/
logger.go
59 lines (52 loc) · 938 Bytes
/
logger.go
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package app
import (
"io"
"io/ioutil"
"log"
"os"
)
// Logger is a logger that has *os.File.
type Logger struct {
*log.Logger
file *os.File
}
func NewLogger(logfile string) (*Logger, error) {
var file *os.File
var w io.Writer
if logfile == "" {
w = os.Stderr
} else if logfile == "-" {
w = os.Stdout
} else {
path, err := absPath(logfile)
if err != nil {
return nil, err
}
file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0600)
if err != nil {
return nil, err
}
w = file
}
logger := &Logger{
Logger: log.New(w, "", log.LstdFlags),
file: file,
}
return logger, nil
}
func NewNullLogger() (*Logger, error) {
return &Logger{
Logger: log.New(ioutil.Discard, "", 0),
}, nil
}
// Close close the log file when it is not nil.
func (l *Logger) Close() error {
if l.file != nil {
err := l.file.Close()
if err != nil {
return err
}
l.file = nil
}
return nil
}