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bgwriter.go
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/
bgwriter.go
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package bgwriter
import (
"database/sql"
"fmt"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/module/postgresql"
"github.com/pkg/errors"
// Register postgresql database/sql driver
_ "github.com/lib/pq"
)
// 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("postgresql", "bgwriter", New, postgresql.ParseURL); err != nil {
panic(err)
}
}
// MetricSet type defines all fields of the MetricSet
type MetricSet struct {
mb.BaseMetricSet
}
// New create a new instance of the MetricSet.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
return &MetricSet{BaseMetricSet: base}, nil
}
// Fetch methods implements the data gathering and data conversion to the right format
func (m *MetricSet) Fetch() (common.MapStr, error) {
db, err := sql.Open("postgres", m.HostData().URI)
if err != nil {
return nil, err
}
defer db.Close()
results, err := postgresql.QueryStats(db, "SELECT * FROM pg_stat_bgwriter")
if err != nil {
return nil, errors.Wrap(err, "QueryStats")
}
if len(results) == 0 {
return nil, fmt.Errorf("No results from the pg_stat_bgwriter query")
}
data, _ := schema.Apply(results[0])
return data, nil
}