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package log
import (
"fmt"
"log"
"os"
"path"
"github.com/eduvpn/eduvpn-common/internal/util"
"github.com/eduvpn/eduvpn-common/types"
)
type FileLogger struct {
Level LogLevel
File *os.File
}
type LogLevel int8
const (
// No level set, not allowed
LOG_NOTSET LogLevel = iota
// Log info, this message is not an error
LOG_INFO
// Log only to provide a warning, the app still functions
LOG_WARNING
// Log to provide a generic error, the app still functions but some functionality might not work
LOG_ERROR
// Log to provide a fatal error, the app cannot function correctly when such an error occurs
LOG_FATAL
)
func (e LogLevel) String() string {
switch e {
case LOG_NOTSET:
return "NOTSET"
case LOG_INFO:
return "INFO"
case LOG_WARNING:
return "WARNING"
case LOG_ERROR:
return "ERROR"
case LOG_FATAL:
return "FATAL"
default:
return "UNKNOWN"
}
}
func (logger *FileLogger) Init(level LogLevel, name string, directory string) error {
errorMessage := "failed creating log"
configDirErr := util.EnsureDirectory(directory)
if configDirErr != nil {
return &types.WrappedErrorMessage{Message: errorMessage, Err: configDirErr}
}
logFile, logOpenErr := os.OpenFile(
logger.getFilename(directory, name),
os.O_RDWR|os.O_CREATE|os.O_APPEND,
0o666,
)
if logOpenErr != nil {
return &types.WrappedErrorMessage{Message: errorMessage, Err: logOpenErr}
}
log.SetOutput(logFile)
logger.File = logFile
logger.Level = level
return nil
}
func (logger *FileLogger) Inherit(err error, msg string) {
level := types.GetErrorLevel(err)
switch level {
case types.ERR_INFO:
logger.Info(msg)
case types.ERR_WARNING:
logger.Warning(msg)
case types.ERR_OTHER:
logger.Error(msg)
case types.ERR_FATAL:
logger.Fatal(msg)
}
}
func (logger *FileLogger) Info(msg string) {
logger.log(LOG_INFO, msg)
}
func (logger *FileLogger) Warning(msg string) {
logger.log(LOG_WARNING, msg)
}
func (logger *FileLogger) Error(msg string) {
logger.log(LOG_ERROR, msg)
}
func (logger *FileLogger) Fatal(msg string) {
logger.log(LOG_FATAL, msg)
}
func (logger *FileLogger) Close() {
logger.File.Close()
}
func (logger *FileLogger) getFilename(directory string, name string) string {
pathString := path.Join(directory, name)
return fmt.Sprintf("%s.log", pathString)
}
func (logger *FileLogger) log(level LogLevel, str string) {
if level >= logger.Level && logger.Level != LOG_NOTSET {
msg := fmt.Sprintf("[%s]: %s", level.String(), str)
// To log file
log.Println(msg)
// To output
fmt.Println(msg)
}
}
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