Responder.h

/* Copyright (C) 2020 Marc Boris Duerner
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  As a special exception, you may use this file as part of a free
  software library without restriction. Specifically, if other files
  instantiate templates or use macros or inline functions from this
  file, or you compile this file and link it with other files to
  produce an executable, this file does not by itself cause the
  resulting executable to be covered by the GNU General Public
  License. This exception does not however invalidate any other
  reasons why the executable file might be covered by the GNU Library
  General Public License.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
  MA 02110-1301 USA
*/
 
#ifndef Pt_JsonRpc_Responder_h
#define Pt_JsonRpc_Responder_h
 
#include <Pt/JsonRpc/Api.h>
#include <Pt/JsonRpc/Fault.h>
//#include <Pt/XmlRpc/Formatter.h>
#include <Pt/Remoting/Responder.h>
//#include <Pt/Xml/InputSource.h>
#include <Pt/Json/JsonReader.h>
#include <Pt/Json/JsonWriter.h>
#include <Pt/Json/JsonFormatter.h>
#include <Pt/TextStream.h>
#include <Pt/NonCopyable.h>
#include <Pt/Utf8Codec.h>
#include <Pt/Types.h>
 
namespace Pt {
 
namespace JsonRpc {
 
class PT_JSONRPC_API Responder : public Remoting::Responder
{
    public:
        Responder(Remoting::ServiceDefinition& service);
 
        virtual ~Responder();
 
        bool isFailed() const;
 
    protected:
        // inheritdoc
        virtual void onReady();
 
        // inheritdoc
        virtual void onCancel();
 
        virtual void onFault(const Fault& fault) = 0;
 
        virtual void onResult() = 0;
 
    protected:
        void beginMessage(std::istream& is);
 
        bool parseMessage();
 
        void finishMessage(System::EventLoop& loop);
 
        void beginResult(std::ostream& os);
 
        void beginFault(std::ostream& os, const Fault& fault);
 
        bool advanceResult();
 
        void finishResult();
 
        void setFault(int rc, const char* msg);
 
    private:
        bool advance(const Pt::Json::Node& node);
 
    private:
        enum State
        {
            OnBegin,
            OnMethodCallBegin,
            OnMethodNameBegin,
            OnMethodName,
            OnMethodNameEnd,
            OnParams,
            OnParam,
            OnParamsEnd,
            OnMethodCallEnd
        };
 
        Utf8Codec        _utf8;
        TextIStream      _tis;
        Json::JsonReader _reader;
        Composer**       _args;
        State            _state;
        long long        _id;
 
        TextOStream         _tos;
        Json::JsonWriter    _writer;
        Json::JsonFormatter _formatter;
        Decomposer*         _result;
 
        Fault _fault;
        bool _isFault;
        Pt::varint_t _r1;
        Pt::varint_t _r2;
};
 
} // namespace XmlRpc
 
} // namespace Pt
 
#endif // Pt_XmlRpc_Responder_h