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-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at http://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-
-/*
- * file: asiohiper.cpp
- * Example program to demonstrate the use of multi socket interface
- * with boost::asio
- *
- * This program is in c++ and uses boost::asio instead of libevent/libev.
- * Requires boost::asio, boost::bind and boost::system
- *
- * This is an adaptation of libcurl's "hiperfifo.c" and "evhiperfifo.c"
- * sample programs. This example implements a subset of the functionality from
- * hiperfifo.c, for full functionality refer hiperfifo.c or evhiperfifo.c
- *
- * Written by Lijo Antony based on hiperfifo.c by Jeff Pohlmeyer
- *
- * When running, the program creates an easy handle for a URL and
- * uses the curl_multi API to fetch it.
- *
- * Note:
- * For the sake of simplicity, URL is hard coded to "www.google.com"
- *
- * This is purely a demo app, all retrieved data is simply discarded by the write
- * callback.
- */
-
-
-#include <curl/curl.h>
-#include <boost/asio.hpp>
-#include <boost/bind.hpp>
-
-#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
-
-/* boost::asio related objects
- * using global variables for simplicity
- */
-boost::asio::io_service io_service;
-boost::asio::deadline_timer timer(io_service);
-std::map<curl_socket_t, boost::asio::ip::tcp::socket *> socket_map;
-
-/* Global information, common to all connections */
-typedef struct _GlobalInfo
-{
- CURLM *multi;
- int still_running;
-} GlobalInfo;
-
-/* Information associated with a specific easy handle */
-typedef struct _ConnInfo
-{
- CURL *easy;
- char *url;
- GlobalInfo *global;
- char error[CURL_ERROR_SIZE];
-} ConnInfo;
-
-static void timer_cb(const boost::system::error_code & error, GlobalInfo *g);
-
-/* Update the event timer after curl_multi library calls */
-static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
-{
- fprintf(MSG_OUT, "\nmulti_timer_cb: timeout_ms %ld", timeout_ms);
-
- /* cancel running timer */
- timer.cancel();
-
- if ( timeout_ms > 0 )
- {
- /* update timer */
- timer.expires_from_now(boost::posix_time::millisec(timeout_ms));
- timer.async_wait(boost::bind(&timer_cb, _1, g));
- }
- else
- {
- /* call timeout function immediately */
- boost::system::error_code error; /*success*/
- timer_cb(error, g);
- }
-
- return 0;
-}
-
-/* Die if we get a bad CURLMcode somewhere */
-static void mcode_or_die(const char *where, CURLMcode code)
-{
- if ( CURLM_OK != code )
- {
- const char *s;
- switch ( code )
- {
- case CURLM_CALL_MULTI_PERFORM: s="CURLM_CALL_MULTI_PERFORM"; break;
- case CURLM_BAD_HANDLE: s="CURLM_BAD_HANDLE"; break;
- case CURLM_BAD_EASY_HANDLE: s="CURLM_BAD_EASY_HANDLE"; break;
- case CURLM_OUT_OF_MEMORY: s="CURLM_OUT_OF_MEMORY"; break;
- case CURLM_INTERNAL_ERROR: s="CURLM_INTERNAL_ERROR"; break;
- case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
- case CURLM_LAST: s="CURLM_LAST"; break;
- default: s="CURLM_unknown";
- break;
- case CURLM_BAD_SOCKET: s="CURLM_BAD_SOCKET";
- fprintf(MSG_OUT, "\nERROR: %s returns %s", where, s);
- /* ignore this error */
- return;
- }
- fprintf(MSG_OUT, "\nERROR: %s returns %s", where, s);
- exit(code);
- }
-}
-
-/* Check for completed transfers, and remove their easy handles */
-static void check_multi_info(GlobalInfo *g)
-{
- char *eff_url;
- CURLMsg *msg;
- int msgs_left;
- ConnInfo *conn;
- CURL *easy;
- CURLcode res;
-
- fprintf(MSG_OUT, "\nREMAINING: %d", g->still_running);
-
- while ((msg = curl_multi_info_read(g->multi, &msgs_left)))
- {
- if (msg->msg == CURLMSG_DONE)
- {
- easy = msg->easy_handle;
- res = msg->data.result;
- curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
- curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
- fprintf(MSG_OUT, "\nDONE: %s => (%d) %s", eff_url, res, conn->error);
- curl_multi_remove_handle(g->multi, easy);
- free(conn->url);
- curl_easy_cleanup(easy);
- free(conn);
- }
- }
-}
-
-/* Called by asio when there is an action on a socket */
-static void event_cb(GlobalInfo * g, boost::asio::ip::tcp::socket * tcp_socket, int action)
-{
- fprintf(MSG_OUT, "\nevent_cb: action=%d", action);
-
- CURLMcode rc;
- rc = curl_multi_socket_action(g->multi, tcp_socket->native_handle(), action, &g->still_running);
-
- mcode_or_die("event_cb: curl_multi_socket_action", rc);
- check_multi_info(g);
-
- if ( g->still_running <= 0 )
- {
- fprintf(MSG_OUT, "\nlast transfer done, kill timeout");
- timer.cancel();
- }
-}
-
-/* Called by asio when our timeout expires */
-static void timer_cb(const boost::system::error_code & error, GlobalInfo *g)
-{
- if ( !error)
- {
- fprintf(MSG_OUT, "\ntimer_cb: ");
-
- CURLMcode rc;
- rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0, &g->still_running);
-
- mcode_or_die("timer_cb: curl_multi_socket_action", rc);
- check_multi_info(g);
- }
-}
-
-/* Clean up any data */
-static void remsock(int *f, GlobalInfo *g)
-{
- fprintf(MSG_OUT, "\nremsock: ");
-
- if ( f )
- {
- free(f);
- }
-}
-
-static void setsock(int *fdp, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
-{
- fprintf(MSG_OUT, "\nsetsock: socket=%d, act=%d, fdp=%p", s, act, fdp);
-
- std::map<curl_socket_t, boost::asio::ip::tcp::socket *>::iterator it = socket_map.find(s);
-
- if ( it == socket_map.end() )
- {
- fprintf(MSG_OUT, "\nsocket %d is a c-ares socket, ignoring", s);
- return;
- }
-
- boost::asio::ip::tcp::socket * tcp_socket = it->second;
-
- *fdp = act;
-
- if ( act == CURL_POLL_IN )
- {
- fprintf(MSG_OUT, "\nwatching for socket to become readable");
-
- tcp_socket->async_read_some(boost::asio::null_buffers(),
- boost::bind(&event_cb, g,
- tcp_socket,
- act));
- }
- else if ( act == CURL_POLL_OUT )
- {
- fprintf(MSG_OUT, "\nwatching for socket to become writable");
-
- tcp_socket->async_write_some(boost::asio::null_buffers(),
- boost::bind(&event_cb, g,
- tcp_socket,
- act));
- }
- else if ( act == CURL_POLL_INOUT )
- {
- fprintf(MSG_OUT, "\nwatching for socket to become readable & writable");
-
- tcp_socket->async_read_some(boost::asio::null_buffers(),
- boost::bind(&event_cb, g,
- tcp_socket,
- act));
-
- tcp_socket->async_write_some(boost::asio::null_buffers(),
- boost::bind(&event_cb, g,
- tcp_socket,
- act));
- }
-}
-
-
-static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
-{
- int *fdp = (int *)calloc(sizeof(int), 1); /* fdp is used to store current action */
-
- setsock(fdp, s, easy, action, g);
- curl_multi_assign(g->multi, s, fdp);
-}
-
-/* CURLMOPT_SOCKETFUNCTION */
-static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
-{
- fprintf(MSG_OUT, "\nsock_cb: socket=%d, what=%d, sockp=%p", s, what, sockp);
-
- GlobalInfo *g = (GlobalInfo*) cbp;
- int *actionp = (int*) sockp;
- const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
-
- fprintf(MSG_OUT,
- "\nsocket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
-
- if ( what == CURL_POLL_REMOVE )
- {
- fprintf(MSG_OUT, "\n");
- remsock(actionp, g);
- }
- else
- {
- if ( !actionp )
- {
- fprintf(MSG_OUT, "\nAdding data: %s", whatstr[what]);
- addsock(s, e, what, g);
- }
- else
- {
- fprintf(MSG_OUT,
- "\nChanging action from %s to %s",
- whatstr[*actionp], whatstr[what]);
- setsock(actionp, s, e, what, g);
- }
- }
- return 0;
-}
-
-
-/* CURLOPT_WRITEFUNCTION */
-static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
-{
-
- size_t written = size * nmemb;
- char* pBuffer = (char*)malloc(written + 1);
-
- strncpy(pBuffer, (const char *)ptr, written);
- pBuffer [written] = '\0';
-
- fprintf(MSG_OUT, "%s", pBuffer);
-
- free(pBuffer);
-
- return written;
-}
-
-
-/* CURLOPT_PROGRESSFUNCTION */
-static int prog_cb (void *p, double dltotal, double dlnow, double ult,
- double uln)
-{
- ConnInfo *conn = (ConnInfo *)p;
- (void)ult;
- (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 closesocket(void *clientp, curl_socket_t item)
-{
- fprintf(MSG_OUT, "\nclosesocket : %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));
- memset(conn, 0, sizeof(ConnInfo));
- conn->error[0]='\0';
-
- 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, closesocket);
-
- 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;
- CURLMcode rc;
- (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;
-}
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