Added libuv example multi-uv.c

1 files changed, 213 insertions, 0 deletions

diff --git a/docs/examples/multi-uv.c b/docs/examples/multi-uv.c
new file mode 100644
index 000000000..564be2d48
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+++ b/docs/examples/multi-uv.c
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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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+   Written by Clemens Gruber, based on an outdated example from uvbook and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;
+}