mirror of
https://github.com/RoboSats/robosats.git
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467 lines
21 KiB
Python
467 lines
21 KiB
Python
from datetime import timedelta
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from django.utils import timezone
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from .lightning.node import LNNode
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from .models import Order, LNPayment, MarketTick, User
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from decouple import config
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from .utils import get_exchange_rate
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import math
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FEE = float(config('FEE'))
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BOND_SIZE = float(config('BOND_SIZE'))
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MARKET_PRICE_API = config('MARKET_PRICE_API')
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ESCROW_USERNAME = config('ESCROW_USERNAME')
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PENALTY_TIMEOUT = int(config('PENALTY_TIMEOUT'))
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MIN_TRADE = int(config('MIN_TRADE'))
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MAX_TRADE = int(config('MAX_TRADE'))
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EXP_MAKER_BOND_INVOICE = int(config('EXP_MAKER_BOND_INVOICE'))
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EXP_TAKER_BOND_INVOICE = int(config('EXP_TAKER_BOND_INVOICE'))
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EXP_TRADE_ESCR_INVOICE = int(config('EXP_TRADE_ESCR_INVOICE'))
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BOND_EXPIRY = int(config('BOND_EXPIRY'))
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ESCROW_EXPIRY = int(config('ESCROW_EXPIRY'))
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class Logics():
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def validate_already_maker_or_taker(user):
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'''Checks if the user is already partipant of an order'''
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queryset = Order.objects.filter(maker=user)
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if queryset.exists():
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return False, {'bad_request':'You are already maker of an order'}
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queryset = Order.objects.filter(taker=user)
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if queryset.exists():
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return False, {'bad_request':'You are already taker of an order'}
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return True, None
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def validate_order_size(order):
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'''Checks if order is withing limits at t0'''
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if order.t0_satoshis > MAX_TRADE:
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return False, {'bad_request': 'Your order is too big. It is worth '+'{:,}'.format(order.t0_satoshis)+' Sats now. But limit is '+'{:,}'.format(MAX_TRADE)+ ' Sats'}
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if order.t0_satoshis < MIN_TRADE:
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return False, {'bad_request': 'Your order is too small. It is worth '+'{:,}'.format(order.t0_satoshis)+' Sats now. But limit is '+'{:,}'.format(MIN_TRADE)+ ' Sats'}
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return True, None
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@classmethod
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def take(cls, order, user):
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is_penalized, time_out = cls.is_penalized(user)
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if is_penalized:
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return False, {'bad_request',f'You need to wait {time_out} seconds to take an order'}
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else:
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order.taker = user
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order.status = Order.Status.TAK
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order.save()
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return True, None
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def is_buyer(order, user):
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is_maker = order.maker == user
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is_taker = order.taker == user
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return (is_maker and order.type == Order.Types.BUY) or (is_taker and order.type == Order.Types.SELL)
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def is_seller(order, user):
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is_maker = order.maker == user
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is_taker = order.taker == user
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return (is_maker and order.type == Order.Types.SELL) or (is_taker and order.type == Order.Types.BUY)
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def satoshis_now(order):
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''' checks trade amount in sats '''
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if order.is_explicit:
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satoshis_now = order.satoshis
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else:
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exchange_rate = get_exchange_rate(Order.currency_dict[str(order.currency)])
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premium_rate = exchange_rate * (1+float(order.premium)/100)
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satoshis_now = (float(order.amount) / premium_rate) * 100*1000*1000
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return int(satoshis_now)
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def price_and_premium_now(order):
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''' computes order premium live '''
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exchange_rate = get_exchange_rate(Order.currency_dict[str(order.currency)])
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if not order.is_explicit:
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premium = order.premium
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price = exchange_rate * (1+float(premium)/100)
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else:
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exchange_rate = get_exchange_rate(Order.currency_dict[str(order.currency)])
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order_rate = float(order.amount) / (float(order.satoshis) / 100000000)
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premium = order_rate / exchange_rate - 1
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premium = int(premium*100) # 2 decimals left
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price = order_rate
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significant_digits = 6
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price = round(price, significant_digits - int(math.floor(math.log10(abs(price)))) - 1)
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return price, premium
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def order_expires(order):
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order.status = Order.Status.EXP
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order.maker = None
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order.taker = None
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order.save()
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@classmethod
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def buyer_invoice_amount(cls, order, user):
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''' Computes buyer invoice amount. Uses order.last_satoshis,
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that is the final trade amount set at Taker Bond time'''
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if cls.is_buyer(order, user):
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invoice_amount = int(order.last_satoshis * (1-FEE)) # Trading FEE is charged here.
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return True, {'invoice_amount': invoice_amount}
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@classmethod
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def update_invoice(cls, order, user, invoice):
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# only the buyer can post a buyer invoice
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if not cls.is_buyer(order, user):
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return False, {'bad_request':'Only the buyer of this order can provide a buyer invoice.'}
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if not order.taker_bond:
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return False, {'bad_request':'Wait for your order to be taken.'}
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if not (order.taker_bond.status == order.maker_bond.status == LNPayment.Status.LOCKED):
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return False, {'bad_request':'You cannot a invoice while bonds are not posted.'}
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num_satoshis = cls.buyer_invoice_amount(order, user)[1]['invoice_amount']
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buyer_invoice = LNNode.validate_ln_invoice(invoice, num_satoshis)
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if not buyer_invoice['valid']:
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return False, buyer_invoice['context']
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order.buyer_invoice, _ = LNPayment.objects.update_or_create(
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concept = LNPayment.Concepts.PAYBUYER,
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type = LNPayment.Types.NORM,
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sender = User.objects.get(username=ESCROW_USERNAME),
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receiver= user,
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# if there is a LNPayment matching these above, it updates that one with defaults below.
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defaults={
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'invoice' : invoice,
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'status' : LNPayment.Status.VALIDI,
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'num_satoshis' : num_satoshis,
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'description' : buyer_invoice['description'],
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'payment_hash' : buyer_invoice['payment_hash'],
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'created_at' : buyer_invoice['created_at'],
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'expires_at' : buyer_invoice['expires_at']}
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)
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# If the order status is 'Waiting for escrow'. Move forward to 'chat'
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if order.status == Order.Status.WFE: order.status = Order.Status.CHA
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# If the order status is 'Waiting for both'. Move forward to 'waiting for escrow'
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if order.status == Order.Status.WF2:
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print(order.trade_escrow)
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if order.trade_escrow:
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if order.trade_escrow.status == LNPayment.Status.LOCKED:
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order.status = Order.Status.CHA
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else:
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order.status = Order.Status.WFE
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order.save()
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return True, None
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@classmethod
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def rate_counterparty(cls, order, user, rating):
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# If the trade is finished
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if order.status > Order.Status.PAY:
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# if maker, rates taker
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if order.maker == user:
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order.taker.profile.total_ratings = order.taker.profile.total_ratings + 1
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last_ratings = list(order.taker.profile.last_ratings).append(rating)
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order.taker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
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# if taker, rates maker
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if order.taker == user:
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order.maker.profile.total_ratings = order.maker.profile.total_ratings + 1
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last_ratings = list(order.maker.profile.last_ratings).append(rating)
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order.maker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
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else:
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return False, {'bad_request':'You cannot rate your counterparty yet.'}
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order.save()
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return True, None
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def is_penalized(user):
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''' Checks if a user that is not participant of orders
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has a limit on taking or making a order'''
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if user.profile.penalty_expiration:
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if user.profile.penalty_expiration > timezone.now():
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time_out = (user.profile.penalty_expiration - timezone.now()).seconds
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return True, time_out
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return False, None
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@classmethod
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def cancel_order(cls, order, user, state=None):
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# 1) When maker cancels before bond
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'''The order never shows up on the book and order
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status becomes "cancelled". That's it.'''
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if order.status == Order.Status.WFB and order.maker == user:
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order.maker = None
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order.status = Order.Status.UCA
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order.save()
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return True, None
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# 2) When maker cancels after bond
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'''The order dissapears from book and goes to cancelled.
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Maker is charged the bond to prevent DDOS
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on the LN node and order book. TODO Only charge a small part
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of the bond (requires maker submitting an invoice)'''
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elif order.status == Order.Status.PUB and order.maker == user:
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#Settle the maker bond (Maker loses the bond for a public order)
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valid = cls.settle_maker_bond(order)
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if valid:
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order.maker = None
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order.status = Order.Status.UCA
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order.save()
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return True, None
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# 3) When taker cancels before bond
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''' The order goes back to the book as public.
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LNPayment "order.taker_bond" is deleted() '''
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elif order.status == Order.Status.TAK and order.taker == user:
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# adds a timeout penalty
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user.profile.penalty_expiration = timezone.now() + timedelta(seconds=PENALTY_TIMEOUT)
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user.save()
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order.taker = None
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order.status = Order.Status.PUB
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order.save()
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return True, None
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# 4) When taker or maker cancel after bond (before escrow)
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'''The order goes into cancelled status if maker cancels.
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The order goes into the public book if taker cancels.
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In both cases there is a small fee.'''
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# 4.a) When maker cancel after bond (before escrow)
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'''The order into cancelled status if maker cancels.'''
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elif order.status > Order.Status.PUB and order.status < Order.Status.CHA and order.maker == user:
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#Settle the maker bond (Maker loses the bond for canceling an ongoing trade)
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valid = cls.settle_maker_bond(order)
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if valid:
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order.maker = None
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order.status = Order.Status.UCA
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order.save()
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return True, None
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# 4.b) When taker cancel after bond (before escrow)
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'''The order into cancelled status if maker cancels.'''
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elif order.status > Order.Status.TAK and order.status < Order.Status.CHA and order.taker == user:
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#Settle the maker bond (Maker loses the bond for canceling an ongoing trade)
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valid = cls.settle_taker_bond(order)
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if valid:
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order.taker = None
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order.status = Order.Status.PUB
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# order.taker_bond = None # TODO fix this, it overrides the information about the settled taker bond. Might make admin tasks hard.
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order.save()
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return True, None
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# 5) When trade collateral has been posted (after escrow)
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'''Always goes to cancelled status. Collaboration is needed.
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When a user asks for cancel, 'order.is_pending_cancel' goes True.
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When the second user asks for cancel. Order is totally cancelled.
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Has a small cost for both parties to prevent node DDOS.'''
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else:
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return False, {'bad_request':'You cannot cancel this order'}
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@classmethod
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def gen_maker_hold_invoice(cls, order, user):
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# Do not gen and cancel if order is more than 5 minutes old
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if order.expires_at < timezone.now():
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cls.order_expires(order)
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return False, {'bad_request':'Invoice expired. You did not confirm publishing the order in time. Make a new order.'}
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# Return the previous invoice if there was one and is still unpaid
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if order.maker_bond:
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if order.maker_bond.status == LNPayment.Status.INVGEN:
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return True, {'bond_invoice':order.maker_bond.invoice,'bond_satoshis':order.maker_bond.num_satoshis}
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else:
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return False, None
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order.last_satoshis = cls.satoshis_now(order)
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bond_satoshis = int(order.last_satoshis * BOND_SIZE)
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description = f"RoboSats - Publishing '{str(order)}' - This is a maker bond. It will automatically return if you do not cancel or cheat"
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# Gen hold Invoice
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hold_payment = LNNode.gen_hold_invoice(bond_satoshis, description, BOND_EXPIRY*3600)
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order.maker_bond = LNPayment.objects.create(
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concept = LNPayment.Concepts.MAKEBOND,
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type = LNPayment.Types.HOLD,
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sender = user,
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receiver = User.objects.get(username=ESCROW_USERNAME),
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invoice = hold_payment['invoice'],
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preimage = hold_payment['preimage'],
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status = LNPayment.Status.INVGEN,
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num_satoshis = bond_satoshis,
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description = description,
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payment_hash = hold_payment['payment_hash'],
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created_at = hold_payment['created_at'],
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expires_at = hold_payment['expires_at'])
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order.save()
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return True, {'bond_invoice':hold_payment['invoice'], 'bond_satoshis':bond_satoshis}
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@classmethod
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def gen_taker_hold_invoice(cls, order, user):
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# Do not gen and cancel if a taker invoice is there and older than X minutes and unpaid still
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if order.taker_bond:
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# Check if status is INVGEN and still not expired
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if order.taker_bond.status == LNPayment.Status.INVGEN:
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if order.taker_bond.created_at > (timezone.now()+timedelta(minutes=EXP_TAKER_BOND_INVOICE)):
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cls.cancel_order(order, user, 3) # State 3, cancel order before taker bond
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return False, {'bad_request':'Invoice expired. You did not confirm taking the order in time.'}
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# Return the previous invoice there was with INVGEN status
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else:
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return True, {'bond_invoice':order.taker_bond.invoice,'bond_satoshis':order.taker_bond.num_satoshis}
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# Invoice exists, but was already locked or settled
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else:
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return False, None
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order.last_satoshis = cls.satoshis_now(order) # LOCKS THE AMOUNT OF SATOSHIS FOR THE TRADE
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bond_satoshis = int(order.last_satoshis * BOND_SIZE)
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description = f"RoboSats - Taking '{str(order)}' - This is a taker bond. It will automatically return if you do not cancel or cheat"
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# Gen hold Invoice
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hold_payment = LNNode.gen_hold_invoice(bond_satoshis, description, BOND_EXPIRY*3600)
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order.taker_bond = LNPayment.objects.create(
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concept = LNPayment.Concepts.TAKEBOND,
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type = LNPayment.Types.HOLD,
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sender = user,
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receiver = User.objects.get(username=ESCROW_USERNAME),
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invoice = hold_payment['invoice'],
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preimage = hold_payment['preimage'],
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status = LNPayment.Status.INVGEN,
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num_satoshis = bond_satoshis,
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description = description,
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payment_hash = hold_payment['payment_hash'],
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created_at = hold_payment['created_at'],
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expires_at = hold_payment['expires_at'])
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# Extend expiry time to allow for escrow deposit
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## Not here, on func for confirming taker collar. order.expires_at = timezone.now() + timedelta(minutes=EXP_TRADE_ESCR_INVOICE)
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order.save()
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return True, {'bond_invoice': hold_payment['invoice'], 'bond_satoshis': bond_satoshis}
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@classmethod
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def gen_escrow_hold_invoice(cls, order, user):
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# Do not generate and cancel if an invoice is there and older than X minutes and unpaid still
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if order.trade_escrow:
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# Check if status is INVGEN and still not expired
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if order.trade_escrow.status == LNPayment.Status.INVGEN:
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if order.trade_escrow.created_at > (timezone.now()+timedelta(minutes=EXP_TRADE_ESCR_INVOICE)): # Expired
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cls.cancel_order(order, user, 4) # State 4, cancel order before trade escrow locked
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return False, {'bad_request':'Invoice expired. You did not lock the trade escrow in time.'}
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# Return the previous invoice there was with INVGEN status
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else:
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return True, {'escrow_invoice': order.trade_escrow.invoice, 'escrow_satoshis':order.trade_escrow.num_satoshis}
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# Invoice exists, but was already locked or settled
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else:
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return False, None # Does not return any context of a healthy locked escrow
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escrow_satoshis = order.last_satoshis # Trade sats amount was fixed at the time of taker bond generation (order.last_satoshis)
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description = f"RoboSats - Escrow amount for '{str(order)}' - The escrow will be released to the buyer once you confirm you received the fiat. It will automatically return if buyer does not pay."
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# Gen hold Invoice
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hold_payment = LNNode.gen_hold_invoice(escrow_satoshis, description, ESCROW_EXPIRY*3600)
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order.trade_escrow = LNPayment.objects.create(
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concept = LNPayment.Concepts.TRESCROW,
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type = LNPayment.Types.HOLD,
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sender = user,
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receiver = User.objects.get(username=ESCROW_USERNAME),
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invoice = hold_payment['invoice'],
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preimage = hold_payment['preimage'],
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status = LNPayment.Status.INVGEN,
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num_satoshis = escrow_satoshis,
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description = description,
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payment_hash = hold_payment['payment_hash'],
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created_at = hold_payment['created_at'],
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expires_at = hold_payment['expires_at'])
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order.save()
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return True, {'escrow_invoice':hold_payment['invoice'],'escrow_satoshis': escrow_satoshis}
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def settle_escrow(order):
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''' Settles the trade escrow hold invoice'''
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# TODO ERROR HANDLING
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valid = LNNode.settle_hold_invoice(order.trade_escrow.preimage)
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if valid:
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order.trade_escrow.status = LNPayment.Status.SETLED
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order.save()
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return valid
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def settle_maker_bond(order):
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''' Settles the maker bond hold invoice'''
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# TODO ERROR HANDLING
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valid = LNNode.settle_hold_invoice(order.maker_bond.preimage)
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if valid:
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order.maker_bond.status = LNPayment.Status.SETLED
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order.save()
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return valid
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def settle_taker_bond(order):
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''' Settles the taker bond hold invoice'''
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# TODO ERROR HANDLING
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valid = LNNode.settle_hold_invoice(order.taker_bond.preimage)
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if valid:
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order.taker_bond.status = LNPayment.Status.SETLED
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order.save()
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return valid
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def pay_buyer_invoice(order):
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''' Pay buyer invoice'''
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# TODO ERROR HANDLING
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valid = LNNode.pay_invoice(order.buyer_invoice.invoice)
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return valid
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@classmethod
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def confirm_fiat(cls, order, user):
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''' If Order is in the CHAT states:
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If user is buyer: mark FIAT SENT and settle escrow!
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If User is the seller and FIAT is SENT: Pay buyer invoice!'''
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if order.status == Order.Status.CHA or order.status == Order.Status.FSE: # TODO Alternatively, if all collateral is locked? test out
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# If buyer, settle escrow and mark fiat sent
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if cls.is_buyer(order, user):
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if cls.settle_escrow(order): ##### !!! KEY LINE - SETTLES THE TRADE ESCROW !!!
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order.trade_escrow.status = LNPayment.Status.SETLED
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order.status = Order.Status.FSE
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order.is_fiat_sent = True
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# If seller and fiat sent, pay buyer invoice
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elif cls.is_seller(order, user):
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if not order.is_fiat_sent:
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return False, {'bad_request':'You cannot confirm to have received the fiat before it is confirmed to be sent by the buyer.'}
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# Make sure the trade escrow is at least as big as the buyer invoice
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if order.trade_escrow.num_satoshis > order.buyer_invoice.num_satoshis:
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return False, {'bad_request':'Woah, something broke badly. Report in the public channels, or open a Github Issue.'}
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# Double check the escrow is settled.
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if LNNode.double_check_htlc_is_settled(order.trade_escrow.payment_hash):
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if cls.pay_buyer_invoice(order): ##### !!! KEY LINE - PAYS THE BUYER INVOICE !!!
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order.status = Order.Status.PAY
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order.buyer_invoice.status = LNPayment.Status.PAYING
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else:
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return False, {'bad_request':'You cannot confirm the fiat payment at this stage'}
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order.save()
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return True, None |