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log.go
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log.go
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// Copyright 2014-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 (
"os"
"strings"
"sync"
log "github.com/cihub/seelog"
)
const (
LOGLEVEL_ENV_VAR = "ECS_LOGLEVEL"
LOGFILE_ENV_VAR = "ECS_LOGFILE"
DEFAULT_LOGLEVEL = "info"
)
var logfile string
var level string
var levels map[string]string
var logger OldLogger
// Initialize this logger once
var once sync.Once
func init() {
once.Do(initLogger)
}
func initLogger() {
levels = map[string]string{
"debug": "debug",
"info": "info",
"warn": "warn",
"error": "error",
"crit": "critical",
"none": "off",
}
level = DEFAULT_LOGLEVEL
logger = &Shim{}
envLevel := os.Getenv(LOGLEVEL_ENV_VAR)
logfile = os.Getenv(LOGFILE_ENV_VAR)
SetLevel(envLevel)
reloadConfig()
}
func reloadConfig() {
logger, err := log.LoggerFromConfigAsString(loggerConfig())
if err == nil {
log.ReplaceLogger(logger)
} else {
log.Error(err)
}
}
// SetLevel sets the log level for logging
func SetLevel(logLevel string) {
parsedLevel, ok := levels[strings.ToLower(logLevel)]
if ok {
level = parsedLevel
reloadConfig()
}
}
// ForModule returns an OldLogger instance. OldLogger is deprecated and kept
// for compatibility reasons. Prefer using Seelog directly.
func ForModule(module string) OldLogger {
once.Do(initLogger)
return logger.New("module", module)
}