ovsdb/ovsdb.c

   1 /* Copyright (c) 2009, 2010 Nicira Networks
   2  *
   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:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   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.
  14  */
  15
  16 #include <config.h>
  17
  18 #include "ovsdb.h"
  19
  20 #include "json.h"
  21 #include "ovsdb-error.h"
  22 #include "ovsdb-parser.h"
  23 #include "table.h"
  24 #include "transaction.h"
  25
  26 struct ovsdb_schema *
  27 ovsdb_schema_create(const char *name, const char *comment)
  28 {
  29     struct ovsdb_schema *schema;
  30
  31     schema = xzalloc(sizeof *schema);
  32     schema->name = xstrdup(name);
  33     schema->comment = comment ? xstrdup(comment) : NULL;
  34     shash_init(&schema->tables);
  35
  36     return schema;
  37 }
  38
  39 void
  40 ovsdb_schema_destroy(struct ovsdb_schema *schema)
  41 {
  42     struct shash_node *node;
  43
  44     SHASH_FOR_EACH (node, &schema->tables) {
  45         ovsdb_table_schema_destroy(node->data);
  46     }
  47     shash_destroy(&schema->tables);
  48     free(schema->comment);
  49     free(schema->name);
  50     free(schema);
  51 }
  52
  53 struct ovsdb_error *
  54 ovsdb_schema_from_file(const char *file_name, struct ovsdb_schema **schemap)
  55 {
  56     struct ovsdb_schema *schema;
  57     struct ovsdb_error *error;
  58     struct json *json;
  59
  60     *schemap = NULL;
  61     json = json_from_file(file_name);
  62     if (json->type == JSON_STRING) {
  63         error = ovsdb_error("failed to read schema",
  64                            "\"%s\" could not be read as JSON (%s)",
  65                            file_name, json_string(json));
  66         json_destroy(json);
  67         return error;
  68     }
  69
  70     error = ovsdb_schema_from_json(json, &schema);
  71     json_destroy(json);
  72     if (error) {
  73         return ovsdb_wrap_error(error,
  74                                 "failed to parse \"%s\" as ovsdb schema",
  75                                 file_name);
  76     }
  77
  78     *schemap = schema;
  79     return NULL;
  80 }
  81
  82 struct ovsdb_error *
  83 ovsdb_schema_from_json(struct json *json, struct ovsdb_schema **schemap)
  84 {
  85     struct ovsdb_schema *schema;
  86     const struct json *name, *comment, *tables;
  87     struct ovsdb_error *error;
  88     struct shash_node *node;
  89     struct ovsdb_parser parser;
  90
  91     *schemap = NULL;
  92
  93     ovsdb_parser_init(&parser, json, "database schema");
  94     name = ovsdb_parser_member(&parser, "name", OP_ID);
  95     comment = ovsdb_parser_member(&parser, "comment", OP_STRING | OP_OPTIONAL);
  96     tables = ovsdb_parser_member(&parser, "tables", OP_OBJECT);
  97     error = ovsdb_parser_finish(&parser);
  98     if (error) {
  99         return error;
 100     }
 101
 102     schema = ovsdb_schema_create(json_string(name),
 103                                  comment ? json_string(comment) : NULL);
 104     SHASH_FOR_EACH (node, json_object(tables)) {
 105         struct ovsdb_table_schema *table;
 106
 107         if (node->name[0] == '_') {
 108             error = ovsdb_syntax_error(json, NULL, "names beginning with "
 109                                        "\"_\" are reserved");
 110         } else if (!ovsdb_parser_is_id(node->name)) {
 111             error = ovsdb_syntax_error(json, NULL, "name must be a valid id");
 112         } else {
 113             error = ovsdb_table_schema_from_json(node->data, node->name,
 114                                                  &table);
 115         }
 116         if (error) {
 117             ovsdb_schema_destroy(schema);
 118             return error;
 119         }
 120
 121         shash_add(&schema->tables, table->name, table);
 122     }
 123     *schemap = schema;
 124     return 0;
 125 }
 126
 127 struct json *
 128 ovsdb_schema_to_json(const struct ovsdb_schema *schema)
 129 {
 130     struct json *json, *tables;
 131     struct shash_node *node;
 132
 133     json = json_object_create();
 134     json_object_put_string(json, "name", schema->name);
 135     if (schema->comment) {
 136         json_object_put_string(json, "comment", schema->comment);
 137     }
 138
 139     tables = json_object_create();
 140
 141     SHASH_FOR_EACH (node, &schema->tables) {
 142         struct ovsdb_table_schema *table = node->data;
 143         json_object_put(tables, table->name,
 144                         ovsdb_table_schema_to_json(table));
 145     }
 146     json_object_put(json, "tables", tables);
 147
 148     return json;
 149 }
 150 \f
 151 struct ovsdb *
 152 ovsdb_create(struct ovsdb_schema *schema)
 153 {
 154     struct shash_node *node;
 155     struct ovsdb *db;
 156
 157     db = xmalloc(sizeof *db);
 158     db->schema = schema;
 159     list_init(&db->replicas);
 160     list_init(&db->triggers);
 161     db->run_triggers = false;
 162
 163     shash_init(&db->tables);
 164     SHASH_FOR_EACH (node, &schema->tables) {
 165         struct ovsdb_table_schema *ts = node->data;
 166         shash_add(&db->tables, node->name, ovsdb_table_create(ts));
 167     }
 168
 169     return db;
 170 }
 171
 172 void
 173 ovsdb_destroy(struct ovsdb *db)
 174 {
 175     if (db) {
 176         struct shash_node *node;
 177
 178         /* Remove all the replicas. */
 179         while (!list_is_empty(&db->replicas)) {
 180             struct ovsdb_replica *r
 181                 = CONTAINER_OF(list_pop_back(&db->replicas),
 182                                struct ovsdb_replica, node);
 183             ovsdb_remove_replica(db, r);
 184         }
 185
 186         /* Delete all the tables.  This also deletes their schemas. */
 187         SHASH_FOR_EACH (node, &db->tables) {
 188             struct ovsdb_table *table = node->data;
 189             ovsdb_table_destroy(table);
 190         }
 191         shash_destroy(&db->tables);
 192
 193         /* The schemas, but not the table that points to them, were deleted in
 194          * the previous step, so we need to clear out the table.  We can't
 195          * destroy the table, because ovsdb_schema_destroy() will do that. */
 196         shash_clear(&db->schema->tables);
 197
 198         ovsdb_schema_destroy(db->schema);
 199         free(db);
 200     }
 201 }
 202
 203 struct ovsdb_table *
 204 ovsdb_get_table(const struct ovsdb *db, const char *name)
 205 {
 206     return shash_find_data(&db->tables, name);
 207 }
 208 \f
 209 void
 210 ovsdb_replica_init(struct ovsdb_replica *r,
 211                    const struct ovsdb_replica_class *class)
 212 {
 213     r->class = class;
 214 }
 215
 216 void
 217 ovsdb_add_replica(struct ovsdb *db, struct ovsdb_replica *r)
 218 {
 219     list_push_back(&db->replicas, &r->node);
 220 }
 221
 222 void
 223 ovsdb_remove_replica(struct ovsdb *db UNUSED, struct ovsdb_replica *r)
 224 {
 225     list_remove(&r->node);
 226     (r->class->destroy)(r);
 227 }