edward/paddington-eurostar
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Cache walk-on NR fares by day of week for instant display

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Store GWR walk-on fares keyed by timetable period + weekday
(weekday_gwr_fares_{direction}_{crs}_{period}_{day}), mirroring
the existing NR timetable weekday cache strategy.

On page load the server embeds any cached weekday fares in the page
as WALKON_CACHED_FARES so JS can populate prices immediately without
waiting for the GWR API. The live API call still runs afterwards to
verify and update any changed fares; the spinner label changes to
"Verifying fares" when cached prices are already shown.

The weekday cache is written whenever exact-date fares are fetched
from GWR, keeping it fresh, and populated lazily from the exact-date
cache on first access.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Edward Betts 2026-05-25 16:51:11 +01:00
parent 1bc7631863
commit 5f0d2c71b1
2 changed files with 28 additions and 0 deletions
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10
templates/results.html
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@ -142,6 +142,7 @@
const DEFAULT_MIN_CONN_IN = {{ default_inbound_min_connection }};
let TRIP_FARES = {{ trip_fares_json | safe }};
let ADVANCE_FARES = {{ advance_fares_json | safe }};
const WALKON_CACHED_FARES = {{ walkon_cached_fares_json | safe }};
let WALKON_API_URLS = {{ walkon_api_urls_json | safe }};
let ADVANCE_API_URLS = {{ advance_api_urls_json | safe }};
let ADVANCE_STREAM_URLS = {{ advance_stream_urls_json | safe }};
@ -566,8 +567,17 @@
return c === 'advance_std' || c === 'advance_1st';
});
if (needsAdvance) loadMissingAdvanceFares();
/* Pre-populate walk-on fares from weekday cache so prices show immediately */
var hasPreloaded = false;
for (var sid in WALKON_CACHED_FARES) {
if (WALKON_CACHED_FARES[sid]) { mergeWalkonFares(sid, WALKON_CACHED_FARES[sid]); hasPreloaded = true; }
}
updateDisplay();
updateRowHighlights();
if (hasPreloaded) {
var loadingEl = document.getElementById('walkon-loading');
if (loadingEl) loadingEl.innerHTML = '<span class="spinner spinner-inline" aria-hidden="true"></span>Verifying fares';
}
loadWalkonFares();
startTimetableRefresh();
}