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/* mongo-sync-cursor.c - libmongo-client cursor API on top of Sync
* Copyright 2011, 2012 Gergely Nagy <algernon@balabit.hu>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/** @file src/mongo-sync-cursor.c
* MongoDB Cursor API implementation.
*/
#include "config.h"
#include "mongo.h"
#include "libmongo-private.h"
#include <errno.h>
mongo_sync_cursor *
mongo_sync_cursor_new (mongo_sync_connection *conn, const gchar *ns,
mongo_packet *packet)
{
mongo_sync_cursor *c;
if (!conn)
{
errno = ENOTCONN;
return NULL;
}
if (!ns || !packet)
{
errno = EINVAL;
return NULL;
}
c = g_new0 (mongo_sync_cursor, 1);
c->conn = conn;
c->ns = g_strdup (ns);
c->results = packet;
c->offset = -1;
mongo_wire_reply_packet_get_header (c->results, &c->ph);
return c;
}
gboolean
mongo_sync_cursor_next (mongo_sync_cursor *cursor)
{
if (!cursor)
{
errno = EINVAL;
return FALSE;
}
errno = 0;
if (cursor->offset >= cursor->ph.returned - 1)
{
gint32 ret = cursor->ph.returned;
gint64 cid = cursor->ph.cursor_id;
mongo_wire_packet_free (cursor->results);
cursor->offset = -1;
cursor->results = mongo_sync_cmd_get_more (cursor->conn, cursor->ns,
ret, cid);
if (!cursor->results)
return FALSE;
mongo_wire_reply_packet_get_header (cursor->results, &cursor->ph);
}
cursor->offset++;
return TRUE;
}
void
mongo_sync_cursor_free (mongo_sync_cursor *cursor)
{
if (!cursor)
{
errno = ENOTCONN;
return;
}
errno = 0;
mongo_sync_cmd_kill_cursors (cursor->conn, 1, cursor->ph.cursor_id);
g_free (cursor->ns);
mongo_wire_packet_free (cursor->results);
g_free (cursor);
}
bson *
mongo_sync_cursor_get_data (mongo_sync_cursor *cursor)
{
bson *r;
if (!cursor)
{
errno = EINVAL;
return NULL;
}
if (!mongo_wire_reply_packet_get_nth_document (cursor->results,
cursor->offset + 1,
&r))
{
errno = ERANGE;
return NULL;
}
bson_finish (r);
return r;
}
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