refactor: Add error handling to TracingService methods

src/backend/base/langflow/services/tracing/service.py

@@ -55,22 +55,28 @@ class TracingService(Service):
         for tracer in self._tracers.values():
             if not tracer.ready:
                 continue
-            tracer.add_trace(trace_name, trace_type, inputs, metadata)
+            try:
+                tracer.add_trace(trace_name, trace_type, inputs, metadata)
+            except Exception as e:
+                logger.error(f"Error starting trace {trace_name}: {e}")
 
     def _end_traces(self, trace_name: str, error: str | None = None):
         for tracer in self._tracers.values():
             if not tracer.ready:
                 continue
-            tracer.end_trace(trace_name=trace_name, outputs=self.outputs, error=error)
+            try:
+                tracer.end_trace(trace_name=trace_name, outputs=self.outputs, error=error)
+            except Exception as e:
+                logger.error(f"Error ending trace {trace_name}: {e}")
 
-    def _end_all_traces(self, outputs: dict[str, Any]):
+    def _end_all_traces(self, outputs: dict[str, Any], error: str | None = None):
         for tracer in self._tracers.values():
             if not tracer.ready:
                 continue
-            tracer.end(outputs=outputs)
+            tracer.end(outputs=outputs, error=error)
 
-    def end(self, outputs: dict[str, Any] | None = None):
+    async def end(self, outputs: dict[str, Any] | None = None, error: str | None = None):
-        self._end_all_traces(outputs)
+        self._end_all_traces(outputs, error)
         self._reset_io()
 
     @contextmanager
@@ -90,8 +96,8 @@ class TracingService(Service):
             self._reset_io()
 
     def set_outputs(self, outputs: Dict[str, Any], output_metadata: Dict[str, Any] = None):
-        self.outputs = outputs
+        self.outputs |= outputs or {}
-        self.outputs_metadata = output_metadata
+        self.outputs_metadata |= output_metadata or {}
 
 
 class LangSmithTracer:
@@ -129,37 +135,46 @@ class LangSmithTracer:
     def add_trace(self, trace_name: str, trace_type: str, inputs: Dict[str, Any], metadata: Dict[str, Any] = None):
         if not self._ready:
             return
-        inputs = self._convert_to_langchain_types(inputs)
+        raw_inputs = {}
+        processed_inputs = {}
+        if inputs:
+            raw_inputs = inputs.copy()
+            raw_inputs |= metadata or {}
+            processed_inputs = self._convert_to_langchain_types(inputs)
         child = self._run_tree.create_child(
             name=trace_name,
             run_type=trace_type,
-            inputs=inputs,
+            inputs=processed_inputs,
         )
         if metadata:
-            child.add_metadata(metadata)
+            child.add_metadata(raw_inputs)
         self._children[trace_name] = child
 
     def _convert_to_langchain_types(self, io_dict: Dict[str, Any]):
+        converted = {}
+        for key, value in io_dict.items():
+            converted[key] = self._convert_to_langchain_type(value)
+        return converted
+
+    def _convert_to_langchain_type(self, value):
         from langflow.schema.message import Message
 
-        _converted = {}
+        if isinstance(value, dict):
-        for key, value in io_dict.items():
+            for key, _value in value.copy().items():
-            if isinstance(value, dict):
+                _value = self._convert_to_langchain_type(_value)
-                _converted[key] = self._convert_to_langchain_types(value)
+                value[key] = _value
-            elif isinstance(value, list):
+        elif isinstance(value, list):
-                _converted[key] = [self._convert_to_langchain_types(v) for v in value]
+            value = [self._convert_to_langchain_type(v) for v in value]
-            elif isinstance(value, Message):
+        elif isinstance(value, Message):
-                if value.sender:
+            if "prompt" in value:
-                    _converted[key] = value.to_lc_message()
+                value = value.load_lc_prompt()
-                elif "prompt" in value:
+            elif value.sender:
-                    _converted[key] = value.load_lc_prompt()
+                value = value.to_lc_message()
-                else:
-                    _converted[key] = value.to_lc_document()
-            elif isinstance(value, Data):
-                _converted[key] = value.to_lc_document()
             else:
-                _converted[key] = value
+                value = value.to_lc_document()
-        return _converted
+        elif isinstance(value, Data):
+            value = value.to_lc_document()
+        return value
 
     def end_trace(self, trace_name: str, outputs: Dict[str, Any] = None, error: str = None):
         child = self._children[trace_name]
@@ -175,8 +190,8 @@ class LangSmithTracer:
         else:
             child.post()
 
-    def end(self, outputs: Dict[str, Any]):
+    def end(self, outputs: Dict[str, Any], error: str | None = None):
-        self._run_tree.end(outputs=outputs)
+        self._run_tree.end(outputs=outputs, error=error)
         self._run_tree.post()
         wait_for_all_tracers()
         self._run_link = self._run_tree.get_url()