mirror of
https://github.com/curl/curl.git
synced 2024-11-27 05:50:21 +08:00
616a0099d1
Blocking connect on the socket has been removed from opensocket callback. opensocket just opens a new socket and gives it back to libcurl and libcurl will take care of the connect. sockopt_callback has also been removed, as it is no longer required.
455 lines
13 KiB
C++
455 lines
13 KiB
C++
/***************************************************************************
|
|
* _ _ ____ _
|
|
* 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;
|
|
}
|