Add Accra adapter

src/adapters/accra.js

@@ -0,0 +1,108 @@
+'use strict';
+import log from '../lib/logger.js';
+import client from '../lib/requests.js';
+import got from 'got';
+import { DateTime } from 'luxon';
+
+export const parameters = {
+  pm1: { name: 'pm1', unit: 'µg/m³' },
+  pm25: { name: 'pm25', unit: 'µg/m³' },
+  pm10: { name: 'pm10', unit: 'µg/m³' },
+  no2: { name: 'no2', unit: 'µg/m³' },
+  humidity: { name: 'releativehumidity', unit: '%' },
+};
+
+const stationsUrl = 'https://breatheaccra.org/_next/data/sDbKIZJuzXb7sPDYTkBBo/index.json';
+const ghanaStationsUrl = 'https://breatheaccra.org/_next/data/sDbKIZJuzXb7sPDYTkBBo/ghair.json';
+const measurementsUrl = 'https://breatheaccra.org/api/LatestReadings';
+
+export const name = 'accra';
+
+export async function fetchData(source, cb) {
+  try {
+    const stations = await fetchStations();
+    const measurements = await Promise.all(
+      Object.values(stations).map(station => fetchMeasurements(station))
+    );
+    const formattedMeasurements = measurements.flatMap(m => m);
+    return cb(null, { measurements: formattedMeasurements });
+  } catch (error) {
+    log.error('Failed to fetch data', error);
+    cb(error);
+  }
+}
+
+async function fetchStations() {
+  try {
+    const [accraResponse, ghanaResponse] = await Promise.all([
+      client({ url: stationsUrl }),
+      client({ url: ghanaStationsUrl })
+    ]);
+
+    const stations = {
+      ...accraResponse.pageProps.sensors.reduce((obj, sensor) => {
+        obj[sensor.deviceID] = sensor;
+        return obj;
+      }, {}),
+      ...ghanaResponse.pageProps.sensors.reduce((obj, sensor) => {
+        obj[sensor.deviceID] = sensor;
+        return obj;
+      }, {})
+    };
+
+    log.debug('Stations fetched:', Object.keys(stations).length);
+    return stations;
+  } catch (error) {
+    throw new Error(`Fetch stations error: ${error.message}`);
+  }
+}
+
+async function fetchMeasurements(station) {
+  try {
+    const response = await got.post(measurementsUrl, {
+      json: { sensors: [{ type: station.type, deviceID: station.deviceID }] },
+      responseType: 'json'
+    });
+
+    if (response.body.readings && response.body.readings.length > 0) {
+      return formatData(response.body.readings[0], station);
+    } else {
+      log.debug(`No measurements found for station ${station.deviceID}`);
+      return [];
+    }
+  } catch (error) {
+    log.debug(`Fetch measurements error for station ${station.deviceID}: ${error.message}`);
+    return [];
+  }
+}
+
+function formatData(measurement, station) {
+  const date = DateTime.fromFormat(measurement.time, 'M/d/yyyy, h:mm:ss a', { zone: 'Africa/Accra' });
+
+  const formattedMeasurements = Object.entries(measurement.measurements).map(([key, value]) => {
+    if (parameters[key]) {
+      return {
+        date: {
+          utc: date.toUTC().toISO({ suppressMilliseconds: true }),
+          local: date.toISO({ suppressMilliseconds: true }),
+        },
+        averagingPeriod: { unit: 'hours', value: 1 },
+        city: station.district.name,
+        attribution: [
+          { name: 'Breathe Accra', url: 'https://breatheaccra.org/' }
+        ],
+        unit: parameters[key].unit,
+        value: value,
+        parameter: parameters[key].name,
+        location: station.vicinity,
+        coordinates: {
+          longitude: station.longitude,
+          latitude: station.latitude
+        }
+      };
+    }
+    return null;
+  }).filter(m => m !== null);
+
+  return formattedMeasurements;
+}

src/sources/gh.json

@@ -1,16 +1,15 @@
 [
     {
-        "url": "unused",
-        "adapter": "unused",
-        "name": "Dr. Raphael E. Arku and Colleagues",
-        "city": "Accra",
-        "country": "GH",
-        "description": "Manual ingest of data from Dr. Raphael E. Arku and colleagues",
-        "sourceURL": "https://www.ncbi.nlm.nih.gov/pubmed?term=Arku+RE%5BAuthor%5D+AND+Accra+air+pollution%5BAll+Fields%5D&cmd=DetailsSearch",
-        "contacts": [
-            "[email protected]"
-        ],
-        "active": false
+      "url": "https://breatheaccra.org/",
+      "adapter": "accra",
+      "name": "breathe-accra",
+      "country": "GH",
+      "description": "Breathe Accra is a project that provides real-time air quality data for Accra, Ghana",
+      "sourceURL": "https://breatheaccra.org/",
+      "contacts": [
+        "[email protected]"
+      ],
+      "active": true
     },
     {
         "url": "http://dosairnowdata.org/dos/RSS/Accra/Accra-PM2.5.xml",