195 lines
3.5 KiB
Go
195 lines
3.5 KiB
Go
package control
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import (
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"context"
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"encoding/json"
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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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}
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func (c *Control) Init(ctx context.Context, sess *smux.Session, serverMode bool) error {
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config := smux.DefaultConfig()
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config.Version = 2
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logger.Debug(ctx, "creating control stream")
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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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if serverMode {
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stream, err = sess.AcceptStream()
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if err != nil {
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return errors.WithStack(err)
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}
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} else {
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stream, err = sess.OpenStream()
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if err != nil {
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return errors.WithStack(err)
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}
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}
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c.stream = stream
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c.decoder = json.NewDecoder(stream)
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c.encoder = json.NewEncoder(stream)
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return nil
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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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func (c *Control) ProxyReq(ctx context.Context, network, address string) error {
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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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if err := c.Write(req); 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) Listen(ctx context.Context, handlers Handlers) error {
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errChan := make(chan error)
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msgChan := make(chan *Message)
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dieChan := c.stream.GetDieCh()
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go func(msgChan chan *Message, errChan chan error) {
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for {
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logger.Debug(ctx, "reading next message")
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msg, err := c.Read()
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if err != nil {
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errChan <- errors.WithStack(err)
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close(errChan)
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close(msgChan)
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return
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}
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msgChan <- msg
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}
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}(msgChan, errChan)
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for {
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select {
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case <-ctx.Done():
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return nil
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case <-dieChan:
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return errors.WithStack(ErrStreamClosed)
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case err := <-errChan:
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return errors.WithStack(err)
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case msg := <-msgChan:
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go func() {
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subCtx := logger.With(ctx, logger.F("messageType", msg.Type))
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handler, exists := handlers[msg.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, msg)
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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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}
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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.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() *Control {
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return &Control{}
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}
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