text: /*
   *
   * Copyright 2020 gRPC authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  package grpclog
  
  // PrefixLogger does logging with a prefix.
  //
  // Logging method on a nil logs without any prefix.
  type PrefixLogger struct {
  	prefix string
  }
  
  // Infof does info logging.
  func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
  	if pl != nil {
  		// Handle nil, so the tests can pass in a nil logger.
  		format = pl.prefix + format
  	}
  	Logger.Infof(format, args...)
  }
  
  // Warningf does warning logging.
  func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
  	if pl != nil {
  		format = pl.prefix + format
  	}
  	Logger.Warningf(format, args...)
  }
  
  // Errorf does error logging.
  func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
  	if pl != nil {
  		format = pl.prefix + format
  	}
  	Logger.Errorf(format, args...)
  }
  
  // Debugf does info logging at verbose level 2.
  func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
  	if Logger.V(2) {
  		pl.Infof(format, args...)
  	}
  }
  
  // NewPrefixLogger creates a prefix logger with the given prefix.
  func NewPrefixLogger(prefix string) *PrefixLogger {
  	return &PrefixLogger{prefix: prefix}
  }
  