1 /* Copyright (c) 2009, 2010, 2011, 2012, 2014 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-data.h"
25 #include "openvswitch/dynamic-string.h"
27 #include "ovs-thread.h"
28 #include "ovsdb-error.h"
29 #include "ovsdb-parser.h"
30 #include "openvswitch/json.h"
31 #include "openvswitch/shash.h"
38 wrap_json(const char *name, struct json *wrapped)
40 return json_array_create_2(json_string_create(name), wrapped);
43 /* Initializes 'atom' with the default value of the given 'type'.
45 * The default value for an atom is as defined in RFC 7047:
47 * - "integer" or "real": 0
51 * - "string": "" (the empty string)
53 * - "uuid": 00000000-0000-0000-0000-000000000000
55 * The caller must eventually arrange for 'atom' to be destroyed (with
56 * ovsdb_atom_destroy()). */
58 ovsdb_atom_init_default(union ovsdb_atom *atom, enum ovsdb_atomic_type type)
64 case OVSDB_TYPE_INTEGER:
72 case OVSDB_TYPE_BOOLEAN:
73 atom->boolean = false;
76 case OVSDB_TYPE_STRING:
77 atom->string = xmemdup("", 1);
81 uuid_zero(&atom->uuid);
90 /* Returns a read-only atom of the given 'type' that has the default value for
91 * 'type'. The caller must not modify or free the returned atom.
93 * See ovsdb_atom_init_default() for an explanation of the default value of an
95 const union ovsdb_atom *
96 ovsdb_atom_default(enum ovsdb_atomic_type type)
98 static union ovsdb_atom default_atoms[OVSDB_N_TYPES];
99 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
101 if (ovsthread_once_start(&once)) {
104 for (i = 0; i < OVSDB_N_TYPES; i++) {
105 if (i != OVSDB_TYPE_VOID) {
106 ovsdb_atom_init_default(&default_atoms[i], i);
109 ovsthread_once_done(&once);
112 ovs_assert(ovsdb_atomic_type_is_valid(type));
113 return &default_atoms[type];
116 /* Returns true if 'atom', which must have the given 'type', has the default
117 * value for that type.
119 * See ovsdb_atom_init_default() for an explanation of the default value of an
122 ovsdb_atom_is_default(const union ovsdb_atom *atom,
123 enum ovsdb_atomic_type type)
126 case OVSDB_TYPE_VOID:
129 case OVSDB_TYPE_INTEGER:
130 return atom->integer == 0;
132 case OVSDB_TYPE_REAL:
133 return atom->real == 0.0;
135 case OVSDB_TYPE_BOOLEAN:
136 return atom->boolean == false;
138 case OVSDB_TYPE_STRING:
139 return atom->string[0] == '\0';
141 case OVSDB_TYPE_UUID:
142 return uuid_is_zero(&atom->uuid);
150 /* Initializes 'new' as a copy of 'old', with the given 'type'.
152 * The caller must eventually arrange for 'new' to be destroyed (with
153 * ovsdb_atom_destroy()). */
155 ovsdb_atom_clone(union ovsdb_atom *new, const union ovsdb_atom *old,
156 enum ovsdb_atomic_type type)
159 case OVSDB_TYPE_VOID:
162 case OVSDB_TYPE_INTEGER:
163 new->integer = old->integer;
166 case OVSDB_TYPE_REAL:
167 new->real = old->real;
170 case OVSDB_TYPE_BOOLEAN:
171 new->boolean = old->boolean;
174 case OVSDB_TYPE_STRING:
175 new->string = xstrdup(old->string);
178 case OVSDB_TYPE_UUID:
179 new->uuid = old->uuid;
188 /* Swaps the contents of 'a' and 'b', which need not have the same type. */
190 ovsdb_atom_swap(union ovsdb_atom *a, union ovsdb_atom *b)
192 union ovsdb_atom tmp = *a;
197 /* Returns a hash value for 'atom', which has the specified 'type', folding
198 * 'basis' into the calculation. */
200 ovsdb_atom_hash(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
204 case OVSDB_TYPE_VOID:
207 case OVSDB_TYPE_INTEGER:
208 return hash_int(atom->integer, basis);
210 case OVSDB_TYPE_REAL:
211 return hash_double(atom->real, basis);
213 case OVSDB_TYPE_BOOLEAN:
214 return hash_boolean(atom->boolean, basis);
216 case OVSDB_TYPE_STRING:
217 return hash_string(atom->string, basis);
219 case OVSDB_TYPE_UUID:
220 return hash_int(uuid_hash(&atom->uuid), basis);
228 /* Compares 'a' and 'b', which both have type 'type', and returns a
229 * strcmp()-like result. */
231 ovsdb_atom_compare_3way(const union ovsdb_atom *a,
232 const union ovsdb_atom *b,
233 enum ovsdb_atomic_type type)
236 case OVSDB_TYPE_VOID:
239 case OVSDB_TYPE_INTEGER:
240 return a->integer < b->integer ? -1 : a->integer > b->integer;
242 case OVSDB_TYPE_REAL:
243 return a->real < b->real ? -1 : a->real > b->real;
245 case OVSDB_TYPE_BOOLEAN:
246 return a->boolean - b->boolean;
248 case OVSDB_TYPE_STRING:
249 return strcmp(a->string, b->string);
251 case OVSDB_TYPE_UUID:
252 return uuid_compare_3way(&a->uuid, &b->uuid);
260 static struct ovsdb_error *
261 unwrap_json(const struct json *json, const char *name,
262 enum json_type value_type, const struct json **value)
264 if (json->type != JSON_ARRAY
265 || json->u.array.n != 2
266 || json->u.array.elems[0]->type != JSON_STRING
267 || (name && strcmp(json->u.array.elems[0]->u.string, name))
268 || json->u.array.elems[1]->type != value_type)
271 return ovsdb_syntax_error(json, NULL, "expected [\"%s\", <%s>]", name,
272 json_type_to_string(value_type));
274 *value = json->u.array.elems[1];
278 static struct ovsdb_error *
279 parse_json_pair(const struct json *json,
280 const struct json **elem0, const struct json **elem1)
282 if (json->type != JSON_ARRAY || json->u.array.n != 2) {
283 return ovsdb_syntax_error(json, NULL, "expected 2-element array");
285 *elem0 = json->u.array.elems[0];
286 *elem1 = json->u.array.elems[1];
291 ovsdb_symbol_referenced(struct ovsdb_symbol *symbol,
292 const struct ovsdb_base_type *base)
294 ovs_assert(base->type == OVSDB_TYPE_UUID);
296 if (base->u.uuid.refTableName) {
297 switch (base->u.uuid.refType) {
298 case OVSDB_REF_STRONG:
299 symbol->strong_ref = true;
302 symbol->weak_ref = true;
308 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
309 ovsdb_atom_parse_uuid(struct uuid *uuid, const struct json *json,
310 struct ovsdb_symbol_table *symtab,
311 const struct ovsdb_base_type *base)
313 struct ovsdb_error *error0;
314 const struct json *value;
316 error0 = unwrap_json(json, "uuid", JSON_STRING, &value);
318 const char *uuid_string = json_string(value);
319 if (!uuid_from_string(uuid, uuid_string)) {
320 return ovsdb_syntax_error(json, NULL, "\"%s\" is not a valid UUID",
324 struct ovsdb_error *error1;
326 error1 = unwrap_json(json, "named-uuid", JSON_STRING, &value);
328 struct ovsdb_symbol *symbol;
330 ovsdb_error_destroy(error0);
331 if (!ovsdb_parser_is_id(json_string(value))) {
332 return ovsdb_syntax_error(json, NULL, "named-uuid string is "
336 symbol = ovsdb_symbol_table_insert(symtab, json_string(value));
337 *uuid = symbol->uuid;
338 ovsdb_symbol_referenced(symbol, base);
341 ovsdb_error_destroy(error1);
347 static struct ovsdb_error * OVS_WARN_UNUSED_RESULT
348 ovsdb_atom_from_json__(union ovsdb_atom *atom,
349 const struct ovsdb_base_type *base,
350 const struct json *json,
351 struct ovsdb_symbol_table *symtab)
353 enum ovsdb_atomic_type type = base->type;
356 case OVSDB_TYPE_VOID:
359 case OVSDB_TYPE_INTEGER:
360 if (json->type == JSON_INTEGER) {
361 atom->integer = json->u.integer;
366 case OVSDB_TYPE_REAL:
367 if (json->type == JSON_INTEGER) {
368 atom->real = json->u.integer;
370 } else if (json->type == JSON_REAL) {
371 atom->real = json->u.real;
376 case OVSDB_TYPE_BOOLEAN:
377 if (json->type == JSON_TRUE) {
378 atom->boolean = true;
380 } else if (json->type == JSON_FALSE) {
381 atom->boolean = false;
386 case OVSDB_TYPE_STRING:
387 if (json->type == JSON_STRING) {
388 atom->string = xstrdup(json->u.string);
393 case OVSDB_TYPE_UUID:
394 return ovsdb_atom_parse_uuid(&atom->uuid, json, symtab, base);
401 return ovsdb_syntax_error(json, NULL, "expected %s",
402 ovsdb_atomic_type_to_string(type));
405 /* Parses 'json' as an atom of the type described by 'base'. If successful,
406 * returns NULL and initializes 'atom' with the parsed atom. On failure,
407 * returns an error and the contents of 'atom' are indeterminate. The caller
408 * is responsible for freeing the error or the atom that is returned.
410 * Violations of constraints expressed by 'base' are treated as errors.
412 * If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted. Refer to
413 * RFC 7047 for information about this, and for the syntax that this function
414 * accepts. If 'base' is a reference and a symbol is parsed, then the symbol's
415 * 'strong_ref' or 'weak_ref' member is set to true, as appropriate. */
417 ovsdb_atom_from_json(union ovsdb_atom *atom,
418 const struct ovsdb_base_type *base,
419 const struct json *json,
420 struct ovsdb_symbol_table *symtab)
422 struct ovsdb_error *error;
424 error = ovsdb_atom_from_json__(atom, base, json, symtab);
429 error = ovsdb_atom_check_constraints(atom, base);
431 ovsdb_atom_destroy(atom, base->type);
436 /* Converts 'atom', of the specified 'type', to JSON format, and returns the
437 * JSON. The caller is responsible for freeing the returned JSON.
439 * Refer to RFC 7047 for the format of the JSON that this function produces. */
441 ovsdb_atom_to_json(const union ovsdb_atom *atom, enum ovsdb_atomic_type type)
444 case OVSDB_TYPE_VOID:
447 case OVSDB_TYPE_INTEGER:
448 return json_integer_create(atom->integer);
450 case OVSDB_TYPE_REAL:
451 return json_real_create(atom->real);
453 case OVSDB_TYPE_BOOLEAN:
454 return json_boolean_create(atom->boolean);
456 case OVSDB_TYPE_STRING:
457 return json_string_create(atom->string);
459 case OVSDB_TYPE_UUID:
460 return wrap_json("uuid", json_string_create_nocopy(
461 xasprintf(UUID_FMT, UUID_ARGS(&atom->uuid))));
470 ovsdb_atom_from_string__(union ovsdb_atom *atom,
471 const struct ovsdb_base_type *base, const char *s,
472 struct ovsdb_symbol_table *symtab)
474 enum ovsdb_atomic_type type = base->type;
477 case OVSDB_TYPE_VOID:
480 case OVSDB_TYPE_INTEGER: {
481 long long int integer;
482 if (!str_to_llong(s, 10, &integer)) {
483 return xasprintf("\"%s\" is not a valid integer", s);
485 atom->integer = integer;
489 case OVSDB_TYPE_REAL:
490 if (!str_to_double(s, &atom->real)) {
491 return xasprintf("\"%s\" is not a valid real number", s);
493 /* Our JSON input routines map negative zero to zero, so do that here
494 * too for consistency. */
495 if (atom->real == 0.0) {
500 case OVSDB_TYPE_BOOLEAN:
501 if (!strcmp(s, "true") || !strcmp(s, "yes") || !strcmp(s, "on")
502 || !strcmp(s, "1")) {
503 atom->boolean = true;
504 } else if (!strcmp(s, "false") || !strcmp(s, "no") || !strcmp(s, "off")
505 || !strcmp(s, "0")) {
506 atom->boolean = false;
508 return xasprintf("\"%s\" is not a valid boolean "
509 "(use \"true\" or \"false\")", s);
513 case OVSDB_TYPE_STRING:
515 return xstrdup("An empty string is not valid as input; "
516 "use \"\" to represent the empty string");
517 } else if (*s == '"') {
518 size_t s_len = strlen(s);
520 if (s_len < 2 || s[s_len - 1] != '"') {
521 return xasprintf("%s: missing quote at end of "
523 } else if (!json_string_unescape(s + 1, s_len - 2,
525 char *error = xasprintf("%s: %s", s, atom->string);
530 atom->string = xstrdup(s);
534 case OVSDB_TYPE_UUID:
536 struct ovsdb_symbol *symbol = ovsdb_symbol_table_insert(symtab, s);
537 atom->uuid = symbol->uuid;
538 ovsdb_symbol_referenced(symbol, base);
539 } else if (!uuid_from_string(&atom->uuid, s)) {
540 return xasprintf("\"%s\" is not a valid UUID", s);
552 /* Initializes 'atom' to a value of type 'base' parsed from 's', which takes
553 * one of the following forms:
555 * - OVSDB_TYPE_INTEGER: A decimal integer optionally preceded by a sign.
557 * - OVSDB_TYPE_REAL: A floating-point number in the format accepted by
560 * - OVSDB_TYPE_BOOLEAN: "true", "yes", "on", "1" for true, or "false",
561 * "no", "off", or "0" for false.
563 * - OVSDB_TYPE_STRING: A JSON string if it begins with a quote, otherwise
564 * an arbitrary string.
566 * - OVSDB_TYPE_UUID: A UUID in RFC 4122 format. If 'symtab' is nonnull,
567 * then an identifier beginning with '@' is also acceptable. If the
568 * named identifier is already in 'symtab', then the associated UUID is
569 * used; otherwise, a new, random UUID is used and added to the symbol
570 * table. If 'base' is a reference and a symbol is parsed, then the
571 * symbol's 'strong_ref' or 'weak_ref' member is set to true, as
574 * Returns a null pointer if successful, otherwise an error message describing
575 * the problem. On failure, the contents of 'atom' are indeterminate. The
576 * caller is responsible for freeing the atom or the error.
579 ovsdb_atom_from_string(union ovsdb_atom *atom,
580 const struct ovsdb_base_type *base, const char *s,
581 struct ovsdb_symbol_table *symtab)
583 struct ovsdb_error *error;
586 msg = ovsdb_atom_from_string__(atom, base, s, symtab);
591 error = ovsdb_atom_check_constraints(atom, base);
593 ovsdb_atom_destroy(atom, base->type);
594 msg = ovsdb_error_to_string(error);
595 ovsdb_error_destroy(error);
601 string_needs_quotes(const char *s)
607 if (!isalpha(c) && c != '_') {
611 while ((c = *p++) != '\0') {
612 if (!isalpha(c) && c != '_' && c != '-' && c != '.') {
617 if (!strcmp(s, "true") || !strcmp(s, "false")) {
624 /* Appends 'atom' (which has the given 'type') to 'out', in a format acceptable
625 * to ovsdb_atom_from_string(). */
627 ovsdb_atom_to_string(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
631 case OVSDB_TYPE_VOID:
634 case OVSDB_TYPE_INTEGER:
635 ds_put_format(out, "%"PRId64, atom->integer);
638 case OVSDB_TYPE_REAL:
639 ds_put_format(out, "%.*g", DBL_DIG, atom->real);
642 case OVSDB_TYPE_BOOLEAN:
643 ds_put_cstr(out, atom->boolean ? "true" : "false");
646 case OVSDB_TYPE_STRING:
647 if (string_needs_quotes(atom->string)) {
650 json.type = JSON_STRING;
651 json.u.string = atom->string;
652 json_to_ds(&json, 0, out);
654 ds_put_cstr(out, atom->string);
658 case OVSDB_TYPE_UUID:
659 ds_put_format(out, UUID_FMT, UUID_ARGS(&atom->uuid));
668 /* Appends 'atom' (which has the given 'type') to 'out', in a bare string
669 * format that cannot be parsed uniformly back into a datum but is easier for
670 * shell scripts, etc., to deal with. */
672 ovsdb_atom_to_bare(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
675 if (type == OVSDB_TYPE_STRING) {
676 ds_put_cstr(out, atom->string);
678 ovsdb_atom_to_string(atom, type, out);
682 static struct ovsdb_error *
683 check_string_constraints(const char *s,
684 const struct ovsdb_string_constraints *c)
689 msg = utf8_validate(s, &n_chars);
691 struct ovsdb_error *error;
693 error = ovsdb_error("constraint violation",
694 "not a valid UTF-8 string: %s", msg);
699 if (n_chars < c->minLen) {
701 "constraint violation",
702 "\"%s\" length %"PRIuSIZE" is less than minimum allowed "
703 "length %u", s, n_chars, c->minLen);
704 } else if (n_chars > c->maxLen) {
706 "constraint violation",
707 "\"%s\" length %"PRIuSIZE" is greater than maximum allowed "
708 "length %u", s, n_chars, c->maxLen);
714 /* Checks whether 'atom' meets the constraints (if any) defined in 'base'.
715 * (base->type must specify 'atom''s type.) Returns a null pointer if the
716 * constraints are met, otherwise an error that explains the violation.
718 * Checking UUID constraints is deferred to transaction commit time, so this
719 * function does nothing for UUID constraints. */
721 ovsdb_atom_check_constraints(const union ovsdb_atom *atom,
722 const struct ovsdb_base_type *base)
725 && ovsdb_datum_find_key(base->enum_, atom, base->type) == UINT_MAX) {
726 struct ovsdb_error *error;
727 struct ds actual = DS_EMPTY_INITIALIZER;
728 struct ds valid = DS_EMPTY_INITIALIZER;
730 ovsdb_atom_to_string(atom, base->type, &actual);
731 ovsdb_datum_to_string(base->enum_,
732 ovsdb_base_type_get_enum_type(base->type),
734 error = ovsdb_error("constraint violation",
735 "%s is not one of the allowed values (%s)",
736 ds_cstr(&actual), ds_cstr(&valid));
743 switch (base->type) {
744 case OVSDB_TYPE_VOID:
747 case OVSDB_TYPE_INTEGER:
748 if (atom->integer >= base->u.integer.min
749 && atom->integer <= base->u.integer.max) {
751 } else if (base->u.integer.min != INT64_MIN) {
752 if (base->u.integer.max != INT64_MAX) {
753 return ovsdb_error("constraint violation",
754 "%"PRId64" is not in the valid range "
755 "%"PRId64" to %"PRId64" (inclusive)",
757 base->u.integer.min, base->u.integer.max);
759 return ovsdb_error("constraint violation",
760 "%"PRId64" is less than minimum allowed "
762 atom->integer, base->u.integer.min);
765 return ovsdb_error("constraint violation",
766 "%"PRId64" is greater than maximum allowed "
768 atom->integer, base->u.integer.max);
772 case OVSDB_TYPE_REAL:
773 if (atom->real >= base->u.real.min && atom->real <= base->u.real.max) {
775 } else if (base->u.real.min != -DBL_MAX) {
776 if (base->u.real.max != DBL_MAX) {
777 return ovsdb_error("constraint violation",
778 "%.*g is not in the valid range "
779 "%.*g to %.*g (inclusive)",
781 DBL_DIG, base->u.real.min,
782 DBL_DIG, base->u.real.max);
784 return ovsdb_error("constraint violation",
785 "%.*g is less than minimum allowed "
788 DBL_DIG, base->u.real.min);
791 return ovsdb_error("constraint violation",
792 "%.*g is greater than maximum allowed "
795 DBL_DIG, base->u.real.max);
799 case OVSDB_TYPE_BOOLEAN:
802 case OVSDB_TYPE_STRING:
803 return check_string_constraints(atom->string, &base->u.string);
805 case OVSDB_TYPE_UUID:
814 static union ovsdb_atom *
815 alloc_default_atoms(enum ovsdb_atomic_type type, size_t n)
817 if (type != OVSDB_TYPE_VOID && n) {
818 union ovsdb_atom *atoms;
821 atoms = xmalloc(n * sizeof *atoms);
822 for (i = 0; i < n; i++) {
823 ovsdb_atom_init_default(&atoms[i], type);
827 /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is
828 * treated as xmalloc(1). */
833 /* Initializes 'datum' as an empty datum. (An empty datum can be treated as
836 ovsdb_datum_init_empty(struct ovsdb_datum *datum)
840 datum->values = NULL;
843 /* Initializes 'datum' as a datum that has the default value for 'type'.
845 * The default value for a particular type is as defined in RFC 7047:
847 * - If n_min is 0, then the default value is the empty set (or map).
849 * - If n_min is 1, the default value is a single value or a single
850 * key-value pair, whose key and value are the defaults for their
851 * atomic types. (See ovsdb_atom_init_default() for details.)
853 * - n_min > 1 is invalid. See ovsdb_type_is_valid().
856 ovsdb_datum_init_default(struct ovsdb_datum *datum,
857 const struct ovsdb_type *type)
859 datum->n = type->n_min;
860 datum->keys = alloc_default_atoms(type->key.type, datum->n);
861 datum->values = alloc_default_atoms(type->value.type, datum->n);
864 /* Returns a read-only datum of the given 'type' that has the default value for
865 * 'type'. The caller must not modify or free the returned datum.
867 * See ovsdb_datum_init_default() for an explanation of the default value of a
869 const struct ovsdb_datum *
870 ovsdb_datum_default(const struct ovsdb_type *type)
872 if (type->n_min == 0) {
873 static const struct ovsdb_datum empty;
875 } else if (type->n_min == 1) {
876 static struct ovsdb_datum default_data[OVSDB_N_TYPES][OVSDB_N_TYPES];
877 struct ovsdb_datum *d;
878 int kt = type->key.type;
879 int vt = type->value.type;
881 ovs_assert(ovsdb_type_is_valid(type));
883 d = &default_data[kt][vt];
886 d->keys = CONST_CAST(union ovsdb_atom *, ovsdb_atom_default(kt));
887 if (vt != OVSDB_TYPE_VOID) {
888 d->values = CONST_CAST(union ovsdb_atom *,
889 ovsdb_atom_default(vt));
898 /* Returns true if 'datum', which must have the given 'type', has the default
899 * value for that type.
901 * See ovsdb_datum_init_default() for an explanation of the default value of a
904 ovsdb_datum_is_default(const struct ovsdb_datum *datum,
905 const struct ovsdb_type *type)
909 if (datum->n != type->n_min) {
912 for (i = 0; i < datum->n; i++) {
913 if (!ovsdb_atom_is_default(&datum->keys[i], type->key.type)) {
916 if (type->value.type != OVSDB_TYPE_VOID
917 && !ovsdb_atom_is_default(&datum->values[i], type->value.type)) {
925 static union ovsdb_atom *
926 clone_atoms(const union ovsdb_atom *old, enum ovsdb_atomic_type type, size_t n)
928 if (type != OVSDB_TYPE_VOID && n) {
929 union ovsdb_atom *new;
932 new = xmalloc(n * sizeof *new);
933 for (i = 0; i < n; i++) {
934 ovsdb_atom_clone(&new[i], &old[i], type);
938 /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is
939 * treated as xmalloc(1). */
944 /* Initializes 'new' as a copy of 'old', with the given 'type'.
946 * The caller must eventually arrange for 'new' to be destroyed (with
947 * ovsdb_datum_destroy()). */
949 ovsdb_datum_clone(struct ovsdb_datum *new, const struct ovsdb_datum *old,
950 const struct ovsdb_type *type)
952 unsigned int n = old->n;
954 new->keys = clone_atoms(old->keys, type->key.type, n);
955 new->values = clone_atoms(old->values, type->value.type, n);
959 free_data(enum ovsdb_atomic_type type,
960 union ovsdb_atom *atoms, size_t n_atoms)
962 if (ovsdb_atom_needs_destruction(type)) {
964 for (i = 0; i < n_atoms; i++) {
965 ovsdb_atom_destroy(&atoms[i], type);
971 /* Frees the data owned by 'datum', which must have the given 'type'.
973 * This does not actually call free(datum). If necessary, the caller must be
974 * responsible for that. */
976 ovsdb_datum_destroy(struct ovsdb_datum *datum, const struct ovsdb_type *type)
978 free_data(type->key.type, datum->keys, datum->n);
979 free_data(type->value.type, datum->values, datum->n);
982 /* Swaps the contents of 'a' and 'b', which need not have the same type. */
984 ovsdb_datum_swap(struct ovsdb_datum *a, struct ovsdb_datum *b)
986 struct ovsdb_datum tmp = *a;
991 struct ovsdb_datum_sort_cbdata {
992 enum ovsdb_atomic_type key_type;
993 enum ovsdb_atomic_type value_type;
994 struct ovsdb_datum *datum;
998 ovsdb_datum_sort_compare_cb(size_t a, size_t b, void *cbdata_)
1000 struct ovsdb_datum_sort_cbdata *cbdata = cbdata_;
1003 retval = ovsdb_atom_compare_3way(&cbdata->datum->keys[a],
1004 &cbdata->datum->keys[b],
1006 if (retval || cbdata->value_type == OVSDB_TYPE_VOID) {
1010 return ovsdb_atom_compare_3way(&cbdata->datum->values[a],
1011 &cbdata->datum->values[b],
1012 cbdata->value_type);
1016 ovsdb_datum_sort_swap_cb(size_t a, size_t b, void *cbdata_)
1018 struct ovsdb_datum_sort_cbdata *cbdata = cbdata_;
1020 ovsdb_atom_swap(&cbdata->datum->keys[a], &cbdata->datum->keys[b]);
1021 if (cbdata->datum->values) {
1022 ovsdb_atom_swap(&cbdata->datum->values[a], &cbdata->datum->values[b]);
1027 ovsdb_datum_sort__(struct ovsdb_datum *datum, enum ovsdb_atomic_type key_type,
1028 enum ovsdb_atomic_type value_type)
1030 struct ovsdb_datum_sort_cbdata cbdata;
1032 cbdata.key_type = key_type;
1033 cbdata.value_type = value_type;
1034 cbdata.datum = datum;
1035 sort(datum->n, ovsdb_datum_sort_compare_cb, ovsdb_datum_sort_swap_cb,
1039 /* The keys in an ovsdb_datum must be unique and in sorted order. Most
1040 * functions that modify an ovsdb_datum maintain these invariants. For those
1041 * that don't, this function checks and restores these invariants for 'datum',
1042 * whose keys are of type 'key_type'.
1044 * This function returns NULL if successful, otherwise an error message. The
1045 * caller must free the returned error when it is no longer needed. On error,
1046 * 'datum' is sorted but not unique. */
1047 struct ovsdb_error *
1048 ovsdb_datum_sort(struct ovsdb_datum *datum, enum ovsdb_atomic_type key_type)
1056 ovsdb_datum_sort__(datum, key_type, OVSDB_TYPE_VOID);
1058 for (i = 0; i < datum->n - 1; i++) {
1059 if (ovsdb_atom_equals(&datum->keys[i], &datum->keys[i + 1],
1061 if (datum->values) {
1062 return ovsdb_error(NULL, "map contains duplicate key");
1064 return ovsdb_error(NULL, "set contains duplicate");
1071 /* This function is the same as ovsdb_datum_sort(), except that the caller
1072 * knows that 'datum' is unique. The operation therefore "cannot fail", so
1073 * this function assert-fails if it actually does. */
1075 ovsdb_datum_sort_assert(struct ovsdb_datum *datum,
1076 enum ovsdb_atomic_type key_type)
1078 struct ovsdb_error *error = ovsdb_datum_sort(datum, key_type);
1084 /* This is similar to ovsdb_datum_sort(), except that it drops duplicate keys
1085 * instead of reporting an error. In a map type, the smallest value among a
1086 * group of duplicate pairs is retained and the others are dropped.
1088 * Returns the number of keys (or pairs) that were dropped. */
1090 ovsdb_datum_sort_unique(struct ovsdb_datum *datum,
1091 enum ovsdb_atomic_type key_type,
1092 enum ovsdb_atomic_type value_type)
1100 ovsdb_datum_sort__(datum, key_type, value_type);
1103 for (src = 1; src < datum->n; src++) {
1104 if (ovsdb_atom_equals(&datum->keys[src], &datum->keys[dst - 1],
1106 ovsdb_atom_destroy(&datum->keys[src], key_type);
1107 if (value_type != OVSDB_TYPE_VOID) {
1108 ovsdb_atom_destroy(&datum->values[src], value_type);
1112 datum->keys[dst] = datum->keys[src];
1113 if (value_type != OVSDB_TYPE_VOID) {
1114 datum->values[dst] = datum->values[src];
1121 return datum->n - src;
1124 /* Checks that each of the atoms in 'datum' conforms to the constraints
1125 * specified by its 'type'. Returns an error if a constraint is violated,
1126 * otherwise a null pointer.
1128 * This function is not commonly useful because the most ordinary way to obtain
1129 * a datum is ultimately via ovsdb_atom_from_string() or
1130 * ovsdb_atom_from_json(), which check constraints themselves. */
1131 struct ovsdb_error *
1132 ovsdb_datum_check_constraints(const struct ovsdb_datum *datum,
1133 const struct ovsdb_type *type)
1135 struct ovsdb_error *error;
1138 for (i = 0; i < datum->n; i++) {
1139 error = ovsdb_atom_check_constraints(&datum->keys[i], &type->key);
1145 if (type->value.type != OVSDB_TYPE_VOID) {
1146 for (i = 0; i < datum->n; i++) {
1147 error = ovsdb_atom_check_constraints(&datum->values[i],
1158 static struct ovsdb_error *
1159 ovsdb_datum_from_json__(struct ovsdb_datum *datum,
1160 const struct ovsdb_type *type,
1161 const struct json *json,
1162 struct ovsdb_symbol_table *symtab)
1164 struct ovsdb_error *error;
1166 if (ovsdb_type_is_map(type)
1167 || (json->type == JSON_ARRAY
1168 && json->u.array.n > 0
1169 && json->u.array.elems[0]->type == JSON_STRING
1170 && !strcmp(json->u.array.elems[0]->u.string, "set"))) {
1171 bool is_map = ovsdb_type_is_map(type);
1172 const char *class = is_map ? "map" : "set";
1173 const struct json *inner;
1177 error = unwrap_json(json, class, JSON_ARRAY, &inner);
1182 n = inner->u.array.n;
1183 if (n < type->n_min || n > type->n_max) {
1184 return ovsdb_syntax_error(json, NULL, "%s must have %u to "
1185 "%u members but %"PRIuSIZE" are present",
1186 class, type->n_min, type->n_max, n);
1190 datum->keys = xmalloc(n * sizeof *datum->keys);
1191 datum->values = is_map ? xmalloc(n * sizeof *datum->values) : NULL;
1192 for (i = 0; i < n; i++) {
1193 const struct json *element = inner->u.array.elems[i];
1194 const struct json *key = NULL;
1195 const struct json *value = NULL;
1200 error = parse_json_pair(element, &key, &value);
1206 error = ovsdb_atom_from_json(&datum->keys[i], &type->key,
1213 error = ovsdb_atom_from_json(&datum->values[i],
1214 &type->value, value, symtab);
1216 ovsdb_atom_destroy(&datum->keys[i], type->key.type);
1226 ovsdb_datum_destroy(datum, type);
1230 datum->keys = xmalloc(sizeof *datum->keys);
1231 datum->values = NULL;
1233 error = ovsdb_atom_from_json(&datum->keys[0], &type->key,
1242 /* Parses 'json' as a datum of the type described by 'type'. If successful,
1243 * returns NULL and initializes 'datum' with the parsed datum. On failure,
1244 * returns an error and the contents of 'datum' are indeterminate. The caller
1245 * is responsible for freeing the error or the datum that is returned.
1247 * Violations of constraints expressed by 'type' are treated as errors.
1249 * If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted. Refer to
1250 * RFC 7047 for information about this, and for the syntax that this function
1252 struct ovsdb_error *
1253 ovsdb_datum_from_json(struct ovsdb_datum *datum,
1254 const struct ovsdb_type *type,
1255 const struct json *json,
1256 struct ovsdb_symbol_table *symtab)
1258 struct ovsdb_error *error;
1260 error = ovsdb_datum_from_json__(datum, type, json, symtab);
1265 error = ovsdb_datum_sort(datum, type->key.type);
1267 ovsdb_datum_destroy(datum, type);
1272 /* Parses 'json' as a datum of the type described by 'type' for internal
1273 * use. This function is similar to 'ovsdb_datum_from_json', except the
1274 * member size of set or map is not checked.
1276 * The datum generated should be used then discard. It is not suitable
1277 * for storing into IDL because of the possible member size violation. */
1278 struct ovsdb_error *
1279 ovsdb_transient_datum_from_json(struct ovsdb_datum *datum,
1280 const struct ovsdb_type *type,
1281 const struct json *json)
1283 struct ovsdb_type relaxed_type = *type;
1285 relaxed_type.n_min = 0;
1286 relaxed_type.n_max = UINT_MAX;
1288 return ovsdb_datum_from_json(datum, &relaxed_type, json, NULL);
1291 /* Converts 'datum', of the specified 'type', to JSON format, and returns the
1292 * JSON. The caller is responsible for freeing the returned JSON.
1294 * 'type' constraints on datum->n are ignored.
1296 * Refer to RFC 7047 for the format of the JSON that this function produces. */
1298 ovsdb_datum_to_json(const struct ovsdb_datum *datum,
1299 const struct ovsdb_type *type)
1301 if (ovsdb_type_is_map(type)) {
1302 struct json **elems;
1305 elems = xmalloc(datum->n * sizeof *elems);
1306 for (i = 0; i < datum->n; i++) {
1307 elems[i] = json_array_create_2(
1308 ovsdb_atom_to_json(&datum->keys[i], type->key.type),
1309 ovsdb_atom_to_json(&datum->values[i], type->value.type));
1312 return wrap_json("map", json_array_create(elems, datum->n));
1313 } else if (datum->n == 1) {
1314 return ovsdb_atom_to_json(&datum->keys[0], type->key.type);
1316 struct json **elems;
1319 elems = xmalloc(datum->n * sizeof *elems);
1320 for (i = 0; i < datum->n; i++) {
1321 elems[i] = ovsdb_atom_to_json(&datum->keys[i], type->key.type);
1324 return wrap_json("set", json_array_create(elems, datum->n));
1329 skip_spaces(const char *p)
1331 while (isspace((unsigned char) *p)) {
1338 parse_atom_token(const char **s, const struct ovsdb_base_type *base,
1339 union ovsdb_atom *atom, struct ovsdb_symbol_table *symtab)
1341 char *token, *error;
1343 error = ovsdb_token_parse(s, &token);
1345 error = ovsdb_atom_from_string(atom, base, token, symtab);
1352 parse_key_value(const char **s, const struct ovsdb_type *type,
1353 union ovsdb_atom *key, union ovsdb_atom *value,
1354 struct ovsdb_symbol_table *symtab)
1356 const char *start = *s;
1359 error = parse_atom_token(s, &type->key, key, symtab);
1360 if (!error && type->value.type != OVSDB_TYPE_VOID) {
1361 *s = skip_spaces(*s);
1364 *s = skip_spaces(*s);
1365 error = parse_atom_token(s, &type->value, value, symtab);
1367 error = xasprintf("%s: syntax error at \"%c\" expecting \"=\"",
1371 ovsdb_atom_destroy(key, type->key.type);
1378 free_key_value(const struct ovsdb_type *type,
1379 union ovsdb_atom *key, union ovsdb_atom *value)
1381 ovsdb_atom_destroy(key, type->key.type);
1382 if (type->value.type != OVSDB_TYPE_VOID) {
1383 ovsdb_atom_destroy(value, type->value.type);
1387 /* Initializes 'datum' as a datum of the given 'type', parsing its contents
1388 * from 's'. The format of 's' is a series of space or comma separated atoms
1389 * or, for a map, '='-delimited pairs of atoms. Each atom must in a format
1390 * acceptable to ovsdb_atom_from_string(). Optionally, a set may be enclosed
1391 * in "[]" or a map in "{}"; for an empty set or map these punctuators are
1394 * Optionally, a symbol table may be supplied as 'symtab'. It is passed to
1395 * ovsdb_atom_to_string(). */
1397 ovsdb_datum_from_string(struct ovsdb_datum *datum,
1398 const struct ovsdb_type *type, const char *s,
1399 struct ovsdb_symbol_table *symtab)
1401 bool is_map = ovsdb_type_is_map(type);
1402 struct ovsdb_error *dberror;
1407 ovsdb_datum_init_empty(datum);
1409 /* Swallow a leading delimiter if there is one. */
1411 if (*p == (is_map ? '{' : '[')) {
1412 end_delim = is_map ? '}' : ']';
1413 p = skip_spaces(p + 1);
1416 return xstrdup("use \"{}\" to specify the empty map");
1418 return xstrdup("use \"[]\" to specify the empty set");
1424 while (*p && *p != end_delim) {
1425 union ovsdb_atom key, value;
1427 if (ovsdb_token_is_delim(*p)) {
1428 char *type_str = ovsdb_type_to_english(type);
1429 error = xasprintf("%s: unexpected \"%c\" parsing %s",
1436 error = parse_key_value(&p, type, &key, &value, symtab);
1440 ovsdb_datum_add_unsafe(datum, &key, &value, type);
1441 free_key_value(type, &key, &value);
1443 /* Skip optional white space and comma. */
1446 p = skip_spaces(p + 1);
1450 if (*p != end_delim) {
1451 error = xasprintf("%s: missing \"%c\" at end of data", s, end_delim);
1455 p = skip_spaces(p + 1);
1457 error = xasprintf("%s: trailing garbage after \"%c\"",
1463 if (datum->n < type->n_min) {
1464 error = xasprintf("%s: %u %s specified but the minimum number is %u",
1465 s, datum->n, is_map ? "pair(s)" : "value(s)",
1468 } else if (datum->n > type->n_max) {
1469 error = xasprintf("%s: %u %s specified but the maximum number is %u",
1470 s, datum->n, is_map ? "pair(s)" : "value(s)",
1475 dberror = ovsdb_datum_sort(datum, type->key.type);
1477 ovsdb_error_destroy(dberror);
1478 if (ovsdb_type_is_map(type)) {
1479 error = xasprintf("%s: map contains duplicate key", s);
1481 error = xasprintf("%s: set contains duplicate value", s);
1489 ovsdb_datum_destroy(datum, type);
1490 ovsdb_datum_init_empty(datum);
1494 /* Appends to 'out' the 'datum' (with the given 'type') in a format acceptable
1495 * to ovsdb_datum_from_string(). */
1497 ovsdb_datum_to_string(const struct ovsdb_datum *datum,
1498 const struct ovsdb_type *type, struct ds *out)
1500 bool is_map = ovsdb_type_is_map(type);
1503 if (type->n_max > 1 || !datum->n) {
1504 ds_put_char(out, is_map ? '{' : '[');
1506 for (i = 0; i < datum->n; i++) {
1508 ds_put_cstr(out, ", ");
1511 ovsdb_atom_to_string(&datum->keys[i], type->key.type, out);
1513 ds_put_char(out, '=');
1514 ovsdb_atom_to_string(&datum->values[i], type->value.type, out);
1517 if (type->n_max > 1 || !datum->n) {
1518 ds_put_char(out, is_map ? '}' : ']');
1522 /* Appends to 'out' the 'datum' (with the given 'type') in a bare string format
1523 * that cannot be parsed uniformly back into a datum but is easier for shell
1524 * scripts, etc., to deal with. */
1526 ovsdb_datum_to_bare(const struct ovsdb_datum *datum,
1527 const struct ovsdb_type *type, struct ds *out)
1529 bool is_map = ovsdb_type_is_map(type);
1532 for (i = 0; i < datum->n; i++) {
1534 ds_put_cstr(out, " ");
1537 ovsdb_atom_to_bare(&datum->keys[i], type->key.type, out);
1539 ds_put_char(out, '=');
1540 ovsdb_atom_to_bare(&datum->values[i], type->value.type, out);
1545 /* Initializes 'datum' as a string-to-string map whose contents are taken from
1546 * 'smap'. Destroys 'smap'. */
1548 ovsdb_datum_from_smap(struct ovsdb_datum *datum, struct smap *smap)
1550 struct smap_node *node, *next;
1553 datum->n = smap_count(smap);
1554 datum->keys = xmalloc(datum->n * sizeof *datum->keys);
1555 datum->values = xmalloc(datum->n * sizeof *datum->values);
1558 SMAP_FOR_EACH_SAFE (node, next, smap) {
1559 smap_steal(smap, node,
1560 &datum->keys[i].string, &datum->values[i].string);
1563 ovs_assert(i == datum->n);
1566 ovsdb_datum_sort_unique(datum, OVSDB_TYPE_STRING, OVSDB_TYPE_STRING);
1570 hash_atoms(enum ovsdb_atomic_type type, const union ovsdb_atom *atoms,
1571 unsigned int n, uint32_t basis)
1573 if (type != OVSDB_TYPE_VOID) {
1576 for (i = 0; i < n; i++) {
1577 basis = ovsdb_atom_hash(&atoms[i], type, basis);
1584 ovsdb_datum_hash(const struct ovsdb_datum *datum,
1585 const struct ovsdb_type *type, uint32_t basis)
1587 basis = hash_atoms(type->key.type, datum->keys, datum->n, basis);
1588 basis ^= (type->key.type << 24) | (type->value.type << 16) | datum->n;
1589 basis = hash_atoms(type->value.type, datum->values, datum->n, basis);
1594 atom_arrays_compare_3way(const union ovsdb_atom *a,
1595 const union ovsdb_atom *b,
1596 enum ovsdb_atomic_type type,
1601 for (i = 0; i < n; i++) {
1602 int cmp = ovsdb_atom_compare_3way(&a[i], &b[i], type);
1612 ovsdb_datum_equals(const struct ovsdb_datum *a,
1613 const struct ovsdb_datum *b,
1614 const struct ovsdb_type *type)
1616 return !ovsdb_datum_compare_3way(a, b, type);
1620 ovsdb_datum_compare_3way(const struct ovsdb_datum *a,
1621 const struct ovsdb_datum *b,
1622 const struct ovsdb_type *type)
1627 return a->n < b->n ? -1 : 1;
1630 cmp = atom_arrays_compare_3way(a->keys, b->keys, type->key.type, a->n);
1635 return (type->value.type == OVSDB_TYPE_VOID ? 0
1636 : atom_arrays_compare_3way(a->values, b->values, type->value.type,
1640 /* If 'key' is one of the keys in 'datum', returns its index within 'datum',
1641 * otherwise UINT_MAX. 'key.type' must be the type of the atoms stored in the
1642 * 'keys' array in 'datum'.
1645 ovsdb_datum_find_key(const struct ovsdb_datum *datum,
1646 const union ovsdb_atom *key,
1647 enum ovsdb_atomic_type key_type)
1649 unsigned int low = 0;
1650 unsigned int high = datum->n;
1651 while (low < high) {
1652 unsigned int idx = (low + high) / 2;
1653 int cmp = ovsdb_atom_compare_3way(key, &datum->keys[idx], key_type);
1656 } else if (cmp > 0) {
1665 /* If 'key' and 'value' is one of the key-value pairs in 'datum', returns its
1666 * index within 'datum', otherwise UINT_MAX. 'key.type' must be the type of
1667 * the atoms stored in the 'keys' array in 'datum'. 'value_type' may be the
1668 * type of the 'values' atoms or OVSDB_TYPE_VOID to compare only keys.
1671 ovsdb_datum_find_key_value(const struct ovsdb_datum *datum,
1672 const union ovsdb_atom *key,
1673 enum ovsdb_atomic_type key_type,
1674 const union ovsdb_atom *value,
1675 enum ovsdb_atomic_type value_type)
1677 unsigned int idx = ovsdb_datum_find_key(datum, key, key_type);
1679 && value_type != OVSDB_TYPE_VOID
1680 && !ovsdb_atom_equals(&datum->values[idx], value, value_type)) {
1686 /* If atom 'i' in 'a' is also in 'b', returns its index in 'b', otherwise
1687 * UINT_MAX. 'type' must be the type of 'a' and 'b', except that
1688 * type->value.type may be set to OVSDB_TYPE_VOID to compare keys but not
1691 ovsdb_datum_find(const struct ovsdb_datum *a, int i,
1692 const struct ovsdb_datum *b,
1693 const struct ovsdb_type *type)
1695 return ovsdb_datum_find_key_value(b,
1696 &a->keys[i], type->key.type,
1697 a->values ? &a->values[i] : NULL,
1701 /* Returns true if every element in 'a' is also in 'b', false otherwise. */
1703 ovsdb_datum_includes_all(const struct ovsdb_datum *a,
1704 const struct ovsdb_datum *b,
1705 const struct ovsdb_type *type)
1712 for (i = 0; i < a->n; i++) {
1713 if (ovsdb_datum_find(a, i, b, type) == UINT_MAX) {
1720 /* Returns true if no element in 'a' is also in 'b', false otherwise. */
1722 ovsdb_datum_excludes_all(const struct ovsdb_datum *a,
1723 const struct ovsdb_datum *b,
1724 const struct ovsdb_type *type)
1728 for (i = 0; i < a->n; i++) {
1729 if (ovsdb_datum_find(a, i, b, type) != UINT_MAX) {
1737 ovsdb_datum_reallocate(struct ovsdb_datum *a, const struct ovsdb_type *type,
1738 unsigned int capacity)
1740 a->keys = xrealloc(a->keys, capacity * sizeof *a->keys);
1741 if (type->value.type != OVSDB_TYPE_VOID) {
1742 a->values = xrealloc(a->values, capacity * sizeof *a->values);
1746 /* Removes the element with index 'idx' from 'datum', which has type 'type'.
1747 * If 'idx' is not the last element in 'datum', then the removed element is
1748 * replaced by the (former) last element.
1750 * This function does not maintain ovsdb_datum invariants. Use
1751 * ovsdb_datum_sort() to check and restore these invariants. */
1753 ovsdb_datum_remove_unsafe(struct ovsdb_datum *datum, size_t idx,
1754 const struct ovsdb_type *type)
1756 ovsdb_atom_destroy(&datum->keys[idx], type->key.type);
1757 datum->keys[idx] = datum->keys[datum->n - 1];
1758 if (type->value.type != OVSDB_TYPE_VOID) {
1759 ovsdb_atom_destroy(&datum->values[idx], type->value.type);
1760 datum->values[idx] = datum->values[datum->n - 1];
1765 /* Adds the element with the given 'key' and 'value' to 'datum', which must
1766 * have the specified 'type'.
1768 * This function always allocates memory, so it is not an efficient way to add
1769 * a number of elements to a datum.
1771 * This function does not maintain ovsdb_datum invariants. Use
1772 * ovsdb_datum_sort() to check and restore these invariants. (But a datum with
1773 * 0 or 1 elements cannot violate the invariants anyhow.) */
1775 ovsdb_datum_add_unsafe(struct ovsdb_datum *datum,
1776 const union ovsdb_atom *key,
1777 const union ovsdb_atom *value,
1778 const struct ovsdb_type *type)
1780 size_t idx = datum->n++;
1781 datum->keys = xrealloc(datum->keys, datum->n * sizeof *datum->keys);
1782 ovsdb_atom_clone(&datum->keys[idx], key, type->key.type);
1783 if (type->value.type != OVSDB_TYPE_VOID) {
1784 datum->values = xrealloc(datum->values,
1785 datum->n * sizeof *datum->values);
1786 ovsdb_atom_clone(&datum->values[idx], value, type->value.type);
1791 ovsdb_datum_union(struct ovsdb_datum *a, const struct ovsdb_datum *b,
1792 const struct ovsdb_type *type, bool replace)
1798 for (bi = 0; bi < b->n; bi++) {
1801 ai = ovsdb_datum_find_key(a, &b->keys[bi], type->key.type);
1802 if (ai == UINT_MAX) {
1804 ovsdb_datum_reallocate(a, type, a->n + (b->n - bi));
1806 ovsdb_atom_clone(&a->keys[n], &b->keys[bi], type->key.type);
1807 if (type->value.type != OVSDB_TYPE_VOID) {
1808 ovsdb_atom_clone(&a->values[n], &b->values[bi],
1812 } else if (replace && type->value.type != OVSDB_TYPE_VOID) {
1813 ovsdb_atom_destroy(&a->values[ai], type->value.type);
1814 ovsdb_atom_clone(&a->values[ai], &b->values[bi],
1819 struct ovsdb_error *error;
1821 error = ovsdb_datum_sort(a, type->key.type);
1827 ovsdb_datum_subtract(struct ovsdb_datum *a, const struct ovsdb_type *a_type,
1828 const struct ovsdb_datum *b,
1829 const struct ovsdb_type *b_type)
1831 bool changed = false;
1834 ovs_assert(a_type->key.type == b_type->key.type);
1835 ovs_assert(a_type->value.type == b_type->value.type
1836 || b_type->value.type == OVSDB_TYPE_VOID);
1838 /* XXX The big-O of this could easily be improved. */
1839 for (i = 0; i < a->n; ) {
1840 unsigned int idx = ovsdb_datum_find(a, i, b, b_type);
1841 if (idx != UINT_MAX) {
1843 ovsdb_datum_remove_unsafe(a, i, a_type);
1849 ovsdb_datum_sort_assert(a, a_type->key.type);
1853 struct ovsdb_symbol_table *
1854 ovsdb_symbol_table_create(void)
1856 struct ovsdb_symbol_table *symtab = xmalloc(sizeof *symtab);
1857 shash_init(&symtab->sh);
1862 ovsdb_symbol_table_destroy(struct ovsdb_symbol_table *symtab)
1865 shash_destroy_free_data(&symtab->sh);
1870 struct ovsdb_symbol *
1871 ovsdb_symbol_table_get(const struct ovsdb_symbol_table *symtab,
1874 return shash_find_data(&symtab->sh, name);
1877 struct ovsdb_symbol *
1878 ovsdb_symbol_table_put(struct ovsdb_symbol_table *symtab, const char *name,
1879 const struct uuid *uuid, bool created)
1881 struct ovsdb_symbol *symbol;
1883 ovs_assert(!ovsdb_symbol_table_get(symtab, name));
1884 symbol = xmalloc(sizeof *symbol);
1885 symbol->uuid = *uuid;
1886 symbol->created = created;
1887 symbol->strong_ref = false;
1888 symbol->weak_ref = false;
1889 shash_add(&symtab->sh, name, symbol);
1893 struct ovsdb_symbol *
1894 ovsdb_symbol_table_insert(struct ovsdb_symbol_table *symtab,
1897 struct ovsdb_symbol *symbol;
1899 symbol = ovsdb_symbol_table_get(symtab, name);
1903 uuid_generate(&uuid);
1904 symbol = ovsdb_symbol_table_put(symtab, name, &uuid, false);
1909 /* APIs for Generating and apply diffs. */
1911 /* Generate a difference ovsdb_dataum between 'old' and 'new'.
1912 * 'new' can be regenerated by applying the difference to the 'old'.
1914 * The diff operation is reversible. Given 'old',
1915 * 'new' can be recreated by applying diff to 'old'.
1918 * Let d = 'old' diff 'new'
1919 * then 'new' = 'old' diff d
1921 * The 'diff' datum is always safe; the orders of keys are maintained
1922 * since they are added in order. */
1924 ovsdb_datum_diff(struct ovsdb_datum *diff,
1925 const struct ovsdb_datum *old,
1926 const struct ovsdb_datum *new,
1927 const struct ovsdb_type *type)
1931 ovsdb_datum_init_empty(diff);
1932 if (!ovsdb_type_is_composite(type)) {
1933 ovsdb_datum_clone(diff, new, type);
1937 /* Generate the diff in O(n) time. */
1938 for (oi = ni = 0; oi < old->n && ni < new->n; ) {
1939 int c = ovsdb_atom_compare_3way(&old->keys[oi], &new->keys[ni],
1942 ovsdb_datum_add_unsafe(diff, &old->keys[oi], &old->values[oi],
1946 ovsdb_datum_add_unsafe(diff, &new->keys[ni], &new->values[ni],
1950 if (type->value.type != OVSDB_TYPE_VOID &&
1951 ovsdb_atom_compare_3way(&old->values[oi], &new->values[ni],
1952 type->value.type)) {
1953 ovsdb_datum_add_unsafe(diff, &new->keys[ni], &new->values[ni],
1960 for (; oi < old->n; oi++) {
1961 ovsdb_datum_add_unsafe(diff, &old->keys[oi], &old->values[oi], type);
1964 for (; ni < new->n; ni++) {
1965 ovsdb_datum_add_unsafe(diff, &new->keys[ni], &new->values[ni], type);
1969 /* Apply 'diff' to 'old' to regenerate 'new'.
1971 * Return NULL if the 'new' is successfully generated, otherwise, return
1972 * ovsdb_error and the stat of 'new' is indeterministic. */
1973 struct ovsdb_error *
1974 ovsdb_datum_apply_diff(struct ovsdb_datum *new,
1975 const struct ovsdb_datum *old,
1976 const struct ovsdb_datum *diff,
1977 const struct ovsdb_type *type)
1979 ovsdb_datum_init_empty(new);
1980 ovsdb_datum_diff(new, old, diff, type);
1982 /* Make sure member size of 'new' conforms to type. */
1983 if (new->n < type->n_min || new->n > type->n_max) {
1984 ovsdb_datum_destroy(new, type);
1985 return ovsdb_error(NULL, "Datum crated by diff has size error");
1992 /* Extracts a token from the beginning of 's' and returns a pointer just after
1993 * the token. Stores the token itself into '*outp', which the caller is
1994 * responsible for freeing (with free()).
1996 * If 's[0]' is a delimiter, the returned token is the empty string.
1998 * A token extends from 's' to the first delimiter, as defined by
1999 * ovsdb_token_is_delim(), or until the end of the string. A delimiter can be
2000 * escaped with a backslash, in which case the backslash does not appear in the
2001 * output. Double quotes also cause delimiters to be ignored, but the double
2002 * quotes are retained in the output. (Backslashes inside double quotes are
2003 * not removed, either.)
2006 ovsdb_token_parse(const char **s, char **outp)
2015 for (p = *s; *p != '\0'; ) {
2019 ds_put_char(&out, '\\');
2022 error = xasprintf("%s: backslash at end of argument", *s);
2025 ds_put_char(&out, *p++);
2026 } else if (!in_quotes && ovsdb_token_is_delim(c)) {
2030 ds_put_char(&out, c);
2032 in_quotes = !in_quotes;
2037 error = xasprintf("%s: quoted string extends past end of argument",
2041 *outp = ds_cstr(&out);
2051 /* Returns true if 'c' delimits tokens, or if 'c' is 0, and false otherwise. */
2053 ovsdb_token_is_delim(unsigned char c)
2055 return strchr(":=, []{}!<>", c) != NULL;