raft: Avoid sending equal snapshots.

[mirror_ovs.git] / ovsdb / ovsdb.h

/* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2017 Nicira, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef OVSDB_OVSDB_H
#define OVSDB_OVSDB_H 1

#include "compiler.h"
#include "openvswitch/hmap.h"
#include "openvswitch/list.h"
#include "openvswitch/shash.h"
#include "openvswitch/uuid.h"

struct json;
struct ovsdb_log;
struct ovsdb_session;
struct ovsdb_txn;
struct simap;

/* Database schema. */
struct ovsdb_schema {
    char *name;
    char *version;
    char *cksum;
    struct shash tables;        /* Contains "struct ovsdb_table_schema *"s. */
};

struct ovsdb_schema *ovsdb_schema_create(const char *name,
                                         const char *version,
                                         const char *cksum);
struct ovsdb_schema *ovsdb_schema_clone(const struct ovsdb_schema *);
void ovsdb_schema_destroy(struct ovsdb_schema *);

struct ovsdb_error *ovsdb_schema_from_file(const char *file_name,
                                           struct ovsdb_schema **)
    OVS_WARN_UNUSED_RESULT;
struct ovsdb_error *ovsdb_schema_from_json(const struct json *,
                                           struct ovsdb_schema **)
    OVS_WARN_UNUSED_RESULT;
struct json *ovsdb_schema_to_json(const struct ovsdb_schema *);

bool ovsdb_schema_equal(const struct ovsdb_schema *,
                        const struct ovsdb_schema *);

struct ovsdb_error *ovsdb_schema_check_for_ephemeral_columns(
    const struct ovsdb_schema *) OVS_WARN_UNUSED_RESULT;
void ovsdb_schema_persist_ephemeral_columns(struct ovsdb_schema *,
                                            const char *filename);

struct ovsdb_version {
    unsigned int x;
    unsigned int y;
    unsigned int z;
};
bool ovsdb_parse_version(const char *, struct ovsdb_version *);
bool ovsdb_is_valid_version(const char *);
\f
/* Database. */
struct ovsdb_txn_history_node {
    struct ovs_list node; /* Element in struct ovsdb's txn_history list */
    struct ovsdb_txn *txn;
};

struct ovsdb {
    char *name;
    struct ovsdb_schema *schema;
    struct ovsdb_storage *storage; /* If nonnull, log for transactions. */
    struct uuid prereq;
    struct ovs_list monitors;   /* Contains "struct ovsdb_monitor"s. */
    struct shash tables;        /* Contains "struct ovsdb_table *"s. */

    /* Triggers. */
    struct ovs_list triggers;   /* Contains "struct ovsdb_trigger"s. */
    bool run_triggers;
    bool run_triggers_now;

    struct ovsdb_table *rbac_role;

    /* History trasanctions for incremental monitor transfer. */
    bool need_txn_history;     /* Need to maintain history of transactions. */
    unsigned int n_txn_history; /* Current number of history transactions. */
    struct ovs_list txn_history; /* Contains "struct ovsdb_txn_history_node. */
};

struct ovsdb *ovsdb_create(struct ovsdb_schema *, struct ovsdb_storage *);
void ovsdb_destroy(struct ovsdb *);

void ovsdb_get_memory_usage(const struct ovsdb *, struct simap *usage);

struct ovsdb_table *ovsdb_get_table(const struct ovsdb *, const char *);

struct ovsdb_txn *ovsdb_execute_compose(
    struct ovsdb *, const struct ovsdb_session *, const struct json *params,
    bool read_only, const char *role, const char *id,
    long long int elapsed_msec, long long int *timeout_msec,
    bool *durable, struct json **);

struct json *ovsdb_execute(struct ovsdb *, const struct ovsdb_session *,
                           const struct json *params, bool read_only,
                           const char *role, const char *id,
                           long long int elapsed_msec,
                           long long int *timeout_msec);

struct ovsdb_error *ovsdb_snapshot(struct ovsdb *) OVS_WARN_UNUSED_RESULT;

void ovsdb_replace(struct ovsdb *dst, struct ovsdb *src);

#endif /* ovsdb/ovsdb.h */