/
server.js
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server.js
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var mqtt = require('mqtt'),
os = require("os"),
fs = require("fs"),
mac = require("getmac"),
express = require("express"),
winston = require('winston'),
dgram = require("dgram"),
conf = process.env;
// Log
var logger = new (winston.Logger)({
transports: [
new (winston.transports.Console)({
level: conf.CONSOLE_LOG_LEVEL || 'verbose',
colorize: true
}),
new (winston.transports.File)({
filename: process.env.AGENT_LOG_FILE || './agent.log',
level: conf.FILE_LOG_LEVEL || 'warn'
})
],
exitOnError: false
});
// Start
logger.info('Configuring agent...');
// Local variables
var account_id, broker_topic;
var device_id = 'd-' + os.hostname().toLowerCase(); // default
logger.info('Device Id: %s', device_id);
// Message endpoint variables
var SERVER_MQTT_PORT = conf.SERVER_MQTT_PORT || 1883;
var SERVER_REST_PORT = conf.SERVER_REST_PORT || 8080;
var SERVER_UDP_PORT = conf.SERVER_UDP_PORT || 41234;
var BROKER_HOST = conf.BROKER_HOST || 'data.enableiot.com';
var BROKER_PORT = conf.BROKER_PORT || 8884;
var BROKER_DATA_TOPIC = conf.BROKER_DATA_TOPIC || "data";
var BROKER_OPTS = {
keyPath: conf.BROKER_HOST_KEY || 'certs/client.key',
certPath: conf.BROKER_HOST_CERT || 'certs/client.crt',
username: conf.BROKER_HOST_USR || 'username',
password: conf.BROKER_HOST_PSW || 'password',
keepalive: 30000
}
mac.getMac(function(err, macAddress){
if (err) logger.error('Unable to get MAC address', err);
device_id = macAddress;
});
var getTimestamp = function(){
return new Date().getTime();
}
var cloneObject = function(obj1){
return JSON.parse(JSON.stringify(obj1));
}
var makeItem = function(name, value){
var item_template = {
"name": "",
"sample": [ { "value": 0, "timestamp": 0 } ]
}
var item = cloneObject(item_template);
item.name = name;
item.sample[0].value = value;
item.sample[0].timestamp = getTimestamp();
return item;
}
var makeMetrics = function(src, val){
if (!val) throw "Null val";
if (!val.metric) throw "Null val.metric";
if (!val.value) throw "Null val.value";
var msg = {
"msg_type": "metrics_msg",
"sender_id": device_id,
"account_id": account_id,
"timestamp": getTimestamp(),
"data_source": [
{
"name": src,
"metrics": []
}
]
};
// Add metrics to the message
msg.data_source[0].metrics[0] = makeItem(val.metric, val.value);
// If in debug than print to console, else send to broker
logger.info('Message: ', msg);
broker.publish(broker_topic, JSON.stringify(msg));
}
// ************************************************************
// Local variables
// ************************************************************
account_id = BROKER_OPTS.username;
broker_topic = BROKER_DATA_TOPIC + "/" + account_id + "/" + device_id
broker = mqtt.createSecureClient(BROKER_PORT, BROKER_HOST, BROKER_OPTS);
// ************************************************************
// REST Server
// ************************************************************
var rest = express();
logger.info('Starting REST broker on %s ...', SERVER_REST_PORT);
rest.configure(function() {
rest.use(express.favicon());
rest.use(express.logger('dev'));
rest.use(express.json());
rest.use(express.urlencoded());
rest.use(express.methodOverride());
rest.use(express.errorHandler());
});
rest.get('/', function (request, response) {
response.json({
namespace: 'sensor',
payload: '{"metric": "metric name", "value"; 0.00}'
});
});
rest.put('/:device', function (request, response) {
var device = request.params.device;
var msg = request.body;
logger.info('REST Topic: %s Payload: ', device, msg);
try {
makeMetrics(device, msg);
response.send(200);
} catch (ex) {
logger.error('Error on rest: %s', ex);
response.send(404);
}
});
rest.listen(SERVER_REST_PORT);
// ************************************************************
// UDP Server
// ************************************************************
var server = dgram.createSocket("udp4");
server.on("error", function (err) {
logger.error('Error on rest: %s', err.stack);
server.close();
});
server.on("message", function (msg, rinfo) {
logger.info('UDP message from %s:%d', rinfo.address, rinfo.port);
try {
var doc = JSON.parse(msg);
if (!doc.src) throw 'UDP: Null src';
else makeMetrics(doc.src, doc);
} catch (ex) {
logger.error('Error on udp: %s', ex);
}
});
server.on("listening", function () {
var addr = server.address();
logger.info('Starting UDP Server on %s:%d', addr.address, addr.port);
});
server.bind(SERVER_UDP_PORT);
// ************************************************************
// MQTT Server
// ************************************************************
logger.info('Starting MQTT broker on %s ...', SERVER_MQTT_PORT);
mqtt.createServer(function(client) {
logger.info('Server created...');
client.on('connect', function(packet) {
client.connack({returnCode: 0});
client.id = packet.clientId;
logger.info('MQTT Client connected: %s', packet.clientId);
});
client.on('publish', function(packet) {
logger.info('MQTT Topic: %s Payload: %s', packet.topic, packet.payload);
makeMetrics(packet.topic, JSON.parse(packet.payload));
});
client.on('pingreq', function(packet) {
client.pingresp();
});
client.on('disconnect', function(packet) {
client.stream.end();
});
client.on('error', function(err) {
client.stream.end();
logger.error('MQTT Error: %s', err);
});
}).listen(SERVER_MQTT_PORT);