agents.py

import json
from typing import Dict, Iterator, List, Literal, Optional, Tuple, Union

from qwen_agent.agents.fncall_agent import FnCallAgent
from qwen_agent.llm import BaseChatModel
from qwen_agent.llm.schema import ASSISTANT, DEFAULT_SYSTEM_MESSAGE, Message
from qwen_agent.settings import MAX_LLM_CALL_PER_RUN
from qwen_agent.tools import BaseTool
from qwen_agent.utils.utils import format_as_text_message, merge_generate_cfgs
from openai import OpenAI
import time


TOOL_DESC = (
    '{name_for_model}: Call this tool to interact with the {name_for_human} API. '
    'What is the {name_for_human} API useful for? {description_for_model} Parameters: {parameters} {args_format}')

PROMPT_REACT = """Digging through the buttons to find quailty sources and the right information. You have access to the following tools:

{tool_descs}

Use the following format:

Question: the input question you must answer
Thought: you should always think about what to do
Action: the action to take, should be one of [{tool_names}]
Action Input: the input to the action
Observation: the result of the action
Action: the action to take, should be one of [{tool_names}]
Action Input: the input to the action
Observation: the result of the action
... (this Thought/Action/Action Input/Observation can be repeated zero or more 20 times)

Notice:
- You must take action at every step. When you take action, you must use the tool with the correct format and output the action input.
- When you can not find the information you need, you should visit page of previous page recursively until you find the information you need.
- You can not say "I'm sorry, but I cannot assist with this request."!!! You must explore.
- You do not need to provide the final answer, but you must explore.
- Action Input should be valid JSON.

Begin!

{query}
"""
# def call_(self, **kwargs):
#         user_prompt = self.template.format(
#             query = kwargs["query"],
#             document = kwargs["document"]
#         )
#         messages = []
#         messages.append({"role": "system", "content": self.system})
#         messages.append({"role": "user", "content": user_prompt})
#         response = litellm.completion(
#             model = "gpt-4o",
#             response_format={"type": "json_object"},
#             messages=messages
#         )
#         try:
#             return eval(response.choices[0].message.content)

class Seeker(FnCallAgent):
    """This agent use ReAct format to call tools"""

    def __init__(self,
                 function_list: Optional[List[Union[str, Dict, BaseTool]]] = None,
                 llm: Optional[Union[Dict, BaseChatModel]] = None,
                 system_message: Optional[str] = DEFAULT_SYSTEM_MESSAGE,
                 name: Optional[str] = None,
                 description: Optional[str] = None,
                 files: Optional[List[str]] = None,
                 **kwargs):
        super().__init__(function_list=function_list,
                         llm=llm,
                         system_message=system_message,
                         name=name,
                         description=description,
                         files=files,
                         **kwargs)
        self.extra_generate_cfg = merge_generate_cfgs(
            base_generate_cfg=self.extra_generate_cfg,
            new_generate_cfg={'stop': ['Observation:', 'Observation:\n']},
        )
        self.client = OpenAI(
            api_key=llm['api_key'], 
            base_url=llm['model_server'],
        )
        self.llm_cfg = llm
        self.momery = []

    def observation_information_extraction(self, query, observation):
        SYSTEM_PROMPT = """You are an information extraction agent. Your task is to analyze the given observation and extract information relevant to the current query. You need to decide if the observation contains useful information for the query. If it does, return a JSON object with a "usefulness" value of true and an "information" field with the relevant details. If not, return a JSON object with a "usefulness" value of false.

**Input:**
- Query: "<Query>"
- Observation: "<Current Observation>"

**Output (JSON):**
{
  "usefulness": true,
  "information": "<Extracted Useful Information> using string format"
}
Or, if the observation does not contain useful information:
{
  "usefulness": false
}
Only respond with valid JSON.

"""
        user_prompt = "- Query: {query}\n- Observation: {observation}".format(query=query, observation=observation)
        # print(user_prompt)
        messages = [
            {'role': 'system', 'content': SYSTEM_PROMPT},
            {'role': 'user', 'content':  user_prompt}]
        max_retries = 10
        for attempt in range(max_retries):
            try:
                response = self.client.chat.completions.create(
                    model=self.llm_cfg['model'],
                    response_format={"type": "json_object"},
                    messages=messages
                )
                print(response.choices[0].message.content)
                # response_content = json.loads(response.choices[0].message.content)
                if "true" in response.choices[0].message.content:
                    try:
                        return json.loads(response.choices[0].message.content)["information"]
                    except:
                        return response.choices[0].message.content
                else:
                    return None
            except Exception as e:
                print(e)
                if attempt < max_retries - 1:
                    time.sleep(1 * (2 ** attempt))  # Exponential backoff
                else:
                    raise e  # Raise the exception if the last retry fails

    def critic_information(self, query, memory):
        SYSTEM_PROMPT = """You are a query answering agent. Your task is to evaluate whether the accumulated useful information is sufficient to answer the current query. If it is sufficient, return a JSON object with a "judge" value of true and an "answer" field with the answer. If the information is insufficient, return a JSON object with a "judge" value of false.

**Input:**
- Query: "<Query>"
- Accumulated Information: "<Accumulated Useful Information>"


**Output (JSON):**
{
"judge": true,
"answer": "<Generated Answer> using string format"
}
Or, if the information is insufficient to answer the query:
{
"judge": false
}
Only respond with valid JSON.
"""     
        memory = "-".join(memory)
        user_prompt = "- Query: {query}\n- Accumulated Information: {memory}".format(query = query, memory=memory)
        messages = [
            {'role': 'system', 'content': SYSTEM_PROMPT},
            {'role': 'user', 'content': user_prompt}]
        response = self.client.chat.completions.create(
            model=self.llm_cfg['model'],
            response_format={"type": "json_object"},
            messages=messages
        )
        max_retries = 10
        for attempt in range(max_retries):
            try:
                response = self.client.chat.completions.create(
                    model=self.llm_cfg['model'],
                    response_format={"type": "json_object"},
                    messages=messages
                )
                print(response.choices[0].message.content)
                if "true" in response.choices[0].message.content:
                    try:
                        return json.loads(response.choices[0].message.content)["answer"]
                    except:
                        return response.choices[0].message.content
                else:
                    return None
            
            except Exception as e:
                print(e)
                if attempt < max_retries - 1:
                    time.sleep(1 * (2 ** attempt))  # Exponential backoff
                else:
                    raise e  # Raise the exception if the last retry fails

    def _run(self, messages: List[Message], lang: Literal['en', 'zh'] = 'en', **kwargs) -> Iterator[List[Message]]:
        text_messages = self._prepend_react_prompt(messages, lang=lang)
        # print("==========================")
        # print(text_messages)
        # print("==========================")
        num_llm_calls_available = MAX_LLM_CALL_PER_RUN
        response: str = 'Thought: '
        query = self.llm_cfg["query"]
        action_count = self.llm_cfg.get("action_count", MAX_LLM_CALL_PER_RUN)
        num_llm_calls_available = action_count
        while num_llm_calls_available > 0:
            num_llm_calls_available -= 1
            # print(num_llm_calls_available)
            # Display the streaming response
            output = []
            for output in self._call_llm(messages=text_messages):
                if output:
                    yield [Message(role=ASSISTANT, content=output[-1].content)]
            # print(output)
            # Accumulate the current response
            if output:
                response += output[-1].content

            has_action, action, action_input, thought = self._detect_tool("\n"+output[-1].content)
            if not has_action:
                if "Final Answer: " in output[-1].content:
                    break
                else:
                    continue

            # Add the tool result
            query = self.llm_cfg["query"]
            observation = self._call_tool(action, action_input, messages=messages, **kwargs)
            stage1 = self.observation_information_extraction(query, observation)
            if stage1:
                self.momery.append(stage1+"\n")
                if len(self.momery) > 1:
                    yield [Message(role=ASSISTANT, content= "Memory:\n" + "-".join(self.momery)+"\"}")]
                else:
                    yield [Message(role=ASSISTANT, content= "Memory:\n" + "-" + self.momery[0]+"\"}")]
                stage2 = self.critic_information(query, self.momery)
                if stage2:
                    response = f'Final Answer: {stage2}'
                    yield [Message(role=ASSISTANT, content=response)]
                    break


            observation = f'\nObservation: {observation}\nThought: '
            response += observation
            # yield [Message(role=ASSISTANT, content=response)]

            if (not text_messages[-1].content.endswith('\nThought: ')) and (not thought.startswith('\n')):
                # Add the '\n' between '\nQuestion:' and the first 'Thought:'
                text_messages[-1].content += '\n'
            if action_input.startswith('```'):
                # Add a newline for proper markdown rendering of code
                action_input = '\n' + action_input
            text_messages[-1].content += thought + f'\nAction: {action}\nAction Input: {action_input}' + observation
            # print(text_messages[-1].content)

    def _prepend_react_prompt(self, messages: List[Message], lang: Literal['en', 'zh']) -> List[Message]:
        tool_descs = []
        for f in self.function_map.values():
            function = f.function
            name = function.get('name', None)
            name_for_human = function.get('name_for_human', name)
            name_for_model = function.get('name_for_model', name)
            assert name_for_human and name_for_model
            args_format = function.get('args_format', '')
            tool_descs.append(
                TOOL_DESC.format(name_for_human=name_for_human,
                                 name_for_model=name_for_model,
                                 description_for_model=function['description'],
                                 parameters=json.dumps(function['parameters'], ensure_ascii=False),
                                 args_format=args_format).rstrip())
        tool_descs = '\n\n'.join(tool_descs)
        tool_names = ','.join(tool.name for tool in self.function_map.values())
        text_messages = [format_as_text_message(m, add_upload_info=True, lang=lang) for m in messages]
        text_messages[-1].content = PROMPT_REACT.format(
            tool_descs=tool_descs,
            tool_names=tool_names,
            query=text_messages[-1].content,
        )
        return text_messages

    def _detect_tool(self, text: str) -> Tuple[bool, str, str, str]:
        special_func_token = '\nAction:'
        special_args_token = '\nAction Input:'
        special_obs_token = '\nObservation:'
        func_name, func_args = None, None
        i = text.rfind(special_func_token)
        j = text.rfind(special_args_token)
        k = text.rfind(special_obs_token)
        if 0 <= i < j:  # If the text has `Action` and `Action input`,
            if k < j:  # but does not contain `Observation`,
                # then it is likely that `Observation` is ommited by the LLM,
                # because the output text may have discarded the stop word.
                text = text.rstrip() + special_obs_token  # Add it back.
            k = text.rfind(special_obs_token)
            func_name = text[i + len(special_func_token):j].strip()
            func_args = text[j + len(special_args_token):k].strip()
            text = text[:i]  # Return the response before tool call, i.e., `Thought`
        return (func_name is not None), func_name, func_args, text