1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013 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"
26 #include "dynamic-string.h"
27 #include "fatal-signal.h"
30 #include "ovsdb-data.h"
31 #include "ovsdb-error.h"
32 #include "ovsdb-idl-provider.h"
33 #include "poll-loop.h"
38 VLOG_DEFINE_THIS_MODULE(ovsdb_idl);
40 /* An arc from one idl_row to another. When row A contains a UUID that
41 * references row B, this is represented by an arc from A (the source) to B
44 * Arcs from a row to itself are omitted, that is, src and dst are always
47 * Arcs are never duplicated, that is, even if there are multiple references
48 * from A to B, there is only a single arc from A to B.
50 * Arcs are directed: an arc from A to B is the converse of an an arc from B to
51 * A. Both an arc and its converse may both be present, if each row refers
52 * to the other circularly.
54 * The source and destination row may be in the same table or in different
57 struct ovsdb_idl_arc {
58 struct list src_node; /* In src->src_arcs list. */
59 struct list dst_node; /* In dst->dst_arcs list. */
60 struct ovsdb_idl_row *src; /* Source row. */
61 struct ovsdb_idl_row *dst; /* Destination row. */
65 const struct ovsdb_idl_class *class;
66 struct jsonrpc_session *session;
67 struct shash table_by_name;
68 struct ovsdb_idl_table *tables; /* Contains "struct ovsdb_idl_table *"s.*/
69 struct json *monitor_request_id;
70 unsigned int last_monitor_request_seqno;
71 unsigned int change_seqno;
72 bool verify_write_only;
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;
96 const char *inc_table;
97 const char *inc_column;
99 unsigned int inc_index;
100 int64_t inc_new_value;
103 struct hmap inserted_rows; /* Contains "struct ovsdb_idl_txn_insert"s. */
106 struct ovsdb_idl_txn_insert {
107 struct hmap_node hmap_node; /* In struct ovsdb_idl_txn's inserted_rows. */
108 struct uuid dummy; /* Dummy UUID used locally. */
109 int op_index; /* Index into transaction's operation array. */
110 struct uuid real; /* Real UUID used by database server. */
113 static struct vlog_rate_limit syntax_rl = VLOG_RATE_LIMIT_INIT(1, 5);
114 static struct vlog_rate_limit semantic_rl = VLOG_RATE_LIMIT_INIT(1, 5);
116 static void ovsdb_idl_clear(struct ovsdb_idl *);
117 static void ovsdb_idl_send_monitor_request(struct ovsdb_idl *);
118 static void ovsdb_idl_parse_update(struct ovsdb_idl *, const struct json *);
119 static struct ovsdb_error *ovsdb_idl_parse_update__(struct ovsdb_idl *,
120 const struct json *);
121 static bool ovsdb_idl_process_update(struct ovsdb_idl_table *,
123 const struct json *old,
124 const struct json *new);
125 static void ovsdb_idl_insert_row(struct ovsdb_idl_row *, const struct json *);
126 static void ovsdb_idl_delete_row(struct ovsdb_idl_row *);
127 static bool ovsdb_idl_modify_row(struct ovsdb_idl_row *, const struct json *);
129 static bool ovsdb_idl_row_is_orphan(const struct ovsdb_idl_row *);
130 static struct ovsdb_idl_row *ovsdb_idl_row_create__(
131 const struct ovsdb_idl_table_class *);
132 static struct ovsdb_idl_row *ovsdb_idl_row_create(struct ovsdb_idl_table *,
133 const struct uuid *);
134 static void ovsdb_idl_row_destroy(struct ovsdb_idl_row *);
136 static void ovsdb_idl_row_parse(struct ovsdb_idl_row *);
137 static void ovsdb_idl_row_unparse(struct ovsdb_idl_row *);
138 static void ovsdb_idl_row_clear_old(struct ovsdb_idl_row *);
139 static void ovsdb_idl_row_clear_new(struct ovsdb_idl_row *);
141 static void ovsdb_idl_txn_abort_all(struct ovsdb_idl *);
142 static bool ovsdb_idl_txn_process_reply(struct ovsdb_idl *,
143 const struct jsonrpc_msg *msg);
145 static void ovsdb_idl_send_lock_request(struct ovsdb_idl *);
146 static void ovsdb_idl_send_unlock_request(struct ovsdb_idl *);
147 static void ovsdb_idl_parse_lock_reply(struct ovsdb_idl *,
148 const struct json *);
149 static void ovsdb_idl_parse_lock_notify(struct ovsdb_idl *,
150 const struct json *params,
153 /* Creates and returns a connection to database 'remote', which should be in a
154 * form acceptable to jsonrpc_session_open(). The connection will maintain an
155 * in-memory replica of the remote database whose schema is described by
156 * 'class'. (Ordinarily 'class' is compiled from an OVSDB schema automatically
159 * Passes 'retry' to jsonrpc_session_open(). See that function for
162 * If 'monitor_everything_by_default' is true, then everything in the remote
163 * database will be replicated by default. ovsdb_idl_omit() and
164 * ovsdb_idl_omit_alert() may be used to selectively drop some columns from
167 * If 'monitor_everything_by_default' is false, then no columns or tables will
168 * be replicated by default. ovsdb_idl_add_column() and ovsdb_idl_add_table()
169 * must be used to choose some columns or tables to replicate.
172 ovsdb_idl_create(const char *remote, const struct ovsdb_idl_class *class,
173 bool monitor_everything_by_default, bool retry)
175 struct ovsdb_idl *idl;
176 uint8_t default_mode;
179 default_mode = (monitor_everything_by_default
180 ? OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT
183 idl = xzalloc(sizeof *idl);
185 idl->session = jsonrpc_session_open(remote, retry);
186 shash_init(&idl->table_by_name);
187 idl->tables = xmalloc(class->n_tables * sizeof *idl->tables);
188 for (i = 0; i < class->n_tables; i++) {
189 const struct ovsdb_idl_table_class *tc = &class->tables[i];
190 struct ovsdb_idl_table *table = &idl->tables[i];
193 shash_add_assert(&idl->table_by_name, tc->name, table);
195 table->modes = xmalloc(tc->n_columns);
196 memset(table->modes, default_mode, tc->n_columns);
197 table->need_table = false;
198 shash_init(&table->columns);
199 for (j = 0; j < tc->n_columns; j++) {
200 const struct ovsdb_idl_column *column = &tc->columns[j];
202 shash_add_assert(&table->columns, column->name, column);
204 hmap_init(&table->rows);
207 idl->last_monitor_request_seqno = UINT_MAX;
208 hmap_init(&idl->outstanding_txns);
213 /* Destroys 'idl' and all of the data structures that it manages. */
215 ovsdb_idl_destroy(struct ovsdb_idl *idl)
220 ovs_assert(!idl->txn);
221 ovsdb_idl_clear(idl);
222 jsonrpc_session_close(idl->session);
224 for (i = 0; i < idl->class->n_tables; i++) {
225 struct ovsdb_idl_table *table = &idl->tables[i];
226 shash_destroy(&table->columns);
227 hmap_destroy(&table->rows);
230 shash_destroy(&idl->table_by_name);
232 json_destroy(idl->monitor_request_id);
233 free(idl->lock_name);
234 json_destroy(idl->lock_request_id);
235 hmap_destroy(&idl->outstanding_txns);
241 ovsdb_idl_clear(struct ovsdb_idl *idl)
243 bool changed = false;
246 for (i = 0; i < idl->class->n_tables; i++) {
247 struct ovsdb_idl_table *table = &idl->tables[i];
248 struct ovsdb_idl_row *row, *next_row;
250 if (hmap_is_empty(&table->rows)) {
255 HMAP_FOR_EACH_SAFE (row, next_row, hmap_node, &table->rows) {
256 struct ovsdb_idl_arc *arc, *next_arc;
258 if (!ovsdb_idl_row_is_orphan(row)) {
259 ovsdb_idl_row_unparse(row);
261 LIST_FOR_EACH_SAFE (arc, next_arc, src_node, &row->src_arcs) {
264 /* No need to do anything with dst_arcs: some node has those arcs
265 * as forward arcs and will destroy them itself. */
267 ovsdb_idl_row_destroy(row);
276 /* Processes a batch of messages from the database server on 'idl'. This may
277 * cause the IDL's contents to change. The client may check for that with
278 * ovsdb_idl_get_seqno(). */
280 ovsdb_idl_run(struct ovsdb_idl *idl)
284 ovs_assert(!idl->txn);
285 jsonrpc_session_run(idl->session);
286 for (i = 0; jsonrpc_session_is_connected(idl->session) && i < 50; i++) {
287 struct jsonrpc_msg *msg;
290 seqno = jsonrpc_session_get_seqno(idl->session);
291 if (idl->last_monitor_request_seqno != seqno) {
292 idl->last_monitor_request_seqno = seqno;
293 ovsdb_idl_txn_abort_all(idl);
294 ovsdb_idl_send_monitor_request(idl);
295 if (idl->lock_name) {
296 ovsdb_idl_send_lock_request(idl);
301 msg = jsonrpc_session_recv(idl->session);
306 if (msg->type == JSONRPC_NOTIFY
307 && !strcmp(msg->method, "update")
308 && msg->params->type == JSON_ARRAY
309 && msg->params->u.array.n == 2
310 && msg->params->u.array.elems[0]->type == JSON_NULL) {
311 /* Database contents changed. */
312 ovsdb_idl_parse_update(idl, msg->params->u.array.elems[1]);
313 } else if (msg->type == JSONRPC_REPLY
314 && idl->monitor_request_id
315 && json_equal(idl->monitor_request_id, msg->id)) {
316 /* Reply to our "monitor" request. */
318 json_destroy(idl->monitor_request_id);
319 idl->monitor_request_id = NULL;
320 ovsdb_idl_clear(idl);
321 ovsdb_idl_parse_update(idl, msg->result);
322 } else if (msg->type == JSONRPC_REPLY
323 && idl->lock_request_id
324 && json_equal(idl->lock_request_id, msg->id)) {
325 /* Reply to our "lock" request. */
326 ovsdb_idl_parse_lock_reply(idl, msg->result);
327 } else if (msg->type == JSONRPC_NOTIFY
328 && !strcmp(msg->method, "locked")) {
329 /* We got our lock. */
330 ovsdb_idl_parse_lock_notify(idl, msg->params, true);
331 } else if (msg->type == JSONRPC_NOTIFY
332 && !strcmp(msg->method, "stolen")) {
333 /* Someone else stole our lock. */
334 ovsdb_idl_parse_lock_notify(idl, msg->params, false);
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 /* Some IDL users should only write to write-only columns. Furthermore,
406 * writing to a column which is not write-only can cause serious performance
407 * degradations for these users. This function causes 'idl' to reject writes
408 * to columns which are not marked write only using ovsdb_idl_omit_alert(). */
410 ovsdb_idl_verify_write_only(struct ovsdb_idl *idl)
412 idl->verify_write_only = true;
416 ovsdb_idl_is_alive(const struct ovsdb_idl *idl)
418 return jsonrpc_session_is_alive(idl->session);
422 ovsdb_idl_get_last_error(const struct ovsdb_idl *idl)
424 return jsonrpc_session_get_last_error(idl->session);
427 static unsigned char *
428 ovsdb_idl_get_mode(struct ovsdb_idl *idl,
429 const struct ovsdb_idl_column *column)
433 ovs_assert(!idl->change_seqno);
435 for (i = 0; i < idl->class->n_tables; i++) {
436 const struct ovsdb_idl_table *table = &idl->tables[i];
437 const struct ovsdb_idl_table_class *tc = table->class;
439 if (column >= tc->columns && column < &tc->columns[tc->n_columns]) {
440 return &table->modes[column - tc->columns];
448 add_ref_table(struct ovsdb_idl *idl, const struct ovsdb_base_type *base)
450 if (base->type == OVSDB_TYPE_UUID && base->u.uuid.refTableName) {
451 struct ovsdb_idl_table *table;
453 table = shash_find_data(&idl->table_by_name,
454 base->u.uuid.refTableName);
456 table->need_table = true;
458 VLOG_WARN("%s IDL class missing referenced table %s",
459 idl->class->database, base->u.uuid.refTableName);
464 /* Turns on OVSDB_IDL_MONITOR and OVSDB_IDL_ALERT for 'column' in 'idl'. Also
465 * ensures that any tables referenced by 'column' will be replicated, even if
466 * no columns in that table are selected for replication (see
467 * ovsdb_idl_add_table() for more information).
469 * This function is only useful if 'monitor_everything_by_default' was false in
470 * the call to ovsdb_idl_create(). This function should be called between
471 * ovsdb_idl_create() and the first call to ovsdb_idl_run().
474 ovsdb_idl_add_column(struct ovsdb_idl *idl,
475 const struct ovsdb_idl_column *column)
477 *ovsdb_idl_get_mode(idl, column) = OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT;
478 add_ref_table(idl, &column->type.key);
479 add_ref_table(idl, &column->type.value);
482 /* Ensures that the table with class 'tc' will be replicated on 'idl' even if
483 * no columns are selected for replication. This can be useful because it
484 * allows 'idl' to keep track of what rows in the table actually exist, which
485 * in turn allows columns that reference the table to have accurate contents.
486 * (The IDL presents the database with references to rows that do not exist
489 * This function is only useful if 'monitor_everything_by_default' was false in
490 * the call to ovsdb_idl_create(). This function should be called between
491 * ovsdb_idl_create() and the first call to ovsdb_idl_run().
494 ovsdb_idl_add_table(struct ovsdb_idl *idl,
495 const struct ovsdb_idl_table_class *tc)
499 for (i = 0; i < idl->class->n_tables; i++) {
500 struct ovsdb_idl_table *table = &idl->tables[i];
502 if (table->class == tc) {
503 table->need_table = true;
511 /* Turns off OVSDB_IDL_ALERT for 'column' in 'idl'.
513 * This function should be called between ovsdb_idl_create() and the first call
514 * to ovsdb_idl_run().
517 ovsdb_idl_omit_alert(struct ovsdb_idl *idl,
518 const struct ovsdb_idl_column *column)
520 *ovsdb_idl_get_mode(idl, column) &= ~OVSDB_IDL_ALERT;
523 /* Sets the mode for 'column' in 'idl' to 0. See the big comment above
524 * OVSDB_IDL_MONITOR for details.
526 * This function should be called between ovsdb_idl_create() and the first call
527 * to ovsdb_idl_run().
530 ovsdb_idl_omit(struct ovsdb_idl *idl, const struct ovsdb_idl_column *column)
532 *ovsdb_idl_get_mode(idl, column) = 0;
536 ovsdb_idl_send_monitor_request(struct ovsdb_idl *idl)
538 struct json *monitor_requests;
539 struct jsonrpc_msg *msg;
542 monitor_requests = json_object_create();
543 for (i = 0; i < idl->class->n_tables; i++) {
544 const struct ovsdb_idl_table *table = &idl->tables[i];
545 const struct ovsdb_idl_table_class *tc = table->class;
546 struct json *monitor_request, *columns;
549 columns = table->need_table ? json_array_create_empty() : NULL;
550 for (j = 0; j < tc->n_columns; j++) {
551 const struct ovsdb_idl_column *column = &tc->columns[j];
552 if (table->modes[j] & OVSDB_IDL_MONITOR) {
554 columns = json_array_create_empty();
556 json_array_add(columns, json_string_create(column->name));
561 monitor_request = json_object_create();
562 json_object_put(monitor_request, "columns", columns);
563 json_object_put(monitor_requests, tc->name, monitor_request);
567 json_destroy(idl->monitor_request_id);
568 msg = jsonrpc_create_request(
570 json_array_create_3(json_string_create(idl->class->database),
571 json_null_create(), monitor_requests),
572 &idl->monitor_request_id);
573 jsonrpc_session_send(idl->session, msg);
577 ovsdb_idl_parse_update(struct ovsdb_idl *idl, const struct json *table_updates)
579 struct ovsdb_error *error = ovsdb_idl_parse_update__(idl, table_updates);
581 if (!VLOG_DROP_WARN(&syntax_rl)) {
582 char *s = ovsdb_error_to_string(error);
583 VLOG_WARN_RL(&syntax_rl, "%s", s);
586 ovsdb_error_destroy(error);
590 static struct ovsdb_error *
591 ovsdb_idl_parse_update__(struct ovsdb_idl *idl,
592 const struct json *table_updates)
594 const struct shash_node *tables_node;
596 if (table_updates->type != JSON_OBJECT) {
597 return ovsdb_syntax_error(table_updates, NULL,
598 "<table-updates> is not an object");
600 SHASH_FOR_EACH (tables_node, json_object(table_updates)) {
601 const struct json *table_update = tables_node->data;
602 const struct shash_node *table_node;
603 struct ovsdb_idl_table *table;
605 table = shash_find_data(&idl->table_by_name, tables_node->name);
607 return ovsdb_syntax_error(
609 "<table-updates> includes unknown table \"%s\"",
613 if (table_update->type != JSON_OBJECT) {
614 return ovsdb_syntax_error(table_update, NULL,
615 "<table-update> for table \"%s\" is "
616 "not an object", table->class->name);
618 SHASH_FOR_EACH (table_node, json_object(table_update)) {
619 const struct json *row_update = table_node->data;
620 const struct json *old_json, *new_json;
623 if (!uuid_from_string(&uuid, table_node->name)) {
624 return ovsdb_syntax_error(table_update, NULL,
625 "<table-update> for table \"%s\" "
627 "\"%s\" as member name",
631 if (row_update->type != JSON_OBJECT) {
632 return ovsdb_syntax_error(row_update, NULL,
633 "<table-update> for table \"%s\" "
634 "contains <row-update> for %s that "
640 old_json = shash_find_data(json_object(row_update), "old");
641 new_json = shash_find_data(json_object(row_update), "new");
642 if (old_json && old_json->type != JSON_OBJECT) {
643 return ovsdb_syntax_error(old_json, NULL,
644 "\"old\" <row> is not object");
645 } else if (new_json && new_json->type != JSON_OBJECT) {
646 return ovsdb_syntax_error(new_json, NULL,
647 "\"new\" <row> is not object");
648 } else if ((old_json != NULL) + (new_json != NULL)
649 != shash_count(json_object(row_update))) {
650 return ovsdb_syntax_error(row_update, NULL,
651 "<row-update> contains unexpected "
653 } else if (!old_json && !new_json) {
654 return ovsdb_syntax_error(row_update, NULL,
655 "<row-update> missing \"old\" "
656 "and \"new\" members");
659 if (ovsdb_idl_process_update(table, &uuid, old_json, new_json)) {
668 static struct ovsdb_idl_row *
669 ovsdb_idl_get_row(struct ovsdb_idl_table *table, const struct uuid *uuid)
671 struct ovsdb_idl_row *row;
673 HMAP_FOR_EACH_WITH_HASH (row, hmap_node, uuid_hash(uuid), &table->rows) {
674 if (uuid_equals(&row->uuid, uuid)) {
681 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
684 ovsdb_idl_process_update(struct ovsdb_idl_table *table,
685 const struct uuid *uuid, const struct json *old,
686 const struct json *new)
688 struct ovsdb_idl_row *row;
690 row = ovsdb_idl_get_row(table, uuid);
693 if (row && !ovsdb_idl_row_is_orphan(row)) {
694 /* XXX perhaps we should check the 'old' values? */
695 ovsdb_idl_delete_row(row);
697 VLOG_WARN_RL(&semantic_rl, "cannot delete missing row "UUID_FMT" "
699 UUID_ARGS(uuid), table->class->name);
705 ovsdb_idl_insert_row(ovsdb_idl_row_create(table, uuid), new);
706 } else if (ovsdb_idl_row_is_orphan(row)) {
707 ovsdb_idl_insert_row(row, new);
709 VLOG_WARN_RL(&semantic_rl, "cannot add existing row "UUID_FMT" to "
710 "table %s", UUID_ARGS(uuid), table->class->name);
711 return ovsdb_idl_modify_row(row, new);
716 /* XXX perhaps we should check the 'old' values? */
717 if (!ovsdb_idl_row_is_orphan(row)) {
718 return ovsdb_idl_modify_row(row, new);
720 VLOG_WARN_RL(&semantic_rl, "cannot modify missing but "
721 "referenced row "UUID_FMT" in table %s",
722 UUID_ARGS(uuid), table->class->name);
723 ovsdb_idl_insert_row(row, new);
726 VLOG_WARN_RL(&semantic_rl, "cannot modify missing row "UUID_FMT" "
727 "in table %s", UUID_ARGS(uuid), table->class->name);
728 ovsdb_idl_insert_row(ovsdb_idl_row_create(table, uuid), new);
735 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
738 ovsdb_idl_row_update(struct ovsdb_idl_row *row, const struct json *row_json)
740 struct ovsdb_idl_table *table = row->table;
741 struct shash_node *node;
742 bool changed = false;
744 SHASH_FOR_EACH (node, json_object(row_json)) {
745 const char *column_name = node->name;
746 const struct ovsdb_idl_column *column;
747 struct ovsdb_datum datum;
748 struct ovsdb_error *error;
750 column = shash_find_data(&table->columns, column_name);
752 VLOG_WARN_RL(&syntax_rl, "unknown column %s updating row "UUID_FMT,
753 column_name, UUID_ARGS(&row->uuid));
757 error = ovsdb_datum_from_json(&datum, &column->type, node->data, NULL);
759 unsigned int column_idx = column - table->class->columns;
760 struct ovsdb_datum *old = &row->old[column_idx];
762 if (!ovsdb_datum_equals(old, &datum, &column->type)) {
763 ovsdb_datum_swap(old, &datum);
764 if (table->modes[column_idx] & OVSDB_IDL_ALERT) {
768 /* Didn't really change but the OVSDB monitor protocol always
769 * includes every value in a row. */
772 ovsdb_datum_destroy(&datum, &column->type);
774 char *s = ovsdb_error_to_string(error);
775 VLOG_WARN_RL(&syntax_rl, "error parsing column %s in row "UUID_FMT
776 " in table %s: %s", column_name,
777 UUID_ARGS(&row->uuid), table->class->name, s);
779 ovsdb_error_destroy(error);
785 /* When a row A refers to row B through a column with a "refTable" constraint,
786 * but row B does not exist, row B is called an "orphan row". Orphan rows
787 * should not persist, because the database enforces referential integrity, but
788 * they can appear transiently as changes from the database are received (the
789 * database doesn't try to topologically sort them and circular references mean
790 * it isn't always possible anyhow).
792 * This function returns true if 'row' is an orphan row, otherwise false.
795 ovsdb_idl_row_is_orphan(const struct ovsdb_idl_row *row)
797 return !row->old && !row->new;
800 /* Returns true if 'row' is conceptually part of the database as modified by
801 * the current transaction (if any), false otherwise.
803 * This function will return true if 'row' is not an orphan (see the comment on
804 * ovsdb_idl_row_is_orphan()) and:
806 * - 'row' exists in the database and has not been deleted within the
807 * current transaction (if any).
809 * - 'row' was inserted within the current transaction and has not been
810 * deleted. (In the latter case you should not have passed 'row' in at
811 * all, because ovsdb_idl_txn_delete() freed it.)
813 * This function will return false if 'row' is an orphan or if 'row' was
814 * deleted within the current transaction.
817 ovsdb_idl_row_exists(const struct ovsdb_idl_row *row)
819 return row->new != NULL;
823 ovsdb_idl_row_parse(struct ovsdb_idl_row *row)
825 const struct ovsdb_idl_table_class *class = row->table->class;
828 for (i = 0; i < class->n_columns; i++) {
829 const struct ovsdb_idl_column *c = &class->columns[i];
830 (c->parse)(row, &row->old[i]);
835 ovsdb_idl_row_unparse(struct ovsdb_idl_row *row)
837 const struct ovsdb_idl_table_class *class = row->table->class;
840 for (i = 0; i < class->n_columns; i++) {
841 const struct ovsdb_idl_column *c = &class->columns[i];
847 ovsdb_idl_row_clear_old(struct ovsdb_idl_row *row)
849 ovs_assert(row->old == row->new);
850 if (!ovsdb_idl_row_is_orphan(row)) {
851 const struct ovsdb_idl_table_class *class = row->table->class;
854 for (i = 0; i < class->n_columns; i++) {
855 ovsdb_datum_destroy(&row->old[i], &class->columns[i].type);
858 row->old = row->new = NULL;
863 ovsdb_idl_row_clear_new(struct ovsdb_idl_row *row)
865 if (row->old != row->new) {
867 const struct ovsdb_idl_table_class *class = row->table->class;
871 BITMAP_FOR_EACH_1 (i, class->n_columns, row->written) {
872 ovsdb_datum_destroy(&row->new[i], &class->columns[i].type);
884 ovsdb_idl_row_clear_arcs(struct ovsdb_idl_row *row, bool destroy_dsts)
886 struct ovsdb_idl_arc *arc, *next;
888 /* Delete all forward arcs. If 'destroy_dsts', destroy any orphaned rows
889 * that this causes to be unreferenced. */
890 LIST_FOR_EACH_SAFE (arc, next, src_node, &row->src_arcs) {
891 list_remove(&arc->dst_node);
893 && ovsdb_idl_row_is_orphan(arc->dst)
894 && list_is_empty(&arc->dst->dst_arcs)) {
895 ovsdb_idl_row_destroy(arc->dst);
899 list_init(&row->src_arcs);
902 /* Force nodes that reference 'row' to reparse. */
904 ovsdb_idl_row_reparse_backrefs(struct ovsdb_idl_row *row)
906 struct ovsdb_idl_arc *arc, *next;
908 /* This is trickier than it looks. ovsdb_idl_row_clear_arcs() will destroy
909 * 'arc', so we need to use the "safe" variant of list traversal. However,
910 * calling an ovsdb_idl_column's 'parse' function will add an arc
911 * equivalent to 'arc' to row->arcs. That could be a problem for
912 * traversal, but it adds it at the beginning of the list to prevent us
913 * from stumbling upon it again.
915 * (If duplicate arcs were possible then we would need to make sure that
916 * 'next' didn't also point into 'arc''s destination, but we forbid
917 * duplicate arcs.) */
918 LIST_FOR_EACH_SAFE (arc, next, dst_node, &row->dst_arcs) {
919 struct ovsdb_idl_row *ref = arc->src;
921 ovsdb_idl_row_unparse(ref);
922 ovsdb_idl_row_clear_arcs(ref, false);
923 ovsdb_idl_row_parse(ref);
927 static struct ovsdb_idl_row *
928 ovsdb_idl_row_create__(const struct ovsdb_idl_table_class *class)
930 struct ovsdb_idl_row *row = xzalloc(class->allocation_size);
931 class->row_init(row);
932 list_init(&row->src_arcs);
933 list_init(&row->dst_arcs);
934 hmap_node_nullify(&row->txn_node);
938 static struct ovsdb_idl_row *
939 ovsdb_idl_row_create(struct ovsdb_idl_table *table, const struct uuid *uuid)
941 struct ovsdb_idl_row *row = ovsdb_idl_row_create__(table->class);
942 hmap_insert(&table->rows, &row->hmap_node, uuid_hash(uuid));
949 ovsdb_idl_row_destroy(struct ovsdb_idl_row *row)
952 ovsdb_idl_row_clear_old(row);
953 hmap_remove(&row->table->rows, &row->hmap_node);
959 ovsdb_idl_insert_row(struct ovsdb_idl_row *row, const struct json *row_json)
961 const struct ovsdb_idl_table_class *class = row->table->class;
964 ovs_assert(!row->old && !row->new);
965 row->old = row->new = xmalloc(class->n_columns * sizeof *row->old);
966 for (i = 0; i < class->n_columns; i++) {
967 ovsdb_datum_init_default(&row->old[i], &class->columns[i].type);
969 ovsdb_idl_row_update(row, row_json);
970 ovsdb_idl_row_parse(row);
972 ovsdb_idl_row_reparse_backrefs(row);
976 ovsdb_idl_delete_row(struct ovsdb_idl_row *row)
978 ovsdb_idl_row_unparse(row);
979 ovsdb_idl_row_clear_arcs(row, true);
980 ovsdb_idl_row_clear_old(row);
981 if (list_is_empty(&row->dst_arcs)) {
982 ovsdb_idl_row_destroy(row);
984 ovsdb_idl_row_reparse_backrefs(row);
988 /* Returns true if a column with mode OVSDB_IDL_MODE_RW changed, false
991 ovsdb_idl_modify_row(struct ovsdb_idl_row *row, const struct json *row_json)
995 ovsdb_idl_row_unparse(row);
996 ovsdb_idl_row_clear_arcs(row, true);
997 changed = ovsdb_idl_row_update(row, row_json);
998 ovsdb_idl_row_parse(row);
1004 may_add_arc(const struct ovsdb_idl_row *src, const struct ovsdb_idl_row *dst)
1006 const struct ovsdb_idl_arc *arc;
1013 /* No duplicate arcs.
1015 * We only need to test whether the first arc in dst->dst_arcs originates
1016 * at 'src', since we add all of the arcs from a given source in a clump
1017 * (in a single call to ovsdb_idl_row_parse()) and new arcs are always
1018 * added at the front of the dst_arcs list. */
1019 if (list_is_empty(&dst->dst_arcs)) {
1022 arc = CONTAINER_OF(dst->dst_arcs.next, struct ovsdb_idl_arc, dst_node);
1023 return arc->src != src;
1026 static struct ovsdb_idl_table *
1027 ovsdb_idl_table_from_class(const struct ovsdb_idl *idl,
1028 const struct ovsdb_idl_table_class *table_class)
1030 return &idl->tables[table_class - idl->class->tables];
1033 /* Called by ovsdb-idlc generated code. */
1034 struct ovsdb_idl_row *
1035 ovsdb_idl_get_row_arc(struct ovsdb_idl_row *src,
1036 struct ovsdb_idl_table_class *dst_table_class,
1037 const struct uuid *dst_uuid)
1039 struct ovsdb_idl *idl = src->table->idl;
1040 struct ovsdb_idl_table *dst_table;
1041 struct ovsdb_idl_arc *arc;
1042 struct ovsdb_idl_row *dst;
1044 dst_table = ovsdb_idl_table_from_class(idl, dst_table_class);
1045 dst = ovsdb_idl_get_row(dst_table, dst_uuid);
1047 /* We're being called from ovsdb_idl_txn_write(). We must not update
1048 * any arcs, because the transaction will be backed out at commit or
1049 * abort time and we don't want our graph screwed up.
1051 * Just return the destination row, if there is one and it has not been
1053 if (dst && (hmap_node_is_null(&dst->txn_node) || dst->new)) {
1058 /* We're being called from some other context. Update the graph. */
1060 dst = ovsdb_idl_row_create(dst_table, dst_uuid);
1063 /* Add a new arc, if it wouldn't be a self-arc or a duplicate arc. */
1064 if (may_add_arc(src, dst)) {
1065 /* The arc *must* be added at the front of the dst_arcs list. See
1066 * ovsdb_idl_row_reparse_backrefs() for details. */
1067 arc = xmalloc(sizeof *arc);
1068 list_push_front(&src->src_arcs, &arc->src_node);
1069 list_push_front(&dst->dst_arcs, &arc->dst_node);
1074 return !ovsdb_idl_row_is_orphan(dst) ? dst : NULL;
1078 /* Searches 'tc''s table in 'idl' for a row with UUID 'uuid'. Returns a
1079 * pointer to the row if there is one, otherwise a null pointer. */
1080 const struct ovsdb_idl_row *
1081 ovsdb_idl_get_row_for_uuid(const struct ovsdb_idl *idl,
1082 const struct ovsdb_idl_table_class *tc,
1083 const struct uuid *uuid)
1085 return ovsdb_idl_get_row(ovsdb_idl_table_from_class(idl, tc), uuid);
1088 static struct ovsdb_idl_row *
1089 next_real_row(struct ovsdb_idl_table *table, struct hmap_node *node)
1091 for (; node; node = hmap_next(&table->rows, node)) {
1092 struct ovsdb_idl_row *row;
1094 row = CONTAINER_OF(node, struct ovsdb_idl_row, hmap_node);
1095 if (ovsdb_idl_row_exists(row)) {
1102 /* Returns a row in 'table_class''s table in 'idl', or a null pointer if that
1105 * Database tables are internally maintained as hash tables, so adding or
1106 * removing rows while traversing the same table can cause some rows to be
1107 * visited twice or not at apply. */
1108 const struct ovsdb_idl_row *
1109 ovsdb_idl_first_row(const struct ovsdb_idl *idl,
1110 const struct ovsdb_idl_table_class *table_class)
1112 struct ovsdb_idl_table *table
1113 = ovsdb_idl_table_from_class(idl, table_class);
1114 return next_real_row(table, hmap_first(&table->rows));
1117 /* Returns a row following 'row' within its table, or a null pointer if 'row'
1118 * is the last row in its table. */
1119 const struct ovsdb_idl_row *
1120 ovsdb_idl_next_row(const struct ovsdb_idl_row *row)
1122 struct ovsdb_idl_table *table = row->table;
1124 return next_real_row(table, hmap_next(&table->rows, &row->hmap_node));
1127 /* Reads and returns the value of 'column' within 'row'. If an ongoing
1128 * transaction has changed 'column''s value, the modified value is returned.
1130 * The caller must not modify or free the returned value.
1132 * Various kinds of changes can invalidate the returned value: writing to the
1133 * same 'column' in 'row' (e.g. with ovsdb_idl_txn_write()), deleting 'row'
1134 * (e.g. with ovsdb_idl_txn_delete()), or completing an ongoing transaction
1135 * (e.g. with ovsdb_idl_txn_commit() or ovsdb_idl_txn_abort()). If the
1136 * returned value is needed for a long time, it is best to make a copy of it
1137 * with ovsdb_datum_clone(). */
1138 const struct ovsdb_datum *
1139 ovsdb_idl_read(const struct ovsdb_idl_row *row,
1140 const struct ovsdb_idl_column *column)
1142 const struct ovsdb_idl_table_class *class;
1145 ovs_assert(!ovsdb_idl_row_is_synthetic(row));
1147 class = row->table->class;
1148 column_idx = column - class->columns;
1150 ovs_assert(row->new != NULL);
1151 ovs_assert(column_idx < class->n_columns);
1153 if (row->written && bitmap_is_set(row->written, column_idx)) {
1154 return &row->new[column_idx];
1155 } else if (row->old) {
1156 return &row->old[column_idx];
1158 return ovsdb_datum_default(&column->type);
1162 /* Same as ovsdb_idl_read(), except that it also asserts that 'column' has key
1163 * type 'key_type' and value type 'value_type'. (Scalar and set types will
1164 * have a value type of OVSDB_TYPE_VOID.)
1166 * This is useful in code that "knows" that a particular column has a given
1167 * type, so that it will abort if someone changes the column's type without
1168 * updating the code that uses it. */
1169 const struct ovsdb_datum *
1170 ovsdb_idl_get(const struct ovsdb_idl_row *row,
1171 const struct ovsdb_idl_column *column,
1172 enum ovsdb_atomic_type key_type OVS_UNUSED,
1173 enum ovsdb_atomic_type value_type OVS_UNUSED)
1175 ovs_assert(column->type.key.type == key_type);
1176 ovs_assert(column->type.value.type == value_type);
1178 return ovsdb_idl_read(row, column);
1181 /* Returns false if 'row' was obtained from the IDL, true if it was initialized
1182 * to all-zero-bits by some other entity. If 'row' was set up some other way
1183 * then the return value is indeterminate. */
1185 ovsdb_idl_row_is_synthetic(const struct ovsdb_idl_row *row)
1187 return row->table == NULL;
1192 static void ovsdb_idl_txn_complete(struct ovsdb_idl_txn *txn,
1193 enum ovsdb_idl_txn_status);
1195 /* Returns a string representation of 'status'. The caller must not modify or
1196 * free the returned string.
1198 * The return value is probably useful only for debug log messages and unit
1201 ovsdb_idl_txn_status_to_string(enum ovsdb_idl_txn_status status)
1204 case TXN_UNCOMMITTED:
1205 return "uncommitted";
1208 case TXN_INCOMPLETE:
1209 return "incomplete";
1216 case TXN_NOT_LOCKED:
1217 return "not locked";
1224 /* Starts a new transaction on 'idl'. A given ovsdb_idl may only have a single
1225 * active transaction at a time. See the large comment in ovsdb-idl.h for
1226 * general information on transactions. */
1227 struct ovsdb_idl_txn *
1228 ovsdb_idl_txn_create(struct ovsdb_idl *idl)
1230 struct ovsdb_idl_txn *txn;
1232 ovs_assert(!idl->txn);
1233 idl->txn = txn = xmalloc(sizeof *txn);
1234 txn->request_id = NULL;
1236 hmap_init(&txn->txn_rows);
1237 txn->status = TXN_UNCOMMITTED;
1239 txn->dry_run = false;
1240 ds_init(&txn->comment);
1242 txn->inc_table = NULL;
1243 txn->inc_column = NULL;
1245 hmap_init(&txn->inserted_rows);
1250 /* Appends 's', which is treated as a printf()-type format string, to the
1251 * comments that will be passed to the OVSDB server when 'txn' is committed.
1252 * (The comment will be committed to the OVSDB log, which "ovsdb-tool
1253 * show-log" can print in a relatively human-readable form.) */
1255 ovsdb_idl_txn_add_comment(struct ovsdb_idl_txn *txn, const char *s, ...)
1259 if (txn->comment.length) {
1260 ds_put_char(&txn->comment, '\n');
1264 ds_put_format_valist(&txn->comment, s, args);
1268 /* Marks 'txn' as a transaction that will not actually modify the database. In
1269 * almost every way, the transaction is treated like other transactions. It
1270 * must be committed or aborted like other transactions, it will be sent to the
1271 * database server like other transactions, and so on. The only difference is
1272 * that the operations sent to the database server will include, as the last
1273 * step, an "abort" operation, so that any changes made by the transaction will
1274 * not actually take effect. */
1276 ovsdb_idl_txn_set_dry_run(struct ovsdb_idl_txn *txn)
1278 txn->dry_run = true;
1281 /* Causes 'txn', when committed, to increment the value of 'column' within
1282 * 'row' by 1. 'column' must have an integer type. After 'txn' commits
1283 * successfully, the client may retrieve the final (incremented) value of
1284 * 'column' with ovsdb_idl_txn_get_increment_new_value().
1286 * The client could accomplish something similar with ovsdb_idl_read(),
1287 * ovsdb_idl_txn_verify() and ovsdb_idl_txn_write(), or with ovsdb-idlc
1288 * generated wrappers for these functions. However, ovsdb_idl_txn_increment()
1289 * will never (by itself) fail because of a verify error.
1291 * The intended use is for incrementing the "next_cfg" column in the
1292 * Open_vSwitch table. */
1294 ovsdb_idl_txn_increment(struct ovsdb_idl_txn *txn,
1295 const struct ovsdb_idl_row *row,
1296 const struct ovsdb_idl_column *column)
1298 ovs_assert(!txn->inc_table);
1299 ovs_assert(column->type.key.type == OVSDB_TYPE_INTEGER);
1300 ovs_assert(column->type.value.type == OVSDB_TYPE_VOID);
1302 txn->inc_table = row->table->class->name;
1303 txn->inc_column = column->name;
1304 txn->inc_row = row->uuid;
1307 /* Destroys 'txn' and frees all associated memory. If ovsdb_idl_txn_commit()
1308 * has been called for 'txn' but the commit is still incomplete (that is, the
1309 * last call returned TXN_INCOMPLETE) then the transaction may or may not still
1310 * end up committing at the database server, but the client will not be able to
1311 * get any further status information back. */
1313 ovsdb_idl_txn_destroy(struct ovsdb_idl_txn *txn)
1315 struct ovsdb_idl_txn_insert *insert, *next;
1317 json_destroy(txn->request_id);
1318 if (txn->status == TXN_INCOMPLETE) {
1319 hmap_remove(&txn->idl->outstanding_txns, &txn->hmap_node);
1321 ovsdb_idl_txn_abort(txn);
1322 ds_destroy(&txn->comment);
1324 HMAP_FOR_EACH_SAFE (insert, next, hmap_node, &txn->inserted_rows) {
1327 hmap_destroy(&txn->inserted_rows);
1331 /* Causes poll_block() to wake up if 'txn' has completed committing. */
1333 ovsdb_idl_txn_wait(const struct ovsdb_idl_txn *txn)
1335 if (txn->status != TXN_UNCOMMITTED && txn->status != TXN_INCOMPLETE) {
1336 poll_immediate_wake();
1340 static struct json *
1341 where_uuid_equals(const struct uuid *uuid)
1344 json_array_create_1(
1345 json_array_create_3(
1346 json_string_create("_uuid"),
1347 json_string_create("=="),
1348 json_array_create_2(
1349 json_string_create("uuid"),
1350 json_string_create_nocopy(
1351 xasprintf(UUID_FMT, UUID_ARGS(uuid))))));
1355 uuid_name_from_uuid(const struct uuid *uuid)
1360 name = xasprintf("row"UUID_FMT, UUID_ARGS(uuid));
1361 for (p = name; *p != '\0'; p++) {
1370 static const struct ovsdb_idl_row *
1371 ovsdb_idl_txn_get_row(const struct ovsdb_idl_txn *txn, const struct uuid *uuid)
1373 const struct ovsdb_idl_row *row;
1375 HMAP_FOR_EACH_WITH_HASH (row, txn_node, uuid_hash(uuid), &txn->txn_rows) {
1376 if (uuid_equals(&row->uuid, uuid)) {
1383 /* XXX there must be a cleaner way to do this */
1384 static struct json *
1385 substitute_uuids(struct json *json, const struct ovsdb_idl_txn *txn)
1387 if (json->type == JSON_ARRAY) {
1391 if (json->u.array.n == 2
1392 && json->u.array.elems[0]->type == JSON_STRING
1393 && json->u.array.elems[1]->type == JSON_STRING
1394 && !strcmp(json->u.array.elems[0]->u.string, "uuid")
1395 && uuid_from_string(&uuid, json->u.array.elems[1]->u.string)) {
1396 const struct ovsdb_idl_row *row;
1398 row = ovsdb_idl_txn_get_row(txn, &uuid);
1399 if (row && !row->old && row->new) {
1402 return json_array_create_2(
1403 json_string_create("named-uuid"),
1404 json_string_create_nocopy(uuid_name_from_uuid(&uuid)));
1408 for (i = 0; i < json->u.array.n; i++) {
1409 json->u.array.elems[i] = substitute_uuids(json->u.array.elems[i],
1412 } else if (json->type == JSON_OBJECT) {
1413 struct shash_node *node;
1415 SHASH_FOR_EACH (node, json_object(json)) {
1416 node->data = substitute_uuids(node->data, txn);
1423 ovsdb_idl_txn_disassemble(struct ovsdb_idl_txn *txn)
1425 struct ovsdb_idl_row *row, *next;
1427 /* This must happen early. Otherwise, ovsdb_idl_row_parse() will call an
1428 * ovsdb_idl_column's 'parse' function, which will call
1429 * ovsdb_idl_get_row_arc(), which will seen that the IDL is in a
1430 * transaction and fail to update the graph. */
1431 txn->idl->txn = NULL;
1433 HMAP_FOR_EACH_SAFE (row, next, txn_node, &txn->txn_rows) {
1436 ovsdb_idl_row_unparse(row);
1437 ovsdb_idl_row_clear_arcs(row, false);
1438 ovsdb_idl_row_parse(row);
1441 ovsdb_idl_row_unparse(row);
1443 ovsdb_idl_row_clear_new(row);
1446 row->prereqs = NULL;
1449 row->written = NULL;
1451 hmap_remove(&txn->txn_rows, &row->txn_node);
1452 hmap_node_nullify(&row->txn_node);
1454 hmap_remove(&row->table->rows, &row->hmap_node);
1458 hmap_destroy(&txn->txn_rows);
1459 hmap_init(&txn->txn_rows);
1462 /* Attempts to commit 'txn'. Returns the status of the commit operation, one
1463 * of the following TXN_* constants:
1467 * The transaction is in progress, but not yet complete. The caller
1468 * should call again later, after calling ovsdb_idl_run() to let the IDL
1469 * do OVSDB protocol processing.
1473 * The transaction is complete. (It didn't actually change the database,
1474 * so the IDL didn't send any request to the database server.)
1478 * The caller previously called ovsdb_idl_txn_abort().
1482 * The transaction was successful. The update made by the transaction
1483 * (and possibly other changes made by other database clients) should
1484 * already be visible in the IDL.
1488 * The transaction failed for some transient reason, e.g. because a
1489 * "verify" operation reported an inconsistency or due to a network
1490 * problem. The caller should wait for a change to the database, then
1491 * compose a new transaction, and commit the new transaction.
1493 * Use the return value of ovsdb_idl_get_seqno() to wait for a change in
1494 * the database. It is important to use its return value *before* the
1495 * initial call to ovsdb_idl_txn_commit() as the baseline for this
1496 * purpose, because the change that one should wait for can happen after
1497 * the initial call but before the call that returns TXN_TRY_AGAIN, and
1498 * using some other baseline value in that situation could cause an
1499 * indefinite wait if the database rarely changes.
1503 * The transaction failed because the IDL has been configured to require
1504 * a database lock (with ovsdb_idl_set_lock()) but didn't get it yet or
1505 * has already lost it.
1507 * Committing a transaction rolls back all of the changes that it made to the
1508 * IDL's copy of the database. If the transaction commits successfully, then
1509 * the database server will send an update and, thus, the IDL will be updated
1510 * with the committed changes. */
1511 enum ovsdb_idl_txn_status
1512 ovsdb_idl_txn_commit(struct ovsdb_idl_txn *txn)
1514 struct ovsdb_idl_row *row;
1515 struct json *operations;
1518 if (txn != txn->idl->txn) {
1522 /* If we need a lock but don't have it, give up quickly. */
1523 if (txn->idl->lock_name && !ovsdb_idl_has_lock(txn->idl)) {
1524 txn->status = TXN_NOT_LOCKED;
1525 ovsdb_idl_txn_disassemble(txn);
1529 operations = json_array_create_1(
1530 json_string_create(txn->idl->class->database));
1532 /* Assert that we have the required lock (avoiding a race). */
1533 if (txn->idl->lock_name) {
1534 struct json *op = json_object_create();
1535 json_array_add(operations, op);
1536 json_object_put_string(op, "op", "assert");
1537 json_object_put_string(op, "lock", txn->idl->lock_name);
1540 /* Add prerequisites and declarations of new rows. */
1541 HMAP_FOR_EACH (row, txn_node, &txn->txn_rows) {
1542 /* XXX check that deleted rows exist even if no prereqs? */
1544 const struct ovsdb_idl_table_class *class = row->table->class;
1545 size_t n_columns = class->n_columns;
1546 struct json *op, *columns, *row_json;
1549 op = json_object_create();
1550 json_array_add(operations, op);
1551 json_object_put_string(op, "op", "wait");
1552 json_object_put_string(op, "table", class->name);
1553 json_object_put(op, "timeout", json_integer_create(0));
1554 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1555 json_object_put_string(op, "until", "==");
1556 columns = json_array_create_empty();
1557 json_object_put(op, "columns", columns);
1558 row_json = json_object_create();
1559 json_object_put(op, "rows", json_array_create_1(row_json));
1561 BITMAP_FOR_EACH_1 (idx, n_columns, row->prereqs) {
1562 const struct ovsdb_idl_column *column = &class->columns[idx];
1563 json_array_add(columns, json_string_create(column->name));
1564 json_object_put(row_json, column->name,
1565 ovsdb_datum_to_json(&row->old[idx],
1572 any_updates = false;
1573 HMAP_FOR_EACH (row, txn_node, &txn->txn_rows) {
1574 const struct ovsdb_idl_table_class *class = row->table->class;
1577 if (class->is_root) {
1578 struct json *op = json_object_create();
1579 json_object_put_string(op, "op", "delete");
1580 json_object_put_string(op, "table", class->name);
1581 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1582 json_array_add(operations, op);
1585 /* Let ovsdb-server decide whether to really delete it. */
1587 } else if (row->old != row->new) {
1588 struct json *row_json;
1592 op = json_object_create();
1593 json_object_put_string(op, "op", row->old ? "update" : "insert");
1594 json_object_put_string(op, "table", class->name);
1596 json_object_put(op, "where", where_uuid_equals(&row->uuid));
1598 struct ovsdb_idl_txn_insert *insert;
1602 json_object_put(op, "uuid-name",
1603 json_string_create_nocopy(
1604 uuid_name_from_uuid(&row->uuid)));
1606 insert = xmalloc(sizeof *insert);
1607 insert->dummy = row->uuid;
1608 insert->op_index = operations->u.array.n - 1;
1609 uuid_zero(&insert->real);
1610 hmap_insert(&txn->inserted_rows, &insert->hmap_node,
1611 uuid_hash(&insert->dummy));
1613 row_json = json_object_create();
1614 json_object_put(op, "row", row_json);
1617 BITMAP_FOR_EACH_1 (idx, class->n_columns, row->written) {
1618 const struct ovsdb_idl_column *column =
1619 &class->columns[idx];
1622 || !ovsdb_datum_is_default(&row->new[idx],
1624 json_object_put(row_json, column->name,
1626 ovsdb_datum_to_json(&row->new[idx],
1630 /* If anything really changed, consider it an update.
1631 * We can't suppress not-really-changed values earlier
1632 * or transactions would become nonatomic (see the big
1633 * comment inside ovsdb_idl_txn_write()). */
1634 if (!any_updates && row->old &&
1635 !ovsdb_datum_equals(&row->old[idx], &row->new[idx],
1643 if (!row->old || !shash_is_empty(json_object(row_json))) {
1644 json_array_add(operations, op);
1651 /* Add increment. */
1652 if (txn->inc_table && any_updates) {
1655 txn->inc_index = operations->u.array.n - 1;
1657 op = json_object_create();
1658 json_object_put_string(op, "op", "mutate");
1659 json_object_put_string(op, "table", txn->inc_table);
1660 json_object_put(op, "where",
1661 substitute_uuids(where_uuid_equals(&txn->inc_row),
1663 json_object_put(op, "mutations",
1664 json_array_create_1(
1665 json_array_create_3(
1666 json_string_create(txn->inc_column),
1667 json_string_create("+="),
1668 json_integer_create(1))));
1669 json_array_add(operations, op);
1671 op = json_object_create();
1672 json_object_put_string(op, "op", "select");
1673 json_object_put_string(op, "table", txn->inc_table);
1674 json_object_put(op, "where",
1675 substitute_uuids(where_uuid_equals(&txn->inc_row),
1677 json_object_put(op, "columns",
1678 json_array_create_1(json_string_create(
1680 json_array_add(operations, op);
1683 if (txn->comment.length) {
1684 struct json *op = json_object_create();
1685 json_object_put_string(op, "op", "comment");
1686 json_object_put_string(op, "comment", ds_cstr(&txn->comment));
1687 json_array_add(operations, op);
1691 struct json *op = json_object_create();
1692 json_object_put_string(op, "op", "abort");
1693 json_array_add(operations, op);
1697 txn->status = TXN_UNCHANGED;
1698 json_destroy(operations);
1699 } else if (!jsonrpc_session_send(
1701 jsonrpc_create_request(
1702 "transact", operations, &txn->request_id))) {
1703 hmap_insert(&txn->idl->outstanding_txns, &txn->hmap_node,
1704 json_hash(txn->request_id, 0));
1705 txn->status = TXN_INCOMPLETE;
1707 txn->status = TXN_TRY_AGAIN;
1710 ovsdb_idl_txn_disassemble(txn);
1714 /* Attempts to commit 'txn', blocking until the commit either succeeds or
1715 * fails. Returns the final commit status, which may be any TXN_* value other
1716 * than TXN_INCOMPLETE.
1718 * This function calls ovsdb_idl_run() on 'txn''s IDL, so it may cause the
1719 * return value of ovsdb_idl_get_seqno() to change. */
1720 enum ovsdb_idl_txn_status
1721 ovsdb_idl_txn_commit_block(struct ovsdb_idl_txn *txn)
1723 enum ovsdb_idl_txn_status status;
1726 while ((status = ovsdb_idl_txn_commit(txn)) == TXN_INCOMPLETE) {
1727 ovsdb_idl_run(txn->idl);
1728 ovsdb_idl_wait(txn->idl);
1729 ovsdb_idl_txn_wait(txn);
1735 /* Returns the final (incremented) value of the column in 'txn' that was set to
1736 * be incremented by ovsdb_idl_txn_increment(). 'txn' must have committed
1739 ovsdb_idl_txn_get_increment_new_value(const struct ovsdb_idl_txn *txn)
1741 ovs_assert(txn->status == TXN_SUCCESS);
1742 return txn->inc_new_value;
1745 /* Aborts 'txn' without sending it to the database server. This is effective
1746 * only if ovsdb_idl_txn_commit() has not yet been called for 'txn'.
1747 * Otherwise, it has no effect.
1749 * Aborting a transaction doesn't free its memory. Use
1750 * ovsdb_idl_txn_destroy() to do that. */
1752 ovsdb_idl_txn_abort(struct ovsdb_idl_txn *txn)
1754 ovsdb_idl_txn_disassemble(txn);
1755 if (txn->status == TXN_UNCOMMITTED || txn->status == TXN_INCOMPLETE) {
1756 txn->status = TXN_ABORTED;
1760 /* Returns a string that reports the error status for 'txn'. The caller must
1761 * not modify or free the returned string. A call to ovsdb_idl_txn_destroy()
1762 * for 'txn' may free the returned string.
1764 * The return value is ordinarily one of the strings that
1765 * ovsdb_idl_txn_status_to_string() would return, but if the transaction failed
1766 * due to an error reported by the database server, the return value is that
1769 ovsdb_idl_txn_get_error(const struct ovsdb_idl_txn *txn)
1771 if (txn->status != TXN_ERROR) {
1772 return ovsdb_idl_txn_status_to_string(txn->status);
1773 } else if (txn->error) {
1776 return "no error details available";
1781 ovsdb_idl_txn_set_error_json(struct ovsdb_idl_txn *txn,
1782 const struct json *json)
1784 if (txn->error == NULL) {
1785 txn->error = json_to_string(json, JSSF_SORT);
1789 /* For transaction 'txn' that completed successfully, finds and returns the
1790 * permanent UUID that the database assigned to a newly inserted row, given the
1791 * 'uuid' that ovsdb_idl_txn_insert() assigned locally to that row.
1793 * Returns NULL if 'uuid' is not a UUID assigned by ovsdb_idl_txn_insert() or
1794 * if it was assigned by that function and then deleted by
1795 * ovsdb_idl_txn_delete() within the same transaction. (Rows that are inserted
1796 * and then deleted within a single transaction are never sent to the database
1797 * server, so it never assigns them a permanent UUID.) */
1799 ovsdb_idl_txn_get_insert_uuid(const struct ovsdb_idl_txn *txn,
1800 const struct uuid *uuid)
1802 const struct ovsdb_idl_txn_insert *insert;
1804 ovs_assert(txn->status == TXN_SUCCESS || txn->status == TXN_UNCHANGED);
1805 HMAP_FOR_EACH_IN_BUCKET (insert, hmap_node,
1806 uuid_hash(uuid), &txn->inserted_rows) {
1807 if (uuid_equals(uuid, &insert->dummy)) {
1808 return &insert->real;
1815 ovsdb_idl_txn_complete(struct ovsdb_idl_txn *txn,
1816 enum ovsdb_idl_txn_status status)
1818 txn->status = status;
1819 hmap_remove(&txn->idl->outstanding_txns, &txn->hmap_node);
1822 /* Writes 'datum' to the specified 'column' in 'row_'. Updates both 'row_'
1823 * itself and the structs derived from it (e.g. the "struct ovsrec_*", for
1826 * 'datum' must have the correct type for its column. The IDL does not check
1827 * that it meets schema constraints, but ovsdb-server will do so at commit time
1828 * so it had better be correct.
1830 * A transaction must be in progress. Replication of 'column' must not have
1831 * been disabled (by calling ovsdb_idl_omit()).
1833 * Usually this function is used indirectly through one of the "set" functions
1834 * generated by ovsdb-idlc.
1836 * Takes ownership of what 'datum' points to (and in some cases destroys that
1837 * data before returning) but makes a copy of 'datum' itself. (Commonly
1838 * 'datum' is on the caller's stack.) */
1840 ovsdb_idl_txn_write__(const struct ovsdb_idl_row *row_,
1841 const struct ovsdb_idl_column *column,
1842 struct ovsdb_datum *datum, bool owns_datum)
1844 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
1845 const struct ovsdb_idl_table_class *class;
1849 if (ovsdb_idl_row_is_synthetic(row)) {
1853 class = row->table->class;
1854 column_idx = column - class->columns;
1855 write_only = row->table->modes[column_idx] == OVSDB_IDL_MONITOR;
1857 ovs_assert(row->new != NULL);
1858 ovs_assert(column_idx < class->n_columns);
1859 ovs_assert(row->old == NULL ||
1860 row->table->modes[column_idx] & OVSDB_IDL_MONITOR);
1862 if (row->table->idl->verify_write_only && !write_only) {
1863 VLOG_ERR("Bug: Attempt to write to a read/write column (%s:%s) when"
1864 " explicitly configured not to.", class->name, column->name);
1868 /* If this is a write-only column and the datum being written is the same
1869 * as the one already there, just skip the update entirely. This is worth
1870 * optimizing because we have a lot of columns that get periodically
1871 * refreshed into the database but don't actually change that often.
1873 * We don't do this for read/write columns because that would break
1874 * atomicity of transactions--some other client might have written a
1875 * different value in that column since we read it. (But if a whole
1876 * transaction only does writes of existing values, without making any real
1877 * changes, we will drop the whole transaction later in
1878 * ovsdb_idl_txn_commit().) */
1879 if (write_only && ovsdb_datum_equals(ovsdb_idl_read(row, column),
1880 datum, &column->type)) {
1884 if (hmap_node_is_null(&row->txn_node)) {
1885 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
1886 uuid_hash(&row->uuid));
1888 if (row->old == row->new) {
1889 row->new = xmalloc(class->n_columns * sizeof *row->new);
1891 if (!row->written) {
1892 row->written = bitmap_allocate(class->n_columns);
1894 if (bitmap_is_set(row->written, column_idx)) {
1895 ovsdb_datum_destroy(&row->new[column_idx], &column->type);
1897 bitmap_set1(row->written, column_idx);
1900 row->new[column_idx] = *datum;
1902 ovsdb_datum_clone(&row->new[column_idx], datum, &column->type);
1904 (column->unparse)(row);
1905 (column->parse)(row, &row->new[column_idx]);
1910 ovsdb_datum_destroy(datum, &column->type);
1915 ovsdb_idl_txn_write(const struct ovsdb_idl_row *row,
1916 const struct ovsdb_idl_column *column,
1917 struct ovsdb_datum *datum)
1919 ovsdb_idl_txn_write__(row, column, datum, true);
1923 ovsdb_idl_txn_write_clone(const struct ovsdb_idl_row *row,
1924 const struct ovsdb_idl_column *column,
1925 const struct ovsdb_datum *datum)
1927 ovsdb_idl_txn_write__(row, column,
1928 CONST_CAST(struct ovsdb_datum *, datum), false);
1931 /* Causes the original contents of 'column' in 'row_' to be verified as a
1932 * prerequisite to completing the transaction. That is, if 'column' in 'row_'
1933 * changed (or if 'row_' was deleted) between the time that the IDL originally
1934 * read its contents and the time that the transaction commits, then the
1935 * transaction aborts and ovsdb_idl_txn_commit() returns TXN_AGAIN_WAIT or
1936 * TXN_AGAIN_NOW (depending on whether the database change has already been
1939 * The intention is that, to ensure that no transaction commits based on dirty
1940 * reads, an application should call ovsdb_idl_txn_verify() on each data item
1941 * read as part of a read-modify-write operation.
1943 * In some cases ovsdb_idl_txn_verify() reduces to a no-op, because the current
1944 * value of 'column' is already known:
1946 * - If 'row_' is a row created by the current transaction (returned by
1947 * ovsdb_idl_txn_insert()).
1949 * - If 'column' has already been modified (with ovsdb_idl_txn_write())
1950 * within the current transaction.
1952 * Because of the latter property, always call ovsdb_idl_txn_verify() *before*
1953 * ovsdb_idl_txn_write() for a given read-modify-write.
1955 * A transaction must be in progress.
1957 * Usually this function is used indirectly through one of the "verify"
1958 * functions generated by ovsdb-idlc. */
1960 ovsdb_idl_txn_verify(const struct ovsdb_idl_row *row_,
1961 const struct ovsdb_idl_column *column)
1963 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
1964 const struct ovsdb_idl_table_class *class;
1967 if (ovsdb_idl_row_is_synthetic(row)) {
1971 class = row->table->class;
1972 column_idx = column - class->columns;
1974 ovs_assert(row->new != NULL);
1975 ovs_assert(row->old == NULL ||
1976 row->table->modes[column_idx] & OVSDB_IDL_MONITOR);
1978 || (row->written && bitmap_is_set(row->written, column_idx))) {
1982 if (hmap_node_is_null(&row->txn_node)) {
1983 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
1984 uuid_hash(&row->uuid));
1986 if (!row->prereqs) {
1987 row->prereqs = bitmap_allocate(class->n_columns);
1989 bitmap_set1(row->prereqs, column_idx);
1992 /* Deletes 'row_' from its table. May free 'row_', so it must not be
1993 * accessed afterward.
1995 * A transaction must be in progress.
1997 * Usually this function is used indirectly through one of the "delete"
1998 * functions generated by ovsdb-idlc. */
2000 ovsdb_idl_txn_delete(const struct ovsdb_idl_row *row_)
2002 struct ovsdb_idl_row *row = CONST_CAST(struct ovsdb_idl_row *, row_);
2004 if (ovsdb_idl_row_is_synthetic(row)) {
2008 ovs_assert(row->new != NULL);
2010 ovsdb_idl_row_unparse(row);
2011 ovsdb_idl_row_clear_new(row);
2012 ovs_assert(!row->prereqs);
2013 hmap_remove(&row->table->rows, &row->hmap_node);
2014 hmap_remove(&row->table->idl->txn->txn_rows, &row->txn_node);
2018 if (hmap_node_is_null(&row->txn_node)) {
2019 hmap_insert(&row->table->idl->txn->txn_rows, &row->txn_node,
2020 uuid_hash(&row->uuid));
2022 ovsdb_idl_row_clear_new(row);
2026 /* Inserts and returns a new row in the table with the specified 'class' in the
2027 * database with open transaction 'txn'.
2029 * The new row is assigned a provisional UUID. If 'uuid' is null then one is
2030 * randomly generated; otherwise 'uuid' should specify a randomly generated
2031 * UUID not otherwise in use. ovsdb-server will assign a different UUID when
2032 * 'txn' is committed, but the IDL will replace any uses of the provisional
2033 * UUID in the data to be to be committed by the UUID assigned by
2036 * Usually this function is used indirectly through one of the "insert"
2037 * functions generated by ovsdb-idlc. */
2038 const struct ovsdb_idl_row *
2039 ovsdb_idl_txn_insert(struct ovsdb_idl_txn *txn,
2040 const struct ovsdb_idl_table_class *class,
2041 const struct uuid *uuid)
2043 struct ovsdb_idl_row *row = ovsdb_idl_row_create__(class);
2046 ovs_assert(!ovsdb_idl_txn_get_row(txn, uuid));
2049 uuid_generate(&row->uuid);
2052 row->table = ovsdb_idl_table_from_class(txn->idl, class);
2053 row->new = xmalloc(class->n_columns * sizeof *row->new);
2054 hmap_insert(&row->table->rows, &row->hmap_node, uuid_hash(&row->uuid));
2055 hmap_insert(&txn->txn_rows, &row->txn_node, uuid_hash(&row->uuid));
2060 ovsdb_idl_txn_abort_all(struct ovsdb_idl *idl)
2062 struct ovsdb_idl_txn *txn;
2064 HMAP_FOR_EACH (txn, hmap_node, &idl->outstanding_txns) {
2065 ovsdb_idl_txn_complete(txn, TXN_TRY_AGAIN);
2069 static struct ovsdb_idl_txn *
2070 ovsdb_idl_txn_find(struct ovsdb_idl *idl, const struct json *id)
2072 struct ovsdb_idl_txn *txn;
2074 HMAP_FOR_EACH_WITH_HASH (txn, hmap_node,
2075 json_hash(id, 0), &idl->outstanding_txns) {
2076 if (json_equal(id, txn->request_id)) {
2084 check_json_type(const struct json *json, enum json_type type, const char *name)
2087 VLOG_WARN_RL(&syntax_rl, "%s is missing", name);
2089 } else if (json->type != type) {
2090 VLOG_WARN_RL(&syntax_rl, "%s is %s instead of %s",
2091 name, json_type_to_string(json->type),
2092 json_type_to_string(type));
2100 ovsdb_idl_txn_process_inc_reply(struct ovsdb_idl_txn *txn,
2101 const struct json_array *results)
2103 struct json *count, *rows, *row, *column;
2104 struct shash *mutate, *select;
2106 if (txn->inc_index + 2 > results->n) {
2107 VLOG_WARN_RL(&syntax_rl, "reply does not contain enough operations "
2108 "for increment (has %"PRIuSIZE", needs %u)",
2109 results->n, txn->inc_index + 2);
2113 /* We know that this is a JSON object because the loop in
2114 * ovsdb_idl_txn_process_reply() checked. */
2115 mutate = json_object(results->elems[txn->inc_index]);
2116 count = shash_find_data(mutate, "count");
2117 if (!check_json_type(count, JSON_INTEGER, "\"mutate\" reply \"count\"")) {
2120 if (count->u.integer != 1) {
2121 VLOG_WARN_RL(&syntax_rl,
2122 "\"mutate\" reply \"count\" is %lld instead of 1",
2127 select = json_object(results->elems[txn->inc_index + 1]);
2128 rows = shash_find_data(select, "rows");
2129 if (!check_json_type(rows, JSON_ARRAY, "\"select\" reply \"rows\"")) {
2132 if (rows->u.array.n != 1) {
2133 VLOG_WARN_RL(&syntax_rl, "\"select\" reply \"rows\" has %"PRIuSIZE" elements "
2138 row = rows->u.array.elems[0];
2139 if (!check_json_type(row, JSON_OBJECT, "\"select\" reply row")) {
2142 column = shash_find_data(json_object(row), txn->inc_column);
2143 if (!check_json_type(column, JSON_INTEGER,
2144 "\"select\" reply inc column")) {
2147 txn->inc_new_value = column->u.integer;
2152 ovsdb_idl_txn_process_insert_reply(struct ovsdb_idl_txn_insert *insert,
2153 const struct json_array *results)
2155 static const struct ovsdb_base_type uuid_type = OVSDB_BASE_UUID_INIT;
2156 struct ovsdb_error *error;
2157 struct json *json_uuid;
2158 union ovsdb_atom uuid;
2159 struct shash *reply;
2161 if (insert->op_index >= results->n) {
2162 VLOG_WARN_RL(&syntax_rl, "reply does not contain enough operations "
2163 "for insert (has %"PRIuSIZE", needs %u)",
2164 results->n, insert->op_index);
2168 /* We know that this is a JSON object because the loop in
2169 * ovsdb_idl_txn_process_reply() checked. */
2170 reply = json_object(results->elems[insert->op_index]);
2171 json_uuid = shash_find_data(reply, "uuid");
2172 if (!check_json_type(json_uuid, JSON_ARRAY, "\"insert\" reply \"uuid\"")) {
2176 error = ovsdb_atom_from_json(&uuid, &uuid_type, json_uuid, NULL);
2178 char *s = ovsdb_error_to_string(error);
2179 VLOG_WARN_RL(&syntax_rl, "\"insert\" reply \"uuid\" is not a JSON "
2182 ovsdb_error_destroy(error);
2186 insert->real = uuid.uuid;
2192 ovsdb_idl_txn_process_reply(struct ovsdb_idl *idl,
2193 const struct jsonrpc_msg *msg)
2195 struct ovsdb_idl_txn *txn;
2196 enum ovsdb_idl_txn_status status;
2198 txn = ovsdb_idl_txn_find(idl, msg->id);
2203 if (msg->type == JSONRPC_ERROR) {
2205 } else if (msg->result->type != JSON_ARRAY) {
2206 VLOG_WARN_RL(&syntax_rl, "reply to \"transact\" is not JSON array");
2209 struct json_array *ops = &msg->result->u.array;
2210 int hard_errors = 0;
2211 int soft_errors = 0;
2212 int lock_errors = 0;
2215 for (i = 0; i < ops->n; i++) {
2216 struct json *op = ops->elems[i];
2218 if (op->type == JSON_NULL) {
2219 /* This isn't an error in itself but indicates that some prior
2220 * operation failed, so make sure that we know about it. */
2222 } else if (op->type == JSON_OBJECT) {
2225 error = shash_find_data(json_object(op), "error");
2227 if (error->type == JSON_STRING) {
2228 if (!strcmp(error->u.string, "timed out")) {
2230 } else if (!strcmp(error->u.string, "not owner")) {
2232 } else if (strcmp(error->u.string, "aborted")) {
2234 ovsdb_idl_txn_set_error_json(txn, op);
2238 ovsdb_idl_txn_set_error_json(txn, op);
2239 VLOG_WARN_RL(&syntax_rl,
2240 "\"error\" in reply is not JSON string");
2245 ovsdb_idl_txn_set_error_json(txn, op);
2246 VLOG_WARN_RL(&syntax_rl,
2247 "operation reply is not JSON null or object");
2251 if (!soft_errors && !hard_errors && !lock_errors) {
2252 struct ovsdb_idl_txn_insert *insert;
2254 if (txn->inc_table && !ovsdb_idl_txn_process_inc_reply(txn, ops)) {
2258 HMAP_FOR_EACH (insert, hmap_node, &txn->inserted_rows) {
2259 if (!ovsdb_idl_txn_process_insert_reply(insert, ops)) {
2265 status = (hard_errors ? TXN_ERROR
2266 : lock_errors ? TXN_NOT_LOCKED
2267 : soft_errors ? TXN_TRY_AGAIN
2271 ovsdb_idl_txn_complete(txn, status);
2275 /* Returns the transaction currently active for 'row''s IDL. A transaction
2276 * must currently be active. */
2277 struct ovsdb_idl_txn *
2278 ovsdb_idl_txn_get(const struct ovsdb_idl_row *row)
2280 struct ovsdb_idl_txn *txn = row->table->idl->txn;
2281 ovs_assert(txn != NULL);
2285 /* Returns the IDL on which 'txn' acts. */
2287 ovsdb_idl_txn_get_idl (struct ovsdb_idl_txn *txn)
2292 /* If 'lock_name' is nonnull, configures 'idl' to obtain the named lock from
2293 * the database server and to avoid modifying the database when the lock cannot
2294 * be acquired (that is, when another client has the same lock).
2296 * If 'lock_name' is NULL, drops the locking requirement and releases the
2299 ovsdb_idl_set_lock(struct ovsdb_idl *idl, const char *lock_name)
2301 ovs_assert(!idl->txn);
2302 ovs_assert(hmap_is_empty(&idl->outstanding_txns));
2304 if (idl->lock_name && (!lock_name || strcmp(lock_name, idl->lock_name))) {
2305 /* Release previous lock. */
2306 ovsdb_idl_send_unlock_request(idl);
2307 free(idl->lock_name);
2308 idl->lock_name = NULL;
2309 idl->is_lock_contended = false;
2312 if (lock_name && !idl->lock_name) {
2313 /* Acquire new lock. */
2314 idl->lock_name = xstrdup(lock_name);
2315 ovsdb_idl_send_lock_request(idl);
2319 /* Returns true if 'idl' is configured to obtain a lock and owns that lock.
2321 * Locking and unlocking happens asynchronously from the database client's
2322 * point of view, so the information is only useful for optimization (e.g. if
2323 * the client doesn't have the lock then there's no point in trying to write to
2326 ovsdb_idl_has_lock(const struct ovsdb_idl *idl)
2328 return idl->has_lock;
2331 /* Returns true if 'idl' is configured to obtain a lock but the database server
2332 * has indicated that some other client already owns the requested lock. */
2334 ovsdb_idl_is_lock_contended(const struct ovsdb_idl *idl)
2336 return idl->is_lock_contended;
2340 ovsdb_idl_update_has_lock(struct ovsdb_idl *idl, bool new_has_lock)
2342 if (new_has_lock && !idl->has_lock) {
2343 if (!idl->monitor_request_id) {
2344 idl->change_seqno++;
2346 /* We're waiting for a monitor reply, so don't signal that the
2347 * database changed. The monitor reply will increment change_seqno
2350 idl->is_lock_contended = false;
2352 idl->has_lock = new_has_lock;
2356 ovsdb_idl_send_lock_request__(struct ovsdb_idl *idl, const char *method,
2359 ovsdb_idl_update_has_lock(idl, false);
2361 json_destroy(idl->lock_request_id);
2362 idl->lock_request_id = NULL;
2364 if (jsonrpc_session_is_connected(idl->session)) {
2365 struct json *params;
2367 params = json_array_create_1(json_string_create(idl->lock_name));
2368 jsonrpc_session_send(idl->session,
2369 jsonrpc_create_request(method, params, idp));
2374 ovsdb_idl_send_lock_request(struct ovsdb_idl *idl)
2376 ovsdb_idl_send_lock_request__(idl, "lock", &idl->lock_request_id);
2380 ovsdb_idl_send_unlock_request(struct ovsdb_idl *idl)
2382 ovsdb_idl_send_lock_request__(idl, "unlock", NULL);
2386 ovsdb_idl_parse_lock_reply(struct ovsdb_idl *idl, const struct json *result)
2390 json_destroy(idl->lock_request_id);
2391 idl->lock_request_id = NULL;
2393 if (result->type == JSON_OBJECT) {
2394 const struct json *locked;
2396 locked = shash_find_data(json_object(result), "locked");
2397 got_lock = locked && locked->type == JSON_TRUE;
2402 ovsdb_idl_update_has_lock(idl, got_lock);
2404 idl->is_lock_contended = true;
2409 ovsdb_idl_parse_lock_notify(struct ovsdb_idl *idl,
2410 const struct json *params,
2414 && params->type == JSON_ARRAY
2415 && json_array(params)->n > 0
2416 && json_array(params)->elems[0]->type == JSON_STRING) {
2417 const char *lock_name = json_string(json_array(params)->elems[0]);
2419 if (!strcmp(idl->lock_name, lock_name)) {
2420 ovsdb_idl_update_has_lock(idl, new_has_lock);
2421 if (!new_has_lock) {
2422 idl->is_lock_contended = true;