forked from elastic/beats
/
collstats.go
107 lines (87 loc) · 2.74 KB
/
collstats.go
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package collstats
import (
"errors"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/cfgwarn"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/module/mongodb"
"gopkg.in/mgo.v2"
)
var debugf = logp.MakeDebug("mongodb.collstats")
func init() {
if err := mb.Registry.AddMetricSet("mongodb", "collstats", 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
dialInfo *mgo.DialInfo
}
// New create 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) {
cfgwarn.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
return &MetricSet{
BaseMetricSet: base,
dialInfo: dialInfo,
}, 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 collections.
var events []common.MapStr
// instantiate direct connections to each of the configured Mongo hosts
mongoSession, err := mongodb.NewDirectSession(m.dialInfo)
if err != nil {
return nil, err
}
defer mongoSession.Close()
result := common.MapStr{}
err = mongoSession.Run("top", &result)
if err != nil {
logp.Err("Error retrieving collection totals from Mongo instance")
return events, err
}
if _, ok := result["totals"]; !ok {
err = errors.New("Error accessing collection totals in returned data")
logp.Err(err.Error())
return events, err
}
totals, ok := result["totals"].(common.MapStr)
if !ok {
err = errors.New("Collection totals are not a map")
logp.Err(err.Error())
return events, err
}
for group, info := range totals {
if group == "note" {
continue
}
infoMap, ok := info.(common.MapStr)
if !ok {
err = errors.New("Unexpected data returned by mongodb")
logp.Err(err.Error())
continue
}
event, err := eventMapping(group, infoMap)
if err != nil {
logp.Err("Mapping of the event data filed")
continue
}
events = append(events, event)
}
return events, nil
}