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/*
* Copyright (C) 2008-2017 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CURL_REQUEST_HXX
#define CURL_REQUEST_HXX
#include "Easy.hxx"
#include "event/DeferEvent.hxx"
#include <map>
#include <string>
#include <exception>
struct StringView;
class CurlGlobal;
class CurlResponseHandler;
class CurlRequest final {
CurlGlobal &global;
CurlResponseHandler &handler;
/** the curl handle */
CurlEasy easy;
enum class State {
HEADERS,
BODY,
CLOSED,
} state = State::HEADERS;
std::multimap<std::string, std::string> headers;
/**
* An exception caught by DataReceived(), which will be
* forwarded into a "safe" stack frame by
* #postpone_error_event. This works around the
* problem that libcurl crashes if you call
* curl_multi_remove_handle() from within the WRITEFUNCTION
* (i.e. DataReceived()).
*/
std::exception_ptr postponed_error;
DeferEvent postpone_error_event;
/** error message provided by libcurl */
char error_buffer[CURL_ERROR_SIZE];
bool registered = false;
public:
/**
* To start sending the request, call Start().
*/
CurlRequest(CurlGlobal &_global,
CurlResponseHandler &_handler);
CurlRequest(CurlGlobal &_global, const char *url,
CurlResponseHandler &_handler)
:CurlRequest(_global, _handler) {
SetUrl(url);
}
~CurlRequest() noexcept;
CurlRequest(const CurlRequest &) = delete;
CurlRequest &operator=(const CurlRequest &) = delete;
/**
* Register this request via CurlGlobal::Add(), which starts
* the request.
*
* This method must be called in the event loop thread.
*/
void Start();
/**
* A thread-safe version of Start().
*/
void StartIndirect();
/**
* Unregister this request via CurlGlobal::Remove().
*
* This method must be called in the event loop thread.
*/
void Stop() noexcept;
/**
* A thread-safe version of Stop().
*/
void StopIndirect();
CURL *Get() noexcept {
return easy.Get();
}
template<typename T>
void SetOption(CURLoption option, T value) {
easy.SetOption(option, value);
}
void SetUrl(const char *url) {
easy.SetOption(CURLOPT_URL, url);
}
/**
* CurlResponseHandler::OnData() shall throw this to pause the
* stream. Call Resume() to resume the transfer.
*/
struct Pause {};
void Resume() noexcept;
/**
* A HTTP request is finished. Called by #CurlGlobal.
*/
void Done(CURLcode result) noexcept;
private:
/**
* Frees the current "libcurl easy" handle, and everything
* associated with it.
*/
void FreeEasy() noexcept;
void FinishHeaders();
void FinishBody();
size_t DataReceived(const void *ptr, size_t size) noexcept;
void HeaderFunction(StringView s) noexcept;
void OnPostponeError() noexcept;
/** called by curl when new data is available */
static size_t _HeaderFunction(void *ptr, size_t size, size_t nmemb,
void *stream) noexcept;
/** called by curl when new data is available */
static size_t WriteFunction(void *ptr, size_t size, size_t nmemb,
void *stream) noexcept;
};
#endif