Annotation of embedaddon/curl/docs/examples/http2-download.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: * Multiplexed HTTP/2 downloads over a single connection
24: * </DESC>
25: */
26: #include <stdio.h>
27: #include <stdlib.h>
28: #include <string.h>
29:
30: /* somewhat unix-specific */
31: #include <sys/time.h>
32: #include <unistd.h>
33:
34: /* curl stuff */
35: #include <curl/curl.h>
36:
37: #ifndef CURLPIPE_MULTIPLEX
38: /* This little trick will just make sure that we don't enable pipelining for
39: libcurls old enough to not have this symbol. It is _not_ defined to zero in
40: a recent libcurl header. */
41: #define CURLPIPE_MULTIPLEX 0
42: #endif
43:
44: struct transfer {
45: CURL *easy;
46: unsigned int num;
47: FILE *out;
48: };
49:
50: #define NUM_HANDLES 1000
51:
52: static
53: void dump(const char *text, int num, unsigned char *ptr, size_t size,
54: char nohex)
55: {
56: size_t i;
57: size_t c;
58:
59: unsigned int width = 0x10;
60:
61: if(nohex)
62: /* without the hex output, we can fit more on screen */
63: width = 0x40;
64:
65: fprintf(stderr, "%d %s, %lu bytes (0x%lx)\n",
66: num, text, (unsigned long)size, (unsigned long)size);
67:
68: for(i = 0; i<size; i += width) {
69:
70: fprintf(stderr, "%4.4lx: ", (unsigned long)i);
71:
72: if(!nohex) {
73: /* hex not disabled, show it */
74: for(c = 0; c < width; c++)
75: if(i + c < size)
76: fprintf(stderr, "%02x ", ptr[i + c]);
77: else
78: fputs(" ", stderr);
79: }
80:
81: for(c = 0; (c < width) && (i + c < size); c++) {
82: /* check for 0D0A; if found, skip past and start a new line of output */
83: if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
84: ptr[i + c + 1] == 0x0A) {
85: i += (c + 2 - width);
86: break;
87: }
88: fprintf(stderr, "%c",
89: (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
90: /* check again for 0D0A, to avoid an extra \n if it's at width */
91: if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
92: ptr[i + c + 2] == 0x0A) {
93: i += (c + 3 - width);
94: break;
95: }
96: }
97: fputc('\n', stderr); /* newline */
98: }
99: }
100:
101: static
102: int my_trace(CURL *handle, curl_infotype type,
103: char *data, size_t size,
104: void *userp)
105: {
106: const char *text;
107: struct transfer *t = (struct transfer *)userp;
108: unsigned int num = t->num;
109: (void)handle; /* prevent compiler warning */
110:
111: switch(type) {
112: case CURLINFO_TEXT:
113: fprintf(stderr, "== %u Info: %s", num, data);
114: /* FALLTHROUGH */
115: default: /* in case a new one is introduced to shock us */
116: return 0;
117:
118: case CURLINFO_HEADER_OUT:
119: text = "=> Send header";
120: break;
121: case CURLINFO_DATA_OUT:
122: text = "=> Send data";
123: break;
124: case CURLINFO_SSL_DATA_OUT:
125: text = "=> Send SSL data";
126: break;
127: case CURLINFO_HEADER_IN:
128: text = "<= Recv header";
129: break;
130: case CURLINFO_DATA_IN:
131: text = "<= Recv data";
132: break;
133: case CURLINFO_SSL_DATA_IN:
134: text = "<= Recv SSL data";
135: break;
136: }
137:
138: dump(text, num, (unsigned char *)data, size, 1);
139: return 0;
140: }
141:
142: static void setup(struct transfer *t, int num)
143: {
144: char filename[128];
145: CURL *hnd;
146:
147: hnd = t->easy = curl_easy_init();
148:
149: snprintf(filename, 128, "dl-%d", num);
150:
151: t->out = fopen(filename, "wb");
152:
153: /* write to this file */
154: curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
155:
156: /* set the same URL */
157: curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
158:
159: /* please be verbose */
160: curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
161: curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
162: curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
163:
164: /* HTTP/2 please */
165: curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
166:
167: /* we use a self-signed test server, skip verification during debugging */
168: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
169: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
170:
171: #if (CURLPIPE_MULTIPLEX > 0)
172: /* wait for pipe connection to confirm */
173: curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
174: #endif
175: }
176:
177: /*
178: * Download many transfers over HTTP/2, using the same connection!
179: */
180: int main(int argc, char **argv)
181: {
182: struct transfer trans[NUM_HANDLES];
183: CURLM *multi_handle;
184: int i;
185: int still_running = 0; /* keep number of running handles */
186: int num_transfers;
187: if(argc > 1) {
188: /* if given a number, do that many transfers */
189: num_transfers = atoi(argv[1]);
190: if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
191: num_transfers = 3; /* a suitable low default */
192: }
193: else
194: num_transfers = 3; /* suitable default */
195:
196: /* init a multi stack */
197: multi_handle = curl_multi_init();
198:
199: for(i = 0; i < num_transfers; i++) {
200: setup(&trans[i], i);
201:
202: /* add the individual transfer */
203: curl_multi_add_handle(multi_handle, trans[i].easy);
204: }
205:
206: curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
207:
208: /* we start some action by calling perform right away */
209: curl_multi_perform(multi_handle, &still_running);
210:
211: while(still_running) {
212: struct timeval timeout;
213: int rc; /* select() return code */
214: CURLMcode mc; /* curl_multi_fdset() return code */
215:
216: fd_set fdread;
217: fd_set fdwrite;
218: fd_set fdexcep;
219: int maxfd = -1;
220:
221: long curl_timeo = -1;
222:
223: FD_ZERO(&fdread);
224: FD_ZERO(&fdwrite);
225: FD_ZERO(&fdexcep);
226:
227: /* set a suitable timeout to play around with */
228: timeout.tv_sec = 1;
229: timeout.tv_usec = 0;
230:
231: curl_multi_timeout(multi_handle, &curl_timeo);
232: if(curl_timeo >= 0) {
233: timeout.tv_sec = curl_timeo / 1000;
234: if(timeout.tv_sec > 1)
235: timeout.tv_sec = 1;
236: else
237: timeout.tv_usec = (curl_timeo % 1000) * 1000;
238: }
239:
240: /* get file descriptors from the transfers */
241: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
242:
243: if(mc != CURLM_OK) {
244: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
245: break;
246: }
247:
248: /* On success the value of maxfd is guaranteed to be >= -1. We call
249: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
250: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
251: to sleep 100ms, which is the minimum suggested value in the
252: curl_multi_fdset() doc. */
253:
254: if(maxfd == -1) {
255: #ifdef _WIN32
256: Sleep(100);
257: rc = 0;
258: #else
259: /* Portable sleep for platforms other than Windows. */
260: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
261: rc = select(0, NULL, NULL, NULL, &wait);
262: #endif
263: }
264: else {
265: /* Note that on some platforms 'timeout' may be modified by select().
266: If you need access to the original value save a copy beforehand. */
267: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
268: }
269:
270: switch(rc) {
271: case -1:
272: /* select error */
273: break;
274: case 0:
275: default:
276: /* timeout or readable/writable sockets */
277: curl_multi_perform(multi_handle, &still_running);
278: break;
279: }
280: }
281:
282: for(i = 0; i < num_transfers; i++) {
283: curl_multi_remove_handle(multi_handle, trans[i].easy);
284: curl_easy_cleanup(trans[i].easy);
285: }
286:
287: curl_multi_cleanup(multi_handle);
288:
289: return 0;
290: }
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