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Add Eurostar Plus prices and NR advance fare support

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- Eurostar scraper now fetches both Standard and Plus (PLUS class code)
  prices/seats in a single API call; each service dict gains plus_price
  and plus_seats fields
- GWR fares scraper gains fetch_advance() which makes two sets of
  paginated calls (standard advance + first-class advance) and returns
  cheapest per departure; shared _run_pages() generator reduces
  duplication in fetch()
- New /api/advance_fares/<station_crs>/<travel_date> endpoint returns
  advance fares as JSON, cached for 24 hours
- Results page gains NR ticket selector (Walk-on / Std Advance / 1st
  Advance) and Eurostar selector (Standard / Plus); total column is
  JS-computed from the selected combination with cheapest/priciest
  highlighting
- Load advance prices button fetches the API lazily; if advance fares
  are already cached they are embedded in the page and applied on load
  so the button is hidden automatically

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Edward Betts 2026-04-11 16:22:24 +01:00
parent 5583a20143
commit 89a536dfd3
8 changed files with 515 additions and 83 deletions
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45
scraper/eurostar.py
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@ -68,6 +68,9 @@ _GQL_QUERY = (
"}"
)
_STANDARD = 'STANDARD'
_STANDARD_PLUS = 'PLUS'
def search_url(destination: str, travel_date: str) -> str:
dest_id = DESTINATION_STATION_IDS[destination]
@ -87,7 +90,7 @@ def _parse_graphql(data: dict, destination: str) -> list[dict]:
Parse a NewBookingSearch GraphQL response into a list of service dicts.
Each dict contains: depart_st_pancras, arrive_destination, destination,
train_number, price (float or None), seats (int or None).
train_number, price/seats (Standard), plus_price/plus_seats (Standard Premier).
The same St Pancras departure can appear multiple times (different
connecting trains); we keep the entry with the earliest arrival.
@ -98,26 +101,34 @@ def _parse_graphql(data: dict, destination: str) -> list[dict]:
for journey in journeys:
dep = journey['timing']['departureTime']
arr = journey['timing']['arrivalTime']
for fare in journey['fares']:
if fare['classOfService']['code'] == 'STANDARD':
p = fare.get('prices')
price = float(p['displayPrice']) if p and p.get('displayPrice') else None
seats = fare.get('seats')
std_price = std_seats = plus_price = plus_seats = None
train_number = ''
for fare in (journey.get('fares') or []):
cos = fare['classOfService']['code']
p = fare.get('prices')
price = float(p['displayPrice']) if p and p.get('displayPrice') else None
seats = fare.get('seats')
if not train_number:
legs = fare.get('legs') or []
train_number = ' + '.join(
f"{(leg.get('serviceType') or {}).get('code', 'ES')} {leg['serviceName']}"
for leg in legs if leg.get('serviceName')
)
if dep not in best or arr < best[dep]['arrive_destination']:
best[dep] = {
'depart_st_pancras': dep,
'arrive_destination': arr,
'destination': destination,
'train_number': train_number,
'price': price,
'seats': seats,
}
break
if cos == _STANDARD:
std_price, std_seats = price, seats
elif cos == _STANDARD_PLUS:
plus_price, plus_seats = price, seats
if dep not in best or arr < best[dep]['arrive_destination']:
best[dep] = {
'depart_st_pancras': dep,
'arrive_destination': arr,
'destination': destination,
'train_number': train_number,
'price': std_price,
'seats': std_seats,
'plus_price': plus_price,
'plus_seats': plus_seats,
}
return sorted(best.values(), key=lambda s: s['depart_st_pancras'])
@ -148,7 +159,7 @@ def fetch(destination: str, travel_date: str) -> list[dict]:
'outbound': travel_date,
'currency': 'GBP',
'adult': 1,
'filteredClassesOfService': ['STANDARD'],
'filteredClassesOfService': [_STANDARD, _STANDARD_PLUS],
},
'query': _GQL_QUERY,
}