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return 0;
}
int ret = dc_sqlite3_set_config(sql, key, value_str);
free(value_str);
return ret;
}
/*******************************************************************************
* Transactions
******************************************************************************/
#undef USE_TRANSACTIONS
void dc_sqlite3_begin_transaction(dc_sqlite3_t* sql)
{
#ifdef USE_TRANSACTIONS
// `BEGIN IMMEDIATE` ensures, only one thread may write.
// all other calls to `BEGIN IMMEDIATE` will try over until sqlite3_busy_timeout() is reached.
// CAVE: This also implies that transactions MUST NOT be nested.
sqlite3_stmt* stmt = dc_sqlite3_prepare(sql, "BEGIN IMMEDIATE;");
if (sqlite3_step(stmt) != SQLITE_DONE) {
dc_sqlite3_log_error(sql, "Cannot begin transaction.");
}
sqlite3_finalize(stmt);
#endif
}
void dc_sqlite3_rollback(dc_sqlite3_t* sql)
{
#ifdef USE_TRANSACTIONS
sqlite3_stmt* stmt = dc_sqlite3_prepare(sql, "ROLLBACK;");
if (sqlite3_step(stmt) != SQLITE_DONE) {
dc_sqlite3_log_error(sql, "Cannot rollback transaction.");
}
sqlite3_finalize(stmt);
#endif
}
void dc_sqlite3_commit(dc_sqlite3_t* sql)
{
#ifdef USE_TRANSACTIONS
sqlite3_stmt* stmt = dc_sqlite3_prepare(sql, "COMMIT;");
if (sqlite3_step(stmt) != SQLITE_DONE) {
dc_sqlite3_log_error(sql, "Cannot commit transaction.");
}
sqlite3_finalize(stmt);
#endif
}
/*******************************************************************************
* Housekeeping
******************************************************************************/
static void maybe_add_file(dc_hash_t* files_in_use, const char* file)
{
#define PREFIX "$BLOBDIR/"
#define PREFIX_LEN 9
if (strncmp(file, PREFIX, PREFIX_LEN)!=0) {
return;
}
const char* raw_name = &file[PREFIX_LEN];
dc_hash_insert_str(files_in_use, raw_name, (void*)1);
}
static void maybe_add_from_param(dc_context_t* context, dc_hash_t* files_in_use,
const char* query, int param_id)
{
dc_param_t* param = dc_param_new();
sqlite3_stmt* stmt = dc_sqlite3_prepare(context->sql, query);
while (sqlite3_step(stmt)==SQLITE_ROW)
{
dc_param_set_packed(param, (const char*)sqlite3_column_text(stmt, 0));
char* file = dc_param_get(param, param_id, NULL);
if (file!=NULL) {
maybe_add_file(files_in_use, file);
free(file);
}
}
sqlite3_finalize(stmt);
dc_param_unref(param);
}
static int is_file_in_use(dc_hash_t* files_in_use, const char* namespc, const char* name)
{
char* name_to_check = dc_strdup(name);
if (namespc) {
int name_len = strlen(name);