call to ovsdb_idl_txn_destroy()
1741 * for 'txn' may free the returned string.
1743 * The return value is ordinarily one of the strings that
1744 * ovsdb_idl_txn_status_to_string() would return, but if the transaction failed
1745 * due to an error reported by the database server, the return value is that
1748 ovsdb_idl_txn_get_error(const struct ovsdb_idl_txn *txn)
1750 if (txn->status != TXN_ERROR) {
1751 return ovsdb_idl_txn_status_to_string(txn->status);
1752 } else if (txn->error) {
1755 return "no error details available";
1760 ovsdb_idl_txn_set_error_json(struct ovsdb_idl_txn *txn,
1761 const struct json *json)
1763 if (txn->error == NULL) {
1764 txn->error = json_to_string(json, JSSF_SORT);
1768 /* For transaction 'txn' that completed successfully, finds and returns the
1769 * permanent UUID that the database assigned to a newly inserted row, given the
1770 * 'uuid' that ovsdb_idl_txn_insert() assigned locally to that row.
1772 * Returns NULL if 'uuid' is not a UUID assigned by ovsdb_idl_txn_insert() or
1773 * if it was assigned by that function and then deleted by
1774 * ovsdb_idl_txn_delete() within the same transaction. (Rows that are inserted
1775 * and then deleted within a single transaction are never sent to the database
1776 * server, so it never assigns them a permanent UUID.) */
1778 ovsdb_idl_txn_get_insert_uuid(const struct ovsdb_idl_txn *txn,
1779 const struct uuid *uuid)
1781 const struct ovsdb_idl_txn_insert *insert;
1783 assert(txn->status == TXN_SUCCESS || txn->status == TXN_UNCHANGED);
1784 HMAP_FOR_EACH_IN_BUCKET (insert, hmap_node,
1785 uuid_hash(uuid), &txn->inserted_rows) {
1786 if (uuid_equals(uuid, &insert->dummy)) {
1787 return &insert->real;
1794 ovsdb_idl_txn_complete(struct ovsdb_idl_txn *txn,
1795 enum ovsdb_idl_txn_status status)
1797 txn->status = status;
1798 hmap_remove(&txn->idl->outstanding_txns, &txn->hmap_node);
1801 /* Writes 'datum' to the specified 'column' in 'row_'. Updates both 'row_'
1802 * itself and the structs derived from it (e.g. the "struct ovsrec_*", for
1805 * 'datum' must have the correct type for its column. The IDL does not check
1806 * that it meets schema constraints, but ovsdb-server will do so at commit time
1807 * so it had better be correct.
1809 * A transaction must be in progress. Replication of 'column' must not have
1810 * been disabled (by calling ovsdb_idl_omit()).
1812 * Usually this function is used indirectly through one of the "set" functions
1813 * generated by ovsdb-idlc.
1815 * Takes ownership of what 'datum' points to (and in some cases destroys that
1816 * data before returning) but makes a copy of 'datum' itself. (Commonly
1817 * 'datum' is on the caller's stack.) */
1819 ovsdb_idl_txn_write(const struct ovsdb_idl_row *row_,
1820 const struct ovsdb_idl_column *column,
1821 struct ovsdb_datum *datum)
1823 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
1824 const struct ovsdb_idl_table_class *class;
1827 if (ovsdb_idl_row_is_synthetic(row)) {
1828 ovsdb_datum_destroy(datum, &column->type);
1832 class = row->table->class;
1833 column_idx = column - class->columns;
1835 assert(row->new != NULL);
1836 assert(column_idx < class->n_columns);
1837 assert(row->old == NULL ||
1838 row->table->modes[column_idx] & OVSDB_IDL_MONITOR);
1840 /* If this is a write-only column and the datum being written is the same
1841 * as the one already there, just skip the update entirely. This is worth
1842 * optimizing because we have a lot of columns that get periodically
1843 * refreshed into the database but don't actually change that often.
1845 * We don't do this for read/write columns because that would break
1846 * atomicity of transactions--some other client might have written a
1847 * different value in that column since we read it. (But if a whole
1848 * transaction only does writes of existing values, without making any real
1849 * changes, we will drop the whole transaction later in
1850 * ovsdb_idl_txn_commit().) */
1851 if (row->table->modes[column_idx] == OVSDB_IDL_MONITOR
1852 && ovsdb_datum_equals(ovsdb_idl_read(row, column),
1853 datum, &column->type)) {
1854 ovsdb_datum_destroy(datum, &column->type);
1858 if (hmap_node_is_null(&row->txn_node)) {
1859 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
1860 uuid_hash(&row->uuid));
1862 if (row->old == row->new) {
1863 row->new = xmalloc(class->n_columns * sizeof *row->new);
1865 if (!row->written) {
1866 row->written = bitmap_allocate(class->n_columns);
1868 if (bitmap_is_set(row->written, column_idx)) {
1869 ovsdb_datum_destroy(&row->new[column_idx], &column->type);
1871 bitmap_set1(row->written, column_idx);
1873 row->new[column_idx] = *datum;
1874 (column->unparse)(row);
1875 (column->parse)(row, &row->new[column_idx]);
1878 /* Causes the original contents of 'column' in 'row_' to be verified as a
1879 * prerequisite to completing the transaction. That is, if 'column' in 'row_'
1880 * changed (or if 'row_' was deleted) between the time that the IDL originally
1881 * read its contents and the time that the transaction commits, then the
1882 * transaction aborts and ovsdb_idl_txn_commit() returns TXN_AGAIN_WAIT or
1883 * TXN_AGAIN_NOW (depending on whether the database change has already been
1886 * The intention is that, to ensure that no transaction commits based on dirty
1887 * reads, an application should call ovsdb_idl_txn_verify() on each data item
1888 * read as part of a read-modify-write operation.
1890 * In some cases ovsdb_idl_txn_verify() reduces to a no-op, because the current
1891 * value of 'column' is already known:
1893 * - If 'row_' is a row created by the current transaction (returned by
1894 * ovsdb_idl_txn_insert()).
1896 * - If 'column' has already been modified (with ovsdb_idl_txn_write())
1897 * within the current transaction.
1899 * Because of the latter property, always call ovsdb_idl_txn_verify() *before*
1900 * ovsdb_idl_txn_write() for a given read-modify-write.
1902 * A transaction must be in progress.
1904 * Usually this function is used indirectly through one of the "verify"
1905 * functions generated by ovsdb-idlc. */
1907 ovsdb_idl_txn_verify(const struct ovsdb_idl_row *row_,
1908 const struct ovsdb_idl_column *column)
1910 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
1911 const struct ovsdb_idl_table_class *class;
1914 if (ovsdb_idl_row_is_synthetic(row)) {
1918 class = row->table->class;
1919 column_idx = column - class->columns;
1921 assert(row->new != NULL);
1922 assert(row->old == NULL ||
1923 row->table->modes[column_idx] & OVSDB_IDL_MONITOR);
1925 || (row->written && bitmap_is_set(row->written, column_idx))) {
1929 if (hmap_node_is_null(&row->txn_node)) {
1930 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
1931 uuid_hash(&row->uuid));
1933 if (!row->prereqs) {
1934 row->prereqs = bitmap_allocate(class->n_columns);
1936 bitmap_set1(row->prereqs, column_idx);
1939 /* Deletes 'row_' from its table. May free 'row_', so it must not be
1940 * accessed afterward.
1942 * A transaction must be in progress.
1944 * Usually this function is used indirectly through one of the "delete"
1945 * functions generated by ovsdb-idlc. */
1947 ovsdb_idl_txn_delete(const struct ovsdb_idl_row *row_)
1949 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
1951 if (ovsdb_idl_row_is_synthetic(row)) {
1955 assert(row->new != NULL);
1957 ovsdb_idl_row_unparse(row);
1958 ovsdb_idl_row_clear_new(row);
1959 assert(!row->prereqs);
1960 hmap_remove(&row->table->rows, &row->hmap_node);
1961 hmap_remove(&row->table->idl->txn->txn_rows, &row->txn_node);
1965 if (hmap_node_is_null(&row->txn_node)) {
1966 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
1967 uuid_hash(&row->uuid));
1969 ovsdb_idl_row_clear_new(row);
1973 /* Inserts and returns a new row in the table with the specified 'class' in the
1974 * database with open transaction 'txn'.
1976 * The new row is assigned a provisional UUID. If 'uuid' is null then one is
1977 * randomly generated; otherwise 'uuid' should specify a randomly generated
1978 * UUID not otherwise in use. ovsdb-server will assign a different UUID when
1979 * 'txn' is committed, but the IDL will replace any uses of the provisional
1980 * UUID in the data to be to be committed by the UUID assigned by
1983 * Usually this function is used indirectly through one of the "insert"
1984 * functions generated by ovsdb-idlc. */
1985 const struct ovsdb_idl_row *
1986 ovsdb_idl_txn_insert(struct ovsdb_idl_txn *txn,
1987 const struct ovsdb_idl_table_class *class,
1988 const struct uuid *uuid)
1990 struct ovsdb_idl_row *row = ovsdb_idl_row_create__(class);
1993 assert(!ovsdb_idl_txn_get_row(txn, uuid));
1996 uuid_generate(&row->uuid);
1999 row->table = ovsdb_idl_table_from_class(txn->idl, class);
2000 row->new = xmalloc(class->n_columns * sizeof *row->new);
2001 hmap_insert(&row->table->rows, &row->hmap_node, uuid_hash(&row->uuid));
2002 hmap_insert(&txn->txn_rows, &row->txn_node, uuid_hash(&row->uuid));
2007 ovsdb_idl_txn_abort_all(struct ovsdb_idl *idl)
2009 struct ovsdb_idl_txn *txn;
2011 HMAP_FOR_EACH (txn, hmap_node, &idl->outstanding_txns) {
2012 ovsdb_idl_txn_complete(txn, TXN_TRY_AGAIN);
2016 static struct ovsdb_idl_txn *
2017 ovsdb_idl_txn_find(struct ovsdb_idl *idl, const struct json *id)
2019 struct ovsdb_idl_txn *txn;
2021 HMAP_FOR_EACH_WITH_HASH (txn, hmap_node,
2022 json_hash(id, 0), &idl->outstanding_txns) {
2023 if (json_equal(id, txn->request_id)) {
2031 check_json_type(const struct json *json, enum json_type type, const char *name)
2034 VLOG_WARN_RL(&syntax_rl, "%s is missing", name);
2036 } else if (json->type != type) {
2037 VLOG_WARN_RL(&syntax_rl, "%s is %s instead of %s",
2038 name, json_type_to_string(json->type),
2039 json_type_to_string(type));
2047 ovsdb_idl_txn_process_inc_reply(struct ovsdb_idl_txn *txn,
2048 const struct json_array *results)
2050 struct json *count, *rows, *row, *column;
2051 struct shash *mutate, *select;
2053 if (txn->inc_index + 2 > results->n) {
2054 VLOG_WARN_RL(&syntax_rl, "reply does not contain enough operations "
2055 "for increment (has %zu, needs %u)",
2056 results->n, txn->inc_index + 2);
2060 /* We know that this is a JSON object because the loop in
2061 * ovsdb_idl_txn_process_reply() checked. */
2062 mutate = json_object(results->elems[txn->inc_index]);
2063 count = shash_find_data(mutate, "count");
2064 if (!check_json_type(count, JSON_INTEGER, "\"mutate\" reply \"count\"")) {
2067 if (count->u.integer != 1) {
2068 VLOG_WARN_RL(&syntax_rl,
2069 "\"mutate\" reply \"count\" is %lld instead of 1",
2074 select = json_object(results->elems[txn->inc_index + 1]);
2075 rows = shash_find_data(select, "rows");
2076 if (!check_json_type(rows, JSON_ARRAY, "\"select\" reply \"rows\"")) {
2079 if (rows->u.array.n != 1) {
2080 VLOG_WARN_RL(&syntax_rl, "\"select\" reply \"rows\" has %zu elements "
2085 row = rows->u.array.elems[0];
2086 if (!check_json_type(row, JSON_OBJECT, "\"select\" reply row")) {
2089 column = shash_find_data(json_object(row), txn->inc_column);
2090 if (!check_json_type(column, JSON_INTEGER,
2091 "\"select\" reply inc column")) {
2094 txn->inc_new_value = column->u.integer;
2099 ovsdb_idl_txn_process_insert_reply(struct ovsdb_idl_txn_insert *insert,
2100 const struct json_array *results)
2102 static const struct ovsdb_base_type uuid_type = OVSDB_BASE_UUID_INIT;
2103 struct ovsdb_error *error;
2104 struct json *json_uuid;
2105 union ovsdb_atom uuid;
2106 struct shash *reply;
2108 if (insert->op_index >= results->n) {
2109 VLOG_WARN_RL(&syntax_rl, "reply does not contain enough operations "
2110 "for insert (has %zu, needs %u)",
2111 results->n, insert->op_index);
2115 /* We know that this is a JSON object because the loop in
2116 * ovsdb_idl_txn_process_reply() checked. */
2117 reply = json_object(results->elems[insert->op_index]);
2118 json_uuid = shash_find_data(reply, "uuid");
2119 if (!check_json_type(json_uuid, JSON_ARRAY, "\"insert\" reply \"uuid\"")) {
2123 error = ovsdb_atom_from_json(&uuid, &uuid_type, json_uuid, NULL);
2125 char *s = ovsdb_error_to_string(error);
2126 VLOG_WARN_RL(&syntax_rl, "\"insert\" reply \"uuid\" is not a JSON "
2132 insert->real = uuid.uuid;
2138 ovsdb_idl_txn_process_reply(struct ovsdb_idl *idl,
2139 const struct jsonrpc_msg *msg)
2141 struct ovsdb_idl_txn *txn;
2142 enum ovsdb_idl_txn_status status;
2144 txn = ovsdb_idl_txn_find(idl, msg->id);
2149 if (msg->type == JSONRPC_ERROR) {
2151 } else if (msg->result->type != JSON_ARRAY) {
2152 VLOG_WARN_RL(&syntax_rl, "reply to \"transact\" is not JSON array");
2155 struct json_array *ops = &msg->result->u.array;
2156 int hard_errors = 0;
2157 int soft_errors = 0;
2158 int lock_errors = 0;
2161 for (i = 0; i < ops->n; i++) {
2162 struct json *op = ops->elems[i];
2164 if (op->type == JSON_NULL) {
2165 /* This isn't an error in itself but indicates that some prior
2166 * operation failed, so make sure that we know about it. */
2168 } else if (op->type == JSON_OBJECT) {
2171 error = shash_find_data(json_object(op), "error");
2173 if (error->type == JSON_STRING) {
2174 if (!strcmp(error->u.string, "timed out")) {
2176 } else if (!strcmp(error->u.string, "not owner")) {
2178 } else if (strcmp(error->u.string, "aborted")) {
2180 ovsdb_idl_txn_set_error_json(txn, op);
2184 ovsdb_idl_txn_set_error_json(txn, op);
2185 VLOG_WARN_RL(&syntax_rl,
2186 "\"error\" in reply is not JSON string");
2191 ovsdb_idl_txn_set_error_json(txn, op);
2192 VLOG_WARN_RL(&syntax_rl,
2193 "operation reply is not JSON null or object");
2197 if (!soft_errors && !hard_errors && !lock_errors) {
2198 struct ovsdb_idl_txn_insert *insert;
2200 if (txn->inc_table && !ovsdb_idl_txn_process_inc_reply(txn, ops)) {
2204 HMAP_FOR_EACH (insert, hmap_node, &txn->inserted_rows) {
2205 if (!ovsdb_idl_txn_process_insert_reply(insert, ops)) {
2211 status = (hard_errors ? TXN_ERROR
2212 : lock_errors ? TXN_NOT_LOCKED
2213 : soft_errors ? TXN_TRY_AGAIN
2217 ovsdb_idl_txn_complete(txn, status);
2221 /* Returns the transaction currently active for 'row''s IDL. A transaction
2222 * must currently be active. */
2223 struct ovsdb_idl_txn *
2224 ovsdb_idl_txn_get(const struct ovsdb_idl_row *row)
2226 struct ovsdb_idl_txn *txn = row->table->idl->txn;
2227 assert(txn != NULL);
2231 /* Returns the IDL on which 'txn' acts. */
2233 ovsdb_idl_txn_get_idl (struct ovsdb_idl_txn *txn)
2238 /* If 'lock_name' is nonnull, configures 'idl' to obtain the named lock from
2239 * the database server and to avoid modifying the database when the lock cannot
2240 * be acquired (that is, when another client has the same lock).
2242 * If 'lock_name' is NULL, drops the locking requirement and releases the
2245 ovsdb_idl_set_lock(struct ovsdb_idl *idl, const char *lock_name)
2248 assert(hmap_is_empty(&idl->outstanding_txns));
2250 if (idl->lock_name && (!lock_name || strcmp(lock_name, idl->lock_name))) {
2251 /* Release previous lock. */
2252 ovsdb_idl_send_unlock_request(idl);
2253 free(idl->lock_name);
2254 idl->lock_name = NULL;
2255 idl->is_lock_contended = false;
2258 if (lock_name && !idl->lock_name) {
2259 /* Acquire new lock. */
2260 idl->lock_name = xstrdup(lock_name);
2261 ovsdb_idl_send_lock_request(idl);
2265 /* Returns true if 'idl' is configured to obtain a lock and owns that lock.
2267 * Locking and unlocking happens asynchronously from the database client's
2268 * point of view, so the information is only useful for optimization (e.g. if
2269 * the client doesn't have the lock then there's no point in trying to write to
2272 ovsdb_idl_has_lock(const struct ovsdb_idl *idl)
2274 return idl->has_lock;
2277 /* Returns true if 'idl' is configured to obtain a lock but the database server
2278 * has indicated that some other client already owns the requested lock. */
2280 ovsdb_idl_is_lock_contended(const struct ovsdb_idl *idl)
2282 return idl->is_lock_contended;
2286 ovsdb_idl_update_has_lock(struct ovsdb_idl *idl, bool new_has_lock)
2288 if (new_has_lock && !idl->has_lock) {
2289 if (!idl->monitor_request_id) {
2290 idl->change_seqno++;
2292 /* We're waiting for a monitor reply, so don't signal that the
2293 * database changed. The monitor reply will increment change_seqno
2296 idl->is_lock_contended = false;
2298 idl->has_lock = new_has_lock;
2302 ovsdb_idl_send_lock_request__(struct ovsdb_idl *idl, const char *method,
2305 ovsdb_idl_update_has_lock(idl, false);
2307 json_destroy(idl->lock_request_id);
2308 idl->lock_request_id = NULL;
2310 if (jsonrpc_session_is_connected(idl->session)) {
2311 struct json *params;
2313 params = json_array_create_1(json_string_create(idl->lock_name));
2314 jsonrpc_session_send(idl->session,
2315 jsonrpc_create_request(method, params, idp));
2320 ovsdb_idl_send_lock_request(struct ovsdb_idl *idl)
2322 ovsdb_idl_send_lock_request__(idl, "lock", &idl->lock_request_id);
2326 ovsdb_idl_send_unlock_request(struct ovsdb_idl *idl)
2328 ovsdb_idl_send_lock_request__(idl, "unlock", NULL);
2332 ovsdb_idl_parse_lock_reply(struct ovsdb_idl *idl, const struct json *result)
2336 json_destroy(idl->lock_request_id);
2337 idl->lock_request_id = NULL;
2339 if (result->type == JSON_OBJECT) {
2340 const struct json *locked;
2342 locked = shash_find_data(json_object(result), "locked");
2343 got_lock = locked && locked->type == JSON_TRUE;
2348 ovsdb_idl_update_has_lock(idl, got_lock);
2350 idl->is_lock_contended = true;
2355 ovsdb_idl_parse_lock_notify(struct ovsdb_idl *idl,
2356 const struct json *params,
2360 && params->type == JSON_ARRAY
2361 && json_array(params)->n > 0
2362 && json_array(params)->elems[0]->type == JSON_STRING) {
2363 const char *lock_name = json_string(json_array(params)->elems[0]);
2365 if (!strcmp(idl->lock_name, lock_name)) {
2366 ovsdb_idl_update_has_lock(idl, new_has_lock);
2367 if (!new_has_lock) {
2368 idl->is_lock_contended = true;