1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
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.
13 *
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.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 /* Example application source code using the multi socket interface to
23 * download many files at once.
24 *
25 * This example features the same basic functionality as hiperfifo.c does,
26 * but this uses libev instead of libevent.
27 *
28 * Written by Jeff Pohlmeyer, converted to use libev by Markus Koetter
29
30 Requires libev and a (POSIX?) system that has mkfifo().
31
32 This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
33 sample programs.
34
35 When running, the program creates the named pipe "hiper.fifo"
36
37 Whenever there is input into the fifo, the program reads the input as a list
38 of URL's and creates some new easy handles to fetch each URL via the
39 curl_multi "hiper" API.
40
41
42 Thus, you can try a single URL:
43 % echo http://www.yahoo.com > hiper.fifo
44
45 Or a whole bunch of them:
46 % cat my-url-list > hiper.fifo
47
48 The fifo buffer is handled almost instantly, so you can even add more URL's
49 while the previous requests are still being downloaded.
50
51 Note:
52 For the sake of simplicity, URL length is limited to 1023 char's !
53
54 This is purely a demo app, all retrieved data is simply discarded by the write
55 callback.
56
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61 #include <stdlib.h>
62 #include <sys/time.h>
63 #include <time.h>
64 #include <unistd.h>
65 #include <sys/poll.h>
66 #include <curl/curl.h>
67 #include <ev.h>
68 #include <fcntl.h>
69 #include <sys/stat.h>
70 #include <errno.h>
71
72 #define DPRINT(x...) printf(x)
73
74 #define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
75
76
77 /* Global information, common to all connections */
78 typedef struct _GlobalInfo
79 {
80 struct ev_loop *loop;
81 struct ev_io fifo_event;
82 struct ev_timer timer_event;
83 CURLM *multi;
84 int still_running;
85 FILE* input;
86 } GlobalInfo;
87
88
89 /* Information associated with a specific easy handle */
90 typedef struct _ConnInfo
91 {
92 CURL *easy;
93 char *url;
94 GlobalInfo *global;
95 char error[CURL_ERROR_SIZE];
96 } ConnInfo;
97
98
99 /* Information associated with a specific socket */
100 typedef struct _SockInfo
101 {
102 curl_socket_t sockfd;
103 CURL *easy;
104 int action;
105 long timeout;
106 struct ev_io ev;
107 int evset;
108 GlobalInfo *global;
109 } SockInfo;
110
111 static void timer_cb(EV_P_ struct ev_timer *w, int revents);
112
113 /* Update the event timer after curl_multi library calls */
multi_timer_cb(CURLM * multi,long timeout_ms,GlobalInfo * g)114 static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
115 {
116 DPRINT("%s %li\n", __PRETTY_FUNCTION__, timeout_ms);
117 ev_timer_stop(g->loop, &g->timer_event);
118 if (timeout_ms > 0)
119 {
120 double t = timeout_ms / 1000;
121 ev_timer_init(&g->timer_event, timer_cb, t, 0.);
122 ev_timer_start(g->loop, &g->timer_event);
123 }else
124 timer_cb(g->loop, &g->timer_event, 0);
125 return 0;
126 }
127
128 /* Die if we get a bad CURLMcode somewhere */
mcode_or_die(const char * where,CURLMcode code)129 static void mcode_or_die(const char *where, CURLMcode code)
130 {
131 if ( CURLM_OK != code )
132 {
133 const char *s;
134 switch ( code )
135 {
136 case CURLM_BAD_HANDLE: s="CURLM_BAD_HANDLE"; break;
137 case CURLM_BAD_EASY_HANDLE: s="CURLM_BAD_EASY_HANDLE"; break;
138 case CURLM_OUT_OF_MEMORY: s="CURLM_OUT_OF_MEMORY"; break;
139 case CURLM_INTERNAL_ERROR: s="CURLM_INTERNAL_ERROR"; break;
140 case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
141 case CURLM_LAST: s="CURLM_LAST"; break;
142 default: s="CURLM_unknown";
143 break;
144 case CURLM_BAD_SOCKET: s="CURLM_BAD_SOCKET";
145 fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
146 /* ignore this error */
147 return;
148 }
149 fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
150 exit(code);
151 }
152 }
153
154
155
156 /* Check for completed transfers, and remove their easy handles */
check_multi_info(GlobalInfo * g)157 static void check_multi_info(GlobalInfo *g)
158 {
159 char *eff_url;
160 CURLMsg *msg;
161 int msgs_left;
162 ConnInfo *conn;
163 CURL *easy;
164 CURLcode res;
165
166 fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
167 while ((msg = curl_multi_info_read(g->multi, &msgs_left))) {
168 if (msg->msg == CURLMSG_DONE) {
169 easy = msg->easy_handle;
170 res = msg->data.result;
171 curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
172 curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
173 fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
174 curl_multi_remove_handle(g->multi, easy);
175 free(conn->url);
176 curl_easy_cleanup(easy);
177 free(conn);
178 }
179 }
180 }
181
182
183
184 /* Called by libevent when we get action on a multi socket */
event_cb(EV_P_ struct ev_io * w,int revents)185 static void event_cb(EV_P_ struct ev_io *w, int revents)
186 {
187 DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
188 GlobalInfo *g = (GlobalInfo*) w->data;
189 CURLMcode rc;
190
191 int action = (revents&EV_READ?CURL_POLL_IN:0)|
192 (revents&EV_WRITE?CURL_POLL_OUT:0);
193 rc = curl_multi_socket_action(g->multi, w->fd, action, &g->still_running);
194 mcode_or_die("event_cb: curl_multi_socket_action", rc);
195 check_multi_info(g);
196 if ( g->still_running <= 0 )
197 {
198 fprintf(MSG_OUT, "last transfer done, kill timeout\n");
199 ev_timer_stop(g->loop, &g->timer_event);
200 }
201 }
202
203 /* Called by libevent when our timeout expires */
timer_cb(EV_P_ struct ev_timer * w,int revents)204 static void timer_cb(EV_P_ struct ev_timer *w, int revents)
205 {
206 DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
207
208 GlobalInfo *g = (GlobalInfo *)w->data;
209 CURLMcode rc;
210
211 rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0, &g->still_running);
212 mcode_or_die("timer_cb: curl_multi_socket_action", rc);
213 check_multi_info(g);
214 }
215
216 /* Clean up the SockInfo structure */
remsock(SockInfo * f,GlobalInfo * g)217 static void remsock(SockInfo *f, GlobalInfo *g)
218 {
219 printf("%s \n", __PRETTY_FUNCTION__);
220 if ( f )
221 {
222 if ( f->evset )
223 ev_io_stop(g->loop, &f->ev);
224 free(f);
225 }
226 }
227
228
229
230 /* Assign information to a SockInfo structure */
setsock(SockInfo * f,curl_socket_t s,CURL * e,int act,GlobalInfo * g)231 static void setsock(SockInfo*f, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
232 {
233 printf("%s \n", __PRETTY_FUNCTION__);
234
235 int kind = (act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0);
236
237 f->sockfd = s;
238 f->action = act;
239 f->easy = e;
240 if ( f->evset )
241 ev_io_stop(g->loop, &f->ev);
242 ev_io_init(&f->ev, event_cb, f->sockfd, kind);
243 f->ev.data = g;
244 f->evset=1;
245 ev_io_start(g->loop, &f->ev);
246 }
247
248
249
250 /* Initialize a new SockInfo structure */
addsock(curl_socket_t s,CURL * easy,int action,GlobalInfo * g)251 static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
252 {
253 SockInfo *fdp = calloc(sizeof(SockInfo), 1);
254
255 fdp->global = g;
256 setsock(fdp, s, easy, action, g);
257 curl_multi_assign(g->multi, s, fdp);
258 }
259
260 /* CURLMOPT_SOCKETFUNCTION */
sock_cb(CURL * e,curl_socket_t s,int what,void * cbp,void * sockp)261 static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
262 {
263 DPRINT("%s e %p s %i what %i cbp %p sockp %p\n",
264 __PRETTY_FUNCTION__, e, s, what, cbp, sockp);
265
266 GlobalInfo *g = (GlobalInfo*) cbp;
267 SockInfo *fdp = (SockInfo*) sockp;
268 const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
269
270 fprintf(MSG_OUT,
271 "socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
272 if ( what == CURL_POLL_REMOVE )
273 {
274 fprintf(MSG_OUT, "\n");
275 remsock(fdp, g);
276 } else
277 {
278 if ( !fdp )
279 {
280 fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
281 addsock(s, e, what, g);
282 } else
283 {
284 fprintf(MSG_OUT,
285 "Changing action from %s to %s\n",
286 whatstr[fdp->action], whatstr[what]);
287 setsock(fdp, s, e, what, g);
288 }
289 }
290 return 0;
291 }
292
293
294 /* CURLOPT_WRITEFUNCTION */
write_cb(void * ptr,size_t size,size_t nmemb,void * data)295 static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
296 {
297 size_t realsize = size * nmemb;
298 ConnInfo *conn = (ConnInfo*) data;
299 (void)ptr;
300 (void)conn;
301 return realsize;
302 }
303
304
305 /* CURLOPT_PROGRESSFUNCTION */
prog_cb(void * p,double dltotal,double dlnow,double ult,double uln)306 static int prog_cb (void *p, double dltotal, double dlnow, double ult,
307 double uln)
308 {
309 ConnInfo *conn = (ConnInfo *)p;
310 (void)ult;
311 (void)uln;
312
313 fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
314 return 0;
315 }
316
317
318 /* Create a new easy handle, and add it to the global curl_multi */
new_conn(char * url,GlobalInfo * g)319 static void new_conn(char *url, GlobalInfo *g )
320 {
321 ConnInfo *conn;
322 CURLMcode rc;
323
324 conn = calloc(1, sizeof(ConnInfo));
325 memset(conn, 0, sizeof(ConnInfo));
326 conn->error[0]='\0';
327
328 conn->easy = curl_easy_init();
329 if ( !conn->easy )
330 {
331 fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
332 exit(2);
333 }
334 conn->global = g;
335 conn->url = strdup(url);
336 curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
337 curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
338 curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
339 curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
340 curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
341 curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
342 curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
343 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
344 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
345 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
346 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
347
348 fprintf(MSG_OUT,
349 "Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
350 rc = curl_multi_add_handle(g->multi, conn->easy);
351 mcode_or_die("new_conn: curl_multi_add_handle", rc);
352
353 /* note that the add_handle() will set a time-out to trigger very soon so
354 that the necessary socket_action() call will be called by this app */
355 }
356
357 /* This gets called whenever data is received from the fifo */
fifo_cb(EV_P_ struct ev_io * w,int revents)358 static void fifo_cb(EV_P_ struct ev_io *w, int revents)
359 {
360 char s[1024];
361 long int rv=0;
362 int n=0;
363 GlobalInfo *g = (GlobalInfo *)w->data;
364
365 do
366 {
367 s[0]='\0';
368 rv=fscanf(g->input, "%1023s%n", s, &n);
369 s[n]='\0';
370 if ( n && s[0] )
371 {
372 new_conn(s,g); /* if we read a URL, go get it! */
373 } else break;
374 } while ( rv != EOF );
375 }
376
377 /* Create a named pipe and tell libevent to monitor it */
init_fifo(GlobalInfo * g)378 static int init_fifo (GlobalInfo *g)
379 {
380 struct stat st;
381 static const char *fifo = "hiper.fifo";
382 curl_socket_t sockfd;
383
384 fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
385 if ( lstat (fifo, &st) == 0 )
386 {
387 if ( (st.st_mode & S_IFMT) == S_IFREG )
388 {
389 errno = EEXIST;
390 perror("lstat");
391 exit (1);
392 }
393 }
394 unlink(fifo);
395 if ( mkfifo (fifo, 0600) == -1 )
396 {
397 perror("mkfifo");
398 exit (1);
399 }
400 sockfd = open(fifo, O_RDWR | O_NONBLOCK, 0);
401 if ( sockfd == -1 )
402 {
403 perror("open");
404 exit (1);
405 }
406 g->input = fdopen(sockfd, "r");
407
408 fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
409 ev_io_init(&g->fifo_event, fifo_cb, sockfd, EV_READ);
410 ev_io_start(g->loop, &g->fifo_event);
411 return(0);
412 }
413
main(int argc,char ** argv)414 int main(int argc, char **argv)
415 {
416 GlobalInfo g;
417 CURLMcode rc;
418 (void)argc;
419 (void)argv;
420
421 memset(&g, 0, sizeof(GlobalInfo));
422 g.loop = ev_default_loop(0);
423
424 init_fifo(&g);
425 g.multi = curl_multi_init();
426
427 ev_timer_init(&g.timer_event, timer_cb, 0., 0.);
428 g.timer_event.data = &g;
429 g.fifo_event.data = &g;
430 curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
431 curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
432 curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
433 curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
434
435 /* we don't call any curl_multi_socket*() function yet as we have no handles
436 added! */
437
438 ev_loop(g.loop, 0);
439 curl_multi_cleanup(g.multi);
440 return 0;
441 }
442