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index.js
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index.js
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#!/usr/bin/env node
const mosca = require('mosca');
const ArgumentParser = require('argparse').ArgumentParser;
const persist = require('node-persist');
const axios = require('axios');
const moment = require('moment');
const mqtt = require('mqtt');
const storage = persist.create({dir: 'data', ttl: 3500000});
const parser = new ArgumentParser({
version: '1.0.8',
addHelp:true,
description: 'gsi4mqtt broker'
});
parser.addArgument(
[ '--verbose' ],
{
help: 'Set true for verbose debugging output '
}
);
parser.addArgument(
[ '-z', '--zip' ],
{
help: 'Zipcode (Postleitzahl) in Germany'
}
);
parser.addArgument(
[ '-p', '--port' ],
{
help: 'Runs MQTT Broker on given port (default 1883)'
}
);
parser.addArgument(
[ '-c', '--client' ],
{
help: 'Publishes to remote broker - act as client specify mqtt URI'
}
);
const args = parser.parseArgs();
let brokerPort = 1883;
if(args.port != null) { brokerPort = args.port *1 };
let zipCode = '69256';
if(args.zip != null) { zipCode = args.zip };
let verbose = false;
if(args.verbose != null) { verbose = true };
let client = null;
if(args.client != null) {
client = mqtt.connect(args.client);
}
const moscaSettings = {
port: brokerPort,
backend: {
type: 'filesystem',
json: false,
qlobber_fsq: require("qlobber-fsq"),
fsq_dir: "data/mqtt"
}
};
const getGSI = async function() {
let gsi = await storage.getItem('gsi');
if(gsi == null) {
let responds = await axios.get('https://api.corrently.io/core/gsi?zip='+zipCode);
gsi = responds.data;
storage.setItem('gsi',gsi);
return gsi;
} else {
return gsi;
}
}
const publishMessage = async function(topic,value) {
return new Promise((resolve, reject) => {
let message = {
topic: topic,
payload: ''+value,
qos: 0,
retain: true
};
server.publish(message, function() {
if(client!=null) {
client.publish(topic,''+value);
resolve();
} else {
if(verbose) {
console.log('Published',message);
}
resolve();
}
});
})
}
const publishGSI = async function(gsi) {
let now = new Date().getTime();
let matrix = {}
await publishMessage('/now',gsi.forecast[0].gsi);
await publishMessage('/now/isostring',moment(gsi.forecast[0].timeStamp).format());
let min = 100;
let max = 0;
let min_ts =0;
let max_ts =0;
let switches = [];
for(let i=0;i<gsi.forecast.length;i++) {
await publishMessage('/timestamp/'+gsi.forecast[i].timeStamp,gsi.forecast[i].gsi);
if(gsi.forecast[i].timeStamp > now) {
await publishMessage('/relativeHours/'+Math.floor((gsi.forecast[i].timeStamp-now)/3600000),gsi.forecast[i].gsi);
}
if(i<24) {
switches.push(gsi.forecast[i]);
if(min > gsi.forecast[i].gsi) {
min = gsi.forecast[i].gsi;
min_ts = gsi.forecast[i].timeStamp;
}
if(max < gsi.forecast[i].gsi) {
max = gsi.forecast[i].gsi;
max_ts = gsi.forecast[i].timeStamp;
}
}
// calcultate matrix
matrix['h_'+i] = {
timeStamp: gsi.forecast[i].timeStamp
};
let sum = 0;
let t = 0;
for(let j = i;j>0;j--) {
sum += gsi.forecast[j].gsi;
t++;
matrix['h_'+i]['avg_'+j] = Math.round(sum/(t));
}
for(let j = i+1; j<gsi.forecast.length; j++) {
matrix['h_'+i]['avg_'+j] = false;
}
}
switches.sort(function(a,b) {
if (a.gsi > b.gsi) return 1;
if (b.gsi > a.gsi) return -1;
return 0;
});
switches = switches.reverse();
let latest_gsi = gsi.forecast[0].gsi;
for(let i=0;i<switches.length;i++) {
if(switches[i].gsi >= latest_gsi) {
await publishMessage('/bestHours/'+i+'/string','off');
await publishMessage('/bestHours/'+i,0);
} else {
await publishMessage('/bestHours/'+i+'/string','on');
await publishMessage('/bestHours/'+i,1);
}
}
await publishMessage('/min/isostring',moment(min_ts).format());
await publishMessage('/min',min);
await publishMessage('/min/timestamp',min_ts);
await publishMessage('/max/isostring',moment(max_ts).format());
await publishMessage('/max/timestamp',max_ts);
await publishMessage('/max',max);
for(let z=1;z<24;z++) {
let maxGsi = 0;
let timeStamp = 0;
for(let i=z-1;(i<24);i++) {
if(matrix['h_'+i]['avg_'+z] > maxGsi) {
maxGsi = matrix['h_'+i]['avg_'+z];
timeStamp = matrix['h_'+i].timeStamp;
}
}
await publishMessage('/forHoursIn24/'+z,timeStamp);
await publishMessage('/forHoursIn24/'+z+'/timestamp',timeStamp);
await publishMessage('/forHoursIn24/'+z+'/isostring',moment(timeStamp).format());
}
console.log(new Date(),'Published');
}
const setup = async function() {
await storage.init();
console.log('MQTT Broker running on',brokerPort);
console.log('Serving Grünstromindex for ZIP',zipCode);
// initial Publish of Messages on Broker start
publishGSI(await getGSI());
// ensure Republish of GSI values every 15 minutes
let karmaInterval = setInterval(async function() {
publishGSI(await getGSI());
},900000);
// ensure Republish of GSI values at the hour
let now = new Date();
let nextHr = new Date(new Date().getTime()+3600000).setMinutes(0,0,0);
setTimeout(async function() {
publishGSI(await getGSI());
clearInterval(karmaInterval);
setInterval(async function() {
publishGSI(await getGSI());
},900000);
},nextHr-now);
console.log("Sample Topics Served:");
console.log(" mqtt://localhost:"+brokerPort+"/now - Current GSI Value");
console.log(" mqtt://localhost:"+brokerPort+"/min - Minimum GSI Value in next 24 hours");
console.log(" mqtt://localhost:"+brokerPort+"/max/isostring - ISO 8601 encoded Time of maximum GSI Value");
console.log(" mqtt://localhost:"+brokerPort+"/forHoursIn24/3 - Timestamp of best 3 hours in row within next 24");
console.log(" mqtt://localhost:"+brokerPort+"/forHoursIn24/4/isostring - ISO 8601 encoded String of best 3 hours in row within next 24 (start)");
console.log(" mqtt://localhost:"+brokerPort+"/relativeHours/5 - GSI Value in 5 hours");
console.log(" mqtt://localhost:"+brokerPort+"/bestHours/3 - Use as switch. Will have value of 1 during the best 3 hours within next 24");
}
const fs = require("fs");
if (!fs.existsSync("data/")) {
fs.mkdirSync("data/");
}
const server = new mosca.Server(moscaSettings);
const mqttpersistence = new mosca.persistence.Memory();
mqttpersistence.wire(server);
server.on('ready', setup);