MongoDB input plugin: Adding per DB stats (#1466)

CHANGELOG.md

@@ -49,6 +49,7 @@ should now look like:
 - [#1500](https://github.com/influxdata/telegraf/pull/1500): Aerospike plugin refactored to use official client lib.
 - [#1434](https://github.com/influxdata/telegraf/pull/1434): Add measurement name arg to logparser plugin.
 - [#1479](https://github.com/influxdata/telegraf/pull/1479): logparser: change resp_code from a field to a tag.
+- [#1466](https://github.com/influxdata/telegraf/pull/1466): MongoDB input plugin: adding per DB stats from db.stats()
 
 ### Bugfixes
 

plugins/inputs/mongodb/README.md

@@ -10,6 +10,7 @@
   ##   mongodb://10.10.3.33:18832,
   ##   10.0.0.1:10000, etc.
   servers = ["127.0.0.1:27017"]
+  gather_perdb_stats = false
 ```
 
 For authenticated mongodb istances use connection mongdb connection URI
@@ -52,3 +53,15 @@ and create a single measurement containing values e.g.
  * ttl_passes_per_sec
  * repl_lag
  * jumbo_chunks (only if mongos or mongo config)
+
+If gather_db_stats is set to true, it will also collect per database stats exposed by db.stats()
+creating another measurement called mongodb_db_stats and containing values:
+ * collections
+ * objects
+ * avg_obj_size
+ * data_size
+ * storage_size
+ * num_extents
+ * indexes
+ * index_size
+ * ok

plugins/inputs/mongodb/mongodb.go

@@ -15,9 +15,10 @@ import (
 )
 
 type MongoDB struct {
-	Servers []string
+	Servers          []string
-	Ssl     Ssl
+	Ssl              Ssl
-	mongos  map[string]*Server
+	mongos           map[string]*Server
+	GatherPerdbStats bool
 }
 
 type Ssl struct {
@@ -32,6 +33,7 @@ var sampleConfig = `
   ##   mongodb://10.10.3.33:18832,
   ##   10.0.0.1:10000, etc.
   servers = ["127.0.0.1:27017"]
+  gather_perdb_stats = false
 `
 
 func (m *MongoDB) SampleConfig() string {
@@ -135,7 +137,7 @@ func (m *MongoDB) gatherServer(server *Server, acc telegraf.Accumulator) error {
 		}
 		server.Session = sess
 	}
-	return server.gatherData(acc)
+	return server.gatherData(acc, m.GatherPerdbStats)
 }
 
 func init() {

plugins/inputs/mongodb/mongodb_data.go

@@ -12,6 +12,12 @@ type MongodbData struct {
 	StatLine *StatLine
 	Fields   map[string]interface{}
 	Tags     map[string]string
+	DbData   []DbData
+}
+
+type DbData struct {
+	Name   string
+	Fields map[string]interface{}
 }
 
 func NewMongodbData(statLine *StatLine, tags map[string]string) *MongodbData {
@@ -22,6 +28,7 @@ func NewMongodbData(statLine *StatLine, tags map[string]string) *MongodbData {
 		StatLine: statLine,
 		Tags:     tags,
 		Fields:   make(map[string]interface{}),
+		DbData:   []DbData{},
 	}
 }
 
@@ -72,6 +79,34 @@ var WiredTigerStats = map[string]string{
 	"percent_cache_used":  "CacheUsedPercent",
 }
 
+var DbDataStats = map[string]string{
+	"collections":  "Collections",
+	"objects":      "Objects",
+	"avg_obj_size": "AvgObjSize",
+	"data_size":    "DataSize",
+	"storage_size": "StorageSize",
+	"num_extents":  "NumExtents",
+	"indexes":      "Indexes",
+	"index_size":   "IndexSize",
+	"ok":           "Ok",
+}
+
+func (d *MongodbData) AddDbStats() {
+	for _, dbstat := range d.StatLine.DbStatsLines {
+		dbStatLine := reflect.ValueOf(&dbstat).Elem()
+		newDbData := &DbData{
+			Name:   dbstat.Name,
+			Fields: make(map[string]interface{}),
+		}
+		newDbData.Fields["type"] = "db_stat"
+		for key, value := range DbDataStats {
+			val := dbStatLine.FieldByName(value).Interface()
+			newDbData.Fields[key] = val
+		}
+		d.DbData = append(d.DbData, *newDbData)
+	}
+}
+
 func (d *MongodbData) AddDefaultStats() {
 	statLine := reflect.ValueOf(d.StatLine).Elem()
 	d.addStat(statLine, DefaultStats)
@@ -113,4 +148,15 @@ func (d *MongodbData) flush(acc telegraf.Accumulator) {
 		d.StatLine.Time,
 	)
 	d.Fields = make(map[string]interface{})
+
+	for _, db := range d.DbData {
+		d.Tags["db_name"] = db.Name
+		acc.AddFields(
+			"mongodb_db_stats",
+			db.Fields,
+			d.Tags,
+			d.StatLine.Time,
+		)
+		db.Fields = make(map[string]interface{})
+	}
 }

plugins/inputs/mongodb/mongodb_server.go

@@ -22,7 +22,7 @@ func (s *Server) getDefaultTags() map[string]string {
 	return tags
 }
 
-func (s *Server) gatherData(acc telegraf.Accumulator) error {
+func (s *Server) gatherData(acc telegraf.Accumulator, gatherDbStats bool) error {
 	s.Session.SetMode(mgo.Eventual, true)
 	s.Session.SetSocketTimeout(0)
 	result_server := &ServerStatus{}
@@ -42,10 +42,34 @@ func (s *Server) gatherData(acc telegraf.Accumulator) error {
 		JumboChunksCount: int64(jumbo_chunks),
 	}
 
+	result_db_stats := &DbStats{}
+
+	if gatherDbStats == true {
+		names := []string{}
+		names, err = s.Session.DatabaseNames()
+		if err != nil {
+			log.Println("Error getting database names (" + err.Error() + ")")
+		}
+		for _, db_name := range names {
+			db_stat_line := &DbStatsData{}
+			err = s.Session.DB(db_name).Run(bson.D{{"dbStats", 1}}, db_stat_line)
+			if err != nil {
+				log.Println("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,
 	}
 
 	defer func() {
@@ -64,6 +88,7 @@ func (s *Server) gatherData(acc telegraf.Accumulator) error {
 			s.getDefaultTags(),
 		)
 		data.AddDefaultStats()
+		data.AddDbStats()
 		data.flush(acc)
 	}
 	return nil

plugins/inputs/mongodb/mongodb_server_test.go

@@ -29,12 +29,12 @@ func TestGetDefaultTags(t *testing.T) {
 func TestAddDefaultStats(t *testing.T) {
 	var acc testutil.Accumulator
 
-	err := server.gatherData(&acc)
+	err := server.gatherData(&acc, false)
 	require.NoError(t, err)
 
 	time.Sleep(time.Duration(1) * time.Second)
 	// need to call this twice so it can perform the diff
-	err = server.gatherData(&acc)
+	err = server.gatherData(&acc, false)
 	require.NoError(t, err)
 
 	for key, _ := range DefaultStats {

plugins/inputs/mongodb/mongostat.go

@@ -35,6 +35,7 @@ type MongoStatus struct {
 	ServerStatus  *ServerStatus
 	ReplSetStatus *ReplSetStatus
 	ClusterStatus *ClusterStatus
+	DbStats       *DbStats
 }
 
 type ServerStatus struct {
@@ -65,6 +66,32 @@ type ServerStatus struct {
 	Metrics            *MetricsStats          `bson:"metrics"`
 }
 
+// DbStats stores stats from all dbs
+type DbStats struct {
+	Dbs []Db
+}
+
+// Db represent a single DB
+type Db struct {
+	Name        string
+	DbStatsData *DbStatsData
+}
+
+// DbStatsData stores stats from a db
+type DbStatsData struct {
+	Db          string      `bson:"db"`
+	Collections int64       `bson:"collections"`
+	Objects     int64       `bson:"objects"`
+	AvgObjSize  float64     `bson:"avgObjSize"`
+	DataSize    int64       `bson:"dataSize"`
+	StorageSize int64       `bson:"storageSize"`
+	NumExtents  int64       `bson:"numExtents"`
+	Indexes     int64       `bson:"indexes"`
+	IndexSize   int64       `bson:"indexSize"`
+	Ok          int64       `bson:"ok"`
+	GleStats    interface{} `bson:"gleStats"`
+}
+
 // ClusterStatus stores information related to the whole cluster
 type ClusterStatus struct {
 	JumboChunksCount int64
@@ -396,6 +423,22 @@ type StatLine struct {
 
 	// Cluster fields
 	JumboChunksCount int64
+
+	// DB stats field
+	DbStatsLines []DbStatLine
+}
+
+type DbStatLine struct {
+	Name        string
+	Collections int64
+	Objects     int64
+	AvgObjSize  float64
+	DataSize    int64
+	StorageSize int64
+	NumExtents  int64
+	Indexes     int64
+	IndexSize   int64
+	Ok          int64
 }
 
 func parseLocks(stat ServerStatus) map[string]LockUsage {
@@ -677,5 +720,27 @@ func NewStatLine(oldMongo, newMongo MongoStatus, key string, all bool, sampleSec
 	newClusterStat := *newMongo.ClusterStatus
 	returnVal.JumboChunksCount = newClusterStat.JumboChunksCount
 
+	newDbStats := *newMongo.DbStats
+	for _, db := range newDbStats.Dbs {
+		dbStatsData := db.DbStatsData
+		// mongos doesn't have the db key, so setting the db name
+		if dbStatsData.Db == "" {
+			dbStatsData.Db = db.Name
+		}
+		dbStatLine := &DbStatLine{
+			Name:        dbStatsData.Db,
+			Collections: dbStatsData.Collections,
+			Objects:     dbStatsData.Objects,
+			AvgObjSize:  dbStatsData.AvgObjSize,
+			DataSize:    dbStatsData.DataSize,
+			StorageSize: dbStatsData.StorageSize,
+			NumExtents:  dbStatsData.NumExtents,
+			Indexes:     dbStatsData.Indexes,
+			IndexSize:   dbStatsData.IndexSize,
+			Ok:          dbStatsData.Ok,
+		}
+		returnVal.DbStatsLines = append(returnVal.DbStatsLines, *dbStatLine)
+	}
+
 	return returnVal
 }