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Learning_GTK4_tree/gdk/broadway/broadwayd.c

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#include "config.h"
#include <string.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <locale.h>
#include <errno.h>
#include <glib.h>
#include <gio/gio.h>
#ifdef G_OS_UNIX
#include <gio/gunixsocketaddress.h>
#include <gio/gunixfdmessage.h>
#endif
#include "broadway-server.h"
BroadwayServer *server;
GList *clients;
static guint32 client_id_count = 1;
/* Serials:
*
* Broadway tracks serials for all clients primarily to get the right behaviour wrt
* grabs. Each request the client sends gets an increasing per-client serial number, starting
* at 1. Thus, the client can now when a mouse event is seen whether the mouse event was
* sent before or after the server saw the grab request from the client (as this affects how
* the event is handled).
*
* There is only a single stream of increasing serials sent from the daemon to the web browser
* though, called "daemon serials", so we need to map back from the daemon serials to the client
* serials when we send an event to a client. So, each client keeps track of the mappings
* between its serials and daemon serials for any outstanding requests.
*
* There is some additional complexity in that there may be multiple consecutive web browser
* sessions, so we need to keep track of the last daemon serial used in between each web client
* connection so that the daemon serials can be strictly increasing.
*/
typedef struct {
guint32 client_serial;
guint32 daemon_serial;
} BroadwaySerialMapping;
typedef struct {
guint32 id;
GSocketConnection *connection;
GInputStream *in;
GString *buffer;
GSource *source;
GSList *serial_mappings;
GList *surfaces;
guint disconnect_idle;
GList *fds;
GHashTable *textures;
} BroadwayClient;
static void
close_fd (void *data)
{
close (GPOINTER_TO_INT (data));
}
static void
client_free (BroadwayClient *client)
{
g_assert (client->surfaces == NULL);
g_assert (client->disconnect_idle == 0);
clients = g_list_remove (clients, client);
g_object_unref (client->connection);
g_object_unref (client->in);
g_string_free (client->buffer, TRUE);
g_slist_free_full (client->serial_mappings, g_free);
g_list_free_full (client->fds, close_fd);
g_hash_table_destroy (client->textures);
g_free (client);
}
static void
client_disconnected (BroadwayClient *client)
{
GHashTableIter iter;
gpointer key, value;
GList *l;
if (client->disconnect_idle != 0)
{
g_source_remove (client->disconnect_idle);
client->disconnect_idle = 0;
}
if (client->source != 0)
{
g_source_destroy (client->source);
client->source = 0;
}
for (l = client->surfaces; l != NULL; l = l->next)
broadway_server_destroy_surface (server, GPOINTER_TO_UINT (l->data), TRUE);
g_list_free (client->surfaces);
client->surfaces = NULL;
g_hash_table_iter_init (&iter, client->textures);
while (g_hash_table_iter_next (&iter, &key, &value))
broadway_server_release_texture (server, GPOINTER_TO_INT (value));
broadway_server_flush (server);
client_free (client);
}
static gboolean
disconnect_idle_cb (BroadwayClient *client)
{
client->disconnect_idle = 0;
client_disconnected (client);
return G_SOURCE_REMOVE;
}
static void
client_disconnect_in_idle (BroadwayClient *client)
{
if (client->disconnect_idle == 0)
client->disconnect_idle =
g_idle_add_full (G_PRIORITY_DEFAULT, (GSourceFunc)disconnect_idle_cb, client, NULL);
}
static void
send_reply (BroadwayClient *client,
BroadwayRequest *request,
BroadwayReply *reply,
gsize size,
guint32 type)
{
GOutputStream *output;
reply->base.size = size;
reply->base.in_reply_to = request ? request->base.serial : 0;
reply->base.type = type;
output = g_io_stream_get_output_stream (G_IO_STREAM (client->connection));
if (!g_output_stream_write_all (output, reply, size, NULL, NULL, NULL))
{
g_printerr ("can't write to client");
client_disconnect_in_idle (client);
}
}
static void
add_client_serial_mapping (BroadwayClient *client,
guint32 client_serial,
guint32 daemon_serial)
{
BroadwaySerialMapping *map;
GSList *last;
last = g_slist_last (client->serial_mappings);
if (last != NULL)
{
map = last->data;
/* If we have no web client, don't grow forever */
if (map->daemon_serial == daemon_serial)
{
map->client_serial = client_serial;
return;
}
}
map = g_new0 (BroadwaySerialMapping, 1);
map->client_serial = client_serial;
map->daemon_serial = daemon_serial;
client->serial_mappings = g_slist_append (client->serial_mappings, map);
}
/* Returns the latest seen client serial at the time we sent
a daemon request to the browser with a specific daemon serial */
static guint32
get_client_serial (BroadwayClient *client, guint32 daemon_serial)
{
BroadwaySerialMapping *map;
GSList *l, *found;
guint32 client_serial = 0;
found = NULL;
for (l = client->serial_mappings; l != NULL; l = l->next)
{
map = l->data;
if (map->daemon_serial <= daemon_serial)
{
found = l;
client_serial = map->client_serial;
}
else
break;
}
/* Remove mappings before the found one, they will never more be used */
while (found != NULL &&
client->serial_mappings != found)
{
g_free (client->serial_mappings->data);
client->serial_mappings =
g_slist_delete_link (client->serial_mappings, client->serial_mappings);
}
return client_serial;
}
static void
client_handle_request (BroadwayClient *client,
BroadwayRequest *request)
{
BroadwayReply reply;
guint32 before_serial, now_serial;
guint32 global_id;
int fd;
before_serial = broadway_server_get_next_serial (server);
switch (request->base.type)
{
case BROADWAY_REQUEST_NEW_SURFACE:
reply.new_surface.id =
broadway_server_new_surface (server, client->id,
request->new_surface.x,
request->new_surface.y,
request->new_surface.width,
request->new_surface.height);
client->surfaces =
g_list_prepend (client->surfaces,
GUINT_TO_POINTER (reply.new_surface.id));
send_reply (client, request, &reply, sizeof (reply.new_surface),
BROADWAY_REPLY_NEW_SURFACE);
break;
case BROADWAY_REQUEST_FLUSH:
broadway_server_flush (server);
break;
case BROADWAY_REQUEST_SYNC:
broadway_server_flush (server);
send_reply (client, request, &reply, sizeof (reply.sync),
BROADWAY_REPLY_SYNC);
break;
case BROADWAY_REQUEST_ROUNDTRIP:
broadway_server_roundtrip (server,
request->roundtrip.id,
request->roundtrip.tag);
break;
case BROADWAY_REQUEST_QUERY_MOUSE:
broadway_server_query_mouse (server,
&reply.query_mouse.surface,
&reply.query_mouse.root_x,
&reply.query_mouse.root_y,
&reply.query_mouse.mask);
send_reply (client, request, &reply, sizeof (reply.query_mouse),
BROADWAY_REPLY_QUERY_MOUSE);
break;
case BROADWAY_REQUEST_DESTROY_SURFACE:
client->surfaces =
g_list_remove (client->surfaces,
GUINT_TO_POINTER (request->destroy_surface.id));
broadway_server_destroy_surface (server, request->destroy_surface.id, FALSE);
break;
case BROADWAY_REQUEST_SHOW_SURFACE:
broadway_server_surface_show (server, request->show_surface.id);
break;
case BROADWAY_REQUEST_HIDE_SURFACE:
broadway_server_surface_hide (server, request->hide_surface.id);
break;
case BROADWAY_REQUEST_SET_TRANSIENT_FOR:
broadway_server_surface_set_transient_for (server,
request->set_transient_for.id,
request->set_transient_for.parent);
break;
case BROADWAY_REQUEST_SET_NODES:
{
gsize array_size = request->base.size - sizeof (BroadwayRequestSetNodes) + sizeof(guint32);
int n_data = array_size / sizeof(guint32);
broadway_server_surface_update_nodes (server, request->set_nodes.id,
request->set_nodes.data, n_data,
client->textures);
}
break;
case BROADWAY_REQUEST_UPLOAD_TEXTURE:
if (client->fds == NULL)
g_warning ("FD passing mismatch for texture upload %d", request->release_texture.id);
else
{
char *data, *p;
gsize to_read;
gssize num_read;
GBytes *texture;
fd = GPOINTER_TO_INT (client->fds->data);
client->fds = g_list_delete_link (client->fds, client->fds);
data = g_malloc (request->upload_texture.size);
to_read = request->upload_texture.size;
lseek (fd, request->upload_texture.offset, SEEK_SET);
p = data;
do
{
num_read = read (fd, p, to_read);
if (num_read == -1 && errno == EAGAIN)
continue;
if (num_read > 0)
{
p += num_read;
to_read -= num_read;
}
else
{
g_warning ("Unexpected short read of texture");
break;
}
}
while (to_read > 0);
close (fd);
texture = g_bytes_new_take (data, request->upload_texture.size);
global_id = broadway_server_upload_texture (server, texture);
g_bytes_unref (texture);
g_hash_table_replace (client->textures,
GINT_TO_POINTER (request->release_texture.id),
GINT_TO_POINTER (global_id));
}
break;
case BROADWAY_REQUEST_RELEASE_TEXTURE:
global_id = GPOINTER_TO_INT (g_hash_table_lookup (client->textures,
GINT_TO_POINTER (request->release_texture.id)));
if (global_id != 0)
broadway_server_release_texture (server, global_id);
g_hash_table_remove (client->textures,
GINT_TO_POINTER (request->release_texture.id));
break;
case BROADWAY_REQUEST_MOVE_RESIZE:
broadway_server_surface_move_resize (server,
request->move_resize.id,
request->move_resize.with_move,
request->move_resize.x,
request->move_resize.y,
request->move_resize.width,
request->move_resize.height);
break;
case BROADWAY_REQUEST_GRAB_POINTER:
reply.grab_pointer.status =
broadway_server_grab_pointer (server,
client->id,
request->grab_pointer.id,
request->grab_pointer.owner_events,
request->grab_pointer.event_mask,
request->grab_pointer.time_);
send_reply (client, request, &reply, sizeof (reply.grab_pointer),
BROADWAY_REPLY_GRAB_POINTER);
break;
case BROADWAY_REQUEST_UNGRAB_POINTER:
reply.ungrab_pointer.status =
broadway_server_ungrab_pointer (server,
request->ungrab_pointer.time_);
send_reply (client, request, &reply, sizeof (reply.ungrab_pointer),
BROADWAY_REPLY_UNGRAB_POINTER);
break;
case BROADWAY_REQUEST_FOCUS_SURFACE:
broadway_server_focus_surface (server, request->focus_surface.id);
break;
case BROADWAY_REQUEST_SET_SHOW_KEYBOARD:
broadway_server_set_show_keyboard (server, request->set_show_keyboard.show_keyboard);
break;
case BROADWAY_REQUEST_SET_MODAL_HINT:
broadway_server_surface_set_modal_hint (server,
request->set_modal_hint.id,
request->set_modal_hint.modal_hint);
break;
default:
g_warning ("Unknown request of type %d", request->base.type);
}
now_serial = broadway_server_get_next_serial (server);
/* If we sent a new output request, map that this client serial to that, otherwise
update old mapping for previously sent daemon serial */
if (now_serial != before_serial)
add_client_serial_mapping (client,
request->base.serial,
before_serial);
else
add_client_serial_mapping (client,
request->base.serial,
before_serial - 1);
}
#define INPUT_BUFFER_SIZE 8192
static gboolean
client_input_cb (GPollableInputStream *stream,
gpointer user_data)
{
BroadwayClient *client = user_data;
GSocket *socket = g_socket_connection_get_socket (client->connection);
gssize res;
gsize old_len;
guchar *buffer;
gsize buffer_len;
GInputVector input_vector;
GSocketControlMessage **messages = NULL;
int i, num_messages;
old_len = client->buffer->len;
/* Ensure we have at least INPUT_BUFFER_SIZE extra space */
g_string_set_size (client->buffer, old_len + INPUT_BUFFER_SIZE);
g_string_set_size (client->buffer, old_len);
input_vector.buffer = client->buffer->str + old_len;
input_vector.size = client->buffer->allocated_len - client->buffer->len -1;
res = g_socket_receive_message (socket, NULL,
&input_vector, 1,
&messages, &num_messages,
NULL, NULL, NULL);
if (res <= 0)
{
client->source = NULL;
client_disconnected (client);
return G_SOURCE_REMOVE;
}
for (i = 0; i < num_messages; i++)
{
if (G_IS_UNIX_FD_MESSAGE (messages[i]))
{
int j, n_fds;
int *fds = g_unix_fd_message_steal_fds (G_UNIX_FD_MESSAGE (messages[i]), &n_fds);
for (j = 0; j < n_fds; j++)
{
int fd = fds[i];
client->fds = g_list_append (client->fds, GINT_TO_POINTER (fd));
}
g_free (fds);
}
g_object_unref (messages[i]);
}
g_free (messages);
g_string_set_size (client->buffer, old_len + res);
buffer = (guchar *)client->buffer->str;
buffer_len = client->buffer->len;
while (buffer_len >= sizeof (guint32))
{
guint32 size;
memcpy (&size, buffer, sizeof (guint32));
if (size <= buffer_len)
{
client_handle_request (client, (BroadwayRequest *)buffer);
buffer_len -= size;
buffer += size;
}
else
break;
}
g_string_erase (client->buffer, 0, client->buffer->len - buffer_len);
return G_SOURCE_CONTINUE;
}
static gboolean
incoming_client (GSocketService *service,
GSocketConnection *connection,
GObject *source_object)
{
BroadwayClient *client;
GInputStream *input;
BroadwayInputMsg ev = { {0} };
client = g_new0 (BroadwayClient, 1);
client->id = client_id_count++;
client->connection = g_object_ref (connection);
client->textures = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, NULL);
input = g_io_stream_get_input_stream (G_IO_STREAM (client->connection));
client->in = input;
client->buffer = g_string_sized_new (INPUT_BUFFER_SIZE);
client->source = g_pollable_input_stream_create_source (G_POLLABLE_INPUT_STREAM (input), NULL);
g_source_set_callback (client->source, (GSourceFunc) client_input_cb, client, NULL);
g_source_attach (client->source, NULL);
clients = g_list_prepend (clients, client);
/* Send initial resize notify */
ev.base.type = BROADWAY_EVENT_SCREEN_SIZE_CHANGED;
ev.base.serial = broadway_server_get_next_serial (server) - 1;
ev.base.time = broadway_server_get_last_seen_time (server);
broadway_server_get_screen_size (server,
&ev.screen_resize_notify.width,
&ev.screen_resize_notify.height,
&ev.screen_resize_notify.scale);
broadway_events_got_input (&ev,
client->id);
return TRUE;
}
int
main (int argc, char *argv[])
{
GError *error = NULL;
GOptionContext *context;
GMainLoop *loop;
GSocketAddress *address;
GSocketService *listener;
char *http_address = NULL;
char *unixsocket_address = NULL;
int http_port = 0;
char *ssl_cert = NULL;
char *ssl_key = NULL;
const char *display;
int port = 0;
const GOptionEntry entries[] = {
{ "port", 'p', 0, G_OPTION_ARG_INT, &http_port, "Httpd port", "PORT" },
{ "address", 'a', 0, G_OPTION_ARG_STRING, &http_address, "Ip address to bind to ", "ADDRESS" },
#ifdef G_OS_UNIX
{ "unixsocket", 'u', 0, G_OPTION_ARG_STRING, &unixsocket_address, "Unix domain socket address", "ADDRESS" },
#endif
{ "cert", 'c', 0, G_OPTION_ARG_STRING, &ssl_cert, "SSL certificate path", "PATH" },
{ "key", 'k', 0, G_OPTION_ARG_STRING, &ssl_key, "SSL key path", "PATH" },
{ NULL }
};
setlocale (LC_ALL, "");
context = g_option_context_new ("[:DISPLAY] - broadway display daemon");
g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
if (!g_option_context_parse (context, &argc, &argv, &error))
{
g_printerr ("option parsing failed: %s\n", error->message);
exit (1);
}
display = NULL;
if (argc > 1)
{
if (*argv[1] != ':')
{
g_printerr ("Usage gtk4-broadwayd [:DISPLAY]\n");
exit (1);
}
display = argv[1];
}
if (display == NULL)
display = ":0";
if (display[0] == ':' && g_ascii_isdigit(display[1]))
{
char *path, *basename;
port = strtol (display + strlen (":"), NULL, 10);
basename = g_strdup_printf ("broadway%d.socket", port + 1);
path = g_build_filename (g_get_user_runtime_dir (), basename, NULL);
g_free (basename);
unlink (path);
g_print ("Listening on %s\n", path);
address = g_unix_socket_address_new_with_type (path, -1,
G_UNIX_SOCKET_ADDRESS_PATH);
g_free (path);
}
else
{
g_printerr ("Failed to parse display %s\n", display);
exit (1);
}
if (http_port == 0)
http_port = 8080 + port;
if (unixsocket_address != NULL)
server = broadway_server_on_unix_socket_new (unixsocket_address, &error);
else
server = broadway_server_new (http_address,
http_port,
ssl_cert,
ssl_key,
&error);
if (server == NULL)
{
g_printerr ("%s\n", error->message);
return 1;
}
listener = g_socket_service_new ();
if (!g_socket_listener_add_address (G_SOCKET_LISTENER (listener),
address,
G_SOCKET_TYPE_STREAM,
G_SOCKET_PROTOCOL_DEFAULT,
G_OBJECT (server),
NULL,
&error))
{
g_printerr ("Can't listen: %s\n", error->message);
return 1;
}
g_object_unref (address);
g_signal_connect (listener, "incoming", G_CALLBACK (incoming_client), NULL);
g_socket_service_start (G_SOCKET_SERVICE (listener));
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
return 0;
}
static gsize
get_event_size (int type)
{
switch (type)
{
case BROADWAY_EVENT_ENTER:
case BROADWAY_EVENT_LEAVE:
return sizeof (BroadwayInputCrossingMsg);
case BROADWAY_EVENT_POINTER_MOVE:
return sizeof (BroadwayInputPointerMsg);
case BROADWAY_EVENT_BUTTON_PRESS:
case BROADWAY_EVENT_BUTTON_RELEASE:
return sizeof (BroadwayInputButtonMsg);
case BROADWAY_EVENT_SCROLL:
return sizeof (BroadwayInputScrollMsg);
case BROADWAY_EVENT_TOUCH:
return sizeof (BroadwayInputTouchMsg);
case BROADWAY_EVENT_KEY_PRESS:
case BROADWAY_EVENT_KEY_RELEASE:
return sizeof (BroadwayInputKeyMsg);
case BROADWAY_EVENT_GRAB_NOTIFY:
case BROADWAY_EVENT_UNGRAB_NOTIFY:
return sizeof (BroadwayInputGrabReply);
case BROADWAY_EVENT_CONFIGURE_NOTIFY:
return sizeof (BroadwayInputConfigureNotify);
case BROADWAY_EVENT_ROUNDTRIP_NOTIFY:
return sizeof (BroadwayInputRoundtripNotify);
case BROADWAY_EVENT_SCREEN_SIZE_CHANGED:
return sizeof (BroadwayInputScreenResizeNotify);
case BROADWAY_EVENT_FOCUS:
return sizeof (BroadwayInputFocusMsg);
default:
g_assert_not_reached ();
}
return 0;
}
void
broadway_events_got_input (BroadwayInputMsg *message,
gint32 client_id)
{
GList *l;
BroadwayReplyEvent reply_event;
gsize size;
guint32 daemon_serial;
size = get_event_size (message->base.type);
g_assert (sizeof (BroadwayReplyBase) + size <= sizeof (BroadwayReplyEvent));
memset (&reply_event, 0, sizeof (BroadwayReplyEvent));
daemon_serial = message->base.serial;
memcpy (&reply_event.msg, message, size);
for (l = clients; l != NULL; l = l->next)
{
BroadwayClient *client = l->data;
if (client_id == -1 ||
client->id == client_id)
{
reply_event.msg.base.serial = get_client_serial (client, daemon_serial);
send_reply (client, NULL, (BroadwayReply *)&reply_event,
G_STRUCT_OFFSET (BroadwayReplyEvent, msg) + size,
BROADWAY_REPLY_EVENT);
}
}
}
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