1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
24 * multi_socket API using libuv
27 /* Example application using the multi socket interface to download multiple
28 files in parallel, powered by libuv.
30 Requires libuv and (of course) libcurl.
32 See https://nikhilm.github.com/uvbook/ for more information on libuv.
38 #include <curl/curl.h>
44 typedef struct curl_context_s {
45 uv_poll_t poll_handle;
49 static curl_context_t* create_curl_context(curl_socket_t sockfd)
51 curl_context_t *context;
53 context = (curl_context_t *) malloc(sizeof *context);
55 context->sockfd = sockfd;
57 uv_poll_init_socket(loop, &context->poll_handle, sockfd);
58 context->poll_handle.data = context;
63 static void curl_close_cb(uv_handle_t *handle)
65 curl_context_t *context = (curl_context_t *) handle->data;
69 static void destroy_curl_context(curl_context_t *context)
71 uv_close((uv_handle_t *) &context->poll_handle, curl_close_cb);
74 static void add_download(const char *url, int num)
80 snprintf(filename, 50, "%d.download", num);
82 file = fopen(filename, "wb");
84 fprintf(stderr, "Error opening %s\n", filename);
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);
96 static void check_multi_info(void)
104 while((message = curl_multi_info_read(curl_handle, &pending))) {
105 switch(message->msg) {
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;
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);
118 curl_multi_remove_handle(curl_handle, easy_handle);
119 curl_easy_cleanup(easy_handle);
126 fprintf(stderr, "CURLMSG default\n");
132 static void curl_perform(uv_poll_t *req, int status, int events)
136 curl_context_t *context;
138 if(events & UV_READABLE)
139 flags |= CURL_CSELECT_IN;
140 if(events & UV_WRITABLE)
141 flags |= CURL_CSELECT_OUT;
143 context = (curl_context_t *) req->data;
145 curl_multi_socket_action(curl_handle, context->sockfd, flags,
151 static void on_timeout(uv_timer_t *req, int status)
154 curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
159 static int start_timeout(CURLM *multi, long timeout_ms, void *userp)
162 uv_timer_stop(&timeout);
166 timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it
168 uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
173 static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
176 curl_context_t *curl_context;
182 case CURL_POLL_INOUT:
183 curl_context = socketp ?
184 (curl_context_t *) socketp : create_curl_context(s);
186 curl_multi_assign(curl_handle, s, (void *) curl_context);
188 if(action != CURL_POLL_IN)
189 events |= UV_WRITABLE;
190 if(action != CURL_POLL_OUT)
191 events |= UV_READABLE;
193 uv_poll_start(&curl_context->poll_handle, events, curl_perform);
195 case CURL_POLL_REMOVE:
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);
209 int main(int argc, char **argv)
211 loop = uv_default_loop();
216 if(curl_global_init(CURL_GLOBAL_ALL)) {
217 fprintf(stderr, "Could not init curl\n");
221 uv_timer_init(loop, &timeout);
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);
228 add_download(argv[argc], argc);
231 uv_run(loop, UV_RUN_DEFAULT);
232 curl_multi_cleanup(curl_handle);