XmlRpcCarrier.h

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/*
 * Copyright (C) 2006-2020 Istituto Italiano di Tecnologia (IIT)
 * All rights reserved.
 *
 * This software may be modified and distributed under the terms of the
 * BSD-3-Clause license. See the accompanying LICENSE file for details.
 */
 
#ifndef YARP_XMLRPC_CARRIER_XMLRPCCARRIER_H
#define YARP_XMLRPC_CARRIER_XMLRPCCARRIER_H
 
#include <yarp/os/Carrier.h>
#include <yarp/os/ConnectionState.h>
#include "XmlRpcStream.h"
 
class XmlRpcCarrier :
        public yarp::os::Carrier
{
private:
    bool firstRound;
    bool sender;
    yarp::os::Contact host;
    std::string http;
    bool interpretRos;
public:
    XmlRpcCarrier() :
            firstRound(true),
            sender(false),
            interpretRos(false)
    {
    }
 
    Carrier *create() const override
    {
        return new XmlRpcCarrier();
    }
 
    std::string getName() const override
    {
        return "xmlrpc";
    }
 
    bool isConnectionless() const override
    {
        return false;
    }
 
    bool canAccept() const override
    {
        return true;
    }
 
    bool canOffer() const override
    {
        return true;
    }
 
    bool isTextMode() const override
    {
        return true;
    }
 
    bool canEscape() const override
    {
        return true;
    }
 
    bool requireAck() const override
    {
        return false;
    }
 
    bool supportReply() const override
    {
        return true;
    }
 
    bool isLocal() const override
    {
        return false;
    }
 
    std::string toString() const override
    {
        return "xmlrpc_carrier";
    }
 
    void getHeader(yarp::os::Bytes& header) const override
    {
        const char *target = "POST /RP";
        for (size_t i=0; i<8 && i<header.length(); i++) {
            header.get()[i] = target[i];
        }
    }
 
    bool checkHeader(const yarp::os::Bytes& header) override
    {
        if (header.length()!=8) {
            return false;
        }
        const char *target = "POST /";
        for (int i=0; i<6; i++) {
            if (header.get()[i] != target[i]) {
                return false;
            }
        }
        return true;
    }
 
    void setParameters(const yarp::os::Bytes& header) override
    {
        // no parameters - no carrier variants
    }
 
 
    // Now, the initial hand-shaking
 
    bool prepareSend(yarp::os::ConnectionState& proto) override
    {
        // nothing special to do
        return true;
    }
 
    bool sendHeader(yarp::os::ConnectionState& proto) override;
 
    bool expectSenderSpecifier(yarp::os::ConnectionState& proto) override;
 
    bool expectExtraHeader(yarp::os::ConnectionState& proto) override
    {
        // interpret any extra header information sent - optional
        return true;
    }
 
    bool respondToHeader(yarp::os::ConnectionState& proto) override;
 
    bool expectReplyToHeader(yarp::os::ConnectionState& proto) override
    {
        sender = true;
        XmlRpcStream *stream = new XmlRpcStream(proto.giveStreams(),sender,
                                                interpretRos);
        if (stream == nullptr) {
            return false;
        }
        proto.takeStreams(stream);
        return true;
    }
 
    bool isActive() const override
    {
        return true;
    }
 
 
    // Payload time!
 
    bool write(yarp::os::ConnectionState& proto, yarp::os::SizedWriter& writer) override;
 
    bool reply(yarp::os::ConnectionState& proto, yarp::os::SizedWriter& writer) override;
 
    virtual bool sendIndex(yarp::os::ConnectionState& proto, yarp::os::SizedWriter& writer)
    {
        return true;
    }
 
    bool expectIndex(yarp::os::ConnectionState& proto) override
    {
        return true;
    }
 
    bool sendAck(yarp::os::ConnectionState& proto) override
    {
        return true;
    }
 
    bool expectAck(yarp::os::ConnectionState& proto) override
    {
        return true;
    }
 
    std::string getBootstrapCarrierName() const override
    {
        return {};
    }
 
private:
    bool shouldInterpretRosMessages(yarp::os::ConnectionState& proto);
};
 
#endif // YARP_XMLRPC_CARRIER_XMLRPCCARRIER_H