Add OTLP write handler benchmark

pkg/util/push/otlp_test.go

@@ -220,133 +220,240 @@ func TestOTLPConvertToPromTS(t *testing.T) {
 	}
 }
 
+// for testing
+type resetReader struct {
+	*bytes.Reader
+	body []byte
+}
+
+func newResetReader(body []byte) *resetReader {
+	return &resetReader{
+		Reader: bytes.NewReader(body),
+		body:   body,
+	}
+}
+
+func (r *resetReader) Reset() {
+	r.Reader.Reset(r.body)
+}
+
+func (r *resetReader) Close() error {
+	return nil
+}
+
+func getOTLPHttpRequest(otlpRequest *pmetricotlp.ExportRequest, contentType, encodingType string) (*http.Request, error) {
+	ctx := context.Background()
+	ctx = user.InjectOrgID(ctx, "user-1")
+
+	var body []byte
+	var err error
+	switch contentType {
+	case jsonContentType:
+		body, err = otlpRequest.MarshalJSON()
+		if err != nil {
+			return nil, err
+		}
+	case pbContentType:
+		body, err = otlpRequest.MarshalProto()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if encodingType == "gzip" {
+		var gzipBody bytes.Buffer
+		gz := gzip.NewWriter(&gzipBody)
+		_, err = gz.Write(body)
+		if err != nil {
+			return nil, err
+		}
+		if err = gz.Close(); err != nil {
+			return nil, err
+		}
+		body = gzipBody.Bytes()
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "", "", newResetReader(body))
+	if err != nil {
+		return nil, err
+	}
+
+	switch contentType {
+	case jsonContentType:
+		req.Header.Set("Content-Type", jsonContentType)
+	case pbContentType:
+		req.Header.Set("Content-Type", pbContentType)
+	}
+
+	if encodingType != "" {
+		req.Header.Set("Content-Encoding", encodingType)
+	}
+	req.ContentLength = int64(len(body))
+
+	return req, nil
+}
+
+func BenchmarkOTLPWriteHandler(b *testing.B) {
+	cfg := distributor.OTLPConfig{
+		ConvertAllAttributes: false,
+		DisableTargetInfo:    false,
+	}
+	overrides, err := validation.NewOverrides(querier.DefaultLimitsConfig(), nil)
+	require.NoError(b, err)
+
+	exportRequest := generateOTLPWriteRequest()
+	mockPushFunc := func(context.Context, *cortexpb.WriteRequest) (*cortexpb.WriteResponse, error) {
+		return &cortexpb.WriteResponse{}, nil
+	}
+	handler := OTLPHandler(10000, overrides, cfg, nil, mockPushFunc)
+
+	b.Run("json with no compression", func(b *testing.B) {
+		req, err := getOTLPHttpRequest(&exportRequest, jsonContentType, "")
+		require.NoError(b, err)
+
+		b.ResetTimer()
+		b.ReportAllocs()
+		for i := 0; i < b.N; i++ {
+			recorder := httptest.NewRecorder()
+			handler.ServeHTTP(recorder, req)
+
+			resp := recorder.Result()
+			require.Equal(b, http.StatusOK, resp.StatusCode)
+			req.Body.(*resetReader).Reset()
+		}
+	})
+	b.Run("json with gzip", func(b *testing.B) {
+		req, err := getOTLPHttpRequest(&exportRequest, jsonContentType, "gzip")
+		require.NoError(b, err)
+
+		b.ResetTimer()
+		b.ReportAllocs()
+		for i := 0; i < b.N; i++ {
+			recorder := httptest.NewRecorder()
+			handler.ServeHTTP(recorder, req)
+
+			resp := recorder.Result()
+			require.Equal(b, http.StatusOK, resp.StatusCode)
+			req.Body.(*resetReader).Reset()
+		}
+	})
+	b.Run("proto with no compression", func(b *testing.B) {
+		req, err := getOTLPHttpRequest(&exportRequest, pbContentType, "")
+		require.NoError(b, err)
+
+		b.ResetTimer()
+		b.ReportAllocs()
+		for i := 0; i < b.N; i++ {
+			recorder := httptest.NewRecorder()
+			handler.ServeHTTP(recorder, req)
+
+			resp := recorder.Result()
+			require.Equal(b, http.StatusOK, resp.StatusCode)
+			req.Body.(*resetReader).Reset()
+		}
+	})
+	b.Run("proto with gzip", func(b *testing.B) {
+		req, err := getOTLPHttpRequest(&exportRequest, pbContentType, "gzip")
+		require.NoError(b, err)
+
+		b.ResetTimer()
+		b.ReportAllocs()
+		for i := 0; i < b.N; i++ {
+			recorder := httptest.NewRecorder()
+			handler.ServeHTTP(recorder, req)
+
+			resp := recorder.Result()
+			require.Equal(b, http.StatusOK, resp.StatusCode)
+			req.Body.(*resetReader).Reset()
+		}
+	})
+}
+
 func TestOTLPWriteHandler(t *testing.T) {
 	cfg := distributor.OTLPConfig{
 		ConvertAllAttributes: false,
 		DisableTargetInfo:    false,
 	}
 
-	exportRequest := generateOTLPWriteRequest(t)
+	exportRequest := generateOTLPWriteRequest()
 
 	tests := []struct {
 		description        string
 		maxRecvMsgSize     int
-		format             string
+		contentType        string
 		expectedStatusCode int
 		expectedErrMsg     string
-		gzipCompression    bool
 		encodingType       string
 	}{
 		{
 			description:        "Test proto format write with no compression",
 			maxRecvMsgSize:     10000,
-			format:             pbContentType,
+			contentType:        pbContentType,
 			expectedStatusCode: http.StatusOK,
 		},
 		{
 			description:        "Test proto format write with gzip",
 			maxRecvMsgSize:     10000,
-			format:             pbContentType,
+			contentType:        pbContentType,
 			expectedStatusCode: http.StatusOK,
 			encodingType:       "gzip",
-			gzipCompression:    true,
 		},
 		{
 			description:        "Test json format write with no compression",
 			maxRecvMsgSize:     10000,
-			format:             jsonContentType,
+			contentType:        jsonContentType,
 			expectedStatusCode: http.StatusOK,
 		},
 		{
 			description:        "Test json format write with gzip",
 			maxRecvMsgSize:     10000,
-			format:             jsonContentType,
+			contentType:        jsonContentType,
 			expectedStatusCode: http.StatusOK,
 			encodingType:       "gzip",
-			gzipCompression:    true,
 		},
 		{
 			description:        "request too big than maxRecvMsgSize (proto) with no compression",
 			maxRecvMsgSize:     10,
-			format:             pbContentType,
+			contentType:        pbContentType,
 			expectedStatusCode: http.StatusBadRequest,
 			expectedErrMsg:     "received message larger than max",
 		},
 		{
 			description:        "request too big than maxRecvMsgSize (proto) with gzip",
 			maxRecvMsgSize:     10,
-			format:             pbContentType,
+			contentType:        pbContentType,
 			expectedStatusCode: http.StatusBadRequest,
 			expectedErrMsg:     "received message larger than max",
 			encodingType:       "gzip",
-			gzipCompression:    true,
 		},
 		{
 			description:        "request too big than maxRecvMsgSize (json) with no compression",
 			maxRecvMsgSize:     10,
-			format:             jsonContentType,
+			contentType:        jsonContentType,
 			expectedStatusCode: http.StatusBadRequest,
 			expectedErrMsg:     "received message larger than max",
 		},
 		{
 			description:        "request too big than maxRecvMsgSize (json) with gzip",
 			maxRecvMsgSize:     10,
-			format:             jsonContentType,
+			contentType:        jsonContentType,
 			expectedStatusCode: http.StatusBadRequest,
 			expectedErrMsg:     "received message larger than max",
 			encodingType:       "gzip",
-			gzipCompression:    true,
 		},
 		{
 			description:        "invalid encoding type: snappy",
 			maxRecvMsgSize:     10000,
-			format:             jsonContentType,
+			contentType:        jsonContentType,
 			expectedStatusCode: http.StatusBadRequest,
 			encodingType:       "snappy",
 		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.description, func(t *testing.T) {
-			ctx := context.Background()
-			ctx = user.InjectOrgID(ctx, "user-1")
-			var req *http.Request
-
-			compressionFunc := func(t *testing.T, body []byte) []byte {
-				var b bytes.Buffer
-				gz := gzip.NewWriter(&b)
-				_, err := gz.Write(body)
-				require.NoError(t, err)
-				require.NoError(t, gz.Close())
-
-				return b.Bytes()
-			}
-
-			if test.format == pbContentType {
-				buf, err := exportRequest.MarshalProto()
-				require.NoError(t, err)
-
-				if test.gzipCompression {
-					buf = compressionFunc(t, buf)
-				}
-
-				req, err = http.NewRequestWithContext(ctx, "", "", bytes.NewReader(buf))
-				require.NoError(t, err)
-				req.Header.Set("Content-Type", pbContentType)
-				req.Header.Set("Content-Encoding", test.encodingType)
-			} else {
-				buf, err := exportRequest.MarshalJSON()
-				require.NoError(t, err)
-
-				if test.gzipCompression {
-					buf = compressionFunc(t, buf)
-				}
-
-				req, err = http.NewRequestWithContext(ctx, "", "", bytes.NewReader(buf))
-				require.NoError(t, err)
-				req.Header.Set("Content-Type", jsonContentType)
-				req.Header.Set("Content-Encoding", test.encodingType)
-			}
+			req, err := getOTLPHttpRequest(&exportRequest, test.contentType, test.encodingType)
+			require.NoError(t, err)
 
 			push := verifyOTLPWriteRequestHandler(t, cortexpb.API)
 			overrides, err := validation.NewOverrides(querier.DefaultLimitsConfig(), nil)
@@ -368,7 +475,7 @@ func TestOTLPWriteHandler(t *testing.T) {
 	}
 }
 
-func generateOTLPWriteRequest(t *testing.T) pmetricotlp.ExportRequest {
+func generateOTLPWriteRequest() pmetricotlp.ExportRequest {
 	d := pmetric.NewMetrics()
 
 	// Generate One Counter, One Gauge, One Histogram, One Exponential-Histogram