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default_logger.go
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default_logger.go
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package log
import (
"fmt"
"io"
"sync"
"github.com/apex/log"
"github.com/heroku/color"
)
var _ Logger = &DefaultLogger{}
var _ LoggerHandlerWithLevel = &DefaultLogger{}
// DefaultLogger extends `github.com/apex/log` `log.Logger`
type DefaultLogger struct {
*log.Logger
}
func NewDefaultLogger(writer io.Writer) *DefaultLogger {
return &DefaultLogger{
Logger: &log.Logger{
Handler: &handler{
writer: writer,
},
},
}
}
func (l *DefaultLogger) HandleLog(entry *log.Entry) error {
return l.Handler.HandleLog(entry)
}
func (l *DefaultLogger) LogLevel() log.Level {
return l.Level
}
func (l *DefaultLogger) Phase(name string) {
l.Infof(phaseStyle("===> %s", name))
}
func (l *DefaultLogger) SetLevel(requested string) error {
var err error
l.Level, err = log.ParseLevel(requested)
if err != nil {
return fmt.Errorf("failed to parse log level: %w", err)
}
return nil
}
var _ log.Handler = &handler{}
type handler struct {
mu sync.Mutex
writer io.Writer
}
const (
errorLevelText = "ERROR: "
warnLevelText = "Warning: "
)
var (
warnStyle = color.New(color.FgYellow, color.Bold).SprintfFunc()
errorStyle = color.New(color.FgRed, color.Bold).SprintfFunc()
phaseStyle = color.New(color.FgCyan).SprintfFunc()
)
func (h *handler) HandleLog(entry *log.Entry) error {
h.mu.Lock()
defer h.mu.Unlock()
var err error
switch entry.Level {
case log.WarnLevel:
_, err = h.writer.Write([]byte(warnStyle(warnLevelText) + appendMissingLineFeed(entry.Message)))
case log.ErrorLevel:
_, err = h.writer.Write([]byte(errorStyle(errorLevelText) + appendMissingLineFeed(entry.Message)))
default:
_, err = h.writer.Write([]byte(appendMissingLineFeed(entry.Message)))
}
return err
}
func appendMissingLineFeed(msg string) string {
buff := []byte(msg)
if buff[len(buff)-1] != '\n' {
buff = append(buff, '\n')
}
return string(buff)
}