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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
package thrift
import (
// Logger is a simple wrapper of a logging function.
// In reality the users might actually use different logging libraries, and they
// are not always compatible with each other.
// Logger is meant to be a simple common ground that it's easy to wrap whatever
// logging library they use into.
// See for the design
// discussion behind it.
type Logger func(msg string)
// NopLogger is a Logger implementation that does nothing.
func NopLogger(msg string) {}
// StdLogger wraps stdlib log package into a Logger.
// If logger passed in is nil, it will fallback to use stderr and default flags.
func StdLogger(logger *log.Logger) Logger {
if logger == nil {
logger = log.New(os.Stderr, "", log.LstdFlags)
return func(msg string) {
func fallbackLogger(logger Logger) Logger {
if logger == nil {
return StdLogger(nil)
return logger