Zabbix

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** This program is distributed in the hope that it will be useful,

** but WITHOUT ANY WARRANTY; without even the implied warranty of

** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

** GNU General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

package postgres

​

import (

    "context"

    "database/sql"

    "errors"

    "strconv"

​

    "git.zabbix.com/ap/plugin-support/zbxerr"

    "github.com/jackc/pgx/v4"

)

​

// replicationHandler gets info about recovery state if all is OK or nil otherwise.

func replicationHandler(ctx context.Context, conn PostgresClient,

    key string, _ map[string]string, _ ...string) (interface{}, error) {

    var (

        replicationResult int64

        status            int

        query             string

        stringResult      sql.NullString

        inRecovery        bool

    )

​

    switch key {

    case keyReplicationStatus:

        row, err := conn.QueryRow(ctx, `SELECT pg_is_in_recovery()`)

        if err != nil {

            return nil, zbxerr.ErrorCannotFetchData.Wrap(err)

        }

​

        err = row.Scan(&inRecovery)

        if err != nil {

            return nil, zbxerr.ErrorCannotFetchData.Wrap(err)

        }

​

        if inRecovery {

            row, err = conn.QueryRow(ctx, `SELECT COUNT(*) FROM pg_stat_wal_receiver`)

            if err != nil {

                return nil, zbxerr.ErrorCannotFetchData.Wrap(err)

            }

​

            err = row.Scan(&status)

            if err != nil {

                if errors.Is(err, pgx.ErrNoRows) {