168 lines
3.2 KiB
Go
168 lines
3.2 KiB
Go
package control
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import (
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"context"
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"encoding/json"
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"net"
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"time"
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"github.com/pkg/errors"
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"github.com/xtaci/smux"
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"gitlab.com/wpetit/goweb/logger"
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)
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type Control struct {
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encoder *json.Encoder
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decoder *json.Decoder
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stream *smux.Stream
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sess *smux.Session
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}
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func (c *Control) AuthRequest(credentials interface{}) (bool, error) {
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req := NewMessage(TypeAuthRequest, &AuthRequestPayload{
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Credentials: credentials,
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})
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res := NewMessage(TypeAuthResponse, nil)
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if err := c.reqRes(req, res); err != nil {
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return false, errors.WithStack(err)
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}
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authResPayload, ok := res.Payload.(*AuthResponsePayload)
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if !ok {
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return false, errors.WithStack(ErrUnexpectedMessage)
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}
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return authResPayload.Success, nil
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}
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type CloseStream func()
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func (c *Control) Proxy(ctx context.Context, network, address string) (net.Conn, error) {
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var (
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stream *smux.Stream
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err error
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)
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req := NewMessage(TypeProxyRequest, &ProxyRequestPayload{
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Network: network,
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Address: address,
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})
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ctx = logger.With(ctx, logger.F("network", network), logger.F("address", address))
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logger.Debug(ctx, "proxying")
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if err := c.Write(req); err != nil {
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return nil, errors.WithStack(err)
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}
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logger.Debug(ctx, "opening stream")
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stream, err = c.sess.AcceptStream()
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if err != nil {
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return nil, errors.WithStack(err)
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}
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return stream, nil
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}
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func (c *Control) Listen(ctx context.Context, handlers Handlers) error {
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for {
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logger.Debug(ctx, "reading next message")
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req, err := c.Read()
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if err != nil {
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return errors.WithStack(err)
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}
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go func() {
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subCtx := logger.With(ctx, logger.F("messageType", req.Type))
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handler, exists := handlers[req.Type]
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if !exists {
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logger.Error(subCtx, "no message handler registered")
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return
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}
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res, err := handler(subCtx, req)
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if err != nil {
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logger.Error(subCtx, "error while handling message", logger.E(err))
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return
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}
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if res == nil {
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return
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}
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if err := c.Write(res); err != nil {
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logger.Error(subCtx, "error while write message response", logger.E(err))
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return
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}
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}()
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}
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}
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func (c *Control) Read() (*Message, error) {
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message := &Message{}
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if err := c.read(message); err != nil {
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return nil, errors.WithStack(err)
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}
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return message, nil
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}
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func (c *Control) Write(m *Message) error {
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if err := c.write(m); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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func (c *Control) reqRes(req *Message, res *Message) error {
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if err := c.write(req); err != nil {
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return errors.WithStack(err)
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}
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if err := c.read(res); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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func (c *Control) read(m *Message) error {
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if err := c.decoder.Decode(m); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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func (c *Control) write(m *Message) error {
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if err := c.stream.SetWriteDeadline(time.Now().Add(time.Second)); err != nil {
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return errors.WithStack(err)
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}
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if err := c.encoder.Encode(m); err != nil {
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return errors.WithStack(err)
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}
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return nil
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}
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func New(sess *smux.Session, controlStream *smux.Stream) *Control {
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return &Control{
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encoder: json.NewEncoder(controlStream),
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decoder: json.NewDecoder(controlStream),
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sess: sess,
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stream: controlStream,
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}
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}
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