package log
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import (
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"io"
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"log"
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"os"
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"time"
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"github.com/v2fly/v2ray-core/v5/common/platform"
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"github.com/v2fly/v2ray-core/v5/common/signal/done"
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"github.com/v2fly/v2ray-core/v5/common/signal/semaphore"
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)
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// Writer is the interface for writing logs.
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type Writer interface {
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Write(string) error
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io.Closer
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}
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// WriterCreator is a function to create LogWriters.
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type WriterCreator func() Writer
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type generalLogger struct {
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creator WriterCreator
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buffer chan Message
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access *semaphore.Instance
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done *done.Instance
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}
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// NewLogger returns a generic log handler that can handle all type of messages.
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func NewLogger(logWriterCreator WriterCreator) Handler {
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return &generalLogger{
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creator: logWriterCreator,
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buffer: make(chan Message, 16),
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access: semaphore.New(1),
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done: done.New(),
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}
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}
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func (l *generalLogger) run() {
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defer l.access.Signal()
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dataWritten := false
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ticker := time.NewTicker(time.Minute)
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defer ticker.Stop()
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logger := l.creator()
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if logger == nil {
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return
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}
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defer logger.Close()
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for {
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select {
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case <-l.done.Wait():
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return
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case msg := <-l.buffer:
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logger.Write(msg.String() + platform.LineSeparator())
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dataWritten = true
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case <-ticker.C:
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if !dataWritten {
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return
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}
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dataWritten = false
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}
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}
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}
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func (l *generalLogger) Handle(msg Message) {
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select {
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case l.buffer <- msg:
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default:
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}
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select {
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case <-l.access.Wait():
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go l.run()
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default:
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}
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}
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func (l *generalLogger) Close() error {
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return l.done.Close()
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}
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type consoleLogWriter struct {
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logger *log.Logger
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}
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func (w *consoleLogWriter) Write(s string) error {
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w.logger.Print(s)
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return nil
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}
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func (w *consoleLogWriter) Close() error {
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return nil
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}
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type fileLogWriter struct {
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file *os.File
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logger *log.Logger
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}
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func (w *fileLogWriter) Write(s string) error {
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w.logger.Print(s)
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return nil
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}
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func (w *fileLogWriter) Close() error {
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return w.file.Close()
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}
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// CreateStdoutLogWriter returns a LogWriterCreator that creates LogWriter for stdout.
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func CreateStdoutLogWriter() WriterCreator {
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return func() Writer {
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return &consoleLogWriter{
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logger: log.New(os.Stdout, "", log.Ldate|log.Ltime),
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}
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}
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}
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// CreateStderrLogWriter returns a LogWriterCreator that creates LogWriter for stderr.
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func CreateStderrLogWriter() WriterCreator {
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return func() Writer {
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return &consoleLogWriter{
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logger: log.New(os.Stderr, "", log.Ldate|log.Ltime),
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}
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}
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}
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// CreateFileLogWriter returns a LogWriterCreator that creates LogWriter for the given file.
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func CreateFileLogWriter(path string) (WriterCreator, error) {
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file, err := os.OpenFile(path, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
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if err != nil {
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return nil, err
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}
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file.Close()
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return func() Writer {
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file, err := os.OpenFile(path, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
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if err != nil {
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return nil
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}
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return &fileLogWriter{
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file: file,
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logger: log.New(file, "", log.Ldate|log.Ltime),
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}
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}, nil
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}
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func init() {
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RegisterHandler(NewLogger(CreateStdoutLogWriter()))
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}
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