1// Copyright 2018 The etcd Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package logutil 16 17import ( 18 "log" 19 20 "google.golang.org/grpc/grpclog" 21) 22 23// assert that "discardLogger" satisfy "Logger" interface 24var _ Logger = &discardLogger{} 25 26// NewDiscardLogger returns a new Logger that discards everything except "fatal". 27func NewDiscardLogger() Logger { return &discardLogger{} } 28 29type discardLogger struct{} 30 31func (l *discardLogger) Info(args ...interface{}) {} 32func (l *discardLogger) Infoln(args ...interface{}) {} 33func (l *discardLogger) Infof(format string, args ...interface{}) {} 34func (l *discardLogger) Warning(args ...interface{}) {} 35func (l *discardLogger) Warningln(args ...interface{}) {} 36func (l *discardLogger) Warningf(format string, args ...interface{}) {} 37func (l *discardLogger) Error(args ...interface{}) {} 38func (l *discardLogger) Errorln(args ...interface{}) {} 39func (l *discardLogger) Errorf(format string, args ...interface{}) {} 40func (l *discardLogger) Fatal(args ...interface{}) { log.Fatal(args...) } 41func (l *discardLogger) Fatalln(args ...interface{}) { log.Fatalln(args...) } 42func (l *discardLogger) Fatalf(format string, args ...interface{}) { log.Fatalf(format, args...) } 43func (l *discardLogger) V(lvl int) bool { 44 return false 45} 46func (l *discardLogger) Lvl(lvl int) grpclog.LoggerV2 { return l } 47