package log // import "v2ray.com/core/common/log" import ( "sync" "v2ray.com/core/common/serial" ) // Message is the interface for all log messages. type Message interface { String() string } // Handler is the interface for log handler. type Handler interface { Handle(msg Message) } // GeneralMessage is a general log message that can contain all kind of content. type GeneralMessage struct { Severity Severity Content interface{} } // String implements Message. func (m *GeneralMessage) String() string { return serial.Concat("[", m.Severity, "] ", m.Content) } // Record writes a message into log stream. func Record(msg Message) { logHandler.Handle(msg) } var ( logHandler syncHandler ) // RegisterHandler register a new handler as current log handler. Previous registered handler will be discarded. func RegisterHandler(handler Handler) { if handler == nil { panic("Log handler is nil") } logHandler.Set(handler) } type syncHandler struct { sync.RWMutex Handler } func (h *syncHandler) Handle(msg Message) { h.RLock() defer h.RUnlock() if h.Handler != nil { h.Handler.Handle(msg) } } func (h *syncHandler) Set(handler Handler) { h.Lock() defer h.Unlock() h.Handler = handler }