disable logging completely

vendor/github.com/lucas-clemente/quic-go/internal/utils/log.go

@@ -1,13 +1,5 @@
 package utils
 
-import (
-	"fmt"
-	"log"
-	"os"
-	"strings"
-	"time"
-)
-
 // LogLevel of quic-go
 type LogLevel uint8
 
@@ -22,8 +14,6 @@ const (
 	LogLevelDebug
 )
 
-const logEnv = "QUIC_GO_LOG_LEVEL"
-
 // A Logger logs.
 type Logger interface {
 	SetLogLevel(LogLevel)
@@ -39,93 +29,36 @@ type Logger interface {
 // DefaultLogger is used by quic-go for logging.
 var DefaultLogger Logger
 
-type defaultLogger struct {
-	prefix string
-
-	logLevel   LogLevel
-	timeFormat string
-}
+type defaultLogger struct{}
 
 var _ Logger = &defaultLogger{}
 
 // SetLogLevel sets the log level
 func (l *defaultLogger) SetLogLevel(level LogLevel) {
-	l.logLevel = level
 }
 
 // SetLogTimeFormat sets the format of the timestamp
 // an empty string disables the logging of timestamps
-func (l *defaultLogger) SetLogTimeFormat(format string) {
-	log.SetFlags(0) // disable timestamp logging done by the log package
-	l.timeFormat = format
-}
+func (l *defaultLogger) SetLogTimeFormat(format string) {}
 
 // Debugf logs something
-func (l *defaultLogger) Debugf(format string, args ...interface{}) {
-	if l.logLevel == LogLevelDebug {
-		l.logMessage(format, args...)
-	}
-}
+func (l *defaultLogger) Debugf(format string, args ...interface{}) {}
 
 // Infof logs something
-func (l *defaultLogger) Infof(format string, args ...interface{}) {
-	if l.logLevel >= LogLevelInfo {
-		l.logMessage(format, args...)
-	}
-}
+func (l *defaultLogger) Infof(format string, args ...interface{}) {}
 
 // Errorf logs something
-func (l *defaultLogger) Errorf(format string, args ...interface{}) {
-	if l.logLevel >= LogLevelError {
-		l.logMessage(format, args...)
-	}
-}
-
-func (l *defaultLogger) logMessage(format string, args ...interface{}) {
-	var pre string
-
-	if len(l.timeFormat) > 0 {
-		pre = time.Now().Format(l.timeFormat) + " "
-	}
-	if len(l.prefix) > 0 {
-		pre += l.prefix + " "
-	}
-	log.Printf(pre+format, args...)
-}
+func (l *defaultLogger) Errorf(format string, args ...interface{}) {}
 
 func (l *defaultLogger) WithPrefix(prefix string) Logger {
-	if len(l.prefix) > 0 {
-		prefix = l.prefix + " " + prefix
-	}
-	return &defaultLogger{
-		logLevel:   l.logLevel,
-		timeFormat: l.timeFormat,
-		prefix:     prefix,
-	}
+	return l
 }
 
 // Debug returns true if the log level is LogLevelDebug
 func (l *defaultLogger) Debug() bool {
-	return l.logLevel == LogLevelDebug
+	return false
 }
 
 func init() {
 	DefaultLogger = &defaultLogger{}
-	DefaultLogger.SetLogLevel(readLoggingEnv())
-}
-
-func readLoggingEnv() LogLevel {
-	switch strings.ToLower(os.Getenv(logEnv)) {
-	case "":
-		return LogLevelNothing
-	case "debug":
-		return LogLevelDebug
-	case "info":
-		return LogLevelInfo
-	case "error":
-		return LogLevelError
-	default:
-		fmt.Fprintln(os.Stderr, "invalid quic-go log level, see https://github.com/lucas-clemente/quic-go/wiki/Logging")
-		return LogLevelNothing
-	}
 }