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log.go
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log.go
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// Copyright 2020 Envoyproxy 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 log provides a logging interface for use in this library.
package log
// Logger interface for reporting informational and warning messages.
type Logger interface {
// Debugf logs a formatted debugging message.
Debugf(format string, args ...interface{})
// Infof logs a formatted informational message.
Infof(format string, args ...interface{})
// Warnf logs a formatted warning message.
Warnf(format string, args ...interface{})
// Errorf logs a formatted error message.
Errorf(format string, args ...interface{})
}
// LoggerFuncs implements the Logger interface, allowing the
// caller to specify only the logging functions that are desired.
type LoggerFuncs struct {
DebugFunc func(string, ...interface{})
InfoFunc func(string, ...interface{})
WarnFunc func(string, ...interface{})
ErrorFunc func(string, ...interface{})
}
// Debugf logs a formatted debugging message.
func (f LoggerFuncs) Debugf(format string, args ...interface{}) {
if f.DebugFunc != nil {
f.DebugFunc(format, args...)
}
}
// Infof logs a formatted informational message.
func (f LoggerFuncs) Infof(format string, args ...interface{}) {
if f.InfoFunc != nil {
f.InfoFunc(format, args...)
}
}
// Warnf logs a formatted warning message.
func (f LoggerFuncs) Warnf(format string, args ...interface{}) {
if f.WarnFunc != nil {
f.WarnFunc(format, args...)
}
}
// Errorf logs a formatted error message.
func (f LoggerFuncs) Errorf(format string, args ...interface{}) {
if f.ErrorFunc != nil {
f.ErrorFunc(format, args...)
}
}