nextbus-to-gtfs-rt/lib/vehiclePositions.js

A script that converts the nextbus api to gtfs-rt

var moment = require('moment'),
  realtime = require('gtfs-realtime-bindings')

var util = require('./util.js')

module.exports = function(nextbus, callback) {

  var msg = util.makeMessageTemplate()

  nextbus.vehicleLocations(function(err, data) {

    if(err) {
      return callback(err)
    }

    var vehicles = util.ensureArray(data.vehicle);

    for (var i = 0; i < vehicles.length; i++) {
      curVehicle = vehicles[i].$;

      msg.entity.push(new realtime.FeedEntity({
        id: 'Vehicle Position ' + i,
        vehicle: new realtime.VehiclePosition({
          position: new realtime.Position({
            latitude: curVehicle.lat,
            longitude: curVehicle.lon,
            bearing: curVehicle.heading,
            speed: curVehicle.speedKmHr ? parseFloat(curVehicle.speedKmHr) * 0.277778 : 0
          }),
          timestamp: moment().unix() - parseInt(curVehicle.secsSinceReport, 10),
          vehicle: new realtime.VehicleDescriptor({
            id: curVehicle.id
          })
        })
      }))
    }

    callback(null, msg)
  
  })
}