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logger.go
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logger.go
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// Licensed to NASA JPL under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. NASA JPL 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
//
// 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.
// A common logging interface used throughout the code which has implementations using stdout and AWS cloudwatch.
// Log levels are settable (DEBUG, INFO, ERROR) and there are implementations which provide less verbosity for use
// in things like Example unit tests.
package logger
import (
"errors"
"fmt"
)
// LogLevel - log level type
type LogLevel int
const (
// LogDebug - DEBUG log level
LogDebug LogLevel = iota
// LogInfo - INFO log level
LogInfo LogLevel = iota
// LogError - ERROR log level (does not call os.Exit!)
LogError LogLevel = iota
)
var logLevelPrefix = map[LogLevel]string{
LogDebug: "DEBUG",
LogInfo: "INFO",
LogError: "ERROR",
}
func GetLogLevelName(level LogLevel) (string, error) {
name, ok := logLevelPrefix[level]
if !ok {
return "", fmt.Errorf("Invalid log level: %v", level)
}
return name, nil
}
func GetLogLevel(name string) (LogLevel, error) {
for lev, levName := range logLevelPrefix {
if levName == name {
return lev, nil
}
}
return LogDebug, errors.New("Invalid log level name: " + name)
}
// ILogger - Generic logger interface
type ILogger interface {
Printf(level LogLevel, format string, a ...interface{})
Debugf(format string, a ...interface{})
Infof(format string, a ...interface{})
Errorf(format string, a ...interface{})
SetLogLevel(level LogLevel)
GetLogLevel() LogLevel
Close()
}
// This can be called from anywhere that wants to handle a panic gracefully and ensure that
// any logging is done (eg completing sending to cloudwatch)
func HandlePanicWithLog(withLog ILogger) {
err := recover()
if err != nil {
withLog.Errorf("PANIC %v", err)
// Wait for the above and other msgs to get sent to cloudwatch
withLog.Close()
panic(err)
//os.Exit(1)
}
}