refactor

cashu/core/helpers.py

@@ -0,0 +1,35 @@
+import asyncio
+from functools import partial, wraps
+
+from cashu.core.settings import LIGHTNING_FEE_PERCENT, LIGHTNING_RESERVE_FEE_MIN
+
+
+def async_wrap(func):
+    @wraps(func)
+    async def run(*args, loop=None, executor=None, **kwargs):
+        if loop is None:
+            loop = asyncio.get_event_loop()
+        partial_func = partial(func, *args, **kwargs)
+        return await loop.run_in_executor(executor, partial_func)
+
+    return run
+
+
+def async_unwrap(to_await):
+    async_response = []
+
+    async def run_and_capture_result():
+        r = await to_await
+        async_response.append(r)
+
+    loop = asyncio.get_event_loop()
+    coroutine = run_and_capture_result()
+    loop.run_until_complete(coroutine)
+    return async_response[0]
+
+
+def fee_reserve(amount_msat: int) -> int:
+    """Function for calculating the Lightning fee reserve"""
+    return max(
+        int(LIGHTNING_RESERVE_FEE_MIN), int(amount_msat * LIGHTNING_FEE_PERCENT / 100.0)
+    )