forked from roboll/helmfile
/
file_renderer.go
78 lines (68 loc) · 1.78 KB
/
file_renderer.go
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package tmpl
import (
"bytes"
"io/ioutil"
"fmt"
"strings"
)
type FileRenderer struct {
ReadFile func(string) ([]byte, error)
Context *Context
Data interface{}
}
func NewFileRenderer(readFile func(filename string) ([]byte, error), basePath string, data interface{}) *FileRenderer {
return &FileRenderer{
ReadFile: readFile,
Context: &Context{
basePath: basePath,
readFile: readFile,
},
Data: data,
}
}
func NewFirstPassRenderer(basePath string, data interface{}) *FileRenderer {
return &FileRenderer{
ReadFile: ioutil.ReadFile,
Context: &Context{
preRender: true,
basePath: basePath,
readFile: ioutil.ReadFile,
},
Data: data,
}
}
func (r *FileRenderer) RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error) {
content, err := r.ReadFile(file)
if err != nil {
return nil, err
}
return r.RenderTemplateContentToBuffer(content)
}
func (r *FileRenderer) RenderToBytes(path string) ([]byte, error) {
var yamlBytes []byte
splits := strings.Split(path, ".")
if len(splits) > 0 && splits[len(splits)-1] == "gotmpl" {
yamlBuf, err := r.RenderTemplateFileToBuffer(path)
if err != nil {
return nil, fmt.Errorf("failed to render [%s], because of %v", path, err)
}
yamlBytes = yamlBuf.Bytes()
} else {
var err error
yamlBytes, err = r.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to load [%s]: %v", path, err)
}
}
return yamlBytes, nil
}
func (r *FileRenderer) RenderTemplateContentToBuffer(content []byte) (*bytes.Buffer, error) {
return r.Context.RenderTemplateToBuffer(string(content), r.Data)
}
func (r *FileRenderer) RenderTemplateContentToString(content []byte) (string, error) {
buf, err := r.Context.RenderTemplateToBuffer(string(content), r.Data)
if err != nil {
return "", err
}
return buf.String(), nil
}