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110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#pragma once
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#include <curl/curl.h>
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#include <chrono>
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#include <stdexcept>
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#include <utility>
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/**
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* An OO wrapper for a "CURLM*" (a libCURL "multi" handle).
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*/
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class CurlMulti {
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CURLM *handle = nullptr;
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public:
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/**
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* Allocate a new CURLM*.
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*
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* Throws on error.
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*/
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CurlMulti()
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:handle(curl_multi_init())
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{
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if (handle == nullptr)
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throw std::runtime_error("curl_multi_init() failed");
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}
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/**
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* Create an empty instance.
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*/
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CurlMulti(std::nullptr_t) noexcept:handle(nullptr) {}
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CurlMulti(CurlMulti &&src) noexcept
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:handle(std::exchange(src.handle, nullptr)) {}
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~CurlMulti() noexcept {
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if (handle != nullptr)
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curl_multi_cleanup(handle);
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}
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CurlMulti &operator=(CurlMulti &&src) noexcept {
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std::swap(handle, src.handle);
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return *this;
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}
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operator bool() const noexcept {
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return handle != nullptr;
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}
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CURLM *Get() noexcept {
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return handle;
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}
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template<typename T>
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void SetOption(CURLMoption option, T value) {
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auto code = curl_multi_setopt(handle, option, value);
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if (code != CURLM_OK)
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throw std::runtime_error(curl_multi_strerror(code));
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}
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void SetSocketFunction(int (*function)(CURL *easy, curl_socket_t s, int what, void *clientp, void *socketp) noexcept,
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void *clientp) {
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SetOption(CURLMOPT_SOCKETFUNCTION, function);
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SetOption(CURLMOPT_SOCKETDATA, clientp);
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}
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void SetTimerFunction(int (*function)(CURLM *multi, long timeout_ms, void *clientp) noexcept,
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void *clientp) {
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SetOption(CURLMOPT_TIMERFUNCTION, function);
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SetOption(CURLMOPT_TIMERDATA, clientp);
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}
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void Add(CURL *easy) {
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auto code = curl_multi_add_handle(handle, easy);
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if (code != CURLM_OK)
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throw std::runtime_error(curl_multi_strerror(code));
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}
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void Remove(CURL *easy) {
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auto code = curl_multi_remove_handle(handle, easy);
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if (code != CURLM_OK)
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throw std::runtime_error(curl_multi_strerror(code));
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}
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CURLMsg *InfoRead() noexcept {
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int msgs_in_queue;
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return curl_multi_info_read(handle, &msgs_in_queue);
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}
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unsigned Perform() {
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int running_handles;
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auto code = curl_multi_perform(handle, &running_handles);
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if (code != CURLM_OK)
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throw std::runtime_error(curl_multi_strerror(code));
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return running_handles;
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}
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unsigned Wait(std::chrono::duration<int, std::chrono::milliseconds::period> timeout) {
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int numfds;
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auto code = curl_multi_wait(handle, nullptr, 0, timeout.count(),
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&numfds);
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if (code != CURLM_OK)
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throw std::runtime_error(curl_multi_strerror(code));
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return numfds;
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}
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};
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