fix llamaindex CompletionResponse serialize error

[nightosong]

While I use langfuse with llamaindex, I get an error output:

received error response: {'message': 'Invalid request data', 'errors': ['Expected object, received string']}
Received 400 error by Langfuse server, not retrying: {'message': 'Invalid request data', 'errors': ['Expected object, received string']}

Then I debug the task_manager file and find this code data = json.dumps(kwargs, cls=EventSerializer) . In my case, the output object in body is type of <class 'llama_index.core.base.llms.types.CompletionResponse'>. When it executes this line of default() in EventSerializer, a TypeError will be thrown. TypeError: 'MockValSer' object cannot be converted to 'SchemaSerializer' (pydantic 2.8.2)

if isinstance(obj, BaseModel):
    return obj.dict()

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I just realized that this issue is caused by the type from llamaindex. Would there be any risks if I handle all of the CompletionResponse here?

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