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client.js
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client.js
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const BeaconScanner = require('./node-beacon-scanner/lib/scanner.js');
const noble = require('@abandonware/noble');
const http = require('https');
const options = require("./config/client_config.js");
const utils = require("./utils.js");
const generateEid = require("./ephemeralId").generateEid;
const scanner = new BeaconScanner({noble: noble});
const COMMANDS_PRESENT = "arrived";
const COMMANDS_DEPARTED = "departed";
const defaults = {
"count": 0,
"present": null
};
process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = 0;
let tmp = [];
let registeredBeacons = {};
let names = [];
let PRESENCE_COUNT = 0;
function updatePresence(name, present){
const path = `/update?present=${present}&subject=${name}`;
utils.log(`updating state for ${name} to ${present}`);
return new Promise((resolve, reject) => {
http.get(`${options.host}${path}`, (res) => {
if(res.statusCode === 401){
restart();
reject();
return;
}
if(res.statusCode === 202){
utils.log("state not updated");
reject();
return
}
resolve();
});
});
}
// Set an Event handler for becons
scanner.onadvertisement = (ad) => {
if(ad.beaconType !== 'eddystoneEid'){
return;
}
//const distance = Math.pow(10,( (ad.iBeacon.txPower - ad.rssi) / (10 * 2)));
names.forEach((name) => {
const localEid = generateEid(
registeredBeacons[name].identityKey,
registeredBeacons[name].rotationPeriod
);
if(ad.eddystoneEid.eid === localEid){
if(!registeredBeacons[name].present){
updatePresence(name, true).then(() => {
registeredBeacons[name].present = true;
}).catch(() => utils.log("updatePresence call was rejected"));
}
registeredBeacons[name].count = 0;
}
})
};
const register = () => {
return new Promise((resolve, reject) => {
utils.log("registering to agregator");
http.get(`${options.host}/register`, {
headers: {
authorization: `bearer ${Buffer.from(options.credentials.join(":")).toString('base64')}`
}
}, (res) => {
if(res.statusCode === 200){
let data = '';
res.on("data", (chunk) => {
data += chunk.toString();
});
res.on("end", () => {
utils.log("registered!");
resolve(JSON.parse(data));
});
return;
}
utils.log(res);
utils.log("failed! retry in 1s");
setTimeout(() => resolve(register()), 1000);
}).on("error", (e) => {
utils.log("failed! retry in 1s");
utils.log(e);
setTimeout(() => resolve(register()), 1000);
});
})
};
const startScan = () => {
/**
* Sometimes, on reboot bluetooth interface cannot start.
* @TODO send notification about bluetooth interface not starting
*/
let blActive = false;
setTimeout(() => {
if(!blActive){
stopScan();
utils.log("BL scan could not start. Rebooting");
require('child_process').exec('sudo /sbin/shutdown -r now', function (msg) { utils.log(msg) });
}
}, 1500)
return new Promise((resolve, reject) => {
// Start scanning
scanner.startScan().then(() => {
utils.log('Started to scan.');
intervalManager.startInterval();
blActive = true;
resolve();
}).catch((error) => {
utils.error(new Date(), error);
reject();
});
});
};
const registerBeacons = (subjects) => {
registeredBeacons = Object.keys(subjects).reduce((acc, subject) => {
names.push(subject);
acc[subject] = {
subject,
...subjects[subject].eidSettings,
...defaults
};
return acc;
},{})
}
const stopScan = () => {
return new Promise((resolve, reject) => {
// Stop scanning
scanner.stopScan();
intervalManager.stopInterval();
utils.log('Scan stopped.');
resolve();
});
}
const intervalManager = {
interval: null,
startInterval: function(){
utils.log("Start interval");
this.interval = setInterval(() => {
names.forEach((name) => {
if(registeredBeacons[name].count <= PRESENCE_COUNT){
registeredBeacons[name].count++;
} else if(registeredBeacons[name].present || registeredBeacons[name].present === null){
updatePresence(name, registeredBeacons[name].present === null ? null : false)
.catch(() => {});
registeredBeacons[name].present = false;
}
});
}, 1000);
},
stopInterval: function(){
utils.log("Clear interval");
clearInterval(this.interval);
}
}
const init = () => {
return register().then((subjectsConfig) => {
registerBeacons(subjectsConfig.subjects);
PRESENCE_COUNT = subjectsConfig.PRESENCE_COUNT;
return startScan();
});
};
const restart = () => {
utils.log("Restarting...")
return stopScan().then(() => init());
}
init();