mirror of https://github.com/ghostfolio/ghostfolio
mister-ideas
1 day ago
7 changed files with 368 additions and 284 deletions
@ -1,50 +0,0 @@ |
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import { |
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getIntradayChartItems, |
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INTRADAY_SAMPLE_INTERVAL_MS, |
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loadIntradaySamples, |
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recordIntradaySample |
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} from './intraday-samples'; |
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|
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describe('intraday samples', () => { |
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const now = new Date(2026, 9, 21, 10, 0, 0); |
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beforeEach(() => { |
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localStorage.clear(); |
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}); |
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it('records at most one sample per minute', () => { |
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recordIntradaySample({ now, value: 1 }); |
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recordIntradaySample({ now: new Date(now.getTime() + 5_000), value: 2 }); |
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expect(loadIntradaySamples(now)).toEqual([ |
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{ timestamp: now.getTime(), value: 2 } |
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]); |
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recordIntradaySample({ |
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now: new Date(now.getTime() + INTRADAY_SAMPLE_INTERVAL_MS), |
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value: 3 |
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}); |
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expect(loadIntradaySamples(now)).toHaveLength(2); |
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}); |
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it('removes the samples of previous days', () => { |
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recordIntradaySample({ now: new Date(2026, 9, 20, 15, 0), value: 1 }); |
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recordIntradaySample({ now, value: 2 }); |
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expect(loadIntradaySamples(new Date(2026, 9, 20))).toEqual([]); |
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expect(loadIntradaySamples(now)).toHaveLength(1); |
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}); |
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it('starts the chart of the day with the baseline at midnight', () => { |
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const items = getIntradayChartItems({ |
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now, |
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baseline: 0, |
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samples: [{ timestamp: now.getTime(), value: 0.5 }] |
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}); |
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expect(items).toHaveLength(2); |
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expect(new Date(items[0].date).getHours()).toBe(0); |
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expect(items[1].value).toBe(0.5); |
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}); |
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}); |
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@ -1,83 +0,0 @@ |
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import { LineChartItem } from '@ghostfolio/common/interfaces'; |
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import { format, startOfDay } from 'date-fns'; |
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export const INTRADAY_SAMPLES_KEY_PREFIX = 'gf-intraday-'; |
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export const INTRADAY_SAMPLE_INTERVAL_MS = 60_000; |
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export interface IntradaySample { |
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timestamp: number; |
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value: number; |
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} |
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function getKey(aDate: Date) { |
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return `${INTRADAY_SAMPLES_KEY_PREFIX}${format(aDate, 'yyyy-MM-dd')}`; |
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} |
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export function loadIntradaySamples(aDate = new Date()): IntradaySample[] { |
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try { |
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const samples = JSON.parse(localStorage.getItem(getKey(aDate)) ?? '[]'); |
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return Array.isArray(samples) ? samples : []; |
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} catch { |
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return []; |
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} |
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} |
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/** |
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* Stores the current value of the day (at most one sample per minute) in the |
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* local storage of the device, because only a single value per day is stored |
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* on the server. Samples of previous days are removed. |
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*/ |
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export function recordIntradaySample({ |
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now = new Date(), |
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value |
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}: { |
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now?: Date; |
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value: number; |
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}): IntradaySample[] { |
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const samples = loadIntradaySamples(now); |
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const last = samples.at(-1); |
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if (!last || now.getTime() - last.timestamp >= INTRADAY_SAMPLE_INTERVAL_MS) { |
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samples.push({ value, timestamp: now.getTime() }); |
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} else { |
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// Keep the latest value of the current minute
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last.value = value; |
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} |
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try { |
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for (let index = localStorage.length - 1; index >= 0; index--) { |
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const key = localStorage.key(index); |
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if (key?.startsWith(INTRADAY_SAMPLES_KEY_PREFIX) && key !== getKey(now)) { |
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localStorage.removeItem(key); |
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} |
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} |
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localStorage.setItem(getKey(now), JSON.stringify(samples)); |
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} catch {} |
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return samples; |
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} |
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/** |
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* Builds the chart of the current day: the baseline (the close of the previous |
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* day) at the start of the day followed by the recorded samples of the day. |
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*/ |
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export function getIntradayChartItems({ |
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baseline, |
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now = new Date(), |
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samples |
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}: { |
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baseline: number; |
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now?: Date; |
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samples: IntradaySample[]; |
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}): LineChartItem[] { |
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return [ |
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{ date: startOfDay(now).toISOString(), value: baseline }, |
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...samples.map(({ timestamp, value }) => { |
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return { value, date: new Date(timestamp).toISOString() }; |
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}) |
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]; |
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} |
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