PostgreSQL

/*

** Zabbix

** Copyright 2001-2024 Zabbix SIA

**

** 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.

**/

​

package plugin

​

import (

    "context"

    "fmt"

)

​

const (

    pingFailed = 0

    pingOk     = 1

)

​

// pingHandler queries 'SELECT 1' and returns pingOk if a connection is alive or pingFailed otherwise.

func pingHandler(ctx context.Context, conn PostgresClient,

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

    var res int

​

    row, err := conn.QueryRow(ctx, fmt.Sprintf("SELECT %d", pingOk))

    if err != nil {

        return pingFailed, nil

    }

​

    err = row.Scan(&res)

​

    if err != nil || res != pingOk {

        return pingFailed, nil

    }

​

    return pingOk, nil

}