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83 lines (67 loc) · 3.04 KB
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/*
This file is part of libhttpserver
Copyright (C) 2011-2019 Sebastiano Merlino
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.h> or <httpserverpp> can be included directly."
#endif
#ifndef SRC_HTTPSERVER_DEFERRED_RESPONSE_HPP_
#define SRC_HTTPSERVER_DEFERRED_RESPONSE_HPP_
#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include "httpserver/http_utils.h"
#include "httpserver/string_response.h"
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(reinterpret_cast<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);
}
};
} // namespace httpserver
#endif // SRC_HTTPSERVER_DEFERRED_RESPONSE_HPP_