enhance: RESTFUL search api support range search (#29055)

issue: #29004

add a new parameter: `params`, which is a map[string]float64;
but now only 2 valid item: radius + range_filter;

Signed-off-by: PowderLi <min.li@zilliz.com>

internal/distributed/proxy/httpserver/constant.go

@@ -54,5 +54,7 @@ const (
 	ParamRoundDecimal = "round_decimal"
 	ParamOffset       = "offset"
 	ParamLimit        = "limit"
+	ParamRadius       = "radius"
+	ParamRangeFilter  = "range_filter"
 	BoundedTimestamp  = 2
 )

internal/distributed/proxy/httpserver/handler_v1.go

@@ -862,6 +862,24 @@ func (h *Handlers) search(c *gin.Context) {
 	params := map[string]interface{}{ // auto generated mapping
 		"level": int(commonpb.ConsistencyLevel_Bounded),
 	}
+	if httpReq.Params != nil {
+		radius, radiusOk := httpReq.Params[ParamRadius]
+		rangeFilter, rangeFilterOk := httpReq.Params[ParamRangeFilter]
+		if rangeFilterOk {
+			if !radiusOk {
+				log.Warn("high level restful api, search params invalid, because only " + ParamRangeFilter)
+				c.AbortWithStatusJSON(http.StatusOK, gin.H{
+					HTTPReturnCode:    merr.Code(merr.ErrIncorrectParameterFormat),
+					HTTPReturnMessage: merr.ErrIncorrectParameterFormat.Error() + ", error: invalid search params",
+				})
+				return
+			}
+			params[ParamRangeFilter] = rangeFilter
+		}
+		if radiusOk {
+			params[ParamRadius] = radius
+		}
+	}
 	bs, _ := json.Marshal(params)
 	searchParams := []*commonpb.KeyValuePair{
 		{Key: common.TopKKey, Value: strconv.FormatInt(int64(httpReq.Limit), 10)},

internal/distributed/proxy/httpserver/handler_v1_test.go

@@ -1294,6 +1294,38 @@ func TestSearch(t *testing.T) {
 			}
 		})
 	}
+	mp := mocks.NewMockProxy(t)
+	mp.EXPECT().Search(mock.Anything, mock.Anything).Return(&milvuspb.SearchResults{
+		Status: &StatusSuccess,
+		Results: &schemapb.SearchResultData{
+			FieldsData: generateFieldData(),
+			Scores:     []float32{0.01, 0.04, 0.09},
+			TopK:       3,
+		},
+	}, nil).Once()
+	tt := testCase{
+		name:       "search success with params",
+		mp:         mp,
+		exceptCode: 200,
+	}
+	t.Run(tt.name, func(t *testing.T) {
+		testEngine := initHTTPServer(tt.mp, true)
+		rows := []float32{0.0, 0.0}
+		data, _ := json.Marshal(map[string]interface{}{
+			HTTPCollectionName: DefaultCollectionName,
+			"vector":           rows,
+			Params: map[string]float64{
+				ParamRadius:      0.9,
+				ParamRangeFilter: 0.1,
+			},
+		})
+		bodyReader := bytes.NewReader(data)
+		req := httptest.NewRequest(http.MethodPost, versional(VectorSearchPath), bodyReader)
+		req.SetBasicAuth(util.UserRoot, util.DefaultRootPassword)
+		w := httptest.NewRecorder()
+		testEngine.ServeHTTP(w, req)
+		assert.Equal(t, tt.exceptCode, w.Code)
+	})
 }
 
 type ReturnType int
@@ -1405,12 +1437,14 @@ func TestHttpRequestFormat(t *testing.T) {
 		merr.ErrMissingRequiredParameters,
 		merr.ErrMissingRequiredParameters,
 		merr.ErrMissingRequiredParameters,
+		merr.ErrIncorrectParameterFormat,
 	}
 	requestJsons := [][]byte{
 		[]byte(`{"collectionName": {"` + DefaultCollectionName + `", "dimension": 2}`),
 		[]byte(`{"collName": "` + DefaultCollectionName + `", "dimension": 2}`),
 		[]byte(`{"collName": "` + DefaultCollectionName + `", "dim": 2}`),
 		[]byte(`{"collectionName": "` + DefaultCollectionName + `"}`),
+		[]byte(`{"collectionName": "` + DefaultCollectionName + `", "vector": [0.0, 0.0], "` + Params + `": {"` + ParamRangeFilter + `": 0.1}}`),
 	}
 	paths := [][]string{
 		{
@@ -1439,6 +1473,8 @@ func TestHttpRequestFormat(t *testing.T) {
 			versional(VectorInsertPath),
 			versional(VectorUpsertPath),
 			versional(VectorDeletePath),
+		}, {
+			versional(VectorSearchPath),
 		},
 	}
 	for i, pathArr := range paths {

internal/distributed/proxy/httpserver/request.go

@@ -63,11 +63,12 @@ type SingleUpsertReq struct {
 }
 
 type SearchReq struct {
-	DbName         string    `json:"dbName"`
-	CollectionName string    `json:"collectionName" validate:"required"`
-	Filter         string    `json:"filter"`
-	Limit          int32     `json:"limit"`
-	Offset         int32     `json:"offset"`
-	OutputFields   []string  `json:"outputFields"`
-	Vector         []float32 `json:"vector"`
+	DbName         string             `json:"dbName"`
+	CollectionName string             `json:"collectionName" validate:"required"`
+	Filter         string             `json:"filter"`
+	Limit          int32              `json:"limit"`
+	Offset         int32              `json:"offset"`
+	OutputFields   []string           `json:"outputFields"`
+	Vector         []float32          `json:"vector"`
+	Params         map[string]float64 `json:"params"`
 }