106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
// Package tlog is a "toggled logger" that can be enabled and disabled and
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// provides coloring.
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package tlog
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import (
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"encoding/json"
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"fmt"
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"log"
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"os"
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"golang.org/x/crypto/ssh/terminal"
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)
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const (
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ProgramName = "gocryptfs"
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wpanicMsg = "-wpanic turns this warning into a panic: "
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)
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// Escape sequences for terminal colors. These will be empty strings if stdout
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// is not a terminal.
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var ColorReset, ColorGrey, ColorRed, ColorGreen, ColorYellow string
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func JSONDump(obj interface{}) string {
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b, err := json.MarshalIndent(obj, "", "\t")
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if err != nil {
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return err.Error()
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} else {
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return string(b)
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}
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}
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// toggledLogger - a Logger than can be enabled and disabled
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type toggledLogger struct {
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// Enable or disable output
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Enabled bool
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// Panic after logging a message, useful in regression tests
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Wpanic bool
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// Private prefix and postfix are used for coloring
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prefix string
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postfix string
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*log.Logger
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}
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func (l *toggledLogger) Printf(format string, v ...interface{}) {
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if !l.Enabled {
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return
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}
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l.Logger.Printf(l.prefix + fmt.Sprintf(format, v...) + l.postfix)
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if l.Wpanic {
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l.Logger.Panic(wpanicMsg + fmt.Sprintf(format, v...))
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}
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}
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func (l *toggledLogger) Println(v ...interface{}) {
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if !l.Enabled {
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return
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}
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l.Logger.Println(l.prefix + fmt.Sprint(v...) + l.postfix)
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if l.Wpanic {
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l.Logger.Panic(wpanicMsg + fmt.Sprint(v...))
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}
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}
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// Debug messages
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// Can be enabled by passing "-d"
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var Debug *toggledLogger
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// Informational message
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// Can be disabled by passing "-q"
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var Info *toggledLogger
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// A warning, meaning nothing serious by itself but might indicate problems.
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// Passing "-wpanic" will make this function panic after printing the message.
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var Warn *toggledLogger
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// Fatal error, we are about to exit
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var Fatal *toggledLogger
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func init() {
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if terminal.IsTerminal(int(os.Stdout.Fd())) {
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ColorReset = "\033[0m"
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ColorGrey = "\033[2m"
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ColorRed = "\033[31m"
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ColorGreen = "\033[32m"
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ColorYellow = "\033[33m"
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}
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Debug = &toggledLogger{
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Logger: log.New(os.Stdout, "", 0),
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}
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Info = &toggledLogger{
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Enabled: true,
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Logger: log.New(os.Stdout, "", 0),
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}
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Warn = &toggledLogger{
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Enabled: true,
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Logger: log.New(os.Stderr, "", 0),
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}
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Fatal = &toggledLogger{
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Enabled: true,
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Logger: log.New(os.Stderr, "", 0),
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prefix: ColorRed,
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postfix: ColorReset,
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}
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}
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