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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "state_file.h"
#include "output_state.h"
#include "playlist.h"
#include "playlist_state.h"
#include "volume.h"
#include <glib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "state_file"
static char *state_file_path;
/** the GLib source id for the save timer */
static guint save_state_source_id;
/**
* These version numbers determine whether we need to save the state
* file. If nothing has changed, we won't let the hard drive spin up.
*/
static unsigned prev_volume_version, prev_output_version,
prev_playlist_version;
static void
state_file_write(void)
{
FILE *fp;
assert(state_file_path != NULL);
g_debug("Saving state file %s", state_file_path);
fp = fopen(state_file_path, "w");
if (G_UNLIKELY(!fp)) {
g_warning("failed to create %s: %s",
state_file_path, strerror(errno));
return;
}
save_sw_volume_state(fp);
audio_output_state_save(fp);
playlist_state_save(fp, &g_playlist);
while(fclose(fp) && errno == EINTR) /* nothing */;
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
static void
state_file_read(void)
{
FILE *fp;
char line[1024];
bool success;
assert(state_file_path != NULL);
g_debug("Loading state file %s", state_file_path);
fp = fopen(state_file_path, "r");
if (G_UNLIKELY(!fp)) {
g_warning("failed to open %s: %s",
state_file_path, strerror(errno));
return;
}
while (fgets(line, sizeof(line), fp) != NULL) {
g_strchomp(line);
success = read_sw_volume_state(line) ||
audio_output_state_read(line) ||
playlist_state_restore(line, fp, &g_playlist);
if (!success)
g_warning("Unrecognized line in state file: %s", line);
}
while(fclose(fp) && errno == EINTR) /* nothing */;
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist);
}
/**
* This function is called every 5 minutes by the GLib main loop, and
* saves the state file.
*/
static gboolean
timer_save_state_file(G_GNUC_UNUSED gpointer data)
{
if (prev_volume_version == sw_volume_state_get_hash() &&
prev_output_version == audio_output_state_get_version() &&
prev_playlist_version == playlist_state_get_hash(&g_playlist))
/* nothing has changed - don't save the state file,
don't spin up the hard disk */
return true;
state_file_write();
return true;
}
void
state_file_init(const char *path)
{
assert(state_file_path == NULL);
if (path == NULL)
return;
state_file_path = g_strdup(path);
state_file_read();
save_state_source_id = g_timeout_add_seconds(5 * 60,
timer_save_state_file,
NULL);
}
void
state_file_finish(void)
{
if (state_file_path == NULL)
/* no state file configured, no cleanup required */
return;
if (save_state_source_id != 0)
g_source_remove(save_state_source_id);
state_file_write();
g_free(state_file_path);
}
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