[Metricbeat] Migrate Ceph cluster_disk to use ReporterV2 interface

metricbeat/module/ceph/cluster_disk/cluster_disk.go

@@ -18,7 +18,6 @@
 package cluster_disk
 
 import (
-	"github.com/elastic/beats/libbeat/common"
 	"github.com/elastic/beats/metricbeat/helper"
 	"github.com/elastic/beats/metricbeat/mb"
 	"github.com/elastic/beats/metricbeat/mb/parse"
@@ -61,12 +60,23 @@ func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
 	}, nil
 }
 
-func (m *MetricSet) Fetch() (common.MapStr, error) {
+// Fetch methods implements the data gathering and data conversion to the right
+// format. It publishes the event which is then forwarded to the output. In case
+// of an error set the Error field of mb.Event or simply call report.Error().
+func (m *MetricSet) Fetch(reporter mb.ReporterV2) error {
 	content, err := m.HTTP.FetchContent()
+	if err != nil {
+		return err
+	}
 
+	event, err := eventMapping(content)
 	if err != nil {
-		return nil, err
+		return err
+	}
+
+	if reported := reporter.Event(mb.Event{MetricSetFields: event}); !reported {
+		m.Logger().Debug("error reporting event")
 	}
 
-	return eventMapping(content), nil
+	return nil
 }

metricbeat/module/ceph/cluster_disk/cluster_disk_integration_test.go

@@ -15,6 +15,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
+// +build integration
+
 package cluster_disk
 
 import (
@@ -26,9 +28,9 @@ import (
 )
 
 func TestData(t *testing.T) {
-	f := mbtest.NewEventFetcher(t, getConfig())
-	err := mbtest.WriteEvent(f, t)
-	if err != nil {
+	f := mbtest.NewReportingMetricSetV2Error(t, getConfig())
+
+	if err := mbtest.WriteEventsReporterV2Error(f, t, ""); err != nil {
 		t.Fatal("write", err)
 	}
 }

metricbeat/module/ceph/cluster_disk/cluster_disk_test.go

@@ -50,8 +50,13 @@ func TestFetchEventContents(t *testing.T) {
 		"hosts":      []string{server.URL},
 	}
 
-	f := mbtest.NewEventFetcher(t, config)
-	event, err := f.Fetch()
+	f := mbtest.NewReportingMetricSetV2Error(t, config)
+	events, errs := mbtest.ReportingFetchV2Error(f)
+	if len(errs) > 0 {
+		t.Fatalf("Expected 0 error, had %d. %v\n", len(errs), errs)
+	}
+	assert.NotEmpty(t, events)
+	event := events[0].MetricSetFields
 
 	t.Logf("%s/%s event: %+v", f.Module().Name(), f.Name(), event.StringToPrint())
 

metricbeat/module/ceph/cluster_disk/data.go

@@ -20,8 +20,9 @@ package cluster_disk
 import (
 	"encoding/json"
 
+	"github.com/pkg/errors"
+
 	"github.com/elastic/beats/libbeat/common"
-	"github.com/elastic/beats/libbeat/logp"
 )
 
 type StatsCluster struct {
@@ -39,11 +40,11 @@ type DfRequest struct {
 	Output Output `json:"output"`
 }
 
-func eventMapping(content []byte) common.MapStr {
+func eventMapping(content []byte) (common.MapStr, error) {
 	var d DfRequest
 	err := json.Unmarshal(content, &d)
 	if err != nil {
-		logp.Err("Error: %+v", err)
+		return nil, errors.Wrap(err, "could not get DFRequest data")
 	}
 
 	return common.MapStr{
@@ -56,5 +57,5 @@ func eventMapping(content []byte) common.MapStr {
 		"available": common.MapStr{
 			"bytes": d.Output.StatsCluster.TotalAvailBytes,
 		},
-	}
+	}, nil
 }