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