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collector.go
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collector.go
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package collector
import (
"encoding/json"
"strings"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/cfgwarn"
"github.com/elastic/beats/metricbeat/helper"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/parse"
)
const (
defaultScheme = "http"
defaultPath = "/metrics/metrics"
)
var (
hostParser = parse.URLHostParserBuilder{
DefaultScheme: defaultScheme,
DefaultPath: defaultPath,
PathConfigKey: "metrics_path",
}.Build()
)
// 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("dropwizard", "collector", New, hostParser); 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
http *helper.HTTP
namespace string
}
// 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.Beta("The dropwizard collector metricset is beta")
config := struct {
Namespace string `config:"namespace" validate:"required"`
}{}
if err := base.Module().UnpackConfig(&config); err != nil {
return nil, err
}
return &MetricSet{
BaseMetricSet: base,
http: helper.NewHTTP(base),
namespace: config.Namespace,
}, 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) {
body, err := m.http.FetchContent()
if err != nil {
return nil, err
}
dw := map[string]interface{}{}
d := json.NewDecoder(strings.NewReader(string(body)))
d.UseNumber()
err = d.Decode(&dw)
if err != nil {
return nil, err
}
eventList := eventMapping(dw)
// Converts hash list to slice
events := []common.MapStr{}
for _, event := range eventList {
event[mb.NamespaceKey] = m.namespace
events = append(events, event)
}
return events, err
}