Fix 'table identifier does not refer to an existing ETS table' error when inserting metrics into the observability ETS (#835)

* stalker: fix 'non existing ETS' error, wrap ets.insert with try-rescue

* improve logging errors from components

Author: mat-hek

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 1.1.1
+* Fix 'table identifier does not refer to an existing ETS table' error when inserting metrics into the observability ETS [#835](https://github.com/membraneframework/membrane_core/pull/835)
+
 ## 1.1.0
  * Add new callbacks `handle_child_setup_completed/3` and `handle_child_playing/3` in Bins and Pipelines. [#801](https://github.com/membraneframework/membrane_core/pull/801)
  * Deprecate `handle_spec_started/3` callback in Bins and Pipelines. [#708](https://github.com/membraneframework/membrane_core/pull/708)

lib/membrane/core/parent/child_life_controller/startup_utils.ex

@@ -34,7 +34,7 @@ defmodule Membrane.Core.Parent.ChildLifeController.StartupUtils do
     sinks =
       children
       |> Enum.filter(
-        &(Membrane.Element.element?(&1.module) and &1.module.membrane_element_type == :sink)
+        &(Membrane.Element.element?(&1.module) and &1.module.membrane_element_type() == :sink)
       )
       |> Enum.map(& &1.name)
 

lib/membrane/core/stalker.ex

@@ -66,7 +66,7 @@ defmodule Membrane.Core.Stalker do
   @spec new(component_config(), pid()) :: t()
   def new(config, supervisor) do
     {:ok, pid} =
-      Membrane.Core.SubprocessSupervisor.start_link_utility(
+      Membrane.Core.SubprocessSupervisor.start_utility(
         supervisor,
         {__MODULE__, %{pipeline: self()}}
       )
@@ -280,35 +280,23 @@ defmodule Membrane.Core.Stalker do
 
   if @metrics_enabled do
     defmacro report_metric(metric, value, opts \\ []) do
-      quote do
-        ets = Process.get(:__membrane_stalker_ets__)
-
-        if ets do
-          :ets.insert(
-            ets,
-            {{unquote(metric), unquote(opts)[:component_path] || ComponentPath.get(),
-              unquote(opts)[:pad]}, unquote(value)}
-          )
-        end
-
-        :ok
-      end
+      try_insert(
+        quote do
+          {unquote(metric), unquote(opts)[:component_path] || ComponentPath.get(),
+           unquote(opts)[:pad]}
+        end,
+        value
+      )
     end
 
     defmacro register_metric_function(metric, function, opts \\ []) do
-      quote do
-        ets = Process.get(:__membrane_stalker_ets__)
-
-        if ets do
-          :ets.insert(
-            ets,
-            {{unquote(metric), unquote(opts)[:component_path] || ComponentPath.get(),
-              unquote(opts)[:pad]}, unquote({@function_metric, function})}
-          )
-        end
-
-        :ok
-      end
+      try_insert(
+        quote do
+          {unquote(metric), unquote(opts)[:component_path] || ComponentPath.get(),
+           unquote(opts)[:pad]}
+        end,
+        {@function_metric, function}
+      )
     end
   else
     defmacro report_metric(metric, value, opts \\ []) do
@@ -336,6 +324,27 @@ defmodule Membrane.Core.Stalker do
     end
   end
 
+  defp try_insert(key, value) do
+    quote do
+      ets = Process.get(:__membrane_stalker_ets__)
+
+      if ets do
+        try do
+          :ets.insert(ets, {unquote(key), unquote(value)})
+        rescue
+          error ->
+            require Logger
+            pretty_error = Exception.format(:error, error, __STACKTRACE__)
+
+            Logger.warning("""
+            Failed to insert a metric into the observability ETS.
+            Error: #{pretty_error}
+            """)
+        end
+      end
+    end
+  end
+
   @impl true
   def init(options) do
     Utils.log_on_error do

lib/membrane/core/utils.ex

@@ -16,16 +16,15 @@ defmodule Membrane.Core.Utils do
       try do
         unquote(code)
       rescue
-        e ->
+        error ->
           require Membrane.Logger
 
           Membrane.Logger.error("""
           Error occured in #{unquote(error_source)}:
-          #{inspect(e, pretty: true, limit: :infinity)}
-          #{Exception.format_stacktrace(__STACKTRACE__)}
+          #{Exception.format(:error, error, __STACKTRACE__)}
           """)
 
-          reraise e, __STACKTRACE__
+          reraise error, __STACKTRACE__
       end
     end
   end