91b2164a4f
Adding go code to templater to support generation of strings based on the regular expression passed. Closes: #438 Change-Id: Ife0c4f8d5dd8032408875c73ba098919470be9e9
104 lines
2.5 KiB
Go
104 lines
2.5 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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"fmt"
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"text/template"
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sprig "github.com/Masterminds/sprig/v3"
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"github.com/lucasjones/reggen"
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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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)
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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 (t *plugin) Filter(items []*yaml.RNode) ([]*yaml.RNode, error) {
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out := &bytes.Buffer{}
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funcMap := sprig.TxtFuncMap()
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funcMap["toUint32"] = func(i int) uint32 { return uint32(i) }
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funcMap["toYaml"] = toYaml
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funcMap["regexGen"] = regexGen
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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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if err = tmpl.Execute(out, t.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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// Generate Regex
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func regexGen(regex string, limit int) string {
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if limit <= 0 {
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panic("Limit cannot be less than or equal to 0")
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}
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str, err := reggen.Generate(regex, limit)
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if err != nil {
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panic(err)
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}
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return str
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}
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// Render input yaml as output yaml
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// This function is from the Helm project:
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// https://github.com/helm/helm
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// Copyright The Helm Authors
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func toYaml(v interface{}) string {
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data, err := yaml.Marshal(v)
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if err != nil {
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// Swallow errors inside of a template.
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return ""
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}
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return string(data)
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}
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