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connection.go
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connection.go
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package nrgo
import (
"bytes"
"context"
"crypto/md5"
"encoding/hex"
"encoding/json"
"errors"
"git.nspix.com/golang/kos/pkg/log"
"git.nspix.com/golang/kos/util/bs"
"git.nspix.com/golang/kos/util/pool"
"github.com/uole/nrgo/internal/sequence"
"github.com/uole/nrgo/pkg/multiplex"
"github.com/uole/nrgo/pkg/multiplex/kcp"
"github.com/uole/nrgo/pkg/multiplex/quic"
"github.com/uole/nrgo/pkg/multiplex/tcp"
"github.com/uole/nrgo/pkg/packet"
"io"
"net"
"runtime"
"sync/atomic"
"time"
)
var (
defaultTimeout = time.Second * 5
)
const (
defaultBufferSize = 16 * 1024
protoQUIC = "quic"
protoKCP = "kcp"
protoTCP = "tcp"
)
type Connection struct {
id string
secretKey []byte
conn multiplex.Session
info *NodeInfo
dialer net.Dialer
concurrency int32
activeStamp int64
closeFlag int32
handshake Handshake
closeChan chan struct{}
}
func (conn *Connection) ID() string {
return conn.id
}
func (conn *Connection) pipe(dst, src io.ReadWriteCloser, ch chan<- error) {
var (
err error
)
buf := pool.GetBytes(defaultBufferSize)
defer pool.PutBytes(buf)
_, err = io.CopyBuffer(dst, src, buf)
select {
case ch <- err:
}
return
}
func (conn *Connection) handlePing(request *packet.Frame, stream multiplex.Stream) {
var (
err error
)
defer func() {
err = stream.Close()
}()
if err = packet.WriteFrame(
stream,
packet.NewFrame(
packet.TypeHandshakePong,
request.Sequence,
&packet.PongResponse{Timestamp: time.Now().Unix()},
),
); err != nil {
log.Debugf("connection %s write pong error: %s", conn.ID(), err.Error())
}
}
func (conn *Connection) handleTraffic(request *packet.Frame, stream multiplex.Stream) {
var (
err error
remote io.ReadWriteCloser
)
defer func() {
err = stream.Close()
}()
if remote, err = conn.handshake(request, stream); err != nil {
return
}
defer func() {
err = remote.Close()
}()
errChan := make(chan error, 2)
go conn.pipe(remote, stream, errChan)
go conn.pipe(stream, remote, errChan)
select {
case <-conn.closeChan:
err = io.ErrClosedPipe
case err = <-errChan:
}
}
func (conn *Connection) process(stream multiplex.Stream) {
var (
err error
frame *packet.Frame
)
atomic.StoreInt64(&conn.activeStamp, time.Now().Unix())
atomic.AddInt32(&conn.concurrency, 1)
defer func() {
atomic.AddInt32(&conn.concurrency, -1)
}()
if frame, err = packet.ReadFrame(stream); err != nil {
return
}
switch frame.Type {
case packet.TypeHandshakePing:
conn.handlePing(frame, stream)
case packet.TypeHandshakeRequest:
conn.handleTraffic(frame, stream)
default:
log.Debugf("connection %s receive unsupported request: %0x", conn.ID(), frame.Type)
err = stream.Close()
}
return
}
func (conn *Connection) Dial(ctx context.Context, network, addr string) (err error) {
var (
buf []byte
frame *packet.Frame
)
switch network {
case protoQUIC:
conn.conn, err = quic.Dial(ctx, addr)
case protoKCP:
conn.conn, err = kcp.Dial(ctx, addr, func(opts *kcp.Options) {
opts.Key = conn.secretKey
})
default:
conn.conn, err = tcp.Dial(ctx, addr, func(opts *tcp.Options) {
opts.Key = conn.secretKey
})
}
if err != nil {
return
}
req := &packet.RegisterRequest{
ID: conn.info.ID,
TID: conn.id,
OS: runtime.GOOS,
Name: conn.info.Name,
Country: conn.info.Country,
IP: conn.info.IP,
CPU: conn.info.CPU,
Uptime: conn.info.Uptime,
}
hash := md5.New()
hash.Write(conn.secretKey)
hash.Write(bs.StringToBytes(conn.id))
req.Secret = hex.EncodeToString(hash.Sum(nil))
if err = conn.conn.WriteMessage(packet.NewFrame(packet.TypeRegisterRequest, sequence.Next(), req).Bytes()); err != nil {
return
}
if buf, err = conn.conn.ReadMessage(); err != nil {
return
}
if frame, err = packet.ReadFrame(bytes.NewReader(buf)); err != nil {
return
}
res := &packet.RegisterResponse{}
if err = json.Unmarshal(frame.Buf, res); err != nil {
return
}
if !res.Success {
err = errors.New(res.Reason)
}
return
}
func (conn *Connection) Close() (err error) {
if !atomic.CompareAndSwapInt32(&conn.closeFlag, 0, 1) {
return
}
close(conn.closeChan)
err = conn.conn.Close()
return
}
func (conn *Connection) Closed() bool {
return atomic.LoadInt32(&conn.closeFlag) == 1
}
func (conn *Connection) Serve(ctx context.Context) error {
for {
if stream, err := conn.conn.AcceptStream(ctx); err != nil {
return err
} else {
go conn.process(stream)
}
}
}
func newConnection(id string, secretKey []byte, info *NodeInfo, h Handshake) *Connection {
conn := &Connection{
id: id,
handshake: h,
info: info,
secretKey: secretKey,
closeChan: make(chan struct{}),
}
return conn
}