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owntone-server/src/db-sql-sqlite2.c

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/*
* $Id$
* sqlite2-specific db implementation
*
* Copyright (C) 2005 Ron Pedde (ron@pedde.com)
*
* 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
*/
/*
* This file handles sqlite2 databases. SQLite2 databases
* should have a dsn of:
*
* sqlite2:/path/to/folder
*
* The actual db will be appended to the passed path.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite.h>
#include <unistd.h>
#include "err.h"
#include "db-generic.h"
#include "db-sql.h"
#include "db-sql-sqlite2.h"
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif
/* Globals */
static sqlite *db_sqlite2_songs; /**< Database that holds the mp3 info */
static pthread_mutex_t db_sqlite2_mutex = PTHREAD_MUTEX_INITIALIZER; /**< sqlite not reentrant */
static sqlite_vm *db_sqlite2_pvm;
static int db_sqlite2_reload=0;
static char *db_sqlite2_enum_query;
static int db_sqlite2_in_enum=0;
static char db_sqlite2_path[PATH_MAX + 1];
#define DB_SQLITE2_VERSION 8
/* Forwards */
void db_sqlite2_lock(void);
void db_sqlite2_unlock(void);
extern char *db_initial;
/**
* lock the db_mutex
*/
void db_sqlite2_lock(void) {
int err;
if((err=pthread_mutex_lock(&db_sqlite2_mutex))) {
DPRINTF(E_FATAL,L_DB,"cannot lock sqlite lock: %s\n",strerror(err));
}
}
/**
* unlock the db_mutex
*/
void db_sqlite2_unlock(void) {
int err;
if((err=pthread_mutex_unlock(&db_sqlite2_mutex))) {
DPRINTF(E_FATAL,L_DB,"cannot unlock sqlite2 lock: %s\n",strerror(err));
}
}
/**
*
*/
char *db_sqlite2_vmquery(char *fmt,va_list ap) {
return sqlite_vmprintf(fmt,ap);
}
/**
*
*/
void db_sqlite2_vmfree(char *query) {
sqlite_freemem(query);
}
/**
* open a sqlite2 database
*
* @param dsn the full dns to the database
* (sqlite2:/path/to/database)
*
* @returns DB_E_SUCCESS on success
*/
int db_sqlite2_open(char **pe, char *dsn) {
char *perr;
int ver;
int err;
snprintf(db_sqlite2_path,sizeof(db_sqlite2_path),"%s/songs.db",dsn);
db_sqlite2_lock();
db_sqlite2_songs=sqlite_open(db_sqlite2_path,0666,&perr);
if(!db_sqlite2_songs) {
db_get_error(pe,DB_E_SQL_ERROR,perr);
DPRINTF(E_LOG,L_DB,"db_sqlite2_open: %s (%s)\n",perr,
db_sqlite2_path);
sqlite_freemem(perr);
db_sqlite2_unlock();
return DB_E_SQL_ERROR;
}
sqlite_busy_timeout(db_sqlite2_songs,30000); /* 30 seconds */
db_sqlite2_unlock();
err = db_sql_fetch_int(pe,&ver,"select value from config where "
"term='version'");
if(err != DB_E_SUCCESS) {
if(pe) { free(*pe); }
/* we'll catch this on the init */
DPRINTF(E_LOG,L_DB,"Can't get db version. New database?\n");
} else if(ver != DB_SQLITE2_VERSION) {
DPRINTF(E_FATAL,L_DB,"Can't upgrade database!\n");
}
return DB_E_SUCCESS;
}
/**
* close the database
*/
int db_sqlite2_close(void) {
db_sqlite2_lock();
sqlite_close(db_sqlite2_songs);
db_sqlite2_unlock();
return DB_E_SUCCESS;
}
/**
* execute a throwaway query against the database, disregarding
* the outcome
*
* @param pe db error structure
* @param loglevel error level to return if the query fails
* @param fmt sprintf-style arguements
*
* @returns DB_E_SUCCESS on success
*/
int db_sqlite2_exec(char **pe, int loglevel, char *fmt, ...) {
va_list ap;
char *query;
int err;
char *perr;
va_start(ap,fmt);
query=sqlite_vmprintf(fmt,ap);
va_end(ap);
DPRINTF(E_DBG,L_DB,"Executing: %s\n",query);
db_sqlite2_lock();
err=sqlite_exec(db_sqlite2_songs,query,NULL,NULL,&perr);
if(err != SQLITE_OK) {
db_get_error(pe,DB_E_SQL_ERROR,perr);
DPRINTF(loglevel == E_FATAL ? E_LOG : loglevel,L_DB,"Query: %s\n",
query);
DPRINTF(loglevel,L_DB,"Error: %s\n",perr);
sqlite_freemem(perr);
} else {
DPRINTF(E_DBG,L_DB,"Rows: %d\n",sqlite_changes(db_sqlite2_songs));
}
sqlite_freemem(query);
db_sqlite2_unlock();
if(err != SQLITE_OK)
return DB_E_SQL_ERROR;
return DB_E_SUCCESS;
}
/**
* start enumerating rows in a select
*/
int db_sqlite2_enum_begin(char **pe, char *fmt, ...) {
va_list ap;
int err;
char *perr;
const char *ptail;
if(!db_sqlite2_in_enum) {
va_start(ap, fmt);
db_sqlite2_lock();
db_sqlite2_enum_query = sqlite_vmprintf(fmt,ap);
va_end(ap);
}
DPRINTF(E_DBG,L_DB,"Executing: %s\n",db_sqlite2_enum_query);
db_sqlite2_in_enum=1;
err=sqlite_compile(db_sqlite2_songs,db_sqlite2_enum_query,
&ptail,&db_sqlite2_pvm,&perr);
if(err != SQLITE_OK) {
db_get_error(pe,DB_E_SQL_ERROR,perr);
sqlite_freemem(perr);
db_sqlite2_in_enum=0;
db_sqlite2_unlock();
sqlite_freemem(db_sqlite2_enum_query);
return DB_E_SQL_ERROR;
}
/* otherwise, we leave the db locked while we walk through the enums */
return DB_E_SUCCESS;
}
/**
* fetch the next row
*
* @param pe error string, if result isn't DB_E_SUCCESS
* @param pr pointer to a row struct
*
* @returns DB_E_SUCCESS with *pr=NULL when end of table,
* DB_E_SUCCESS with a valid row when more data,
* DB_E_* on error
*/
int db_sqlite2_enum_fetch(char **pe, SQL_ROW *pr) {
int err;
char *perr=NULL;;
const char **colarray;
int cols;
int counter=10;
while(counter--) {
err=sqlite_step(db_sqlite2_pvm,&cols,(const char ***)pr,&colarray);
if(err != SQLITE_BUSY)
break;
usleep(100);
}
if(err == SQLITE_DONE) {
*pr = NULL;
return DB_E_SUCCESS;
}
if(err == SQLITE_ROW) {
return DB_E_SUCCESS;
}
db_get_error(pe,DB_E_SQL_ERROR,perr);
return DB_E_SQL_ERROR;
}
/**
* end the db enumeration
*/
int db_sqlite2_enum_end(char **pe) {
int err;
char *perr;
db_sqlite2_in_enum=0;
sqlite_freemem(db_sqlite2_enum_query);
err = sqlite_finalize(db_sqlite2_pvm,&perr);
if(err != SQLITE_OK) {
db_get_error(pe,DB_E_SQL_ERROR,perr);
sqlite_freemem(perr);
db_sqlite2_unlock();
return DB_E_SQL_ERROR;
}
db_sqlite2_unlock();
return DB_E_SUCCESS;
}
/**
* restart the enumeration
*/
int db_sqlite2_enum_restart(char **pe) {
return db_sqlite2_enum_begin(pe,NULL);
}
int db_sqlite2_event(int event_type) {
switch(event_type) {
case DB_SQL_EVENT_STARTUP: /* this is a startup with existing songs */
db_sqlite2_exec(NULL,E_FATAL,"vacuum");
db_sqlite2_reload=0;
break;
case DB_SQL_EVENT_FULLRELOAD: /* either a fresh load or force load */
db_sqlite2_exec(NULL,E_DBG,"drop index idx_path");
db_sqlite2_exec(NULL,E_DBG,"drop index idx_songid");
db_sqlite2_exec(NULL,E_DBG,"drop index idx_playlistid");
db_sqlite2_exec(NULL,E_DBG,"drop table songs");
db_sqlite2_exec(NULL,E_DBG,"drop table playlists");
db_sqlite2_exec(NULL,E_DBG,"drop table playlistitems");
db_sqlite2_exec(NULL,E_DBG,"drop table config");
db_sqlite2_exec(NULL,E_DBG,"vacuum");
db_sqlite2_exec(NULL,E_DBG,db_initial);
db_sqlite2_reload=1;
break;
case DB_SQL_EVENT_SONGSCANSTART:
if(db_sqlite2_reload) {
db_sqlite2_exec(NULL,E_FATAL,"pragma synchronous = off");
db_sqlite2_exec(NULL,E_FATAL,"begin transaction");
} else {
db_sqlite2_exec(NULL,E_DBG,"drop table updated");
db_sqlite2_exec(NULL,E_FATAL,"create temp table updated (id int)");
db_sqlite2_exec(NULL,E_DBG,"drop table plupdated");
db_sqlite2_exec(NULL,E_FATAL,"create temp table plupdated(id int)");
}
break;
case DB_SQL_EVENT_SONGSCANEND:
if(db_sqlite2_reload) {
db_sqlite2_exec(NULL,E_FATAL,"commit transaction");
db_sqlite2_exec(NULL,E_FATAL,"create index idx_path on songs(path)");
db_sqlite2_exec(NULL,E_DBG,"delete from config where term='rescan'");
} else {
db_sqlite2_exec(NULL,E_FATAL,"delete from songs where id not in (select id from updated)");
db_sqlite2_exec(NULL,E_FATAL,"update songs set force_update=0");
db_sqlite2_exec(NULL,E_FATAL,"drop table updated");
}
break;
case DB_SQL_EVENT_PLSCANSTART:
db_sqlite2_exec(NULL,E_FATAL,"begin transaction");
break;
case DB_SQL_EVENT_PLSCANEND:
db_sqlite2_exec(NULL,E_FATAL,"end transaction");
if(db_sqlite2_reload) {
db_sqlite2_exec(NULL,E_FATAL,"pragma synchronous=normal");
db_sqlite2_exec(NULL,E_FATAL,"create index idx_songid on playlistitems(songid)");
db_sqlite2_exec(NULL,E_FATAL,"create index idx_playlistid on playlistitems(playlistid)");
} else {
db_sqlite2_exec(NULL,E_FATAL,"delete from playlists where "
"((type=%d) OR (type=%d)) and "
"id not in (select id from plupdated)",
PL_STATICFILE,PL_STATICXML);
db_sqlite2_exec(NULL,E_FATAL,"delete from playlistitems where "
"playlistid not in (select distinct "
"id from playlists)");
db_sqlite2_exec(NULL,E_FATAL,"drop table plupdated");
}
break;
default:
break;
}
return DB_E_SUCCESS;
}
char *db_initial =
"create table songs (\n"
" id INTEGER PRIMARY KEY NOT NULL,\n"
" path VARCHAR(4096) UNIQUE NOT NULL,\n"
" fname VARCHAR(255) NOT NULL,\n"
" title VARCHAR(1024) DEFAULT NULL,\n"
" artist VARCHAR(1024) DEFAULT NULL,\n"
" album VARCHAR(1024) DEFAULT NULL,\n"
" genre VARCHAR(255) DEFAULT NULL,\n"
" comment VARCHAR(4096) DEFAULT NULL,\n"
" type VARCHAR(255) DEFAULT NULL,\n"
" composer VARCHAR(1024) DEFAULT NULL,\n"
" orchestra VARCHAR(1024) DEFAULT NULL,\n"
" conductor VARCHAR(1024) DEFAULT NULL,\n"
" grouping VARCHAR(1024) DEFAULT NULL,\n"
" url VARCHAR(1024) DEFAULT NULL,\n"
" bitrate INTEGER DEFAULT 0,\n"
" samplerate INTEGER DEFAULT 0,\n"
" song_length INTEGER DEFAULT 0,\n"
" file_size INTEGER DEFAULT 0,\n"
" year INTEGER DEFAULT 0,\n"
" track INTEGER DEFAULT 0,\n"
" total_tracks INTEGER DEFAULT 0,\n"
" disc INTEGER DEFAULT 0,\n"
" total_discs INTEGER DEFAULT 0,\n"
" bpm INTEGER DEFAULT 0,\n"
" compilation INTEGER DEFAULT 0,\n"
" rating INTEGER DEFAULT 0,\n"
" play_count INTEGER DEFAULT 0,\n"
" data_kind INTEGER DEFAULT 0,\n"
" item_kind INTEGER DEFAULT 0,\n"
" description INTEGER DEFAULT 0,\n"
" time_added INTEGER DEFAULT 0,\n"
" time_modified INTEGER DEFAULT 0,\n"
" time_played INTEGER DEFAULT 0,\n"
" db_timestamp INTEGER DEFAULT 0,\n"
" disabled INTEGER DEFAULT 0,\n"
" sample_count INTEGER DEFAULT 0,\n"
" force_update INTEGER DEFAULT 0,\n"
" codectype VARCHAR(5) DEFAULT NULL,\n"
" idx INTEGER NOT NULL\n"
");\n"
"create table config (\n"
" term VARCHAR(255) NOT NULL,\n"
" subterm VARCHAR(255) DEFAULT NULL,\n"
" value VARCHAR(1024) NOT NULL\n"
");\n"
"create table playlistitems (\n"
" id INTEGER PRIMARY KEY NOT NULL,\n"
" playlistid INTEGER NOT NULL,\n"
" songid INTEGER NOT NULL\n"
");\n"
"create table playlists (\n"
" id INTEGER PRIMARY KEY NOT NULL,\n"
" title VARCHAR(255) NOT NULL,\n"
" type INTEGER NOT NULL,\n"
" items INTEGER NOT NULL,\n"
" query VARCHAR(1024),\n"
" db_timestamp INTEGER NOT NULL,\n"
" path VARCHAR(4096),\n"
" idx INTEGER NOT NULL\n"
");\n"
"insert into config values ('version','','8');\n"
"insert into playlists values (1,'Library',1,0,'1',0,'',0);\n"
"create index idx_path on songs(path);\n"
"create index idx_songid on playlistitems(songid);\n"
"create index idx_playlistid on playlistitems(playlistid);\n";
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