From c41bcc33041adc488fc020cf48e54f59adad85dd Mon Sep 17 00:00:00 2001
From: Edward Betts <edward@4angle.com>
Date: Mon, 1 Jul 2024 22:22:23 +0300
Subject: [PATCH] Catch errors retrieving FX rates and return cached version

---
 agenda/fx.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/agenda/fx.py b/agenda/fx.py
index 90cbc5f..efd4d7d 100644
--- a/agenda/fx.py
+++ b/agenda/fx.py
@@ -90,10 +90,14 @@ def get_rates(config: flask.config.Config) -> dict[str, Decimal]:
     except httpx.ConnectError:
         return read_cached_rates(full_path, currencies)
 
+    try:
+        data = json.loads(response.text, parse_float=Decimal)
+    except json.decoder.JSONDecodeError:
+        return read_cached_rates(full_path, currencies)
+
     with open(os.path.join(fx_dir, filename), "w") as file:
         file.write(response.text)
 
-    data = json.loads(response.text, parse_float=Decimal)
     return {
         cur: Decimal(data["quotes"][f"GBP{cur}"])
         for cur in currencies