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add nullLogger to disable logging #670

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add nullLogger to disable logging #670

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31 changes: 31 additions & 0 deletions logger.go
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,33 @@ type Logger interface {
Panicf(format string, v ...interface{})
}

// nullLogger is a Logger that does nothing.
type nullLogger struct{}

func (nullLogger) Fatal(_ ...interface{}) {
// Do nothing
}

func (nullLogger) Fatalf(_ string, _ ...interface{}) {
// Do nothing
}

func (nullLogger) Print(_ ...interface{}) {
// Do nothing
}

func (nullLogger) Printf(_ string, _ ...interface{}) {
// Do nothing
}

func (nullLogger) Panic(_ ...interface{}) {
// Do nothing
}

func (nullLogger) Panicf(_ string, _ ...interface{}) {
// Do nothing
}

// LoggingCollector provides different methods for collecting and classifying
// log messages.
type LoggingCollector interface {
Expand Down Expand Up @@ -324,6 +351,10 @@ func LC() LoggingCollector {
return defaultLoggingCollector
}

func DisableLogging() {
defaultLoggingCollector.SetLogger(nullLogger{})
}

func init() {
if logLevel := strings.ToUpper(os.Getenv("UPPER_DB_LOG")); logLevel != "" {
for ll := range logLevels {
Expand Down