fix: rename

src/blackbox/calculator.py

@@ -0,0 +1,38 @@
+from fastapi import status
+from fastapi.responses import JSONResponse
+from blackbox.blackbox import Blackbox
+
+
+class Calculator(Blackbox):
+    
+    """This class just for example, it show how to implement Blackbox interface."""
+    
+    def valid(self, data: any) -> bool:
+        return isinstance(data, dict) and "operation" in data and "a" in data and "b" in data
+    
+    def processing(self, data: dict) -> any:
+        if not self.valid(data):
+            raise ValueError("Invalid data")
+        a = data["a"]
+        b = data["b"]
+        op = data["operation"]
+        if op == "add":
+            return a + b
+        if op == "sub":
+            return a - b
+        if op == "mul":
+            return a * b
+        if op == "div":
+            return a / b
+        raise ValueError("Invalid operation")
+    
+    async def fast_api_handler(self, request) -> any:
+        try:
+            data = await request.json()
+        except:
+            return JSONResponse(content={"error": "json parse error"}, status_code=status.HTTP_400_BAD_REQUEST)
+        try:
+            result = self.processing(data)
+        except ValueError as e:
+            return JSONResponse(content={"error": str(e)}, status_code=status.HTTP_400_BAD_REQUEST)
+        return JSONResponse(content={"result": result}, status_code=status.HTTP_200_OK)