Merge pull request #183 from hummingbot/feat/add_error_handling_dates

(feat) add error handling for dates

frontend/pages/data/download_candles/app.py

@@ -27,6 +27,9 @@
 if get_data_button:
     start_datetime = datetime.combine(start_date, time.min)
     end_datetime = datetime.combine(end_date, time.max)
+    if end_datetime < start_datetime:
+        st.error("End Date should be greater than Start Date.")
+        st.stop()
 
     candles = backend_api_client.get_historical_candles(
         connector=connector,

frontend/st_utils.py

@@ -74,14 +74,14 @@ def style_metric_cards(
 def get_backend_api_client():
     from backend.services.backend_api_client import BackendAPIClient
     from CONFIG import BACKEND_API_HOST, BACKEND_API_PORT
-    backend_api_client = BackendAPIClient.get_instance(host=BACKEND_API_HOST, port=BACKEND_API_PORT)
     is_docker_running = False
     try:
+        backend_api_client = BackendAPIClient.get_instance(host=BACKEND_API_HOST, port=BACKEND_API_PORT)
         is_docker_running = backend_api_client.is_docker_running()
     except Exception as e:
         st.error(
-            f"There was an error trying to connect to the Backend API: "
-            f"\n\n{str(e)} \n\nPlease make sure the Backend API is running.")
+            f"There was an error trying to connect to the Backend API. Please make sure the Backend API is running.\n\n"
+            f"Error: \n\n{str(e)}")
         st.stop()
     if not is_docker_running:
         st.error("Docker is not running. Please make sure Docker is running.")