mirror of https://github.com/Askill/thermo-pwa.git
106 lines
2.6 KiB
JavaScript
106 lines
2.6 KiB
JavaScript
const dbconnect = window.indexedDB.open('temps', 1);
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var db = null
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const interval = setInterval(writeTo, 5000);
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dbconnect.onupgradeneeded = ev => {
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console.log('Upgrade DB');
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const db = ev.target.result;
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let store = db.createObjectStore('Temperatures', { keyPath: 'timestamp'});
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store.createIndex("timestamp", "timestamp", { unique: false });
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store.createIndex("temp", "temp", { unique: false });
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store = db.createObjectStore('Humidities', { keyPath: 'timestamp'});
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store.createIndex("timestamp", "timestamp", { unique: false });
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store.createIndex("humidity", "humidity", { unique: false });
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}
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dbconnect.onsuccess = ev => {
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console.log('DB-Upgrade erfolgreich');
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db = ev.target.result;
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}
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function write(type, data){
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const transaction = db.transaction(type, 'readwrite');
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const store = transaction.objectStore(type);
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data.forEach(el => store.add(el));
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transaction.onerror = ev => {
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console.error('Ein Fehler ist aufgetreten!', ev.target.error.message);
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};
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transaction.oncomplete = ev => {
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//console.log('Daten wurden erfolgreich hinzugefügt! ' + type);
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const store = db.transaction(type, 'readonly').objectStore(type);
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//const query = store.get(1); // Einzel-Query
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const query = store.openCursor()
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query.onerror = ev => {
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console.error('Anfrage fehlgeschlagen!', ev.target.error.message);
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};
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query.onsuccess = ev => {
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};
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};
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}
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function writeTo(){
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getJSON("/stats",
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function (error, data) {
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let date = new Date()
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let time = date.getTime()
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let writeData = [
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{timestamp: time, temp: data["temperature"]}
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];
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write("Temperatures", writeData)
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writeData = [
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{timestamp: time, temp: data["humidity"]}
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];
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write("Humidities", writeData)
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},
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function(){
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console.log("Error while getting temps")
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}
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);
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}
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// TODO: replace with fetch
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function getJSON(url, callback, fallback) {
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url, true);
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xhr.responseType = 'json';
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xhr.onload = function () {
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var status = xhr.status;
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if (status < 400) {
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callback(null, xhr.response);
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} else {
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fallback();
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}
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};
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xhr.send();
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};
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function readLast(n){
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let objectStore = db.transaction("Temperatures").objectStore("Temperatures");
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let data = [];
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objectStore.openCursor(null, "prev").onsuccess = function(event) {
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var cursor = event.target.result;
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if (cursor && data.length < n) {
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//console.log(cursor.value);
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data.push(cursor.value)
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cursor.continue();
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}
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};
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return data
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} |