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sql.c
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sql.c
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#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include "log.h"
#include "sql.h"
static int _get_version(sqlite3 *db);
static int _set_version(sqlite3 *db);
static int _set_version0(sqlite3 *db, int version);
GTree *get_db_backups (sqlite3 *db);
gboolean increment_database_name (gpointer key, gpointer val, gpointer data);
gboolean unlink_func (gpointer key, gpointer val, gpointer data);
int cp (const char *from, const char *to);
char *upgrade_list [] =
{
"alter table file_tag rename to file_tag_old;"
"create table file_tag(file integer, tag integer, value blob,"
" primary key (file,tag),"
" foreign key (file) references file(id),"
" foreign key (tag) references tag(id));"
"insert into file_tag"
" select file, tag, default_value from file_tag_old,tag"
" where tag=id;"
"insert into file_tag"
" select file, tag, NULL from file_tag_old,tag"
" where tag is NULL;"
"drop table file_tag_old;"
,
"alter table file_tag rename to file_tag_old;"
"create table file_tag(file integer not null, tag integer not null, value blob,"
" primary key (file,tag),"
" foreign key (file) references file(id),"
" foreign key (tag) references tag(id));"
"insert into file_tag"
" select file, tag, value from file_tag_old where tag is not null;"
"drop table file_tag_old;",
"drop table tag_union;"
};
char *tables =
/* a table associating tags to files */
"create table IF NOT EXISTS file_tag(file integer not null, tag integer not null, value blob,"
" primary key (file,tag),"
" foreign key (file) references file(id),"
" foreign key (tag) references tag(id));"
/* a table of tag names, ids, and default_values to set for files */
"create table IF NOT EXISTS tag(id integer primary key, name varchar(255), default_value blob);"
/* a table of file names, ids */
"create table IF NOT EXISTS file(id integer primary key, name varchar(255));"
/* a table associating tags to sub-tags. */
"create table IF NOT EXISTS subtag(super integer, sub integer unique,"
" foreign key (super) references tag(id),"
" foreign key (sub) references tag(id));"
;
int _sql_exec(sqlite3 *db, char *cmd, const char *file, int line_number)
{
char *errmsg = NULL;
int sqlite_res = sqlite3_exec(db, cmd, NULL, NULL, &errmsg);
if (sqlite_res != 0)
{
log_msg1(ERROR, file, line_number, "sqlite3_exec:%s", errmsg);
sqlite3_free(errmsg);
}
return sqlite_res;
}
int _sql_next_row(sqlite3_stmt *stmt, const char *file, int line_number)
{
int status = sqlite3_step(stmt);
if ((status == SQLITE_ROW) || (status == SQLITE_DONE))
{
return status;
}
else
{
log_msg1(ERROR, file, line_number, "We didn't finish the select statemnt. Status code: %d", status);
return status;
}
}
int _sql_step (sqlite3_stmt *stmt, const char *file, int line_number)
{
int status = sqlite3_step(stmt);
if (status == SQLITE_DONE || status == SQLITE_ROW)
{
return status;
}
else
{
sqlite3 *db = sqlite3_db_handle(stmt);
const char *msg = sqlite3_errmsg(db);
log_msg1(ERROR, file, line_number, "sqlite3_step: We couldn't complete the statement: %s(%d)", msg, status);
return status;
}
}
void sql_begin_transaction(sqlite3 *db)
{
sql_exec(db, "begin transaction");
}
void sql_commit(sqlite3 *db)
{
sql_exec(db, "commit");
}
/* Returns -1 if there's a failure.
* Returns 0 if the database was empty (version = 0)
* Returns 1 if the database successfully updated to the current
* version and the normal create statements don't need to run.
*/
int try_upgrade_db (sqlite3 *db)
{
return try_upgrade_db0(db, DB_VERSION);
}
int try_upgrade_db0 (sqlite3 *db, int target_version)
{
int database_version = _get_version(db);
if (database_version == 0)
{
return 0;
}
if (database_version < target_version)
{
if (database_backup(db))
{
error("Couldn't backup the database before upgrading");
return -1;
}
for (int i = database_version; i < target_version; i++)
{
sql_begin_transaction(db);
int res = sql_exec(db, upgrade_list[i - 1]);
sql_commit(db);
if (res != SQLITE_OK)
{
error("Error upgrading the database. SQLite error code: %d", res);
return -1;
}
}
_set_version0(db, target_version);
}
else if (database_version == target_version)
{
return 1;
}
else
{
error("Database version (%d) is greater than software version (%d).",
database_version, target_version);
return -1;
}
return 1;
}
struct
{
const char *dirname;
const char *base;
int backups_renamed;
} FILE_NAME_DATA;
int _name_cmp (const void *a, const void *b, gpointer _UNUSED_)
{
return -(strcmp((char *)a, (char *)b));
}
int database_backup (sqlite3 *db)
{
int res = 0;
const char *db_name = sqlite3_db_filename(db, "main");
char *db_directory = g_path_get_dirname(db_name);
debug("directory_name = %s", db_directory);
char *db_base = g_path_get_basename(db_name);
int backed_up_count = 0;
GTree *database_names = get_db_backups(db);
backed_up_count = g_tree_nnodes(database_names);
FILE_NAME_DATA.dirname = db_directory;
FILE_NAME_DATA.base = db_base;
FILE_NAME_DATA.backups_renamed = 0;
if (backed_up_count > 0)
{
g_tree_foreach(database_names, increment_database_name, NULL);
}
if (backed_up_count != FILE_NAME_DATA.backups_renamed)
{
res = -1;
}
g_tree_destroy(database_names);
g_free(db_base);
g_free(db_directory);
return res;
}
gboolean increment_database_name (gpointer key, gpointer val, gpointer data)
{
static char src[PATH_MAX];
static char dest[PATH_MAX];
const char *base = FILE_NAME_DATA.base;
char *orig_name = key;
char *past_the_base = orig_name + strlen(base);
char *number_part = past_the_base + strlen(BKP_PART);
int n = 0;
gboolean on_active_db = FALSE;
if (*past_the_base != 0)
{
n = atoi(number_part) + 1;
}
else
{
on_active_db = TRUE;
}
sprintf(src, "%s/%s", FILE_NAME_DATA.dirname, orig_name);
sprintf(dest, "%s/%s%s%03d", FILE_NAME_DATA.dirname, base, BKP_PART, n);
if (n >= 1000)
{
warn("Possibly overwriting %s: More than 1000 backups are not supported.", src);
}
else
{
if (on_active_db)
{
if (cp(src, dest))
{
error("Couldn't copy %s to %s", src, dest);
return TRUE;
}
}
else
{
if (rename(src, dest))
{
error("Couldn't rename %s to %s", src, dest);
return TRUE;
}
}
FILE_NAME_DATA.backups_renamed++;
}
return FALSE;
}
gboolean database_clear_backups (sqlite3 *db)
{
GTree *names = get_db_backups(db);
g_tree_foreach(names, unlink_func, db);
g_tree_destroy(names);
return TRUE;
}
gboolean unlink_func (gpointer key, gpointer val, gpointer data)
{
char src[PATH_MAX];
char *orig_name = key;
sqlite3 *db = data;
const char *db_name = sqlite3_db_filename(db, "main");
const char *db_directory = g_path_get_dirname(db_name);
sprintf(src, "%s/%s", db_directory, orig_name);
unlink(src);
g_free((gpointer)db_directory);
return FALSE;
}
GTree *get_db_backups (sqlite3 *db)
{
const char *db_name = sqlite3_db_filename(db, "main");
const char *db_directory = g_path_get_dirname(db_name);
const char *db_base = g_path_get_basename(db_name);
debug("directory_name = %s", db_directory);
DIR *d = opendir(db_directory);
struct dirent *de = NULL;
GTree *database_names = g_tree_new_full(_name_cmp, NULL, g_free, NULL);
while ((de = readdir(d)) != NULL)
{
char *dirent_name = de->d_name;
debug("dirent_name = %s", dirent_name);
if (strstr(dirent_name, db_base) == dirent_name)
{
g_tree_insert(database_names, g_strdup(dirent_name), NULL);
}
}
closedir(d);
g_free((gpointer)db_directory);
g_free((gpointer)db_base);
return database_names;
}
gboolean database_init(sqlite3 *db)
{
int status = try_upgrade_db(db);
int res = TRUE;
sql_begin_transaction(db);
if (status == 0)
{
status = sql_exec(db, tables);
if (status != SQLITE_OK)
{
error("Couldn't set up the database. SQLite error code: %d", status);
res = FALSE;
}
_set_version(db);
}
else if (status == -1)
{
error("Couldn't set up the database.");
res = FALSE;
}
sql_commit(db);
return res;
}
sqlite3* sql_init (const char *db_fname)
{
sqlite3 *sqlite_db;
int sqlite_flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_FULLMUTEX;
/* 256 MB mmap file */
if (sqlite3_open_v2(db_fname, &sqlite_db, sqlite_flags, NULL) != SQLITE_OK)
{
const char *msg = sqlite3_errmsg(sqlite_db);
error(msg);
}
sqlite3_extended_result_codes(sqlite_db, 1);
sql_exec(sqlite_db, "PRAGMA mmap_size=268435456");
/* copied from xmms2 settings */
sql_exec(sqlite_db, "PRAGMA synchronous = OFF");
sql_exec(sqlite_db, "PRAGMA auto_vacuum = 1");
sql_exec(sqlite_db, "PRAGMA cache_size = 8000");
sql_exec(sqlite_db, "PRAGMA temp_store = MEMORY");
sql_exec(sqlite_db, "PRAGMA foreign_keys = ON");
/* One minute */
sqlite3_busy_timeout (sqlite_db, 60000);
if (database_init(sqlite_db))
{
return sqlite_db;
}
else
{
error("Database initialiation failed, returning NULL for sqlite3 database.");
return NULL;
}
}
static int
_sqlite_version_cb (void *pArg, int argc, char **argv, char **columnName)
{
int *id = pArg;
if (argv[0]) {
*id = atoi (argv[0]);
} else {
*id = 0;
}
return 0;
}
static int _get_version(sqlite3 *db)
{
int res;
sqlite3_exec(db, "pragma user_version", _sqlite_version_cb, &res, NULL);
return res;
}
static int _set_version0(sqlite3 *db, int version)
{
int res;
static char cmd_string[32];
sprintf(cmd_string, "pragma user_version = %d", version);
res = sql_exec(db, cmd_string);
return res;
}
static int _set_version(sqlite3 *db)
{
int res;
res = sql_exec(db, "pragma user_version = " DB_VERSION_S);
return res;
}
/* Copied from http://stackoverflow.com/a/2180788/638671 . Thanks to user 'caf'. */
int cp (const char *from, const char *to)
{
int fd_to, fd_from;
char buf[4096];
ssize_t nread;
int saved_errno;
fd_from = open(from, O_RDONLY);
if (fd_from < 0)
return -1;
fd_to = open(to, O_WRONLY | O_CREAT | O_EXCL, 0666);
if (fd_to < 0)
goto out_error;
while (nread = read(fd_from, buf, sizeof buf), nread > 0)
{
char *out_ptr = buf;
ssize_t nwritten;
do {
nwritten = write(fd_to, out_ptr, nread);
if (nwritten >= 0)
{
nread -= nwritten;
out_ptr += nwritten;
}
else if (errno != EINTR)
{
goto out_error;
}
} while (nread > 0);
}
if (nread == 0)
{
if (close(fd_to) < 0)
{
fd_to = -1;
goto out_error;
}
close(fd_from);
/* Success! */
return 0;
}
out_error:
saved_errno = errno;
close(fd_from);
if (fd_to >= 0)
close(fd_to);
errno = saved_errno;
return -1;
}
int _sql_prepare (sqlite3 *db, const char *command, sqlite3_stmt **stmtp, const char *file, int line_number)
{
int res = sqlite3_prepare_v2(db, command, -1, stmtp, NULL);
if (res != SQLITE_OK)
{
log_msg1(ERROR, file, line_number, "sqlite3_prepare: %d", res);
}
return res;
}