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gp_dialog_download.c
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gp_dialog_download.c
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2023 Cyril Hrubis <[email protected]>
*/
#include <errno.h>
#include <string.h>
#include <curl/curl.h>
#include <widgets/gp_widgets.h>
#include "gp_dialog_download.h"
#include "dialog_download.json.h"
struct download_dialog {
CURL *easy;
CURLM *multi;
gp_dialog dialog;
gp_widget *progress;
};
#define DIALOG_OK 1
#define DIALOG_CANCEL 2
#define DIALOG_FAIL 3
#define DIALOG_WRITE 4
static int xferinfo(void *p,
curl_off_t dltotal, curl_off_t dlnow,
curl_off_t ultotal, curl_off_t ulnow)
{
if (!p)
return 0;
if (!dltotal)
return 0;
(void) ultotal;
(void) ulnow;
gp_widget_pbar_max_set(p, dltotal);
gp_widget_pbar_val_set(p, dlnow);
return 0;
}
static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
return written;
}
static int do_cancel(gp_widget_event *ev)
{
gp_dialog *dialog = ev->self->priv;
if (ev->type != GP_WIDGET_EVENT_WIDGET)
return 0;
dialog->retval = DIALOG_CANCEL;
return 0;
}
static const gp_widget_json_addr addrs[] = {
{.id = "cancel", .on_event = do_cancel},
{}
};
static const char *last_elem(const char *str)
{
size_t len = strlen(str);
while (len && str[len] != '/')
len--;
return str+len+1;
}
static gp_widget *load_download_layout(gp_dialog *dialog, const char *url, const char *dest_file, gp_widget **progress)
{
gp_widget *ret, *w;
gp_htable *uids = NULL;
gp_widget_json_callbacks callbacks = {
.default_priv = dialog,
.addrs = addrs,
};
ret = gp_dialog_layout_load("dialog_download", &callbacks, dialog_download, &uids);
if (!ret)
return NULL;
*progress = gp_widget_by_uid(uids, "progress", GP_WIDGET_PROGRESSBAR);
w = gp_widget_by_uid(uids, "filename", GP_WIDGET_LABEL);
if (w)
gp_widget_label_printf(w, "Saving %s to %s", last_elem(url), last_elem(dest_file));
gp_htable_free(uids);
return ret;
}
static void parse_curl_msg(struct download_dialog *download)
{
int running;
CURLMsg *message;
while ((message = curl_multi_info_read(download->multi, &running))) {
if (message->msg != CURLMSG_DONE)
continue;
if (message->data.result) {
gp_dialog_msg_printf_run(GP_DIALOG_MSG_ERR,
"Download failed",
"%s", curl_easy_strerror(message->data.result));
if (message->data.result == CURLE_WRITE_ERROR)
download->dialog.retval = DIALOG_WRITE;
else
download->dialog.retval = DIALOG_FAIL;
} else {
download->dialog.retval = DIALOG_OK;
}
}
}
static enum gp_poll_event_ret socket_data(gp_fd *self)
{
struct download_dialog *download = self->priv;
CURLMcode rc;
int running;
int flags = 0;
if (self->revents & GP_POLLIN)
flags |= CURL_CSELECT_IN;
if (self->revents & GP_POLLOUT)
flags |= CURL_CSELECT_OUT;
rc = curl_multi_socket_action(download->multi, self->fd, flags, &running);
parse_curl_msg(download);
return 0;
}
static int socket_cb(CURL *easy, curl_socket_t s, int action, void *userp, void *socketp)
{
int flags = 0;
gp_widget_poll_rem_by_fd(s);
switch (action) {
case CURL_POLL_IN:
flags = GP_POLLIN;
break;
case CURL_POLL_OUT:
flags = GP_POLLOUT;
break;
case CURL_POLL_INOUT:
flags = GP_POLLOUT | GP_POLLIN;
break;
case CURL_POLL_REMOVE:
default:
return 0;
}
gp_fd *new_fd = malloc(sizeof(gp_fd));
new_fd->fd = s;
new_fd->events = flags;
new_fd->event = socket_data;
new_fd->priv = userp;
gp_widget_poll_add(new_fd);
return 0;
}
static uint32_t timeout_cb(gp_timer *self)
{
CURLMcode rc;
int running;
struct download_dialog *download = self->priv;
rc = curl_multi_socket_action(download->multi, CURL_SOCKET_TIMEOUT, 0, &running);
printf(" multi_socket_action(TIMEOUT)! %i\n", rc);
parse_curl_msg(download);
return 0;
}
static int timer_cb(CURLM *multi, long timeout_ms, void *userp)
{
gp_timer *timer = userp;
if (timeout_ms < 0) {
gp_widgets_timer_rem(timer);
return 0;
}
if (timer->running)
gp_widgets_timer_rem(timer);
timer->expires = timeout_ms;
gp_widgets_timer_ins(timer);
return 0;
}
gp_dialog_download_res gp_dialog_download_run(const char *url, const char *dest_file)
{
FILE *dest;
struct download_dialog download = {};
gp_widget *progress;
int ret = 0;
if (curl_global_init(CURL_GLOBAL_ALL)) {
ret = GP_DIALOG_DOWNLOAD_ERR;
goto err0;
}
download.dialog.layout = load_download_layout(&download.dialog, url, dest_file, &progress);
if (!download.dialog.layout) {
ret = GP_DIALOG_DOWNLOAD_ERR;
goto err0;
}
dest = fopen(dest_file, "wb");
if (!dest) {
gp_dialog_msg_printf_run(GP_DIALOG_MSG_ERR,
"Failed to open file",
"%s: %s", dest_file, strerror(errno));
ret = GP_DIALOG_DOWNLOAD_ERR_OPEN;
goto err1;
}
download.easy = curl_easy_init();
download.multi = curl_multi_init();
if (!download.easy || !download.multi) {
ret = GP_DIALOG_DOWNLOAD_ERR;
goto err3;
}
gp_timer timeout_timer = {
.callback = timeout_cb,
.priv = &download,
.id = "CURL timeout",
};
/* Set callbacks to add socket to poll() and start a timer */
curl_multi_setopt(download.multi, CURLMOPT_SOCKETFUNCTION, socket_cb);
curl_multi_setopt(download.multi, CURLMOPT_SOCKETDATA, &download);
curl_multi_setopt(download.multi, CURLMOPT_TIMERFUNCTION, timer_cb);
curl_multi_setopt(download.multi, CURLMOPT_TIMERDATA, &timeout_timer);
/* sets URL */
curl_easy_setopt(download.easy, CURLOPT_URL, url);
/* enable progressbar */
curl_easy_setopt(download.easy, CURLOPT_XFERINFOFUNCTION, xferinfo);
curl_easy_setopt(download.easy, CURLOPT_XFERINFODATA, progress);
curl_easy_setopt(download.easy, CURLOPT_NOPROGRESS, 0L);
/* write to a file */
//curl_easy_setopt(download.easy, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(download.easy, CURLOPT_WRITEDATA, dest);
//BE VERBOSE
curl_easy_setopt(download.easy, CURLOPT_VERBOSE, 1L);
if (curl_multi_add_handle(download.multi, download.easy)) {
ret = GP_DIALOG_DOWNLOAD_ERR;
goto err3;
}
switch (gp_dialog_run(&download.dialog)) {
case DIALOG_OK:
break;
case DIALOG_FAIL:
ret = GP_DIALOG_DOWNLOAD_FAILED;
goto err4;
case DIALOG_CANCEL:
ret = GP_DIALOG_DOWNLOAD_CANCELED;
goto err4;
case DIALOG_WRITE:
ret = GP_DIALOG_DOWNLOAD_ERR_WRITE;
goto err4;
}
curl_multi_remove_handle(download.multi, download.easy);
curl_easy_cleanup(download.easy);
curl_multi_cleanup(download.multi);
curl_global_cleanup();
if (fclose(dest)) {
ret = GP_DIALOG_DOWNLOAD_ERR_WRITE;
goto err2;
}
gp_widget_free(download.dialog.layout);
return 0;
err4:
curl_multi_remove_handle(download.multi, download.easy);
err3:
curl_easy_cleanup(download.easy);
curl_multi_cleanup(download.multi);
curl_global_cleanup();
fclose(dest);
err2:
unlink(dest_file);
err1:
gp_widget_free(download.dialog.layout);
err0:
return ret;
}