go.etcd.io/etcd@v3.3.27+incompatible/pkg/logutil/discard_logger.go (about)

     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  
    15  package logutil
    16  
    17  import (
    18  	"log"
    19  
    20  	"google.golang.org/grpc/grpclog"
    21  )
    22  
    23  // assert that "discardLogger" satisfy "Logger" interface
    24  var _ Logger = &discardLogger{}
    25  
    26  // NewDiscardLogger returns a new Logger that discards everything except "fatal".
    27  func NewDiscardLogger() Logger { return &discardLogger{} }
    28  
    29  type discardLogger struct{}
    30  
    31  func (l *discardLogger) Info(args ...interface{})                    {}
    32  func (l *discardLogger) Infoln(args ...interface{})                  {}
    33  func (l *discardLogger) Infof(format string, args ...interface{})    {}
    34  func (l *discardLogger) Warning(args ...interface{})                 {}
    35  func (l *discardLogger) Warningln(args ...interface{})               {}
    36  func (l *discardLogger) Warningf(format string, args ...interface{}) {}
    37  func (l *discardLogger) Error(args ...interface{})                   {}
    38  func (l *discardLogger) Errorln(args ...interface{})                 {}
    39  func (l *discardLogger) Errorf(format string, args ...interface{})   {}
    40  func (l *discardLogger) Fatal(args ...interface{})                   { log.Fatal(args...) }
    41  func (l *discardLogger) Fatalln(args ...interface{})                 { log.Fatalln(args...) }
    42  func (l *discardLogger) Fatalf(format string, args ...interface{})   { log.Fatalf(format, args...) }
    43  func (l *discardLogger) V(lvl int) bool {
    44  	return false
    45  }
    46  func (l *discardLogger) Lvl(lvl int) grpclog.LoggerV2 { return l }