Migliorato segnalazione grandi eventi

lib/bot.js

@@ -11,10 +11,32 @@ const geocoding = require('./maps').geocoding;
 const Card = require('./maps').Card;
 const social = require('./social');
 
+const BROADCAST_ALWAYS = config('ingv').broadcastAlways;
 const BROADCAST_THRESHOLD = config('ingv').broadcastThreshold;
+const BROADCAST_RADIUS = config('ingv').broadcastRadius;
 const SOCIAL_THRESHOLD = config('social').threshold;
 const SOCIAL_ENABLED = config('social').enabled;
 
+function _distanceFromCenter(lat, lon) {
+ let lat1 = 41.2909725; // "Center" of
+ let lon1 = 12.572917; // Italy
+ let lat2 = lat;
+ let lon2 = lon;
+
+ let R = 6371e3;
+ let p1 = lat1 * Math.PI/180; // φ, λ in radians
+ let p2 = lat2 * Math.PI/180;
+ let dp = (lat2-lat1) * Math.PI/180;
+ let dl = (lon2-lon1) * Math.PI/180;
+
+ let a = Math.sin(dp/2) * Math.sin(dp/2) +
+ Math.cos(p1) * Math.cos(p2) *
+ Math.sin(dl/2) * Math.sin(dl/2);
+ let c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
+
+ return R * c / 1000; // in km
+}
+
 // Create the HTTP server for handling tg messages
 let serverPort = config('telegram').serverPort;
 let server = new TelegramServer({ port: serverPort });
@@ -43,48 +65,48 @@ let poller = new IngvPoller(options);
 // That must be notified
 poller.on('earthquakes', (earthquakes) => {
  logger.info(`Notifying ${earthquakes.length} events`);
- 
+
  // Loop through them
  async.eachSeries(earthquakes, (ev, callback) => {
  logger.info('New event', ev);
- 
+
  let { lat, lon } = ev['origin'];
  let magnitude = ev['magnitude']['value'];
- 
+
  logger.info(`Reverse geocoding for event <${ev.id}>`);
- 
+
  // Convert the geographical coordinates to a city name (reverse geocoding)
  geocoding.reverse(lat, lon, (err, result) => {
  if (err) ; // TODO: do something, please
- 
+
  let city;
  if (result) {
  city = result['name'];
  }
  else {
  city = ev['zone'];
  }
- 
+
  ev['city'] = city;
  // Update the db representation of the event
  db.history.setCity(ev['id'], city);
- 
+
  // Generate the image card
  let card = new Card(ev);
  card.generate((err, filePath) => {
  if (!err && filePath) {
  ev['cardPath'] = filePath;
  }
 
- if (magnitude >= BROADCAST_THRESHOLD &&
- // broadcast only if we're sure that the country is Italy
- result && result['country'] == 'IT') {
+ if (magnitude >= BROADCAST_ALWAYS ||
+ // broadcast only if the earthquake is >= BROADCAST_THRESHOLD and it is in a radius with Italy in the center
+ (magnitude >= BROADCAST_THRESHOLD && _distanceFromCenter(lat, lon) <= BROADCAST_RADIUS) ) {
  notifications.broadcast(ev, callback);
  }
- else {
+ else { // FIXME: this "else" means no notifications will be sent if someone is not interested in broadcast but that earthquake is near in his radius. Eg: There's an earthquake of magnitude 9 in Milan, if I'm interested in earthquakes near Milan but not in "big earthquake events" I will not be signaled
  notifications.send(ev, callback);
  }
- 
+
  // Post to social networks
  if (SOCIAL_ENABLED && magnitude >= SOCIAL_THRESHOLD) {
  social.publish(ev);
@@ -95,3 +117,4 @@ poller.on('earthquakes', (earthquakes) => {
  logger.info('Done');
  });
 });
+

lib/config/example.config.json

@@ -8,7 +8,9 @@
  },
  "ingv": {
  "pollingInterval": 60000,
- "broadcastThreshold": 5
+ "broadcastAlways": 9,
+ "broadcastThreshold": 5,
+ "broadcastRadius" : 1000
  },
  "social": {
  "enabled": false,