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bar-chart-data.js
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bar-chart-data.js
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module.exports = function (RED) {
function barChartDataNode(config) {
RED.nodes.createNode(this, config);
this.on('input', function (msg) {
this.unit = config.unit;
this.x_interval = config.x_interval || 'hours';
this.x_size = config.x_size || 24;
this.precision = config.precision || 2;
this.is_meter_reading = (config.is_meter_reading == 'True') || false;
this.agg_by = config.agg_by || 'sum';
this.prevent_negative = config.prevent_negative;
var store = this.context();
if (msg.payload === 'clear')
clearNode(msg, this, store);
else if (msg.payload.toString().split(' ')[0] === 'set_meter_value')
setMeterValue(msg, this, store);
else if (msg.hasOwnProperty("bar_keys")) //restore
restoreNode(msg, this, store);
else
barChartData(msg, this, store);
this.send(msg);
});
}
RED.nodes.registerType("bar-chart-data", barChartDataNode);
}
function setMeterValue(msg, myNode, store) {
if (msg.topic == '') {
myNode.error('topic is missing, cannot set the new meter value');
return;
}
let newValue = Number(msg.payload.split(' ')[1]);
if (isNaN(newValue)) {
myNode.error('new meter value is missing, use for example "set_meter_value 123.45"');
return;
}
store.set(msg.topic + '_last', newValue);
msg.payload = {};
msg.info = 'new meter value is ' + newValue + ' for ' + msg.topic;
}
function clearNode(msg, myNode, store) {
let topics = store.get('topics') || [];
let topicsOld = store.get('topics') || [];
//maybe only 1 specific topic should be cleared
if (msg.topic != "") {
topics = [msg.topic];
}
//for all topics
for (let i = 0; i < topics.length; i++) {
store.set(topics[i] + '_data', {});
store.set(topics[i] + '_last', {});
}
//clear data_counter array
let dataCounterNew = [];
if (msg.topic != "" && topicsOld.length > 1) {
dataCounterNew = store.get('data_counter') || [];
dataCounterNew.splice(topicsOld.indexOf(msg.topic), 1);
}
store.set('data_counter', dataCounterNew);
//clear topic array (or only specific topic)
let topicsNew = [];
if (msg.topic != "" && topicsOld.length > 1) {
topicsNew = topicsOld;
topicsNew.splice(topicsOld.indexOf(msg.topic), 1);
}
store.set('topics', topicsNew);
msg.payload = {};
msg.info = 'data cleared ' + msg.topic;
};
function restoreNode(msg, myNode, store) {
let data = msg.payload[0].data;
let keys = msg.bar_keys;
let topics = msg.topics;
//restore with older bar-chart-data version
if (topics === undefined) { topics = [msg.topic]; }
//restore data for all topics
for (let i = 0; i < topics.length; i++) {
let restoredData = {};
let topicData = data[i];
if (topicData === undefined) { topicData = []; };
for (var i2 = 0; i2 < topicData.length; i2++) {
restoredData[keys[i2]] = topicData[i2];
}
let topic = topics[i];
store.set(topic + '_data', restoredData);
store.set(topic + '_data_counter', msg.data_counter[i]);
if (msg.hasOwnProperty(topic + '_last')) {
store.set(topic + '_last', Number(msg[topic + '_last']));
} else if (msg.hasOwnProperty('last')) {
store.set(topic + '_last', Number(msg.last));
}
}
//restore topics array
store.set('topics', topics);
msg.info = 'data restored';
};
function barChartData(msg, myNode, store) {
let m = {};
let data = store.get(msg.topic + '_data') || {};
let dataCounter = store.get(msg.topic + '_data_counter') || {};
let reading = Number(msg.payload);
let ts = msg.ts || msg.timestamp || (+ new Date());
if (ts <= 9999999999) { ts *= 1000 } //sec ts to millis ts, only works until 2286-11-20 :(
let curDate = new Date(ts);
saveTopic(msg.topic, store); //save topic to store (for cleaning and handling of multiple topics)
let topics = store.get('topics');
//if is_meter_reading == true, use diff between last and current payload value
if (myNode.is_meter_reading) {
let last = store.get(msg.topic + '_last') || reading;
store.set(msg.topic + '_last', reading);
msg[msg.topic + '_last'] = reading;
reading = reading - last;
//prevent getting negative - eg. after a meter change
if (myNode.prevent_negative && reading < 0) {
reading = 0;
myNode.warn('new meter value is lower than last one, prevented reading getting negative');
}
}
//remove outdated elements from data
let newkeys = buildKeys(curDate);
for (let oldkey in data) {
if (!newkeys.includes(oldkey)) {
delete data[oldkey];
}
}
//current key
let curKey = newkeys[newkeys.length - 1];
//calc new Value for the current period
let oldVal = null;
if (data.hasOwnProperty(curKey)) {
oldVal = data[curKey];
}
let newVal = oldVal;
if (myNode.agg_by == "sum") {
newVal = Math.round(((oldVal || 0) + Number(reading)) * 100000000) / 100000000;
}
else if (myNode.agg_by == "min") {
if (oldVal === null) { oldVal = reading; } //Math.min() doesnt work with null values (other than max())
newVal = Math.min(oldVal, reading);
}
else if (myNode.agg_by == "max") {
newVal = Math.max(oldVal, reading);
}
else if (myNode.agg_by == "avg") {
//in this case, we store the number of readings in "data_counter" json and use it to calc the avg
//get weight of old value
let oldDataCounter = 0;
if (dataCounter.hasOwnProperty(curKey)) {
oldDataCounter = dataCounter[curKey];
}
//calc avg
newVal = ((oldVal * oldDataCounter) + reading) / (oldDataCounter + 1);
//save to context
dataCounter = {}; //we only need to remember the number of readings in the current period
dataCounter[curKey] = oldDataCounter + 1;
store.set(msg.topic + '_data_counter', dataCounter);
}
data[curKey] = newVal;
//store new data in the context store
store.set(msg.topic + '_data', data);
//build msg
m.labels = buildLabels(curDate);
m.series = topics;
m.data = [];
//build factor for the rounding
let precision = 1;
if (myNode.precision > 0) {
precision = Math.pow(10, Math.round(myNode.precision));
}
//build data array for each topic
let dataAll = []
for (let i = 0; i < topics.length; i++) {
m.data.push([]); //add new array
topic = topics[i];
data = store.get(topic + '_data') || [];
newkeys.forEach(function (key) {
if (data.hasOwnProperty(key)) {
m.data[i].push(Math.round(data[key] * precision) / precision);
} else {
m.data[i].push(0);
}
});
dataAll = dataAll.concat(m.data[i]);
}
msg.payload = [m];
//send list of complete keys, used also as flag to be able to identify bar
//data at the input of this node, to restore the context store (after reboot)
//this makes the use of persist nodes possible
msg.bar_keys = newkeys;
msg.data_counter = getDataCounters(store);
msg.topics = topics;
//put all "_last" values into msg (for restoring)
addLastValues(store, msg);
//add min,max,sum
msg.data_min = Math.min(...dataAll);
msg.data_max = Math.max(...dataAll);
const arrSum = arr => arr.reduce((a, b) => a + b, 0);
msg.data_sum = Math.round(arrSum(dataAll) * precision) / precision;
//put all settings into msg (could be used for dynamic chart titles etc.)
msg.settings = {
unit: myNode.unit,
x_interval: myNode.interval,
x_size: myNode.x_size,
precision: myNode.precision,
is_meter_reading: myNode.is_meter_reading,
agg_by: myNode.agg_by,
prevent_negative: myNode.prevent_negative
};
return msg;
function buildDateKey(date) {
let fullKey = ("" + date.getFullYear()) +
("0" + (date.getMonth() + 1)).slice(-2) +
("0" + date.getDate()).slice(-2) +
("0" + date.getHours()).slice(-2) +
("0" + date.getMinutes()).slice(-2) +
("0" + date.getSeconds()).slice(-2);
if (myNode.x_interval == "seconds") {
return fullKey;
}
else if (myNode.x_interval == "minutes") {
return fullKey.slice(0, -2);
}
else if (myNode.x_interval == "quarter_hours") {
return fullKey.slice(0, -4) + "_" + getQuarterHour(date);
}
else if (myNode.x_interval == "hours") {
return fullKey.slice(0, -4);
}
else if (myNode.x_interval == "days") {
return fullKey.slice(0, -6);
}
else if (myNode.x_interval == "months") {
return fullKey.slice(0, -8);
}
else if (myNode.x_interval == "years") {
return fullKey.slice(0, -10);
}
};
function getQuarterHour(date) {
return Math.floor((date.getMinutes()) / 15) + 1;
};
function dateMinus(date_in, minus = 1) {
let date = new Date(date_in);
if (myNode.x_interval == "seconds") {
date.setSeconds(date.getSeconds() - minus);
}
else if (myNode.x_interval == "minutes") {
date.setMinutes(date.getMinutes() - minus);
}
else if (myNode.x_interval == "quarter_hours") {
date.setMinutes(date.getMinutes() - (minus * 15));
}
else if (myNode.x_interval == "hours") {
date.setHours(date.getHours() - minus);
}
else if (myNode.x_interval == "days") {
date.setDate(date.getDate() - minus);
}
else if (myNode.x_interval == "months") {
date.setDate(1); //to avoid issues with end of month
date.setMonth(date.getMonth() - minus);
}
else if (myNode.x_interval == "years") {
date.setFullYear(date.getFullYear() - minus);
}
return date;
};
function buildLabels(date) {
let labels = [];
for (let i = 0; i < myNode.x_size; i++) {
let label;
if (myNode.x_interval == "seconds") {
label = ("0" + date.getHours()).slice(-2) + ":" + ("0" + date.getMinutes()).slice(-2) + ":" + ("0" + date.getSeconds()).slice(-2);
}
else if (myNode.x_interval == "minutes") {
label = ("0" + date.getHours()).slice(-2) + ":" + ("0" + date.getMinutes()).slice(-2);
}
else if (myNode.x_interval == "quarter_hours") {
label_date = new Date(date);
label_date.setMinutes(getQuarterHour(date) * 15);
label = ("0" + label_date.getHours()).slice(-2) + ":" + ("0" + label_date.getMinutes()).slice(-2);
}
else if (myNode.x_interval == "hours") {
label = ("0" + date.getHours()).slice(-2);
}
else if (myNode.x_interval == "days") {
label = ("0" + (date.getMonth() + 1)).slice(-2) + "-" + ("0" + date.getDate()).slice(-2);
}
else if (myNode.x_interval == "months") {
label = "" + date.getFullYear() + "-" + ("0" + (date.getMonth() + 1)).slice(-2);
}
else if (myNode.x_interval == "years") {
label = "" + date.getFullYear();
}
labels.push(label);
date = dateMinus(date);
}
return labels.reverse();
};
function buildKeys(date) {
let keys = [];
for (let i = 0; i < myNode.x_size; i++) {
keys.push(buildDateKey(date));
date = dateMinus(date);
}
return keys.reverse();
};
function saveTopic(topic, store) {
let topics = store.get('topics') || [];
if (topics.indexOf(topic) == -1) {
topics.push(topic);
store.set('topics', topics);
}
};
function getDataCounters(store) {
let topics = store.get('topics') || [];
let dataCounter = [];
for (let i = 0; i < topics.length; i++) {
dataCounter.push(store.get(topics[i] + '_data_counter') || 0);
}
return dataCounter;
};
function addLastValues(store, msg) {
for (let i = 0; i < topics.length; i++) {
msg[topics[i] + '_last'] = store.get(topics[i] + '_last');
}
};
};