213 строки
5.6 KiB
C
213 строки
5.6 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* Example application code using the multi socket interface to download
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multiple files at once, but instead of using curl_multi_perform and
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curl_multi_wait, which uses select(), we use libuv.
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It supports epoll, kqueue, etc. on unixes and fast IO completion ports on
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Windows, which means, it should be very fast on all platforms..
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Written by Clemens Gruber, based on an outdated example from uvbook and
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some tests from libuv.
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Requires libuv and (of course) libcurl.
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See http://nikhilm.github.com/uvbook/ for more information on libuv.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <uv.h>
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#include <curl/curl.h>
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uv_loop_t *loop;
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CURLM *curl_handle;
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uv_timer_t timeout;
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typedef struct curl_context_s {
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uv_poll_t poll_handle;
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curl_socket_t sockfd;
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} curl_context_t;
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curl_context_t* create_curl_context(curl_socket_t sockfd)
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{
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curl_context_t *context;
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context = (curl_context_t *) malloc(sizeof *context);
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context->sockfd = sockfd;
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uv_poll_init_socket(loop, &context->poll_handle, sockfd);
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context->poll_handle.data = context;
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return context;
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}
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void curl_close_cb(uv_handle_t *handle)
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{
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curl_context_t* context = (curl_context_t*) handle->data;
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free(context);
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}
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void destroy_curl_context(curl_context_t *context)
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{
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uv_close((uv_handle_t*) &context->poll_handle, curl_close_cb);
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}
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void add_download(const char *url, int num)
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{
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char filename[50];
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FILE *file;
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CURL *handle;
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sprintf(filename, "%d.download", num);
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file = fopen(filename, "w");
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if (file == NULL) {
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fprintf(stderr, "Error opening %s\n", filename);
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return;
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}
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handle = curl_easy_init();
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curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
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curl_easy_setopt(handle, CURLOPT_URL, url);
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curl_multi_add_handle(curl_handle, handle);
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fprintf(stderr, "Added download %s -> %s\n", url, filename);
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}
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void curl_perform(uv_poll_t *req, int status, int events)
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{
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int running_handles;
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int flags = 0;
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curl_context_t *context;
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char *done_url;
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CURLMsg *message;
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int pending;
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uv_timer_stop(&timeout);
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if (events & UV_READABLE)
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flags |= CURL_CSELECT_IN;
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if (events & UV_WRITABLE)
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flags |= CURL_CSELECT_OUT;
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context = (curl_context_t*)req;
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curl_multi_socket_action(curl_handle, context->sockfd, flags,
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&running_handles);
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while ((message = curl_multi_info_read(curl_handle, &pending))) {
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switch (message->msg) {
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case CURLMSG_DONE:
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curl_easy_getinfo(message->easy_handle, CURLINFO_EFFECTIVE_URL,
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&done_url);
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printf("%s DONE\n", done_url);
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curl_multi_remove_handle(curl_handle, message->easy_handle);
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curl_easy_cleanup(message->easy_handle);
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break;
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default:
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fprintf(stderr, "CURLMSG default\n");
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abort();
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}
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}
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}
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void on_timeout(uv_timer_t *req, int status)
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{
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int running_handles;
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curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
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&running_handles);
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}
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void start_timeout(CURLM *multi, long timeout_ms, void *userp)
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{
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if (timeout_ms <= 0)
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timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it in
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a bit */
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uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
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}
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int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
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void *socketp)
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{
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curl_context_t *curl_context;
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if (action == CURL_POLL_IN || action == CURL_POLL_OUT) {
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if (socketp) {
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curl_context = (curl_context_t*) socketp;
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}
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else {
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curl_context = create_curl_context(s);
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}
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curl_multi_assign(curl_handle, s, (void *) curl_context);
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}
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switch (action) {
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case CURL_POLL_IN:
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uv_poll_start(&curl_context->poll_handle, UV_READABLE, curl_perform);
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break;
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case CURL_POLL_OUT:
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uv_poll_start(&curl_context->poll_handle, UV_WRITABLE, curl_perform);
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break;
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case CURL_POLL_REMOVE:
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if (socketp) {
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uv_poll_stop(&((curl_context_t*)socketp)->poll_handle);
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destroy_curl_context((curl_context_t*) socketp);
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curl_multi_assign(curl_handle, s, NULL);
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}
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break;
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default:
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abort();
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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loop = uv_default_loop();
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if (argc <= 1)
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return 0;
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if (curl_global_init(CURL_GLOBAL_ALL)) {
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fprintf(stderr, "Could not init cURL\n");
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return 1;
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}
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uv_timer_init(loop, &timeout);
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curl_handle = curl_multi_init();
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curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
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curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);
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while (argc-- > 1) {
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add_download(argv[argc], argc);
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}
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uv_run(loop, UV_RUN_DEFAULT);
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curl_multi_cleanup(curl_handle);
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return 0;
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}
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