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package files
import (
"compress/gzip"
"context"
"io"
"io/fs"
"os"
"path/filepath"
"go.alanpearce.eu/x/log"
"github.com/a-h/templ"
"github.com/andybalholm/brotli"
"gitlab.com/tozd/go/errors"
)
const (
gzipLevel = 6
brotliLevel = 9
)
type Files struct {
outputDirectory string
options *Options
log *log.Logger
}
type Options struct {
Compress bool
}
func NewWriter(outputDirectory string, logger *log.Logger, opts *Options) *Files {
return &Files{
outputDirectory: outputDirectory,
options: opts,
log: logger,
}
}
func (f *Files) CopyRecursive(src string) error {
return filepath.WalkDir(src, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
rel, err := filepath.Rel(src, path)
if err != nil {
return err
}
if d.IsDir() {
return f.mkdirp(rel)
}
sf, err := os.Open(path)
if err != nil {
return err
}
defer sf.Close()
df, err := f.openFileAndVariants(filepath.Join(f.outputDirectory, rel))
if err != nil {
return err
}
defer df.Close()
if _, err := io.Copy(df, sf); err != nil {
return err
}
return nil
})
}
func (f *Files) Open(filename string) (io.ReadCloser, error) {
return os.Open(filepath.Join(f.outputDirectory, filename))
}
func (f *Files) OutputToFile(output io.Reader, filename string) error {
fn := filepath.Join(f.outputDirectory, filename)
if err := f.mkdirp(filepath.Dir(filename)); err != nil {
return err
}
f.log.Debug("outputting file", "filename", fn)
file, err := f.openFileAndVariants(fn)
if err != nil {
return errors.WithMessage(err, "could not open output file")
}
defer file.Close()
if _, err := io.Copy(file, output); err != nil {
return errors.WithMessage(err, "could not write output file")
}
return nil
}
func (f *Files) RenderToFile(component templ.Component, filename string) error {
fn := filepath.Join(f.outputDirectory, filename)
if err := f.mkdirp(filepath.Dir(filename)); err != nil {
return err
}
f.log.Debug("outputting file", "filename", filename)
file, err := f.openFileAndVariants(fn)
if err != nil {
return errors.WithMessage(err, "could not open output file")
}
defer file.Close()
if err := component.Render(context.TODO(), file); err != nil {
return errors.WithMessage(err, "could not write output file")
}
return nil
}
func (f *Files) WriterToFile(writer io.WriterTo, filename string) error {
fn := filepath.Join(f.outputDirectory, filename)
if err := f.mkdirp(filepath.Dir(filename)); err != nil {
return err
}
f.log.Debug("outputting file", "filename", fn)
file, err := f.openFileAndVariants(fn)
if err != nil {
return errors.WithMessage(err, "could not open output file")
}
defer file.Close()
if _, err := writer.WriteTo(file); err != nil {
return errors.WithMessage(err, "could not write output file")
}
return nil
}
type MultiWriteCloser struct {
writers []io.WriteCloser
multiWriter io.Writer
}
func (mw *MultiWriteCloser) Write(p []byte) (n int, err error) {
return mw.multiWriter.Write(p)
}
func (mw *MultiWriteCloser) Close() error {
var lastErr error
for _, w := range mw.writers {
err := w.Close()
if err != nil {
lastErr = err
}
}
return lastErr
}
func openFileWrite(filename string) (*os.File, error) {
return os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
}
func openFileGz(filename string) (*gzip.Writer, error) {
filenameGz := filename + ".gz"
f, err := openFileWrite(filenameGz)
if err != nil {
return nil, err
}
return gzip.NewWriterLevel(f, gzipLevel)
}
func openFileBrotli(filename string) (*brotli.Writer, error) {
filenameBrotli := filename + ".br"
f, err := openFileWrite(filenameBrotli)
if err != nil {
return nil, err
}
return brotli.NewWriterLevel(f, brotliLevel), nil
}
func multiOpenFile(filename string) (*MultiWriteCloser, error) {
r, err := openFileWrite(filename)
if err != nil {
return nil, err
}
gz, err := openFileGz(filename)
if err != nil {
return nil, err
}
br, err := openFileBrotli(filename)
if err != nil {
return nil, err
}
return &MultiWriteCloser{
writers: []io.WriteCloser{r, gz, br},
multiWriter: io.MultiWriter(r, gz, br),
}, nil
}
func (f *Files) openFileAndVariants(filename string) (io.WriteCloser, error) {
if f.options.Compress {
return multiOpenFile(filename)
}
return openFileWrite(filename)
}
func (f *Files) mkdirp(dir string) error {
f.log.Debug("creating directory", "dir", dir)
err := os.MkdirAll(filepath.Join(f.outputDirectory, dir), 0755)
return errors.WithMessage(err, "could not create directory")
}
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