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renderTemplate.go
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renderTemplate.go
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package generate
import (
"bytes"
"fmt"
"os"
gotemplate "text/template"
"github.com/SAP/configuration-tools-for-gitops/pkg/files"
"github.com/SAP/configuration-tools-for-gitops/pkg/yamlfile"
)
var (
filesWrite = files.Write
)
func ParseTemplate(filename string, valueFiles []string, target string) error {
p := parser{}
if err := p.parse(filename); err != nil {
return fmt.Errorf("failed to parse file %q: %w", filename, err)
}
combinedValues, err := mergeValues(valueFiles)
if err != nil {
return err
}
var templateInputs interface{}
if e := combinedValues.Decode(&templateInputs); e != nil {
return fmt.Errorf("failed to decode values: %w", e)
}
output, err := p.execute(templateInputs)
if err != nil {
return fmt.Errorf("failed to render template %q: %w", filename, err)
}
if err := filesWrite(target, files.AllReadWrite, output); err != nil {
return fmt.Errorf("failed to write to file %q: %w", target, err)
}
return nil
}
type parserInt interface {
parse(filename string) error
execute(data interface{}) ([]byte, error)
}
type parserMock struct {
Mock bool
Err error
}
func (m parserMock) parse(filename string) error {
return nil
}
func (m parserMock) execute(data interface{}) ([]byte, error) {
return nil, m.Err
}
type parser struct {
tmpl *gotemplate.Template
}
func (p *parser) parse(filename string) error {
b, err := os.ReadFile(filename)
if err != nil {
return err
}
parsed, err := gotemplate.New(filename).Funcs(tmplFuncs()).Parse(string(b))
if err != nil {
return err
}
p.tmpl = parsed
return nil
}
func (p parser) execute(data interface{}) ([]byte, error) {
generated := new(bytes.Buffer)
err := p.tmpl.Execute(generated, data)
if err != nil {
return nil, err
}
return generated.Bytes(), nil
}
func mergeValues(valueFiles []string) (res yamlfile.Yaml, err error) {
res, err = yamlfile.New([]byte{})
if err != nil {
err = fmt.Errorf("failed to create combined values file: %w", err)
return
}
for _, v := range valueFiles {
content, e := files.Read(v)
if e != nil {
err = fmt.Errorf("failed to read file %q: %w", v, e)
return
}
if _, e := res.MergeBytes(content); e != nil {
err = fmt.Errorf("failed to combine values file %q: %w", v, err)
return
}
}
return
}