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example/multi-uv: remove the use of globals
- shows how to pass on local variables (better) - start the transfers nicer (with curl_multi_socket_action) - consistent and helpful function naming - to better show what functions and callbacks that are used for what - build warning-free with gcc -W -Wall -pedantic Closes #14287
This commit is contained in:
Daniel Stenberg
parent
1565c02ab4
commit
b446802feb
@ -26,12 +26,12 @@
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* multi_socket API using libuv
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* </DESC>
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*/
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/* Example application using the multi socket interface to download multiple
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files in parallel, powered by libuv.
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/* Use the socket_action interface to download multiple files in parallel,
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powered by libuv.
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Requires libuv and (of course) libcurl.
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See https://nikhilm.github.io/uvbook/ for more information on libuv.
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See https://docs.libuv.org/en/v1.x/index.html libuv API documentation
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*/
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#include <stdio.h>
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@ -39,24 +39,30 @@
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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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/* object to pass to the callbacks */
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struct datauv {
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uv_timer_t timeout;
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uv_loop_t *loop;
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CURLM *multi;
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};
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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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struct datauv *uv;
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} curl_context_t;
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static curl_context_t *create_curl_context(curl_socket_t sockfd)
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static curl_context_t *create_curl_context(curl_socket_t sockfd,
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struct datauv *uv)
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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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context->uv = uv;
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uv_poll_init_socket(loop, &context->poll_handle, sockfd);
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uv_poll_init_socket(uv->loop, &context->poll_handle, sockfd);
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context->poll_handle.data = context;
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return context;
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@ -73,7 +79,7 @@ static void destroy_curl_context(curl_context_t *context)
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uv_close((uv_handle_t *) &context->poll_handle, curl_close_cb);
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}
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static void add_download(const char *url, int num)
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static void add_download(const char *url, int num, CURLM *multi)
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{
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char filename[50];
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FILE *file;
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@ -91,11 +97,11 @@ static void add_download(const char *url, int num)
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curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
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curl_easy_setopt(handle, CURLOPT_PRIVATE, 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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curl_multi_add_handle(multi, handle);
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fprintf(stderr, "Added download %s -> %s\n", url, filename);
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}
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static void check_multi_info(void)
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static void check_multi_info(curl_context_t *context)
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{
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char *done_url;
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CURLMsg *message;
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@ -103,7 +109,7 @@ static void check_multi_info(void)
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CURL *easy_handle;
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FILE *file;
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while((message = curl_multi_info_read(curl_handle, &pending))) {
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while((message = curl_multi_info_read(context->uv->multi, &pending))) {
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switch(message->msg) {
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case CURLMSG_DONE:
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/* Do not use message data after calling curl_multi_remove_handle() and
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@ -117,7 +123,7 @@ static void check_multi_info(void)
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curl_easy_getinfo(easy_handle, CURLINFO_PRIVATE, &file);
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printf("%s DONE\n", done_url);
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curl_multi_remove_handle(curl_handle, easy_handle);
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curl_multi_remove_handle(context->uv->multi, easy_handle);
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curl_easy_cleanup(easy_handle);
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if(file) {
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fclose(file);
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@ -131,73 +137,82 @@ static void check_multi_info(void)
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}
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}
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static void curl_perform(uv_poll_t *req, int status, int events)
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/* callback from libuv on socket activity */
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static void on_uv_socket(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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curl_context_t *context = (curl_context_t *) req->data;
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(void)status;
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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->data;
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curl_multi_socket_action(curl_handle, context->sockfd, flags,
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curl_multi_socket_action(context->uv->multi, context->sockfd, flags,
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&running_handles);
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check_multi_info();
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check_multi_info(context);
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}
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static void on_timeout(uv_timer_t *req)
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/* callback from libuv when timeout expires */
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static void on_uv_timeout(uv_timer_t *req)
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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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check_multi_info();
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}
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static int 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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uv_timer_stop(&timeout);
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curl_context_t *context = (curl_context_t *) req->data;
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if(context) {
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int running_handles;
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curl_multi_socket_action(context->uv->multi, CURL_SOCKET_TIMEOUT, 0,
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&running_handles);
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check_multi_info(context);
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}
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}
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/* callback from libcurl to update the timeout expiry */
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static int cb_timeout(CURLM *multi, long timeout_ms,
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struct datauv *uv)
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{
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(void)multi;
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if(timeout_ms < 0)
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uv_timer_stop(&uv->timeout);
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else {
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if(timeout_ms == 0)
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timeout_ms = 1; /* 0 means call socket_action asap */
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uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
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timeout_ms = 1; /* 0 means call curl_multi_socket_action asap but NOT
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within the callback itself */
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uv_timer_start(&uv->timeout, on_uv_timeout, timeout_ms,
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0); /* do not repeat */
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}
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return 0;
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}
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static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
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void *socketp)
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/* callback from libcurl to update socket activity to wait for */
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static int cb_socket(CURL *easy, curl_socket_t s, int action,
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struct datauv *uv,
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void *socketp)
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{
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curl_context_t *curl_context;
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int events = 0;
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(void)easy;
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switch(action) {
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case CURL_POLL_IN:
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case CURL_POLL_OUT:
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case CURL_POLL_INOUT:
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curl_context = socketp ?
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(curl_context_t *) socketp : create_curl_context(s);
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(curl_context_t *) socketp : create_curl_context(s, uv);
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curl_multi_assign(curl_handle, s, (void *) curl_context);
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curl_multi_assign(uv->multi, s, (void *) curl_context);
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if(action != CURL_POLL_IN)
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events |= UV_WRITABLE;
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if(action != CURL_POLL_OUT)
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events |= UV_READABLE;
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uv_poll_start(&curl_context->poll_handle, events, curl_perform);
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uv_poll_start(&curl_context->poll_handle, events, on_uv_socket);
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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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curl_multi_assign(uv->multi, s, NULL);
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}
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break;
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default:
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@ -209,28 +224,31 @@ static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
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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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struct datauv uv = { 0 };
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int running_handles;
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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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curl_global_init(CURL_GLOBAL_ALL);
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uv_timer_init(loop, &timeout);
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uv.loop = uv_default_loop();
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uv_timer_init(uv.loop, &uv.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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uv.multi = curl_multi_init();
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curl_multi_setopt(uv.multi, CURLMOPT_SOCKETFUNCTION, cb_socket);
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curl_multi_setopt(uv.multi, CURLMOPT_SOCKETDATA, &uv);
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curl_multi_setopt(uv.multi, CURLMOPT_TIMERFUNCTION, cb_timeout);
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curl_multi_setopt(uv.multi, CURLMOPT_TIMERDATA, &uv);
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while(argc-- > 1) {
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add_download(argv[argc], argc);
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add_download(argv[argc], argc, uv.multi);
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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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/* kickstart the thing */
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curl_multi_socket_action(uv.multi, CURL_SOCKET_TIMEOUT, 0, &running_handles);
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uv_run(uv.loop, UV_RUN_DEFAULT);
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curl_multi_cleanup(uv.multi);
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return 0;
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}
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