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log.go
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log.go
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package log
import (
"io"
stdlog "log"
"os"
)
const logFlags = stdlog.Ldate | stdlog.Ltime | stdlog.Lmicroseconds | stdlog.Lshortfile | stdlog.LUTC | stdlog.Lmsgprefix
// Copies methods of standard library log.
type Printer interface {
Print(v ...any)
Printf(format string, v ...any)
Println(v ...any)
}
type Logger interface {
Debug() Printer
Info() Printer
Warn() Printer
Error() Printer
Prefix(prefix string) Logger
}
type logger struct {
debug, info, warn, error *stdlog.Logger
}
func NewDefaultLogger() Logger {
return &logger{
// io.Discard is magic value, which prevents arguments from being formatted to a string
debug: stdlog.New(io.Discard, "DEBUG ", logFlags),
info: stdlog.New(os.Stdout, "INFO ", logFlags),
warn: stdlog.New(os.Stdout, "WARN ", logFlags),
error: stdlog.New(os.Stderr, "ERROR ", logFlags),
}
}
func NewDiscardLogger() Logger {
discard := stdlog.New(io.Discard, "", 0)
return &logger{
debug: discard,
info: discard,
warn: discard,
error: discard,
}
}
func (l *logger) Debug() Printer { return l.debug }
func (l *logger) Error() Printer { return l.error }
func (l *logger) Info() Printer { return l.info }
func (l *logger) Warn() Printer { return l.warn }
func (l *logger) Prefix(prefix string) Logger {
return &logger{
debug: stdlog.New(l.debug.Writer(), l.debug.Prefix()+prefix+" ", l.debug.Flags()),
info: stdlog.New(l.info.Writer(), l.info.Prefix()+prefix+" ", l.info.Flags()),
warn: stdlog.New(l.warn.Writer(), l.warn.Prefix()+prefix+" ", l.warn.Flags()),
error: stdlog.New(l.error.Writer(), l.error.Prefix()+prefix+" ", l.error.Flags()),
}
}