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prefix.go
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/
prefix.go
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package logging
// prefixLogger is a logger that attaches a prefix to each log message.
type prefixLogger struct {
prefixFunc func() string
inner Logger
}
// Debugf implements Logger.
func (p *prefixLogger) Debugf(msg string, args ...interface{}) {
p.inner.Debugf(p.prefixFunc()+msg, args...)
}
// Debugw implements Logger.
func (p *prefixLogger) Debugw(msg string, keyValuePairs ...interface{}) {
p.inner.Debugw(p.prefixFunc()+msg, keyValuePairs...)
}
// Infof implements Logger.
func (p *prefixLogger) Infof(msg string, args ...interface{}) {
p.inner.Infof(p.prefixFunc()+msg, args...)
}
// Warnf implements Logger.
func (p *prefixLogger) Warnf(msg string, args ...interface{}) {
p.inner.Warnf(p.prefixFunc()+msg, args...)
}
// Errorf implements Logger.
func (p *prefixLogger) Errorf(msg string, args ...interface{}) {
p.inner.Errorf(p.prefixFunc()+msg, args...)
}
var _ Logger = (*prefixLogger)(nil)
// WithPrefix returns a wrapper logger that attaches given prefix to each message.
func WithPrefix(prefix string, logger Logger) Logger {
return &prefixLogger{func() string { return prefix }, logger}
}