Code to run from cron to update bank holiday list

agenda/uk_holiday.py

@@ -10,12 +10,24 @@ from dateutil.easter import easter
 
 from .types import Holiday, StrDict
 
+url = "https://www.gov.uk/bank-holidays.json"
+
+
+async def get_holiday_list(data_dir: str) -> list[StrDict]:
+    """Download holiday list and save cache."""
+    filename = os.path.join(data_dir, "bank-holidays.json")
+
+    async with httpx.AsyncClient() as client:
+        r = await client.get(url)
+    events: list[StrDict] = r.json()["england-and-wales"]["events"]  # check valid
+    open(filename, "w").write(r.text)
+    return events
+
 
 async def bank_holiday_list(
     start_date: date, end_date: date, data_dir: str
 ) -> list[Holiday]:
     """Date and name of the next UK bank holiday."""
-    url = "https://www.gov.uk/bank-holidays.json"
     filename = os.path.join(data_dir, "bank-holidays.json")
     use_cached = False
     events: list[StrDict]
@@ -29,10 +41,7 @@ async def bank_holiday_list(
                 use_cached = False
 
     if not use_cached:
-        async with httpx.AsyncClient() as client:
+        events = await get_holiday_list(data_dir)
-            r = await client.get(url)
-        open(filename, "w").write(r.text)
-        events = json.load(open(filename))["england-and-wales"]["events"]
 
     hols: list[Holiday] = []
     for event in events:

update_bank_holiday_list.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python3
+"""Update cached copy of UK Bank holidays."""
+
+import asyncio
+import sys
+from time import time
+
+import agenda.types
+import agenda.uk_holiday
+from agenda.types import StrDict
+
+config = __import__("config.default", fromlist=[""])
+
+
+async def get_bank_holidays() -> list[StrDict]:
+    """Call space launch API and cache results."""
+    return await agenda.uk_holiday.get_holiday_list(config.DATA_DIR)
+
+
+t0 = time()
+events: list[StrDict] = asyncio.run(get_bank_holidays())
+time_taken = time() - t0
+if not sys.stdin.isatty():
+    sys.exit(0)
+print(len(events), "bank holidays in list")
+print(f"took {time_taken:.1f} seconds")