Mint: Add clnrest.py Lightning backend (#551)

* log cln error

* return a string

* update corelightningrest to work with latest ver using rune

* fix mpp spec and backend support check

* refactor validation in ledger

* remove weird error

* fix mpp melt model

* corelightningrest.py: Added Multi-Mint payout support
lndrest.py: fix `quote.amount` is not always in sats + better checks

* small fix

* Fix quote.unit str2unit conversion + add missing imports

* settings enable mpp corelightning (default false)

* small fix

* fix `paid_invoice_stream`

* make format

* handle runes

* load rune

* rename to MINT_CORELIGHTNING_REST_RUNE

* try without cert

* port

* try except callback dispatcher

* clean up cln-rest streaming parser

* conftest: mint_corelightning_enable_mpp

* enable mpp in regtest.yaml

* fix error handling clnrest, remove lndrest changes

* CLNRest + CoreLightningRest

* clean up corelightningrest and get last index before starting the stream

* clean up

---------

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

cashu/lightning/corelightningrest.py

@@ -56,7 +56,9 @@ class CoreLightningRestWallet(LightningBackend):
         }
 
         self.cert = settings.mint_corelightning_rest_cert or False
-        self.client = httpx.AsyncClient(verify=self.cert, headers=self.auth)
+        self.client = httpx.AsyncClient(
+            base_url=self.url, verify=self.cert, headers=self.auth
+        )
         self.last_pay_index = 0
         self.statuses = {
             "paid": True,
@@ -72,7 +74,7 @@ class CoreLightningRestWallet(LightningBackend):
             logger.warning(f"Error closing wallet connection: {e}")
 
     async def status(self) -> StatusResponse:
-        r = await self.client.get(f"{self.url}/v1/listFunds", timeout=5)
+        r = await self.client.get("/v1/listFunds", timeout=5)
         r.raise_for_status()
         if r.is_error or "error" in r.json():
             try:
@@ -124,7 +126,7 @@ class CoreLightningRestWallet(LightningBackend):
             data["preimage"] = kwargs["preimage"]
 
         r = await self.client.post(
-            f"{self.url}/v1/invoice/genInvoice",
+            "/v1/invoice/genInvoice",
             data=data,
         )
 
@@ -177,7 +179,7 @@ class CoreLightningRestWallet(LightningBackend):
             )
         fee_limit_percent = fee_limit_msat / invoice.amount_msat * 100
         r = await self.client.post(
-            f"{self.url}/v1/pay",
+            "/v1/pay",
             data={
                 "invoice": quote.request,
                 "maxfeepercent": f"{fee_limit_percent:.11}",
@@ -226,7 +228,7 @@ class CoreLightningRestWallet(LightningBackend):
 
     async def get_invoice_status(self, checking_id: str) -> PaymentStatus:
         r = await self.client.get(
-            f"{self.url}/v1/invoice/listInvoices",
+            "/v1/invoice/listInvoices",
             params={"payment_hash": checking_id},
         )
         try:
@@ -242,7 +244,7 @@ class CoreLightningRestWallet(LightningBackend):
 
     async def get_payment_status(self, checking_id: str) -> PaymentStatus:
         r = await self.client.get(
-            f"{self.url}/v1/pay/listPays",
+            "/v1/pay/listPays",
             params={"payment_hash": checking_id},
         )
         try:
@@ -276,9 +278,17 @@ class CoreLightningRestWallet(LightningBackend):
             return PaymentStatus(paid=None)
 
     async def paid_invoices_stream(self) -> AsyncGenerator[str, None]:
+        # call listinvoices to determine the last pay_index
+        r = await self.client.get("/v1/invoice/listInvoices")
+        r.raise_for_status()
+        data = r.json()
+        if r.is_error or "error" in data:
+            raise Exception("error in cln response")
+        self.last_pay_index = data["invoices"][-1]["pay_index"]
+
         while True:
             try:
-                url = f"{self.url}/v1/invoice/waitAnyInvoice/{self.last_pay_index}"
+                url = f"/v1/invoice/waitAnyInvoice/{self.last_pay_index}"
                 async with self.client.stream("GET", url, timeout=None) as r:
                     async for line in r.aiter_lines():
                         inv = json.loads(line)
@@ -299,7 +309,7 @@ class CoreLightningRestWallet(LightningBackend):
                         # yield payment_hash
                         # hack to return payment_hash if the above shouldn't work
                         r = await self.client.get(
-                            f"{self.url}/v1/invoice/listInvoices",
+                            "/v1/invoice/listInvoices",
                             params={"label": inv["label"]},
                         )
                         paid_invoce = r.json()