mirror of
https://github.com/RoboSats/robosats.git
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216 lines
8.2 KiB
Python
216 lines
8.2 KiB
Python
from django.core.management.base import BaseCommand, CommandError
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from api.lightning.node import LNNode
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from api.tasks import follow_send_payment
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from api.models import LNPayment, Order
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from api.logics import Logics
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from django.utils import timezone
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from datetime import timedelta
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from decouple import config
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from base64 import b64decode
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import time
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MACAROON = b64decode(config("LND_MACAROON_BASE64"))
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class Command(BaseCommand):
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help = "Follows all active hold invoices"
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rest = 5 # seconds between consecutive checks for invoice updates
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def handle(self, *args, **options):
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"""Infinite loop to check invoices and retry payments.
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ever mind database locked error, keep going, print out"""
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while True:
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time.sleep(self.rest)
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try:
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self.follow_hold_invoices()
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except Exception as e:
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self.stdout.write(str(e))
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try:
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self.send_payments()
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except Exception as e:
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self.stdout.write(str(e))
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def follow_hold_invoices(self):
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"""Follows and updates LNpayment objects
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until settled or canceled
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Background: SubscribeInvoices stub iterator would be great to use here.
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However, it only sends updates when the invoice is OPEN (new) or SETTLED.
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We are very interested on the other two states (CANCELLED and ACCEPTED).
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Therefore, this thread (follow_invoices) will iterate over all LNpayment
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objects and do InvoiceLookupV2 every X seconds to update their state 'live'
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"""
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lnd_state_to_lnpayment_status = {
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0: LNPayment.Status.INVGEN, # OPEN
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1: LNPayment.Status.SETLED, # SETTLED
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2: LNPayment.Status.CANCEL, # CANCELLED
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3: LNPayment.Status.LOCKED, # ACCEPTED
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}
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stub = LNNode.invoicesstub
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# time it for debugging
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t0 = time.time()
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queryset = LNPayment.objects.filter(
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type=LNPayment.Types.HOLD,
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status__in=[LNPayment.Status.INVGEN, LNPayment.Status.LOCKED],
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)
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debug = {}
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debug["num_active_invoices"] = len(queryset)
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debug["invoices"] = []
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at_least_one_changed = False
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for idx, hold_lnpayment in enumerate(queryset):
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old_status = LNPayment.Status(hold_lnpayment.status).label
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try:
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# this is similar to LNNnode.validate_hold_invoice_locked
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request = LNNode.invoicesrpc.LookupInvoiceMsg(
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payment_hash=bytes.fromhex(hold_lnpayment.payment_hash))
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response = stub.LookupInvoiceV2(request,
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metadata=[("macaroon",
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MACAROON.hex())])
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hold_lnpayment.status = lnd_state_to_lnpayment_status[
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response.state]
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# try saving expiry height
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if hasattr(response, "htlcs"):
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try:
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hold_lnpayment.expiry_height = response.htlcs[
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0].expiry_height
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except:
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pass
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except Exception as e:
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# If it fails at finding the invoice: it has been canceled.
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# In RoboSats DB we make a distinction between cancelled and returned (LND does not)
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if "unable to locate invoice" in str(e):
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self.stdout.write(str(e))
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hold_lnpayment.status = LNPayment.Status.CANCEL
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# LND restarted.
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if "wallet locked, unlock it" in str(e):
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self.stdout.write(
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str(timezone.now()) + " :: Wallet Locked")
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# Other write to logs
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else:
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self.stdout.write(str(e))
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new_status = LNPayment.Status(hold_lnpayment.status).label
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# Only save the hold_payments that change (otherwise this function does not scale)
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changed = not old_status == new_status
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if changed:
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# self.handle_status_change(hold_lnpayment, old_status)
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self.update_order_status(hold_lnpayment)
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hold_lnpayment.save()
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# Report for debugging
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new_status = LNPayment.Status(hold_lnpayment.status).label
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debug["invoices"].append({
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idx: {
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"payment_hash": str(hold_lnpayment.payment_hash),
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"old_status": old_status,
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"new_status": new_status,
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}
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})
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at_least_one_changed = at_least_one_changed or changed
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debug["time"] = time.time() - t0
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if at_least_one_changed:
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self.stdout.write(str(timezone.now()))
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self.stdout.write(str(debug))
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def send_payments(self):
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"""
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Checks for invoices that are due to pay; i.e., INFLIGHT status and 0 routing_attempts.
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Checks if any payment is due for retry, and tries to pay it.
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"""
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queryset = LNPayment.objects.filter(
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type=LNPayment.Types.NORM,
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status=LNPayment.Status.FLIGHT,
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routing_attempts=0,
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)
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queryset_retries = LNPayment.objects.filter(
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type=LNPayment.Types.NORM,
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status__in=[LNPayment.Status.VALIDI, LNPayment.Status.FAILRO],
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routing_attempts__lt=5,
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last_routing_time__lt=(
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timezone.now() - timedelta(minutes=int(config("RETRY_TIME")))),
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)
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queryset = queryset.union(queryset_retries)
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for lnpayment in queryset:
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success, _ = follow_send_payment(
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lnpayment
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) # Do follow_send_payment.delay() for further concurrency.
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# If failed, reset mision control. (This won't scale well, just a temporary fix)
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if not success:
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LNNode.resetmc()
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# If already 3 attempts and last failed. Make it expire (ask for a new invoice) an reset attempts.
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if not success and lnpayment.routing_attempts > 2:
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lnpayment.status = LNPayment.Status.EXPIRE
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lnpayment.routing_attempts = 0
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lnpayment.save()
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def update_order_status(self, lnpayment):
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"""Background process following LND hold invoices
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can catch LNpayments changing status. If they do,
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the order status might have to change too."""
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# If the LNPayment goes to LOCKED (ACCEPTED)
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if lnpayment.status == LNPayment.Status.LOCKED:
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try:
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# It is a maker bond => Publish order.
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if hasattr(lnpayment, "order_made"):
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Logics.publish_order(lnpayment.order_made)
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return
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# It is a taker bond => close contract.
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elif hasattr(lnpayment, "order_taken"):
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if lnpayment.order_taken.status == Order.Status.TAK:
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Logics.finalize_contract(lnpayment.order_taken)
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return
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# It is a trade escrow => move foward order status.
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elif hasattr(lnpayment, "order_escrow"):
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Logics.trade_escrow_received(lnpayment.order_escrow)
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return
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except Exception as e:
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self.stdout.write(str(e))
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# If the LNPayment goes to CANCEL from INVGEN, the invoice had expired
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# If it goes to CANCEL from LOCKED the bond was relased. Order had expired in both cases.
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# Testing needed for end of time trades!
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if lnpayment.status == LNPayment.Status.CANCEL:
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if hasattr(lnpayment, "order_made"):
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Logics.order_expires(lnpayment.order_made)
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return
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elif hasattr(lnpayment, "order_taken"):
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Logics.order_expires(lnpayment.order_taken)
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return
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elif hasattr(lnpayment, "order_escrow"):
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Logics.order_expires(lnpayment.order_escrow)
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return
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# TODO If a lnpayment goes from LOCKED to INVGEN. Totally weird
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# halt the order
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if lnpayment.status == LNPayment.Status.INVGEN:
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pass
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