Allow multiple takers

api/lightning/cln.py

@@ -1,5 +1,6 @@
 import hashlib
 import os
+import random
 import secrets
 import struct
 import time
@@ -273,7 +274,7 @@ def gen_hold_invoice(
         request = hold_pb2.HoldInvoiceRequest(
             description=description,
             amount_msat=hold_pb2.Amount(msat=num_satoshis * 1_000),
-            label=f"Order:{order_id}-{lnpayment_concept}-{time}",
+            label=f"Order:{order_id}-{lnpayment_concept}-{time}--{random.randint(1, 100000)}",
             expiry=invoice_expiry,
             cltv=cltv_expiry_blocks,
             preimage=preimage,  # preimage is actually optional in cln, as cln would generate one by default

api/management/commands/clean_orders.py

@@ -4,7 +4,7 @@
 from django.utils import timezone
 
 from api.logics import Logics
-from api.models import Order
+from api.models import Order, TakeOrder
 
 
 class Command(BaseCommand):
@@ -44,6 +44,15 @@ def clean_orders(self):
                 if Logics.order_expires(order):  # Order send to expire here
                     debug["expired_orders"].append({idx: context})
 
+                    # expire all related take orders
+                    take_orders_queryset = TakeOrder.objects.filter(
+                        order=order, expires_at__gt=timezone.now()
+                    )
+                    for idx, take_order in enumerate(take_orders_queryset):
+                        take_order.expires_at = order.expires_at
+                        take_order.save()
+                        Logics.take_order_expires(take_order)
+
             # It should not happen, but if it cannot locate the hold invoice
             # it probably was cancelled by another thread, make it expire anyway.
             except Exception as e:
@@ -59,6 +68,34 @@ def clean_orders(self):
             self.stdout.write(str(timezone.now()))
             self.stdout.write(str(debug))
 
+        take_orders_queryset = TakeOrder.objects.filter(expires_at__lt=timezone.now())
+        debug["num_expired_take_orders"] = len(take_orders_queryset)
+        debug["expired_take_orders"] = []
+        debug["failed_take_order_expiry"] = []
+        debug["reason_take_failure"] = []
+
+        for idx, take_order in enumerate(take_orders_queryset):
+            context = str(take_order) + " was expired"
+            try:
+                if Logics.take_order_expires(
+                    take_order
+                ):  # Take order send to expire here
+                    debug["expired_take_orders"].append({idx: context})
+
+            # It should not happen, but if it cannot locate the hold invoice
+            # it probably was cancelled by another thread, make it expire anyway.
+            except Exception as e:
+                debug["failed_take_order_expiry"].append({idx: context})
+                debug["reason_take_failure"].append({idx: str(e)})
+
+                if "unable to locate invoice" in str(e):
+                    self.stdout.write(str(e))
+                    debug["expired_take_orders"].append({idx: context})
+
+        if debug["num_expired_take_orders"] > 0:
+            self.stdout.write(str(timezone.now()))
+            self.stdout.write(str(debug))
+
     def handle(self, *args, **options):
         """Never mind database locked error, keep going, print them out.
         Not an issue with PostgresQL"""

api/management/commands/follow_invoices.py

@@ -234,12 +234,20 @@ def update_order_status(self, lnpayment):
                     )
                     return
 
-                # It is a taker bond => close contract.
-                elif hasattr(lnpayment, "order_taken"):
-                    if lnpayment.order_taken.status == Order.Status.TAK:
-                        lnpayment.order_taken.log("Taker bond <b>locked</b>")
-                        Logics.finalize_contract(lnpayment.order_taken)
-                        return
+                # It is a taker bond
+                elif hasattr(lnpayment, "take_order"):
+                    if lnpayment.take_order.order.status == Order.Status.PUB:
+                        # It there was no other taker already locked => close contract.
+                        lnpayment.take_order.order.log("Taker bond <b>locked</b>")
+                        Logics.finalize_contract(lnpayment.take_order)
+                    else:
+                        # It there was another taker already locked => cancel bond.
+                        lnpayment.take_order.order.log(
+                            "Another taker bond is already locked, <b>Cancelling</b>"
+                        )
+                        Logics.take_order_expires(lnpayment.take_order)
+
+                    return
 
                 # It is a trade escrow => move foward order status.
                 elif hasattr(lnpayment, "order_escrow"):
@@ -272,14 +280,20 @@ def update_order_status(self, lnpayment):
                 Logics.order_expires(lnpayment.order_made)
                 return
 
-            elif hasattr(lnpayment, "order_taken"):
-                Logics.order_expires(lnpayment.order_taken)
+            elif hasattr(lnpayment, "take_order"):
+                Logics.take_order_expires(lnpayment.take_order)
+                if hasattr(lnpayment, "order_taken"):
+                    Logics.order_expires(lnpayment.order_taken)
                 return
 
             elif hasattr(lnpayment, "order_escrow"):
                 Logics.order_expires(lnpayment.order_escrow)
                 return
 
+            elif hasattr(lnpayment, "take_order"):
+                Logics.take_order_expires(lnpayment.order_escrow)
+                return
+
         # TODO If a lnpayment goes from LOCKED to INVGEN. Totally weird
         # halt the order
         elif lnpayment.status == LNPayment.Status.INVGEN:

api/migrations/0051_takeorder.py

@@ -0,0 +1,30 @@
+# Generated by Django 5.1.4 on 2025-02-24 13:10
+
+import django.core.validators
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0050_alter_order_status'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='TakeOrder',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('amount', models.DecimalField(blank=True, decimal_places=8, max_digits=18, null=True)),
+                ('expires_at', models.DateTimeField()),
+                ('last_satoshis', models.PositiveBigIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(10000000)])),
+                ('last_satoshis_time', models.DateTimeField(blank=True, default=None, null=True)),
+                ('order', models.ForeignKey(blank=True, default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='order', to='api.order')),
+                ('taker', models.ForeignKey(default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='pretaker', to=settings.AUTH_USER_MODEL)),
+                ('taker_bond', models.OneToOneField(blank=True, default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, to='api.lnpayment')),
+            ],
+        ),
+    ]

api/models/__init__.py

@@ -5,6 +5,7 @@
 from .order import Order
 from .robot import Robot
 from .notification import Notification
+from .take_order import TakeOrder
 
 __all__ = [
     "Currency",
@@ -14,4 +15,5 @@
     "Order",
     "Robot",
     "Notification",
+    "TakeOrder",
 ]

api/models/take_order.py

@@ -0,0 +1,51 @@
+from django.core.validators import MaxValueValidator, MinValueValidator
+from django.contrib.auth.models import User
+from django.db import models
+from django.conf import settings
+from django.utils import timezone
+
+
+class TakeOrder(models.Model):
+    amount = models.DecimalField(max_digits=18, decimal_places=8, null=True, blank=True)
+    order = models.ForeignKey(
+        "api.Order",
+        related_name="order",
+        on_delete=models.CASCADE,
+        null=False,
+        default=None,
+        blank=False,
+    )
+    taker = models.ForeignKey(
+        User,
+        related_name="pretaker",
+        on_delete=models.CASCADE,
+        null=False,
+        default=None,
+        blank=False,
+    )
+    expires_at = models.DateTimeField()
+    taker_bond = models.OneToOneField(
+        "api.LNPayment",
+        related_name="take_order",
+        on_delete=models.SET_NULL,
+        null=True,
+        default=None,
+        blank=True,
+    )
+    last_satoshis = models.PositiveBigIntegerField(
+        null=True,
+        default=None,
+        validators=[MinValueValidator(0), MaxValueValidator(settings.MAX_TRADE * 2)],
+        blank=True,
+    )
+    # timestamp of last_satoshis
+    last_satoshis_time = models.DateTimeField(null=True, default=None, blank=True)
+
+    def cancel(self, cls):
+        if self.expires_at > timezone.now():
+            self.expires_at = timezone.now()
+            self.save(update_fields=["expires_at"])
+        cls.cancel_bond(self.taker_bond)
+
+    def __str__(self):
+        return f"Order {self.order.id} taken by Robot({self.taker.robot.id},{self.taker.username}) for {self.amount} fiat units"

api/oas_schemas.py

@@ -85,6 +85,7 @@ class OrderViewSchema:
             - `total_secs_exp`
             - `penalty`
             - `is_maker`
+            - `is_pretaker`
             - `is_taker`
             - `is_participant`
             - `maker_status`

api/serializers.py

@@ -199,6 +199,9 @@ class OrderDetailSerializer(serializers.ModelSerializer):
     is_maker = serializers.BooleanField(
         required=False, help_text="Whether you are the maker or not"
     )
+    is_pretaker = serializers.BooleanField(
+        required=False, help_text="Whether you are a pre-taker or not"
+    )
     is_taker = serializers.BooleanField(
         required=False, help_text="Whether you are the taker or not"
     )
@@ -429,6 +432,7 @@ class Meta:
             "total_secs_exp",
             "penalty",
             "is_maker",
+            "is_pretaker",
             "is_taker",
             "is_participant",
             "maker_status",

api/views.py

@@ -23,6 +23,7 @@
     OnchainPayment,
     Order,
     Notification,
+    TakeOrder,
 )
 from api.notifications import Notifications
 from api.oas_schemas import (
@@ -245,10 +246,22 @@ def get(self, request, format=None):
         # Add booleans if user is maker, taker, partipant, buyer or seller
         data["is_maker"] = order.maker == request.user
         data["is_taker"] = order.taker == request.user
-        data["is_participant"] = data["is_maker"] or data["is_taker"]
+        data["is_pretaker"] = (
+            not data["is_taker"]
+            and TakeOrder.objects.filter(
+                taker=request.user, order=order, expires_at__gt=timezone.now()
+            ).exists()
+        )
+        data["is_participant"] = (
+            data["is_maker"] or data["is_taker"] or data["is_pretaker"]
+        )
 
         # 3.a) If not a participant and order is not public, forbid.
-        if not data["is_participant"] and order.status != Order.Status.PUB:
+        if (
+            not data["is_maker"]
+            and not data["is_taker"]
+            and order.status != Order.Status.PUB
+        ):
             return Response(
                 {"bad_request": "This order is not available"},
                 status.HTTP_403_FORBIDDEN,
@@ -355,9 +368,16 @@ def get(self, request, format=None):
             else:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 6)  If status is 'waiting for taker bond' and user is TAKER, reply with a TAKER hold invoice.
-        elif order.status == Order.Status.TAK and data["is_taker"]:
+        # 6)  If status is 'Public' and user is PRETAKER, reply with a TAKER hold invoice.
+        elif (
+            order.status == Order.Status.PUB
+            and data["is_pretaker"]
+            and not data["is_taker"]
+        ):
+            data["total_secs_exp"] = order.t_to_expire(Order.Status.TAK)
+
             valid, context = Logics.gen_taker_hold_invoice(order, request.user)
+
             if valid:
                 data = {**data, **context}
             else:
@@ -547,14 +567,20 @@ def take_update_confirm_dispute_cancel(self, request, format=None):
                     status.HTTP_400_BAD_REQUEST,
                 )
 
+        # 2) If action is cancel
+        elif action == "cancel":
+            valid, context = Logics.cancel_order(order, request.user)
+            if not valid:
+                return Response(context, status.HTTP_400_BAD_REQUEST)
+
         # Any other action is only allowed if the user is a participant
-        if not (order.maker == request.user or order.taker == request.user):
+        elif not (order.maker == request.user or order.taker == request.user):
             return Response(
                 {"bad_request": "You are not a participant in this order"},
                 status.HTTP_403_FORBIDDEN,
             )
 
-        # 2) If action is 'update invoice'
+        # 3) If action is 'update invoice'
         elif action == "update_invoice":
             # DEPRECATE post v0.5.1.
             valid_signature, invoice = verify_signed_message(
@@ -573,7 +599,7 @@ def take_update_confirm_dispute_cancel(self, request, format=None):
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 2.b) If action is 'update address'
+        # 3.b) If action is 'update address'
         elif action == "update_address":
             valid_signature, address = verify_signed_message(
                 request.user.robot.public_key, pgp_address
@@ -591,25 +617,19 @@ def take_update_confirm_dispute_cancel(self, request, format=None):
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 3) If action is cancel
-        elif action == "cancel":
-            valid, context = Logics.cancel_order(order, request.user)
-            if not valid:
-                return Response(context, status.HTTP_400_BAD_REQUEST)
-
-        # 4) If action is confirm
+        # 5) If action is confirm
         elif action == "confirm":
             valid, context = Logics.confirm_fiat(order, request.user)
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 4.b) If action is confirm
+        # 5.b) If action is confirm
         elif action == "undo_confirm":
             valid, context = Logics.undo_confirm_fiat_sent(order, request.user)
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 5) If action is dispute
+        # 6) If action is dispute
         elif action == "dispute":
             valid, context = Logics.open_dispute(order, request.user)
             if not valid:
@@ -620,18 +640,18 @@ def take_update_confirm_dispute_cancel(self, request, format=None):
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 6) If action is rate
+        # 7) If action is rate
         elif action == "rate_user" and rating:
             """No user rating"""
             pass
 
-        # 7) If action is rate_platform
+        # 8) If action is rate_platform
         elif action == "rate_platform" and rating:
             valid, context = Logics.rate_platform(request.user, rating)
             if not valid:
                 return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 8) If action is rate_platform
+        # 9) If action is rate_platform
         elif action == "pause":
             valid, context = Logics.pause_unpause_public_order(order, request.user)
             if not valid: