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files.go
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/
files.go
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package files
import (
"fmt"
"os"
"path/filepath"
"github.com/fsnotify/fsnotify"
)
const (
CSVExtension = ".csv"
)
func ListenForType(dir string, fileExtension string) <-chan string {
filenameCh := make(chan string)
go func() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer watcher.Close()
done := make(chan bool)
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op == fsnotify.Create {
newFileExtension := filepath.Ext(event.Name)
if newFileExtension == CSVExtension {
filenameCh <- event.Name
}
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
fmt.Println(err)
}
}
}()
err = watcher.Add(dir)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
<-done
}()
return filenameCh
}
func Cleanup(filepath string, passes int) error {
for i := 0; i < passes; i++ {
f, err := os.OpenFile(filepath, os.O_WRONLY, 0)
if err != nil {
return err
}
defer f.Close()
info, err := f.Stat()
if err != nil {
return err
}
buff := make([]byte, info.Size())
_, err = f.WriteAt(buff, 0)
if err != nil {
return err
}
}
err := os.Remove(filepath)
if err != nil {
return err
}
return nil
}