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logger.go
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logger.go
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package logger
import (
"io"
"log"
"os"
"runtime"
"strings"
"sync"
"time"
)
var fileName string
var mux sync.Mutex
var initialized bool
var printConsole bool
var fpLog *os.File
var err error
var isOpen bool
var lastLogDate string
// SetFileName will set the log file name
// and re initialize the logger
func SetFileName(newFileName string) {
fileName = newFileName
initialized = false // in order to stop pollingData()
initialized = initialize()
}
func getNow() string {
return time.Now().Local().Format("2006-01-02")
}
// Log will write log string both on console and in file
func Log(v ...string) {
logDate := getNow()
// If last log date is yesterday, then reset to today
if lastLogDate != "" && strings.Compare(lastLogDate, logDate) == -1 {
fileName = ""
initialized = false
}
if fileName == "" {
fileName = getNow() + "_log.txt"
lastLogDate = getNow()
}
if initialized == false {
initialized = initialize()
}
functionName := getCallingFunctionName()
logStr := functionName + "() --> " + strings.Join(v[:], ", ")
log.Println(logStr)
}
// Debug will log parameters with Debug string in the beginning
func Debug(v ...string) {
v = append([]string{"***Debug***"}, v...)
logDate := getNow()
// If last log date is yesterday, then reset to today
if lastLogDate != "" && strings.Compare(lastLogDate, logDate) == -1 {
fileName = ""
initialized = false
}
if fileName == "" {
fileName = getNow() + "_log.txt"
lastLogDate = getNow()
}
if initialized == false {
initialized = initialize()
}
functionName := getCallingFunctionName()
logStr := functionName + "() --> " + strings.Join(v[:], ", ")
log.Println(logStr)
}
// Error will log parameters with Debug string in the beginning
func Error(v ...string) {
v = append([]string{"***Error ***"}, v...)
logDate := getNow()
// If last log date is yesterday, then reset to today
if lastLogDate != "" && strings.Compare(lastLogDate, logDate) == -1 {
fileName = ""
initialized = false
}
if fileName == "" {
fileName = getNow() + "_log.txt"
lastLogDate = getNow()
}
if initialized == false {
initialized = initialize()
}
functionName := getCallingFunctionName()
logStr := functionName + "() --> " + strings.Join(v[:], ", ")
log.Println(logStr)
}
func getCallingFunctionName() string {
fpcs := make([]uintptr, 1)
runtime.Callers(3, fpcs)
// get the info of the actual function that's in the pointer
return runtime.FuncForPC(fpcs[0] - 1).Name()
}
func openFile() {
fpLog, err = os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
panic(err)
}
isOpen = true
writer := io.MultiWriter(fpLog, os.Stdout)
log.SetOutput(writer)
}
func closeFile() {
if fpLog != nil {
fpLog.Close()
isOpen = false
}
}
func initialize() bool {
if isOpen == true {
closeFile()
}
openFile()
return true
}