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/* tcp-echo.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 <libdex.h>
static DexScheduler *thread_pool;
static DexFuture *
socket_connection_fiber (gpointer user_data)
{
GSocketConnection *connection = user_data;
GOutputStream *output;
GInputStream *input;
GError *error = NULL;
guint8 buffer[1024];
g_assert (G_IS_SOCKET_CONNECTION (connection));
input = g_io_stream_get_input_stream (G_IO_STREAM (connection));
output = g_io_stream_get_output_stream (G_IO_STREAM (connection));
for (;;)
{
gssize n_read;
gssize to_write;
gssize n_written;
n_read = dex_await_int64 (dex_input_stream_read (input, buffer, sizeof buffer, G_PRIORITY_DEFAULT), &error);
if (n_read == 0 || error != NULL)
break;
for (to_write = n_read; to_write > 0; to_write -= n_written)
{
n_written = dex_await_int64 (dex_output_stream_write (output, &buffer[n_read-to_write], to_write, G_PRIORITY_HIGH), &error);
if (n_written == 0 || error != NULL)
break;
}
}
return error ? dex_future_new_for_error (error) : NULL;
}
static DexFuture *
socket_listener_fiber (gpointer user_data)
{
GSocketListener *socket_listener = user_data;
g_assert (G_IS_SOCKET_LISTENER (socket_listener));
for (;;)
{
g_autoptr(GSocketConnection) connection = NULL;
g_autoptr(DexFuture) fiber = NULL;
g_autoptr(GError) error = NULL;
/* Accept an incoming connection */
if (!(connection = dex_await_object (dex_socket_listener_accept (socket_listener), &error)))
return dex_future_new_for_error (g_steal_pointer (&error));
/* Spawn a fiber to handle connection on thread pool */
fiber = dex_scheduler_spawn (thread_pool, 0,
socket_connection_fiber,
g_steal_pointer (&connection),
g_object_unref);
}
return NULL;
}
static DexFuture *
quit_cb (DexFuture *completed,
gpointer user_data)
{
GMainLoop *main_loop = user_data;
g_main_loop_quit (main_loop);
return NULL;
}
int
main (int argc,
char *argv[])
{
g_autoptr(GSocketListener) socket_listener = NULL;
g_autoptr(GMainLoop) main_loop = NULL;
g_autoptr(DexFuture) future = NULL;
g_autoptr(GError) error = NULL;
guint port = 8080;
dex_init ();
main_loop = g_main_loop_new (NULL, FALSE);
thread_pool = dex_thread_pool_scheduler_new ();
socket_listener = g_socket_listener_new ();
/* Try to listen on configured port, or bail */
if (!g_socket_listener_add_inet_port (socket_listener, port, NULL, &error))
g_error ("Failed to listen on port %u: %s", port, error->message);
g_print ("Listening on 0.0.0.0:%u\n", port);
/* Spawn a fiber on current thread for socket loop */
future = dex_scheduler_spawn (NULL, 0,
socket_listener_fiber,
g_object_ref (socket_listener),
g_object_unref);
/* When it completes, call quit_cb to quit main loop */
future = dex_future_finally (future,
quit_cb,
g_main_loop_ref (main_loop),
(GDestroyNotify) g_main_loop_unref);
/* block on our main loop until quit_cb runs */
g_main_loop_run (main_loop);
return 0;
}
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