null_client.h

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Copyright (C) 2008 Sun Microsystems, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#pragma once

#include <drizzled/plugin/client.h>
#include <boost/tokenizer.hpp>
#include <vector>
#include <queue>
#include <string>

namespace drizzled {
namespace plugin {

class NullClient: public Client
{
  typedef std::vector<char> Bytes;
  typedef std::queue<Bytes> Queue;
  Queue to_execute;
  bool is_dead;
  Bytes packet_buffer;

public:

  NullClient() :
    is_dead(false)
  {
  }

  virtual int getFileDescriptor(void) { return -1; }
  virtual bool isConnected(void) { return true; }
  virtual bool flush(void) { return false; }
  virtual void close(void) {}
  virtual bool authenticate(void) { return true; }

  virtual bool readCommand(char **packet, uint32_t& packet_length)
  {
    while (not to_execute.empty())
    {
      Queue::value_type next= to_execute.front();
      packet_buffer.assign(next.begin(), next.end());
      *packet= &packet_buffer[0];
      packet_length= next.size();
      to_execute.pop();
      return true;
    }

    if (not is_dead)
    {
      packet_buffer.resize(1);
      packet_length= 1;
      *packet= &packet_buffer[0];
      is_dead= true;
      return true;
    }

    packet_length= 0;
    return false;
  }

  virtual void sendOK() {}
  virtual void sendEOF() {}
  virtual void sendError(const drizzled::error_t, const char*) {}
  virtual void sendFields(List<Item>&) {}
  virtual void store(Field *) {}
  virtual void store(void) {}
  virtual void store(int32_t) {}
  virtual void store(uint32_t) {}
  virtual void store(int64_t) {}
  virtual void store(uint64_t) {}
  virtual void store(double, uint32_t, String*) {}
  virtual void store(const type::Time*) {}
  virtual void store(const char*) {}
  virtual void store(const char*, size_t) {}
  virtual void store(str_ref) {}
  virtual bool haveError() { return false; }
  virtual bool wasAborted() { return false; }

  void pushSQL(str_ref arg)
  {
    Bytes byte;
    typedef boost::tokenizer<boost::escaped_list_separator<char> > Tokenizer;
    Tokenizer tok(arg, boost::escaped_list_separator<char>("\\", ";", "\""));

    for (Tokenizer::iterator iter= tok.begin(); iter != tok.end(); ++iter)
    {
      byte.resize(iter->size() +1); // +1 for the COM_QUERY
      byte[0]= COM_QUERY;
      memcpy(&byte[1], iter->data(), iter->size());
      to_execute.push(byte);
    }
  }
};

} /* namespace plugin */
} /* namespace drizzled */