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/* wget.c
*
* Copyright 2022 Christian Hergert <chergert@redhat.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include <unistd.h>
#include <libsoup/soup.h>
#include <libdex.h>
#define PRIO G_PRIORITY_DEFAULT
static DexFuture *session_send (SoupSession *session,
SoupMessage *message,
int priority);
static char *output_document;
static char *url;
static GMainLoop *main_loop;
static int exit_code;
static const GOptionEntry entries[] = {
{ "output-document", 'o', 0,
G_OPTION_ARG_FILENAME, &output_document,
"write documents to FILE", "FILE" },
{ NULL }
};
static DexFuture *
wget (gpointer user_data)
{
g_autoptr(GOutputStream) output = NULL;
g_autoptr(GInputStream) input = NULL;
g_autoptr(SoupMessage) message = NULL;
g_autoptr(SoupSession) session = NULL;
g_autoptr(GError) error = NULL;
g_autoptr(GFile) file = NULL;
gssize len;
/* Create SoupSession used to manage connections */
session = soup_session_new_with_options ("user-agent", "libdex-wget",
"accept-language-auto", TRUE,
"timeout", 15,
NULL);
/* Create SoupMessage to submit request and get response */
if (!(message = soup_message_new ("GET", url)))
return dex_future_new_reject (G_URI_ERROR,
G_URI_ERROR_FAILED,
"Failed to parse url \"%s\"", url);
/* Suspend until we get a response or error */
if (!(input = dex_await_object (session_send (session, message, PRIO), &error)))
return dex_future_new_for_error (g_steal_pointer (&error));
/* If output_document is not specified, use the URI to guess a name */
if (output_document == NULL)
{
GUri *uri = soup_message_get_uri (message);
const char *path = g_uri_get_path (uri);
/* Try to get a reasonable name for the file */
output_document = path ? g_path_get_basename (path) : g_strdup ("output");
/* Avoid https://example.com/ having a filename of "/" */
if (output_document == NULL || output_document[0] == '/')
{
g_free (output_document);
output_document = g_strdup ("index.html");
}
}
/* Suspend while the file at @output_document is created or replaced */
file = g_file_new_for_path (output_document);
if (!(output = dex_await_object (dex_file_replace (file, NULL, TRUE, G_FILE_CREATE_REPLACE_DESTINATION, PRIO), &error)))
return dex_future_new_for_error (g_steal_pointer (&error));
/* Suspend while the input stream is spliced to our output stream */
len = dex_await_int64 (dex_output_stream_splice (output, input, 0, PRIO), &error);
if (error != NULL)
return dex_future_new_for_error (g_steal_pointer (&error));
/* Suspend while we wait for @output to close/sync */
if (!dex_await_boolean (dex_output_stream_close (output, PRIO), &error))
return dex_future_new_for_error (g_steal_pointer (&error));
/* Return the length copied back */
return dex_future_new_for_int64 (len);
}
static DexFuture *
fiber_completed (DexFuture *completed,
gpointer value)
{
GError *error = NULL;
gssize len;
/* We can "await" here because we know @completed is a resolved
* or rejected future. Otherwise, dex_await() only works on a fiber
* to be able to suspend execution until the result is ready.
*/
len = dex_await_int64 (dex_ref (completed), &error);
/* Give the user some information on success/failure */
if (error != NULL)
g_printerr ("error: %s\n", error->message);
else
g_printerr ("wrote %"G_GSSIZE_FORMAT" bytes to \"%s\".\n", len, output_document);
/* Set exit code for program and exit main loop */
exit_code = error != NULL ? EXIT_FAILURE : EXIT_SUCCESS;
g_main_loop_quit (main_loop);
return NULL;
}
int
main (int argc,
char *argv[])
{
GOptionContext *context;
DexFuture *future;
GError *error = NULL;
dex_init ();
context = g_option_context_new ("- a non-interactive network retriever");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &error))
{
g_printerr ("%s: %s\n", argv[0], error->message);
return EXIT_FAILURE;
}
if (argc != 2)
{
g_printerr ("usage: %s [OPTIONS...] URL\n", argv[0]);
return EXIT_FAILURE;
}
url = g_strdup (argv[1]);
main_loop = g_main_loop_new (NULL, FALSE);
/* Spawn a fiber */
future = dex_scheduler_spawn (NULL, 0, wget, NULL, NULL);
/* Handle resolve/reject of future and exit */
future = dex_future_finally (future, fiber_completed, NULL, NULL);
g_main_loop_run (main_loop);
dex_unref (future);
g_option_context_free (context);
g_main_loop_unref (main_loop);
g_free (output_document);
g_free (url);
return exit_code;
}
/* This is a GAsyncResult wrapper which converts it into a DexFuture.
* DexAsyncPair can be used for simple pairs currently, but lacks support
* for additional parameters. I hope to add that in the future though.
*/
static void
session_send_cb (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
DexAsyncPair *async_pair = user_data;
GInputStream *stream;
GError *error = NULL;
stream = soup_session_send_finish (SOUP_SESSION (object), result, &error);
if (error == NULL)
dex_async_pair_return_object (async_pair, stream);
else
dex_async_pair_return_error (async_pair, error);
dex_unref (async_pair);
}
static DexFuture *
session_send (SoupSession *session,
SoupMessage *message,
int priority)
{
DexAsyncPair *async_pair;
g_return_val_if_fail (SOUP_IS_SESSION (session), NULL);
g_return_val_if_fail (SOUP_IS_MESSAGE (message), NULL);
async_pair = (DexAsyncPair *)g_type_create_instance (DEX_TYPE_ASYNC_PAIR);
soup_session_send_async (session, message, priority,
dex_async_pair_get_cancellable (async_pair),
session_send_cb,
dex_ref (async_pair));
return DEX_FUTURE (async_pair);
}
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