console/filter: accept empty filters

console/query.go

@@ -3,6 +3,7 @@ package console
 import (
 	"errors"
 	"fmt"
+	"strings"
 
 	"akvorado/common/helpers"
 	"akvorado/console/filter"
@@ -98,6 +99,10 @@ func (gf queryFilter) MarshalText() ([]byte, error) {
 	return []byte(gf.filter), nil
 }
 func (gf *queryFilter) UnmarshalText(input []byte) error {
+	if strings.TrimSpace(string(input)) == "" {
+		*gf = queryFilter{""}
+		return nil
+	}
 	got, err := filter.Parse("", input)
 	if err != nil {
 		return fmt.Errorf("cannot parse filter: %s", filter.HumanError(err))

console/query_test.go

@@ -43,3 +43,26 @@ func TestQueryColumnSQLSelect(t *testing.T) {
 		})
 	}
 }
+
+func TestUnmarshalFilter(t *testing.T) {
+	cases := []struct {
+		Input    string
+		Expected string
+	}{
+		{"", ""},
+		{"   ", ""},
+		{"SrcPort=12322", "SrcPort = 12322"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.Input, func(t *testing.T) {
+			var qf queryFilter
+			err := qf.UnmarshalText([]byte(tc.Input))
+			if err != nil {
+				t.Fatalf("UnmarshalText(%q) error:\n%+v", tc.Input, err)
+			}
+			if diff := helpers.Diff(qf.filter, tc.Expected); diff != "" {
+				t.Fatalf("UnmarshalText(%q) (-got, +want):\n%s", tc.Input, diff)
+			}
+		})
+	}
+}