Fix wrong Decimal type

Signed-off-by: alfred richardsn <rchrdsn@protonmail.ch>

src/escrow/escrow_offer.py

@@ -63,6 +63,8 @@ class EscrowOffer:
     sum_fee_up: typing.Optional[Decimal128] = None
     #: Amount of held currency with agreed fee substracted.
     sum_fee_down: typing.Optional[Decimal128] = None
+    #: Amount of insured currency.
+    insured: typing.Optional[Decimal128] = None
     #: Unix time stamp of counteragent first reaction to sent offer.
     react_time: typing.Optional[float] = None
     #: Unix time stamp since which transaction should be checked.

src/handlers/escrow.py

@@ -128,7 +128,7 @@ async def wrapper(message: types.Message, state: FSMContext):
 
 async def get_insurance(offer: EscrowOffer) -> Decimal:
     """Get insurance of escrow asset in ``offer`` taking limits into account."""
-    offer_sum = offer[f"sum_{offer.type}"]
+    offer_sum = offer[f"sum_{offer.type}"].to_decimal()
     asset = offer[offer.type]
     limits = await get_escrow_instance(asset).get_limits(asset)
     if not limits:
@@ -138,7 +138,9 @@ async def get_insurance(offer: EscrowOffer) -> Decimal:
         [{"$group": {"_id": 0, "insured_total": {"$sum": "$insured"}}}]
     )
     if await cursor.fetch_next:
-        insured_total = cursor.next_object()["insured_total"].to_decimal()
+        insured_total = cursor.next_object()["insured_total"]
+        if insured_total != 0:
+            insured_total = insured_total.to_decimal()
         total_difference = limits.total - insured_total - insured
         if total_difference < 0:
             insured += total_difference