mirror of https://github.com/kubernetes/kops.git
70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
/*
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Copyright 2019 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 resources
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import (
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"bytes"
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"fmt"
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"io"
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"text/template"
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"k8s.io/kops/upup/pkg/fi"
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)
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type templateResource struct {
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key string
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definition string
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context interface{}
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parsed *template.Template
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}
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var _ fi.Resource = &templateResource{}
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func newTemplateResource(key string, definition string, functions template.FuncMap, context interface{}) (*templateResource, error) {
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r := &templateResource{
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key: key,
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definition: definition,
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context: context,
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}
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t := template.New(key)
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t.Funcs(functions)
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_, err := t.Parse(definition)
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if err != nil {
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return nil, fmt.Errorf("error parsing template %q: %v", key, err)
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}
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t.Option("missingkey=zero")
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r.parsed = t
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return r, nil
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}
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func (r *templateResource) Open() (io.Reader, error) {
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buffer := &bytes.Buffer{}
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err := r.parsed.ExecuteTemplate(buffer, r.key, r.context)
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if err != nil {
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return nil, fmt.Errorf("error executing template %q: %v", r.key, err)
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}
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return buffer, nil
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}
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