fix(influxdb): add default operator

ref #6523

pkg/tsdb/influxdb/query_builder.go

@@ -5,9 +5,15 @@ import (
 	"strconv"
 	"strings"
 
+	"regexp"
+
 	"github.com/grafana/grafana/pkg/tsdb"
 )
 
+var (
+	regexpOperatorPattern *regexp.Regexp = regexp.MustCompile(`^\/.*\/$`)
+)
+
 type QueryBuilder struct{}
 
 func (qb *QueryBuilder) Build(query *Query, queryContext *tsdb.QueryContext) (string, error) {
@@ -43,18 +49,28 @@ func (qb *QueryBuilder) renderTags(query *Query) []string {
 			str += " "
 		}
 
-		value := tag.Value
-		nValue, err := strconv.ParseFloat(tag.Value, 64)
+		//If the operator is missing we fall back to sensible defaults
+		if tag.Operator == "" {
+			if regexpOperatorPattern.Match([]byte(tag.Value)) {
+				tag.Operator = "=~"
+			} else {
+				tag.Operator = "="
+			}
+		}
+
+		textValue := ""
+		numericValue, err := strconv.ParseFloat(tag.Value, 64)
 
+		// quote value unless regex or number
 		if tag.Operator == "=~" || tag.Operator == "!~" {
-			value = fmt.Sprintf("%s", value)
+			textValue = tag.Value
 		} else if err == nil {
-			value = fmt.Sprintf("%v", nValue)
+			textValue = fmt.Sprintf("%v", numericValue)
 		} else {
-			value = fmt.Sprintf("'%s'", value)
+			textValue = fmt.Sprintf("'%s'", tag.Value)
 		}
 
-		res = append(res, fmt.Sprintf(`%s"%s" %s %s`, str, tag.Key, tag.Operator, value))
+		res = append(res, fmt.Sprintf(`%s"%s" %s %s`, str, tag.Key, tag.Operator, textValue))
 	}
 
 	return res

pkg/tsdb/influxdb/query_builder_test.go

@@ -86,16 +86,34 @@ func TestInfluxdbQueryBuilder(t *testing.T) {
 			So(rawQuery, ShouldEqual, `Raw query`)
 		})
 
+		Convey("can render normal tags without operator", func() {
+			query := &Query{Tags: []*Tag{&Tag{Operator: "", Value: `value`, Key: "key"}}}
+
+			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" = 'value'`)
+		})
+
+		Convey("can render regex tags without operator", func() {
+			query := &Query{Tags: []*Tag{&Tag{Operator: "", Value: `/value/`, Key: "key"}}}
+
+			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" =~ /value/`)
+		})
+
 		Convey("can render regex tags", func() {
-			query := &Query{Tags: []*Tag{&Tag{Operator: "=~", Value: "value", Key: "key"}}}
+			query := &Query{Tags: []*Tag{&Tag{Operator: "=~", Value: `/value/`, Key: "key"}}}
 
-			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" =~ value`)
+			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" =~ /value/`)
 		})
 
 		Convey("can render number tags", func() {
-			query := &Query{Tags: []*Tag{&Tag{Operator: "=", Value: "1", Key: "key"}}}
+			query := &Query{Tags: []*Tag{&Tag{Operator: "=", Value: "10001", Key: "key"}}}
+
+			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" = 10001`)
+		})
+
+		Convey("can render number tags with decimals", func() {
+			query := &Query{Tags: []*Tag{&Tag{Operator: "=", Value: "10001.1", Key: "key"}}}
 
-			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" = 1`)
+			So(strings.Join(builder.renderTags(query), ""), ShouldEqual, `"key" = 10001.1`)
 		})
 
 		Convey("can render string tags", func() {