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file.go
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file.go
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package task
import (
"fmt"
"io"
"io/fs"
"os"
"path"
"github.com/rs/zerolog/log"
)
type WriteFileToDiskTask struct {
// name filename
name string
// suffix file suffix
suffix string
folder string
// overwrite if exists
overwrite bool
data io.Reader
}
func NewWriteFileToDiskTask(name string, suffix string, folder string, overwrite bool, in io.Reader) *WriteFileToDiskTask {
return &WriteFileToDiskTask{
name: name,
suffix: suffix,
folder: folder,
overwrite: overwrite,
data: in,
}
}
func (wft *WriteFileToDiskTask) Run() error {
if wft.shouldSkip() {
log.Info().Str("file", wft.getFullPath()).Bool("overwrite", wft.overwrite).Msg("emit file [skipped]")
return nil
}
if err := wft.write(); err != nil {
return err
}
log.Info().Str("file", wft.getFullPath()).Msg("emit file")
return nil
}
func (wft *WriteFileToDiskTask) shouldSkip() bool {
return fileExists(wft.getFullPath()) && !wft.overwrite
}
func (wft *WriteFileToDiskTask) getFullPath() string {
return path.Join(wft.folder, wft.name+wft.suffix)
}
func (wft *WriteFileToDiskTask) write() error {
if err := wft.mkdirIfNecessary(); err != nil {
return err
}
filePath := wft.getFullPath()
fd, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE, fs.ModePerm)
if err != nil {
return fmt.Errorf("open file [path: %s]: %w", filePath, err)
}
defer fd.Close()
n, err := io.Copy(fd, wft.data)
if err != nil {
return fmt.Errorf("write data to %s: %w", filePath, err)
}
log.Debug().Str("file", filePath).Int64("bytes", n).Msg("write file")
return nil
}
func (wft *WriteFileToDiskTask) mkdirIfNecessary() error {
dir := wft.folder
if dir == "" {
return nil
}
if fileExists(dir) {
return nil
}
err := os.MkdirAll(dir, fs.ModePerm)
if err != nil {
return fmt.Errorf("make dir %s: %w", dir, err)
}
return nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}
type FileProvider interface {
Get() (io.Reader, error)
}
type ReadFromProviderTask struct {
provider FileProvider
out io.Writer
}
func NewReadFromProviderTask(provider FileProvider, out io.Writer) *ReadFromProviderTask {
return &ReadFromProviderTask{provider: provider, out: out}
}
func (t *ReadFromProviderTask) Run() error {
fd, err := t.provider.Get()
if err != nil {
return fmt.Errorf("get file from provider: %w", err)
}
if _, err := io.Copy(t.out, fd); err != nil {
return fmt.Errorf("copy file from provider: %w", err)
}
return nil
}