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planets.model.js
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planets.model.js
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const fs = require('fs');
const path = require('path');
const parse = require('csv-parse');
const planets = require('./planets.mongo');
function isHabitablePlanet(planet) {
return planet['koi_disposition'] === 'CONFIRMED'
&& planet['koi_insol'] > 0.36 && planet['koi_insol'] < 1.11
&& planet['koi_prad'] < 1.6;
}
function loadPlanetsData() {
return new Promise((resolve, reject) => {
fs.createReadStream(path.join(__dirname, '..', '..', 'data', 'kepler_data.csv'))
.pipe(parse({
comment: '#',
columns: true,
}))
.on('data', async (data) => {
if (isHabitablePlanet(data)) {
savePlanet(data);
}
})
.on('error', (err) => {
console.log(err);
reject(err);
})
.on('end', async () => {
const countPlanetsFound = (await getAllPlanets()).length;
console.log(`${countPlanetsFound} habitable planets found!`);
resolve();
});
});
}
async function getAllPlanets() {
return await planets.find({}, {
'_id': 0, '__v': 0,
});
}
async function savePlanet(planet) {
try {
await planets.updateOne({
keplerName: planet.kepler_name,
}, {
keplerName: planet.kepler_name,
}, {
upsert: true,
});
} catch(err) {
console.error(`Could not save planet ${err}`);
}
}
module.exports = {
loadPlanetsData,
getAllPlanets,
};