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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include "gpollfilemonitor.h"
#include "gfile.h"
#include "gfilemonitor.h"
#include "gfileinfo.h"
static gboolean g_poll_file_monitor_cancel (GFileMonitor* monitor);
static void schedule_poll_timeout (GPollFileMonitor* poll_monitor);
struct _GPollFileMonitor
{
GFileMonitor parent_instance;
GFile *file;
GFileInfo *last_info;
GSource *timeout;
};
#define POLL_TIME_SECS 5
#define g_poll_file_monitor_get_type _g_poll_file_monitor_get_type
G_DEFINE_TYPE (GPollFileMonitor, g_poll_file_monitor, G_TYPE_FILE_MONITOR)
static void
g_poll_file_monitor_finalize (GObject* object)
{
GPollFileMonitor* poll_monitor;
poll_monitor = G_POLL_FILE_MONITOR (object);
g_poll_file_monitor_cancel (G_FILE_MONITOR (poll_monitor));
g_object_unref (poll_monitor->file);
g_clear_object (&poll_monitor->last_info);
G_OBJECT_CLASS (g_poll_file_monitor_parent_class)->finalize (object);
}
static void
g_poll_file_monitor_class_init (GPollFileMonitorClass* klass)
{
GObjectClass* gobject_class = G_OBJECT_CLASS (klass);
GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
gobject_class->finalize = g_poll_file_monitor_finalize;
file_monitor_class->cancel = g_poll_file_monitor_cancel;
}
static void
g_poll_file_monitor_init (GPollFileMonitor* poll_monitor)
{
}
static int
calc_event_type (GFileInfo *last,
GFileInfo *new)
{
if (last == NULL && new == NULL)
return -1;
if (last == NULL && new != NULL)
return G_FILE_MONITOR_EVENT_CREATED;
if (last != NULL && new == NULL)
return G_FILE_MONITOR_EVENT_DELETED;
if (g_file_info_has_attribute (last, G_FILE_ATTRIBUTE_ETAG_VALUE) &&
g_file_info_has_attribute (new, G_FILE_ATTRIBUTE_ETAG_VALUE) &&
g_strcmp0 (g_file_info_get_etag (last), g_file_info_get_etag (new)) != 0)
return G_FILE_MONITOR_EVENT_CHANGED;
if (g_file_info_has_attribute (last, G_FILE_ATTRIBUTE_STANDARD_SIZE) &&
g_file_info_has_attribute (new, G_FILE_ATTRIBUTE_STANDARD_SIZE) &&
g_file_info_get_size (last) != g_file_info_get_size (new))
return G_FILE_MONITOR_EVENT_CHANGED;
return -1;
}
static void
got_new_info (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GPollFileMonitor* poll_monitor = user_data;
GFileInfo *info;
int event;
info = g_file_query_info_finish (poll_monitor->file, res, NULL);
if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)))
{
event = calc_event_type (poll_monitor->last_info, info);
if (event != -1)
{
g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor),
poll_monitor->file,
NULL, event);
/* We're polling so slowly anyway, so always emit the done hint */
if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)) &&
(event == G_FILE_MONITOR_EVENT_CHANGED || event == G_FILE_MONITOR_EVENT_CREATED))
g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor),
poll_monitor->file,
NULL, G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT);
}
if (poll_monitor->last_info)
{
g_object_unref (poll_monitor->last_info);
poll_monitor->last_info = NULL;
}
if (info)
poll_monitor->last_info = g_object_ref (info);
schedule_poll_timeout (poll_monitor);
}
if (info)
g_object_unref (info);
g_object_unref (poll_monitor);
}
static gboolean
poll_file_timeout (gpointer data)
{
GPollFileMonitor* poll_monitor = data;
g_source_unref (poll_monitor->timeout);
poll_monitor->timeout = NULL;
g_file_query_info_async (poll_monitor->file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE,
0, 0, NULL, got_new_info, g_object_ref (poll_monitor));
return G_SOURCE_REMOVE;
}
static void
schedule_poll_timeout (GPollFileMonitor* poll_monitor)
{
poll_monitor->timeout = g_timeout_source_new_seconds (POLL_TIME_SECS);
g_source_set_callback (poll_monitor->timeout, poll_file_timeout, poll_monitor, NULL);
g_source_attach (poll_monitor->timeout, g_main_context_get_thread_default ());
}
static void
got_initial_info (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GPollFileMonitor* poll_monitor = user_data;
GFileInfo *info;
info = g_file_query_info_finish (poll_monitor->file, res, NULL);
poll_monitor->last_info = info;
if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)))
schedule_poll_timeout (poll_monitor);
g_object_unref (poll_monitor);
}
/**
* _g_poll_file_monitor_new:
* @file: a #GFile.
*
* Polls @file for changes.
*
* Returns: a new #GFileMonitor for the given #GFile.
**/
GFileMonitor*
_g_poll_file_monitor_new (GFile *file)
{
GPollFileMonitor* poll_monitor;
poll_monitor = g_object_new (G_TYPE_POLL_FILE_MONITOR, NULL);
poll_monitor->file = g_object_ref (file);
g_file_query_info_async (file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE,
0, 0, NULL, got_initial_info, g_object_ref (poll_monitor));
return G_FILE_MONITOR (poll_monitor);
}
static gboolean
g_poll_file_monitor_cancel (GFileMonitor* monitor)
{
GPollFileMonitor *poll_monitor = G_POLL_FILE_MONITOR (monitor);
if (poll_monitor->timeout)
{
g_source_destroy (poll_monitor->timeout);
g_source_unref (poll_monitor->timeout);
poll_monitor->timeout = NULL;
}
return TRUE;
}
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