1 /*****************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
9 * Example application source code using the multi socket interface to
10 * download many files at once.
12 * Written by Jeff Pohlmeyer
14 Requires glib-2.x and a (POSIX?) system that has mkfifo().
16 This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
17 sample programs, adapted to use glib's g_io_channel in place of libevent.
19 When running, the program creates the named pipe "hiper.fifo"
21 Whenever there is input into the fifo, the program reads the input as a list
22 of URL's and creates some new easy handles to fetch each URL via the
23 curl_multi "hiper" API.
26 Thus, you can try a single URL:
27 % echo http://www.yahoo.com > hiper.fifo
29 Or a whole bunch of them:
30 % cat my-url-list > hiper.fifo
32 The fifo buffer is handled almost instantly, so you can even add more URL's
33 while the previous requests are still being downloaded.
35 This is purely a demo app, all retrieved data is simply discarded by the write
48 #include <curl/curl.h>
51 #define MSG_OUT g_print /* Change to "g_error" to write to stderr */
52 #define SHOW_VERBOSE 0 /* Set to non-zero for libcurl messages */
53 #define SHOW_PROGRESS 0 /* Set to non-zero to enable progress callback */
57 /* Global information, common to all connections */
58 typedef struct _GlobalInfo {
66 /* Information associated with a specific easy handle */
67 typedef struct _ConnInfo {
71 char error[CURL_ERROR_SIZE];
75 /* Information associated with a specific socket */
76 typedef struct _SockInfo {
89 /* Die if we get a bad CURLMcode somewhere */
90 static void mcode_or_die(const char *where, CURLMcode code) {
91 if ( CURLM_OK != code ) {
94 case CURLM_CALL_MULTI_PERFORM: s="CURLM_CALL_MULTI_PERFORM"; break;
95 case CURLM_BAD_HANDLE: s="CURLM_BAD_HANDLE"; break;
96 case CURLM_BAD_EASY_HANDLE: s="CURLM_BAD_EASY_HANDLE"; break;
97 case CURLM_OUT_OF_MEMORY: s="CURLM_OUT_OF_MEMORY"; break;
98 case CURLM_INTERNAL_ERROR: s="CURLM_INTERNAL_ERROR"; break;
99 case CURLM_BAD_SOCKET: s="CURLM_BAD_SOCKET"; break;
100 case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
101 case CURLM_LAST: s="CURLM_LAST"; break;
102 default: s="CURLM_unknown";
104 MSG_OUT("ERROR: %s returns %s\n", where, s);
111 /* Check for completed transfers, and remove their easy handles */
112 static void check_multi_info(GlobalInfo *g)
121 MSG_OUT("REMAINING: %d\n", g->still_running);
122 while ((msg = curl_multi_info_read(g->multi, &msgs_left))) {
123 if (msg->msg == CURLMSG_DONE) {
124 easy = msg->easy_handle;
125 res = msg->data.result;
126 curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
127 curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
128 MSG_OUT("DONE: %s => (%d) %s\n", eff_url, res, conn->error);
129 curl_multi_remove_handle(g->multi, easy);
131 curl_easy_cleanup(easy);
139 /* Called by glib when our timeout expires */
140 static gboolean timer_cb(gpointer data)
142 GlobalInfo *g = (GlobalInfo *)data;
145 rc = curl_multi_socket_action(g->multi,
146 CURL_SOCKET_TIMEOUT, 0, &g->still_running);
147 mcode_or_die("timer_cb: curl_multi_socket_action", rc);
154 /* Update the event timer after curl_multi library calls */
155 static int update_timeout_cb(CURLM *multi, long timeout_ms, void *userp)
157 struct timeval timeout;
158 GlobalInfo *g=(GlobalInfo *)userp;
159 timeout.tv_sec = timeout_ms/1000;
160 timeout.tv_usec = (timeout_ms%1000)*1000;
162 MSG_OUT("*** update_timeout_cb %ld => %ld:%ld ***\n",
163 timeout_ms, timeout.tv_sec, timeout.tv_usec);
165 g->timer_event = g_timeout_add(timeout_ms, timer_cb, g);
172 /* Called by glib when we get action on a multi socket */
173 static gboolean event_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
175 GlobalInfo *g = (GlobalInfo*) data;
177 int fd=g_io_channel_unix_get_fd(ch);
180 (condition & G_IO_IN ? CURL_CSELECT_IN : 0) |
181 (condition & G_IO_OUT ? CURL_CSELECT_OUT : 0);
183 rc = curl_multi_socket_action(g->multi, fd, action, &g->still_running);
184 mcode_or_die("event_cb: curl_multi_socket_action", rc);
187 if(g->still_running) {
190 MSG_OUT("last transfer done, kill timeout\n");
191 if (g->timer_event) { g_source_remove(g->timer_event); }
198 /* Clean up the SockInfo structure */
199 static void remsock(SockInfo *f)
202 if (f->ev) { g_source_remove(f->ev); }
208 /* Assign information to a SockInfo structure */
209 static void setsock(SockInfo*f, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
212 (act&CURL_POLL_IN?G_IO_IN:0)|(act&CURL_POLL_OUT?G_IO_OUT:0);
217 if (f->ev) { g_source_remove(f->ev); }
218 f->ev=g_io_add_watch(f->ch, kind, event_cb,g);
224 /* Initialize a new SockInfo structure */
225 static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
227 SockInfo *fdp = g_malloc0(sizeof(SockInfo));
230 fdp->ch=g_io_channel_unix_new(s);
231 setsock(fdp, s, easy, action, g);
232 curl_multi_assign(g->multi, s, fdp);
237 /* CURLMOPT_SOCKETFUNCTION */
238 static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
240 GlobalInfo *g = (GlobalInfo*) cbp;
241 SockInfo *fdp = (SockInfo*) sockp;
242 static const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
244 MSG_OUT("socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
245 if (what == CURL_POLL_REMOVE) {
250 MSG_OUT("Adding data: %s%s\n",
251 what&CURL_POLL_IN?"READ":"",
252 what&CURL_POLL_OUT?"WRITE":"" );
253 addsock(s, e, what, g);
257 "Changing action from %d to %d\n", fdp->action, what);
258 setsock(fdp, s, e, what, g);
266 /* CURLOPT_WRITEFUNCTION */
267 static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
269 size_t realsize = size * nmemb;
270 ConnInfo *conn = (ConnInfo*) data;
278 /* CURLOPT_PROGRESSFUNCTION */
279 static int prog_cb (void *p, double dltotal, double dlnow, double ult, double uln)
281 ConnInfo *conn = (ConnInfo *)p;
282 MSG_OUT("Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
288 /* Create a new easy handle, and add it to the global curl_multi */
289 static void new_conn(char *url, GlobalInfo *g )
294 conn = g_malloc0(sizeof(ConnInfo));
298 conn->easy = curl_easy_init();
300 MSG_OUT("curl_easy_init() failed, exiting!\n");
304 conn->url = g_strdup(url);
305 curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
306 curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
307 curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, &conn);
308 curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, (long)SHOW_VERBOSE);
309 curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
310 curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
311 curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, SHOW_PROGRESS?0L:1L);
312 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
313 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
314 curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
315 curl_easy_setopt(conn->easy, CURLOPT_CONNECTTIMEOUT, 30L);
316 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 1L);
317 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 30L);
319 MSG_OUT("Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
320 rc =curl_multi_add_handle(g->multi, conn->easy);
321 mcode_or_die("new_conn: curl_multi_add_handle", rc);
323 /* note that the add_handle() will set a time-out to trigger very soon so
324 that the necessary socket_action() call will be called by this app */
328 /* This gets called by glib whenever data is received from the fifo */
329 static gboolean fifo_cb (GIOChannel *ch, GIOCondition condition, gpointer data)
331 #define BUF_SIZE 1024
333 gchar *buf, *tmp, *all=NULL;
338 rv = g_io_channel_read_line (ch,&buf,&len,&tp,&err);
340 if (tp) { buf[tp]='\0'; }
341 new_conn(buf,(GlobalInfo*)data);
344 buf = g_malloc(BUF_SIZE+1);
347 g_io_channel_read_chars(ch,buf,BUF_SIZE,&len,&err);
352 all=g_strdup_printf("%s%s", tmp, buf);
362 new_conn(all,(GlobalInfo*)data);
368 g_error("fifo_cb: %s", err->message);
372 } while ( (len) && (rv == G_IO_STATUS_NORMAL) );
382 const char *fifo = "hiper.fifo";
385 if (lstat (fifo, &st) == 0) {
386 if ((st.st_mode & S_IFMT) == S_IFREG) {
394 if (mkfifo (fifo, 0600) == -1) {
399 socket = open (fifo, O_RDWR | O_NONBLOCK, 0);
405 MSG_OUT("Now, pipe some URL's into > %s\n", fifo);
414 int main(int argc, char **argv)
421 g=g_malloc0(sizeof(GlobalInfo));
424 ch=g_io_channel_unix_new(fd);
425 g_io_add_watch(ch,G_IO_IN,fifo_cb,g);
426 gmain=g_main_loop_new(NULL,FALSE);
427 g->multi = curl_multi_init();
428 curl_multi_setopt(g->multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
429 curl_multi_setopt(g->multi, CURLMOPT_SOCKETDATA, g);
430 curl_multi_setopt(g->multi, CURLMOPT_TIMERFUNCTION, update_timeout_cb);
431 curl_multi_setopt(g->multi, CURLMOPT_TIMERDATA, g);
433 /* we don't call any curl_multi_socket*() function yet as we have no handles
436 g_main_loop_run(gmain);
437 curl_multi_cleanup(g->multi);