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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Musicfs is a FUSE module implementing a media filesystem in userland.
* Copyright (C) 2008 Ulf Lilleengen, Kjetil Ørbekk
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2, as published by the Free Software Foundation.
*
* 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.
*
* A copy of the license can typically be found in COPYING
*/
#include <fusever.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sqlite3.h>
#include <pthread.h>
#include <debug.h>
#include <musicfs.h>
int
execute_statement(sqlite3 *handle, const char *query,
const char *fields[])
{
sqlite3_stmt *st;
int res;
res = sqlite3_prepare_v2(handle, query, -1, &st, NULL);
if (res != SQLITE_OK) {
DEBUG("Error preparing statement: %s\n",
sqlite3_errmsg(handle));
return (-1);
}
for (int i=0; fields[i] != NULL; i++) {
sqlite3_bind_text(st, i+1, fields[i], -1, SQLITE_TRANSIENT);
}
res = sqlite3_step(st);
if (res != SQLITE_DONE) {
DEBUG("Error executing query %s\n\t %s\n",
query, sqlite3_errmsg(handle));
return (-1);
}
sqlite3_finalize(st);
return (0);
}
void
delete_from_path(sqlite3 *handle, const char *path)
{
const char *fields[] = {path, NULL};
execute_statement(handle,
"DELETE FROM song WHERE filepath LIKE (?||'%')",
fields);
}
void
delete_artist(sqlite3 *handle, const char *artist)
{
const char *fields[] = {artist, NULL};
execute_statement(handle,
"DELETE FROM artist WHERE name == ?",
fields);
}
void
delete_genre(sqlite3 *handle, const char *genre)
{
const char *fields[] = {genre, NULL};
execute_statement(handle,
"DELETE FROM genre WHERE name == ?",
fields);
}
void
cleanup_artists(sqlite3 *handle)
{
sqlite3_stmt *st;
int res;
const char *artist, *song_title;
/* This is a slow, but probably faster than doing a lot of
queries */
res = sqlite3_prepare_v2(handle, "SELECT a.name, s.title "
"FROM artist AS a LEFT JOIN song AS s ON "
"(a.name==s.artistname) GROUP BY a.name",
-1, &st, NULL);
if (res != SQLITE_OK) {
DEBUG("Error preparing statement: %s\n",
sqlite3_errmsg(handle));
return;
}
res = sqlite3_step(st);
while (res == SQLITE_ROW) {
artist = (const char*)sqlite3_column_text(st, 0);
song_title = (const char*)sqlite3_column_text(st, 1);
if (song_title == NULL || strcmp(song_title, "") == 0) {
/* No song by this artist */
delete_artist(handle, artist);
}
res = sqlite3_step(st);
}
}
void
cleanup_genres(sqlite3 *handle)
{
/* pretty much the same as cleanup_artist, only for genres */
sqlite3_stmt *st;
int res;
const char *genre, *song_title;
res = sqlite3_prepare_v2(handle, "SELECT g.name, s.title "
"FROM genre AS g LEFT JOIN song AS s ON "
"(g.name==s.genrename) GROUP BY g.name",
-1, &st, NULL);
if (res != SQLITE_OK) {
DEBUG("Error preparing statement: %s\n",
sqlite3_errmsg(handle));
return;
}
res = sqlite3_step(st);
while (res == SQLITE_ROW) {
genre = (const char*)sqlite3_column_text(st, 0);
song_title = (const char*)sqlite3_column_text(st, 1);
if (song_title == NULL || strcmp(song_title, "") == 0) {
/* No song with this genre */
delete_genre(handle, genre);
}
res = sqlite3_step(st);
}
}
/*
* Clean up the database:
*
* - Remove disabled paths
* - Remove songs in disabled paths
* - Remove unused artists and genres
*/
void
mfs_cleanup_db(sqlite3 *handle)
{
DEBUG("cleaning up db\n");
/* sqlite doesn't support deleting from multiple tables at the
same time :-( */
sqlite3_stmt *st;
int res;
const char *path;
/* Removed songs from inactive paths */
res = sqlite3_prepare_v2(handle, "SELECT path FROM path WHERE "
"active = 0", -1, &st, NULL);
if (res != SQLITE_OK) {
DEBUG("Error preparing statement: %s\n",
sqlite3_errmsg(handle));
return;
}
res = sqlite3_step(st);
while (res == SQLITE_ROW) {
path = (const char*)sqlite3_column_text(st, 0);
delete_from_path(handle, path);
res = sqlite3_step(st);
}
sqlite3_finalize(st);
/* Remove the actual paths */
res = sqlite3_prepare_v2(handle, "DELETE FROM path WHERE "
"active = 0", -1, &st, NULL);
if (res != SQLITE_OK) {
DEBUG("Error preparing statement: %s\n",
sqlite3_errmsg(handle));
return;
}
res = sqlite3_step(st);
if (res != SQLITE_DONE) {
DEBUG("Error deleting inactive paths from db: %s\n",
sqlite3_errmsg(handle));
return;
}
sqlite3_finalize(st);
/* These are a bit heavy :-( */
cleanup_artists(handle);
cleanup_genres(handle);
}
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