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logger.go
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logger.go
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package common
import (
"io"
"io/ioutil"
"log"
"os"
)
const (
// UNSPECIFIED logs nothing
UNSPECIFIED Level = iota // 0 :
// TRACE logs everything
TRACE // 1
// INFO logs Info, Warnings and Errors
INFO // 2
// WARNING logs Warning and Errors
WARNING // 3
// ERROR just logs Errors
ERROR // 4
)
// Level holds the log level.
type Level int
// Package level variables, which are pointer to log.Logger.
var (
Trace *log.Logger
Info *log.Logger
Warning *log.Logger
Error *log.Logger
)
// initLog initializes log.Logger objects
func initLog(
traceHandle io.Writer,
infoHandle io.Writer,
warningHandle io.Writer,
errorHandle io.Writer,
isFlag bool) {
// Flags for defines the logging properties, to log.New
flag := 0
if isFlag {
flag = log.Ldate | log.Ltime | log.Lshortfile
}
// Create log.Logger objects.
Trace = log.New(traceHandle, "TRACE: ", flag)
Info = log.New(infoHandle, "INFO: ", flag)
Warning = log.New(warningHandle, "WARNING: ", flag)
Error = log.New(errorHandle, "ERROR: ", flag)
}
// SetLogLevel sets the logging level preference
func setLogLevel(level Level) {
// Creates os.*File, which has implemented io.Writer intreface
f, err := os.OpenFile("logs.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
log.Fatalf("Error opening log file: %s", err.Error())
}
// Calls function initLog by specifying log level preference.
switch level {
case TRACE:
initLog(f, f, f, f, true)
return
case INFO:
initLog(ioutil.Discard, f, f, f, true)
return
case WARNING:
initLog(ioutil.Discard, ioutil.Discard, f, f, true)
return
case ERROR:
initLog(ioutil.Discard, ioutil.Discard, ioutil.Discard, f, true)
return
default:
initLog(ioutil.Discard, ioutil.Discard, ioutil.Discard, ioutil.Discard, false)
f.Close()
return
}
}