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/*
This file is part of GNUnet.
Copyright (C) 2009-2013, 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 transport/transport_api.c
* @brief library to obtain our HELLO from our transport service
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_arm_service.h"
#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_transport_service.h"
#include "transport.h"
/**
* Linked list of functions to call whenever our HELLO is updated.
*/
struct GNUNET_TRANSPORT_GetHelloHandle
{
/**
* This is a doubly linked list.
*/
struct GNUNET_TRANSPORT_GetHelloHandle *next;
/**
* This is a doubly linked list.
*/
struct GNUNET_TRANSPORT_GetHelloHandle *prev;
/**
* Transport handle.
*/
struct GNUNET_TRANSPORT_Handle *handle;
/**
* Callback to call once we got our HELLO.
*/
GNUNET_TRANSPORT_HelloUpdateCallback rec;
/**
* Task for calling the HelloUpdateCallback when we already have a HELLO
*/
struct GNUNET_SCHEDULER_Task *notify_task;
/**
* Closure for @e rec.
*/
void *rec_cls;
};
/**
* Task to call the HelloUpdateCallback of the GetHelloHandle
*
* @param cls the `struct GNUNET_TRANSPORT_GetHelloHandle`
*/
static void
call_hello_update_cb_async (void *cls)
{
struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
GNUNET_assert (NULL != ghh->handle->my_hello);
GNUNET_assert (NULL != ghh->notify_task);
ghh->notify_task = NULL;
ghh->rec (ghh->rec_cls,
ghh->handle->my_hello);
}
/**
* Obtain the HELLO message for this peer. The callback given in this function
* is never called synchronously.
*
* @param handle connection to transport service
* @param rec function to call with the HELLO, sender will be our peer
* identity; message and sender will be NULL on timeout
* (handshake with transport service pending/failed).
* cost estimate will be 0.
* @param rec_cls closure for @a rec
* @return handle to cancel the operation
*/
struct GNUNET_TRANSPORT_GetHelloHandle *
GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
GNUNET_TRANSPORT_HelloUpdateCallback rec,
void *rec_cls)
{
struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
hwl = GNUNET_new (struct GNUNET_TRANSPORT_GetHelloHandle);
hwl->rec = rec;
hwl->rec_cls = rec_cls;
hwl->handle = handle;
GNUNET_CONTAINER_DLL_insert (handle->hwl_head,
handle->hwl_tail,
hwl);
if (NULL != handle->my_hello)
hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
hwl);
return hwl;
}
/**
* Stop receiving updates about changes to our HELLO message.
*
* @param ghh handle to cancel
*/
void
GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
{
struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
if (NULL != ghh->notify_task)
GNUNET_SCHEDULER_cancel (ghh->notify_task);
GNUNET_CONTAINER_DLL_remove (handle->hwl_head,
handle->hwl_tail,
ghh);
GNUNET_free (ghh);
}
/* end of transport_api_hello.c */
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