feat: add get_open_interest and get_funding_rate to BinanceFuturesClient

Made-with: Cursor

src/exchange.py

@@ -146,3 +146,29 @@ class BinanceFuturesClient:
             )
         except Exception as e:
             logger.warning(f"Algo 주문 전체 취소 실패 (무시): {e}")
+
+    async def get_open_interest(self) -> float | None:
+        """현재 미결제약정(OI)을 조회한다. 오류 시 None 반환."""
+        loop = asyncio.get_event_loop()
+        try:
+            result = await loop.run_in_executor(
+                None,
+                lambda: self.client.futures_open_interest(symbol=self.config.symbol),
+            )
+            return float(result["openInterest"])
+        except Exception as e:
+            logger.warning(f"OI 조회 실패 (무시): {e}")
+            return None
+
+    async def get_funding_rate(self) -> float | None:
+        """현재 펀딩비를 조회한다. 오류 시 None 반환."""
+        loop = asyncio.get_event_loop()
+        try:
+            result = await loop.run_in_executor(
+                None,
+                lambda: self.client.futures_mark_price(symbol=self.config.symbol),
+            )
+            return float(result["lastFundingRate"])
+        except Exception as e:
+            logger.warning(f"펀딩비 조회 실패 (무시): {e}")
+            return None

tests/test_exchange.py

@@ -25,6 +25,21 @@ def client():
     return c
 
 
+@pytest.fixture
+def exchange():
+    os.environ.update({
+        "BINANCE_API_KEY": "test_key",
+        "BINANCE_API_SECRET": "test_secret",
+        "SYMBOL": "XRPUSDT",
+        "LEVERAGE": "10",
+    })
+    config = Config()
+    c = BinanceFuturesClient.__new__(BinanceFuturesClient)
+    c.config = config
+    c.client = MagicMock()
+    return c
+
+
 @pytest.mark.asyncio
 async def test_set_leverage(config):
     with patch("src.exchange.Client") as MockClient:
@@ -54,3 +69,47 @@ def test_calculate_quantity_zero_balance(client):
     """잔고 0이면 최소 명목금액 기반 수량 반환"""
     qty = client.calculate_quantity(balance=0.0, price=2.5, leverage=10, margin_ratio=0.50)
     assert qty > 0
+
+
+@pytest.mark.asyncio
+async def test_get_open_interest(exchange):
+    """get_open_interest()가 float을 반환하는지 확인."""
+    exchange.client.futures_open_interest = MagicMock(
+        return_value={"openInterest": "123456.789"}
+    )
+    result = await exchange.get_open_interest()
+    assert isinstance(result, float)
+    assert result == pytest.approx(123456.789)
+
+
+@pytest.mark.asyncio
+async def test_get_funding_rate(exchange):
+    """get_funding_rate()가 float을 반환하는지 확인."""
+    exchange.client.futures_mark_price = MagicMock(
+        return_value={"lastFundingRate": "0.0001"}
+    )
+    result = await exchange.get_funding_rate()
+    assert isinstance(result, float)
+    assert result == pytest.approx(0.0001)
+
+
+@pytest.mark.asyncio
+async def test_get_open_interest_error_returns_none(exchange):
+    """API 오류 시 None 반환 확인."""
+    from binance.exceptions import BinanceAPIException
+    exchange.client.futures_open_interest = MagicMock(
+        side_effect=BinanceAPIException(MagicMock(status_code=400), 400, '{"code":-1121,"msg":"Invalid symbol"}')
+    )
+    result = await exchange.get_open_interest()
+    assert result is None
+
+
+@pytest.mark.asyncio
+async def test_get_funding_rate_error_returns_none(exchange):
+    """API 오류 시 None 반환 확인."""
+    from binance.exceptions import BinanceAPIException
+    exchange.client.futures_mark_price = MagicMock(
+        side_effect=BinanceAPIException(MagicMock(status_code=400), 400, '{"code":-1121,"msg":"Invalid symbol"}')
+    )
+    result = await exchange.get_funding_rate()
+    assert result is None