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| | /* metadata.cc - API for database metadata
*
* Copyright © 2015 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 http://www.gnu.org/licenses/ .
*
* Author: David Bremner <david@tethera.net>
*/
#include "notmuch.h"
#include "notmuch-private.h"
#include "database-private.h"
struct _notmuch_metadata {
notmuch_database_t *notmuch;
Xapian::TermIterator *iterator;
notmuch_metadata_class_t mclass;
};
static int
_notmuch_metadata_destroy (notmuch_metadata_t *list) {
delete list->iterator;
return 0;
}
static
const char *
_find_metadata_prefix (notmuch_metadata_class_t mclass)
{
switch (mclass) {
case NOTMUCH_METADATA_CONFIG:
return "C";
default:
return NULL;
}
}
notmuch_status_t _make_key(void *ctx, notmuch_metadata_class_t mclass,
const char *in, const char **out)
{
const char *term;
const char *prefix = NULL;
if (!out)
return NOTMUCH_STATUS_NULL_POINTER;
prefix = _find_metadata_prefix(mclass);
if (!prefix)
return NOTMUCH_STATUS_UNSUPPORTED_OPERATION;
term = talloc_asprintf (ctx, "%s%s",
prefix, in);
if (!term)
return NOTMUCH_STATUS_OUT_OF_MEMORY;
*out = term;
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
notmuch_database_set_metadata (notmuch_database_t *notmuch,
notmuch_metadata_class_t mclass,
const char *key,
const char *value)
{
notmuch_status_t status;
Xapian::WritableDatabase *db;
const char *key_term = NULL;
void *local;
local = talloc_new (NULL);
status = _notmuch_database_ensure_writable (notmuch);
if (status)
goto DONE;
status = _make_key (local, mclass, key, &key_term);
if (status)
goto DONE;
try {
db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
db->set_metadata (key_term, value);
} catch (const Xapian::Error &error) {
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
notmuch->exception_reported = TRUE;
if (! notmuch->exception_reported) {
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred setting metadata: %s\n",
error.get_msg().c_str());
}
}
DONE:
talloc_free (local);
return status;
}
static notmuch_status_t
_metadata_value (notmuch_database_t *notmuch,
notmuch_metadata_class_t mclass,
const char *key,
std::string &value)
{
notmuch_status_t status;
const char *key_term = NULL;
void *local;
local = talloc_new (NULL);
status = _make_key (local, mclass, key, &key_term);
if (status)
goto DONE;
try {
value = notmuch->xapian_db->get_metadata (key_term);
} catch (const Xapian::Error &error) {
status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
notmuch->exception_reported = TRUE;
if (! notmuch->exception_reported) {
_notmuch_database_log (notmuch, "Error: A Xapian exception occurred getting metadata: %s\n",
error.get_msg().c_str());
}
}
DONE:
talloc_free (local);
return status;
}
notmuch_status_t
notmuch_database_get_metadata (notmuch_database_t *notmuch,
notmuch_metadata_class_t mclass,
const char *key,
char **value) {
std::string strval;
notmuch_status_t status;
if (!value)
return NOTMUCH_STATUS_NULL_POINTER;
status = _metadata_value (notmuch, mclass, key, strval);
if (status)
return status;
*value = strdup (strval.c_str ());
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
notmuch_database_get_all_metadata (notmuch_database_t *notmuch,
notmuch_metadata_class_t mclass,
notmuch_metadata_t **out)
{
notmuch_metadata_t *list = NULL;
notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
const char *prefix = _find_metadata_prefix (mclass);
list = talloc (notmuch, notmuch_metadata_t);
if (!list) {
status = NOTMUCH_STATUS_OUT_OF_MEMORY;
goto DONE;
}
talloc_set_destructor(list, _notmuch_metadata_destroy);
list->iterator = new Xapian::TermIterator;
list->notmuch = notmuch;
list->mclass = mclass;
try {
*list->iterator = notmuch->xapian_db->metadata_keys_begin();
list->iterator->skip_to (prefix);
} 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 && list)
talloc_free (list);
return status;
}
notmuch_bool_t
notmuch_metadata_valid (notmuch_metadata_t *metadata)
{
const char *prefix = _find_metadata_prefix (metadata->mclass);
if (*(metadata->iterator) == metadata->notmuch->xapian_db->metadata_keys_end())
return FALSE;
return (strncmp((**(metadata->iterator)).c_str (), prefix, strlen (prefix)) == 0);
}
|