config: use a validator for better configuration validation

common/helpers/validator_test.go

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2022 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package helpers_test
+
+import (
+	"testing"
+
+	"akvorado/common/helpers"
+)
+
+func TestListenValidator(t *testing.T) {
+	s := struct {
+		Listen string `validate:"listen"`
+	}{}
+	cases := []struct {
+		Listen string
+		Err    bool
+	}{
+		{"127.0.0.1:161", false},
+		{"localhost:161", false},
+		{"0.0.0.0:161", false},
+		{"0.0.0.0:0", false},
+		{"127.0.0.1:0", false},
+		{"localhost", true},
+		{"127.0.0.1", true},
+		{"127.0.0.1:what", true},
+		{"127.0.0.1:100000", true},
+	}
+	for _, tc := range cases {
+		s.Listen = tc.Listen
+		err := helpers.Validate.Struct(s)
+		if err == nil && tc.Err {
+			t.Error("Validate.Struct() expected an error")
+		} else if err != nil && !tc.Err {
+			t.Errorf("Validate.Struct() error:\n%+v", err)
+		}
+	}
+}