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695e5403 | 1 | /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2019 Nicira, Inc. |
93fe0264 | 2 | * Copyright (C) 2016 Hewlett Packard Enterprise Development LP |
c3bb4bd7 BP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #ifndef OVSDB_IDL_H | |
18 | #define OVSDB_IDL_H 1 | |
19 | ||
2ce42c88 BP |
20 | /* Open vSwitch Database Interface Definition Language (OVSDB IDL). |
21 | * | |
22 | * The OVSDB IDL maintains an in-memory replica of a database. It issues RPC | |
23 | * requests to an OVSDB database server and parses the responses, converting | |
24 | * raw JSON into data structures that are easier for clients to digest. Most | |
25 | * notably, references to rows via UUID become C pointers. | |
26 | * | |
d322ffc8 BP |
27 | * The IDL always presents a consistent snapshot of the database to its client, |
28 | * that is, it won't present the effects of some part of a transaction applied | |
29 | * at the database server without presenting all of its effects. | |
30 | * | |
2ce42c88 BP |
31 | * The IDL also assists with issuing database transactions. The client creates |
32 | * a transaction, manipulates the IDL data structures, and commits or aborts | |
33 | * the transaction. The IDL then composes and issues the necessary JSON-RPC | |
34 | * requests and reports to the client whether the transaction completed | |
35 | * successfully. | |
36 | */ | |
37 | ||
f3d64521 | 38 | #include <stdbool.h> |
b54e22e9 | 39 | #include <stdint.h> |
e1c0e2d1 | 40 | #include "compiler.h" |
8c3c2f30 | 41 | #include "ovsdb-types.h" |
16ebb90e LS |
42 | #include "ovsdb-data.h" |
43 | #include "openvswitch/list.h" | |
44 | #include "ovsdb-condition.h" | |
93fe0264 | 45 | #include "skiplist.h" |
b54e22e9 | 46 | |
9131abe2 YHW |
47 | #ifdef __cplusplus |
48 | extern "C" { | |
49 | #endif | |
50 | ||
b54e22e9 | 51 | struct json; |
979821c0 | 52 | struct ovsdb_datum; |
c3bb4bd7 | 53 | struct ovsdb_idl_class; |
932104f4 | 54 | struct ovsdb_idl_row; |
979821c0 BP |
55 | struct ovsdb_idl_column; |
56 | struct ovsdb_idl_table_class; | |
57 | struct uuid; | |
c3bb4bd7 BP |
58 | |
59 | struct ovsdb_idl *ovsdb_idl_create(const char *remote, | |
ef73f86c | 60 | const struct ovsdb_idl_class *, |
fba6bd1d BP |
61 | bool monitor_everything_by_default, |
62 | bool retry); | |
5e07b8f9 BP |
63 | struct ovsdb_idl *ovsdb_idl_create_unconnected( |
64 | const struct ovsdb_idl_class *, bool monitor_everything_by_default); | |
1b62572d | 65 | void ovsdb_idl_set_remote(struct ovsdb_idl *, const char *, bool); |
d5905055 | 66 | void ovsdb_idl_set_shuffle_remotes(struct ovsdb_idl *, bool); |
89b522ae | 67 | void ovsdb_idl_reset_min_index(struct ovsdb_idl *); |
c3bb4bd7 BP |
68 | void ovsdb_idl_destroy(struct ovsdb_idl *); |
69 | ||
1b1d2e6d BP |
70 | void ovsdb_idl_set_leader_only(struct ovsdb_idl *, bool leader_only); |
71 | ||
854a94d9 | 72 | void ovsdb_idl_run(struct ovsdb_idl *); |
c3bb4bd7 BP |
73 | void ovsdb_idl_wait(struct ovsdb_idl *); |
74 | ||
06b6d651 BP |
75 | void ovsdb_idl_set_lock(struct ovsdb_idl *, const char *lock_name); |
76 | bool ovsdb_idl_has_lock(const struct ovsdb_idl *); | |
77 | bool ovsdb_idl_is_lock_contended(const struct ovsdb_idl *); | |
78 | ||
7152b6fa | 79 | const struct uuid * ovsdb_idl_get_monitor_id(const struct ovsdb_idl *); |
c3bb4bd7 | 80 | unsigned int ovsdb_idl_get_seqno(const struct ovsdb_idl *); |
f3d64521 | 81 | bool ovsdb_idl_has_ever_connected(const struct ovsdb_idl *); |
705d7a39 | 82 | void ovsdb_idl_enable_reconnect(struct ovsdb_idl *); |
c3bb4bd7 | 83 | void ovsdb_idl_force_reconnect(struct ovsdb_idl *); |
8cdec725 | 84 | void ovsdb_idl_verify_write_only(struct ovsdb_idl *); |
fba6bd1d BP |
85 | |
86 | bool ovsdb_idl_is_alive(const struct ovsdb_idl *); | |
82b261b9 | 87 | bool ovsdb_idl_is_connected(const struct ovsdb_idl *idl); |
fba6bd1d | 88 | int ovsdb_idl_get_last_error(const struct ovsdb_idl *); |
a4927e36 HL |
89 | |
90 | void ovsdb_idl_set_probe_interval(const struct ovsdb_idl *, int probe_interval); | |
11990a52 BP |
91 | |
92 | void ovsdb_idl_check_consistency(const struct ovsdb_idl *); | |
a0b02897 BP |
93 | |
94 | const struct ovsdb_idl_class *ovsdb_idl_get_class(const struct ovsdb_idl *); | |
95 | const struct ovsdb_idl_table_class *ovsdb_idl_table_class_from_column( | |
96 | const struct ovsdb_idl_class *, const struct ovsdb_idl_column *); | |
ef73f86c | 97 | \f |
695e5403 BP |
98 | /* Choosing columns and tables to replicate. |
99 | * | |
100 | * The client may choose any subset of the columns and tables to replicate, | |
101 | * specifying it one of two ways: | |
102 | * | |
103 | * - As a blacklist (adding the columns or tables to replicate). To do so, | |
104 | * the client passes false as 'monitor_everything_by_default' to | |
105 | * ovsdb_idl_create() and then calls ovsdb_idl_add_column() and | |
106 | * ovsdb_idl_add_table() for the desired columns and, if necessary, tables. | |
107 | * | |
108 | * - As a whitelist (replicating all columns and tables except those | |
109 | * explicitly removed). To do so, the client passes true as | |
110 | * 'monitor_everything_by_default' to ovsdb_idl_create() and then calls | |
111 | * ovsdb_idl_omit() to remove columns. | |
112 | * | |
113 | * There are multiple modes a column may be replicated: | |
114 | * | |
115 | * - Read-only. This is the default. Whenever the column changes in any | |
116 | * replicated row, the value returned by ovsdb_idl_get_seqno() will change, | |
117 | * letting the client know to look at the replicated data again. | |
118 | * | |
119 | * - Write-only. This is for columns that the client sets and updates but | |
120 | * does not want to be alerted about its own updates (which, at the OVSDB | |
121 | * level, cannot be distinguished from updates made by any other client). | |
122 | * The column will be replicated in the same way as for read-only columns, | |
123 | * but the value returned by ovsdb_idl_get_seqno() will not change when the | |
124 | * column changes, saving wasted CPU time. | |
125 | * | |
126 | * (A "write-only" client probably does read the column so that it can know | |
127 | * whether it needs to update it, but it doesn't expect to react to changes | |
128 | * by other clients.) | |
129 | * | |
130 | * To mark a replicated column as write-only, a client calls | |
131 | * ovsdb_idl_omit_alert(). (The column must already be replicated one of | |
132 | * the ways described in the previous list.) | |
133 | * | |
134 | * This is an optimization only and does not affect behavioral correctness | |
135 | * of an otherwise well-written client. | |
136 | * | |
137 | * - Read/write. In theory, an OVSDB client might both read and write a | |
138 | * column, although OVSDB schemas are usually designed so that any given | |
139 | * client only does one or the other. This is actually the same as | |
140 | * read/write columns; that is, the client need take no special action. | |
141 | */ | |
ef73f86c | 142 | |
695e5403 BP |
143 | /* Modes with which the IDL can replicate a column. See above comment for |
144 | * overview. | |
ef73f86c | 145 | * |
695e5403 BP |
146 | * If no bits are set, the IDL does not replicate the column at all. The |
147 | * client will always see it with the default value for its type. | |
ef73f86c | 148 | * |
695e5403 BP |
149 | * If OVSDB_IDL_MONITOR is set, then the IDL replicates the column and sets it |
150 | * to to the value in the database. If OVSDB_IDL_ALERT is also set, then the | |
151 | * IDL will change the value returned by ovsdb_idl_get_seqno() when the | |
152 | * column's value changes in any row. | |
ef73f86c BP |
153 | * |
154 | * The possible mode combinations are: | |
155 | * | |
695e5403 BP |
156 | * - 0, for a column that a client doesn't care about. This is the default |
157 | * for every column in every table, if the client passes false for | |
158 | * 'monitor_everything_by_default' to ovsdb_idl_create(). | |
ef73f86c BP |
159 | * |
160 | * - (OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT), for a column that a client wants | |
695e5403 BP |
161 | * to track and possibly update. This is the default for every column in |
162 | * every table, if the client passes true for | |
163 | * 'monitor_everything_by_default' to ovsdb_idl_create(). | |
ef73f86c BP |
164 | * |
165 | * - OVSDB_IDL_MONITOR, for columns that a client treats as "write-only", | |
166 | * that is, it updates them but doesn't want to get alerted about its own | |
167 | * updates. It also won't be alerted about other clients' updates, so this | |
168 | * is suitable only for use by a client that "owns" a particular column. | |
695e5403 BP |
169 | * Use ovsdb_idl_omit_alert() to set a column that is already replicated to |
170 | * this mode. | |
ef73f86c BP |
171 | * |
172 | * - OVDSB_IDL_ALERT without OVSDB_IDL_MONITOR is not valid. | |
932104f4 SA |
173 | * |
174 | * - (OVSDB_IDL_MONITOR | OVSDB_IDL_ALERT | OVSDB_IDL_TRACK), for a column | |
175 | * that a client wants to track using the change tracking | |
176 | * ovsdb_idl_track_get_*() functions. | |
ef73f86c | 177 | */ |
695e5403 BP |
178 | #define OVSDB_IDL_MONITOR (1 << 0) /* Replicate this column? */ |
179 | #define OVSDB_IDL_ALERT (1 << 1) /* Alert client when column changes? */ | |
932104f4 | 180 | #define OVSDB_IDL_TRACK (1 << 2) |
ef73f86c BP |
181 | |
182 | void ovsdb_idl_add_column(struct ovsdb_idl *, const struct ovsdb_idl_column *); | |
183 | void ovsdb_idl_add_table(struct ovsdb_idl *, | |
184 | const struct ovsdb_idl_table_class *); | |
c3bb4bd7 | 185 | |
c547535a | 186 | void ovsdb_idl_omit(struct ovsdb_idl *, const struct ovsdb_idl_column *); |
ef73f86c | 187 | void ovsdb_idl_omit_alert(struct ovsdb_idl *, const struct ovsdb_idl_column *); |
932104f4 | 188 | |
104aec4e RM |
189 | /* Change tracking. |
190 | * | |
191 | * In OVSDB, change tracking is applied at each client in the IDL layer. This | |
192 | * means that when a client makes a request to track changes on a particular | |
193 | * table, they are essentially requesting information about the incremental | |
194 | * changes to that table from the point in time that the request is made. Once | |
195 | * the client clears tracked changes, that information will no longer be | |
196 | * available. | |
197 | * | |
198 | * The implication of the above is that if a client requires replaying | |
199 | * untracked history, it faces the choice of either trying to remember changes | |
200 | * itself (which translates into a memory leak) or of being structured with a | |
201 | * path for processing the full untracked table as well as a path that | |
202 | * processes incremental changes. */ | |
932104f4 SA |
203 | enum ovsdb_idl_change { |
204 | OVSDB_IDL_CHANGE_INSERT, | |
205 | OVSDB_IDL_CHANGE_MODIFY, | |
206 | OVSDB_IDL_CHANGE_DELETE, | |
207 | OVSDB_IDL_CHANGE_MAX | |
208 | }; | |
209 | ||
210 | /* Row, table sequence numbers */ | |
211 | unsigned int ovsdb_idl_table_get_seqno( | |
212 | const struct ovsdb_idl *idl, | |
213 | const struct ovsdb_idl_table_class *table_class); | |
214 | unsigned int ovsdb_idl_row_get_seqno( | |
215 | const struct ovsdb_idl_row *row, | |
216 | enum ovsdb_idl_change change); | |
217 | ||
218 | void ovsdb_idl_track_add_column(struct ovsdb_idl *idl, | |
219 | const struct ovsdb_idl_column *column); | |
220 | void ovsdb_idl_track_add_all(struct ovsdb_idl *idl); | |
221 | const struct ovsdb_idl_row *ovsdb_idl_track_get_first( | |
222 | const struct ovsdb_idl *, const struct ovsdb_idl_table_class *); | |
223 | const struct ovsdb_idl_row *ovsdb_idl_track_get_next(const struct ovsdb_idl_row *); | |
32d37ce8 SA |
224 | bool ovsdb_idl_track_is_updated(const struct ovsdb_idl_row *row, |
225 | const struct ovsdb_idl_column *column); | |
1456335d | 226 | void ovsdb_idl_track_clear(struct ovsdb_idl *); |
932104f4 | 227 | |
ef73f86c BP |
228 | \f |
229 | /* Reading the database replica. */ | |
c547535a | 230 | |
979821c0 BP |
231 | const struct ovsdb_idl_row *ovsdb_idl_get_row_for_uuid( |
232 | const struct ovsdb_idl *, const struct ovsdb_idl_table_class *, | |
233 | const struct uuid *); | |
234 | const struct ovsdb_idl_row *ovsdb_idl_first_row( | |
235 | const struct ovsdb_idl *, const struct ovsdb_idl_table_class *); | |
236 | const struct ovsdb_idl_row *ovsdb_idl_next_row(const struct ovsdb_idl_row *); | |
237 | ||
8c3c2f30 BP |
238 | const struct ovsdb_datum *ovsdb_idl_read(const struct ovsdb_idl_row *, |
239 | const struct ovsdb_idl_column *); | |
240 | const struct ovsdb_datum *ovsdb_idl_get(const struct ovsdb_idl_row *, | |
241 | const struct ovsdb_idl_column *, | |
242 | enum ovsdb_atomic_type key_type, | |
243 | enum ovsdb_atomic_type value_type); | |
ff495b63 BP |
244 | bool ovsdb_idl_is_mutable(const struct ovsdb_idl_row *, |
245 | const struct ovsdb_idl_column *); | |
cfea354b BP |
246 | |
247 | bool ovsdb_idl_row_is_synthetic(const struct ovsdb_idl_row *); | |
ef73f86c | 248 | \f |
2f926787 BP |
249 | /* Transactions. |
250 | * | |
251 | * A transaction may modify the contents of a database by modifying the values | |
252 | * of columns, deleting rows, inserting rows, or adding checks that columns in | |
253 | * the database have not changed ("verify" operations), through | |
254 | * ovsdb_idl_txn_*() functions. (The OVSDB IDL code generator produces helper | |
255 | * functions that internally call the ovsdb_idl_txn_*() functions. These are | |
256 | * likely to be more convenient.) | |
257 | * | |
258 | * Reading and writing columns and inserting and deleting rows are all | |
259 | * straightforward. The reasons to verify columns are less obvious. | |
260 | * Verification is the key to maintaining transactional integrity. Because | |
261 | * OVSDB handles multiple clients, it can happen that between the time that | |
262 | * OVSDB client A reads a column and writes a new value, OVSDB client B has | |
263 | * written that column. Client A's write should not ordinarily overwrite | |
264 | * client B's, especially if the column in question is a "map" column that | |
265 | * contains several more or less independent data items. If client A adds a | |
266 | * "verify" operation before it writes the column, then the transaction fails | |
267 | * in case client B modifies it first. Client A will then see the new value of | |
268 | * the column and compose a new transaction based on the new contents written | |
269 | * by client B. | |
270 | * | |
271 | * When a transaction is complete, which must be before the next call to | |
272 | * ovsdb_idl_run() on 'idl', call ovsdb_idl_txn_commit() or | |
273 | * ovsdb_idl_txn_abort(). | |
274 | * | |
275 | * The life-cycle of a transaction looks like this: | |
276 | * | |
277 | * 1. Create the transaction and record the initial sequence number: | |
278 | * | |
279 | * seqno = ovsdb_idl_get_seqno(idl); | |
280 | * txn = ovsdb_idl_txn_create(idl); | |
281 | * | |
282 | * 2. Modify the database with ovsdb_idl_txn_*() functions directly or | |
283 | * indirectly. | |
284 | * | |
285 | * 3. Commit the transaction by calling ovsdb_idl_txn_commit(). The first call | |
286 | * to this function probably returns TXN_INCOMPLETE. The client must keep | |
287 | * calling again along as this remains true, calling ovsdb_idl_run() in | |
288 | * between to let the IDL do protocol processing. (If the client doesn't | |
289 | * have anything else to do in the meantime, it can use | |
290 | * ovsdb_idl_txn_commit_block() to avoid having to loop itself.) | |
291 | * | |
292 | * 4. If the final status is TXN_TRY_AGAIN, wait for ovsdb_idl_get_seqno() to | |
293 | * change from the saved 'seqno' (it's possible that it's already changed, | |
294 | * in which case the client should not wait at all), then start over from | |
295 | * step 1. Only a call to ovsdb_idl_run() will change the return value of | |
296 | * ovsdb_idl_get_seqno(). (ovsdb_idl_txn_commit_block() calls | |
297 | * ovsdb_idl_run().) | |
298 | */ | |
8c3c2f30 | 299 | |
475281c0 | 300 | enum ovsdb_idl_txn_status { |
2096903b | 301 | TXN_UNCOMMITTED, /* Not yet committed or aborted. */ |
b54e22e9 | 302 | TXN_UNCHANGED, /* Transaction didn't include any changes. */ |
475281c0 BP |
303 | TXN_INCOMPLETE, /* Commit in progress, please wait. */ |
304 | TXN_ABORTED, /* ovsdb_idl_txn_abort() called. */ | |
305 | TXN_SUCCESS, /* Commit successful. */ | |
854a94d9 | 306 | TXN_TRY_AGAIN, /* Commit failed because a "verify" operation |
475281c0 | 307 | * reported an inconsistency, due to a network |
4fdfe5cc BP |
308 | * problem, or other transient failure. Wait |
309 | * for a change, then try again. */ | |
06b6d651 | 310 | TXN_NOT_LOCKED, /* Server hasn't given us the lock yet. */ |
475281c0 BP |
311 | TXN_ERROR /* Commit failed due to a hard error. */ |
312 | }; | |
313 | ||
314 | const char *ovsdb_idl_txn_status_to_string(enum ovsdb_idl_txn_status); | |
315 | ||
316 | struct ovsdb_idl_txn *ovsdb_idl_txn_create(struct ovsdb_idl *); | |
e1c0e2d1 | 317 | void ovsdb_idl_txn_add_comment(struct ovsdb_idl_txn *, const char *, ...) |
cab50449 | 318 | OVS_PRINTF_FORMAT (2, 3); |
577aebdf | 319 | void ovsdb_idl_txn_set_dry_run(struct ovsdb_idl_txn *); |
94fbe1aa BP |
320 | void ovsdb_idl_txn_increment(struct ovsdb_idl_txn *, |
321 | const struct ovsdb_idl_row *, | |
de32cec7 BP |
322 | const struct ovsdb_idl_column *, |
323 | bool force); | |
475281c0 | 324 | void ovsdb_idl_txn_destroy(struct ovsdb_idl_txn *); |
586bb84a | 325 | void ovsdb_idl_txn_wait(const struct ovsdb_idl_txn *); |
475281c0 | 326 | enum ovsdb_idl_txn_status ovsdb_idl_txn_commit(struct ovsdb_idl_txn *); |
af96ccd2 | 327 | enum ovsdb_idl_txn_status ovsdb_idl_txn_commit_block(struct ovsdb_idl_txn *); |
475281c0 BP |
328 | void ovsdb_idl_txn_abort(struct ovsdb_idl_txn *); |
329 | ||
91e310a5 BP |
330 | const char *ovsdb_idl_txn_get_error(const struct ovsdb_idl_txn *); |
331 | ||
69490970 BP |
332 | int64_t ovsdb_idl_txn_get_increment_new_value(const struct ovsdb_idl_txn *); |
333 | const struct uuid *ovsdb_idl_txn_get_insert_uuid(const struct ovsdb_idl_txn *, | |
334 | const struct uuid *); | |
335 | ||
979821c0 BP |
336 | void ovsdb_idl_txn_write(const struct ovsdb_idl_row *, |
337 | const struct ovsdb_idl_column *, | |
338 | struct ovsdb_datum *); | |
fe19569a BP |
339 | void ovsdb_idl_txn_write_clone(const struct ovsdb_idl_row *, |
340 | const struct ovsdb_idl_column *, | |
341 | const struct ovsdb_datum *); | |
f199df26 EA |
342 | void ovsdb_idl_txn_write_partial_map(const struct ovsdb_idl_row *, |
343 | const struct ovsdb_idl_column *, | |
344 | struct ovsdb_datum *); | |
345 | void ovsdb_idl_txn_delete_partial_map(const struct ovsdb_idl_row *, | |
346 | const struct ovsdb_idl_column *, | |
347 | struct ovsdb_datum *); | |
f1ab6e06 RM |
348 | void ovsdb_idl_txn_write_partial_set(const struct ovsdb_idl_row *, |
349 | const struct ovsdb_idl_column *, | |
350 | struct ovsdb_datum *); | |
351 | void ovsdb_idl_txn_delete_partial_set(const struct ovsdb_idl_row *, | |
352 | const struct ovsdb_idl_column *, | |
353 | struct ovsdb_datum *); | |
9e336f49 BP |
354 | void ovsdb_idl_txn_delete(const struct ovsdb_idl_row *); |
355 | const struct ovsdb_idl_row *ovsdb_idl_txn_insert( | |
ce5a3e38 BP |
356 | struct ovsdb_idl_txn *, const struct ovsdb_idl_table_class *, |
357 | const struct uuid *); | |
979821c0 | 358 | |
1e86ae6f | 359 | struct ovsdb_idl *ovsdb_idl_txn_get_idl (struct ovsdb_idl_txn *); |
a660eac8 | 360 | void ovsdb_idl_get_initial_snapshot(struct ovsdb_idl *); |
a548a764 AW |
361 | \f |
362 | ||
363 | /* ovsdb_idl_loop provides an easy way to manage the transactions related | |
364 | * to 'idl' and to cope with different status during transaction. */ | |
365 | struct ovsdb_idl_loop { | |
366 | struct ovsdb_idl *idl; | |
367 | unsigned int skip_seqno; | |
368 | ||
369 | struct ovsdb_idl_txn *committing_txn; | |
370 | unsigned int precommit_seqno; | |
371 | ||
372 | struct ovsdb_idl_txn *open_txn; | |
fa183acc BP |
373 | |
374 | /* These members allow a client a simple, stateless way to keep track of | |
375 | * transactions that commit: when a transaction commits successfully, | |
376 | * ovsdb_idl_loop_commit_and_wait() copies 'next_cfg' to 'cur_cfg'. Thus, | |
377 | * the client can set 'next_cfg' to a value that indicates a successful | |
378 | * commit and check 'cur_cfg' on each iteration. */ | |
379 | int64_t cur_cfg; | |
380 | int64_t next_cfg; | |
a548a764 AW |
381 | }; |
382 | ||
383 | #define OVSDB_IDL_LOOP_INITIALIZER(IDL) { .idl = (IDL) } | |
384 | ||
385 | void ovsdb_idl_loop_destroy(struct ovsdb_idl_loop *); | |
386 | struct ovsdb_idl_txn *ovsdb_idl_loop_run(struct ovsdb_idl_loop *); | |
8ba0e38a | 387 | int ovsdb_idl_loop_commit_and_wait(struct ovsdb_idl_loop *); |
239fa5bb BP |
388 | \f |
389 | /* Conditional Replication | |
390 | * ======================= | |
391 | * | |
392 | * By default, when the IDL replicates a particular table in the database, it | |
393 | * replicates every row in the table. These functions allow the client to | |
394 | * specify that only selected rows should be replicated, by constructing a | |
395 | * per-table condition that specifies the rows to replicate. | |
0164e367 BP |
396 | * |
397 | * A condition is a disjunction of clauses. The condition is true, and thus a | |
398 | * row is replicated, if any of the clauses evaluates to true for a given row. | |
399 | * (Thus, a condition with no clauses is always false.) | |
239fa5bb | 400 | */ |
16ebb90e | 401 | |
0164e367 BP |
402 | struct ovsdb_idl_condition { |
403 | struct hmap clauses; /* Contains "struct ovsdb_idl_clause"s. */ | |
404 | bool is_true; /* Is the condition unconditionally true? */ | |
405 | }; | |
406 | #define OVSDB_IDL_CONDITION_INIT(CONDITION) \ | |
407 | { HMAP_INITIALIZER(&(CONDITION)->clauses), false } | |
408 | ||
409 | void ovsdb_idl_condition_init(struct ovsdb_idl_condition *); | |
410 | void ovsdb_idl_condition_clear(struct ovsdb_idl_condition *); | |
411 | void ovsdb_idl_condition_destroy(struct ovsdb_idl_condition *); | |
412 | void ovsdb_idl_condition_add_clause(struct ovsdb_idl_condition *, | |
16ebb90e LS |
413 | enum ovsdb_function function, |
414 | const struct ovsdb_idl_column *column, | |
239fa5bb | 415 | const struct ovsdb_datum *arg); |
0164e367 BP |
416 | void ovsdb_idl_condition_add_clause_true(struct ovsdb_idl_condition *); |
417 | bool ovsdb_idl_condition_is_true(const struct ovsdb_idl_condition *); | |
418 | ||
46437c52 AZ |
419 | unsigned int ovsdb_idl_set_condition(struct ovsdb_idl *, |
420 | const struct ovsdb_idl_table_class *, | |
421 | const struct ovsdb_idl_condition *); | |
16ebb90e | 422 | |
46437c52 | 423 | unsigned int ovsdb_idl_get_condition_seqno(const struct ovsdb_idl *); |
d14e007c BP |
424 | \f |
425 | /* Indexes over one or more columns in the IDL, to retrieve rows matching | |
426 | * particular search criteria and to iterate over a subset of rows in a defined | |
427 | * order. */ | |
93fe0264 | 428 | |
d14e007c BP |
429 | enum ovsdb_index_order { |
430 | OVSDB_INDEX_ASC, /* 0, 1, 2, ... */ | |
431 | OVSDB_INDEX_DESC /* 2, 1, 0, ... */ | |
432 | }; | |
93fe0264 | 433 | |
d14e007c | 434 | typedef int column_comparator_func(const void *a, const void *b); |
93fe0264 | 435 | |
d14e007c BP |
436 | struct ovsdb_idl_index_column { |
437 | const struct ovsdb_idl_column *column; | |
438 | column_comparator_func *comparer; | |
439 | enum ovsdb_index_order order; | |
440 | }; | |
93fe0264 | 441 | |
d14e007c BP |
442 | /* Creating an index. */ |
443 | struct ovsdb_idl_index *ovsdb_idl_index_create( | |
444 | struct ovsdb_idl *, const struct ovsdb_idl_index_column *, size_t n); | |
445 | struct ovsdb_idl_index *ovsdb_idl_index_create1( | |
446 | struct ovsdb_idl *, const struct ovsdb_idl_column *); | |
447 | struct ovsdb_idl_index *ovsdb_idl_index_create2( | |
448 | struct ovsdb_idl *, const struct ovsdb_idl_column *, | |
449 | const struct ovsdb_idl_column *); | |
450 | ||
451 | /* Searching an index. */ | |
452 | struct ovsdb_idl_row *ovsdb_idl_index_find(struct ovsdb_idl_index *, | |
453 | const struct ovsdb_idl_row *); | |
454 | \f | |
455 | /* Iteration over an index. | |
456 | * | |
457 | * Usually these would be invoked through table-specific wrappers generated | |
458 | * by the IDL. */ | |
459 | ||
460 | struct ovsdb_idl_cursor { | |
461 | struct ovsdb_idl_index *index; /* Index being iterated. */ | |
462 | struct skiplist_node *position; /* Current position in 'index'. */ | |
93fe0264 LR |
463 | }; |
464 | ||
d14e007c BP |
465 | struct ovsdb_idl_cursor ovsdb_idl_cursor_first(struct ovsdb_idl_index *); |
466 | struct ovsdb_idl_cursor ovsdb_idl_cursor_first_eq( | |
467 | struct ovsdb_idl_index *, const struct ovsdb_idl_row *); | |
468 | struct ovsdb_idl_cursor ovsdb_idl_cursor_first_ge( | |
469 | struct ovsdb_idl_index *, const struct ovsdb_idl_row *); | |
470 | ||
471 | void ovsdb_idl_cursor_next(struct ovsdb_idl_cursor *); | |
472 | void ovsdb_idl_cursor_next_eq(struct ovsdb_idl_cursor *); | |
473 | ||
474 | struct ovsdb_idl_row *ovsdb_idl_cursor_data(struct ovsdb_idl_cursor *); | |
9131abe2 YHW |
475 | |
476 | #ifdef __cplusplus | |
477 | } | |
478 | #endif | |
479 | ||
c3bb4bd7 | 480 | #endif /* ovsdb-idl.h */ |