Fronius Gen24: fix integer deprecated (#4602)

templates/definition/meter/fronius-gen24.yaml

@@ -14,6 +14,8 @@ params:
   - name: host
   - name: port
     default: 502
+  - name: integer
+    deprecated: true
 render: |
   # reference: https://github.com/volkszaehler/mbmd/blob/master/meters/sunspec/models.go
   {{- if eq .usage "grid" }}

util/templates/init.go

@@ -1,6 +1,7 @@
 package templates
 
 import (
+	"bytes"
 	"fmt"
 	"io/fs"
 	"path"
@@ -28,8 +29,12 @@ func init() {
 }
 
 func FromBytes(b []byte) (Template, error) {
+	// panic if template definition contains unknown fields
+	dec := yaml.NewDecoder(bytes.NewReader(b))
+	dec.KnownFields(true)
+
 	var definition TemplateDefinition
-	if err := yaml.Unmarshal(b, &definition); err != nil {
+	if err := dec.Decode(&definition); err != nil {
 		return Template{}, err
 	}
 

util/templates/render.go

@@ -1,6 +1,7 @@
 package templates
 
 import (
+	"errors"
 	"os"
 	"testing"
 
@@ -37,7 +38,9 @@ func RenderInstance(class Class, other map[string]interface{}) (Instance, error)
 	}
 
 	var instance Instance
-	err = yaml.Unmarshal(b, &instance)
+	if err = yaml.Unmarshal(b, &instance); err == nil && instance.Type == "" {
+		err = errors.New("empty instance type- check for missing usage")
+	}
 
 	return instance, err
 }

util/templates/template.go

@@ -317,9 +317,11 @@ func (t *Template) RenderResult(renderMode string, other map[string]interface{})
 		out := strings.ToLower(key)
 
 		if i, p := t.ParamByName(key); i == -1 {
-			if !slices.Contains(predefinedTemplateProperties, strings.ToLower(key)) {
+			if !slices.Contains(predefinedTemplateProperties, out) {
 				return nil, values, fmt.Errorf("invalid key: %s", key)
 			}
+		} else if p.Deprecated {
+			continue
 		} else {
 			out = p.Name
 		}