register channel listeners instead of callbacks.

makes for a little less black magic and more reasonable use of nurseries
and less unnecessary pseudo-requests.

lnbits/extensions/lnurlp/__init__.py

@@ -7,8 +7,8 @@ lnurlp_ext: Blueprint = Blueprint("lnurlp", __name__, static_folder="static", te
 from .views_api import *  # noqa
 from .views import *  # noqa
 from .lnurl import *  # noqa
-from .tasks import on_invoice_paid
+from .tasks import register_listeners
 
-from lnbits.tasks import register_invoice_listener
+from lnbits.tasks import record_async
 
-register_invoice_listener("lnurlp", on_invoice_paid)
+lnurlp_ext.record(record_async(register_listeners))

lnbits/extensions/lnurlp/tasks.py

@@ -1,10 +1,23 @@
+import trio  # type: ignore
 import httpx
 
 from lnbits.core.models import Payment
+from lnbits.tasks import run_on_pseudo_request, register_invoice_listener
 
 from .crud import get_pay_link_by_invoice, mark_webhook_sent
 
 
+async def register_listeners():
+    invoice_paid_chan_send, invoice_paid_chan_recv = trio.open_memory_channel(2)
+    register_invoice_listener(invoice_paid_chan_send)
+    await wait_for_paid_invoices(invoice_paid_chan_recv)
+
+
+async def wait_for_paid_invoices(invoice_paid_chan: trio.MemoryReceiveChannel):
+    async for payment in invoice_paid_chan:
+        await run_on_pseudo_request(on_invoice_paid, payment)
+
+
 async def on_invoice_paid(payment: Payment) -> None:
     islnurlp = "lnurlp" == payment.extra.get("tag")
     if islnurlp: