mirror of https://github.com/k3s-io/k3s
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
/*
|
|
Copyright 2020 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 crictl
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"strings"
|
|
"text/template"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
func builtinTmplFuncs() template.FuncMap {
|
|
return template.FuncMap{
|
|
"json": jsonBuiltinTmplFunc,
|
|
"title": strings.Title,
|
|
"lower": strings.ToLower,
|
|
"upper": strings.ToUpper,
|
|
}
|
|
}
|
|
|
|
// jsonBuiltinTmplFunc allows to jsonify result of template execution.
|
|
func jsonBuiltinTmplFunc(v interface{}) string {
|
|
o := new(bytes.Buffer)
|
|
enc := json.NewEncoder(o)
|
|
// FIXME(fuweid): should we panic?
|
|
enc.Encode(v)
|
|
return o.String()
|
|
}
|
|
|
|
// tmplExecuteRawJSON executes the template with interface{} with decoded by
|
|
// rawJSON string.
|
|
func tmplExecuteRawJSON(tmplStr string, rawJSON string) (string, error) {
|
|
dec := json.NewDecoder(
|
|
bytes.NewReader([]byte(rawJSON)),
|
|
)
|
|
dec.UseNumber()
|
|
|
|
var raw interface{}
|
|
if err := dec.Decode(&raw); err != nil {
|
|
return "", errors.Wrapf(err, "failed to decode json")
|
|
}
|
|
|
|
var o = new(bytes.Buffer)
|
|
tmpl, err := template.New("tmplExecuteRawJSON").Funcs(builtinTmplFuncs()).Parse(tmplStr)
|
|
if err != nil {
|
|
return "", errors.Wrapf(err, "failed to generate go-template")
|
|
}
|
|
|
|
// return error if key doesn't exist
|
|
tmpl = tmpl.Option("missingkey=error")
|
|
if err := tmpl.Execute(o, raw); err != nil {
|
|
return "", errors.Wrapf(err, "failed to template data")
|
|
}
|
|
return o.String(), nil
|
|
}
|