mirror of
https://github.com/RoboSats/robosats.git
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221 lines
8.9 KiB
Python
221 lines
8.9 KiB
Python
import grpc, os, hashlib, secrets, json
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from . import lightning_pb2 as lnrpc, lightning_pb2_grpc as lightningstub
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from . import invoices_pb2 as invoicesrpc, invoices_pb2_grpc as invoicesstub
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from . import router_pb2 as routerrpc, router_pb2_grpc as routerstub
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from decouple import config
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from base64 import b64decode
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from datetime import timedelta, datetime
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from django.utils import timezone
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#######
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# Should work with LND (c-lightning in the future if there are features that deserve the work)
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#######
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CERT = b64decode(config('LND_CERT_BASE64'))
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MACAROON = b64decode(config('LND_MACAROON_BASE64'))
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LND_GRPC_HOST = config('LND_GRPC_HOST')
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class LNNode():
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os.environ["GRPC_SSL_CIPHER_SUITES"] = 'HIGH+ECDSA'
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creds = grpc.ssl_channel_credentials(CERT)
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channel = grpc.secure_channel(LND_GRPC_HOST, creds)
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lightningstub = lightningstub.LightningStub(channel)
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invoicesstub = invoicesstub.InvoicesStub(channel)
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routerstub = routerstub.RouterStub(channel)
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payment_failure_context = {
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0: "Payment isn't failed (yet)",
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1: "There are more routes to try, but the payment timeout was exceeded.",
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2: "All possible routes were tried and failed permanently. Or were no routes to the destination at all.",
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3: "A non-recoverable error has occured.",
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4: "Payment details incorrect (unknown hash, invalid amt or invalid final cltv delta)",
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5: "Insufficient local balance."}
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@classmethod
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def decode_payreq(cls, invoice):
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'''Decodes a lightning payment request (invoice)'''
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request = lnrpc.PayReqString(pay_req=invoice)
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response = cls.lightningstub.DecodePayReq(request, metadata=[('macaroon', MACAROON.hex())])
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return response
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@classmethod
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def cancel_return_hold_invoice(cls, payment_hash):
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'''Cancels or returns a hold invoice'''
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request = invoicesrpc.CancelInvoiceMsg(payment_hash=bytes.fromhex(payment_hash))
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response = cls.invoicesstub.CancelInvoice(request, metadata=[('macaroon', MACAROON.hex())])
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# Fix this: tricky because canceling sucessfully an invoice has no response. TODO
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return str(response) == "" # True if no response, false otherwise.
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@classmethod
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def settle_hold_invoice(cls, preimage):
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'''settles a hold invoice'''
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request = invoicesrpc.SettleInvoiceMsg(preimage=bytes.fromhex(preimage))
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response = cls.invoicesstub.SettleInvoice(request, metadata=[('macaroon', MACAROON.hex())])
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# Fix this: tricky because settling sucessfully an invoice has None response. TODO
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return str(response)=="" # True if no response, false otherwise.
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@classmethod
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def gen_hold_invoice(cls, num_satoshis, description, expiry):
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'''Generates hold invoice'''
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hold_payment = {}
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# The preimage is a random hash of 256 bits entropy
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preimage = hashlib.sha256(secrets.token_bytes(nbytes=32)).digest()
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# Its hash is used to generate the hold invoice
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r_hash = hashlib.sha256(preimage).digest()
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request = invoicesrpc.AddHoldInvoiceRequest(
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memo=description,
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value=num_satoshis,
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hash=r_hash,
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expiry=expiry)
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response = cls.invoicesstub.AddHoldInvoice(request, metadata=[('macaroon', MACAROON.hex())])
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hold_payment['invoice'] = response.payment_request
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payreq_decoded = cls.decode_payreq(hold_payment['invoice'])
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hold_payment['preimage'] = preimage.hex()
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hold_payment['payment_hash'] = payreq_decoded.payment_hash
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hold_payment['created_at'] = timezone.make_aware(datetime.fromtimestamp(payreq_decoded.timestamp))
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hold_payment['expires_at'] = hold_payment['created_at'] + timedelta(seconds=payreq_decoded.expiry)
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return hold_payment
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@classmethod
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def validate_hold_invoice_locked(cls, payment_hash):
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'''Checks if hold invoice is locked'''
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request = invoicesrpc.LookupInvoiceMsg(payment_hash=bytes.fromhex(payment_hash))
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response = cls.invoicesstub.LookupInvoiceV2(request, metadata=[('macaroon', MACAROON.hex())])
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print('status here')
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print(response.state)
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# TODO ERROR HANDLING
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if response.state == 0: # OPEN
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print('STATUS: OPEN')
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pass
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if response.state == 1: # SETTLED
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pass
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if response.state == 2: # CANCELLED
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pass
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if response.state == 3: # ACCEPTED (LOCKED)
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print('STATUS: ACCEPTED')
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return True
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@classmethod
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def check_until_invoice_locked(cls, payment_hash, expiration):
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'''Checks until hold invoice is locked.
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When invoice is locked, returns true.
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If time expires, return False.'''
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# Experimental, might need asyncio. Best if subscribing all invoices and running a background task
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# Maybe best to pass LNpayment object and change status live.
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request = invoicesrpc.SubscribeSingleInvoiceRequest(r_hash=payment_hash)
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for invoice in cls.invoicesstub.SubscribeSingleInvoice(request):
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print(invoice)
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if timezone.now > expiration:
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break
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if invoice.state == 3: # True if hold invoice is accepted.
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return True
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return False
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@classmethod
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def validate_ln_invoice(cls, invoice, num_satoshis):
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'''Checks if the submited LN invoice comforms to expectations'''
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buyer_invoice = {
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'valid': False,
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'context': None,
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'description': None,
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'payment_hash': None,
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'created_at': None,
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'expires_at': None,
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}
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try:
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payreq_decoded = cls.decode_payreq(invoice)
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print(payreq_decoded)
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except:
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buyer_invoice['context'] = {'bad_invoice':'Does not look like a valid lightning invoice'}
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return buyer_invoice
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if payreq_decoded.num_satoshis == 0:
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buyer_invoice['context'] = {'bad_invoice':'The invoice provided has no explicit amount'}
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return buyer_invoice
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if not payreq_decoded.num_satoshis == num_satoshis:
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buyer_invoice['context'] = {'bad_invoice':'The invoice provided is not for '+'{:,}'.format(num_satoshis)+ ' Sats'}
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return buyer_invoice
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buyer_invoice['created_at'] = timezone.make_aware(datetime.fromtimestamp(payreq_decoded.timestamp))
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buyer_invoice['expires_at'] = buyer_invoice['created_at'] + timedelta(seconds=payreq_decoded.expiry)
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if buyer_invoice['expires_at'] < timezone.now():
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buyer_invoice['context'] = {'bad_invoice':f'The invoice provided has already expired'}
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return buyer_invoice
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buyer_invoice['valid'] = True
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buyer_invoice['description'] = payreq_decoded.description
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buyer_invoice['payment_hash'] = payreq_decoded.payment_hash
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return buyer_invoice
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@classmethod
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def pay_invoice(cls, invoice, num_satoshis):
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'''Sends sats to buyer'''
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fee_limit_sat = max(num_satoshis * 0.0002, 10) # 200 ppm or 10 sats
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request = routerrpc.SendPaymentRequest(
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payment_request=invoice,
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fee_limit_sat=fee_limit_sat,
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timeout_seconds=60)
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for response in cls.routerstub.SendPaymentV2(request, metadata=[('macaroon', MACAROON.hex())]):
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print(response)
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print(response.status)
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# TODO ERROR HANDLING
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if response.status == 0 : # Status 0 'UNKNOWN'
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pass
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if response.status == 1 : # Status 1 'IN_FLIGHT'
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return True, 'In flight'
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if response.status == 3 : # 4 'FAILED' ??
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'''0 Payment isn't failed (yet).
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1 There are more routes to try, but the payment timeout was exceeded.
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2 All possible routes were tried and failed permanently. Or were no routes to the destination at all.
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3 A non-recoverable error has occured.
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4 Payment details incorrect (unknown hash, invalid amt or invalid final cltv delta)
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5 Insufficient local balance.
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'''
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context = cls.payment_failure_context[response.failure_reason]
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return False, context
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if response.status == 2 : # STATUS 'SUCCEEDED'
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return True, None
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# How to catch the errors like:"grpc_message":"invoice is already paid","grpc_status":6}
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# These are not in the response only printed to commandline
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return False
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@classmethod
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def double_check_htlc_is_settled(cls, payment_hash):
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''' Just as it sounds. Better safe than sorry!'''
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request = invoicesrpc.LookupInvoiceMsg(payment_hash=bytes.fromhex(payment_hash))
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response = cls.invoicesstub.LookupInvoiceV2(request, metadata=[('macaroon', MACAROON.hex())])
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return response.state == 1 # LND states: 0 OPEN, 1 SETTLED, 3 ACCEPTED, GRPC_ERROR status 5 when cancelled/returned
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