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logger.go
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logger.go
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// Copyright 2019 Erik Agsjö
//
// 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 logger
import (
"log"
"os"
"strings"
)
// LogWriter is the main logging interface
type LogWriter interface {
Printf(string, ...interface{})
}
type null struct{}
func (null) Printf(string, ...interface{}) {}
// Debug level log writer
var Debug LogWriter = null{}
// Info level log writer
var Info LogWriter = null{}
// Warning level log writer
var Warning LogWriter = null{}
// Error level log writer
var Error LogWriter = null{}
// LogLevel is the type of all log levels
type LogLevel int
// Debug levels
const (
DEBUG LogLevel = iota
INFO
WARNING
ERROR
)
var levels = map[string]LogLevel{
"DEBUG": DEBUG,
"INFO": INFO,
"WARNING": WARNING,
"ERROR": ERROR,
}
var currentLevel = INFO
// Level gets the current log level
func Level() LogLevel {
return currentLevel
}
func init() {
if level, set := os.LookupEnv("LOG_LEVEL"); set {
numLevel, found := levels[strings.ToUpper(level)]
if found {
currentLevel = numLevel
}
}
switch currentLevel {
case DEBUG:
Debug = log.New(os.Stderr, "[DEBUG] ", log.LstdFlags)
fallthrough
case INFO:
Info = log.New(os.Stderr, "[INFO] ", log.LstdFlags)
fallthrough
case WARNING:
Warning = log.New(os.Stderr, "[WARNING] ", log.LstdFlags)
fallthrough
case ERROR:
Error = log.New(os.Stderr, "[ERROR] ", log.LstdFlags)
}
}