mirror of
https://github.com/k3s-io/k3s.git
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72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package crictl
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import (
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"bytes"
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"encoding/json"
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"strings"
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"text/template"
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"github.com/pkg/errors"
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)
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func builtinTmplFuncs() template.FuncMap {
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return template.FuncMap{
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"json": jsonBuiltinTmplFunc,
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"title": strings.Title,
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"lower": strings.ToLower,
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"upper": strings.ToUpper,
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}
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}
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// jsonBuiltinTmplFunc allows to jsonify result of template execution.
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func jsonBuiltinTmplFunc(v interface{}) string {
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o := new(bytes.Buffer)
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enc := json.NewEncoder(o)
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// FIXME(fuweid): should we panic?
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enc.Encode(v)
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return o.String()
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}
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// tmplExecuteRawJSON executes the template with interface{} with decoded by
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// rawJSON string.
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func tmplExecuteRawJSON(tmplStr string, rawJSON string) (string, error) {
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dec := json.NewDecoder(
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bytes.NewReader([]byte(rawJSON)),
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)
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dec.UseNumber()
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var raw interface{}
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if err := dec.Decode(&raw); err != nil {
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return "", errors.Wrapf(err, "failed to decode json")
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}
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var o = new(bytes.Buffer)
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tmpl, err := template.New("tmplExecuteRawJSON").Funcs(builtinTmplFuncs()).Parse(tmplStr)
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if err != nil {
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return "", errors.Wrapf(err, "failed to generate go-template")
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}
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// return error if key doesn't exist
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tmpl = tmpl.Option("missingkey=error")
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if err := tmpl.Execute(o, raw); err != nil {
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return "", errors.Wrapf(err, "failed to template data")
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}
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return o.String(), nil
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}
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