Mint: Talk to LND via gRPC (#595)

* protos + lnd_grpc.py + __init__ +  status method

* `create_invoice`

* `pay_invoice`, `pay_partial_invoice` and router pb2

* `get_invoice_status`

* channel keep-alive options

* Update lnd_grpc.py

* `get_payment_status` + make format

* `get_payment_quote` and `paid_invoices_stream`. This was suspiciously easy...

* download_and_build script modified to fix the imports on generated code

* pyproject with new dependencies

* update poetry.lock

* fixed errors in `pay_partial_invoice`

* update .env.example

* make format

* enable regtest

* update .env.example

* suggested fixes

* suggested changes pt.2

* Update cashu/core/settings.py

Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>

---------

Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
         python-version: ["3.10"]
         poetry-version: ["1.7.1"]
         backend-wallet-class:
-          ["LndRestWallet", "CLNRestWallet", "CoreLightningRestWallet", "LNbitsWallet"]
+          ["LndRPCWallet", "LndRestWallet", "CLNRestWallet", "CoreLightningRestWallet", "LNbitsWallet"]
         mint-database: ["./test_data/test_mint", "postgres://cashu:cashu@localhost:5432/cashu"]
         # mint-database: ["./test_data/test_mint"]
     with:

.github/workflows/regtest.yml

@@ -52,11 +52,18 @@ jobs:
           MINT_TEST_DATABASE: ${{ inputs.mint-database }}
           TOR: false
           MINT_BACKEND_BOLT11_SAT: ${{ inputs.backend-wallet-class }}
+          # LNbits wallet
           MINT_LNBITS_ENDPOINT: http://localhost:5001
           MINT_LNBITS_KEY: d08a3313322a4514af75d488bcc27eee
+          # LndRestWallet
           MINT_LND_REST_ENDPOINT: https://localhost:8081/
           MINT_LND_REST_CERT: ./regtest/data/lnd-3/tls.cert
           MINT_LND_REST_MACAROON: ./regtest/data/lnd-3/data/chain/bitcoin/regtest/admin.macaroon
+          # LndRPCWallet
+          MINT_LND_RPC_ENDPOINT: localhost:10009
+          MINT_LND_RPC_CERT: ./regtest/data/lnd-3/tls.cert
+          MINT_LND_RPC_MACAROON: ./regtest/data/lnd-3/data/chain/bitcoin/regtest/admin.macaroon
+
           MINT_LND_ENABLE_MPP: true
           #   LND_GRPC_ENDPOINT: localhost
           #   LND_GRPC_PORT: 10009