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/*
This file is part of TALER
Copyright (C) 2019-2021 Taler Systems SA
TALER 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, or (at your option) any later version.
TALER 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.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mhd_run.c
* @brief API for running an MHD daemon with the
* GNUnet scheduler
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include "taler_util.h"
#include "taler_mhd_lib.h"
/**
* Set to true if we should immediately MHD_run() again.
*/
static bool triggered;
/**
* Task running the HTTP server.
*/
static struct GNUNET_SCHEDULER_Task *mhd_task;
/**
* The MHD daemon we are running.
*/
static struct MHD_Daemon *mhd;
/**
* Function that queries MHD's select sets and
* starts the task waiting for them.
*/
static struct GNUNET_SCHEDULER_Task *
prepare_daemon (void);
/**
* Call MHD to process pending requests and then go back
* and schedule the next run.
*
* @param cls NULL
*/
static void
run_daemon (void *cls)
{
(void) cls;
mhd_task = NULL;
do {
triggered = false;
GNUNET_assert (MHD_YES ==
MHD_run (mhd));
} while (triggered);
mhd_task = prepare_daemon ();
}
/**
* Function that queries MHD's select sets and starts the task waiting for
* them.
*
* @return task handle for the MHD task.
*/
static struct GNUNET_SCHEDULER_Task *
prepare_daemon (void)
{
struct GNUNET_SCHEDULER_Task *ret;
fd_set rs;
fd_set ws;
fd_set es;
struct GNUNET_NETWORK_FDSet *wrs;
struct GNUNET_NETWORK_FDSet *wws;
int max;
MHD_UNSIGNED_LONG_LONG timeout;
int haveto;
struct GNUNET_TIME_Relative tv;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
wrs = GNUNET_NETWORK_fdset_create ();
wws = GNUNET_NETWORK_fdset_create ();
max = -1;
GNUNET_assert (MHD_YES ==
MHD_get_fdset (mhd,
&rs,
&ws,
&es,
&max));
haveto = MHD_get_timeout (mhd,
&timeout);
if (haveto == MHD_YES)
tv = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
timeout);
else
tv = GNUNET_TIME_UNIT_FOREVER_REL;
GNUNET_NETWORK_fdset_copy_native (wrs,
&rs,
max + 1);
GNUNET_NETWORK_fdset_copy_native (wws,
&ws,
max + 1);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Adding run_daemon select task\n");
ret = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_HIGH,
tv,
wrs,
wws,
&run_daemon,
NULL);
GNUNET_NETWORK_fdset_destroy (wrs);
GNUNET_NETWORK_fdset_destroy (wws);
return ret;
}
void
TALER_MHD_daemon_start (struct MHD_Daemon *daemon)
{
GNUNET_assert (NULL == mhd);
mhd = daemon;
mhd_task = prepare_daemon ();
}
struct MHD_Daemon *
TALER_MHD_daemon_stop (void)
{
struct MHD_Daemon *ret;
if (NULL != mhd_task)
{
GNUNET_SCHEDULER_cancel (mhd_task);
mhd_task = NULL;
}
ret = mhd;
mhd = NULL;
return ret;
}
void
TALER_MHD_daemon_trigger (void)
{
if (NULL != mhd_task)
{
GNUNET_SCHEDULER_cancel (mhd_task);
mhd_task = GNUNET_SCHEDULER_add_now (&run_daemon,
NULL);
}
else
{
triggered = true;
}
}
/* end of mhd_run.c */
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