datagram_service.c
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2014 Georg Hopp
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdarg.h>
#include <stdint.h>
#include <sys/types.h>
#include "trbase.h"
#include "trio.h"
#include "trdata.h"
#include "tr/datagram_service.h"
#include "tr/interface/protocol.h"
#include "tr/interface/comm_end_point.h"
static
int
datagramServiceCtor(void * _this, va_list * params)
{
TR_PARENTCALL(TR_DatagramService, _this, TR_Class, ctor, params);
return 0;
}
static
void
datagramServiceDtor(void * _this)
{
TR_PARENTCALL(TR_DatagramService, _this, TR_Class, dtor);
}
static
TR_ProtoMessage
datagramServiceNextMessage(void * _this, TR_RemoteData * data)
{
TR_CommEndPoint comm = _this;
TR_ProtoMessage ret_message = NULL;
TR_RemoteData new_data = NULL;
if (*data) {
ret_message = TR_protoCreateMessage(comm->protocol, (*data)->remote);
new_data = TR_protoParse(comm->protocol, ret_message, *data);
/*
* In UDP I don't care about remaining data. UDP is an all or nothing
* approach. If the parser is unable to create a message from the data I
* drop the data.
* Here the protocol must not free the data if it does not create a
* complete message from it. If a message was created the original data
* might or might not traval with the created message. In any case the
* protocol is then responsible for freeing the data.
*/
if (! ret_message->ready) {
TR_delete(ret_message);
if (new_data) {
TR_delete(new_data);
TR_delete(*data);
}
}
*data = NULL;
}
return ret_message;
}
static
size_t
datagramServiceCompose(void * _this, TR_ProtoMessage message)
{
TR_RemoteData data =
TR_protoCompose(((TR_CommEndPoint)_this)->protocol, message);
if (data->remote->handle == -1) {
data->free_remote = 1;
}
if (! data) {
return FALSE;
}
TR_queuePut(((TR_CommEndPoint)_this)->write_buffer, data);
return ((TR_SizedData)data)->size;
}
intptr_t datagramService_events[TR_CEP_EVENT_MAX + 1];
TR_INIT_IFACE(TR_Class, datagramServiceCtor, datagramServiceDtor, NULL);
TR_INIT_IFACE(
TR_CommEndPoint,
datagramServiceNextMessage,
datagramServiceCompose);
TR_CREATE_CLASS(
TR_DatagramService,
TR_CommEndPoint,
NULL,
TR_IF(TR_Class),
TR_IF(TR_CommEndPoint)) = {
{{
NULL,
TR_CEP_EVENT_MAX + 1,
datagramService_events
}}
};
// vim: set ts=4 sw=4: