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63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
package util
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import (
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"log"
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"os"
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)
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// Logger can be used to report logging messages.
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// The native log.Logger type implements this interface.
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type Logger interface {
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Printf(format string, v ...interface{})
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Println(v ...interface{})
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Err(error)
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}
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// NullLogger is a logger ignoring any input.
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var NullLogger = nullLogger{}
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type nullLogger struct{}
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func (n *nullLogger) Printf(format string, v ...interface{}) {}
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func (n *nullLogger) Println(v ...interface{}) {}
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func (n *nullLogger) Err(err error) {}
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// StdLogger is a logger using the standard logger.
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type StdLogger struct {
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*log.Logger
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}
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func NewStdLogger(prefix string, flags int) StdLogger {
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return StdLogger{log.New(os.Stderr, prefix, flags)}
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}
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func (l StdLogger) Err(err error) {
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if err != nil {
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l.Printf("warning: %v", err)
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}
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}
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// ProxyLogger is a logger delegating to an underlying logger.
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// Can be used to change the active logger during runtime.
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type ProxyLogger struct {
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Logger Logger
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}
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func NewProxyLogger(logger Logger) *ProxyLogger {
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return &ProxyLogger{logger}
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}
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func (l *ProxyLogger) Printf(format string, v ...interface{}) {
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l.Logger.Printf(format, v...)
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}
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func (l *ProxyLogger) Println(v ...interface{}) {
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l.Logger.Println(v...)
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}
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func (l *ProxyLogger) Err(err error) {
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l.Logger.Err(err)
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}
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