changed polling to invoice listener

- fixed issue #213

lnbits/extensions/lnticket/tasks.py

@@ -0,0 +1,34 @@
+import json
+import trio  # type: ignore
+
+from lnbits.core.models import Payment
+from lnbits.core.crud import create_payment
+from lnbits.core import db as core_db
+from lnbits.tasks import register_invoice_listener, internal_invoice_paid
+from lnbits.helpers import urlsafe_short_hash
+
+from .crud import get_ticket, set_ticket_paid
+
+
+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 on_invoice_paid(payment)
+
+async def on_invoice_paid(payment: Payment) -> None:
+    if "lnticket" != payment.extra.get("tag"):
+        # not a lnticket invoice
+        return
+
+    ticket = await get_ticket(payment.payment_hash)
+    if not ticket:
+        print("this should never happen", payment)
+        return
+
+    await payment.set_pending(False)
+    await set_ticket_paid(payment_hash=payment.payment_hash)