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dbstats.go
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dbstats.go
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package dbstats
import (
"errors"
"gopkg.in/mgo.v2"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/module/mongodb"
)
var debugf = logp.MakeDebug("mongodb.dbstats")
// init registers the MetricSet with the central registry.
// The New method will be called after the setup of the module and before starting to fetch data
func init() {
if err := mb.Registry.AddMetricSet("mongodb", "dbstats", New, mongodb.ParseURL); err != nil {
panic(err)
}
}
// MetricSet type defines all fields of the MetricSet
// As a minimum it must inherit the mb.BaseMetricSet fields, but can be extended with
// additional entries. These variables can be used to persist data or configuration between
// multiple fetch calls.
type MetricSet struct {
mb.BaseMetricSet
mongoSession *mgo.Session
}
// New creates a new instance of the MetricSet
// Part of new is also setting up the configuration by processing additional
// configuration entries if needed.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
logp.Warn("EXPERIMENTAL: The %v %v metricset is experimental", base.Module().Name(), base.Name())
dialInfo, err := mgo.ParseURL(base.HostData().URI)
if err != nil {
return nil, err
}
dialInfo.Timeout = base.Module().Config().Timeout
// instantiate direct connections to each of the configured Mongo hosts
mongoSession, err := mongodb.NewDirectSession(dialInfo)
if err != nil {
return nil, err
}
return &MetricSet{
BaseMetricSet: base,
mongoSession: mongoSession,
}, nil
}
// Fetch methods implements the data gathering and data conversion to the right format
// It returns the event which is then forward to the output. In case of an error, a
// descriptive error must be returned.
func (m *MetricSet) Fetch() ([]common.MapStr, error) {
// events is the list of events collected from each of the databases.
var events []common.MapStr
// Get the list of databases names, which we'll use to call db.stats() on each
dbNames, err := m.mongoSession.DatabaseNames()
if err != nil {
logp.Err("Error retrieving database names from Mongo instance")
return events, err
}
// for each database, call db.stats() and append to events
for _, dbName := range dbNames {
db := m.mongoSession.DB(dbName)
result := common.MapStr{}
err := db.Run("dbStats", &result)
if err != nil {
logp.Err("Failed to retrieve stats for db %s", dbName)
continue
}
events = append(events, eventMapping(result))
}
if len(events) == 0 {
err = errors.New("Failed to retrieve dbStats from any databases")
logp.Err(err.Error())
return events, err
}
return events, nil
}