aboutsummaryrefslogtreecommitdiffstats
path: root/src/state_file.c
blob: 14c76d73909a30bb717b8250c2423cf177789c0d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 * 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;

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 */;
}

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 */;
}

/**
 * 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)
{
	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(5 * 60 * 1000,
					     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);
}