cloudflared-mirror/logger/formatter.go

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package logger
import (
"fmt"
"runtime"
"time"
"github.com/acmacalister/skittles"
)
// Level of logging
type Level int
const (
// InfoLevel is for standard log messages
InfoLevel Level = iota
// DebugLevel is for messages that are intended for purposes debugging only
DebugLevel
// ErrorLevel is for error message to indicte something has gone wrong
ErrorLevel
// FatalLevel is for error message that log and kill the program with an os.exit(1)
FatalLevel
)
// Formatter is the base interface for formatting logging messages before writing them out
type Formatter interface {
Timestamp(Level, time.Time) string // format the timestamp string
Content(Level, string) string // format content string (color for terminal, etc)
}
// DefaultFormatter writes a simple structure timestamp and the message per log line
type DefaultFormatter struct {
format string
}
// NewDefaultFormatter creates the standard log formatter
// format is the time format to use for timestamp formatting
func NewDefaultFormatter(format string) Formatter {
return &DefaultFormatter{
format: format,
}
}
// Timestamp formats a log line timestamp with a brackets around them
func (f *DefaultFormatter) Timestamp(l Level, d time.Time) string {
if f.format == "" {
return ""
}
return fmt.Sprintf("[%s]: ", d.Format(f.format))
}
// Content just writes the log line straight to the sources
func (f *DefaultFormatter) Content(l Level, c string) string {
return c
}
// TerminalFormatter is setup for colored output
type TerminalFormatter struct {
format string
supportsColor bool
}
// NewTerminalFormatter creates a Terminal formatter for colored output
// format is the time format to use for timestamp formatting
func NewTerminalFormatter(format string) Formatter {
supportsColor := (runtime.GOOS != "windows")
return &TerminalFormatter{
format: format,
supportsColor: supportsColor,
}
}
// Timestamp returns the log level with a matching color to the log type
func (f *TerminalFormatter) Timestamp(l Level, d time.Time) string {
t := ""
dateStr := "[" + d.Format(f.format) + "] "
switch l {
case InfoLevel:
t = f.output("INFO", skittles.Cyan)
case ErrorLevel:
t = f.output("ERROR", skittles.Red)
case DebugLevel:
t = f.output("DEBUG", skittles.Yellow)
case FatalLevel:
t = f.output("FATAL", skittles.Red)
}
return t + dateStr
}
// Content just writes the log line straight to the sources
func (f *TerminalFormatter) Content(l Level, c string) string {
return c
}
func (f *TerminalFormatter) output(msg string, colorFunc func(interface{}) string) string {
if f.supportsColor {
return colorFunc(msg)
}
return msg
}