Annotation of embedaddon/curl/docs/examples/ghiper.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 API usage together with with glib2
24: * </DESC>
25: */
26: /* Example application source code using the multi socket interface to
27: * download many files at once.
28: *
29: * Written by Jeff Pohlmeyer
30:
31: Requires glib-2.x and a (POSIX?) system that has mkfifo().
32:
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.
35:
36: When running, the program creates the named pipe "hiper.fifo"
37:
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.
41:
42:
43: Thus, you can try a single URL:
44: % echo http://www.yahoo.com > hiper.fifo
45:
46: Or a whole bunch of them:
47: % cat my-url-list > hiper.fifo
48:
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.
51:
52: This is purely a demo app, all retrieved data is simply discarded by the write
53: callback.
54:
55: */
56:
57: #include <glib.h>
58: #include <sys/stat.h>
59: #include <unistd.h>
60: #include <fcntl.h>
61: #include <stdlib.h>
62: #include <stdio.h>
63: #include <errno.h>
64: #include <curl/curl.h>
65:
66: #define MSG_OUT g_print /* Change to "g_error" to write to stderr */
67: #define SHOW_VERBOSE 0 /* Set to non-zero for libcurl messages */
68: #define SHOW_PROGRESS 0 /* Set to non-zero to enable progress callback */
69:
70: /* Global information, common to all connections */
71: typedef struct _GlobalInfo {
72: CURLM *multi;
73: guint timer_event;
74: int still_running;
75: } GlobalInfo;
76:
77: /* Information associated with a specific easy handle */
78: typedef struct _ConnInfo {
79: CURL *easy;
80: char *url;
81: GlobalInfo *global;
82: char error[CURL_ERROR_SIZE];
83: } ConnInfo;
84:
85: /* Information associated with a specific socket */
86: typedef struct _SockInfo {
87: curl_socket_t sockfd;
88: CURL *easy;
89: int action;
90: long timeout;
91: GIOChannel *ch;
92: guint ev;
93: GlobalInfo *global;
94: } SockInfo;
95:
96: /* Die if we get a bad CURLMcode somewhere */
97: static void mcode_or_die(const char *where, CURLMcode code)
98: {
99: if(CURLM_OK != code) {
100: const char *s;
101: switch(code) {
102: case CURLM_BAD_HANDLE: s = "CURLM_BAD_HANDLE"; break;
103: case CURLM_BAD_EASY_HANDLE: s = "CURLM_BAD_EASY_HANDLE"; break;
104: case CURLM_OUT_OF_MEMORY: s = "CURLM_OUT_OF_MEMORY"; break;
105: case CURLM_INTERNAL_ERROR: s = "CURLM_INTERNAL_ERROR"; break;
106: case CURLM_BAD_SOCKET: s = "CURLM_BAD_SOCKET"; break;
107: case CURLM_UNKNOWN_OPTION: s = "CURLM_UNKNOWN_OPTION"; break;
108: case CURLM_LAST: s = "CURLM_LAST"; break;
109: default: s = "CURLM_unknown";
110: }
111: MSG_OUT("ERROR: %s returns %s\n", where, s);
112: exit(code);
113: }
114: }
115:
116: /* Check for completed transfers, and remove their easy handles */
117: static void check_multi_info(GlobalInfo *g)
118: {
119: char *eff_url;
120: CURLMsg *msg;
121: int msgs_left;
122: ConnInfo *conn;
123: CURL *easy;
124: CURLcode res;
125:
126: MSG_OUT("REMAINING: %d\n", g->still_running);
127: while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
128: if(msg->msg == CURLMSG_DONE) {
129: easy = msg->easy_handle;
130: res = msg->data.result;
131: curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
132: curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
133: MSG_OUT("DONE: %s => (%d) %s\n", eff_url, res, conn->error);
134: curl_multi_remove_handle(g->multi, easy);
135: free(conn->url);
136: curl_easy_cleanup(easy);
137: free(conn);
138: }
139: }
140: }
141:
142: /* Called by glib when our timeout expires */
143: static gboolean timer_cb(gpointer data)
144: {
145: GlobalInfo *g = (GlobalInfo *)data;
146: CURLMcode rc;
147:
148: rc = curl_multi_socket_action(g->multi,
149: CURL_SOCKET_TIMEOUT, 0, &g->still_running);
150: mcode_or_die("timer_cb: curl_multi_socket_action", rc);
151: check_multi_info(g);
152: return FALSE;
153: }
154:
155: /* Update the event timer after curl_multi library calls */
156: static int update_timeout_cb(CURLM *multi, long timeout_ms, void *userp)
157: {
158: struct timeval timeout;
159: GlobalInfo *g = (GlobalInfo *)userp;
160: timeout.tv_sec = timeout_ms/1000;
161: timeout.tv_usec = (timeout_ms%1000)*1000;
162:
163: MSG_OUT("*** update_timeout_cb %ld => %ld:%ld ***\n",
164: timeout_ms, timeout.tv_sec, timeout.tv_usec);
165:
166: /*
167: * if timeout_ms is -1, just delete the timer
168: *
169: * For other values of timeout_ms, this should set or *update* the timer to
170: * the new value
171: */
172: if(timeout_ms >= 0)
173: g->timer_event = g_timeout_add(timeout_ms, timer_cb, g);
174: return 0;
175: }
176:
177: /* Called by glib when we get action on a multi socket */
178: static gboolean event_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
179: {
180: GlobalInfo *g = (GlobalInfo*) data;
181: CURLMcode rc;
182: int fd = g_io_channel_unix_get_fd(ch);
183:
184: int action =
185: ((condition & G_IO_IN) ? CURL_CSELECT_IN : 0) |
186: ((condition & G_IO_OUT) ? CURL_CSELECT_OUT : 0);
187:
188: rc = curl_multi_socket_action(g->multi, fd, action, &g->still_running);
189: mcode_or_die("event_cb: curl_multi_socket_action", rc);
190:
191: check_multi_info(g);
192: if(g->still_running) {
193: return TRUE;
194: }
195: else {
196: MSG_OUT("last transfer done, kill timeout\n");
197: if(g->timer_event) {
198: g_source_remove(g->timer_event);
199: }
200: return FALSE;
201: }
202: }
203:
204: /* Clean up the SockInfo structure */
205: static void remsock(SockInfo *f)
206: {
207: if(!f) {
208: return;
209: }
210: if(f->ev) {
211: g_source_remove(f->ev);
212: }
213: g_free(f);
214: }
215:
216: /* Assign information to a SockInfo structure */
217: static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
218: GlobalInfo *g)
219: {
220: GIOCondition kind =
221: ((act & CURL_POLL_IN) ? G_IO_IN : 0) |
222: ((act & CURL_POLL_OUT) ? G_IO_OUT : 0);
223:
224: f->sockfd = s;
225: f->action = act;
226: f->easy = e;
227: if(f->ev) {
228: g_source_remove(f->ev);
229: }
230: f->ev = g_io_add_watch(f->ch, kind, event_cb, g);
231: }
232:
233: /* Initialize a new SockInfo structure */
234: static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
235: {
236: SockInfo *fdp = g_malloc0(sizeof(SockInfo));
237:
238: fdp->global = g;
239: fdp->ch = g_io_channel_unix_new(s);
240: setsock(fdp, s, easy, action, g);
241: curl_multi_assign(g->multi, s, fdp);
242: }
243:
244: /* CURLMOPT_SOCKETFUNCTION */
245: static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
246: {
247: GlobalInfo *g = (GlobalInfo*) cbp;
248: SockInfo *fdp = (SockInfo*) sockp;
249: static const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
250:
251: MSG_OUT("socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
252: if(what == CURL_POLL_REMOVE) {
253: MSG_OUT("\n");
254: remsock(fdp);
255: }
256: else {
257: if(!fdp) {
258: MSG_OUT("Adding data: %s%s\n",
259: (what & CURL_POLL_IN) ? "READ" : "",
260: (what & CURL_POLL_OUT) ? "WRITE" : "");
261: addsock(s, e, what, g);
262: }
263: else {
264: MSG_OUT(
265: "Changing action from %d to %d\n", fdp->action, what);
266: setsock(fdp, s, e, what, g);
267: }
268: }
269: return 0;
270: }
271:
272: /* CURLOPT_WRITEFUNCTION */
273: static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
274: {
275: size_t realsize = size * nmemb;
276: ConnInfo *conn = (ConnInfo*) data;
277: (void)ptr;
278: (void)conn;
279: return realsize;
280: }
281:
282: /* CURLOPT_PROGRESSFUNCTION */
283: static int prog_cb(void *p, double dltotal, double dlnow, double ult,
284: double uln)
285: {
286: ConnInfo *conn = (ConnInfo *)p;
287: MSG_OUT("Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
288: return 0;
289: }
290:
291: /* Create a new easy handle, and add it to the global curl_multi */
292: static void new_conn(char *url, GlobalInfo *g)
293: {
294: ConnInfo *conn;
295: CURLMcode rc;
296:
297: conn = g_malloc0(sizeof(ConnInfo));
298: conn->error[0]='\0';
299: conn->easy = curl_easy_init();
300: if(!conn->easy) {
301: MSG_OUT("curl_easy_init() failed, exiting!\n");
302: exit(2);
303: }
304: conn->global = g;
305: conn->url = g_strdup(url);
306: curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
307: curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
308: curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, &conn);
309: curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, (long)SHOW_VERBOSE);
310: curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
311: curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
312: curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, SHOW_PROGRESS?0L:1L);
313: curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
314: curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
315: curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
316: curl_easy_setopt(conn->easy, CURLOPT_CONNECTTIMEOUT, 30L);
317: curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 1L);
318: curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 30L);
319:
320: MSG_OUT("Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
321: rc = curl_multi_add_handle(g->multi, conn->easy);
322: mcode_or_die("new_conn: curl_multi_add_handle", rc);
323:
324: /* note that the add_handle() will set a time-out to trigger very soon so
325: that the necessary socket_action() call will be called by this app */
326: }
327:
328: /* This gets called by glib whenever data is received from the fifo */
329: static gboolean fifo_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
330: {
331: #define BUF_SIZE 1024
332: gsize len, tp;
333: gchar *buf, *tmp, *all = NULL;
334: GIOStatus rv;
335:
336: do {
337: GError *err = NULL;
338: rv = g_io_channel_read_line(ch, &buf, &len, &tp, &err);
339: if(buf) {
340: if(tp) {
341: buf[tp]='\0';
342: }
343: new_conn(buf, (GlobalInfo*)data);
344: g_free(buf);
345: }
346: else {
347: buf = g_malloc(BUF_SIZE + 1);
348: while(TRUE) {
349: buf[BUF_SIZE]='\0';
350: g_io_channel_read_chars(ch, buf, BUF_SIZE, &len, &err);
351: if(len) {
352: buf[len]='\0';
353: if(all) {
354: tmp = all;
355: all = g_strdup_printf("%s%s", tmp, buf);
356: g_free(tmp);
357: }
358: else {
359: all = g_strdup(buf);
360: }
361: }
362: else {
363: break;
364: }
365: }
366: if(all) {
367: new_conn(all, (GlobalInfo*)data);
368: g_free(all);
369: }
370: g_free(buf);
371: }
372: if(err) {
373: g_error("fifo_cb: %s", err->message);
374: g_free(err);
375: break;
376: }
377: } while((len) && (rv == G_IO_STATUS_NORMAL));
378: return TRUE;
379: }
380:
381: int init_fifo(void)
382: {
383: struct stat st;
384: const char *fifo = "hiper.fifo";
385: int socket;
386:
387: if(lstat (fifo, &st) == 0) {
388: if((st.st_mode & S_IFMT) == S_IFREG) {
389: errno = EEXIST;
390: perror("lstat");
391: exit(1);
392: }
393: }
394:
395: unlink(fifo);
396: if(mkfifo (fifo, 0600) == -1) {
397: perror("mkfifo");
398: exit(1);
399: }
400:
401: socket = open(fifo, O_RDWR | O_NONBLOCK, 0);
402:
403: if(socket == -1) {
404: perror("open");
405: exit(1);
406: }
407: MSG_OUT("Now, pipe some URL's into > %s\n", fifo);
408:
409: return socket;
410: }
411:
412: int main(int argc, char **argv)
413: {
414: GlobalInfo *g;
415: GMainLoop*gmain;
416: int fd;
417: GIOChannel* ch;
418: g = g_malloc0(sizeof(GlobalInfo));
419:
420: fd = init_fifo();
421: ch = g_io_channel_unix_new(fd);
422: g_io_add_watch(ch, G_IO_IN, fifo_cb, g);
423: gmain = g_main_loop_new(NULL, FALSE);
424: g->multi = curl_multi_init();
425: curl_multi_setopt(g->multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
426: curl_multi_setopt(g->multi, CURLMOPT_SOCKETDATA, g);
427: curl_multi_setopt(g->multi, CURLMOPT_TIMERFUNCTION, update_timeout_cb);
428: curl_multi_setopt(g->multi, CURLMOPT_TIMERDATA, g);
429:
430: /* we don't call any curl_multi_socket*() function yet as we have no handles
431: added! */
432:
433: g_main_loop_run(gmain);
434: curl_multi_cleanup(g->multi);
435: return 0;
436: }
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