Add debug log about error in handling actions

Author: FelonEkonom

lib/membrane/core/callback_handler.ex

@@ -185,6 +185,8 @@ defmodule Membrane.Core.CallbackHandler do
           Error handling actions returned by callback #{inspect(state.module)}.#{callback}
           """)
 
+          log_debug_orginal_error(actions, e, __STACKTRACE__)
+
           reraise e, __STACKTRACE__
       end
 
@@ -198,10 +200,26 @@ defmodule Membrane.Core.CallbackHandler do
             Error handling action #{inspect(action)} returned by callback #{inspect(state.module)}.#{callback}
             """)
 
+            log_debug_orginal_error(action, e, __STACKTRACE__)
+
             reraise e, __STACKTRACE__
         end
       end)
 
     handler_module.handle_end_of_actions(state)
   end
+
+  defp log_debug_orginal_error(action_or_actions, error, stacktrace) do
+    action_or_actions =
+      if(is_list(action_or_actions), do: "actions ", else: "action ") <>
+        inspect(action_or_actions, limit: :infinity)
+
+    Membrane.Logger.debug("""
+    Error while handling #{action_or_actions}
+
+    Orginal error:
+    #{inspect(error, pretty: true, limit: :infinity)}
+    #{Exception.format_stacktrace(stacktrace)}
+    """)
+  end
 end

test/membrane/integration/links_validation_test.exs

@@ -74,7 +74,7 @@ defmodule Membrane.LinksValidationTest do
       ]
 
       {:error, {{%Membrane.LinkError{}, _stackstrace}, _meta}} =
-        Pipeline.start_supervised(spec: spec)
+        Pipeline.start_supervised(spec: [spec, spec])
     end
 
     test "dynamic pads" do