libhttpserver/src/httpserver/deferred_response.hpp at master · repo-forker/libhttpserver · GitHub

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This file is part of libhttpserver

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

#if !defined (_HTTPSERVER_HPP_INSIDE_) && !defined (HTTPSERVER_COMPILATION)

#error "Only <httpserver.hpp> or <httpserverpp> can be included directly."

#endif

#ifndef _DEFERRED_RESPONSE_HPP_

#define _DEFERRED_RESPONSE_HPP_

#include <stddef.h>

#include <stdint.h>

#include <sys/types.h>

#include <memory>

#include <string>

#include "http_utils.hpp"

#include "httpserver/string_response.hpp"

struct MHD_Response;

namespace httpserver

{

namespace details

{

MHD_Response* get_raw_response_helper(void* cls, ssize_t (*cb)(void*, uint64_t, char*, size_t));

}

template <class T>

class deferred_response : public string_response

{

public:

explicit deferred_response(

ssize_t(*cycle_callback)(std::shared_ptr<T>, char*, size_t),

std::shared_ptr<T> closure_data,

const std::string& content = "",

int response_code = http::http_utils::http_ok,

const std::string& content_type = http::http_utils::text_plain

string_response(content, response_code, content_type),

cycle_callback(cycle_callback),

closure_data(closure_data)

{

}

deferred_response(const deferred_response& other) = default;

deferred_response(deferred_response&& other) noexcept = default;

deferred_response& operator=(const deferred_response& b) = default;

deferred_response& operator=(deferred_response&& b) = default;

~deferred_response() = default;

MHD_Response* get_raw_response()

{

return details::get_raw_response_helper((void*) this, &cb);

}

private:

ssize_t (*cycle_callback)(std::shared_ptr<T>, char*, size_t);

std::shared_ptr<T> closure_data;

static ssize_t cb(void* cls, uint64_t, char* buf, size_t max)

{

deferred_response<T>* dfr = static_cast<deferred_response<T>*>(cls);

return dfr->cycle_callback(dfr->closure_data, buf, max);

}

};

}

#endif // _DEFERRED_RESPONSE_HPP_

libhttpserver/src/httpserver/deferred_response.hpp at master · repo-forker/libhttpserver · GitHub

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