/
server.go
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/
server.go
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package netapi
import (
"context"
"fmt"
"io"
"net"
"github.com/Asutorufa/yuhaiin/pkg/utils/pool"
"github.com/Asutorufa/yuhaiin/pkg/utils/system"
)
type Server interface {
io.Closer
}
type Listener interface {
Stream(context.Context) (net.Listener, error)
Packet(context.Context) (net.PacketConn, error)
Server
}
type ProtocolServer interface {
Server
AcceptStream() (*StreamMeta, error)
AcceptPacket() (*Packet, error)
}
type StreamMeta struct {
Source net.Addr
Destination net.Addr
Inbound net.Addr
Src net.Conn
Address Address
}
type WriteBack func(b []byte, addr net.Addr) (int, error)
type Packet struct {
Src net.Addr
Dst Address
WriteBack WriteBack
Payload *pool.Bytes
}
type DNSHandler interface {
Server
HandleUDP(context.Context, net.PacketConn) error
HandleTCP(context.Context, net.Conn) error
Do(context.Context, *pool.Bytes, func([]byte) error) error
}
var EmptyDNSServer DNSHandler = &emptyHandler{}
type emptyHandler struct{}
func (e *emptyHandler) Close() error { return nil }
func (e *emptyHandler) HandleUDP(context.Context, net.PacketConn) error { return io.EOF }
func (e *emptyHandler) HandleTCP(context.Context, net.Conn) error { return io.EOF }
func (e *emptyHandler) Do(_ context.Context, b *pool.Bytes, _ func([]byte) error) error {
pool.PutBytesBuffer(b)
return io.EOF
}
type ChannelListener struct {
ctx context.Context
cancel context.CancelFunc
channel chan net.Conn
addr net.Addr
}
func NewChannelListener(addr net.Addr) *ChannelListener {
ctx, cancel := context.WithCancel(context.Background())
return &ChannelListener{
addr: addr,
ctx: ctx,
cancel: cancel,
channel: make(chan net.Conn, system.Procs)}
}
func (c *ChannelListener) Accept() (net.Conn, error) {
select {
case <-c.ctx.Done():
return nil, c.ctx.Err()
case conn := <-c.channel:
return conn, nil
}
}
func (c *ChannelListener) NewConn(conn net.Conn) {
select {
case <-c.ctx.Done():
conn.Close()
case c.channel <- conn:
}
}
func (c *ChannelListener) Close() error {
c.cancel()
return nil
}
func (c *ChannelListener) Addr() net.Addr { return c.addr }
type WrapListener struct {
Listener
lis net.Listener
}
func ListenWrap(lis net.Listener, inbound Listener) *WrapListener {
return &WrapListener{
Listener: inbound,
lis: lis,
}
}
func (w *WrapListener) Stream(ctx context.Context) (net.Listener, error) {
return w.lis, nil
}
func (w *WrapListener) Close() error {
w.lis.Close()
return w.Listener.Close()
}
type EmptyPacketListener struct {
net.Listener
}
func NewEmptyPacketListener(lis net.Listener) Listener {
return &EmptyPacketListener{
Listener: lis,
}
}
func (e *EmptyPacketListener) Stream(ctx context.Context) (net.Listener, error) {
return e.Listener, nil
}
func (EmptyPacketListener) Packet(context.Context) (net.PacketConn, error) {
return nil, fmt.Errorf("not support")
}
type ChannelProtocolServer struct {
packetChan chan *Packet
streamChan chan *StreamMeta
ctx context.Context
cancel context.CancelFunc
}
func NewChannelProtocolServer() *ChannelProtocolServer {
ctx, cancel := context.WithCancel(context.Background())
return &ChannelProtocolServer{
packetChan: make(chan *Packet, 100),
streamChan: make(chan *StreamMeta, 100),
ctx: ctx,
cancel: cancel,
}
}
func (s *ChannelProtocolServer) AcceptPacket() (*Packet, error) {
select {
case <-s.ctx.Done():
return nil, s.ctx.Err()
case p := <-s.packetChan:
return p, nil
}
}
func (s *ChannelProtocolServer) AcceptStream() (*StreamMeta, error) {
select {
case <-s.ctx.Done():
return nil, s.ctx.Err()
case p := <-s.streamChan:
return p, nil
}
}
func (s *ChannelProtocolServer) Close() error {
s.cancel()
return nil
}
func (s *ChannelProtocolServer) NewPacket(packet *Packet) bool {
select {
case <-s.ctx.Done():
return false
case s.packetChan <- packet:
return true
}
}
func (s *ChannelProtocolServer) NewStream(stream *StreamMeta) bool {
select {
case <-s.ctx.Done():
return false
case s.streamChan <- stream:
return true
}
}
func (s *ChannelProtocolServer) Context() context.Context { return s.ctx }