all: remove OtlpProtoSize in favor of Sizer interface (#3818)

* all: remove OtlpProtoSize in favor of Sizer interface

* add {Metrics|Traces|Logs}Sizer, fix test commenting

* move size tests to pb_test, fix metrics+logs parameter names

* uncommented batch_processor tests + adjusted them to use *Sizer

* I forgot BenchmarkTraceSizeBytes :(

* Add docs for NewProtobof*Sizer + update docs for NewProtobuf*Marshaler

* cast *Marshaler to *Sizer for now

* add casts to batch_processor_test

model/otlp/pb_marshaler.go

@@ -19,27 +19,32 @@ import (
 	"go.opentelemetry.io/collector/model/pdata"
 )
 
-// NewProtobufTracesMarshaler returns a model.TracesMarshaler. Marshals to OTLP binary protobuf bytes.
+// NewProtobufTracesMarshaler returns a pdata.TracesMarshaler. Marshals to OTLP binary protobuf bytes.
 func NewProtobufTracesMarshaler() pdata.TracesMarshaler {
 	return newPbMarshaler()
 }
 
-// NewProtobufMetricsMarshaler returns a model.MetricsMarshaler. Marshals to OTLP binary protobuf bytes.
+// NewProtobufMetricsMarshaler returns a pdata.MetricsMarshaler. Marshals to OTLP binary protobuf bytes.
 func NewProtobufMetricsMarshaler() pdata.MetricsMarshaler {
 	return newPbMarshaler()
 }
 
-// NewProtobufLogsMarshaler returns a model.LogsMarshaler. Marshals to OTLP binary protobuf bytes.
+// NewProtobufLogsMarshaler returns a pdata.LogsMarshaler. Marshals to OTLP binary protobuf bytes.
 func NewProtobufLogsMarshaler() pdata.LogsMarshaler {
 	return newPbMarshaler()
 }
 
+// TODO(#3842): Figure out how we want to represent/return *Sizers.
 type pbMarshaler struct{}
 
 func newPbMarshaler() *pbMarshaler {
 	return &pbMarshaler{}
 }
 
+var _ pdata.TracesSizer = (*pbMarshaler)(nil)
+var _ pdata.MetricsSizer = (*pbMarshaler)(nil)
+var _ pdata.LogsSizer = (*pbMarshaler)(nil)
+
 func (e *pbMarshaler) MarshalLogs(ld pdata.Logs) ([]byte, error) {
 	return internal.LogsToOtlp(ld.InternalRep()).Marshal()
 }
@@ -51,3 +56,15 @@ func (e *pbMarshaler) MarshalMetrics(md pdata.Metrics) ([]byte, error) {
 func (e *pbMarshaler) MarshalTraces(td pdata.Traces) ([]byte, error) {
 	return internal.TracesToOtlp(td.InternalRep()).Marshal()
 }
+
+func (e *pbMarshaler) TracesSize(td pdata.Traces) int {
+	return internal.TracesToOtlp(td.InternalRep()).Size()
+}
+
+func (e *pbMarshaler) MetricsSize(md pdata.Metrics) int {
+	return internal.MetricsToOtlp(md.InternalRep()).Size()
+}
+
+func (e *pbMarshaler) LogsSize(ld pdata.Logs) int {
+	return internal.LogsToOtlp(ld.InternalRep()).Size()
+}

model/otlp/pb_test.go

@@ -42,6 +42,65 @@ func TestProtobufTracesUnmarshaler_error(t *testing.T) {
 	assert.Error(t, err)
 }
 
+func TestProtobufTracesSizer(t *testing.T) {
+	sizer := NewProtobufTracesMarshaler().(pdata.TracesSizer)
+	marshaler := NewProtobufTracesMarshaler()
+	td := pdata.NewTraces()
+	rms := td.ResourceSpans()
+	rms.AppendEmpty().InstrumentationLibrarySpans().AppendEmpty().Spans().AppendEmpty().SetName("foo")
+
+	size := sizer.TracesSize(td)
+
+	bytes, err := marshaler.MarshalTraces(td)
+	require.NoError(t, err)
+	assert.Equal(t, len(bytes), size)
+}
+
+func TestProtobufTracesSizer_withNil(t *testing.T) {
+	sizer := NewProtobufTracesMarshaler().(pdata.TracesSizer)
+
+	assert.Equal(t, 0, sizer.TracesSize(pdata.NewTraces()))
+}
+
+func TestProtobufMetricsSizer(t *testing.T) {
+	sizer := NewProtobufMetricsMarshaler().(pdata.MetricsSizer)
+	marshaler := NewProtobufMetricsMarshaler()
+	md := pdata.NewMetrics()
+	md.ResourceMetrics().AppendEmpty().InstrumentationLibraryMetrics().AppendEmpty().Metrics().AppendEmpty().SetName("foo")
+
+	size := sizer.MetricsSize(md)
+
+	bytes, err := marshaler.MarshalMetrics(md)
+	require.NoError(t, err)
+	assert.Equal(t, len(bytes), size)
+}
+
+func TestProtobufMetricsSizer_withNil(t *testing.T) {
+	sizer := NewProtobufMetricsMarshaler().(pdata.MetricsSizer)
+
+	assert.Equal(t, 0, sizer.MetricsSize(pdata.NewMetrics()))
+}
+
+func TestProtobufLogsSizer(t *testing.T) {
+	sizer := NewProtobufLogsMarshaler().(pdata.LogsSizer)
+	marshaler := NewProtobufLogsMarshaler()
+	ld := pdata.NewLogs()
+	ld.ResourceLogs().AppendEmpty().InstrumentationLibraryLogs().AppendEmpty().Logs().AppendEmpty().SetName("foo")
+
+	size := sizer.LogsSize(ld)
+
+	bytes, err := marshaler.MarshalLogs(ld)
+	require.NoError(t, err)
+	assert.Equal(t, len(bytes), size)
+
+}
+
+func TestProtobufLogsSizer_withNil(t *testing.T) {
+	sizer := NewProtobufLogsMarshaler().(pdata.LogsSizer)
+
+	assert.Equal(t, 0, sizer.LogsSize(pdata.NewLogs()))
+}
+
 func BenchmarkLogsToProtobuf(b *testing.B) {
 	marshaler := NewProtobufLogsMarshaler()
 	logs := generateBenchmarkLogs(128)

model/pdata/logs.go

@@ -24,7 +24,7 @@ import (
 type LogsMarshaler interface {
 	// MarshalLogs the given pdata.Logs into bytes.
 	// If the error is not nil, the returned bytes slice cannot be used.
-	MarshalLogs(td Logs) ([]byte, error)
+	MarshalLogs(ld Logs) ([]byte, error)
 }
 
 // LogsUnmarshaler unmarshalls bytes into pdata.Logs.
@@ -34,6 +34,12 @@ type LogsUnmarshaler interface {
 	UnmarshalLogs(buf []byte) (Logs, error)
 }
 
+// LogsSizer returns the size of a Logs.
+type LogsSizer interface {
+	// LogsSize returns the size in bytes of a Logs.
+	LogsSize(ld Logs) int
+}
+
 // Logs is the top-level struct that is propagated through the logs pipeline.
 //
 // This is a reference type (like builtin map).
@@ -85,12 +91,6 @@ func (ld Logs) LogRecordCount() int {
 	return logCount
 }
 
-// OtlpProtoSize returns the size in bytes of this Logs encoded as OTLP Collector
-// ExportLogsServiceRequest ProtoBuf bytes.
-func (ld Logs) OtlpProtoSize() int {
-	return ld.orig.Size()
-}
-
 // ResourceLogs returns the ResourceLogsSlice associated with this Logs.
 func (ld Logs) ResourceLogs() ResourceLogsSlice {
 	return newResourceLogsSlice(&ld.orig.ResourceLogs)

model/pdata/metrics.go

@@ -24,7 +24,7 @@ import (
 type MetricsMarshaler interface {
 	// MarshalMetrics the given pdata.Metrics into bytes.
 	// If the error is not nil, the returned bytes slice cannot be used.
-	MarshalMetrics(td Metrics) ([]byte, error)
+	MarshalMetrics(md Metrics) ([]byte, error)
 }
 
 // MetricsUnmarshaler unmarshalls bytes into pdata.Metrics.
@@ -34,6 +34,12 @@ type MetricsUnmarshaler interface {
 	UnmarshalMetrics(buf []byte) (Metrics, error)
 }
 
+// MetricsSizer returns the size of a Metrics.
+type MetricsSizer interface {
+	// LogsSize returns the size in bytes of a Metrics.
+	MetricsSize(md Metrics) int
+}
+
 // Metrics is an opaque interface that allows transition to the new internal Metrics data, but also facilitates the
 // transition to the new components, especially for traces.
 //
@@ -87,12 +93,6 @@ func (md Metrics) MetricCount() int {
 	return metricCount
 }
 
-// OtlpProtoSize returns the size in bytes of this Metrics encoded as OTLP Collector
-// ExportMetricsServiceRequest ProtoBuf bytes.
-func (md Metrics) OtlpProtoSize() int {
-	return md.orig.Size()
-}
-
 // DataPointCount calculates the total number of data points.
 func (md Metrics) DataPointCount() (dataPointCount int) {
 	rms := md.ResourceMetrics()

model/pdata/metrics_test.go

@@ -19,7 +19,6 @@ import (
 
 	gogoproto "github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	goproto "google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/emptypb"
 
@@ -148,22 +147,6 @@ func TestMetricCount(t *testing.T) {
 	assert.EqualValues(t, 6, md.MetricCount())
 }
 
-func TestMetricsSize(t *testing.T) {
-	assert.Equal(t, 0, NewMetrics().OtlpProtoSize())
-
-	md := generateMetricsEmptyDataPoints()
-	orig := md.orig
-	size := orig.Size()
-	bytes, err := orig.Marshal()
-	require.NoError(t, err)
-	assert.Equal(t, size, md.OtlpProtoSize())
-	assert.Equal(t, len(bytes), md.OtlpProtoSize())
-}
-
-func TestMetricsSizeWithNil(t *testing.T) {
-	assert.Equal(t, 0, NewMetrics().OtlpProtoSize())
-}
-
 func TestMetricCountWithEmpty(t *testing.T) {
 	assert.EqualValues(t, 0, generateMetricsEmptyResource().MetricCount())
 	assert.EqualValues(t, 0, generateMetricsEmptyInstrumentation().MetricCount())

model/pdata/traces.go

@@ -34,6 +34,12 @@ type TracesUnmarshaler interface {
 	UnmarshalTraces(buf []byte) (Traces, error)
 }
 
+// TracesSizer returns the size of a Traces.
+type TracesSizer interface {
+	// TracesSize returns the size in bytes of a Traces.
+	TracesSize(td Traces) int
+}
+
 // Traces is the top-level struct that is propagated through the traces pipeline.
 type Traces struct {
 	orig *otlpcollectortrace.ExportTraceServiceRequest
@@ -77,12 +83,6 @@ func (td Traces) SpanCount() int {
 	return spanCount
 }
 
-// OtlpProtoSize returns the size in bytes of this Traces encoded as OTLP Collector
-// ExportTraceServiceRequest ProtoBuf bytes.
-func (td Traces) OtlpProtoSize() int {
-	return td.orig.Size()
-}
-
 // ResourceSpans returns the ResourceSpansSlice associated with this Metrics.
 func (td Traces) ResourceSpans() ResourceSpansSlice {
 	return newResourceSpansSlice(&td.orig.ResourceSpans)

model/pdata/traces_test.go

@@ -19,7 +19,6 @@ import (
 
 	gogoproto "github.com/gogo/protobuf/proto"
 	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	goproto "google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/emptypb"
 
@@ -52,23 +51,6 @@ func TestSpanCount(t *testing.T) {
 	assert.EqualValues(t, 6, md.SpanCount())
 }
 
-func TestTracesSize(t *testing.T) {
-	assert.Equal(t, 0, NewTraces().OtlpProtoSize())
-	td := NewTraces()
-	rms := td.ResourceSpans()
-	rms.AppendEmpty().InstrumentationLibrarySpans().AppendEmpty().Spans().AppendEmpty().SetName("foo")
-	orig := td.orig
-	size := orig.Size()
-	bytes, err := orig.Marshal()
-	require.NoError(t, err)
-	assert.Equal(t, size, td.OtlpProtoSize())
-	assert.Equal(t, len(bytes), td.OtlpProtoSize())
-}
-
-func TestTracesSizeWithNil(t *testing.T) {
-	assert.Equal(t, 0, NewTraces().OtlpProtoSize())
-}
-
 func TestSpanCountWithEmpty(t *testing.T) {
 	assert.EqualValues(t, 0, Traces{orig: &otlpcollectortrace.ExportTraceServiceRequest{
 		ResourceSpans: []*otlptrace.ResourceSpans{{}},

processor/batchprocessor/batch_processor.go

@@ -27,6 +27,7 @@ import (
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/config/configtelemetry"
 	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/model/otlp"
 	"go.opentelemetry.io/collector/model/pdata"
 )
 
@@ -223,10 +224,11 @@ type batchTraces struct {
 	nextConsumer consumer.Traces
 	traceData    pdata.Traces
 	spanCount    int
+	sizer        pdata.TracesSizer
 }
 
 func newBatchTraces(nextConsumer consumer.Traces) *batchTraces {
-	return &batchTraces{nextConsumer: nextConsumer, traceData: pdata.NewTraces()}
+	return &batchTraces{nextConsumer: nextConsumer, traceData: pdata.NewTraces(), sizer: otlp.NewProtobufTracesMarshaler().(pdata.TracesSizer)}
 }
 
 // add updates current batchTraces by adding new TraceData object
@@ -259,17 +261,18 @@ func (bt *batchTraces) itemCount() int {
 }
 
 func (bt *batchTraces) size() int {
-	return bt.traceData.OtlpProtoSize()
+	return bt.sizer.TracesSize(bt.traceData)
 }
 
 type batchMetrics struct {
 	nextConsumer   consumer.Metrics
 	metricData     pdata.Metrics
 	dataPointCount int
+	sizer          pdata.MetricsSizer
 }
 
 func newBatchMetrics(nextConsumer consumer.Metrics) *batchMetrics {
-	return &batchMetrics{nextConsumer: nextConsumer, metricData: pdata.NewMetrics()}
+	return &batchMetrics{nextConsumer: nextConsumer, metricData: pdata.NewMetrics(), sizer: otlp.NewProtobufMetricsMarshaler().(pdata.MetricsSizer)}
 }
 
 func (bm *batchMetrics) export(ctx context.Context, sendBatchMaxSize int) error {
@@ -290,7 +293,7 @@ func (bm *batchMetrics) itemCount() int {
 }
 
 func (bm *batchMetrics) size() int {
-	return bm.metricData.OtlpProtoSize()
+	return bm.sizer.MetricsSize(bm.metricData)
 }
 
 func (bm *batchMetrics) add(item interface{}) {
@@ -308,10 +311,11 @@ type batchLogs struct {
 	nextConsumer consumer.Logs
 	logData      pdata.Logs
 	logCount     int
+	sizer        pdata.LogsSizer
 }
 
 func newBatchLogs(nextConsumer consumer.Logs) *batchLogs {
-	return &batchLogs{nextConsumer: nextConsumer, logData: pdata.NewLogs()}
+	return &batchLogs{nextConsumer: nextConsumer, logData: pdata.NewLogs(), sizer: otlp.NewProtobufLogsMarshaler().(pdata.LogsSizer)}
 }
 
 func (bl *batchLogs) export(ctx context.Context, sendBatchMaxSize int) error {
@@ -332,7 +336,7 @@ func (bl *batchLogs) itemCount() int {
 }
 
 func (bl *batchLogs) size() int {
-	return bl.logData.OtlpProtoSize()
+	return bl.sizer.LogsSize(bl.logData)
 }
 
 func (bl *batchLogs) add(item interface{}) {