add observer

stats/wrapper/conn.go

@@ -0,0 +1,222 @@
+package wrapper
+
+import (
+	"errors"
+	"io"
+	"net"
+	"syscall"
+
+	"github.com/go-gost/core/metadata"
+	xnet "github.com/go-gost/x/internal/net"
+	"github.com/go-gost/x/internal/net/udp"
+	"github.com/go-gost/x/stats"
+)
+
+var (
+	errUnsupport = errors.New("unsupported operation")
+)
+
+type conn struct {
+	net.Conn
+	stats *stats.Stats
+}
+
+func WrapConn(c net.Conn, stats *stats.Stats) net.Conn {
+	if stats == nil {
+		return c
+	}
+
+	return &conn{
+		Conn:  c,
+		stats: stats,
+	}
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	n, err = c.Conn.Read(b)
+	c.stats.Add(stats.KindInputBytes, int64(n))
+	return
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	n, err = c.Conn.Write(b)
+	c.stats.Add(stats.KindOutputBytes, int64(n))
+	return
+}
+
+func (c *conn) SyscallConn() (rc syscall.RawConn, err error) {
+	if sc, ok := c.Conn.(syscall.Conn); ok {
+		rc, err = sc.SyscallConn()
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *conn) Metadata() metadata.Metadata {
+	if md, ok := c.Conn.(metadata.Metadatable); ok {
+		return md.Metadata()
+	}
+	return nil
+}
+
+type packetConn struct {
+	net.PacketConn
+	stats *stats.Stats
+}
+
+func WrapPacketConn(pc net.PacketConn, stats *stats.Stats) net.PacketConn {
+	if stats == nil {
+		return pc
+	}
+	return &packetConn{
+		PacketConn: pc,
+		stats:      stats,
+	}
+}
+
+func (c *packetConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	n, addr, err = c.PacketConn.ReadFrom(p)
+	c.stats.Add(stats.KindInputBytes, int64(n))
+	return
+}
+
+func (c *packetConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	n, err = c.PacketConn.WriteTo(p, addr)
+	c.stats.Add(stats.KindOutputBytes, int64(n))
+	return
+}
+
+func (c *packetConn) Metadata() metadata.Metadata {
+	if md, ok := c.PacketConn.(metadata.Metadatable); ok {
+		return md.Metadata()
+	}
+	return nil
+}
+
+type udpConn struct {
+	net.PacketConn
+	stats *stats.Stats
+}
+
+func WrapUDPConn(pc net.PacketConn, stats *stats.Stats) udp.Conn {
+	return &udpConn{
+		PacketConn: pc,
+		stats:      stats,
+	}
+}
+
+func (c *udpConn) RemoteAddr() net.Addr {
+	if nc, ok := c.PacketConn.(xnet.RemoteAddr); ok {
+		return nc.RemoteAddr()
+	}
+	return nil
+}
+
+func (c *udpConn) SetReadBuffer(n int) error {
+	if nc, ok := c.PacketConn.(xnet.SetBuffer); ok {
+		return nc.SetReadBuffer(n)
+	}
+	return errUnsupport
+}
+
+func (c *udpConn) SetWriteBuffer(n int) error {
+	if nc, ok := c.PacketConn.(xnet.SetBuffer); ok {
+		return nc.SetWriteBuffer(n)
+	}
+	return errUnsupport
+}
+
+func (c *udpConn) Read(b []byte) (n int, err error) {
+	if nc, ok := c.PacketConn.(io.Reader); ok {
+		n, err = nc.Read(b)
+		c.stats.Add(stats.KindInputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	n, addr, err = c.PacketConn.ReadFrom(p)
+	c.stats.Add(stats.KindInputBytes, int64(n))
+	return
+}
+
+func (c *udpConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
+	if nc, ok := c.PacketConn.(udp.ReadUDP); ok {
+		n, addr, err = nc.ReadFromUDP(b)
+		c.stats.Add(stats.KindInputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error) {
+	if nc, ok := c.PacketConn.(udp.ReadUDP); ok {
+		n, oobn, flags, addr, err = nc.ReadMsgUDP(b, oob)
+		c.stats.Add(stats.KindInputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) Write(b []byte) (n int, err error) {
+	if nc, ok := c.PacketConn.(io.Writer); ok {
+		n, err = nc.Write(b)
+		c.stats.Add(stats.KindOutputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	n, err = c.PacketConn.WriteTo(p, addr)
+	c.stats.Add(stats.KindOutputBytes, int64(n))
+	return
+}
+
+func (c *udpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error) {
+	if nc, ok := c.PacketConn.(udp.WriteUDP); ok {
+		n, err = nc.WriteToUDP(b, addr)
+		c.stats.Add(stats.KindOutputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error) {
+	if nc, ok := c.PacketConn.(udp.WriteUDP); ok {
+		n, oobn, err = nc.WriteMsgUDP(b, oob, addr)
+		c.stats.Add(stats.KindOutputBytes, int64(n))
+		return
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) SyscallConn() (rc syscall.RawConn, err error) {
+	if nc, ok := c.PacketConn.(syscall.Conn); ok {
+		return nc.SyscallConn()
+	}
+	err = errUnsupport
+	return
+}
+
+func (c *udpConn) SetDSCP(n int) error {
+	if nc, ok := c.PacketConn.(xnet.SetDSCP); ok {
+		return nc.SetDSCP(n)
+	}
+	return nil
+}
+
+func (c *udpConn) Metadata() metadata.Metadata {
+	if md, ok := c.PacketConn.(metadata.Metadatable); ok {
+		return md.Metadata()
+	}
+	return nil
+}

stats/wrapper/io.go

@@ -0,0 +1,38 @@
+package wrapper
+
+import (
+	"io"
+
+	"github.com/go-gost/x/stats"
+)
+
+// readWriter is an io.ReadWriter with Stats.
+type readWriter struct {
+	io.ReadWriter
+	stats *stats.Stats
+}
+
+func WrapReadWriter(rw io.ReadWriter, stats *stats.Stats) io.ReadWriter {
+	if stats == nil {
+		return rw
+	}
+
+	return &readWriter{
+		ReadWriter: rw,
+		stats:      stats,
+	}
+}
+
+func (p *readWriter) Read(b []byte) (n int, err error) {
+	n, err = p.ReadWriter.Read(b)
+	p.stats.Add(stats.KindInputBytes, int64(n))
+
+	return
+}
+
+func (p *readWriter) Write(b []byte) (n int, err error) {
+	n, err = p.ReadWriter.Write(b)
+	p.stats.Add(stats.KindOutputBytes, int64(n))
+
+	return
+}

stats/wrapper/listener.go

@@ -0,0 +1,32 @@
+package wrapper
+
+import (
+	"net"
+
+	"github.com/go-gost/x/stats"
+)
+
+type listener struct {
+	stats *stats.Stats
+	net.Listener
+}
+
+func WrapListener(ln net.Listener, stats *stats.Stats) net.Listener {
+	if stats == nil {
+		return ln
+	}
+
+	return &listener{
+		stats:    stats,
+		Listener: ln,
+	}
+}
+
+func (ln *listener) Accept() (net.Conn, error) {
+	c, err := ln.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+
+	return WrapConn(c, ln.stats), nil
+}