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Added libuv example multi-uv.c

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commit 142755fa5cdd2fea72c68663bfefeb9c6ccf5315 1 parent acafe9c
@clemensg clemensg authored committed
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3  docs/examples/Makefile.inc
@@ -12,4 +12,5 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
COMPLICATED_EXAMPLES = curlgtk.c curlx.c htmltitle.cpp cacertinmem.c \
ftpuploadresume.c ghiper.c hiperfifo.c htmltidy.c multithread.c \
opensslthreadlock.c sampleconv.c synctime.c threaded-ssl.c evhiperfifo.c \
- smooth-gtk-thread.c version-check.pl href_extractor.c asiohiper.cpp
+ smooth-gtk-thread.c version-check.pl href_extractor.c asiohiper.cpp \
+ multi-uv.c
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1  docs/examples/README
@@ -61,6 +61,7 @@ multi-debugcallback.c - a multi-interface app using the debug callback
multi-double.c - a multi-interface app doing two simultaneous transfers
multi-post.c - a multi-interface app doing a multipart formpost
multi-single.c - a multi-interface app getting a single file
+multi-uv.c - a multi-interface app using libuv
multithread.c - an example using multi-treading transferring multiple files
opensslthreadlock.c - show how to do locking when using OpenSSL multi-threaded
persistant.c - request two URLs with a persistent connection
View
213 docs/examples/multi-uv.c
@@ -0,0 +1,213 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+/* Example application code using the multi socket interface to download
+ multiple files at once, but instead of using curl_multi_perform and
+ curl_multi_wait, which uses select(), we use libuv.
+ It supports epoll, kqueue, etc. on unixes and fast IO completion ports on
+ Windows, which means, it should be very fast on all platforms..
+
+ Written by Clemens Gruber, based on an outdated example from uvbook and
+ some tests from libuv.
+
+ Requires libuv and (of course) libcurl.
+
+ See http://nikhilm.github.com/uvbook/ for more information on libuv.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <uv.h>
+#include <curl/curl.h>
+
+uv_loop_t *loop;
+CURLM *curl_handle;
+uv_timer_t timeout;
+
+typedef struct curl_context_s {
+ uv_poll_t poll_handle;
+ curl_socket_t sockfd;
+} curl_context_t;
+
+curl_context_t* create_curl_context(curl_socket_t sockfd)
+{
+ int r;
+ curl_context_t *context;
+
+ context = (curl_context_t *) malloc(sizeof *context);
+
+ context->sockfd = sockfd;
+
+ r = uv_poll_init_socket(loop, &context->poll_handle, sockfd);
+ context->poll_handle.data = context;
+
+ return context;
+}
+
+void curl_close_cb(uv_handle_t *handle)
+{
+ curl_context_t* context = (curl_context_t*) handle->data;
+ free(context);
+}
+
+void destroy_curl_context(curl_context_t *context)
+{
+ uv_close((uv_handle_t*) &context->poll_handle, curl_close_cb);
+}
+
+
+void add_download(const char *url, int num)
+{
+ char filename[50];
+ FILE *file;
+ CURL *handle;
+
+ sprintf(filename, "%d.download", num);
+
+ file = fopen(filename, "w");
+ if (file == NULL) {
+ fprintf(stderr, "Error opening %s\n", filename);
+ return;
+ }
+
+ handle = curl_easy_init();
+ curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
+ curl_easy_setopt(handle, CURLOPT_URL, url);
+ curl_multi_add_handle(curl_handle, handle);
+ fprintf(stderr, "Added download %s -> %s\n", url, filename);
+}
+
+void curl_perform(uv_poll_t *req, int status, int events)
+{
+ int running_handles;
+ int flags = 0;
+ curl_context_t *context;
+ char *done_url;
+ CURLMsg *message;
+ int pending;
+
+ uv_timer_stop(&timeout);
+
+ if (events & UV_READABLE)
+ flags |= CURL_CSELECT_IN;
+ if (events & UV_WRITABLE)
+ flags |= CURL_CSELECT_OUT;
+
+ context = (curl_context_t*)req;
+
+ curl_multi_socket_action(curl_handle, context->sockfd, flags,
+ &running_handles);
+
+ while ((message = curl_multi_info_read(curl_handle, &pending))) {
+ switch (message->msg) {
+ case CURLMSG_DONE:
+ curl_easy_getinfo(message->easy_handle, CURLINFO_EFFECTIVE_URL,
+ &done_url);
+ printf("%s DONE\n", done_url);
+
+ curl_multi_remove_handle(curl_handle, message->easy_handle);
+ curl_easy_cleanup(message->easy_handle);
+
+ break;
+ default:
+ fprintf(stderr, "CURLMSG default\n");
+ abort();
+ }
+ }
+}
+
+void on_timeout(uv_timer_t *req, int status)
+{
+ int running_handles;
+ curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
+ &running_handles);
+}
+
+void start_timeout(CURLM *multi, long timeout_ms, void *userp)
+{
+ if (timeout_ms <= 0)
+ timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it in
+ a bit */
+ uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
+}
+
+int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
+ void *socketp)
+{
+ curl_context_t *curl_context;
+ if (action == CURL_POLL_IN || action == CURL_POLL_OUT) {
+ if (socketp) {
+ curl_context = (curl_context_t*) socketp;
+ }
+ else {
+ curl_context = create_curl_context(s);
+ }
+ curl_multi_assign(curl_handle, s, (void *) curl_context);
+ }
+
+ switch (action) {
+ case CURL_POLL_IN:
+ uv_poll_start(&curl_context->poll_handle, UV_READABLE, curl_perform);
+ break;
+ case CURL_POLL_OUT:
+ uv_poll_start(&curl_context->poll_handle, UV_WRITABLE, curl_perform);
+ break;
+ case CURL_POLL_REMOVE:
+ if (socketp) {
+ uv_poll_stop(&((curl_context_t*)socketp)->poll_handle);
+ destroy_curl_context((curl_context_t*) socketp);
+ curl_multi_assign(curl_handle, s, NULL);
+ }
+ break;
+ default:
+ abort();
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ loop = uv_default_loop();
+
+ if (argc <= 1)
+ return 0;
+
+ if (curl_global_init(CURL_GLOBAL_ALL)) {
+ fprintf(stderr, "Could not init cURL\n");
+ return 1;
+ }
+
+ uv_timer_init(loop, &timeout);
+
+ curl_handle = curl_multi_init();
+ curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
+ curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);
+
+ while (argc-- > 1) {
+ add_download(argv[argc], argc);
+ }
+
+ uv_run(loop, UV_RUN_DEFAULT);
+ curl_multi_cleanup(curl_handle);
+ return 0;
+}
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