scraperhelper: use common scraping interface

receiver/hostmetricsreceiver/factory.go

@@ -124,7 +124,7 @@ func createAddScraperOptions(
 		}
 
 		if ok {
-			scraperControllerOptions = append(scraperControllerOptions, scraperhelper.AddMetricsScraper(hostMetricsScraper))
+			scraperControllerOptions = append(scraperControllerOptions, scraperhelper.AddScraper(hostMetricsScraper))
 			continue
 		}
 
@@ -134,7 +134,7 @@ func createAddScraperOptions(
 		}
 
 		if ok {
-			scraperControllerOptions = append(scraperControllerOptions, scraperhelper.AddResourceMetricsScraper(resourceMetricsScraper))
+			scraperControllerOptions = append(scraperControllerOptions, scraperhelper.AddScraper(resourceMetricsScraper))
 			continue
 		}
 
@@ -144,7 +144,7 @@ func createAddScraperOptions(
 	return scraperControllerOptions, nil
 }
 
-func createHostMetricsScraper(ctx context.Context, logger *zap.Logger, key string, cfg internal.Config, factories map[string]internal.ScraperFactory) (scraper scraperhelper.MetricsScraper, ok bool, err error) {
+func createHostMetricsScraper(ctx context.Context, logger *zap.Logger, key string, cfg internal.Config, factories map[string]internal.ScraperFactory) (scraper scraperhelper.Scraper, ok bool, err error) {
 	factory := factories[key]
 	if factory == nil {
 		ok = false
@@ -156,7 +156,7 @@ func createHostMetricsScraper(ctx context.Context, logger *zap.Logger, key strin
 	return
 }
 
-func createResourceMetricsScraper(ctx context.Context, logger *zap.Logger, key string, cfg internal.Config, factories map[string]internal.ResourceScraperFactory) (scraper scraperhelper.ResourceMetricsScraper, ok bool, err error) {
+func createResourceMetricsScraper(ctx context.Context, logger *zap.Logger, key string, cfg internal.Config, factories map[string]internal.ResourceScraperFactory) (scraper scraperhelper.Scraper, ok bool, err error) {
 	factory := factories[key]
 	if factory == nil {
 		ok = false

receiver/hostmetricsreceiver/hostmetrics_receiver_test.go

@@ -213,32 +213,32 @@ type mockFactory struct{ mock.Mock }
 type mockScraper struct{ mock.Mock }
 
 func (m *mockFactory) CreateDefaultConfig() internal.Config { return &mockConfig{} }
-func (m *mockFactory) CreateMetricsScraper(context.Context, *zap.Logger, internal.Config) (scraperhelper.MetricsScraper, error) {
+func (m *mockFactory) CreateMetricsScraper(context.Context, *zap.Logger, internal.Config) (scraperhelper.Scraper, error) {
 	args := m.MethodCalled("CreateMetricsScraper")
-	return args.Get(0).(scraperhelper.MetricsScraper), args.Error(1)
+	return args.Get(0).(scraperhelper.Scraper), args.Error(1)
 }
 
 func (m *mockScraper) ID() config.ComponentID                      { return config.NewID("") }
 func (m *mockScraper) Start(context.Context, component.Host) error { return nil }
 func (m *mockScraper) Shutdown(context.Context) error              { return nil }
-func (m *mockScraper) Scrape(context.Context, config.ComponentID) (pdata.MetricSlice, error) {
-	return pdata.NewMetricSlice(), errors.New("err1")
+func (m *mockScraper) Scrape(context.Context, config.ComponentID) (pdata.Metrics, error) {
+	return pdata.NewMetrics(), errors.New("err1")
 }
 
 type mockResourceFactory struct{ mock.Mock }
 type mockResourceScraper struct{ mock.Mock }
 
 func (m *mockResourceFactory) CreateDefaultConfig() internal.Config { return &mockConfig{} }
-func (m *mockResourceFactory) CreateResourceMetricsScraper(context.Context, *zap.Logger, internal.Config) (scraperhelper.ResourceMetricsScraper, error) {
+func (m *mockResourceFactory) CreateResourceMetricsScraper(context.Context, *zap.Logger, internal.Config) (scraperhelper.Scraper, error) {
 	args := m.MethodCalled("CreateResourceMetricsScraper")
-	return args.Get(0).(scraperhelper.ResourceMetricsScraper), args.Error(1)
+	return args.Get(0).(scraperhelper.Scraper), args.Error(1)
 }
 
 func (m *mockResourceScraper) ID() config.ComponentID                      { return config.NewID("") }
 func (m *mockResourceScraper) Start(context.Context, component.Host) error { return nil }
 func (m *mockResourceScraper) Shutdown(context.Context) error              { return nil }
-func (m *mockResourceScraper) Scrape(context.Context, config.ComponentID) (pdata.ResourceMetricsSlice, error) {
-	return pdata.NewResourceMetricsSlice(), errors.New("err2")
+func (m *mockResourceScraper) Scrape(context.Context, config.ComponentID) (pdata.Metrics, error) {
+	return pdata.NewMetrics(), errors.New("err2")
 }
 
 func TestGatherMetrics_ScraperKeyConfigError(t *testing.T) {

receiver/hostmetricsreceiver/internal/scraper.go

@@ -34,7 +34,7 @@ type ScraperFactory interface {
 
 	// CreateMetricsScraper creates a scraper based on this config.
 	// If the config is not valid, error will be returned instead.
-	CreateMetricsScraper(ctx context.Context, logger *zap.Logger, cfg Config) (scraperhelper.MetricsScraper, error)
+	CreateMetricsScraper(ctx context.Context, logger *zap.Logger, cfg Config) (scraperhelper.Scraper, error)
 }
 
 // ResourceScraperFactory can create a ResourceScraper.
@@ -43,7 +43,7 @@ type ResourceScraperFactory interface {
 
 	// CreateResourceMetricsScraper creates a resource scraper based on this
 	// config. If the config is not valid, error will be returned instead.
-	CreateResourceMetricsScraper(ctx context.Context, logger *zap.Logger, cfg Config) (scraperhelper.ResourceMetricsScraper, error)
+	CreateResourceMetricsScraper(ctx context.Context, logger *zap.Logger, cfg Config) (scraperhelper.Scraper, error)
 }
 
 // Config is the configuration of a scraper.

receiver/hostmetricsreceiver/internal/scraper/cpuscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s := newCPUScraper(ctx, cfg)
 

receiver/hostmetricsreceiver/internal/scraper/diskscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s, err := newDiskScraper(ctx, cfg)
 	if err != nil {

receiver/hostmetricsreceiver/internal/scraper/filesystemscraper/factory.go

@@ -49,7 +49,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s, err := newFileSystemScraper(ctx, cfg)
 	if err != nil {

receiver/hostmetricsreceiver/internal/scraper/loadscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	logger *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s := newLoadScraper(ctx, logger, cfg)
 

receiver/hostmetricsreceiver/internal/scraper/memoryscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s := newMemoryScraper(ctx, cfg)
 

receiver/hostmetricsreceiver/internal/scraper/networkscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s, err := newNetworkScraper(ctx, cfg)
 	if err != nil {

receiver/hostmetricsreceiver/internal/scraper/pagingscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s := newPagingScraper(ctx, cfg)
 

receiver/hostmetricsreceiver/internal/scraper/processesscraper/factory.go

@@ -44,7 +44,7 @@ func (f *Factory) CreateMetricsScraper(
 	ctx context.Context,
 	_ *zap.Logger,
 	config internal.Config,
-) (scraperhelper.MetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	cfg := config.(*Config)
 	s := newProcessesScraper(ctx, cfg)
 

receiver/hostmetricsreceiver/internal/scraper/processscraper/factory.go

@@ -47,7 +47,7 @@ func (f *Factory) CreateResourceMetricsScraper(
 	_ context.Context,
 	_ *zap.Logger,
 	cfg internal.Config,
-) (scraperhelper.ResourceMetricsScraper, error) {
+) (scraperhelper.Scraper, error) {
 	if runtime.GOOS != "linux" && runtime.GOOS != "windows" {
 		return nil, errors.New("process scraper only available on Linux or Windows")
 	}

receiver/scraperhelper/scraper.go

@@ -37,28 +37,15 @@ type baseSettings struct {
 // ScraperOption apply changes to internal options.
 type ScraperOption func(*baseSettings)
 
-// BaseScraper is the base interface for scrapers.
-type BaseScraper interface {
+// Scraper is the base interface for scrapers.
+type Scraper interface {
 	component.Component
 
 	// ID returns the scraper id.
 	ID() config.ComponentID
+	Scrape(context.Context, config.ComponentID) (pdata.Metrics, error)
 }
 
-// MetricsScraper is an interface for scrapers that scrape metrics.
-type MetricsScraper interface {
-	BaseScraper
-	Scrape(context.Context, config.ComponentID) (pdata.MetricSlice, error)
-}
-
-// ResourceMetricsScraper is an interface for scrapers that scrape resource metrics.
-type ResourceMetricsScraper interface {
-	BaseScraper
-	Scrape(context.Context, config.ComponentID) (pdata.ResourceMetricsSlice, error)
-}
-
-var _ BaseScraper = (*baseScraper)(nil)
-
 type baseScraper struct {
 	component.Component
 	id config.ComponentID
@@ -87,7 +74,7 @@ type metricsScraper struct {
 	ScrapeMetrics
 }
 
-var _ MetricsScraper = (*metricsScraper)(nil)
+var _ Scraper = (*metricsScraper)(nil)
 
 // NewMetricsScraper creates a Scraper that calls Scrape at the specified
 // collection interval, reports observability information, and passes the
@@ -96,7 +83,7 @@ func NewMetricsScraper(
 	name string,
 	scrape ScrapeMetrics,
 	options ...ScraperOption,
-) MetricsScraper {
+) Scraper {
 	set := &baseSettings{}
 	for _, op := range options {
 		op(set)
@@ -113,7 +100,7 @@ func NewMetricsScraper(
 	return ms
 }
 
-func (ms metricsScraper) Scrape(ctx context.Context, receiverID config.ComponentID) (pdata.MetricSlice, error) {
+func (ms metricsScraper) Scrape(ctx context.Context, receiverID config.ComponentID) (pdata.Metrics, error) {
 	ctx = obsreport.ScraperContext(ctx, receiverID, ms.ID())
 	scrp := obsreport.NewScraper(obsreport.ScraperSettings{ReceiverID: receiverID, Scraper: ms.ID()})
 	ctx = scrp.StartMetricsOp(ctx)
@@ -122,16 +109,20 @@ func (ms metricsScraper) Scrape(ctx context.Context, receiverID config.Component
 	if err == nil {
 		count = metrics.Len()
 	}
+	md := pdata.NewMetrics()
+	if metrics.Len() > 0 {
+		metrics.MoveAndAppendTo(md.ResourceMetrics().AppendEmpty().InstrumentationLibraryMetrics().AppendEmpty().Metrics())
+	}
 	scrp.EndMetricsOp(ctx, count, err)
-	return metrics, err
+	return md, err
 }
 
 type resourceMetricsScraper struct {
 	baseScraper
 	ScrapeResourceMetrics
 }
 
-var _ ResourceMetricsScraper = (*resourceMetricsScraper)(nil)
+var _ Scraper = (*resourceMetricsScraper)(nil)
 
 // NewResourceMetricsScraper creates a Scraper that calls Scrape at the
 // specified collection interval, reports observability information, and
@@ -140,7 +131,7 @@ func NewResourceMetricsScraper(
 	id config.ComponentID,
 	scrape ScrapeResourceMetrics,
 	options ...ScraperOption,
-) ResourceMetricsScraper {
+) Scraper {
 	set := &baseSettings{}
 	for _, op := range options {
 		op(set)
@@ -157,7 +148,7 @@ func NewResourceMetricsScraper(
 	return rms
 }
 
-func (rms resourceMetricsScraper) Scrape(ctx context.Context, receiverID config.ComponentID) (pdata.ResourceMetricsSlice, error) {
+func (rms resourceMetricsScraper) Scrape(ctx context.Context, receiverID config.ComponentID) (pdata.Metrics, error) {
 	ctx = obsreport.ScraperContext(ctx, receiverID, rms.ID())
 	scrp := obsreport.NewScraper(obsreport.ScraperSettings{ReceiverID: receiverID, Scraper: rms.ID()})
 	ctx = scrp.StartMetricsOp(ctx)
@@ -166,8 +157,14 @@ func (rms resourceMetricsScraper) Scrape(ctx context.Context, receiverID config.
 	if err == nil {
 		count = metricCount(resourceMetrics)
 	}
+
+	md := pdata.NewMetrics()
+	if resourceMetrics.Len() > 0 {
+		resourceMetrics.MoveAndAppendTo(md.ResourceMetrics())
+	}
+
 	scrp.EndMetricsOp(ctx, count, err)
-	return resourceMetrics, err
+	return md, err
 }
 
 func metricCount(resourceMetrics pdata.ResourceMetricsSlice) int {