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/* ncmpc
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lyrics.h"
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <pthread.h>
static GPtrArray *plugins;
struct lyrics_loader {
char *artist, *title;
enum lyrics_loader_result result;
pthread_t thread;
pthread_mutex_t mutex;
pid_t pid;
int fd;
GString *data;
};
static int lyrics_register_plugin(const char *path0)
{
int ret;
struct stat st;
char *path;
ret = stat(path0, &st);
if (ret < 0)
return -1;
path = g_strdup(path0);
g_ptr_array_add(plugins, path);
return 0;
}
void lyrics_init(void)
{
plugins = g_ptr_array_new();
/* XXX configurable paths */
lyrics_register_plugin("./lyrics/hd.py");
lyrics_register_plugin("./lyrics/leoslyrics.py");
lyrics_register_plugin("./lyrics/lyricswiki.rb");
}
void lyrics_deinit(void)
{
guint i;
for (i = 0; i < plugins->len; ++i)
free(g_ptr_array_index(plugins, i));
g_ptr_array_free(plugins, TRUE);
}
static int
lyrics_start_plugin(struct lyrics_loader *loader, const char *plugin_path)
{
int ret, fds[2];
pid_t pid;
assert(loader != NULL);
assert(loader->result == LYRICS_BUSY);
assert(loader->pid < 0);
ret = pipe(fds);
if (ret < 0)
return -1;
pid = fork();
if (pid < 0) {
close(fds[0]);
close(fds[1]);
return -1;
}
if (pid == 0) {
dup2(fds[1], 1);
dup2(fds[1], 1);
close(fds[0]);
close(fds[1]);
close(0);
/* XXX close other fds? */
execl(plugin_path, plugin_path,
loader->artist, loader->title, NULL);
_exit(1);
}
close(fds[1]);
loader->pid = pid;
loader->fd = fds[0];
loader->data = g_string_new(NULL);
/* XXX CLOEXEC? */
return 0;
}
static int
lyrics_try_plugin(struct lyrics_loader *loader, const char *plugin_path)
{
int ret, status;
char buffer[256];
ssize_t nbytes;
assert(loader != NULL);
assert(loader->fd >= 0);
ret = lyrics_start_plugin(loader, plugin_path);
if (ret != 0)
return ret;
assert(loader->pid > 0);
while ((nbytes = read(loader->fd, buffer, sizeof(buffer))) > 0)
g_string_append_len(loader->data, buffer, nbytes);
ret = waitpid(loader->pid, &status, 0);
loader->pid = -1;
if (ret < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
g_string_free(loader->data, TRUE);
return -1;
}
return 0;
}
static void *
lyrics_thread(void *arg)
{
struct lyrics_loader *loader = arg;
guint next_plugin = 0;
int ret = -1;
while (next_plugin < plugins->len && ret != 0) {
const char *plugin_path = g_ptr_array_index(plugins,
next_plugin++);
ret = lyrics_try_plugin(loader, plugin_path);
assert(loader->pid < 0);
}
pthread_mutex_lock(&loader->mutex);
loader->result = ret == 0 ? LYRICS_SUCCESS : LYRICS_FAILED;
loader->thread = 0;
pthread_mutex_unlock(&loader->mutex);
return NULL;
}
struct lyrics_loader *
lyrics_load(const char *artist, const char *title)
{
struct lyrics_loader *loader = g_new(struct lyrics_loader, 1);
int ret;
assert(artist != NULL);
assert(title != NULL);
if (loader == NULL)
return NULL;
loader->artist = g_strdup(artist);
loader->title = g_strdup(title);
loader->result = LYRICS_BUSY;
loader->pid = -1;
pthread_mutex_init(&loader->mutex, NULL);
ret = pthread_create(&loader->thread, NULL, lyrics_thread, loader);
if (ret != 0) {
lyrics_free(loader);
return NULL;
}
return loader;
}
void
lyrics_free(struct lyrics_loader *loader)
{
pid_t pid = loader->pid;
pthread_t thread = loader->thread;
if (pid > 0)
kill(pid, SIGTERM);
if (loader->thread != 0)
pthread_join(thread, NULL);
assert(loader->pid < 0);
assert(loader->thread == 0);
if (loader->result == LYRICS_SUCCESS && loader->data != NULL)
g_string_free(loader->data, TRUE);
}
enum lyrics_loader_result
lyrics_result(struct lyrics_loader *loader)
{
return loader->result;
}
const GString *
lyrics_get(struct lyrics_loader *loader)
{
/* sync with thread */
pthread_mutex_lock(&loader->mutex);
pthread_mutex_unlock(&loader->mutex);
assert(loader->result == LYRICS_SUCCESS);
assert(loader->pid < 0);
assert(loader->thread == 0);
assert(loader->data != NULL);
return loader->data;
}
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