package sgfw import ( "os" "syscall" "unsafe" "fmt" "github.com/op/go-logging" ) // Log level conversion map var LevelToID = map[int32]string{ int32(logging.ERROR): "error", int32(logging.WARNING): "warning", int32(logging.NOTICE): "notice", int32(logging.INFO): "info", int32(logging.DEBUG): "debug", } // Log level string conversion var IDToLevel = func() map[string]int32 { m := make(map[string]int32) for k, v := range LevelToID { m[v] = k } return m }() var log = logging.MustGetLogger("sgfw") var logFormat = logging.MustStringFormatter( "%{level:.4s} %{id:03x} %{message}", ) var ttyFormat = logging.MustStringFormatter( "%{color}%{time:15:04:05} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}", ) const ioctlReadTermios = 0x5401 func isTerminal(fd int) bool { var termios syscall.Termios _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0) return err == 0 } func setupLoggerBackend(lvl logging.Level) (logging.LeveledBackend, logging.LeveledBackend) { format := logFormat sleveler := logging.LeveledBackend(nil) if isTerminal(int(os.Stderr.Fd())) { format = ttyFormat fmt.Fprintf(os.Stderr, "Program was launched from a terminal; forcing output to syslog.\n") sbackend, err := logging.NewSyslogBackend("sgfw") if err != nil { log.Error("Could not open syslog backend for logging: %v", err) } else { sformatter := logging.NewBackendFormatter(sbackend, logFormat) sleveler = logging.AddModuleLevel(sformatter) sleveler.SetLevel(lvl, "sgfw") } } backend := logging.NewLogBackend(os.Stderr, "", 0) formatter := logging.NewBackendFormatter(backend, format) leveler := logging.AddModuleLevel(formatter) leveler.SetLevel(lvl, "sgfw") return leveler, sleveler }