102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
/*
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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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https://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 templater
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"text/template"
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"k8s.io/apimachinery/pkg/runtime"
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"sigs.k8s.io/kustomize/kyaml/kio"
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"sigs.k8s.io/kustomize/kyaml/yaml"
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airshipv1 "opendev.org/airship/airshipctl/pkg/api/v1alpha1"
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sprig "github.com/Masterminds/sprig/v3"
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extlib "opendev.org/airship/airshipctl/pkg/document/plugin/templater/extlib"
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)
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var _ kio.Filter = &plugin{}
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type plugin struct {
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*airshipv1.Templater
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}
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// New creates new instance of the plugin
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func New(obj map[string]interface{}) (kio.Filter, error) {
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cfg := &airshipv1.Templater{}
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err := runtime.DefaultUnstructuredConverter.FromUnstructured(obj, cfg)
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if err != nil {
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return nil, err
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}
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return &plugin{
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Templater: cfg,
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}, nil
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}
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func funcMapAppend(fma, fmb template.FuncMap) template.FuncMap {
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for k, v := range fmb {
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_, ok := fma[k]
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if ok {
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panic(fmt.Errorf("trying to redefine function %s that already exists", k))
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}
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fma[k] = v
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}
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return fma
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}
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func (t *plugin) Filter(items []*yaml.RNode) ([]*yaml.RNode, error) {
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out := &bytes.Buffer{}
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funcMap := template.FuncMap{}
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funcMap = funcMapAppend(funcMap, sprig.TxtFuncMap())
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funcMap = funcMapAppend(funcMap, extlib.GenericFuncMap())
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tmpl, err := template.New("tmpl").Funcs(funcMap).Parse(t.Template)
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if err != nil {
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return nil, err
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}
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var values interface{}
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if t.Values != nil {
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if err = json.Unmarshal(t.Values.Raw, &values); err != nil {
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return nil, err
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}
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}
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if err = tmpl.Execute(out, values); err != nil {
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return nil, err
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}
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p := kio.Pipeline{
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Inputs: []kio.Reader{&kio.ByteReader{Reader: out}},
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Outputs: []kio.Writer{&kio.PackageBuffer{}},
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}
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err = p.Execute()
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if err != nil {
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return nil, err
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}
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res, ok := p.Outputs[0].(*kio.PackageBuffer)
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if !ok {
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return nil, fmt.Errorf("output conversion error")
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}
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return append(items, res.Nodes...), nil
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}
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