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logger.go
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logger.go
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package logger
import (
"bytes"
"fmt"
"io"
"os"
"github.com/kezhuw/leveldb/internal/file"
)
type Logger interface {
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
Warnf(format string, args ...interface{})
Errorf(format string, args ...interface{})
}
type LogCloser interface {
Logger
io.Closer
}
var Discard LogCloser = nopLogger{}
type nopLogger struct{}
func (nopLogger) Debugf(format string, args ...interface{}) {}
func (nopLogger) Infof(format string, args ...interface{}) {}
func (nopLogger) Warnf(format string, args ...interface{}) {}
func (nopLogger) Errorf(format string, args ...interface{}) {}
func (nopLogger) Close() error { return nil }
type nopCloser struct {
Logger
}
func (nopCloser) Close() error { return nil }
func NopCloser(l Logger) LogCloser {
return nopCloser{l}
}
func StdLogger(f *os.File) LogCloser {
return nopCloser{FileLogger(f)}
}
type fileLogger struct {
file file.WriteCloser
}
func (f *fileLogger) printf(severity, format string, args ...interface{}) {
var buf bytes.Buffer
buf.WriteString(severity)
buf.WriteByte(' ')
fmt.Fprintf(&buf, format, args...)
if b := buf.Bytes(); b[len(b)-1] != '\n' {
buf.WriteByte('\n')
}
f.file.Write(buf.Bytes())
}
func (f *fileLogger) Debugf(format string, args ...interface{}) {
f.printf("DEBUG", format, args...)
}
func (f *fileLogger) Warnf(format string, args ...interface{}) {
f.printf("WARN", format, args...)
}
func (f *fileLogger) Infof(format string, args ...interface{}) {
f.printf("INFO", format, args...)
}
func (f *fileLogger) Errorf(format string, args ...interface{}) {
f.printf("ERROR", format, args...)
}
func (f *fileLogger) Close() error {
return f.file.Close()
}
func FileLogger(f file.WriteCloser) LogCloser {
return &fileLogger{f}
}