Annotation of embedaddon/curl/docs/examples/multi-uv.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
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4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2018, 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:
23: /* <DESC>
24: * multi_socket API using libuv
25: * </DESC>
26: */
27: /* Example application using the multi socket interface to download multiple
28: files in parallel, powered by libuv.
29:
30: Requires libuv and (of course) libcurl.
31:
32: See https://nikhilm.github.io/uvbook/ for more information on libuv.
33: */
34:
35: #include <stdio.h>
36: #include <stdlib.h>
37: #include <uv.h>
38: #include <curl/curl.h>
39:
40: uv_loop_t *loop;
41: CURLM *curl_handle;
42: uv_timer_t timeout;
43:
44: typedef struct curl_context_s {
45: uv_poll_t poll_handle;
46: curl_socket_t sockfd;
47: } curl_context_t;
48:
49: static curl_context_t* create_curl_context(curl_socket_t sockfd)
50: {
51: curl_context_t *context;
52:
53: context = (curl_context_t *) malloc(sizeof(*context));
54:
55: context->sockfd = sockfd;
56:
57: uv_poll_init_socket(loop, &context->poll_handle, sockfd);
58: context->poll_handle.data = context;
59:
60: return context;
61: }
62:
63: static void curl_close_cb(uv_handle_t *handle)
64: {
65: curl_context_t *context = (curl_context_t *) handle->data;
66: free(context);
67: }
68:
69: static void destroy_curl_context(curl_context_t *context)
70: {
71: uv_close((uv_handle_t *) &context->poll_handle, curl_close_cb);
72: }
73:
74: static void add_download(const char *url, int num)
75: {
76: char filename[50];
77: FILE *file;
78: CURL *handle;
79:
80: snprintf(filename, 50, "%d.download", num);
81:
82: file = fopen(filename, "wb");
83: if(!file) {
84: fprintf(stderr, "Error opening %s\n", filename);
85: return;
86: }
87:
88: handle = curl_easy_init();
89: curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
90: curl_easy_setopt(handle, CURLOPT_PRIVATE, file);
91: curl_easy_setopt(handle, CURLOPT_URL, url);
92: curl_multi_add_handle(curl_handle, handle);
93: fprintf(stderr, "Added download %s -> %s\n", url, filename);
94: }
95:
96: static void check_multi_info(void)
97: {
98: char *done_url;
99: CURLMsg *message;
100: int pending;
101: CURL *easy_handle;
102: FILE *file;
103:
104: while((message = curl_multi_info_read(curl_handle, &pending))) {
105: switch(message->msg) {
106: case CURLMSG_DONE:
107: /* Do not use message data after calling curl_multi_remove_handle() and
108: curl_easy_cleanup(). As per curl_multi_info_read() docs:
109: "WARNING: The data the returned pointer points to will not survive
110: calling curl_multi_cleanup, curl_multi_remove_handle or
111: curl_easy_cleanup." */
112: easy_handle = message->easy_handle;
113:
114: curl_easy_getinfo(easy_handle, CURLINFO_EFFECTIVE_URL, &done_url);
115: curl_easy_getinfo(easy_handle, CURLINFO_PRIVATE, &file);
116: printf("%s DONE\n", done_url);
117:
118: curl_multi_remove_handle(curl_handle, easy_handle);
119: curl_easy_cleanup(easy_handle);
120: if(file) {
121: fclose(file);
122: }
123: break;
124:
125: default:
126: fprintf(stderr, "CURLMSG default\n");
127: break;
128: }
129: }
130: }
131:
132: static void curl_perform(uv_poll_t *req, int status, int events)
133: {
134: int running_handles;
135: int flags = 0;
136: curl_context_t *context;
137:
138: if(events & UV_READABLE)
139: flags |= CURL_CSELECT_IN;
140: if(events & UV_WRITABLE)
141: flags |= CURL_CSELECT_OUT;
142:
143: context = (curl_context_t *) req->data;
144:
145: curl_multi_socket_action(curl_handle, context->sockfd, flags,
146: &running_handles);
147:
148: check_multi_info();
149: }
150:
151: static void on_timeout(uv_timer_t *req)
152: {
153: int running_handles;
154: curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
155: &running_handles);
156: check_multi_info();
157: }
158:
159: static int start_timeout(CURLM *multi, long timeout_ms, void *userp)
160: {
161: if(timeout_ms < 0) {
162: uv_timer_stop(&timeout);
163: }
164: else {
165: if(timeout_ms == 0)
166: timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it
167: in a bit */
168: uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
169: }
170: return 0;
171: }
172:
173: static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
174: void *socketp)
175: {
176: curl_context_t *curl_context;
177: int events = 0;
178:
179: switch(action) {
180: case CURL_POLL_IN:
181: case CURL_POLL_OUT:
182: case CURL_POLL_INOUT:
183: curl_context = socketp ?
184: (curl_context_t *) socketp : create_curl_context(s);
185:
186: curl_multi_assign(curl_handle, s, (void *) curl_context);
187:
188: if(action != CURL_POLL_IN)
189: events |= UV_WRITABLE;
190: if(action != CURL_POLL_OUT)
191: events |= UV_READABLE;
192:
193: uv_poll_start(&curl_context->poll_handle, events, curl_perform);
194: break;
195: case CURL_POLL_REMOVE:
196: if(socketp) {
197: uv_poll_stop(&((curl_context_t*)socketp)->poll_handle);
198: destroy_curl_context((curl_context_t*) socketp);
199: curl_multi_assign(curl_handle, s, NULL);
200: }
201: break;
202: default:
203: abort();
204: }
205:
206: return 0;
207: }
208:
209: int main(int argc, char **argv)
210: {
211: loop = uv_default_loop();
212:
213: if(argc <= 1)
214: return 0;
215:
216: if(curl_global_init(CURL_GLOBAL_ALL)) {
217: fprintf(stderr, "Could not init curl\n");
218: return 1;
219: }
220:
221: uv_timer_init(loop, &timeout);
222:
223: curl_handle = curl_multi_init();
224: curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
225: curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);
226:
227: while(argc-- > 1) {
228: add_download(argv[argc], argc);
229: }
230:
231: uv_run(loop, UV_RUN_DEFAULT);
232: curl_multi_cleanup(curl_handle);
233:
234: return 0;
235: }
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