1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 * multi socket API usage together with with glib2
26 /* Example application source code using the multi socket interface to
27 * download many files at once.
29 * Written by Jeff Pohlmeyer
31 Requires glib-2.x and a (POSIX?) system that has mkfifo().
33 This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
34 sample programs, adapted to use glib's g_io_channel in place of libevent.
36 When running, the program creates the named pipe "hiper.fifo"
38 Whenever there is input into the fifo, the program reads the input as a list
39 of URL's and creates some new easy handles to fetch each URL via the
40 curl_multi "hiper" API.
43 Thus, you can try a single URL:
44 % echo http://www.yahoo.com > hiper.fifo
46 Or a whole bunch of them:
47 % cat my-url-list > hiper.fifo
49 The fifo buffer is handled almost instantly, so you can even add more URL's
50 while the previous requests are still being downloaded.
52 This is purely a demo app, all retrieved data is simply discarded by the write
65 #include <curl/curl.h>
68 #define MSG_OUT g_print /* Change to "g_error" to write to stderr */
69 #define SHOW_VERBOSE 0 /* Set to non-zero for libcurl messages */
70 #define SHOW_PROGRESS 0 /* Set to non-zero to enable progress callback */
74 /* Global information, common to all connections */
75 typedef struct _GlobalInfo {
83 /* Information associated with a specific easy handle */
84 typedef struct _ConnInfo {
88 char error[CURL_ERROR_SIZE];
92 /* Information associated with a specific socket */
93 typedef struct _SockInfo {
106 /* Die if we get a bad CURLMcode somewhere */
107 static void mcode_or_die(const char *where, CURLMcode code) {
108 if ( CURLM_OK != code ) {
111 case CURLM_BAD_HANDLE: s="CURLM_BAD_HANDLE"; break;
112 case CURLM_BAD_EASY_HANDLE: s="CURLM_BAD_EASY_HANDLE"; break;
113 case CURLM_OUT_OF_MEMORY: s="CURLM_OUT_OF_MEMORY"; break;
114 case CURLM_INTERNAL_ERROR: s="CURLM_INTERNAL_ERROR"; break;
115 case CURLM_BAD_SOCKET: s="CURLM_BAD_SOCKET"; break;
116 case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
117 case CURLM_LAST: s="CURLM_LAST"; break;
118 default: s="CURLM_unknown";
120 MSG_OUT("ERROR: %s returns %s\n", where, s);
127 /* Check for completed transfers, and remove their easy handles */
128 static void check_multi_info(GlobalInfo *g)
137 MSG_OUT("REMAINING: %d\n", g->still_running);
138 while ((msg = curl_multi_info_read(g->multi, &msgs_left))) {
139 if (msg->msg == CURLMSG_DONE) {
140 easy = msg->easy_handle;
141 res = msg->data.result;
142 curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
143 curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
144 MSG_OUT("DONE: %s => (%d) %s\n", eff_url, res, conn->error);
145 curl_multi_remove_handle(g->multi, easy);
147 curl_easy_cleanup(easy);
155 /* Called by glib when our timeout expires */
156 static gboolean timer_cb(gpointer data)
158 GlobalInfo *g = (GlobalInfo *)data;
161 rc = curl_multi_socket_action(g->multi,
162 CURL_SOCKET_TIMEOUT, 0, &g->still_running);
163 mcode_or_die("timer_cb: curl_multi_socket_action", rc);
170 /* Update the event timer after curl_multi library calls */
171 static int update_timeout_cb(CURLM *multi, long timeout_ms, void *userp)
173 struct timeval timeout;
174 GlobalInfo *g=(GlobalInfo *)userp;
175 timeout.tv_sec = timeout_ms/1000;
176 timeout.tv_usec = (timeout_ms%1000)*1000;
178 MSG_OUT("*** update_timeout_cb %ld => %ld:%ld ***\n",
179 timeout_ms, timeout.tv_sec, timeout.tv_usec);
181 g->timer_event = g_timeout_add(timeout_ms, timer_cb, g);
188 /* Called by glib when we get action on a multi socket */
189 static gboolean event_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
191 GlobalInfo *g = (GlobalInfo*) data;
193 int fd=g_io_channel_unix_get_fd(ch);
196 (condition & G_IO_IN ? CURL_CSELECT_IN : 0) |
197 (condition & G_IO_OUT ? CURL_CSELECT_OUT : 0);
199 rc = curl_multi_socket_action(g->multi, fd, action, &g->still_running);
200 mcode_or_die("event_cb: curl_multi_socket_action", rc);
203 if(g->still_running) {
206 MSG_OUT("last transfer done, kill timeout\n");
207 if (g->timer_event) { g_source_remove(g->timer_event); }
214 /* Clean up the SockInfo structure */
215 static void remsock(SockInfo *f)
218 if (f->ev) { g_source_remove(f->ev); }
224 /* Assign information to a SockInfo structure */
225 static void setsock(SockInfo*f, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
228 (act&CURL_POLL_IN?G_IO_IN:0)|(act&CURL_POLL_OUT?G_IO_OUT:0);
233 if (f->ev) { g_source_remove(f->ev); }
234 f->ev=g_io_add_watch(f->ch, kind, event_cb,g);
240 /* Initialize a new SockInfo structure */
241 static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
243 SockInfo *fdp = g_malloc0(sizeof(SockInfo));
246 fdp->ch=g_io_channel_unix_new(s);
247 setsock(fdp, s, easy, action, g);
248 curl_multi_assign(g->multi, s, fdp);
253 /* CURLMOPT_SOCKETFUNCTION */
254 static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
256 GlobalInfo *g = (GlobalInfo*) cbp;
257 SockInfo *fdp = (SockInfo*) sockp;
258 static const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
260 MSG_OUT("socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
261 if (what == CURL_POLL_REMOVE) {
266 MSG_OUT("Adding data: %s%s\n",
267 what&CURL_POLL_IN?"READ":"",
268 what&CURL_POLL_OUT?"WRITE":"" );
269 addsock(s, e, what, g);
273 "Changing action from %d to %d\n", fdp->action, what);
274 setsock(fdp, s, e, what, g);
282 /* CURLOPT_WRITEFUNCTION */
283 static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
285 size_t realsize = size * nmemb;
286 ConnInfo *conn = (ConnInfo*) data;
294 /* CURLOPT_PROGRESSFUNCTION */
295 static int prog_cb (void *p, double dltotal, double dlnow, double ult, double uln)
297 ConnInfo *conn = (ConnInfo *)p;
298 MSG_OUT("Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
304 /* Create a new easy handle, and add it to the global curl_multi */
305 static void new_conn(char *url, GlobalInfo *g )
310 conn = g_malloc0(sizeof(ConnInfo));
314 conn->easy = curl_easy_init();
316 MSG_OUT("curl_easy_init() failed, exiting!\n");
320 conn->url = g_strdup(url);
321 curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
322 curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
323 curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, &conn);
324 curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, (long)SHOW_VERBOSE);
325 curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
326 curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
327 curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, SHOW_PROGRESS?0L:1L);
328 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
329 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
330 curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
331 curl_easy_setopt(conn->easy, CURLOPT_CONNECTTIMEOUT, 30L);
332 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 1L);
333 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 30L);
335 MSG_OUT("Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
336 rc =curl_multi_add_handle(g->multi, conn->easy);
337 mcode_or_die("new_conn: curl_multi_add_handle", rc);
339 /* note that the add_handle() will set a time-out to trigger very soon so
340 that the necessary socket_action() call will be called by this app */
344 /* This gets called by glib whenever data is received from the fifo */
345 static gboolean fifo_cb (GIOChannel *ch, GIOCondition condition, gpointer data)
347 #define BUF_SIZE 1024
349 gchar *buf, *tmp, *all=NULL;
354 rv = g_io_channel_read_line (ch,&buf,&len,&tp,&err);
356 if (tp) { buf[tp]='\0'; }
357 new_conn(buf,(GlobalInfo*)data);
360 buf = g_malloc(BUF_SIZE+1);
363 g_io_channel_read_chars(ch,buf,BUF_SIZE,&len,&err);
368 all=g_strdup_printf("%s%s", tmp, buf);
378 new_conn(all,(GlobalInfo*)data);
384 g_error("fifo_cb: %s", err->message);
388 } while ( (len) && (rv == G_IO_STATUS_NORMAL) );
398 const char *fifo = "hiper.fifo";
401 if (lstat (fifo, &st) == 0) {
402 if ((st.st_mode & S_IFMT) == S_IFREG) {
410 if (mkfifo (fifo, 0600) == -1) {
415 socket = open (fifo, O_RDWR | O_NONBLOCK, 0);
421 MSG_OUT("Now, pipe some URL's into > %s\n", fifo);
430 int main(int argc, char **argv)
437 g=g_malloc0(sizeof(GlobalInfo));
440 ch=g_io_channel_unix_new(fd);
441 g_io_add_watch(ch,G_IO_IN,fifo_cb,g);
442 gmain=g_main_loop_new(NULL,FALSE);
443 g->multi = curl_multi_init();
444 curl_multi_setopt(g->multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
445 curl_multi_setopt(g->multi, CURLMOPT_SOCKETDATA, g);
446 curl_multi_setopt(g->multi, CURLMOPT_TIMERFUNCTION, update_timeout_cb);
447 curl_multi_setopt(g->multi, CURLMOPT_TIMERDATA, g);
449 /* we don't call any curl_multi_socket*() function yet as we have no handles
452 g_main_loop_run(gmain);
453 curl_multi_cleanup(g->multi);