Generate AES KeyPair lazily (#687)

* Generate AES KeyPair lazily

* Fix coverage

* Update post-review

* Fix pragma

* Make json dumps consistent between python and orjson

* Add comment

* Add comments re json parameter in HttpClient

kasa/httpclient.py

@@ -41,14 +41,25 @@ class HttpClient:
         *,
         params: Optional[Dict[str, Any]] = None,
         data: Optional[bytes] = None,
-        json: Optional[Dict] = None,
+        json: Optional[Union[Dict, Any]] = None,
         headers: Optional[Dict[str, str]] = None,
         cookies_dict: Optional[Dict[str, str]] = None,
     ) -> Tuple[int, Optional[Union[Dict, bytes]]]:
-        """Send an http post request to the device."""
+        """Send an http post request to the device.
+
+        If the request is provided via the json parameter json will be returned.
+        """
         response_data = None
         self._last_url = url
         self.client.cookie_jar.clear()
+        return_json = bool(json)
+        # If json is not a dict send as data.
+        # This allows the json parameter to be used to pass other
+        # types of data such as async_generator and still have json
+        # returned.
+        if json and not isinstance(json, Dict):
+            data = json
+            json = None
         try:
             resp = await self.client.post(
                 url,
@@ -62,7 +73,7 @@ class HttpClient:
             async with resp:
                 if resp.status == 200:
                     response_data = await resp.read()
-                    if json:
+                    if return_json:
                         response_data = json_loads(response_data.decode())
 
         except (aiohttp.ServerDisconnectedError, aiohttp.ClientOSError) as ex: