Xray-core/common/net/connection.go

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2020-11-25 11:01:53 +00:00
package net
import (
"io"
"net"
"time"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/signal/done"
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)
type ConnectionOption func(*connection)
func ConnectionLocalAddr(a net.Addr) ConnectionOption {
return func(c *connection) {
c.local = a
}
}
func ConnectionRemoteAddr(a net.Addr) ConnectionOption {
return func(c *connection) {
c.remote = a
}
}
func ConnectionInput(writer io.Writer) ConnectionOption {
return func(c *connection) {
c.writer = buf.NewWriter(writer)
}
}
func ConnectionInputMulti(writer buf.Writer) ConnectionOption {
return func(c *connection) {
c.writer = writer
}
}
func ConnectionOutput(reader io.Reader) ConnectionOption {
return func(c *connection) {
c.reader = &buf.BufferedReader{Reader: buf.NewReader(reader)}
}
}
func ConnectionOutputMulti(reader buf.Reader) ConnectionOption {
return func(c *connection) {
c.reader = &buf.BufferedReader{Reader: reader}
}
}
func ConnectionOutputMultiUDP(reader buf.Reader) ConnectionOption {
return func(c *connection) {
c.reader = &buf.BufferedReader{
Reader: reader,
Spliter: buf.SplitFirstBytes,
}
}
}
func ConnectionOnClose(n io.Closer) ConnectionOption {
return func(c *connection) {
c.onClose = n
}
}
func NewConnection(opts ...ConnectionOption) net.Conn {
c := &connection{
done: done.New(),
local: &net.TCPAddr{
IP: []byte{0, 0, 0, 0},
Port: 0,
},
remote: &net.TCPAddr{
IP: []byte{0, 0, 0, 0},
Port: 0,
},
}
for _, opt := range opts {
opt(c)
}
return c
}
type connection struct {
reader *buf.BufferedReader
writer buf.Writer
done *done.Instance
onClose io.Closer
local Addr
remote Addr
}
func (c *connection) Read(b []byte) (int, error) {
return c.reader.Read(b)
}
// ReadMultiBuffer implements buf.Reader.
func (c *connection) ReadMultiBuffer() (buf.MultiBuffer, error) {
return c.reader.ReadMultiBuffer()
}
// Write implements net.Conn.Write().
func (c *connection) Write(b []byte) (int, error) {
if c.done.Done() {
return 0, io.ErrClosedPipe
}
l := len(b)
mb := make(buf.MultiBuffer, 0, l/buf.Size+1)
mb = buf.MergeBytes(mb, b)
return l, c.writer.WriteMultiBuffer(mb)
}
func (c *connection) WriteMultiBuffer(mb buf.MultiBuffer) error {
if c.done.Done() {
buf.ReleaseMulti(mb)
return io.ErrClosedPipe
}
return c.writer.WriteMultiBuffer(mb)
}
// Close implements net.Conn.Close().
func (c *connection) Close() error {
common.Must(c.done.Close())
common.Interrupt(c.reader)
common.Close(c.writer)
if c.onClose != nil {
return c.onClose.Close()
}
return nil
}
// LocalAddr implements net.Conn.LocalAddr().
func (c *connection) LocalAddr() net.Addr {
return c.local
}
// RemoteAddr implements net.Conn.RemoteAddr().
func (c *connection) RemoteAddr() net.Addr {
return c.remote
}
// SetDeadline implements net.Conn.SetDeadline().
func (c *connection) SetDeadline(t time.Time) error {
return nil
}
// SetReadDeadline implements net.Conn.SetReadDeadline().
func (c *connection) SetReadDeadline(t time.Time) error {
return nil
}
// SetWriteDeadline implements net.Conn.SetWriteDeadline().
func (c *connection) SetWriteDeadline(t time.Time) error {
return nil
}