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Fix #84, with one caveat

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This commit is contained in:
7400
2024-03-02 10:50:50 -08:00
parent 6cecac77db
commit 4a076ddde7
2 changed files with 26 additions and 13 deletions
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28
src/charts/jBars.js
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@@ -44,7 +44,7 @@ export async function jBars (from, to, res) {
const is_single_res = single_res.includes(res);
const is_monthly_res = !is_single_res && !is_daily_res;
var bars = [];
let bars = [];
for ( // Once around for each sample in from-to range
let iDate = fromDate,
@@ -78,9 +78,9 @@ export async function jBars (from, to, res) {
let response = await fetch(url);
if (response.ok) {
ohlc = await response.json();
console.log(`Fetch: ${ohlc.length} samples from ${url}`)
console.log(`from: ${new Date(ohlc[0][0]*1000)}`)
console.log(`to: ${new Date(ohlc[ohlc.length-1][0]*1000)}`)
console.log(`Fetch: ${ohlc.length} resolution ${res} samples from ${url}`)
console.log(`first: ${new Date(ohlc[0][0]*1000).toUTCString()}`)
console.log(`last: ${new Date(ohlc[ohlc.length-1][0]*1000).toUTCString()}`)
} else {
console.log(`Fetch: file not found: ${url}`)
ohlc = []; // no file, then empty data
@@ -101,8 +101,9 @@ export async function jBars (from, to, res) {
// let ohlcDate = iohlc >= ohlc.length ? undefined : new Date(ohlc[iohlc][0]+'Z');
let ohlcDate = iohlc >= ohlc.length ? undefined : new Date(ohlc[iohlc][0]*1000);
// no ohlc sample file, insert missing sample
// no ohlc sample file, or sample file exists and asking for sample beyond last sample, insert missing sample
const insert_missing_samples = false;
const visible_missing_samples = false;
if (ohlcDate == undefined) {
bar = {
@@ -114,7 +115,8 @@ export async function jBars (from, to, res) {
high: 50,
low: 0,
close: 0,
});
});
if (!insert_missing_samples) bar = undefined;
}
// file exists, but ohlc sample not for this time, insert missing sample
@@ -128,6 +130,7 @@ export async function jBars (from, to, res) {
low: 0,
close: 0,
});
if (!insert_missing_samples) bar = undefined;
}
// Copy ohlc sample
@@ -156,5 +159,16 @@ export async function jBars (from, to, res) {
}
}
return bars;
// noData should be set only if no samples in interval and earlier.
// In our case, we are guaranteed to have contiguous samples.
// So we only return zero bars if:
// 1. interval is before first data available.
// 2. interval is after last data available.
// Returning no samples based on length works assuming that TV never asks for case 2.
// This is probably not a safe assumption. The alternative would be to search
// backward to find beginning of history. How far to search?
let noData = bars.length == 0;
if (noData) console.log("noData == true!");
return [bars, {noData}];
}