cache-relays.ts

/**
 * This script downloads the latest list of relay nodes from the awesome-algorand repository,
 * translates them to GeoJSON and caches it to the src/layers/relays.geo.json file
 */

import fs from 'fs'
import { dirname, resolve } from 'path';
import { fileURLToPath } from 'url';
import * as turf from '@turf/turf'

const __dirname = dirname(fileURLToPath(import.meta.url));

const RELAY_URL = 'https://raw.githubusercontent.com/awesome-algorand/awesome-algorand/stats/.github/scripts/relay_nodes.json'
const RELAY_CACHE = resolve(__dirname, '../src/layers/relays.geo.json')

type RelayRecord = {
  "lat": number,
  "lon": number,
  "countryCode": string,
  "country": string,
  "city": string,
  "domain": string,
  "ip": string
}

let data
if( fs.existsSync(RELAY_CACHE) && process.env.FORCE_DOWNLOAD !== 'true' ) {
  data = JSON.parse(fs.readFileSync(RELAY_CACHE, 'utf8'))
} else {
  data = await fetch(RELAY_URL).then(res => res.json())
  data = turf.featureCollection(data.map((relay: RelayRecord)=>{
      return turf.point([relay.lon, relay.lat], {
        countryCode: relay.countryCode,
        name: relay.city,
        country: relay.country,
        domain: relay.domain,
        ip: relay.ip
      })
  }))
  fs.writeFileSync(RELAY_CACHE, JSON.stringify(data, null, 2))
}