github.com/imannamdari/v2ray-core/v5@v5.0.5/transport/internet/udp/copy.go (about)

     1  package udp
     2  
     3  import (
     4  	gonet "net"
     5  
     6  	"github.com/imannamdari/v2ray-core/v5/common/signal"
     7  	"github.com/imannamdari/v2ray-core/v5/transport/internet"
     8  )
     9  
    10  type dataHandler func(content []byte, address gonet.Addr)
    11  
    12  type copyHandler struct {
    13  	onData []dataHandler
    14  }
    15  
    16  type CopyOption func(*copyHandler)
    17  
    18  func CopyPacketConn(dst internet.AbstractPacketConnWriter, src internet.AbstractPacketConnReader, options ...CopyOption) error {
    19  	var handler copyHandler
    20  	for _, option := range options {
    21  		option(&handler)
    22  	}
    23  	var buffer [2048]byte
    24  	for {
    25  		n, addr, err := src.ReadFrom(buffer[:])
    26  		if err != nil {
    27  			return err
    28  		}
    29  
    30  		for _, handler := range handler.onData {
    31  			handler(buffer[:n], addr)
    32  		}
    33  
    34  		_, err = dst.WriteTo(buffer[:n], addr)
    35  		if err != nil {
    36  			return err
    37  		}
    38  	}
    39  }
    40  
    41  func UpdateActivity(timer signal.ActivityUpdater) CopyOption {
    42  	return func(handler *copyHandler) {
    43  		handler.onData = append(handler.onData, func(content []byte, address gonet.Addr) {
    44  			timer.Update()
    45  		})
    46  	}
    47  }