Ejemplo n.º 1
0
func encodeMessageFromVom(header bindings.MessageHeader, argptrs []interface{}, t *vdl.Type) (*bindings.Message, error) {
	// Convert argptrs into their true form: []*vom.RawBytes
	inargs := make([]*vom.RawBytes, len(argptrs))
	for i := range argptrs {
		inargs[i] = *argptrs[i].(**vom.RawBytes)
	}

	encoder := bindings.NewEncoder()
	if err := header.Encode(encoder); err != nil {
		return nil, err
	}
	if bytes, handles, err := encoder.Data(); err != nil {
		return nil, err
	} else {
		target := transcoder.ToMojomTarget()
		if err := util.JoinRawBytesAsStruct(target, t, inargs); err != nil {
			return nil, err
		}
		moreBytes := target.Bytes()
		// Append the encoded "payload" to the end of the slice.
		bytes = append(bytes, moreBytes...)

		return &bindings.Message{
			Header:  header,
			Bytes:   bytes,
			Handles: handles,
			Payload: moreBytes,
		}, nil
	}
}
Ejemplo n.º 2
0
func (s *messageReceiver) Accept(message *bindings.Message) (err error) {
	if _, ok := s.header.ifaceSig.Methods[message.Header.Type]; !ok {
		return fmt.Errorf("Method had index %d, but interface only has %d methods",
			message.Header.Type, len(s.header.ifaceSig.Methods))
	}

	methodSig := s.header.ifaceSig.Methods[message.Header.Type]
	methodName := *methodSig.DeclData.ShortName
	// Should we perform validation of flags like generated methods?
	// Does this handle 0-arg methods?

	messageBytes := message.Payload

	if methodSig.ResponseParams == nil {
		// This may be complicated to support because of a race on the server side.
		// When we send the no-response message through mojo we don't know when it has been received
		// and we can close the pipe (one is opened per incoming message).

		// Note that because the client expects no response, it will not receive the following
		// error.
		return fmt.Errorf("this error not received")
	}

	response, err := s.call(s.header.v23Name, methodName, messageBytes, methodSig.Parameters, methodSig.ResponseParams)
	if err != nil {
		return err
	}

	// TODO(alexfandrianto): This assumes that bindings.Encoder has the method
	// WriteRawBytes. We will need to add this to Mojo ourselves.
	// func (e *Encoder) WriteRawBytes(data []byte) {
	// 	first := e.end
	// 	e.claimData(align(len(data), defaultAlignment))
	// 	copy(e.buf[first:], data)
	// }
	//
	// See: https://codereview.chromium.org/1416433002/

	responseHeader := bindings.MessageHeader{
		Type:      message.Header.Type,
		Flags:     bindings.MessageIsResponseFlag,
		RequestId: message.Header.RequestId,
	}
	// responseMessage, err := bindings.EncodeMessage(responseHeader, byteCopyingPayload(response))
	// if err != nil {
	// 	return err
	// }
	// return s.connector.WriteMessage(responseMessage)

	// TODO(alexfandrianto): Replace this block with the above.
	encoder := bindings.NewEncoder()
	if err := responseHeader.Encode(encoder); err != nil {
		return err
	}
	if bytes, handles, err := encoder.Data(); err != nil {
		return err
	} else {
		// response is our payload; append to the end of our slice.
		bytes = append(bytes, response...)

		// This is analogous to bindings.newMessage
		responseMessage := &bindings.Message{
			Header:  responseHeader,
			Bytes:   bytes,
			Handles: handles,
			Payload: response,
		}
		return s.connector.WriteMessage(responseMessage)
	}
}