mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-10 02:37:11 +00:00
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
|
/*
|
||
|
|
Copyright 2025 The Kubernetes Authors.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package template
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
"text/template"
|
||
|
|
|
||
|
|
"github.com/Masterminds/sprig/v3"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Helper struct {
|
||
|
|
template *template.Template
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewHelper(name string) (*Helper, error) {
|
||
|
|
tmpl := template.New("").Funcs(sprig.FuncMap()).Option("missingkey=error")
|
||
|
|
tmpl, err := tmpl.Parse(name)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("invalid template: %w", err)
|
||
|
|
}
|
||
|
|
return &Helper{template: tmpl}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *Helper) execute(data interface{}) (string, error) {
|
||
|
|
var tmp bytes.Buffer
|
||
|
|
if err := h.template.Execute(&tmp, data); err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
return tmp.String(), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ExpandMap is a helper for expanding a template in to a map of strings. Data
|
||
|
|
// after executing the template is expected to be key=value pairs separated by
|
||
|
|
// newlines.
|
||
|
|
func (h *Helper) ExpandMap(data interface{}) (map[string]string, error) {
|
||
|
|
expanded, err := h.execute(data)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Split out individual key-value pairs
|
||
|
|
out := make(map[string]string)
|
||
|
|
for _, item := range strings.Split(expanded, "\n") {
|
||
|
|
// Remove leading/trailing whitespace and skip empty lines
|
||
|
|
if trimmed := strings.TrimSpace(item); trimmed != "" {
|
||
|
|
split := strings.SplitN(trimmed, "=", 2)
|
||
|
|
if len(split) == 1 {
|
||
|
|
return nil, fmt.Errorf("missing value in expanded template line %q, (format must be '<key>=<value>')", trimmed)
|
||
|
|
}
|
||
|
|
out[split[0]] = split[1]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return out, nil
|
||
|
|
}
|