telegraf/plugins/inputs/mongodb/mongodb_server.go

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package mongodb
import (
"log"
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"net/url"
"time"
"github.com/influxdata/telegraf"
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"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type Server struct {
Url *url.URL
Session *mgo.Session
lastResult *MongoStatus
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}
func (s *Server) getDefaultTags() map[string]string {
tags := make(map[string]string)
tags["hostname"] = s.Url.Host
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return tags
}
type oplogEntry struct {
Timestamp bson.MongoTimestamp `bson:"ts"`
}
func (s *Server) gatherOplogStats() *OplogStats {
stats := &OplogStats{}
localdb := s.Session.DB("local")
op_first := oplogEntry{}
op_last := oplogEntry{}
query := bson.M{"ts": bson.M{"$exists": true}}
for _, collection_name := range []string{"oplog.rs", "oplog.$main"} {
if err := localdb.C(collection_name).Find(query).Sort("$natural").Limit(1).One(&op_first); err != nil {
if err == mgo.ErrNotFound {
continue
}
log.Println("E! Error getting first oplog entry (" + err.Error() + ")")
return stats
}
if err := localdb.C(collection_name).Find(query).Sort("-$natural").Limit(1).One(&op_last); err != nil {
if err == mgo.ErrNotFound {
continue
}
log.Println("E! Error getting last oplog entry (" + err.Error() + ")")
return stats
}
}
op_first_time := time.Unix(int64(op_first.Timestamp>>32), 0)
op_last_time := time.Unix(int64(op_last.Timestamp>>32), 0)
stats.TimeDiff = int64(op_last_time.Sub(op_first_time).Seconds())
return stats
}
func (s *Server) gatherData(acc telegraf.Accumulator, gatherDbStats bool) error {
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s.Session.SetMode(mgo.Eventual, true)
s.Session.SetSocketTimeout(0)
result_server := &ServerStatus{}
err := s.Session.DB("admin").Run(bson.D{
{
Name: "serverStatus",
Value: 1,
},
{
Name: "recordStats",
Value: 0,
},
}, result_server)
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if err != nil {
return err
}
result_repl := &ReplSetStatus{}
// ignore error because it simply indicates that the db is not a member
// in a replica set, which is fine.
_ = s.Session.DB("admin").Run(bson.D{
{
Name: "replSetGetStatus",
Value: 1,
},
}, result_repl)
jumbo_chunks, _ := s.Session.DB("config").C("chunks").Find(bson.M{"jumbo": true}).Count()
result_cluster := &ClusterStatus{
JumboChunksCount: int64(jumbo_chunks),
}
resultShards := &ShardStats{}
err = s.Session.DB("admin").Run(bson.D{
{
Name: "shardConnPoolStats",
Value: 1,
},
}, &resultShards)
if err != nil {
log.Println("E! Error getting database shard stats (" + err.Error() + ")")
}
oplogStats := s.gatherOplogStats()
result_db_stats := &DbStats{}
if gatherDbStats == true {
names := []string{}
names, err = s.Session.DatabaseNames()
if err != nil {
log.Println("E! Error getting database names (" + err.Error() + ")")
}
for _, db_name := range names {
db_stat_line := &DbStatsData{}
err = s.Session.DB(db_name).Run(bson.D{
{
Name: "dbStats",
Value: 1,
},
}, db_stat_line)
if err != nil {
log.Println("E! Error getting db stats from " + db_name + "(" + err.Error() + ")")
}
db := &Db{
Name: db_name,
DbStatsData: db_stat_line,
}
result_db_stats.Dbs = append(result_db_stats.Dbs, *db)
}
}
result := &MongoStatus{
ServerStatus: result_server,
ReplSetStatus: result_repl,
ClusterStatus: result_cluster,
DbStats: result_db_stats,
ShardStats: resultShards,
OplogStats: oplogStats,
}
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defer func() {
s.lastResult = result
}()
result.SampleTime = time.Now()
if s.lastResult != nil && result != nil {
duration := result.SampleTime.Sub(s.lastResult.SampleTime)
durationInSeconds := int64(duration.Seconds())
if durationInSeconds == 0 {
durationInSeconds = 1
}
data := NewMongodbData(
NewStatLine(*s.lastResult, *result, s.Url.Host, true, durationInSeconds),
s.getDefaultTags(),
)
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data.AddDefaultStats()
data.AddDbStats()
data.AddShardHostStats()
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data.flush(acc)
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}
return nil
}