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/*
** Zabbix
** Copyright (C) 2001-2021 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 mongodb
import (
"encoding/json"
"time"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"zabbix.com/pkg/zbxerr"
)
type oplogStats struct {
TimeDiff int `json:"timediff"` // in seconds
}
type oplogEntry struct {
Timestamp bson.MongoTimestamp `bson:"ts"`
}
const (
oplogReplicaSet = "oplog.rs" // the capped collection that holds the oplog for Replica Set Members
oplogMasterSlave = "oplog.$main" // oplog for the master-slave configuration
)
const (
sortAsc = "$natural"
sortDesc = "-$natural"
)
var oplogQuery = bson.M{"ts": bson.M{"$exists": true}}
// oplogStatsHandler
// https://docs.mongodb.com/manual/reference/method/db.getReplicationInfo/index.html
func oplogStatsHandler(s Session, _ map[string]string) (interface{}, error) {
var (
stats oplogStats
opFirst, opLast oplogEntry
)
localDb := s.DB("local")
for _, collection := range []string{oplogReplicaSet, oplogMasterSlave} {
if err := localDb.C(collection).Find(oplogQuery).
Sort(sortAsc).Limit(1).
SetMaxTime(time.Duration(s.GetMaxTimeMS()) * time.Millisecond).
One(&opFirst); err != nil {
if err == mgo.ErrNotFound {
continue
}
return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
}
if err := localDb.C(collection).Find(oplogQuery).Sort(sortDesc).Limit(1).One(&opLast); err != nil {
return nil, zbxerr.ErrorCannotFetchData.Wrap(err)
}
break
}
// BSON has a special timestamp type for internal MongoDB use and is not associated with the regular Date type.
// This internal timestamp type is a 64 bit value where:
// the most significant 32 bits are a time_t value (seconds since the Unix epoch)
// the least significant 32 bits are an incrementing ordinal for operations within a given second.
stats.TimeDiff = int(opLast.Timestamp>>32 - opFirst.Timestamp>>32)
jsonRes, err := json.Marshal(stats)
if err != nil {
return nil, zbxerr.ErrorCannotMarshalJSON.Wrap(err)
}
return string(jsonRes), nil
}
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