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/*
This file is part of GNUnet
Copyright (C) 2012, 2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
*/
/**
* @author Maximilian Szengel
* @author Christian Grothoff
*
* @file
* API to access regex service to advertise capabilities via regex and discover
* respective peers using matching strings
*
* @defgroup regex RegEx service
* Advertise capabilities via RegEx and discover
* respective peers using matching strings.
*
* @see [Documentation](https://gnunet.org/regex)
*
* @{
*/
#ifndef GNUNET_REGEX_SERVICE_H
#define GNUNET_REGEX_SERVICE_H
#include "gnunet_util_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Constant for how many bytes the initial string regex should have.
*/
#define GNUNET_REGEX_INITIAL_BYTES 24
/**
* Handle to store cached data about a regex announce.
*/
struct GNUNET_REGEX_Announcement;
/**
* Handle to store data about a regex search.
*/
struct GNUNET_REGEX_Search;
/**
* Announce this peer under the given regular expression. Does
* not free resources, must call #GNUNET_REGEX_announce_cancel for
* that.
*
* @param cfg configuration to use
* @param regex Regular expression to announce.
* @param refresh_delay after what delay should the announcement be repeated?
* @param compression How many characters per edge can we squeeze?
* @return Handle to reuse o free cached resources.
* Must be freed by calling #GNUNET_REGEX_announce_cancel.
*/
struct GNUNET_REGEX_Announcement *
GNUNET_REGEX_announce (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *regex,
struct GNUNET_TIME_Relative refresh_delay,
uint16_t compression);
/**
* Stop announcing the regex specified by the given handle.
*
* @param a handle returned by a previous #GNUNET_REGEX_announce call.
*/
void
GNUNET_REGEX_announce_cancel (struct GNUNET_REGEX_Announcement *a);
/**
* Search callback function, invoked for every result that was found.
*
* @param cls Closure provided in #GNUNET_REGEX_search.
* @param id Peer providing a regex that matches the string.
* @param get_path Path of the get request.
* @param get_path_length Lenght of @a get_path.
* @param put_path Path of the put request.
* @param put_path_length Length of the @a put_path.
*/
typedef void
(*GNUNET_REGEX_Found)(void *cls,
const struct GNUNET_PeerIdentity *id,
const struct GNUNET_PeerIdentity *get_path,
unsigned int get_path_length,
const struct GNUNET_PeerIdentity *put_path,
unsigned int put_path_length);
/**
* Search for a peer offering a regex matching certain string in the DHT.
* The search runs until #GNUNET_REGEX_search_cancel is called, even if results
* are returned.
*
* @param cfg configuration to use
* @param string String to match against the regexes in the DHT.
* @param callback Callback for found peers.
* @param callback_cls Closure for @c callback.
* @return Handle to stop search and free resources.
* Must be freed by calling #GNUNET_REGEX_search_cancel.
*/
struct GNUNET_REGEX_Search *
GNUNET_REGEX_search (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *string,
GNUNET_REGEX_Found callback,
void *callback_cls);
/**
* Stop search and free all data used by a #GNUNET_REGEX_search call.
*
* @param s Handle returned by a previous #GNUNET_REGEX_search call.
*/
void
GNUNET_REGEX_search_cancel (struct GNUNET_REGEX_Search *s);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif
/** @} */ /* end of group */
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