Annotation of embedaddon/curl/docs/examples/evhiperfifo.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, 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 https://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: /* <DESC>
23: * multi socket interface together with libev
24: * </DESC>
25: */
26: /* Example application source code using the multi socket interface to
27: * download many files at once.
28: *
29: * This example features the same basic functionality as hiperfifo.c does,
30: * but this uses libev instead of libevent.
31: *
32: * Written by Jeff Pohlmeyer, converted to use libev by Markus Koetter
33:
34: Requires libev and a (POSIX?) system that has mkfifo().
35:
36: This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
37: sample programs.
38:
39: When running, the program creates the named pipe "hiper.fifo"
40:
41: Whenever there is input into the fifo, the program reads the input as a list
42: of URL's and creates some new easy handles to fetch each URL via the
43: curl_multi "hiper" API.
44:
45:
46: Thus, you can try a single URL:
47: % echo http://www.yahoo.com > hiper.fifo
48:
49: Or a whole bunch of them:
50: % cat my-url-list > hiper.fifo
51:
52: The fifo buffer is handled almost instantly, so you can even add more URL's
53: while the previous requests are still being downloaded.
54:
55: Note:
56: For the sake of simplicity, URL length is limited to 1023 char's !
57:
58: This is purely a demo app, all retrieved data is simply discarded by the write
59: callback.
60:
61: */
62:
63: #include <stdio.h>
64: #include <string.h>
65: #include <stdlib.h>
66: #include <sys/time.h>
67: #include <time.h>
68: #include <unistd.h>
69: #include <sys/poll.h>
70: #include <curl/curl.h>
71: #include <ev.h>
72: #include <fcntl.h>
73: #include <sys/stat.h>
74: #include <errno.h>
75:
76: #define DPRINT(x...) printf(x)
77:
78: #define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
79:
80:
81: /* Global information, common to all connections */
82: typedef struct _GlobalInfo
83: {
84: struct ev_loop *loop;
85: struct ev_io fifo_event;
86: struct ev_timer timer_event;
87: CURLM *multi;
88: int still_running;
89: FILE *input;
90: } GlobalInfo;
91:
92:
93: /* Information associated with a specific easy handle */
94: typedef struct _ConnInfo
95: {
96: CURL *easy;
97: char *url;
98: GlobalInfo *global;
99: char error[CURL_ERROR_SIZE];
100: } ConnInfo;
101:
102:
103: /* Information associated with a specific socket */
104: typedef struct _SockInfo
105: {
106: curl_socket_t sockfd;
107: CURL *easy;
108: int action;
109: long timeout;
110: struct ev_io ev;
111: int evset;
112: GlobalInfo *global;
113: } SockInfo;
114:
115: static void timer_cb(EV_P_ struct ev_timer *w, int revents);
116:
117: /* Update the event timer after curl_multi library calls */
118: static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
119: {
120: DPRINT("%s %li\n", __PRETTY_FUNCTION__, timeout_ms);
121: ev_timer_stop(g->loop, &g->timer_event);
122: if(timeout_ms >= 0) {
123: /* -1 means delete, other values are timeout times in milliseconds */
124: double t = timeout_ms / 1000;
125: ev_timer_init(&g->timer_event, timer_cb, t, 0.);
126: ev_timer_start(g->loop, &g->timer_event);
127: }
128: return 0;
129: }
130:
131: /* Die if we get a bad CURLMcode somewhere */
132: static void mcode_or_die(const char *where, CURLMcode code)
133: {
134: if(CURLM_OK != code) {
135: const char *s;
136: switch(code) {
137: case CURLM_BAD_HANDLE:
138: s = "CURLM_BAD_HANDLE";
139: break;
140: case CURLM_BAD_EASY_HANDLE:
141: s = "CURLM_BAD_EASY_HANDLE";
142: break;
143: case CURLM_OUT_OF_MEMORY:
144: s = "CURLM_OUT_OF_MEMORY";
145: break;
146: case CURLM_INTERNAL_ERROR:
147: s = "CURLM_INTERNAL_ERROR";
148: break;
149: case CURLM_UNKNOWN_OPTION:
150: s = "CURLM_UNKNOWN_OPTION";
151: break;
152: case CURLM_LAST:
153: s = "CURLM_LAST";
154: break;
155: default:
156: s = "CURLM_unknown";
157: break;
158: case CURLM_BAD_SOCKET:
159: s = "CURLM_BAD_SOCKET";
160: fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
161: /* ignore this error */
162: return;
163: }
164: fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
165: exit(code);
166: }
167: }
168:
169:
170:
171: /* Check for completed transfers, and remove their easy handles */
172: static void check_multi_info(GlobalInfo *g)
173: {
174: char *eff_url;
175: CURLMsg *msg;
176: int msgs_left;
177: ConnInfo *conn;
178: CURL *easy;
179: CURLcode res;
180:
181: fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
182: while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
183: if(msg->msg == CURLMSG_DONE) {
184: easy = msg->easy_handle;
185: res = msg->data.result;
186: curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
187: curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
188: fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
189: curl_multi_remove_handle(g->multi, easy);
190: free(conn->url);
191: curl_easy_cleanup(easy);
192: free(conn);
193: }
194: }
195: }
196:
197:
198:
199: /* Called by libevent when we get action on a multi socket */
200: static void event_cb(EV_P_ struct ev_io *w, int revents)
201: {
202: DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
203: GlobalInfo *g = (GlobalInfo*) w->data;
204: CURLMcode rc;
205:
206: int action = ((revents & EV_READ) ? CURL_POLL_IN : 0) |
207: ((revents & EV_WRITE) ? CURL_POLL_OUT : 0);
208: rc = curl_multi_socket_action(g->multi, w->fd, action, &g->still_running);
209: mcode_or_die("event_cb: curl_multi_socket_action", rc);
210: check_multi_info(g);
211: if(g->still_running <= 0) {
212: fprintf(MSG_OUT, "last transfer done, kill timeout\n");
213: ev_timer_stop(g->loop, &g->timer_event);
214: }
215: }
216:
217: /* Called by libevent when our timeout expires */
218: static void timer_cb(EV_P_ struct ev_timer *w, int revents)
219: {
220: DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
221:
222: GlobalInfo *g = (GlobalInfo *)w->data;
223: CURLMcode rc;
224:
225: rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0,
226: &g->still_running);
227: mcode_or_die("timer_cb: curl_multi_socket_action", rc);
228: check_multi_info(g);
229: }
230:
231: /* Clean up the SockInfo structure */
232: static void remsock(SockInfo *f, GlobalInfo *g)
233: {
234: printf("%s \n", __PRETTY_FUNCTION__);
235: if(f) {
236: if(f->evset)
237: ev_io_stop(g->loop, &f->ev);
238: free(f);
239: }
240: }
241:
242:
243:
244: /* Assign information to a SockInfo structure */
245: static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
246: GlobalInfo *g)
247: {
248: printf("%s \n", __PRETTY_FUNCTION__);
249:
250: int kind = ((act & CURL_POLL_IN) ? EV_READ : 0) |
251: ((act & CURL_POLL_OUT) ? EV_WRITE : 0);
252:
253: f->sockfd = s;
254: f->action = act;
255: f->easy = e;
256: if(f->evset)
257: ev_io_stop(g->loop, &f->ev);
258: ev_io_init(&f->ev, event_cb, f->sockfd, kind);
259: f->ev.data = g;
260: f->evset = 1;
261: ev_io_start(g->loop, &f->ev);
262: }
263:
264:
265:
266: /* Initialize a new SockInfo structure */
267: static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
268: {
269: SockInfo *fdp = calloc(sizeof(SockInfo), 1);
270:
271: fdp->global = g;
272: setsock(fdp, s, easy, action, g);
273: curl_multi_assign(g->multi, s, fdp);
274: }
275:
276: /* CURLMOPT_SOCKETFUNCTION */
277: static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
278: {
279: DPRINT("%s e %p s %i what %i cbp %p sockp %p\n",
280: __PRETTY_FUNCTION__, e, s, what, cbp, sockp);
281:
282: GlobalInfo *g = (GlobalInfo*) cbp;
283: SockInfo *fdp = (SockInfo*) sockp;
284: const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
285:
286: fprintf(MSG_OUT,
287: "socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
288: if(what == CURL_POLL_REMOVE) {
289: fprintf(MSG_OUT, "\n");
290: remsock(fdp, g);
291: }
292: else {
293: if(!fdp) {
294: fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
295: addsock(s, e, what, g);
296: }
297: else {
298: fprintf(MSG_OUT,
299: "Changing action from %s to %s\n",
300: whatstr[fdp->action], whatstr[what]);
301: setsock(fdp, s, e, what, g);
302: }
303: }
304: return 0;
305: }
306:
307:
308: /* CURLOPT_WRITEFUNCTION */
309: static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
310: {
311: size_t realsize = size * nmemb;
312: ConnInfo *conn = (ConnInfo*) data;
313: (void)ptr;
314: (void)conn;
315: return realsize;
316: }
317:
318:
319: /* CURLOPT_PROGRESSFUNCTION */
320: static int prog_cb(void *p, double dltotal, double dlnow, double ult,
321: double uln)
322: {
323: ConnInfo *conn = (ConnInfo *)p;
324: (void)ult;
325: (void)uln;
326:
327: fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
328: return 0;
329: }
330:
331:
332: /* Create a new easy handle, and add it to the global curl_multi */
333: static void new_conn(char *url, GlobalInfo *g)
334: {
335: ConnInfo *conn;
336: CURLMcode rc;
337:
338: conn = calloc(1, sizeof(ConnInfo));
339: conn->error[0]='\0';
340:
341: conn->easy = curl_easy_init();
342: if(!conn->easy) {
343: fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
344: exit(2);
345: }
346: conn->global = g;
347: conn->url = strdup(url);
348: curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
349: curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
350: curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
351: curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
352: curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
353: curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
354: curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
355: curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
356: curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
357: curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
358: curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
359:
360: fprintf(MSG_OUT,
361: "Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
362: rc = curl_multi_add_handle(g->multi, conn->easy);
363: mcode_or_die("new_conn: curl_multi_add_handle", rc);
364:
365: /* note that the add_handle() will set a time-out to trigger very soon so
366: that the necessary socket_action() call will be called by this app */
367: }
368:
369: /* This gets called whenever data is received from the fifo */
370: static void fifo_cb(EV_P_ struct ev_io *w, int revents)
371: {
372: char s[1024];
373: long int rv = 0;
374: int n = 0;
375: GlobalInfo *g = (GlobalInfo *)w->data;
376:
377: do {
378: s[0]='\0';
379: rv = fscanf(g->input, "%1023s%n", s, &n);
380: s[n]='\0';
381: if(n && s[0]) {
382: new_conn(s, g); /* if we read a URL, go get it! */
383: }
384: else
385: break;
386: } while(rv != EOF);
387: }
388:
389: /* Create a named pipe and tell libevent to monitor it */
390: static int init_fifo(GlobalInfo *g)
391: {
392: struct stat st;
393: static const char *fifo = "hiper.fifo";
394: curl_socket_t sockfd;
395:
396: fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
397: if(lstat (fifo, &st) == 0) {
398: if((st.st_mode & S_IFMT) == S_IFREG) {
399: errno = EEXIST;
400: perror("lstat");
401: exit(1);
402: }
403: }
404: unlink(fifo);
405: if(mkfifo (fifo, 0600) == -1) {
406: perror("mkfifo");
407: exit(1);
408: }
409: sockfd = open(fifo, O_RDWR | O_NONBLOCK, 0);
410: if(sockfd == -1) {
411: perror("open");
412: exit(1);
413: }
414: g->input = fdopen(sockfd, "r");
415:
416: fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
417: ev_io_init(&g->fifo_event, fifo_cb, sockfd, EV_READ);
418: ev_io_start(g->loop, &g->fifo_event);
419: return (0);
420: }
421:
422: int main(int argc, char **argv)
423: {
424: GlobalInfo g;
425: (void)argc;
426: (void)argv;
427:
428: memset(&g, 0, sizeof(GlobalInfo));
429: g.loop = ev_default_loop(0);
430:
431: init_fifo(&g);
432: g.multi = curl_multi_init();
433:
434: ev_timer_init(&g.timer_event, timer_cb, 0., 0.);
435: g.timer_event.data = &g;
436: g.fifo_event.data = &g;
437: curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
438: curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
439: curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
440: curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
441:
442: /* we don't call any curl_multi_socket*() function yet as we have no handles
443: added! */
444:
445: ev_loop(g.loop, 0);
446: curl_multi_cleanup(g.multi);
447: return 0;
448: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to evhiperfifo.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / curl / docs / examples