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mongodb_server.go
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mongodb_server.go
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package mongodb
import (
"fmt"
"net/url"
"strings"
"time"
"github.com/influxdata/telegraf"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type Server struct {
Url *url.URL
Session *mgo.Session
lastResult *MongoStatus
Log telegraf.Logger
}
func (s *Server) getDefaultTags() map[string]string {
tags := make(map[string]string)
tags["hostname"] = s.Url.Host
return tags
}
type oplogEntry struct {
Timestamp bson.MongoTimestamp `bson:"ts"`
}
func IsAuthorization(err error) bool {
return strings.Contains(err.Error(), "not authorized")
}
func (s *Server) authLog(err error) {
if IsAuthorization(err) {
s.Log.Debug(err.Error())
} else {
s.Log.Error(err.Error())
}
}
func (s *Server) gatherServerStatus() (*ServerStatus, error) {
serverStatus := &ServerStatus{}
err := s.Session.DB("admin").Run(bson.D{
{
Name: "serverStatus",
Value: 1,
},
{
Name: "recordStats",
Value: 0,
},
}, serverStatus)
if err != nil {
return nil, err
}
return serverStatus, nil
}
func (s *Server) gatherReplSetStatus() (*ReplSetStatus, error) {
replSetStatus := &ReplSetStatus{}
err := s.Session.DB("admin").Run(bson.D{
{
Name: "replSetGetStatus",
Value: 1,
},
}, replSetStatus)
if err != nil {
return nil, err
}
return replSetStatus, nil
}
func (s *Server) gatherClusterStatus() (*ClusterStatus, error) {
chunkCount, err := s.Session.DB("config").C("chunks").Find(bson.M{"jumbo": true}).Count()
if err != nil {
return nil, err
}
return &ClusterStatus{
JumboChunksCount: int64(chunkCount),
}, nil
}
func (s *Server) gatherShardConnPoolStats() (*ShardStats, error) {
shardStats := &ShardStats{}
err := s.Session.DB("admin").Run(bson.D{
{
Name: "shardConnPoolStats",
Value: 1,
},
}, &shardStats)
if err != nil {
return nil, err
}
return shardStats, nil
}
func (s *Server) gatherDBStats(name string) (*Db, error) {
stats := &DbStatsData{}
err := s.Session.DB(name).Run(bson.D{
{
Name: "dbStats",
Value: 1,
},
}, stats)
if err != nil {
return nil, err
}
return &Db{
Name: name,
DbStatsData: stats,
}, nil
}
func (s *Server) getOplogReplLag(collection string) (*OplogStats, error) {
query := bson.M{"ts": bson.M{"$exists": true}}
var first oplogEntry
err := s.Session.DB("local").C(collection).Find(query).Sort("$natural").Limit(1).One(&first)
if err != nil {
return nil, err
}
var last oplogEntry
err = s.Session.DB("local").C(collection).Find(query).Sort("-$natural").Limit(1).One(&last)
if err != nil {
return nil, err
}
firstTime := time.Unix(int64(first.Timestamp>>32), 0)
lastTime := time.Unix(int64(last.Timestamp>>32), 0)
stats := &OplogStats{
TimeDiff: int64(lastTime.Sub(firstTime).Seconds()),
}
return stats, nil
}
// The "oplog.rs" collection is stored on all replica set members.
//
// The "oplog.$main" collection is created on the master node of a
// master-slave replicated deployment. As of MongoDB 3.2, master-slave
// replication has been deprecated.
func (s *Server) gatherOplogStats() (*OplogStats, error) {
stats, err := s.getOplogReplLag("oplog.rs")
if err == nil {
return stats, nil
}
return s.getOplogReplLag("oplog.$main")
}
func (s *Server) gatherCollectionStats(colStatsDbs []string) (*ColStats, error) {
names, err := s.Session.DatabaseNames()
if err != nil {
return nil, err
}
results := &ColStats{}
for _, dbName := range names {
if stringInSlice(dbName, colStatsDbs) || len(colStatsDbs) == 0 {
var colls []string
colls, err = s.Session.DB(dbName).CollectionNames()
if err != nil {
s.Log.Errorf("Error getting collection names: %s", err.Error())
continue
}
for _, colName := range colls {
colStatLine := &ColStatsData{}
err = s.Session.DB(dbName).Run(bson.D{
{
Name: "collStats",
Value: colName,
},
}, colStatLine)
if err != nil {
s.authLog(fmt.Errorf("error getting col stats from %q: %v", colName, err))
continue
}
collection := &Collection{
Name: colName,
DbName: dbName,
ColStatsData: colStatLine,
}
results.Collections = append(results.Collections, *collection)
}
}
}
return results, nil
}
func (s *Server) gatherData(acc telegraf.Accumulator, gatherDbStats bool, gatherColStats bool, colStatsDbs []string) error {
s.Session.SetMode(mgo.Eventual, true)
s.Session.SetSocketTimeout(0)
serverStatus, err := s.gatherServerStatus()
if err != nil {
return err
}
// Get replica set status, an error indicates that the server is not a
// member of a replica set.
replSetStatus, err := s.gatherReplSetStatus()
if err != nil {
s.Log.Debugf("Unable to gather replica set status: %s", err.Error())
}
// Gather the oplog if we are a member of a replica set. Non-replica set
// members do not have the oplog collections.
var oplogStats *OplogStats
if replSetStatus != nil {
oplogStats, err = s.gatherOplogStats()
if err != nil {
return err
}
}
clusterStatus, err := s.gatherClusterStatus()
if err != nil {
s.Log.Debugf("Unable to gather cluster status: %s", err.Error())
}
shardStats, err := s.gatherShardConnPoolStats()
if err != nil {
s.authLog(fmt.Errorf("unable to gather shard connection pool stats: %s", err.Error()))
}
var collectionStats *ColStats
if gatherColStats {
stats, err := s.gatherCollectionStats(colStatsDbs)
if err != nil {
return err
}
collectionStats = stats
}
dbStats := &DbStats{}
if gatherDbStats {
names, err := s.Session.DatabaseNames()
if err != nil {
return err
}
for _, name := range names {
db, err := s.gatherDBStats(name)
if err != nil {
s.Log.Debugf("Error getting db stats from %q: %s", name, err.Error())
}
dbStats.Dbs = append(dbStats.Dbs, *db)
}
}
result := &MongoStatus{
ServerStatus: serverStatus,
ReplSetStatus: replSetStatus,
ClusterStatus: clusterStatus,
DbStats: dbStats,
ColStats: collectionStats,
ShardStats: shardStats,
OplogStats: oplogStats,
}
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(),
)
data.AddDefaultStats()
data.AddDbStats()
data.AddColStats()
data.AddShardHostStats()
data.flush(acc)
}
s.lastResult = result
return nil
}
func stringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}