79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package fs
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
// WriteFile overwrites a file with the specified bytes as content.
|
|
// If the path does not exist or the file cannot be written, an error is returned.
|
|
func WriteFile(fileName string, data []byte) error {
|
|
file, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, ModeFile)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = file.Write(data)
|
|
|
|
if closeErr := file.Close(); closeErr != nil && err == nil {
|
|
err = closeErr
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// WriteString overwrites a file with the specified string as content.
|
|
// If the path does not exist or the file cannot be written, an error is returned.
|
|
func WriteString(fileName string, s string) error {
|
|
return WriteFile(fileName, []byte(s))
|
|
}
|
|
|
|
// WriteUnixTime overwrites a file with the current Unix timestamp as content.
|
|
// If the path does not exist or the file cannot be written, an error is returned.
|
|
func WriteUnixTime(fileName string) (unixTime int64, err error) {
|
|
unixTime = time.Now().Unix()
|
|
return unixTime, WriteString(fileName, strconv.FormatInt(unixTime, 10))
|
|
}
|
|
|
|
// WriteFileFromReader writes data from an io.Reader to a newly created file with the specified name.
|
|
// If the path does not exist or the file cannot be written, an error is returned.
|
|
func WriteFileFromReader(fileName string, reader io.Reader) (err error) {
|
|
if fileName == "" {
|
|
return errors.New("filename missing")
|
|
} else if reader == nil {
|
|
return errors.New("reader missing")
|
|
}
|
|
|
|
var file *os.File
|
|
|
|
if file, err = os.OpenFile(fileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, ModeFile); err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = io.Copy(file, reader)
|
|
|
|
if closeErr := file.Close(); closeErr != nil && err == nil {
|
|
err = closeErr
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// CacheFileFromReader writes data from an io.Reader to a file with the specified name if it does not exist.
|
|
// If the path does not exist or the file cannot be written, an error is returned.
|
|
// No error is returned if the file already exists.
|
|
func CacheFileFromReader(fileName string, reader io.Reader) (string, error) {
|
|
if FileExistsNotEmpty(fileName) {
|
|
return fileName, nil
|
|
}
|
|
|
|
if err := WriteFileFromReader(fileName, reader); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return fileName, nil
|
|
}
|