#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)
{
curl_context_t *context;
context = (curl_context_t *) malloc(sizeof *context);
context->sockfd = sockfd;
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;
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;
}