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NetDB: a simple DBMS application using Rime's Mesh protocol to transfer queries and responses.

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nvt 2011-12-06 20:27:41 +01:00
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examples/antelope/netdb/netdb-server.c Normal file
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/*
* Copyright (c) 2011, 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.
*/
/**
* \file
* A small command-line interface for the querying remote database systems.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#include <stdio.h>
#include "contiki.h"
#include "dev/serial-line.h"
#include "dev/sht11.h"
#include "lib/random.h"
#include "net/rime.h"
#include "net/rime/mesh.h"
#include "antelope.h"
/*---------------------------------------------------------------------------*/
/* Sampling interval in Hz. */
#ifndef SAMPLING_INTERVAL
#define SAMPLING_INTERVAL 60
#endif
#ifndef RESPONSE_LIMIT
#define RESPONSE_LIMIT 1000
#endif
#ifndef PREPARE_DB
#define PREPARE_DB 1
#endif
#ifndef CARDINALITY
#define CARDINALITY 1000
#endif
#define MAX_BUFFER_SIZE 80
#define NETDB_CHANNEL 70
/*---------------------------------------------------------------------------*/
PROCESS(netdb_process, "NetDB");
AUTOSTART_PROCESSES(&netdb_process);
static struct mesh_conn mesh;
static rimeaddr_t reply_addr;
static uint8_t buffer_offset;
static char buffer[MAX_BUFFER_SIZE];
/*---------------------------------------------------------------------------*/
static void
send_buffered_data(void)
{
if(buffer_offset > 0) {
packetbuf_copyfrom(buffer, buffer_offset);
mesh_send(&mesh, &reply_addr);
buffer_offset = 0;
}
}
/*---------------------------------------------------------------------------*/
static int
buffer_db_data(const char *format, ...)
{
va_list ap;
size_t len;
char tmp[MAX_BUFFER_SIZE + 1];
va_start(ap, format);
len = vsnprintf(tmp, sizeof(tmp), format, ap);
va_end(ap);
if(len < 0) {
return -1;
}
if(len + buffer_offset > sizeof(buffer)) {
send_buffered_data();
}
memcpy(&buffer[buffer_offset], tmp, len);
buffer_offset += len;
return len;
}
/*---------------------------------------------------------------------------*/
static void
take_sample(void)
{
unsigned seconds;
unsigned humidity;
seconds = clock_seconds();
humidity = /*sht11_humidity()*/ random_rand();
if(DB_ERROR(db_query(NULL, "INSERT (%u, %u) INTO samples;",
seconds, humidity))) {
printf("DB insertion failed\n");
}
}
/*---------------------------------------------------------------------------*/
static void
stop_handler(void *ptr)
{
printf("END\n");
}
/*---------------------------------------------------------------------------*/
PROCESS(query_process, "Query process");
PROCESS_THREAD(query_process, ev, data)
{
static db_handle_t handle;
db_result_t result;
static tuple_id_t matching;
static tuple_id_t processed;
#if !PREPARE_DB
static struct etimer sampling_timer;
#endif
static unsigned i, errors;
PROCESS_BEGIN();
printf("NetDB host\n");
db_init();
db_set_output_function(buffer_db_data);
db_query(NULL, "REMOVE RELATION samples;");
db_query(NULL, "CREATE RELATION samples;");
db_query(NULL, "CREATE ATTRIBUTE time DOMAIN INT IN samples;");
db_query(NULL, "CREATE ATTRIBUTE hum DOMAIN INT IN samples;");
db_query(NULL, "CREATE INDEX samples.time TYPE INLINE;");
#if PREPARE_DB
printf("Preparing the DB with %d tuples...\n", CARDINALITY);
errors = 0;
for(i = 1; i <= CARDINALITY; i++) {
PROCESS_PAUSE();
result = db_query(NULL, "INSERT (%u, %u) INTO samples;",
i, (unsigned)random_rand());
if(DB_ERROR(result)) {
errors++;
}
}
printf("Done. Insertion errors: %d\n", errors);
printf("Ready to process queries\n");
#else
etimer_set(&sampling_timer, SAMPLING_INTERVAL * CLOCK_SECOND);
#endif
for(;;) {
PROCESS_WAIT_EVENT();
if(ev == serial_line_event_message && data != NULL) {
printf("START %s\n", (char *)data);
result = db_query(&handle, data);
if(DB_ERROR(result)) {
buffer_db_data("Query error: %s\n", db_get_result_message(result));
stop_handler(NULL);
db_free(&handle);
continue;
}
if(!db_processing(&handle)) {
buffer_db_data("OK\n");
send_buffered_data();
stop_handler(NULL);
continue;
}
packetbuf_set_attr(PACKETBUF_ATTR_PACKET_TYPE,
PACKETBUF_ATTR_PACKET_TYPE_STREAM);
db_print_header(&handle);
matching = 0;
processed = 0;
while(db_processing(&handle)) {
PROCESS_PAUSE();
if(matching == RESPONSE_LIMIT) {
buffer_db_data("Response suppressed at %u tuples: limit reached\n",
RESPONSE_LIMIT);
stop_handler(NULL);
db_free(&handle);
break;
}
result = db_process(&handle);
if(result == DB_GOT_ROW) {
/* The processed tuple matched the condition in the query. */
matching++;
processed++;
db_print_tuple(&handle);
} else if(result == DB_OK) {
/* A tuple was processed, but did not match the condition. */
processed++;
continue;
} else {
if(result == DB_FINISHED) {
/* The processing has finished. Wait for a new command. */
buffer_db_data("[%ld tuples returned; %ld tuples processed]\n",
(long)matching, (long)processed);
buffer_db_data("OK\n");
} else if(DB_ERROR(result)) {
buffer_db_data("Processing error: %s\n",
db_get_result_message(result));
}
stop_handler(NULL);
db_free(&handle);
}
}
send_buffered_data();
}
#if !PREPARE_DB
if(etimer_expired(&sampling_timer)) {
take_sample();
etimer_reset(&sampling_timer);
}
#endif
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
static void
sent(struct mesh_conn *c)
{
}
static void
timedout(struct mesh_conn *c)
{
printf("packet time out\n");
}
static void
received(struct mesh_conn *c, const rimeaddr_t *from, uint8_t hops)
{
char *data;
unsigned len;
static char query[MAX_BUFFER_SIZE + 1];
data = (char *)packetbuf_dataptr();
len = packetbuf_datalen();
if(len > MAX_BUFFER_SIZE) {
buffer_db_data("Too long query: %d bytes\n", len);
return;
}
memcpy(query, data, len);
query[len] = '\0';
printf("Query received from %d.%d: %s (%d hops)\n",
from->u8[0], from->u8[1], query, (int)hops);
rimeaddr_copy(&reply_addr, from);
process_post(&query_process, serial_line_event_message, query);
}
static const struct mesh_callbacks callbacks = {received, sent, timedout};
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(netdb_process, ev, data)
{
PROCESS_EXITHANDLER(mesh_close(&mesh));
PROCESS_BEGIN();
mesh_open(&mesh, NETDB_CHANNEL, &callbacks);
process_start(&query_process, NULL);
PROCESS_END();
}