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A simple program for reliably sending a file to all neihgboring nodes

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adamdunkels 2007-03-20 12:25:27 +00:00
parent 404c2cc0a3
commit a43c213ff2
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apps/rudolph/Makefile.rudolph Normal file
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APP_SOURCES += rudolph0.c

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apps/rudolph/rudolph0.c Normal file
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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: rudolph0.c,v 1.1 2007/03/20 12:25:27 adamdunkels Exp $
*/
/**
* \file
* Rudolph0: a simple block data flooding protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime.h"
#include "rudolph0.h"
#include "cfs/cfs.h"
#include <stddef.h> /* for offsetof */
#define SENDING_TIME CLOCK_SECOND / 2
#define STEADY_TIME CLOCK_SECOND * 2
enum {
TYPE_DATA,
TYPE_NACK,
};
enum {
STATE_RECEIVER,
STATE_SENDER,
};
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
read_new_datapacket(struct rudolph0_conn *c)
{
int len;
len = cfs_read(c->cfs_fd, c->current.data, RUDOLPH0_DATASIZE);
c->current.datalen = len;
PRINTF("read_new_datapacket len %d\n", c->current.datalen);
}
/*---------------------------------------------------------------------------*/
static void
send_nack(struct rudolph0_conn *c)
{
struct rudolph0_hdr *hdr;
rimebuf_clear();
rimebuf_hdrextend(sizeof(struct rudolph0_hdr));
hdr = rimebuf_hdrptr();
hdr->type = TYPE_NACK;
hdr->version = c->current.h.version;
hdr->chunk = c->current.h.chunk;
PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
uabc_send(&c->nackc, CLOCK_SECOND / 4);
}
/*---------------------------------------------------------------------------*/
static void
sent(struct sabc_conn *sabc)
{
struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
if(c->current.datalen == RUDOLPH0_DATASIZE) {
c->current.h.chunk++;
PRINTF("Sending data chunk %d next time\n", c->current.h.chunk);
read_new_datapacket(c);
} else {
sabc_set_timer(&c->c, STEADY_TIME);
PRINTF("Sending the same data chunk next time datalen %d, %d\n",
c->current.datalen, RUDOLPH0_DATASIZE);
}
}
/*---------------------------------------------------------------------------*/
static void
recv(struct sabc_conn *sabc)
{
struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
struct rudolph0_datapacket *p = rimebuf_dataptr();
/* if(rand() & 1) {
return;
}*/
if(p->h.type == TYPE_DATA) {
if(p->h.version > c->current.h.version) {
PRINTF("rudolph0 new version %d\n", p->h.version);
c->cfs_fd = c->cb->new_file(c);
c->current.h.version = p->h.version;
c->current.h.chunk = 0;
if(c->cfs_fd != -1) {
if(p->h.chunk != 0) {
send_nack(c);
} else {
cfs_write(c->cfs_fd, p->data, p->datalen);
c->current.h.chunk++;
}
}
} else if(p->h.version == c->current.h.version) {
if(c->cfs_fd != -1) {
if(p->h.chunk == c->current.h.chunk) {
PRINTF("received chunk %d\n", p->h.chunk);
cfs_write(c->cfs_fd, p->data, p->datalen);
c->current.h.chunk++;
if(p->datalen < RUDOLPH0_DATASIZE) {
c->cb->received_file(c, c->cfs_fd);
}
} else if(p->h.chunk > c->current.h.chunk) {
PRINTF("received chunk %d > %d, sending NACK\n", p->h.chunk, c->current.h.chunk);
send_nack(c);
}
}
} else { /* p->h.version < c->current.h.version */
/* Ignore packets with old version */
}
}
}
/*---------------------------------------------------------------------------*/
static void
recv_nack(struct uabc_conn *uabc)
{
struct rudolph0_conn *c = (struct rudolph0_conn *)
((char *)uabc - offsetof(struct rudolph0_conn,
nackc));
struct rudolph0_datapacket *p = rimebuf_dataptr();
if(p->h.type == TYPE_NACK && c->state == STATE_SENDER) {
if(p->h.version == c->current.h.version) {
PRINTF("Reseting chunk to %d\n", p->h.chunk);
c->current.h.chunk = p->h.chunk;
cfs_seek(c->cfs_fd, c->current.h.chunk * RUDOLPH0_DATASIZE);
} else {
PRINTF("Wrong version, reseting chunk to 0\n");
c->current.h.chunk = 0;
cfs_seek(c->cfs_fd, 0);
}
read_new_datapacket(c);
sabc_set_timer(&c->c, SENDING_TIME);
}
}
/*---------------------------------------------------------------------------*/
static const struct uabc_callbacks uabc = { recv_nack, NULL, NULL };
static const struct sabc_callbacks sabc = { recv, sent };
/*---------------------------------------------------------------------------*/
void
rudolph0_open(struct rudolph0_conn *c, u16_t channel,
const struct rudolph0_callbacks *cb)
{
sabc_open(&c->c, channel, &sabc);
uabc_open(&c->nackc, channel + 1, &uabc);
c->cb = cb;
c->current.h.version = 0;
c->state = STATE_RECEIVER;
}
/*---------------------------------------------------------------------------*/
void
rudolph0_close(struct rudolph0_conn *c)
{
sabc_close(&c->c);
uabc_close(&c->nackc);
}
/*---------------------------------------------------------------------------*/
void
rudolph0_send(struct rudolph0_conn *c, int cfs_fd)
{
c->state = STATE_SENDER;
c->cfs_fd = cfs_fd;
c->current.h.version++;
c->current.h.chunk = 0;
c->current.h.type = TYPE_DATA;
read_new_datapacket(c);
rimebuf_reference(&c->current, sizeof(struct rudolph0_datapacket));
sabc_send_stubborn(&c->c, SENDING_TIME);
}
/*---------------------------------------------------------------------------*/

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apps/rudolph/rudolph0.h Normal file
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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: rudolph0.h,v 1.1 2007/03/20 12:25:27 adamdunkels Exp $
*/
/**
* \file
* A brief description of what this file is.
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __RUDOLPH0_H__
#define __RUDOLPH0_H__
#include "net/rime.h"
#include "net/rime/sabc.h"
#include "net/rime/uabc.h"
#include "contiki-net.h"
struct rudolph0_conn;
struct rudolph0_callbacks {
int (* new_file)(struct rudolph0_conn *c);
void (* received_file)(struct rudolph0_conn *c, int cfs_fd);
};
#define RUDOLPH0_DATASIZE 32
struct rudolph0_hdr {
u8_t type;
u8_t version;
u16_t chunk;
};
struct rudolph0_datapacket {
struct rudolph0_hdr h;
u8_t datalen;
u8_t data[RUDOLPH0_DATASIZE];
};
struct rudolph0_conn {
struct sabc_conn c;
struct uabc_conn nackc;
const struct rudolph0_callbacks *cb;
int cfs_fd;
u8_t state;
struct rudolph0_datapacket current;
};
void rudolph0_open(struct rudolph0_conn *c, u16_t channel,
const struct rudolph0_callbacks *cb);
void rudolph0_close(struct rudolph0_conn *c);
void rudolph0_send(struct rudolph0_conn *c, int cfs_fd);
#endif /* __RUDOLPH0_H__ */