HTTPResponse.h

// -*- mode: c++; c-basic-offset:4 -*-

// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.

// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// 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.
//
// 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
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

#ifndef http_response_h
#define http_response_h

#include <unistd.h>

#include <cstdio>

#include <string>
#include <iostream>
#include <algorithm>
#include <iterator>
#include <vector>

#include "Response.h"
#include "util.h"
#include "debug.h"

namespace libdap
{

// defined in HTTPConnect.cc
extern int dods_keep_temps;
extern void close_temp(FILE *s, const string &name);

class HTTPResponse : public Response
{
private:
    std::vector<std::string> *d_headers; // Response headers
    std::string d_file;  // Temp file that holds response body

protected:
    HTTPResponse();
    HTTPResponse(const HTTPResponse &rs);
    HTTPResponse &operator=(const HTTPResponse &);

public:
    HTTPResponse(FILE *s, int status, std::vector<std::string> *h, const std::string &temp_file)
            : Response(s, status), d_headers(h), d_file(temp_file)
    {
        DBG(cerr << "Headers: " << endl);
        DBGN(copy(d_headers->begin(), d_headers->end(),
                  ostream_iterator<string>(cerr, "\n")));
        DBGN(cerr << "end of headers." << endl);
    }

    HTTPResponse(std::fstream *s, int status, std::vector<std::string> *h, const std::string &temp_file)
            : Response(s, status), d_headers(h), d_file(temp_file)
    {
        DBG(cerr << "Headers: " << endl);
        DBGN(copy(d_headers->begin(), d_headers->end(),
                  ostream_iterator<string>(cerr, "\n")));
        DBGN(cerr << "end of headers." << endl);
    }

    virtual ~HTTPResponse()
    {
        DBG(cerr << "Freeing HTTPConnect resources (" + d_file + ")... ");

        // This can always be done - if the cpp_stream is null, delete has no effect;
        // if non-null in this class it was allocated in HTTPConnect::plain_fetch_url
        // (or caching_fetch_url when that's implemented)
        delete get_cpp_stream();
        set_cpp_stream(0);

        if (!dods_keep_temps && !d_file.empty()) {
            if (get_stream()) {
                close_temp(get_stream(), d_file);
                set_stream(0);
            }
            else {
                (void) unlink(d_file.c_str());
#if 0
                long res = unlink(d_file.c_str());
                if (res != 0) throw InternalErr(__FILE__, __LINE__, "!FAIL! " + long_to_string(res));
#endif
            }
        }

        delete d_headers;

        DBGN(cerr << endl);
    }

    void transform_to_cpp() {
        // ~Response() will take care of closing the FILE*. A better version of this
        // code would not leave the FILE* open when it's not needed, but this implementation
        // can use the existing HTTPConnect and HTTPCache software with very minimal
        // (or no) modification. jhrg 11/8/13
        set_cpp_stream(new std::fstream(d_file.c_str(), std::ios::in|std::ios::binary));
    }

    virtual std::vector<std::string> *get_headers() const { return d_headers; }
    virtual std::string get_file() const { return d_file; }

    virtual void set_headers(std::vector<std::string> *h) { d_headers = h; }
    virtual void set_file(const std::string &n) { d_file = n; }
};

} // namespace libdap

#endif // http_response_h