Lazy wallet creation

pyproject.toml

@@ -16,6 +16,7 @@ dependencies = [
     "celery-redbeat==2.3.3",
     "channels>=4.1.0,<5.0.0",
     "channels-redis>=4.2.0,<5.0.0",
+    "circle-developer-controlled-wallets>=9.2.0,<10.0.0",
     "cloudscraper>=1.2.60,<2.0.0",
     "daphne>=4.1.2,<5.0.0",
     "dj-rest-auth[with-social]>=7.0.2,<8.0.0",

src/config/ci/keys.py

@@ -76,3 +76,8 @@
 RESEARCHHUB_JOURNAL_ID = os.environ.get("RESEARCHHUB_JOURNAL_ID", "")
 
 SCRAPER_URL = os.environ.get("SCRAPER_URL", "")
+
+CIRCLE_API_KEY = os.environ.get("CIRCLE_API_KEY", "")
+CIRCLE_ENTITY_SECRET = os.environ.get("CIRCLE_ENTITY_SECRET", "")
+CIRCLE_WALLET_SET_ID = os.environ.get("CIRCLE_WALLET_SET_ID", "")
+CIRCLE_ENTITY_PUBLIC_KEY = os.environ.get("CIRCLE_ENTITY_PUBLIC_KEY", "")

src/config/keys.py

@@ -74,3 +74,8 @@
 RESEARCHHUB_JOURNAL_ID = os.environ.get("RESEARCHHUB_JOURNAL_ID", "")
 
 SCRAPER_URL = os.environ.get("SCRAPER_URL", "")
+
+CIRCLE_API_KEY = os.environ.get("CIRCLE_API_KEY", "")
+CIRCLE_ENTITY_SECRET = os.environ.get("CIRCLE_ENTITY_SECRET", "")
+CIRCLE_WALLET_SET_ID = os.environ.get("CIRCLE_WALLET_SET_ID", "")
+CIRCLE_ENTITY_PUBLIC_KEY = os.environ.get("CIRCLE_ENTITY_PUBLIC_KEY", "")

src/purchase/circle/__init__.py

@@ -0,0 +1,7 @@
+from purchase.circle.client import CircleWalletClient
+from purchase.circle.service import CircleWalletService
+
+__all__ = [
+    "CircleWalletClient",
+    "CircleWalletService",
+]

src/purchase/circle/client.py

@@ -0,0 +1,116 @@
+import logging
+import uuid
+from dataclasses import dataclass
+
+from circle.web3 import utils as circle_utils
+from circle.web3.developer_controlled_wallets.api import WalletsApi
+from circle.web3.developer_controlled_wallets.models import (
+    AccountType,
+    Blockchain,
+    CreateWalletRequest,
+)
+from django.conf import settings
+
+logger = logging.getLogger(__name__)
+
+
+class CircleWalletCreationError(Exception):
+    """Raised when Circle fails to create a wallet."""
+
+    pass
+
+
+class CircleWalletFrozenError(Exception):
+    """Raised when a Circle wallet is in FROZEN state."""
+
+    pass
+
+
+@dataclass
+class CircleWalletResult:
+    """Result of fetching a Circle wallet."""
+
+    wallet_id: str
+    address: str
+    state: str
+
+
+class CircleWalletClient:
+    """
+    Low-level client wrapping the Circle developer-controlled wallets SDK.
+
+    Handles SDK initialization and provides methods for creating and
+    fetching wallets.
+    """
+
+    def __init__(self):
+        self._wallets_api = None
+
+    @property
+    def wallets_api(self):
+        if self._wallets_api is None:
+            api_client = circle_utils.init_developer_controlled_wallets_client(
+                api_key=settings.CIRCLE_API_KEY,
+                entity_secret=settings.CIRCLE_ENTITY_SECRET,
+            )
+            self._wallets_api = WalletsApi(api_client)
+        return self._wallets_api
+
+    def create_wallet(self, idempotency_key: str | None = None) -> str:
+        """
+        Request creation of a new SCA wallet on ETH and BASE.
+
+        Circle wallet creation may be asynchronous. This method returns the
+        wallet ID; the caller should use `get_wallet()` to check if the
+        wallet is LIVE and retrieve the on-chain address.
+
+        Args:
+            idempotency_key: Key to prevent duplicate wallet creation on
+                retries. Auto-generated if not provided.
+
+        Returns:
+            The Circle wallet ID (UUID string).
+
+        Raises:
+            CircleWalletCreationError: If the API returns no wallets.
+        """
+        if not idempotency_key:
+            idempotency_key = uuid.uuid4().hex
+
+        request = CreateWalletRequest(
+            idempotencyKey=idempotency_key,
+            blockchains=[Blockchain.ETH, Blockchain.BASE],
+            walletSetId=settings.CIRCLE_WALLET_SET_ID,
+            accountType=AccountType.SCA,
+            count=1,
+        )
+
+        response = self.wallets_api.create_wallet(request)
+        wallets = response.data.wallets
+
+        if not wallets:
+            raise CircleWalletCreationError(
+                "Circle API returned no wallets in creation response"
+            )
+
+        wallet = wallets[0].actual_instance
+        return wallet.id
+
+    def get_wallet(self, wallet_id: str) -> CircleWalletResult:
+        """
+        Fetch the current state of a Circle wallet.
+
+        Args:
+            wallet_id: The Circle wallet UUID.
+
+        Returns:
+            CircleWalletResult with wallet details.
+        """
+        response = self.wallets_api.get_wallet(wallet_id)
+        wallet = response.data.wallet.actual_instance
+
+        return CircleWalletResult(
+            wallet_id=wallet.id,
+            address=wallet.address,
+            state=wallet.state.value,
+        )

src/purchase/circle/service.py

@@ -0,0 +1,104 @@
+import logging
+from dataclasses import dataclass
+from typing import Optional
+
+from django.db import transaction
+
+from purchase.circle.client import CircleWalletClient, CircleWalletFrozenError
+from purchase.models import Wallet
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class DepositAddressResult:
+    """Result of requesting a user's deposit address."""
+
+    address: str
+    provisioning: bool = False
+
+
+class CircleWalletService:
+    """
+    Service for lazy Circle wallet provisioning.
+
+    When a user requests a deposit address, this service either returns their
+    existing Circle wallet address or provisions a new one via the Circle API.
+    """
+
+    def __init__(self, client: Optional[CircleWalletClient] = None):
+        self.client = client or CircleWalletClient()
+
+    def get_or_create_deposit_address(self, user) -> DepositAddressResult:
+        """
+        Get (or provision) the Circle deposit address for a user.
+
+        Flow:
+        1. If the wallet already has an address with a Circle wallet_type,
+           return it immediately.
+        2. If user has a circle_wallet_id but no address, fetch from Circle.
+        3. If user has neither, create a new Circle wallet and fetch.
+
+        Args:
+            user: The authenticated Django User instance.
+
+        Returns:
+            DepositAddressResult with the on-chain address.
+
+        Raises:
+            CircleWalletFrozenError: If the wallet is not in LIVE state.
+            CircleWalletCreationError: If Circle API fails.
+        """
+        # Phase 1: Lock the wallet row and determine what action is needed.
+        # If we need to create a Circle wallet, do it inside this transaction
+        # so the wallet_id is persisted even if polling later fails.
+        with transaction.atomic():
+            wallet, _ = Wallet.objects.select_for_update().get_or_create(user=user)
+
+            # Already fully provisioned
+            if wallet.circle_wallet_id and wallet.address:
+                return DepositAddressResult(address=wallet.address)
+
+            # No Circle wallet yet — create one and persist the ID
+            if not wallet.circle_wallet_id:
+                self._create_wallet(wallet)
+
+        # Phase 2: Fetch the address outside the transaction so that
+        # a CircleWalletFrozenError does NOT roll back the wallet_id save.
+        return self._fetch_and_store_address(wallet)
+
+    def _create_wallet(self, wallet: Wallet) -> None:
+        """Create a new Circle wallet and store the wallet ID."""
+        idempotency_key = f"rh-wallet-{wallet.pk}"
+        wallet_id = self.client.create_wallet(idempotency_key=idempotency_key)
+
+        wallet.circle_wallet_id = wallet_id
+        wallet.wallet_type = Wallet.WALLET_TYPE_CIRCLE
+        wallet.save(update_fields=["circle_wallet_id", "wallet_type"])
+
+        logger.info(
+            "Circle wallet created for wallet pk=%s, circle_wallet_id=%s",
+            wallet.pk,
+            wallet_id,
+        )
+
+    def _fetch_and_store_address(self, wallet: Wallet) -> DepositAddressResult:
+        """Fetch wallet state from Circle. Store address if LIVE."""
+        result = self.client.get_wallet(wallet.circle_wallet_id)
+
+        if result.state != "LIVE":
+            raise CircleWalletFrozenError(
+                f"Wallet {wallet.circle_wallet_id} is in state "
+                f"'{result.state}', expected LIVE"
+            )
+
+        wallet.address = result.address
+        wallet.save(update_fields=["address"])
+
+        logger.info(
+            "Circle address stored for wallet pk=%s: %s",
+            wallet.pk,
+            result.address,
+        )
+
+        return DepositAddressResult(address=result.address)

src/purchase/circle/tests/test_client.py

@@ -0,0 +1,103 @@
+from unittest.mock import Mock, patch
+
+from django.test import TestCase
+
+from purchase.circle.client import CircleWalletClient, CircleWalletCreationError
+
+
+class TestCircleWalletClient(TestCase):
+    """Tests for CircleWalletClient."""
+
+    def _make_client(self, mock_wallets_api):
+        """Create a CircleWalletClient with a mocked WalletsApi."""
+        client = CircleWalletClient.__new__(CircleWalletClient)
+        client._wallets_api = mock_wallets_api
+        return client
+
+    def _make_wallet_instance(self, **kwargs):
+        """Create a mock wallet actual_instance."""
+        wallet = Mock()
+        wallet.id = kwargs.get("id", "wallet-uuid-1")
+        wallet.address = kwargs.get("address", "0xABC123")
+        wallet.state = kwargs.get("state", Mock(value="LIVE"))
+        return wallet
+
+    def test_create_wallet_returns_wallet_id(self):
+        mock_api = Mock()
+        wallet_instance = self._make_wallet_instance(id="circle-wallet-uuid-1")
+        wallet_wrapper = Mock()
+        wallet_wrapper.actual_instance = wallet_instance
+
+        mock_api.create_wallet.return_value = Mock(data=Mock(wallets=[wallet_wrapper]))
+
+        client = self._make_client(mock_api)
+        wallet_id = client.create_wallet(idempotency_key="test-key-1")
+
+        self.assertEqual(wallet_id, "circle-wallet-uuid-1")
+        mock_api.create_wallet.assert_called_once()
+
+    def test_create_wallet_empty_response_raises(self):
+        mock_api = Mock()
+        mock_api.create_wallet.return_value = Mock(data=Mock(wallets=[]))
+
+        client = self._make_client(mock_api)
+
+        with self.assertRaises(CircleWalletCreationError):
+            client.create_wallet()
+
+    def test_create_wallet_generates_idempotency_key_when_none(self):
+        mock_api = Mock()
+        wallet_instance = self._make_wallet_instance()
+        wallet_wrapper = Mock()
+        wallet_wrapper.actual_instance = wallet_instance
+        mock_api.create_wallet.return_value = Mock(data=Mock(wallets=[wallet_wrapper]))
+
+        client = self._make_client(mock_api)
+        client.create_wallet()
+
+        # Verify create_wallet was called (idempotency key auto-generated)
+        call_args = mock_api.create_wallet.call_args
+        request = call_args[0][0]
+        self.assertIsNotNone(request.idempotency_key)
+
+    def test_get_wallet_live_returns_result(self):
+        mock_api = Mock()
+        live_state = Mock(value="LIVE")
+        # WalletState.LIVE comparison
+        from circle.web3.developer_controlled_wallets.models import WalletState
+
+        wallet_instance = Mock()
+        wallet_instance.id = "wallet-1"
+        wallet_instance.address = "0xabc123"
+        wallet_instance.state = WalletState.LIVE
+
+        wallet_wrapper = Mock()
+        wallet_wrapper.actual_instance = wallet_instance
+        mock_api.get_wallet.return_value = Mock(data=Mock(wallet=wallet_wrapper))
+
+        client = self._make_client(mock_api)
+        result = client.get_wallet("wallet-1")
+
+        self.assertEqual(result.wallet_id, "wallet-1")
+        self.assertEqual(result.address, "0xabc123")
+        self.assertEqual(result.state, "LIVE")
+
+    def test_get_wallet_not_live_returns_result_with_state(self):
+        mock_api = Mock()
+        from circle.web3.developer_controlled_wallets.models import WalletState
+
+        wallet_instance = Mock()
+        wallet_instance.id = "wallet-1"
+        wallet_instance.address = ""
+        wallet_instance.state = WalletState.FROZEN
+
+        wallet_wrapper = Mock()
+        wallet_wrapper.actual_instance = wallet_instance
+        mock_api.get_wallet.return_value = Mock(data=Mock(wallet=wallet_wrapper))
+
+        client = self._make_client(mock_api)
+        result = client.get_wallet("wallet-1")
+
+        self.assertEqual(result.wallet_id, "wallet-1")
+        self.assertEqual(result.address, "")
+        self.assertEqual(result.state, "FROZEN")