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fix for stale forecast data on regional forecasts #84

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This commit is contained in:
Matt Walsh
2025-05-29 13:32:47 -05:00
parent 205fa77f51
commit 3161a03797
1 changed files with 20 additions and 7 deletions
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27
server/scripts/modules/regionalforecast.mjs
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@@ -7,7 +7,7 @@ import { json } from './utils/fetch.mjs';
import { temperature as temperatureUnit } from './utils/units.mjs';
import { getSmallIcon } from './icons.mjs';
import { preloadImg } from './utils/image.mjs';
import { DateTime } from '../vendor/auto/luxon.mjs';
import { DateTime, Interval } from '../vendor/auto/luxon.mjs';
import WeatherDisplay from './weatherdisplay.mjs';
import { registerDisplay } from './navigation.mjs';
import * as utils from './regionalforecast-utils.mjs';
@@ -77,6 +77,9 @@ class RegionalForecast extends WeatherDisplay {
// get a unit converter
const temperatureConverter = temperatureUnit();
// get now as DateTime for calculations below
const now = DateTime.now();
// get regional forecasts and observations (the two are intertwined due to the design of api.weather.gov)
const regionalDataAll = await Promise.all(regionalCities.map(async (city) => {
try {
@@ -110,14 +113,24 @@ class RegionalForecast extends WeatherDisplay {
preloadImg(getSmallIcon(regionalObservation.icon, !regionalObservation.daytime));
// return a pared-down forecast
// 0th object is the current conditions
// first object is the next period i.e. if it's daytime then it's the "tonight" forecast
// second object is the following period
// always skip the first forecast index because it's what's going on right now
// 0th object should contain the current conditions, but when WFOs go offline or otherwise don't post
// an updated forecast it's possible that the 0th object is in the past.
// so we go on a search for the current time in the start/end times provided in the forecast periods
const { periods } = forecast.properties;
const currentPeriod = periods.reduce((prev, period, index) => {
const start = DateTime.fromISO(period.startTime);
const end = DateTime.fromISO(period.endTime);
const interval = Interval.fromDateTimes(start, end);
if (interval.contains(now)) {
return index;
}
return prev;
}, 0);
// group together the current observation and next two periods
return [
regionalObservation,
utils.buildForecast(forecast.properties.periods[1], city, cityXY),
utils.buildForecast(forecast.properties.periods[2], city, cityXY),
utils.buildForecast(forecast.properties.periods[currentPeriod + 1], city, cityXY),
utils.buildForecast(forecast.properties.periods[currentPeriod + 2], city, cityXY),
];
} catch (error) {
console.log(`No regional forecast data for '${city.name ?? city.city}'`);