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package log
import (
"fmt"
"io"
)
type Logger interface {
Log(format string, a ...interface{})
}
var (
_ Logger = &logger{}
_ Logger = &nopLogger{}
)
type logger struct {
w io.Writer
}
func NewLogger(w io.Writer) (*logger, error) {
if w == nil {
return nil, fmt.Errorf("w is nil; NewLogger() needs a writer")
}
return &logger{
w: w,
}, nil
}
func (l *logger) Log(format string, a ...interface{}) {
fmt.Fprintf(l.w, format+"\n", a...)
}
type nopLogger struct {
}
func NewNopLogger() *nopLogger {
return &nopLogger{}
}
func (l *nopLogger) Log(format string, a ...interface{}) {
}
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