WIP: New melt flow (#622)

* `PaymentResult`

* ledger: rely on PaymentResult instead of paid flag. Double check for payments marked pending.

* `None` is `PENDING`

* make format

* reflected changes API tests where `PaymentStatus` is used + reflected changes in lnbits

* reflect changes in blink backend and tests

* fix lnbits get_payment_status

* remove paid flag

* fix mypy

* remove more paid flags

* fix strike mypy

* green

* shorten all state checks

* fix

* fix some tests

* gimme ✅

* fix............

* fix lnbits

* fix error

* lightning refactor

* add more regtest tests

* add tests for pending state and failure

* shorten checks

* use match case for startup check - and remember modified checking_id from pay_invoice

* fix strike pending return

* new tests?

* refactor startup routine into get_melt_quote

* test with purge

* refactor blink

* cleanup responses

* blink: return checking_id on failure

* fix lndgrpc try except

* add more testing for melt branches

* speed things up a bit

* remove comments

* remove comments

* block pending melt quotes

* remove comments

---------

Co-authored-by: lollerfirst <lollerfirst@gmail.com>

tests/test_wallet_api.py

@@ -4,7 +4,7 @@ import pytest
 import pytest_asyncio
 from fastapi.testclient import TestClient
 
-from cashu.lightning.base import InvoiceResponse, PaymentStatus
+from cashu.lightning.base import InvoiceResponse, PaymentResult, PaymentStatus
 from cashu.wallet.api.app import app
 from cashu.wallet.wallet import Wallet
 from tests.conftest import SERVER_ENDPOINT
@@ -29,8 +29,8 @@ async def test_invoice(wallet: Wallet):
         response = client.post("/lightning/create_invoice?amount=100")
         assert response.status_code == 200
         invoice_response = InvoiceResponse.parse_obj(response.json())
-        state = PaymentStatus(paid=False)
-        while not state.paid:
+        state = PaymentStatus(result=PaymentResult.PENDING)
+        while state.pending:
             print("checking invoice state")
             response2 = client.get(
                 f"/lightning/invoice_state?payment_hash={invoice_response.checking_id}"
@@ -171,8 +171,8 @@ async def test_flow(wallet: Wallet):
         initial_balance = response.json()["balance"]
         response = client.post("/lightning/create_invoice?amount=100")
         invoice_response = InvoiceResponse.parse_obj(response.json())
-        state = PaymentStatus(paid=False)
-        while not state.paid:
+        state = PaymentStatus(result=PaymentResult.PENDING)
+        while state.pending:
             print("checking invoice state")
             response2 = client.get(
                 f"/lightning/invoice_state?payment_hash={invoice_response.checking_id}"