github.com/telepresenceio/telepresence/v2@v2.20.0-pro.6.0.20240517030216-236ea954e789/integration_test/itest/template.go (about)

     1  package itest
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"io"
     7  	"path/filepath"
     8  	"strings"
     9  	"text/template"
    10  
    11  	"github.com/Masterminds/sprig/v3"
    12  	"sigs.k8s.io/yaml"
    13  )
    14  
    15  func OpenTemplate(ctx context.Context, name string, data any) (io.Reader, error) {
    16  	b, err := ReadTemplate(ctx, name, data)
    17  	if err != nil {
    18  		return nil, err
    19  	}
    20  	return bytes.NewReader(b), nil
    21  }
    22  
    23  func ReadTemplate(ctx context.Context, name string, data any) ([]byte, error) {
    24  	fnMap := sprig.FuncMap()
    25  	fnMap["toYaml"] = toYAML
    26  	tpl, err := template.New("").Funcs(fnMap).ParseFiles(filepath.Join(GetWorkingDir(ctx), name))
    27  	if err != nil {
    28  		return nil, err
    29  	}
    30  	wr := bytes.Buffer{}
    31  	if err = tpl.ExecuteTemplate(&wr, filepath.Base(name), data); err != nil {
    32  		return nil, err
    33  	}
    34  	return wr.Bytes(), nil
    35  }
    36  
    37  // toYAML is direct copy of toYaml in the helm.sh/helm/v3/pkg/engine package.
    38  func toYAML(v interface{}) string {
    39  	data, err := yaml.Marshal(v)
    40  	if err != nil {
    41  		// Swallow errors inside of a template.
    42  		return ""
    43  	}
    44  	return strings.TrimSuffix(string(data), "\n")
    45  }