package log
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import (
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"sync"
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"github.com/v2fly/v2ray-core/v5/common/serial"
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)
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// Message is the interface for all log messages.
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type Message interface {
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String() string
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}
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// Handler is the interface for log handler.
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type Handler interface {
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Handle(msg Message)
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}
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// Follower is the interface for following logs.
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type Follower interface {
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AddFollower(func(msg Message))
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RemoveFollower(func(msg Message))
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}
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// GeneralMessage is a general log message that can contain all kind of content.
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type GeneralMessage struct {
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Severity Severity
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Content interface{}
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}
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// String implements Message.
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func (m *GeneralMessage) String() string {
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return serial.Concat("[", m.Severity, "] ", m.Content)
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}
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// Record writes a message into log stream.
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func Record(msg Message) {
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logHandler.Handle(msg)
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}
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var logHandler syncHandler
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// RegisterHandler register a new handler as current log handler. Previous registered handler will be discarded.
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func RegisterHandler(handler Handler) {
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if handler == nil {
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panic("Log handler is nil")
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}
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logHandler.Set(handler)
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}
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type syncHandler struct {
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sync.RWMutex
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Handler
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}
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func (h *syncHandler) Handle(msg Message) {
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h.RLock()
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defer h.RUnlock()
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if h.Handler != nil {
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h.Handler.Handle(msg)
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}
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}
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func (h *syncHandler) Set(handler Handler) {
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h.Lock()
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defer h.Unlock()
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h.Handler = handler
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}
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