OpenAIChatAtomicFlow.py

from copy import deepcopy
import hydra

import time

from typing import Dict, Optional, Any

from flows.base_flows import AtomicFlow

from flows.utils import logging
from flows.messages.flow_message import UpdateMessage_ChatMessage

from flows.prompt_template import JinjaPrompt

from flows.backends.llm_lite import LiteLLMBackend

log = logging.get_logger(__name__)


class OpenAIChatAtomicFlow(AtomicFlow):
    REQUIRED_KEYS_CONFIG = ["backend"]

    SUPPORTS_CACHING: bool = True

    system_message_prompt_template: JinjaPrompt
    human_message_prompt_template: JinjaPrompt

    backend: LiteLLMBackend
    init_human_message_prompt_template: Optional[JinjaPrompt] = None

    def __init__(self,
                 system_message_prompt_template,
                 human_message_prompt_template,
                 init_human_message_prompt_template,
                 backend,
                 **kwargs):
        super().__init__(**kwargs)
        self.system_message_prompt_template = system_message_prompt_template
        self.human_message_prompt_template = human_message_prompt_template
        self.init_human_message_prompt_template = init_human_message_prompt_template
        self.backend = backend
        assert self.flow_config["name"] not in [
            "system",
            "user",
            "assistant",
        ], f"Flow name '{self.flow_config['name']}' cannot be 'system', 'user' or 'assistant'"

    def set_up_flow_state(self):
        super().set_up_flow_state()
        self.flow_state["previous_messages"] = []

    @classmethod
    def _set_up_prompts(cls, config):
        kwargs = {}
        
        kwargs["system_message_prompt_template"] = \
            hydra.utils.instantiate(config['system_message_prompt_template'], _convert_="partial")
        kwargs["init_human_message_prompt_template"] = \
            hydra.utils.instantiate(config['init_human_message_prompt_template'], _convert_="partial")
        kwargs["human_message_prompt_template"] = \
            hydra.utils.instantiate(config['human_message_prompt_template'], _convert_="partial")

        return kwargs
    
    @classmethod
    def _set_up_backend(cls, config):
        kwargs = {}

        kwargs["backend"] = \
            hydra.utils.instantiate(config['backend'], _convert_="partial")
        
        return kwargs

    @classmethod
    def instantiate_from_config(cls, config):
        flow_config = deepcopy(config)

        kwargs = {"flow_config": flow_config}

        # ~~~ Set up prompts ~~~
        kwargs.update(cls._set_up_prompts(flow_config))
        kwargs.update(cls._set_up_backend(flow_config))

        # ~~~ Instantiate flow ~~~
        return cls(**kwargs)

    def _is_conversation_initialized(self):
        if len(self.flow_state["previous_messages"]) > 0:
            return True

        return False

    def get_interface_description(self):
        if self._is_conversation_initialized():

            return {"input": self.flow_config["input_interface_initialized"],
                    "output": self.flow_config["output_interface"]}
        else:
            return {"input": self.flow_config["input_interface_non_initialized"],
                    "output": self.flow_config["output_interface"]}

    @staticmethod
    def _get_message(prompt_template, input_data: Dict[str, Any]):
        template_kwargs = {}
        for input_variable in prompt_template.input_variables:
            template_kwargs[input_variable] = input_data[input_variable]
        msg_content = prompt_template.format(**template_kwargs)
        return msg_content

    def _get_demonstration_query_message_content(self, sample_data: Dict):
        input_variables = self.init_human_message_prompt_template.input_variables
        return self.init_human_message_prompt_template.format(**{k: sample_data[k] for k in input_variables})


    def _add_demonstrations(self, input_data: Dict[str, Any]):
        
        for demonstration in input_data.get("demonstrations",[]):
            query = demonstration["query"]
            response = demonstration["response"]
            
            self._state_update_add_chat_message(content=query,
                                                role=self.flow_config["user_name"])

            self._state_update_add_chat_message(content=response,
                                                role=self.flow_config["assistant_name"])

    def _state_update_add_chat_message(self,
                                       role: str,
                                       content: str) -> None:


        acceptable_roles = [self.flow_config["system_name"],self.flow_config["user_name"],self.flow_config["assistant_name"]]
        if role in acceptable_roles:
            self.flow_state["previous_messages"].append({"role": role , "content": content})
            
        else:
            raise Exception(f"Invalid role: `{role}`.\n"
                            f"Role should be one of: "
                            f"`{acceptable_roles}`, ")
      

        # Log the update to the flow messages list
        chat_message = UpdateMessage_ChatMessage(
            created_by=self.flow_config["name"],
            updated_flow=self.flow_config["name"],
            role=role,
            content=content,
        )
        self._log_message(chat_message)

    def _get_previous_messages(self):
        all_messages = self.flow_state["previous_messages"]
        first_k = self.flow_config["previous_messages"]["first_k"]
        last_k = self.flow_config["previous_messages"]["last_k"]

        if not first_k and not last_k:
            return all_messages
        elif first_k and last_k:
            return all_messages[:first_k] + all_messages[-last_k:]
        elif first_k:
            return all_messages[:first_k]
        return all_messages[-last_k:]

    def _call(self):
         
        messages = self._get_previous_messages()
        _success = False
        attempts = 1
        error = None
        response = None
        while attempts <= self.flow_config['n_api_retries']:
            try:
                response = self.backend(messages=messages,mock_response=False) #set mock_response to True when debugging (fake API request)
                response = [ answer["content"] for answer in response] # because n in the generation parameters can be > 1
                _success = True
                break
            except Exception as e:
                log.error(
                    f"Error {attempts} in calling backend: {e}. "
                    f"Retrying in {self.flow_config['wait_time_between_retries']} seconds..."
                )
                # log.error(
                #     f"The API call raised an exception with the following arguments: "
                #     f"\n{self.flow_state['history'].to_string()}"
                # ) # ToDo: Make this message more user-friendly
                attempts += 1
                time.sleep(self.flow_config['wait_time_between_retries'])
                error = e
        
        if not _success:
            raise error

        return response

    def _initialize_conversation(self, input_data: Dict[str, Any]):
        # ~~~ Add the system message ~~~
        system_message_content = self._get_message(self.system_message_prompt_template, input_data)

        self._state_update_add_chat_message(content=system_message_content,
                                            role=self.flow_config["system_name"])

        # # ~~~ Add the demonstration  (if any) ~~~
        self._add_demonstrations(input_data)

    def _process_input(self, input_data: Dict[str, Any]):
        if self._is_conversation_initialized():
            # Construct the message using the human message prompt template
            user_message_content = self._get_message(self.human_message_prompt_template, input_data)

        else:
            # Initialize the conversation (add the system message, and potentially the demonstrations)
            self._initialize_conversation(input_data)
            if getattr(self, "init_human_message_prompt_template", None) is not None:
                # Construct the message using the query message prompt template
                user_message_content = self._get_message(self.init_human_message_prompt_template, input_data)
            else:
                user_message_content = self._get_message(self.human_message_prompt_template, input_data)

        self._state_update_add_chat_message(role=self.flow_config["user_name"],
                                            content=user_message_content)

    def run(self,
            input_data: Dict[str, Any]) -> Dict[str, Any]:
        # ~~~ Process input ~~~
        self._process_input(input_data)

        # ~~~ Call ~~~
        response = self._call()
        
        #loop is in case there was more than one answer (n>1 in generation parameters)
        for answer in response:
            self._state_update_add_chat_message(
                role=self.flow_config["assistant_name"],
                content=answer
            )
        response = response if len(response) > 1 or len(response) == 0 else response[0]
        return {"api_output": response}