1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/**
* @file tree_data_hash.c
* @author Radek Krejci <rkrejci@cesnet.cz>
* @brief Functions to manipulate with the data node's hashes.
*
* Copyright (c) 2019 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "compat.h"
#include "hash_table.h"
#include "log.h"
#include "ly_common.h"
#include "plugins_types.h"
#include "tree.h"
#include "tree_data.h"
#include "tree_schema.h"
LY_ERR
lyd_hash(struct lyd_node *node)
{
struct lyd_node *iter;
const void *hash_key;
ly_bool dyn;
size_t key_len;
if (!node->schema) {
return LY_SUCCESS;
}
/* hash always starts with the module and schema name */
node->hash = lyht_hash_multi(0, node->schema->module->name, strlen(node->schema->module->name));
node->hash = lyht_hash_multi(node->hash, node->schema->name, strlen(node->schema->name));
if (node->schema->nodetype == LYS_LIST) {
if (node->schema->flags & LYS_KEYLESS) {
/* key-less list simply calls hash function again with empty key,
* just so that it differs from the first-instance hash
*/
node->hash = lyht_hash_multi(node->hash, NULL, 0);
} else {
struct lyd_node_inner *list = (struct lyd_node_inner *)node;
/* list hash is made up from its keys */
for (iter = list->child; iter && iter->schema && (iter->schema->flags & LYS_KEY); iter = iter->next) {
struct lyd_node_term *key = (struct lyd_node_term *)iter;
hash_key = key->value.realtype->plugin->print(NULL, &key->value, LY_VALUE_LYB, NULL, &dyn, &key_len);
node->hash = lyht_hash_multi(node->hash, hash_key, key_len);
if (dyn) {
free((void *)hash_key);
}
}
}
} else if (node->schema->nodetype == LYS_LEAFLIST) {
/* leaf-list adds its hash key */
struct lyd_node_term *llist = (struct lyd_node_term *)node;
hash_key = llist->value.realtype->plugin->print(NULL, &llist->value, LY_VALUE_LYB, NULL, &dyn, &key_len);
node->hash = lyht_hash_multi(node->hash, hash_key, key_len);
if (dyn) {
free((void *)hash_key);
}
}
/* finish the hash */
node->hash = lyht_hash_multi(node->hash, NULL, 0);
return LY_SUCCESS;
}
/**
* @brief Compare callback for values in hash table.
*
* Implementation of ::lyht_value_equal_cb.
*/
static ly_bool
lyd_hash_table_val_equal(void *val1_p, void *val2_p, ly_bool mod, void *UNUSED(cb_data))
{
struct lyd_node *val1, *val2;
val1 = *((struct lyd_node **)val1_p);
val2 = *((struct lyd_node **)val2_p);
if (mod) {
if (val1 == val2) {
return 1;
} else {
return 0;
}
}
if (val1->schema->nodetype & (LYS_LIST | LYS_LEAFLIST)) {
/* match on exact instance */
if (!lyd_compare_single(val1, val2, 0)) {
return 1;
}
} else if (val1->schema == val2->schema) {
/* just schema match */
return 1;
}
return 0;
}
/**
* @brief Add single node into children hash table.
*
* @param[in] ht Children hash table.
* @param[in] node Node to insert.
* @param[in] empty_ht Whether we started with an empty HT meaning no nodes were inserted yet.
* @return LY_ERR value.
*/
static LY_ERR
lyd_insert_hash_add(struct ly_ht *ht, struct lyd_node *node, ly_bool empty_ht)
{
uint32_t hash;
assert(ht && node && node->schema);
/* add node itself */
if (lyht_insert_no_check(ht, &node, node->hash, NULL)) {
LOGINT_RET(LYD_CTX(node));
}
/* add first instance of a (leaf-)list */
if ((node->schema->nodetype & (LYS_LIST | LYS_LEAFLIST)) &&
(!node->prev->next || (node->prev->schema != node->schema))) {
/* get the simple hash */
hash = lyht_hash_multi(0, node->schema->module->name, strlen(node->schema->module->name));
hash = lyht_hash_multi(hash, node->schema->name, strlen(node->schema->name));
hash = lyht_hash_multi(hash, NULL, 0);
/* remove any previous stored instance, only if we did not start with an empty HT */
if (!empty_ht && node->next && (node->next->schema == node->schema)) {
if (lyht_remove(ht, &node->next, hash)) {
LOGINT_RET(LYD_CTX(node));
}
}
/* in this case there would be the exact same value twice in the hash table, not supported (by the HT) */
assert(hash != node->hash);
/* insert this instance as the first (leaf-)list instance */
if (lyht_insert(ht, &node, hash, NULL)) {
LOGINT_RET(LYD_CTX(node));
}
}
return LY_SUCCESS;
}
LY_ERR
lyd_insert_hash(struct lyd_node *node)
{
struct lyd_node *iter;
uint32_t u;
if (!node->parent || !node->schema || !node->parent->schema) {
/* nothing to do */
return LY_SUCCESS;
}
/* create parent hash table if required, otherwise just add the new child */
if (!node->parent->children_ht) {
/* the hash table is created only when the number of children in a node exceeds the
* defined minimal limit LYD_HT_MIN_ITEMS
*/
u = 0;
LY_LIST_FOR(node->parent->child, iter) {
if (iter->schema) {
++u;
}
}
if (u >= LYD_HT_MIN_ITEMS) {
node->parent->children_ht = lyht_new(lyht_get_fixed_size(u), sizeof(struct lyd_node *), lyd_hash_table_val_equal, NULL, 1);
LY_LIST_FOR(node->parent->child, iter) {
if (iter->schema) {
LY_CHECK_RET(lyd_insert_hash_add(node->parent->children_ht, iter, 1));
}
}
}
} else {
LY_CHECK_RET(lyd_insert_hash_add(node->parent->children_ht, node, 0));
}
return LY_SUCCESS;
}
void
lyd_unlink_hash(struct lyd_node *node)
{
uint32_t hash;
if (!node->parent || !node->schema || !node->parent->schema || !node->parent->children_ht) {
/* not in any HT */
return;
}
/* remove from the parent HT */
if (lyht_remove(node->parent->children_ht, &node, node->hash)) {
LOGINT(LYD_CTX(node));
return;
}
/* first instance of the (leaf-)list, needs to be removed from HT */
if ((node->schema->nodetype & (LYS_LIST | LYS_LEAFLIST)) && (!node->prev->next || (node->prev->schema != node->schema))) {
/* get the simple hash */
hash = lyht_hash_multi(0, node->schema->module->name, strlen(node->schema->module->name));
hash = lyht_hash_multi(hash, node->schema->name, strlen(node->schema->name));
hash = lyht_hash_multi(hash, NULL, 0);
/* remove the instance */
if (lyht_remove(node->parent->children_ht, &node, hash)) {
LOGINT(LYD_CTX(node));
return;
}
/* add the next instance */
if (node->next && (node->next->schema == node->schema)) {
if (lyht_insert(node->parent->children_ht, &node->next, hash, NULL)) {
LOGINT(LYD_CTX(node));
return;
}
}
}
}
|
