conky/src/mpd.c

/* Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2005-2008 Brenden Matthews, Philip Kovacs, et. al.
 *	(see AUTHORS)
 * All rights reserved.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "conky.h"
#include "logging.h"
#include "timed_thread.h"
#include "libmpdclient.h"
#include "mpd.h"

/* server connection data */
static char mpd_host[128];
static char mpd_password[128];
static int mpd_port;

/* global mpd information */
static struct mpd_s mpd_info;

/* number of users of the above struct */
static int refcount = 0;

void mpd_set_host(const char *host)
{
	snprintf(mpd_host, 128, "%s", host);
}
void mpd_set_password(const char *password)
{
	snprintf(mpd_password, 128, "%s", password);
}
void mpd_clear_password(void)
{
	*mpd_password = '\0';
}
int mpd_set_port(const char *port)
{
	int val;

	val = strtol(port, 0, 0);
	if (val < 1 || val > 0xffff)
		return 1;
	mpd_port = val;
	return 0;
}

void init_mpd(void)
{
	if (!(refcount++))	/* first client */
		memset(&mpd_info, 0, sizeof(struct mpd_s));

	refcount++;
}

struct mpd_s *mpd_get_info(void)
{
	return &mpd_info;
}

static void clear_mpd(void)
{
#define xfree(x) if (x) free(x)
	xfree(mpd_info.title);
	xfree(mpd_info.artist);
	xfree(mpd_info.album);
	/* do not free() the const char *status! */
	/* do not free() the const char *random! */
	/* do not free() the const char *repeat! */
	xfree(mpd_info.track);
	xfree(mpd_info.name);
	xfree(mpd_info.file);
#undef xfree
	memset(&mpd_info, 0, sizeof(struct mpd_s));
}

void free_mpd(void)
{
	if (!(--refcount))	/* last client */
		clear_mpd();
}

static void *update_mpd_thread(void *) __attribute__((noreturn));

void update_mpd(void)
{
	int interval;
	static timed_thread *thread = NULL;

	if (thread)
		return;

	interval = info.music_player_interval * 1000000;
	thread = timed_thread_create(&update_mpd_thread, &thread, interval);
	if (!thread) {
		ERR("Failed to create MPD timed thread");
		return;
	}
	timed_thread_register(thread, &thread);
	if (timed_thread_run(thread))
		ERR("Failed to run MPD timed thread");
}

/* stringMAXdup dups at most text_buffer_size bytes */
#define strmdup(x) strndup(x, text_buffer_size - 1)

static void *update_mpd_thread(void *arg)
{
	static mpd_Connection *conn = NULL;
	mpd_Status *status;
	mpd_InfoEntity *entity;
	timed_thread *me = *(timed_thread **)arg;
	const char *emptystr = "";

	while (1) {
		if (!conn)
			conn = mpd_newConnection(mpd_host, mpd_port, 10);

		if (*mpd_password) {
			mpd_sendPasswordCommand(conn, mpd_password);
			mpd_finishCommand(conn);
		}

		timed_thread_lock(me);

		if (conn->error || conn == NULL) {
			ERR("MPD error: %s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			clear_mpd();

			mpd_info.status = "MPD not responding";
			timed_thread_unlock(me);
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}

		mpd_sendStatusCommand(conn);
		if ((status = mpd_getStatus(conn)) == NULL) {
			ERR("MPD error: %s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			clear_mpd();

			mpd_info.status = "MPD not responding";
			timed_thread_unlock(me);
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}
		mpd_finishCommand(conn);
		if (conn->error) {
			// fprintf(stderr, "%s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			timed_thread_unlock(me);
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}

		mpd_info.volume = status->volume;
		/* if (status->error) {
			printf("error: %s\n", status->error);
		} */

		switch(status->state) {
			case MPD_STATUS_STATE_PLAY:
				mpd_info.status = "Playing";
				break;
			case MPD_STATUS_STATE_STOP:
				mpd_info.status = "Stopped";
				break;
			case MPD_STATUS_STATE_PAUSE:
				mpd_info.status = "Paused";
				break;
			default:
				mpd_info.status = "";
				clear_mpd();
				break;
		}

		if (status->state == MPD_STATUS_STATE_PLAY ||
		    status->state == MPD_STATUS_STATE_PAUSE) {
			mpd_info.is_playing = 1;
			mpd_info.bitrate = status->bitRate;
			mpd_info.progress = (float) status->elapsedTime /
				status->totalTime;
			mpd_info.elapsed = status->elapsedTime;
			mpd_info.length = status->totalTime;
			if (status->random == 0) {
				mpd_info.random = "Off";
			} else if (status->random == 1) {
				mpd_info.random = "On";
			} else {
				mpd_info.random = "";
			}
			if (status->repeat == 0) {
				mpd_info.repeat = "Off";
			} else if (status->repeat == 1) {
				mpd_info.repeat = "On";
			} else {
				mpd_info.repeat = "";
			}
		}

		if (conn->error) {
			// fprintf(stderr, "%s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			timed_thread_unlock(me);
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}

		mpd_sendCurrentSongCommand(conn);
		while ((entity = mpd_getNextInfoEntity(conn))) {
			mpd_Song *song = entity->info.song;

			if (entity->type != MPD_INFO_ENTITY_TYPE_SONG) {
				mpd_freeInfoEntity(entity);
				continue;
			}
#define SONGSET(x) {                            \
	free(mpd_info.x);                       \
	if(song->x)                             \
		mpd_info.x = strmdup(song->x);  \
	else                                    \
		mpd_info.x = strmdup(emptystr); \
}
			SONGSET(artist);
			SONGSET(album);
			SONGSET(title);
			SONGSET(track);
			SONGSET(name);
			SONGSET(file);
#undef SONGSET
			if (entity != NULL) {
				mpd_freeInfoEntity(entity);
				entity = NULL;
			}
		}
		mpd_finishCommand(conn);
		if (conn->error) {
			// fprintf(stderr, "%s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			timed_thread_unlock(me);
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}

		timed_thread_unlock(me);
		if (conn->error) {
			// fprintf(stderr, "%s\n", conn->errorStr);
			mpd_closeConnection(conn);
			conn = 0;
			if (timed_thread_test(me, 0)) {
				timed_thread_exit(me);
			}
			continue;
		}

		mpd_freeStatus(status);
		/* if (conn) {
			mpd_closeConnection(conn);
			conn = 0;
		} */
		if (timed_thread_test(me, 0)) {
			timed_thread_exit(me);
		}
		continue;
	}
	/* never reached */
}