2 improvement: Make time property optional

docker-compose.yaml

@@ -10,6 +10,8 @@ services:
         grafana_version: ${GRAFANA_VERSION:-10.2.0}
     ports:
       - 3000:3000/tcp
+    environment:
+      GF_LOG_LEVEL: 'debug'
     volumes:
       - ./dist:/var/lib/grafana/plugins/dvelop-odata-datasource
       - ./provisioning:/etc/grafana/provisioning

pkg/plugin/client.go

@@ -6,16 +6,15 @@ import (
 	"net/url"
 	"path"
 	"strings"
-	"time"
 
 	"github.com/d-velop/grafana-odata-datasource/pkg/plugin/odata"
-	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
 )
 
 type ODataClient interface {
 	GetServiceRoot() (*http.Response, error)
 	GetMetadata() (*http.Response, error)
-	Get(entitySet string, properties []property, timeProperty string, timeRange backend.TimeRange,
+	Get(entitySet string, properties []property,
 		filterConditions []filterCondition) (*http.Response, error)
 }
 
@@ -38,29 +37,29 @@ func (client *ODataClientImpl) GetMetadata() (*http.Response, error) {
 	return client.httpClient.Get(requestUrl.String())
 }
 
-func (client *ODataClientImpl) Get(entitySet string, properties []property, timeProperty string,
-	timeRange backend.TimeRange, filterConditions []filterCondition) (*http.Response, error) {
-	requestUrl, err := buildQueryUrl(client.baseUrl, entitySet, properties, timeProperty, timeRange,
+func (client *ODataClientImpl) Get(entitySet string, properties []property, filterConditions []filterCondition) (*http.Response, error) {
+	requestUrl, err := buildQueryUrl(client.baseUrl, entitySet, properties,
 		filterConditions, client.urlSpaceEncoding)
 	if err != nil {
 		return nil, err
 	}
-	return client.httpClient.Get(requestUrl.String())
+	urlString := requestUrl.String()
+	log.DefaultLogger.Debug("Constructed request url: ", urlString)
+	return client.httpClient.Get(urlString)
 }
 
-func buildQueryUrl(baseUrl string, entitySet string, properties []property, timeProperty string,
-	timeRange backend.TimeRange, filterConditions []filterCondition, urlSpaceEncoding string) (*url.URL, error) {
+func buildQueryUrl(baseUrl string, entitySet string, properties []property, filterConditions []filterCondition, urlSpaceEncoding string) (*url.URL, error) {
 	requestUrl, err := url.Parse(baseUrl)
 	if err != nil {
 		return nil, err
 	}
 	requestUrl.Path = path.Join(requestUrl.Path, entitySet)
 	params, _ := url.ParseQuery(requestUrl.RawQuery)
-	filterParam := mapFilter(timeProperty, timeRange, filterConditions)
+	filterParam := mapFilter(filterConditions)
 	if len(filterParam) > 0 {
 		params.Add(odata.Filter, filterParam)
 	}
-	selectParam := mapSelect(properties, timeProperty)
+	selectParam := mapSelect(properties)
 	if len(selectParam) > 0 {
 		params.Add(odata.Select, selectParam)
 	}
@@ -72,25 +71,17 @@ func buildQueryUrl(baseUrl string, entitySet string, properties []property, time
 	return requestUrl, nil
 }
 
-func mapSelect(properties []property, timeProperty string) string {
+func mapSelect(properties []property) string {
 	var result []string
 	if len(properties) > 0 {
 		for _, selectProp := range properties {
 			result = append(result, selectProp.Name)
 		}
 	}
-	if len(timeProperty) > 0 {
-		result = append(result, timeProperty)
-	}
 	return strings.Join(result[:], ",")
 }
 
-func mapFilter(timeProperty string, timeRange backend.TimeRange, filterConditions []filterCondition) string {
-	var filter string
-	if len(timeProperty) > 0 {
-		filter = fmt.Sprintf("%s ge %s and %s le %s", timeProperty, timeRange.From.UTC().Format(time.RFC3339),
-			timeProperty, timeRange.To.UTC().Format(time.RFC3339))
-	}
+func mapFilter(filterConditions []filterCondition) string {
 	var customFilter = ""
 	for index, element := range filterConditions {
 		if element.Property.Type == odata.EdmString {
@@ -102,8 +93,6 @@ func mapFilter(timeProperty string, timeRange backend.TimeRange, filterCondition
 			customFilter += " and "
 		}
 	}
-	if len(customFilter) > 0 {
-		filter += " and " + customFilter
-	}
-	return filter
+
+	return customFilter
 }

pkg/plugin/client_query_test.go

@@ -7,50 +7,51 @@ import (
 	"time"
 
 	"github.com/d-velop/grafana-odata-datasource/pkg/plugin/odata"
-	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestMapFilter(t *testing.T) {
 	tables := []struct {
 		name             string
-		timeProperty     string
-		timeRange        backend.TimeRange
 		filterConditions []filterCondition
 		expected         string
 	}{
 		{
-			name:             "Time filter only",
-			timeProperty:     "time",
-			timeRange:        aOneDayTimeRange(),
-			filterConditions: someFilterConditions(int32Eq5),
-			expected:         "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and int32 eq 5",
+			name: "Time filter only",
+			filterConditions: someFilterConditions(
+				withFilterCondition(timeProp, "ge", aOneDayTimeRange().From.Format(time.RFC3339)),
+				withFilterCondition(timeProp, "le", aOneDayTimeRange().To.Format(time.RFC3339)),
+				int32Eq5),
+			expected: "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and int32 eq 5",
 		},
 		{
-			name:             "Time filter and int and string filter",
-			timeProperty:     "time",
-			timeRange:        aOneDayTimeRange(),
-			filterConditions: someFilterConditions(int32Eq5, withFilterCondition(stringProp, "eq", "Hello")),
-			expected:         "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and int32 eq 5 and string eq 'Hello'",
+			name: "Time filter and int and string filter",
+			filterConditions: someFilterConditions(
+				withFilterCondition(timeProp, "ge", aOneDayTimeRange().From.Format(time.RFC3339)),
+				withFilterCondition(timeProp, "le", aOneDayTimeRange().To.Format(time.RFC3339)),
+				int32Eq5,
+				withFilterCondition(stringProp, "eq", "Hello")),
+			expected: "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and int32 eq 5 and string eq 'Hello'",
 		},
 		{
-			name:             "Time filter and string filter",
-			timeProperty:     "time",
-			timeRange:        aOneDayTimeRange(),
-			filterConditions: someFilterConditions(withFilterCondition(stringProp, "eq", "")),
-			expected:         "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and string eq ''",
+			name: "Time filter and string filter",
+			filterConditions: someFilterConditions(
+				withFilterCondition(timeProp, "ge", aOneDayTimeRange().From.Format(time.RFC3339)),
+				withFilterCondition(timeProp, "le", aOneDayTimeRange().To.Format(time.RFC3339)),
+				withFilterCondition(stringProp, "eq", "")),
+			expected: "time ge 2022-04-21T12:30:50Z and time le 2022-04-21T12:30:50Z and string eq ''",
 		},
 		{
 			name:             "String filter only",
 			filterConditions: someFilterConditions(withFilterCondition(stringProp, "eq", "")),
-			expected:         " and string eq ''",
+			expected:         "string eq ''",
 		},
 	}
 
 	for _, table := range tables {
 		t.Run(table.name, func(t *testing.T) {
 			// Act
-			var filterString = mapFilter(table.timeProperty, table.timeRange, table.filterConditions)
+			var filterString = mapFilter(table.filterConditions)
 
 			// Assert
 			assert.Equal(t, table.expected, filterString)
@@ -65,27 +66,27 @@ func TestBuildQueryUrl(t *testing.T) {
 		entitySet        string
 		properties       []property
 		timeProperty     string
-		timeRange        backend.TimeRange
+		timeRange        []filterCondition
 		filterConditions []filterCondition
 		expected         string
 	}{
 		{
-			name:             "Success",
-			baseUrl:          "http://localhost:5000",
-			entitySet:        "Temperatures",
-			properties:       []property{aProperty(int32Prop)},
-			timeProperty:     "time",
-			timeRange:        aOneDayTimeRange(),
-			filterConditions: someFilterConditions(withFilterCondition(stringProp, "eq", "")),
-			expected:         "http://localhost:5000/Temperatures?%24filter=time+ge+2022-04-21T12%3A30%3A50Z+and+time+le+2022-04-21T12%3A30%3A50Z+and+string+eq+%27%27&%24select=int32%2Ctime",
+			name:       "Success",
+			baseUrl:    "http://localhost:5000",
+			entitySet:  "Temperatures",
+			properties: []property{aProperty(int32Prop), aProperty(timeProp)},
+			filterConditions: someFilterConditions(
+				withFilterCondition(timeProp, "ge", aOneDayTimeRange().From.Format(time.RFC3339)),
+				withFilterCondition(timeProp, "le", aOneDayTimeRange().To.Format(time.RFC3339)),
+				withFilterCondition(stringProp, "eq", "")),
+			expected: "http://localhost:5000/Temperatures?%24filter=time+ge+2022-04-21T12%3A30%3A50Z+and+time+le+2022-04-21T12%3A30%3A50Z+and+string+eq+%27%27&%24select=int32%2Ctime",
 		},
 	}
 
 	for _, table := range tables {
 		t.Run(table.name, func(t *testing.T) {
 			// Act
-			var builtUrl, err = buildQueryUrl(table.baseUrl, table.entitySet, table.properties, table.timeProperty,
-				table.timeRange, table.filterConditions, "+")
+			var builtUrl, err = buildQueryUrl(table.baseUrl, table.entitySet, table.properties, table.filterConditions, "+")
 
 			// Assert
 			assert.NoError(t, err)
@@ -131,7 +132,7 @@ func TestGetEntities(t *testing.T) {
 			client := GetOC("*", table.handlerCallback)
 
 			// Act
-			resp, err := client.Get("Temperatures", []property{aProperty(int32Prop)}, "time", aOneDayTimeRange(), someFilterConditions(int32Eq5))
+			resp, err := client.Get("Temperatures", []property{aProperty(int32Prop)}, someFilterConditions(int32Eq5))
 
 			// Assert
 			if table.expectedError == nil {

pkg/plugin/datasource.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"time"
 
 	"github.com/d-velop/grafana-odata-datasource/pkg/plugin/odata"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
@@ -130,27 +129,34 @@ func (ds *ODataSource) query(clientInstance ODataClient, query backend.DataQuery
 		return response
 	}
 
-	timeProperty := qm.TimeProperty.Name
+	// Prevent empty queries from being executed
+	if qm.TimeProperty == nil && len(qm.Properties) == 0 {
+		return response
+	}
+
 	frame := data.NewFrame("response")
 	frame.Name = query.RefID
 	if frame.Meta == nil {
 		frame.Meta = &data.FrameMeta{}
 	}
 	frame.Meta.PreferredVisualization = data.VisTypeTable
-	labels, err := data.LabelsFromString("time=" + timeProperty)
-	if err != nil {
-		response.Error = err
-		return response
+
+	if qm.TimeProperty != nil {
+		log.DefaultLogger.Debug("Time property configured", "name", qm.TimeProperty.Name)
+		field := data.NewField(qm.TimeProperty.Name, nil, odata.ToArray(qm.TimeProperty.Type))
+		frame.Fields = append(frame.Fields, field)
 	}
-	frame.Fields = append(frame.Fields,
-		data.NewField("time", labels, []*time.Time{}),
-	)
 	for _, prop := range qm.Properties {
-		frame.Fields = append(frame.Fields, data.NewField(prop.Name, nil, odata.ToArray(prop.Type)))
+		field := data.NewField(prop.Name, nil, odata.ToArray(prop.Type))
+		frame.Fields = append(frame.Fields, field)
 	}
 
-	resp, err := clientInstance.Get(qm.EntitySet.Name, qm.Properties, timeProperty,
-		query.TimeRange, qm.FilterConditions)
+	props := qm.Properties
+	if qm.TimeProperty != nil {
+		props = append(props, *qm.TimeProperty)
+	}
+	resp, err := clientInstance.Get(qm.EntitySet.Name, props,
+		append(qm.FilterConditions, BackendTimeRangeToODataFilter(query.TimeRange, qm.TimeProperty)...))
 	if err != nil {
 		response.Error = err
 		return response
@@ -178,17 +184,17 @@ func (ds *ODataSource) query(clientInstance ODataClient, query backend.DataQuery
 	log.DefaultLogger.Debug("query complete", "noOfEntities", len(result.Value))
 
 	for _, entry := range result.Value {
-		values := make([]interface{}, len(qm.Properties)+1)
-		if timeValue, err := time.Parse(time.RFC3339Nano, fmt.Sprint(entry[timeProperty])); err == nil {
-			values[0] = &timeValue
-		} else {
-			values[0] = nil
+		values := make([]interface{}, 0)
+
+		if qm.TimeProperty != nil {
+			values = append(values, odata.MapValue(entry[qm.TimeProperty.Name], qm.TimeProperty.Type))
 		}
-		for i, prop := range qm.Properties {
+
+		for _, prop := range qm.Properties {
 			if value, ok := entry[prop.Name]; ok {
-				values[i+1] = odata.MapValue(value, prop.Type)
+				values = append(values, odata.MapValue(value, prop.Type))
 			} else {
-				values[i+1] = nil
+				values = append(values, nil)
 			}
 		}
 		frame.AppendRow(values...)