mirror of
https://github.com/lnbits/lnbits-legend.git
synced 2025-02-22 22:25:47 +01:00
220 lines
8 KiB
Python
220 lines
8 KiB
Python
import asyncio
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import base64
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import hashlib
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import json
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from typing import AsyncGenerator, Dict, Optional
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import httpx
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from loguru import logger
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from lnbits.settings import settings
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from .base import (
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InvoiceResponse,
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PaymentResponse,
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PaymentStatus,
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StatusResponse,
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Wallet,
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)
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from .macaroon import AESCipher, load_macaroon
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class LndRestWallet(Wallet):
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"""https://api.lightning.community/rest/index.html#lnd-rest-api-reference"""
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def __init__(self):
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endpoint = settings.lnd_rest_endpoint
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endpoint = endpoint[:-1] if endpoint.endswith("/") else endpoint
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endpoint = (
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"https://" + endpoint if not endpoint.startswith("http") else endpoint
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)
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self.endpoint = endpoint
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macaroon = (
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settings.lnd_rest_macaroon
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or settings.lnd_admin_macaroon
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or settings.lnd_rest_admin_macaroon
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or settings.lnd_invoice_macaroon
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or settings.lnd_rest_invoice_macaroon
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)
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encrypted_macaroon = settings.lnd_rest_macaroon_encrypted
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if encrypted_macaroon:
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macaroon = AESCipher(description="macaroon decryption").decrypt(
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encrypted_macaroon
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)
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self.macaroon = load_macaroon(macaroon)
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self.auth = {"Grpc-Metadata-macaroon": self.macaroon}
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self.cert = settings.lnd_rest_cert
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async def status(self) -> StatusResponse:
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try:
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async with httpx.AsyncClient(verify=self.cert) as client:
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r = await client.get(
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f"{self.endpoint}/v1/balance/channels", headers=self.auth
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)
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except (httpx.ConnectError, httpx.RequestError):
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return StatusResponse(f"Unable to connect to {self.endpoint}.", 0)
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try:
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data = r.json()
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if r.is_error:
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raise Exception
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except Exception:
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return StatusResponse(r.text[:200], 0)
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return StatusResponse(None, int(data["balance"]) * 1000)
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async def create_invoice(
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self,
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amount: int,
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memo: Optional[str] = None,
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description_hash: Optional[bytes] = None,
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unhashed_description: Optional[bytes] = None,
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**kwargs,
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) -> InvoiceResponse:
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data: Dict = {"value": amount, "private": True}
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if kwargs.get("expiry"):
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data["expiry"] = kwargs["expiry"]
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if description_hash:
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data["description_hash"] = base64.b64encode(description_hash).decode(
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"ascii"
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)
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elif unhashed_description:
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data["description_hash"] = base64.b64encode(
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hashlib.sha256(unhashed_description).digest()
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).decode("ascii")
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else:
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data["memo"] = memo or ""
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async with httpx.AsyncClient(verify=self.cert) as client:
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r = await client.post(
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url=f"{self.endpoint}/v1/invoices", headers=self.auth, json=data
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)
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if r.is_error:
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error_message = r.text
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try:
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error_message = r.json()["error"]
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except Exception:
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pass
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return InvoiceResponse(False, None, None, error_message)
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data = r.json()
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payment_request = data["payment_request"]
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payment_hash = base64.b64decode(data["r_hash"]).hex()
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checking_id = payment_hash
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return InvoiceResponse(True, checking_id, payment_request, None)
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async def pay_invoice(self, bolt11: str, fee_limit_msat: int) -> PaymentResponse:
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async with httpx.AsyncClient(verify=self.cert) as client:
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# set the fee limit for the payment
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lnrpcFeeLimit = dict()
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lnrpcFeeLimit["fixed_msat"] = f"{fee_limit_msat}"
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r = await client.post(
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url=f"{self.endpoint}/v1/channels/transactions",
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headers=self.auth,
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json={"payment_request": bolt11, "fee_limit": lnrpcFeeLimit},
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timeout=None,
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)
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if r.is_error or r.json().get("payment_error"):
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error_message = r.json().get("payment_error") or r.text
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return PaymentResponse(False, None, None, None, error_message)
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data = r.json()
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checking_id = base64.b64decode(data["payment_hash"]).hex()
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fee_msat = int(data["payment_route"]["total_fees_msat"])
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preimage = base64.b64decode(data["payment_preimage"]).hex()
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return PaymentResponse(True, checking_id, fee_msat, preimage, None)
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async def get_invoice_status(self, checking_id: str) -> PaymentStatus:
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async with httpx.AsyncClient(verify=self.cert) as client:
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r = await client.get(
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url=f"{self.endpoint}/v1/invoice/{checking_id}", headers=self.auth
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)
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if r.is_error or not r.json().get("settled"):
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# this must also work when checking_id is not a hex recognizable by lnd
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# it will return an error and no "settled" attribute on the object
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return PaymentStatus(None)
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return PaymentStatus(True)
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async def get_payment_status(self, checking_id: str) -> PaymentStatus:
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"""
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This routine checks the payment status using routerpc.TrackPaymentV2.
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"""
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# convert checking_id from hex to base64 and some LND magic
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try:
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checking_id = base64.urlsafe_b64encode(bytes.fromhex(checking_id)).decode(
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"ascii"
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)
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except ValueError:
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return PaymentStatus(None)
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url = f"{self.endpoint}/v2/router/track/{checking_id}"
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# check payment.status:
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# https://api.lightning.community/?python=#paymentpaymentstatus
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statuses = {
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"UNKNOWN": None,
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"IN_FLIGHT": None,
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"SUCCEEDED": True,
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"FAILED": False,
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}
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async with httpx.AsyncClient(
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timeout=None, headers=self.auth, verify=self.cert
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) as client:
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async with client.stream("GET", url) as r:
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async for l in r.aiter_lines():
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try:
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line = json.loads(l)
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if line.get("error"):
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logger.error(
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line["error"]["message"]
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if "message" in line["error"]
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else line["error"]
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)
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return PaymentStatus(None)
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payment = line.get("result")
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if payment is not None and payment.get("status"):
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return PaymentStatus(
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paid=statuses[payment["status"]],
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fee_msat=payment.get("fee_msat"),
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preimage=payment.get("payment_preimage"),
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)
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else:
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return PaymentStatus(None)
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except:
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continue
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return PaymentStatus(None)
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async def paid_invoices_stream(self) -> AsyncGenerator[str, None]:
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while True:
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try:
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url = self.endpoint + "/v1/invoices/subscribe"
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async with httpx.AsyncClient(
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timeout=None, headers=self.auth, verify=self.cert
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) as client:
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async with client.stream("GET", url) as r:
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async for line in r.aiter_lines():
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try:
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inv = json.loads(line)["result"]
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if not inv["settled"]:
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continue
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except:
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continue
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payment_hash = base64.b64decode(inv["r_hash"]).hex()
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yield payment_hash
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except Exception as exc:
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logger.error(
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f"lost connection to lnd invoices stream: '{exc}', retrying in 5 seconds"
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)
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await asyncio.sleep(5)
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