497 lines
15 KiB
C++
497 lines
15 KiB
C++
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2012 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* <DESC>
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* demonstrate the use of multi socket interface with boost::asio
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* </DESC>
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*/
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/*
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* This program is in c++ and uses boost::asio instead of libevent/libev.
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* Requires boost::asio, boost::bind and boost::system
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*
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* This is an adaptation of libcurl's "hiperfifo.c" and "evhiperfifo.c"
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* sample programs. This example implements a subset of the functionality from
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* hiperfifo.c, for full functionality refer hiperfifo.c or evhiperfifo.c
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*
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* Written by Lijo Antony based on hiperfifo.c by Jeff Pohlmeyer
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*
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* When running, the program creates an easy handle for a URL and
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* uses the curl_multi API to fetch it.
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*
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* Note:
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* For the sake of simplicity, URL is hard coded to "www.google.com"
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*
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* This is purely a demo app, all retrieved data is simply discarded by the
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* write callback.
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*
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* ===========================================================================
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* WARNING: This example program is known to have flaws:
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* https://github.com/curl/curl/issues/2407
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*
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* It still kept in the example repository with the hope that it might be
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* useful, and maybe some day someone who knows enough about boost::asio will
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* read this text, accept the challenge and make the example code work
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* correctly. Until then: expect this example program to fail occasionally.
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* ===========================================================================
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*/
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#include <curl/curl.h>
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#include <boost/asio.hpp>
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#include <boost/bind.hpp>
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#include <iostream>
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#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
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/* boost::asio related objects
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* using global variables for simplicity
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*/
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boost::asio::io_service io_service;
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boost::asio::deadline_timer timer(io_service);
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std::map<curl_socket_t, boost::asio::ip::tcp::socket *> socket_map;
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/* Global information, common to all connections */
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typedef struct _GlobalInfo
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{
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CURLM *multi;
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int still_running;
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} GlobalInfo;
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/* Information associated with a specific easy handle */
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typedef struct _ConnInfo
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{
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CURL *easy;
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char *url;
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GlobalInfo *global;
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char error[CURL_ERROR_SIZE];
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} ConnInfo;
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static void timer_cb(const boost::system::error_code & error, GlobalInfo *g);
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/* Update the event timer after curl_multi library calls */
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static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
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{
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fprintf(MSG_OUT, "\nmulti_timer_cb: timeout_ms %ld", timeout_ms);
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/* cancel running timer */
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timer.cancel();
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if(timeout_ms > 0) {
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/* update timer */
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timer.expires_from_now(boost::posix_time::millisec(timeout_ms));
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timer.async_wait(boost::bind(&timer_cb, _1, g));
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}
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else if(timeout_ms == 0) {
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/* call timeout function immediately */
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boost::system::error_code error; /*success*/
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timer_cb(error, g);
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}
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return 0;
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}
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/* Die if we get a bad CURLMcode somewhere */
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static void mcode_or_die(const char *where, CURLMcode code)
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{
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if(CURLM_OK != code) {
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const char *s;
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switch(code) {
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case CURLM_CALL_MULTI_PERFORM:
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s = "CURLM_CALL_MULTI_PERFORM";
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break;
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case CURLM_BAD_HANDLE:
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s = "CURLM_BAD_HANDLE";
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break;
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case CURLM_BAD_EASY_HANDLE:
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s = "CURLM_BAD_EASY_HANDLE";
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break;
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case CURLM_OUT_OF_MEMORY:
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s = "CURLM_OUT_OF_MEMORY";
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break;
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case CURLM_INTERNAL_ERROR:
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s = "CURLM_INTERNAL_ERROR";
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break;
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case CURLM_UNKNOWN_OPTION:
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s = "CURLM_UNKNOWN_OPTION";
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break;
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case CURLM_LAST:
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s = "CURLM_LAST";
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break;
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default:
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s = "CURLM_unknown";
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break;
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case CURLM_BAD_SOCKET:
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s = "CURLM_BAD_SOCKET";
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fprintf(MSG_OUT, "\nERROR: %s returns %s", where, s);
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/* ignore this error */
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return;
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}
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fprintf(MSG_OUT, "\nERROR: %s returns %s", where, s);
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exit(code);
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}
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}
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/* Check for completed transfers, and remove their easy handles */
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static void check_multi_info(GlobalInfo *g)
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{
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char *eff_url;
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CURLMsg *msg;
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int msgs_left;
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ConnInfo *conn;
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CURL *easy;
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CURLcode res;
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fprintf(MSG_OUT, "\nREMAINING: %d", g->still_running);
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while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
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if(msg->msg == CURLMSG_DONE) {
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easy = msg->easy_handle;
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res = msg->data.result;
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curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
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curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
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fprintf(MSG_OUT, "\nDONE: %s => (%d) %s", eff_url, res, conn->error);
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curl_multi_remove_handle(g->multi, easy);
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free(conn->url);
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curl_easy_cleanup(easy);
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free(conn);
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}
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}
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}
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/* Called by asio when there is an action on a socket */
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static void event_cb(GlobalInfo *g, curl_socket_t s,
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int action, const boost::system::error_code & error,
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int *fdp)
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{
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fprintf(MSG_OUT, "\nevent_cb: action=%d", action);
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if(socket_map.find(s) == socket_map.end()) {
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fprintf(MSG_OUT, "\nevent_cb: socket already closed");
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return;
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}
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/* make sure the event matches what are wanted */
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if(*fdp == action || *fdp == CURL_POLL_INOUT) {
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CURLMcode rc;
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if(error)
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action = CURL_CSELECT_ERR;
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rc = curl_multi_socket_action(g->multi, s, action, &g->still_running);
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mcode_or_die("event_cb: curl_multi_socket_action", rc);
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check_multi_info(g);
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if(g->still_running <= 0) {
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fprintf(MSG_OUT, "\nlast transfer done, kill timeout");
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timer.cancel();
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}
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/* keep on watching.
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* the socket may have been closed and/or fdp may have been changed
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* in curl_multi_socket_action(), so check them both */
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if(!error && socket_map.find(s) != socket_map.end() &&
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(*fdp == action || *fdp == CURL_POLL_INOUT)) {
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boost::asio::ip::tcp::socket *tcp_socket = socket_map.find(s)->second;
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if(action == CURL_POLL_IN) {
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tcp_socket->async_read_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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action, _1, fdp));
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}
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if(action == CURL_POLL_OUT) {
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tcp_socket->async_write_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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action, _1, fdp));
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}
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}
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}
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}
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/* Called by asio when our timeout expires */
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static void timer_cb(const boost::system::error_code & error, GlobalInfo *g)
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{
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if(!error) {
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fprintf(MSG_OUT, "\ntimer_cb: ");
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CURLMcode rc;
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rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0,
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&g->still_running);
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mcode_or_die("timer_cb: curl_multi_socket_action", rc);
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check_multi_info(g);
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}
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}
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/* Clean up any data */
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static void remsock(int *f, GlobalInfo *g)
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{
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fprintf(MSG_OUT, "\nremsock: ");
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if(f) {
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free(f);
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}
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}
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static void setsock(int *fdp, curl_socket_t s, CURL *e, int act, int oldact,
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GlobalInfo *g)
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{
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fprintf(MSG_OUT, "\nsetsock: socket=%d, act=%d, fdp=%p", s, act, fdp);
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std::map<curl_socket_t, boost::asio::ip::tcp::socket *>::iterator it =
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socket_map.find(s);
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if(it == socket_map.end()) {
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fprintf(MSG_OUT, "\nsocket %d is a c-ares socket, ignoring", s);
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return;
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}
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boost::asio::ip::tcp::socket * tcp_socket = it->second;
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*fdp = act;
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if(act == CURL_POLL_IN) {
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fprintf(MSG_OUT, "\nwatching for socket to become readable");
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if(oldact != CURL_POLL_IN && oldact != CURL_POLL_INOUT) {
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tcp_socket->async_read_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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CURL_POLL_IN, _1, fdp));
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}
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}
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else if(act == CURL_POLL_OUT) {
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fprintf(MSG_OUT, "\nwatching for socket to become writable");
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if(oldact != CURL_POLL_OUT && oldact != CURL_POLL_INOUT) {
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tcp_socket->async_write_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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CURL_POLL_OUT, _1, fdp));
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}
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}
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else if(act == CURL_POLL_INOUT) {
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fprintf(MSG_OUT, "\nwatching for socket to become readable & writable");
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if(oldact != CURL_POLL_IN && oldact != CURL_POLL_INOUT) {
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tcp_socket->async_read_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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CURL_POLL_IN, _1, fdp));
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}
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if(oldact != CURL_POLL_OUT && oldact != CURL_POLL_INOUT) {
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tcp_socket->async_write_some(boost::asio::null_buffers(),
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boost::bind(&event_cb, g, s,
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CURL_POLL_OUT, _1, fdp));
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}
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}
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}
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static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
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{
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/* fdp is used to store current action */
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int *fdp = (int *) calloc(sizeof(int), 1);
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setsock(fdp, s, easy, action, 0, g);
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curl_multi_assign(g->multi, s, fdp);
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}
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/* CURLMOPT_SOCKETFUNCTION */
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static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
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{
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fprintf(MSG_OUT, "\nsock_cb: socket=%d, what=%d, sockp=%p", s, what, sockp);
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GlobalInfo *g = (GlobalInfo*) cbp;
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int *actionp = (int *) sockp;
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const char *whatstr[] = { "none", "IN", "OUT", "INOUT", "REMOVE"};
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fprintf(MSG_OUT,
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"\nsocket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
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if(what == CURL_POLL_REMOVE) {
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fprintf(MSG_OUT, "\n");
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remsock(actionp, g);
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}
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else {
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if(!actionp) {
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fprintf(MSG_OUT, "\nAdding data: %s", whatstr[what]);
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addsock(s, e, what, g);
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}
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else {
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fprintf(MSG_OUT,
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"\nChanging action from %s to %s",
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whatstr[*actionp], whatstr[what]);
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setsock(actionp, s, e, what, *actionp, g);
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}
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}
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return 0;
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}
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/* CURLOPT_WRITEFUNCTION */
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static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
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{
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size_t written = size * nmemb;
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char *pBuffer = (char *)malloc(written + 1);
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strncpy(pBuffer, (const char *)ptr, written);
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pBuffer[written] = '\0';
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fprintf(MSG_OUT, "%s", pBuffer);
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free(pBuffer);
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return written;
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}
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/* CURLOPT_PROGRESSFUNCTION */
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static int prog_cb(void *p, double dltotal, double dlnow, double ult,
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double uln)
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{
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ConnInfo *conn = (ConnInfo *)p;
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(void)ult;
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||
|
|
(void)uln;
|
||
|
|
|
||
|
|
fprintf(MSG_OUT, "\nProgress: %s (%g/%g)", conn->url, dlnow, dltotal);
|
||
|
|
fprintf(MSG_OUT, "\nProgress: %s (%g)", conn->url, ult);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* CURLOPT_OPENSOCKETFUNCTION */
|
||
|
|
static curl_socket_t opensocket(void *clientp, curlsocktype purpose,
|
||
|
|
struct curl_sockaddr *address)
|
||
|
|
{
|
||
|
|
fprintf(MSG_OUT, "\nopensocket :");
|
||
|
|
|
||
|
|
curl_socket_t sockfd = CURL_SOCKET_BAD;
|
||
|
|
|
||
|
|
/* restrict to IPv4 */
|
||
|
|
if(purpose == CURLSOCKTYPE_IPCXN && address->family == AF_INET) {
|
||
|
|
/* create a tcp socket object */
|
||
|
|
boost::asio::ip::tcp::socket *tcp_socket =
|
||
|
|
new boost::asio::ip::tcp::socket(io_service);
|
||
|
|
|
||
|
|
/* open it and get the native handle*/
|
||
|
|
boost::system::error_code ec;
|
||
|
|
tcp_socket->open(boost::asio::ip::tcp::v4(), ec);
|
||
|
|
|
||
|
|
if(ec) {
|
||
|
|
/* An error occurred */
|
||
|
|
std::cout << std::endl << "Couldn't open socket [" << ec << "][" <<
|
||
|
|
ec.message() << "]";
|
||
|
|
fprintf(MSG_OUT, "\nERROR: Returning CURL_SOCKET_BAD to signal error");
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
sockfd = tcp_socket->native_handle();
|
||
|
|
fprintf(MSG_OUT, "\nOpened socket %d", sockfd);
|
||
|
|
|
||
|
|
/* save it for monitoring */
|
||
|
|
socket_map.insert(std::pair<curl_socket_t,
|
||
|
|
boost::asio::ip::tcp::socket *>(sockfd, tcp_socket));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return sockfd;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* CURLOPT_CLOSESOCKETFUNCTION */
|
||
|
|
static int close_socket(void *clientp, curl_socket_t item)
|
||
|
|
{
|
||
|
|
fprintf(MSG_OUT, "\nclose_socket : %d", item);
|
||
|
|
|
||
|
|
std::map<curl_socket_t, boost::asio::ip::tcp::socket *>::iterator it =
|
||
|
|
socket_map.find(item);
|
||
|
|
|
||
|
|
if(it != socket_map.end()) {
|
||
|
|
delete it->second;
|
||
|
|
socket_map.erase(it);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Create a new easy handle, and add it to the global curl_multi */
|
||
|
|
static void new_conn(char *url, GlobalInfo *g)
|
||
|
|
{
|
||
|
|
ConnInfo *conn;
|
||
|
|
CURLMcode rc;
|
||
|
|
|
||
|
|
conn = (ConnInfo *) calloc(1, sizeof(ConnInfo));
|
||
|
|
|
||
|
|
conn->easy = curl_easy_init();
|
||
|
|
if(!conn->easy) {
|
||
|
|
fprintf(MSG_OUT, "\ncurl_easy_init() failed, exiting!");
|
||
|
|
exit(2);
|
||
|
|
}
|
||
|
|
|
||
|
|
conn->global = g;
|
||
|
|
conn->url = strdup(url);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, &conn);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 1L);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
|
||
|
|
|
||
|
|
/* call this function to get a socket */
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_OPENSOCKETFUNCTION, opensocket);
|
||
|
|
|
||
|
|
/* call this function to close a socket */
|
||
|
|
curl_easy_setopt(conn->easy, CURLOPT_CLOSESOCKETFUNCTION, close_socket);
|
||
|
|
|
||
|
|
fprintf(MSG_OUT,
|
||
|
|
"\nAdding easy %p to multi %p (%s)", conn->easy, g->multi, url);
|
||
|
|
rc = curl_multi_add_handle(g->multi, conn->easy);
|
||
|
|
mcode_or_die("new_conn: curl_multi_add_handle", rc);
|
||
|
|
|
||
|
|
/* note that the add_handle() will set a time-out to trigger very soon so
|
||
|
|
that the necessary socket_action() call will be called by this app */
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
GlobalInfo g;
|
||
|
|
|
||
|
|
(void)argc;
|
||
|
|
(void)argv;
|
||
|
|
|
||
|
|
memset(&g, 0, sizeof(GlobalInfo));
|
||
|
|
g.multi = curl_multi_init();
|
||
|
|
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
|
||
|
|
|
||
|
|
new_conn((char *)"www.google.com", &g); /* add a URL */
|
||
|
|
|
||
|
|
/* enter io_service run loop */
|
||
|
|
io_service.run();
|
||
|
|
|
||
|
|
curl_multi_cleanup(g.multi);
|
||
|
|
|
||
|
|
fprintf(MSG_OUT, "\ndone.\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|