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readdata.js

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+import axios from 'axios'
+import * as  fs from 'fs'
+import  { logit, logerror}  from'./logit.js'
+import { DateTime } from 'luxon'
+const API_URL = 'https://api.sensor.community/static/v1/data.json';	// URL to API on 'luftdaten.info'
+const SAVE_NAME = 'data/aktdata.json';  // filename for actual data
+
+let LIVE = (process.env.LIVE == "true") || true
+export let statistics = {};
+
+export const doReadfromAPI = async () => {
+    logit(`LIVE = ${LIVE}`)
+    let start = DateTime.now()
+    let data = []
+    if (LIVE) {
+        logit(`Start Reading from API`)
+        let body
+        for(let count = 1; count <= 3; count++) {
+            try {
+                logit(`Try - ${count}`)
+                let ret = await axios(API_URL, {timeout: 10000})
+                if (ret.status != 200) {
+                    continue
+                }
+                data = ret.data
+                saveDatatoFile(SAVE_NAME, JSON.stringify(data))
+                break
+            } catch (e) {
+                logerror(`doReadfromAPI  ${e}`)
+            }
+        }
+    } else {
+        logit('Start using data on disk')
+        data = readDatafromFile(SAVE_NAME)
+    }
+    statistics.readInTime = start.diffNow('seconds').toObject().seconds * -1
+    statistics.entries = data.length
+    logit(`ReadIn-Time: ${statistics.readInTime} sec`)
+    return data
+}
+
+
+// die Daten in eimnr Datei zwischenspeichern
+function saveDatatoFile(fn, data) {
+    fs.writeFileSync(fn, data)
+}
+
+// Daten wieder vom File lesen
+function readDatafromFile(fn) {
+    return JSON.parse(fs.readFileSync(fn))
+}
+