Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

package redis

​

import (

    "context"

    "errors"

    "sync"

    "time"

​

    "github.com/mediocregopher/radix/v3"

    "golang.zabbix.com/sdk/log"

    "golang.zabbix.com/sdk/uri"

    "golang.zabbix.com/sdk/zbxerr"

)

​

const hkInterval = 10

​

var errMasterDown = errors.New("MASTERDOWN Link with MASTER is down and slave-serve-stale-data is set to 'no'.")

​

type redisClient interface {

    Query(cmd radix.CmdAction) error

}

​

type RedisConn struct {

    client         radix.Client

    lastTimeAccess time.Time

}

​

// Query wraps the radix.Client.Do function.

func (r *RedisConn) Query(cmd radix.CmdAction) error {

    return r.client.Do(cmd)

}

​

// updateAccessTime updates the last time a connection was accessed.

func (r *RedisConn) updateAccessTime() {

    r.lastTimeAccess = time.Now()

}

​

// ConnManager is thread-safe structure for manage connections.

type ConnManager struct {

    sync.Mutex

    connMutex   sync.Mutex

    connections map[uri.URI]*RedisConn

    keepAlive   time.Duration

    timeout     time.Duration

    Destroy     context.CancelFunc

}

​

// NewConnManager initializes ConnManager structure and runs Go Routine that watches for unused connections.

func NewConnManager(keepAlive, timeout, hkInterval time.Duration) *ConnManager {