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/*
This file is part of GNUnet
Copyright (C) 2012, 2013, 2016 GNUnet e.V.
GNUnet 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, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file regex/regex_api_announce.c
* @brief access regex service to advertise capabilities via regex
* @author Maximilian Szengel
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_protocols.h"
#include "gnunet_util_lib.h"
#include "gnunet_regex_service.h"
#include "regex_ipc.h"
#define LOG(kind,...) GNUNET_log_from (kind, "regex-api",__VA_ARGS__)
/**
* Handle to store cached data about a regex announce.
*/
struct GNUNET_REGEX_Announcement
{
/**
* Connection to the regex service.
*/
struct GNUNET_MQ_Handle *mq;
/**
* Our configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Message we're sending to the service.
*/
char *regex;
/**
* Frequency of announcements.
*/
struct GNUNET_TIME_Relative refresh_delay;
/**
* Number of characters per edge.
*/
uint16_t compression;
};
/**
* (Re)connect to the REGEX service with the given announcement @a a.
*
* @param a REGEX to announce.
*/
static void
announce_reconnect (struct GNUNET_REGEX_Announcement *a);
/**
* We got a disconnect after asking regex to do the announcement.
* Retry.
*
* @param cls the `struct GNUNET_REGEX_Announcement` to retry
* @param error error code
*/
static void
announce_mq_error_handler (void *cls,
enum GNUNET_MQ_Error error)
{
struct GNUNET_REGEX_Announcement *a = cls;
GNUNET_MQ_destroy (a->mq);
a->mq = NULL;
announce_reconnect (a);
}
/**
* (Re)connect to the REGEX service with the given announcement @a a.
*
* @param a REGEX to announce.
*/
static void
announce_reconnect (struct GNUNET_REGEX_Announcement *a)
{
struct GNUNET_MQ_Envelope *env;
struct AnnounceMessage *am;
size_t slen;
a->mq = GNUNET_CLIENT_connect (a->cfg,
"regex",
NULL,
&announce_mq_error_handler,
a);
if (NULL == a->mq)
return;
slen = strlen (a->regex) + 1;
env = GNUNET_MQ_msg_extra (am,
slen,
GNUNET_MESSAGE_TYPE_REGEX_ANNOUNCE);
am->compression = htons (a->compression);
am->reserved = htons (0);
am->refresh_delay = GNUNET_TIME_relative_hton (a->refresh_delay);
GNUNET_memcpy (&am[1],
a->regex,
slen);
GNUNET_MQ_send (a->mq,
env);
}
/**
* Announce the given peer under the given regular expression.
*
* @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)
{
struct GNUNET_REGEX_Announcement *a;
size_t slen;
slen = strlen (regex) + 1;
if (slen + sizeof (struct AnnounceMessage) >= GNUNET_MAX_MESSAGE_SIZE)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Regex `%s' is too long!\n"),
regex);
GNUNET_break (0);
return NULL;
}
a = GNUNET_new (struct GNUNET_REGEX_Announcement);
a->cfg = cfg;
a->refresh_delay = refresh_delay;
a->compression = compression;
a->regex = GNUNET_strdup (regex);
announce_reconnect (a);
if (NULL == a->mq)
{
GNUNET_free (a->regex);
GNUNET_free (a);
return NULL;
}
return a;
}
/**
* 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)
{
GNUNET_MQ_destroy (a->mq);
GNUNET_free (a->regex);
GNUNET_free (a);
}
/* end of regex_api_announce.c */
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