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/*
* Copyright 2018 Intel Corporation, Inc
*
* 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
import (
"fmt"
"log"
"os"
)
var errL, warnL, infoL *log.Logger
var stdErr, stdWarn, stdInfo *log.Logger
// Init will be called by sms.go before any other packages use it
func Init(filePath string) {
stdErr = log.New(os.Stderr, "ERROR: ", log.Lshortfile|log.LstdFlags)
stdWarn = log.New(os.Stdout, "WARNING: ", log.Lshortfile|log.LstdFlags)
stdInfo = log.New(os.Stdout, "INFO: ", log.Lshortfile|log.LstdFlags)
if filePath == "" {
// We will just to std streams
return
}
f, err := os.Create(filePath)
if err != nil {
stdErr.Println("Unable to create log file: " + err.Error())
return
}
errL = log.New(f, "ERROR: ", log.Lshortfile|log.LstdFlags)
warnL = log.New(f, "WARNING: ", log.Lshortfile|log.LstdFlags)
infoL = log.New(f, "INFO: ", log.Lshortfile|log.LstdFlags)
}
// WriteError writes output to the writer we have
// defined during its creation with ERROR prefix
func WriteError(msg string) {
if errL != nil {
errL.Output(2, fmt.Sprintln(msg))
}
if stdErr != nil {
stdErr.Output(2, fmt.Sprintln(msg))
}
}
// WriteWarn writes output to the writer we have
// defined during its creation with WARNING prefix
func WriteWarn(msg string) {
if warnL != nil {
warnL.Output(2, fmt.Sprintln(msg))
}
if stdWarn != nil {
stdWarn.Output(2, fmt.Sprintln(msg))
}
}
// WriteInfo writes output to the writer we have
// defined during its creation with INFO prefix
func WriteInfo(msg string) {
if infoL != nil {
infoL.Output(2, fmt.Sprintln(msg))
}
if stdInfo != nil {
stdInfo.Output(2, fmt.Sprintln(msg))
}
}
//CheckError is a helper function to reduce
//repitition of error checkign blocks of code
func CheckError(err error, topic string) error {
if err != nil {
msg := topic + ": " + err.Error()
if errL != nil {
errL.Output(2, fmt.Sprintln(msg))
}
if stdErr != nil {
stdErr.Output(2, fmt.Sprintln(msg))
}
return err
}
return nil
}
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