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| | /* config.cc - API for database metadata
*
* Copyright © 2016 David Bremner
*
* 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 3 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, see https://www.gnu.org/licenses/ .
*
* Author: David Bremner <david@tethera.net>
*/
#include "notmuch.h"
#include "notmuch-private.h"
#include "database-private.h"
static const std::string CONFIG_PREFIX = "C";
struct _notmuch_config_list {
notmuch_database_t *notmuch;
Xapian::TermIterator iterator;
char *current_key;
char *current_val;
};
static int
_notmuch_config_list_destroy (notmuch_config_list_t *list)
{
/* invoke destructor w/o deallocating memory */
list->iterator.~TermIterator();
return 0;
}
notmuch_status_t
notmuch_database_set_config (notmuch_database_t *notmuch,
const char *key,
const char *value)
{
notmuch_status_t status;
status = _notmuch_database_ensure_writable (notmuch);
if (status)
return status;
try {
notmuch->writable_xapian_db->set_metadata (CONFIG_PREFIX + key, value);
} catch (const Xapian::Error &error) {
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
notmuch->exception_reported = true;
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred setting metadata: %s\n",
error.get_msg ().c_str ());
}
return status;
}
static notmuch_status_t
_metadata_value (notmuch_database_t *notmuch,
const char *key,
std::string &value)
{
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
try {
value = notmuch->xapian_db->get_metadata (CONFIG_PREFIX + key);
} catch (const Xapian::Error &error) {
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
notmuch->exception_reported = true;
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred getting metadata: %s\n",
error.get_msg ().c_str ());
}
return status;
}
notmuch_status_t
notmuch_database_get_config (notmuch_database_t *notmuch,
const char *key,
char **value)
{
std::string strval;
notmuch_status_t status;
if (! value)
return NOTMUCH_STATUS_NULL_POINTER;
status = _metadata_value (notmuch, key, strval);
if (status)
return status;
*value = strdup (strval.c_str ());
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
notmuch_database_get_config_list (notmuch_database_t *notmuch,
const char *prefix,
notmuch_config_list_t **out)
{
notmuch_config_list_t *list = NULL;
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
list = talloc (notmuch, notmuch_config_list_t);
if (! list) {
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
list->notmuch = notmuch;
list->current_key = NULL;
list->current_val = NULL;
try {
new(&(list->iterator)) Xapian::TermIterator (notmuch->xapian_db->metadata_keys_begin
(CONFIG_PREFIX + (prefix ? prefix : "")));
talloc_set_destructor (list, _notmuch_config_list_destroy);
} catch (const Xapian::Error &error) {
_notmuch_database_log (notmuch, "A Xapian exception occurred getting metadata iterator: %s.\n",
error.get_msg ().c_str ());
notmuch->exception_reported = true;
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
}
*out = list;
DONE:
if (status) {
if (list) {
talloc_free (list);
if (status != NOTMUCH_STATUS_XAPIAN_EXCEPTION)
_notmuch_config_list_destroy (list);
}
} else {
talloc_set_destructor (list, _notmuch_config_list_destroy);
}
return status;
}
notmuch_bool_t
notmuch_config_list_valid (notmuch_config_list_t *metadata)
{
if (metadata->iterator == metadata->notmuch->xapian_db->metadata_keys_end ())
return false;
return true;
}
static inline char * _key_from_iterator (notmuch_config_list_t *list) {
return talloc_strdup (list, (*list->iterator).c_str () + CONFIG_PREFIX.length ());
}
const char *
notmuch_config_list_key (notmuch_config_list_t *list)
{
if (list->current_key)
talloc_free (list->current_key);
list->current_key = _key_from_iterator (list);
return list->current_key;
}
const char *
notmuch_config_list_value (notmuch_config_list_t *list)
{
std::string strval;
notmuch_status_t status;
char *key = _key_from_iterator (list);
/* TODO: better error reporting?? */
status = _metadata_value (list->notmuch, key, strval);
if (status)
return NULL;
if (list->current_val)
talloc_free (list->current_val);
list->current_val = talloc_strdup (list, strval.c_str ());
talloc_free (key);
return list->current_val;
}
void
notmuch_config_list_move_to_next (notmuch_config_list_t *list)
{
list->iterator++;
}
void
notmuch_config_list_destroy (notmuch_config_list_t *list)
{
talloc_free (list);
}
|