no connection on empty pool

Author: joente

test_thingsdb.py

@@ -10,9 +10,9 @@ async def async_test_playground(self):
 
         client = Client(ssl=True)
 
-        await client.connect('playground.thingsdb.net', 9400)
+        # await client.connect('playground.thingsdb.net', 9400)
         try:
-            await client.authenticate('Fai6NmH7QYxA6WLYPdtgcy')
+            # await client.authenticate('Fai6NmH7QYxA6WLYPdtgcy')
             data = await client.query(
                 code='.greetings[index];',
                 index=1,
@@ -26,3 +26,6 @@ async def async_test_playground(self):
     def test_playground(self):
         loop = asyncio.get_event_loop()
         loop.run_until_complete(self.async_test_playground())
+
+
+TestPlayground().test_playground()

thingsdb/client/client.py

@@ -339,6 +339,8 @@ async def _ensure_write(
             is_bin: bool = False,
             timeout: Optional[int] = None
     ) -> asyncio.Future:
+        if not self._pool:
+            raise ConnectionError('no connection')
         while True:
             if not self.is_connected():
                 logging.info('Wait for a connection')