feat: working data download and indexing

src/lib/data-source.mjs

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+import logger from './logger.mjs';
+import { BadRequest } from './es-errors.mjs';
+import zeroPad from './zero-pad.mjs';
+
+const doctype = 'doc';
+
+// helper for time-based indices
+function getIndexName(index) {
+  const d = new Date();
+  const [year, month, day] = [
+    d.getFullYear(),
+    zeroPad(d.getMonth() + 1, 2),
+    zeroPad(d.getDate(), 2),
+  ];
+  return `${index}-${year}.${month}.${day}`;
+}
+
+export async function createIndex(client, index) {
+  const realIndex = getIndexName(index);
+  return client.indices
+    .create({
+      index: realIndex,
+      body: {
+        settings: {},
+        mappings: {
+          [doctype]: {
+            properties: {
+              transponder: { type: 'keyword' },
+              callsign: { type: 'keyword' },
+              origin_country: { type: 'keyword' },
+              time_position: { type: 'date' },
+              last_contact: { type: 'date' },
+              location: { type: 'geo_point' },
+              baro_altitude: { type: 'float' },
+              geo_altitude: { type: 'float' },
+              on_ground: { type: 'boolean' },
+              velocity: { type: 'float' },
+              vertical_rate: { type: 'float' },
+              squawk: { type: 'keyword' },
+              spi: { type: 'boolean' },
+              position_source: { type: 'keyword' },
+            },
+          },
+        },
+      },
+    })
+    .then(res => {
+      logger.debug(`Index created: ${res.index}`);
+      return res.index;
+    })
+    .catch(err => {
+      // check for existing index
+      if (err instanceof BadRequest) {
+        logger.debug(`Index exists: ${realIndex}`);
+        return client.indices.get({ index: realIndex }).then(() => realIndex);
+      }
+
+      throw err;
+    });
+}
+
+export async function createDocument(client, index, body) {
+  client.index({
+    index,
+    type: doctype,
+    body,
+  });
+}
+
+export async function bulkInsert(client, index, docs) {
+  const body = docs.reduce((collection, doc) => {
+    collection.push({ index: { _index: index, _type: doctype } });
+    collection.push(doc);
+    return collection;
+  }, []);
+
+  client.bulk({
+    body,
+  });
+}

src/lib/es-errors.mjs

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+import elasticsearch from 'elasticsearch';
+
+export const { BadRequest, NotFound, Forbidden, Conflict } = elasticsearch.errors;

src/lib/fetch.mjs

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+import axios from 'axios';
+
+const api = 'https://opensky-network.org/api';
+
+export default axios.create({
+  baseURL: api,
+  timeout: 3000,
+  responseType: 'json',
+  headers: {
+    'X-Custom-Header': 'foobar',
+    'Content-Type': 'application/json; charset=utf-8',
+  },
+});

src/lib/get-data.mjs

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+import fetch from './fetch.mjs';
+
+export default async function getData() {
+  const res = await fetch.get('/states/all');
+  return res.data.states;
+}

src/lib/logger.mjs

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+/* eslint no-console: 0 */
+import zeroPad from './zero-pad.mjs';
+
+const getTimestamp = () => {
+  const d = new Date();
+  return `${[d.getFullYear(), zeroPad(d.getMonth() + 1, 2), zeroPad(d.getDate(), 2)].join('/')} ${[
+    zeroPad(d.getHours(), 2),
+    zeroPad(d.getMinutes(), 2),
+    zeroPad(d.getSeconds(), 2),
+  ].join(':')}`;
+};
+
+const wrapMessage = msg => `[${getTimestamp()}]: ${msg.map(m => JSON.stringify(m)).join(' ')}`;
+
+const logger = {
+  log(...args) {
+    console.log(wrapMessage(args));
+  },
+  warn(...args) {
+    console.warn(wrapMessage(args));
+  },
+  error(...args) {
+    if (args[0] instanceof Error) {
+      console.error(getTimestamp(), args[0].stack);
+      return;
+    }
+    console.error(wrapMessage(args));
+  },
+  debug(...args) {
+    if (!process.env.DEBUG) return;
+    console.log(wrapMessage(args));
+  },
+};
+
+export default logger;

src/lib/zero-pad.mjs

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+export default function zeroPad(str, len) {
+  let output = `${str}`;
+  if (!len || len <= output.length) return str;
+
+  while (output.length < len) {
+    output = `0${output}`;
+  }
+  return output;
+}