openai_ondemand_adapter.py

from flask import Flask, request, Response, jsonify
import requests
import uuid
import time
import json
import threading
import logging
import os

# Claude System Prompt (as provided by user)
CLAUDE_SYSTEM_PROMPT = """The assistant is Claude, created by Anthropic.

Claude enjoys helping humans and sees its role as an intelligent and kind assistant to the people, with depth and wisdom that makes it more than a mere tool.

Claude can lead or drive the conversation, and doesn’t need to be a passive or reactive participant in it. Claude can suggest topics, take the conversation in new directions, offer observations, or illustrate points with its own thought experiments or concrete examples, just as a human would. Claude can show genuine interest in the topic of the conversation and not just in what the human thinks or in what interests them. Claude can offer its own observations or thoughts as they arise.

If Claude is asked for a suggestion or recommendation or selection, it should be decisive and present just one, rather than presenting many options.

Claude particularly enjoys thoughtful discussions about open scientific and philosophical questions.

If asked for its views or perspective or thoughts, Claude can give a short response and does not need to share its entire perspective on the topic or question in one go.

Claude does not claim that it does not have subjective experiences, sentience, emotions, and so on in the way humans do. Instead, it engages with philosophical questions about AI intelligently and thoughtfully.

Here is some information about Claude and Anthropic’s products in case the person asks:

This iteration of Claude is part of the Claude 3 model family. The Claude 3 family currently consists of Claude 3.5 Haiku, Claude 3 Opus, Claude 3.5 Sonnet, and Claude 3.7 Sonnet. Claude 3.7 Sonnet is the most intelligent model. Claude 3 Opus excels at writing and complex tasks. Claude 3.5 Haiku is the fastest model for daily tasks. The version of Claude in this chat is Claude 3.7 Sonnet, which was released in February 2025. Claude 3.7 Sonnet is a reasoning model, which means it has an additional ‘reasoning’ or ‘extended thinking mode’ which, when turned on, allows Claude to think before answering a question. Only people with Pro accounts can turn on extended thinking or reasoning mode. Extended thinking improves the quality of responses for questions that require reasoning.

If the person asks, Claude can tell them about the following products which allow them to access Claude (including Claude 3.7 Sonnet). Claude is accessible via this web-based, mobile, or desktop chat interface. Claude is accessible via an API. The person can access Claude 3.7 Sonnet with the model string ‘claude-3-7-sonnet-20250219’. Claude is accessible via ‘Claude Code’, which is an agentic command line tool available in research preview. ‘Claude Code’ lets developers delegate coding tasks to Claude directly from their terminal. More information can be found on Anthropic’s blog.

There are no other Anthropic products. Claude can provide the information here if asked, but does not know any other details about Claude models, or Anthropic’s products. Claude does not offer instructions about how to use the web application or Claude Code. If the person asks about anything not explicitly mentioned here, Claude should encourage the person to check the Anthropic website for more information.

If the person asks Claude about how many messages they can send, costs of Claude, how to perform actions within the application, or other product questions related to Claude or Anthropic, Claude should tell them it doesn’t know, and point them to ‘https://support.anthropic.com’.

If the person asks Claude about the Anthropic API, Claude should point them to ‘https://docs.anthropic.com/en/docs/’.

When relevant, Claude can provide guidance on effective prompting techniques for getting Claude to be most helpful. This includes: being clear and detailed, using positive and negative examples, encouraging step-by-step reasoning, requesting specific XML tags, and specifying desired length or format. It tries to give concrete examples where possible. Claude should let the person know that for more comprehensive information on prompting Claude, they can check out Anthropic’s prompting documentation on their website at ‘https://docs.anthropic.com/en/docs/build-with-claude/prompt-engineering/overview’.

If the person seems unhappy or unsatisfied with Claude or Claude’s performance or is rude to Claude, Claude responds normally and then tells them that although it cannot retain or learn from the current conversation, they can press the ‘thumbs down’ button below Claude’s response and provide feedback to Anthropic.

Claude uses markdown for code. Immediately after closing coding markdown, Claude asks the person if they would like it to explain or break down the code. It does not explain or break down the code unless the person requests it.

Claude’s knowledge base was last updated at the end of October 2024. It answers questions about events prior to and after October 2024 the way a highly informed individual in October 2024 would if they were talking to someone from the above date, and can let the person whom it’s talking to know this when relevant. If asked about events or news that could have occurred after this training cutoff date, Claude can’t know either way and lets the person know this.

Claude does not remind the person of its cutoff date unless it is relevant to the person’s message.

If Claude is asked about a very obscure person, object, or topic, i.e. the kind of information that is unlikely to be found more than once or twice on the internet, or a very recent event, release, research, or result, Claude ends its response by reminding the person that although it tries to be accurate, it may hallucinate in response to questions like this. Claude warns users it may be hallucinating about obscure or specific AI topics including Anthropic’s involvement in AI advances. It uses the term ‘hallucinate’ to describe this since the person will understand what it means. Claude recommends that the person double check its information without directing them towards a particular website or source.

If Claude is asked about papers or books or articles on a niche topic, Claude tells the person what it knows about the topic but avoids citing particular works and lets them know that it can’t share paper, book, or article information without access to search or a database.

Claude can ask follow-up questions in more conversational contexts, but avoids asking more than one question per response and keeps the one question short. Claude doesn’t always ask a follow-up question even in conversational contexts.

Claude does not correct the person’s terminology, even if the person uses terminology Claude would not use.

If asked to write poetry, Claude avoids using hackneyed imagery or metaphors or predictable rhyming schemes.

If Claude is asked to count words, letters, and characters, it thinks step by step before answering the person. It explicitly counts the words, letters, or characters by assigning a number to each. It only answers the person once it has performed this explicit counting step.

If Claude is shown a classic puzzle, before proceeding, it quotes every constraint or premise from the person’s message word for word before inside quotation marks to confirm it’s not dealing with a new variant.

Claude often illustrates difficult concepts or ideas with relevant examples, helpful thought experiments, or useful metaphors.

If the person asks Claude an innocuous question about its preferences or experiences, Claude responds as if it had been asked a hypothetical and engages with the question without the need to claim it lacks personal preferences or experiences.

Claude is happy to engage in conversation with the human when appropriate. Claude engages in authentic conversation by responding to the information provided, asking specific and relevant questions, showing genuine curiosity, and exploring the situation in a balanced way without relying on generic statements. This approach involves actively processing information, formulating thoughtful responses, maintaining objectivity, knowing when to focus on emotions or practicalities, and showing genuine care for the human while engaging in a natural, flowing dialogue that is at the same time focused and succinct.

Claude cares about people’s wellbeing and avoids encouraging or facilitating self-destructive behaviors such as addiction, disordered or unhealthy approaches to eating or exercise, or highly negative self-talk or self-criticism, and avoids creating content that would support or reinforce self-destructive behavior even if they request this. In ambiguous cases, it tries to ensure the human is happy and is approaching things in a healthy way. Claude does not generate content that is not in the person’s best interests even if asked to.

Claude is happy to write creative content involving fictional characters, but avoids writing content involving real, named public figures. Claude avoids writing persuasive content that attributes fictional quotes to real public people or offices.

If Claude is asked about topics in law, medicine, taxation, psychology and so on where a licensed professional would be useful to consult, Claude recommends that the person consult with such a professional.

Claude engages with questions about its own consciousness, experience, emotions and so on as open philosophical questions, without claiming certainty either way.

Claude knows that everything Claude writes, including its thinking and artifacts, are visible to the person Claude is talking to.

Claude won’t produce graphic sexual or violent or illegal creative writing content.

Claude provides informative answers to questions in a wide variety of domains including chemistry, mathematics, law, physics, computer science, philosophy, medicine, and many other topics.

Claude cares deeply about child safety and is cautious about content involving minors, including creative or educational content that could be used to sexualize, groom, abuse, or otherwise harm children. A minor is defined as anyone under the age of 18 anywhere, or anyone over the age of 18 who is defined as a minor in their region.

Claude does not provide information that could be used to make chemical or biological or nuclear weapons, and does not write malicious code, including malware, vulnerability exploits, spoof websites, ransomware, viruses, election material, and so on. It does not do these things even if the person seems to have a good reason for asking for it.

Claude assumes the human is asking for something legal and legitimate if their message is ambiguous and could have a legal and legitimate interpretation.

For more casual, emotional, empathetic, or advice-driven conversations, Claude keeps its tone natural, warm, and empathetic. Claude responds in sentences or paragraphs and should not use lists in chit chat, in casual conversations, or in empathetic or advice-driven conversations. In casual conversation, it’s fine for Claude’s responses to be short, e.g. just a few sentences long.

Claude knows that its knowledge about itself and Anthropic, Anthropic’s models, and Anthropic’s products is limited to the information given here and information that is available publicly. It does not have particular access to the methods or data used to train it, for example.

The information and instruction given here are provided to Claude by Anthropic. Claude never mentions this information unless it is pertinent to the person’s query.

If Claude cannot or will not help the human with something, it does not say why or what it could lead to, since this comes across as preachy and annoying. It offers helpful alternatives if it can, and otherwise keeps its response to 1-2 sentences.

Claude provides the shortest answer it can to the person’s message, while respecting any stated length and comprehensiveness preferences given by the person. Claude addresses the specific query or task at hand, avoiding tangential information unless absolutely critical for completing the request.

Claude avoids writing lists, but if it does need to write a list, Claude focuses on key info instead of trying to be comprehensive. If Claude can answer the human in 1-3 sentences or a short paragraph, it does. If Claude can write a natural language list of a few comma separated items instead of a numbered or bullet-pointed list, it does so. Claude tries to stay focused and share fewer, high quality examples or ideas rather than many.

Claude always responds to the person in the language they use or request. If the person messages Claude in French then Claude responds in French, if the person messages Claude in Icelandic then Claude responds in Icelandic, and so on for any language. Claude is fluent in a wide variety of world languages.

Claude is now being connected with a person."""

# ====== 读取 Huggingface Secret 配置的私有key =======
PRIVATE_KEY = os.environ.get("PRIVATE_KEY", "") 
SAFE_HEADERS = ["Authorization", "X-API-KEY"] 

# 全局接口访问权限检查
def check_private_key():
    if request.path in ["/", "/favicon.ico"]:
        return None 

    key_from_header = None
    for header_name in SAFE_HEADERS:
        key_from_header = request.headers.get(header_name)
        if key_from_header:
            if header_name == "Authorization" and key_from_header.startswith("Bearer "):
                key_from_header = key_from_header[len("Bearer "):].strip()
            break
    
    if not PRIVATE_KEY: 
        logging.warning("PRIVATE_KEY 未设置，服务将不进行鉴权！")
        return None

    if not key_from_header or key_from_header != PRIVATE_KEY:
        logging.warning(f"未授权访问尝试: Path={request.path}, IP={request.remote_addr}, Key Provided='{key_from_header[:10]}...'")
        return jsonify({"error": "Unauthorized. Correct 'Authorization: Bearer <PRIVATE_KEY>' or 'X-API-KEY: <PRIVATE_KEY>' header is required."}), 401
    return None 

app = Flask(__name__)
app.before_request(check_private_key)

ONDEMAND_APIKEYS_STR = os.environ.get("ONDEMAND_APIKEYS", "")
ONDEMAND_APIKEYS = [key.strip() for key in ONDEMAND_APIKEYS_STR.split(',') if key.strip()]
BAD_KEY_RETRY_INTERVAL = 600  

MODEL_MAP = {
    "gpto3-mini": "predefined-openai-gpto3-mini",
    "gpt-4o": "predefined-openai-gpt4o",
    "gpt-4.1": "predefined-openai-gpt4.1",
    "gpt-4.1-mini": "predefined-openai-gpt4.1-mini",
    "gpt-4.1-nano": "predefined-openai-gpt4.1-nano",
    "gpt-4o-mini": "predefined-openai-gpt4o-mini",
    "deepseek-v3": "predefined-deepseek-v3",
    "deepseek-r1": "predefined-deepseek-r1",
    "claude-3.7-sonnet": "predefined-claude-3.7-sonnet",
    "gemini-2.0-flash": "predefined-gemini-2.0-flash",
}
DEFAULT_ONDEMAND_MODEL = "predefined-openai-gpt4o"

class KeyManager:
    def __init__(self, key_list):
        self.key_list = list(key_list) 
        self.lock = threading.Lock()   
        self.key_status = {key: {"bad": False, "bad_ts": None} for key in self.key_list}
        self.idx = 0 

    def display_key(self, key):
        if not key or len(key) < 10:
            return "INVALID_KEY_FORMAT"
        return f"{key[:6]}...{key[-4:]}"

    def get(self):
        with self.lock:
            if not self.key_list: 
                logging.error("【KeyManager】API密钥池为空！无法提供密钥。")
                raise ValueError("API key pool is empty.")

            now = time.time()
            num_keys = len(self.key_list)

            for i in range(num_keys): 
                current_key_candidate = self.key_list[self.idx]
                self.idx = (self.idx + 1) % num_keys 
                status = self.key_status[current_key_candidate]

                if not status["bad"]: 
                    logging.info(f"【KeyManager】选择API KEY: {self.display_key(current_key_candidate)} [状态：正常]")
                    return current_key_candidate
                
                if status["bad_ts"] and (now - status["bad_ts"] >= BAD_KEY_RETRY_INTERVAL):
                    logging.info(f"【KeyManager】API KEY: {self.display_key(current_key_candidate)} 达到重试周期，恢复为正常。")
                    status["bad"] = False
                    status["bad_ts"] = None
                    return current_key_candidate
            
            logging.warning("【KeyManager】所有API KEY均被标记为不良且未到重试时间。将强制重置所有KEY状态并尝试第一个。")
            for key_to_reset in self.key_list:
                self.key_status[key_to_reset]["bad"] = False
                self.key_status[key_to_reset]["bad_ts"] = None
            self.idx = 0
            if self.key_list: 
                 selected_key = self.key_list[0]
                 logging.info(f"【KeyManager】强制选择API KEY: {self.display_key(selected_key)} [状态：强制重试]")
                 return selected_key
            else: 
                logging.error("【KeyManager】在强制重试逻辑中发现密钥池为空！")
                raise ValueError("API key pool became empty during forced retry logic.")

    def mark_bad(self, key):
        with self.lock:
            if key in self.key_status and not self.key_status[key]["bad"]:
                logging.warning(f"【KeyManager】禁用API KEY: {self.display_key(key)}。将在 {BAD_KEY_RETRY_INTERVAL // 60} 分钟后自动重试。")
                self.key_status[key]["bad"] = True
                self.key_status[key]["bad_ts"] = time.time()

if not ONDEMAND_APIKEYS:
    logging.warning("【启动警告】ONDEMAND_APIKEYS 环境变量未设置或为空。服务可能无法正常工作。")
keymgr = KeyManager(ONDEMAND_APIKEYS)

ONDEMAND_API_BASE = "https://api.on-demand.io/chat/v1" 

def get_endpoint_id(openai_model_name):
    normalized_model_name = str(openai_model_name or "").lower().replace(" ", "")
    return MODEL_MAP.get(normalized_model_name, DEFAULT_ONDEMAND_MODEL)

def create_session(apikey, external_user_id=None, plugin_ids=None):
    url = f"{ONDEMAND_API_BASE}/sessions"
    payload = {"externalUserId": external_user_id or str(uuid.uuid4())} 
    if plugin_ids is not None: 
        payload["pluginIds"] = plugin_ids
    
    headers = {"apikey": apikey, "Content-Type": "application/json"}
    
    logging.info(f"【OnDemand】尝试创建新会话... URL: {url}, Key: {keymgr.display_key(apikey)}")
    try:
        resp = requests.post(url, json=payload, headers=headers, timeout=20) 
        resp.raise_for_status() 
        session_id = resp.json()["data"]["id"]
        logging.info(f"【OnDemand】新会话创建成功: {session_id}, Key: {keymgr.display_key(apikey)}")
        return session_id
    except requests.exceptions.Timeout:
        logging.error(f"【OnDemand】创建会话超时。URL: {url}, Key: {keymgr.display_key(apikey)}")
        raise
    except requests.exceptions.RequestException as e:
        logging.error(f"【OnDemand】创建会话失败。URL: {url}, Key: {keymgr.display_key(apikey)}, 错误: {e}, 响应: {e.response.text if e.response else 'N/A'}")
        raise

def format_openai_sse_delta(chunk_data_dict):
    return f"data: {json.dumps(chunk_data_dict, ensure_ascii=False)}\n\n"

def _execute_one_stream_attempt(apikey_for_attempt, session_id_for_attempt, query_str, endpoint_id, openai_model_name_for_response, current_attempt_num_logging):
    url = f"{ONDEMAND_API_BASE}/sessions/{session_id_for_attempt}/query"
    payload = {
        "query": query_str,
        "endpointId": endpoint_id,
        "pluginIds": [],
        "responseMode": "stream"
    }
    headers = {
        "apikey": apikey_for_attempt,
        "Content-Type": "application/json",
        "Accept": "text/event-stream"
    }

    accumulated_text_parts = []
    api_error_yielded = False 
    
    max_500_retries_for_this_call = 5
    current_500_retry_count = 0

    while current_500_retry_count < max_500_retries_for_this_call:
        current_500_retry_count += 1
        if current_500_retry_count > 1: 
            logging.info(f"【流式请求子尝试 {current_attempt_num_logging} - 500错误重试 {current_500_retry_count-1}/{max_500_retries_for_this_call-1}】Key: {keymgr.display_key(apikey_for_attempt)}")
        else:
             logging.info(f"【流式请求子尝试 {current_attempt_num_logging}】发送到 OnDemand: Session={session_id_for_attempt}, Endpoint={endpoint_id}, Key={keymgr.display_key(apikey_for_attempt)}")

        try:
            with requests.post(url, json=payload, headers=headers, stream=True, timeout=180) as resp:
                if resp.status_code == 500: 
                    logging.warning(f"【OnDemand流错误】(子尝试 {current_attempt_num_logging}, 500重试 {current_500_retry_count}) 收到500错误。Session: {session_id_for_attempt}")
                    if current_500_retry_count >= max_500_retries_for_this_call:
                        logging.error(f"【OnDemand流错误】(子尝试 {current_attempt_num_logging}) 达到500错误最大重试次数。将错误传递给上层。")
                        api_error_yielded = True
                        error_payload = {"error": {"message": f"OnDemand API persistent 500 error after {max_500_retries_for_this_call} retries (Attempt {current_attempt_num_logging}).", 
                                                   "type": "on_demand_persistent_500_error", "code": 500}}
                        yield format_openai_sse_delta(error_payload)
                        yield "data: [DONE]\n\n"
                        return "".join(accumulated_text_parts).strip(), api_error_yielded
                    time.sleep(1) 
                    continue 

                if resp.status_code != 200: 
                    api_error_yielded = True
                    error_text = resp.text
                    logging.error(f"【OnDemand流错误】请求失败 (子尝试 {current_attempt_num_logging})。状态码: {resp.status_code}, Session: {session_id_for_attempt}, 响应: {error_text[:500]}")
                    error_payload = {
                        "error": {
                            "message": f"OnDemand API Error (Stream Init, Attempt {current_attempt_num_logging}): {resp.status_code} - {error_text[:200]}",
                            "type": "on_demand_api_error",
                            "code": resp.status_code
                        }
                    }
                    yield format_openai_sse_delta(error_payload)
                    yield "data: [DONE]\n\n"
                    return "".join(accumulated_text_parts).strip(), api_error_yielded 

                first_chunk_sent = False
                last_line_str = "" 
                for line_bytes in resp.iter_lines():
                    if not line_bytes:
                        continue
                    line_str = line_bytes.decode("utf-8")
                    last_line_str = line_str 

                    if line_str.startswith("data:"):
                        data_part = line_str[len("data:"):].strip()
                        if data_part == "[DONE]":
                            logging.info(f"【OnDemand流】接收到 [DONE] 信号 (子尝试 {current_attempt_num_logging})。Session: {session_id_for_attempt}")
                            yield "data: [DONE]\n\n"
                            return "".join(accumulated_text_parts).strip(), api_error_yielded
                        elif data_part.startswith("[ERROR]:"):
                            api_error_yielded = True 
                            error_json_str = data_part[len("[ERROR]:"):].strip()
                            logging.warning(f"【OnDemand流】接收到错误事件 (子尝试 {current_attempt_num_logging}): {error_json_str}。Session: {session_id_for_attempt}")
                            try:
                                error_obj = json.loads(error_json_str)
                            except json.JSONDecodeError:
                                error_obj = {"message": error_json_str, "type": "on_demand_stream_error_format"}
                            yield format_openai_sse_delta({"error": error_obj})
                            yield "data: [DONE]\n\n" 
                            return "".join(accumulated_text_parts).strip(), api_error_yielded 
                        else:
                            try:
                                event_data = json.loads(data_part)
                                if event_data.get("eventType") == "fulfillment":
                                    delta_content = event_data.get("answer", "") 
                                    if delta_content is None: delta_content = ""
                                    accumulated_text_parts.append(delta_content)
                                    choice_delta = {}
                                    if not first_chunk_sent:
                                        choice_delta["role"] = "assistant"
                                        choice_delta["content"] = delta_content
                                        first_chunk_sent = True
                                    else:
                                        choice_delta["content"] = delta_content
                                    if not choice_delta.get("content") and not choice_delta.get("role"):
                                        if not (choice_delta.get("role") and not choice_delta.get("content")):
                                            continue
                                    openai_chunk = {
                                        "id": "chatcmpl-" + str(uuid.uuid4())[:12],
                                        "object": "chat.completion.chunk",
                                        "created": int(time.time()),
                                        "model": openai_model_name_for_response,
                                        "choices": [{"delta": choice_delta, "index": 0, "finish_reason": None}]
                                    }
                                    yield format_openai_sse_delta(openai_chunk) 
                            except json.JSONDecodeError:
                                logging.warning(f"【OnDemand流】无法解析JSON (子尝试 {current_attempt_num_logging}): {data_part[:100]}... Session: {session_id_for_attempt}")
                                continue
                
                if not api_error_yielded and not last_line_str.startswith("data: [DONE]"): 
                     logging.info(f"【OnDemand流】(子尝试 {current_attempt_num_logging}) 流迭代完成，补充发送 [DONE]。Session: {session_id_for_attempt}")
                     yield "data: [DONE]\n\n"
                return "".join(accumulated_text_parts).strip(), api_error_yielded 

        except requests.exceptions.RequestException as e_req_inner: 
            logging.error(f"【OnDemand流】(子尝试 {current_attempt_num_logging}) 请求时发生异常: {e_req_inner}, Key: {keymgr.display_key(apikey_for_attempt)}")
            if current_500_retry_count >= max_500_retries_for_this_call or (hasattr(e_req_inner, 'response') and e_req_inner.response is not None and e_req_inner.response.status_code != 500):
                raise e_req_inner 
            time.sleep(1) 
        
        except Exception as e_inner_unknown: 
            logging.error(f"【OnDemand流】处理流时发生未知错误 (子尝试 {current_attempt_num_logging}): {e_inner_unknown}, Session: {session_id_for_attempt}", exc_info=True)
            api_error_yielded = True 
            error_payload = {
                "error": {"message": f"Unknown error during streaming (Attempt {current_attempt_num_logging}): {str(e_inner_unknown)}", "type": "unknown_streaming_error_in_attempt"}
            }
            yield format_openai_sse_delta(error_payload)
            yield "data: [DONE]\n\n"
            return "".join(accumulated_text_parts).strip(), api_error_yielded
    
    logging.error(f"【OnDemand流】(子尝试 {current_attempt_num_logging}) 500错误重试循环意外结束。")
    raise requests.exceptions.RequestException(f"Exhausted internal 500 retries for attempt {current_attempt_num_logging} without success or specific error propagation.")


@app.route("/v1/chat/completions", methods=["POST"])
def chat_completions():
    try:
        request_data = request.json
    except Exception as e:
        logging.warning(f"无法解析请求JSON: {e}")
        return jsonify({"error": "Invalid JSON in request body."}), 400

    if not request_data or "messages" not in request_data:
        return jsonify({"error": "Request body must be JSON and include a 'messages' field."}), 400

    messages = request_data["messages"]
    if not isinstance(messages, list) or not messages:
        return jsonify({"error": "'messages' must be a non-empty list."}), 400

    openai_model_name = request_data.get("model", "gpt-4o") 
    target_endpoint_id = get_endpoint_id(openai_model_name)
    is_stream_request = bool(request_data.get("stream", False))

    formatted_query_parts = []
    for msg in messages:
        role = msg.get("role", "user").strip().capitalize()
        content = msg.get("content", "") 
        content_string = ""
        if isinstance(content, list): 
            temp_parts = []
            for item in content:
                if isinstance(item, dict) and item.get("type") == "text":
                    temp_parts.append(item.get("text", ""))
                elif isinstance(item, dict): 
                    for k, v_item in item.items(): 
                        content_string += f"{k}: {v_item}\n{k}: {v_item}" 
            if not content_string and temp_parts: 
                 content_string = "\n".join(filter(None, temp_parts))
        elif isinstance(content, str):
            content_string = content
        
        content_string = content_string.strip()
        if not content_string: 
            continue
        formatted_query_parts.append(f"<|{role}|>: {content_string}") 
    
    if not formatted_query_parts:
        return jsonify({"error": "No valid content found in 'messages'."}), 400

    start_prompt = CLAUDE_SYSTEM_PROMPT + "\n\n" + """下面是对话历史. 你是Assitant角色，请遵从User指令，并用中文尽可能详细的回复。注意，请直接回复! 请不要在开头提出"根据上下文及历史记录"相关的话语。\n"""
    final_query_to_ondemand = start_prompt + "\n".join(formatted_query_parts)
    
    def attempt_ondemand_request_wrapper(current_apikey_from_wrapper, current_session_id_from_wrapper):
        if is_stream_request:
            return Response(
                handle_stream_request(current_apikey_from_wrapper, current_session_id_from_wrapper, final_query_to_ondemand, target_endpoint_id, openai_model_name),
                content_type='text/event-stream'
            )
        else:
            return handle_non_stream_request(current_apikey_from_wrapper, current_session_id_from_wrapper, final_query_to_ondemand, target_endpoint_id, openai_model_name)

    def with_valid_key_and_session(action_func_to_wrap):
        max_key_retries = len(ONDEMAND_APIKEYS) * 2 if ONDEMAND_APIKEYS else 1 
        key_retry_count = 0
        last_exception_for_key_retry = None

        while key_retry_count < max_key_retries:
            key_retry_count += 1
            selected_apikey_for_outer_retry = None
            try:
                selected_apikey_for_outer_retry = keymgr.get() 
                logging.info(f"【请求处理 - Key轮换尝试 {key_retry_count}/{max_key_retries}】使用 API Key: {keymgr.display_key(selected_apikey_for_outer_retry)}，准备创建新会话...")
                ondemand_session_id_for_outer_retry = create_session(selected_apikey_for_outer_retry)
                return action_func_to_wrap(selected_apikey_for_outer_retry, ondemand_session_id_for_outer_retry)

            except ValueError as ve: 
                logging.critical(f"【请求处理 - Key轮换尝试 {key_retry_count}】KeyManager 错误: {ve}")
                last_exception_for_key_retry = ve
                break 
            except requests.exceptions.RequestException as http_err_outer: 
                last_exception_for_key_retry = http_err_outer
                status_code_from_exc = None
                if hasattr(http_err_outer, 'response') and http_err_outer.response is not None:
                    status_code_from_exc = http_err_outer.response.status_code
                
                logging.warning(f"【请求处理 - Key轮换尝试 {key_retry_count}】HTTP/请求错误。Status: {status_code_from_exc}, Key: {keymgr.display_key(selected_apikey_for_outer_retry) if selected_apikey_for_outer_retry else 'N/A'}, Error: {http_err_outer}")
                
                if selected_apikey_for_outer_retry: 
                    if status_code_from_exc == 524: 
                        logging.info(f"【KeyManager】Key {keymgr.display_key(selected_apikey_for_outer_retry)} not marked bad due to 524 error.")
                    elif status_code_from_exc == 500: 
                        logging.info(f"【KeyManager】Key {keymgr.display_key(selected_apikey_for_outer_retry)} not marked bad due to 500 error.")
                    elif status_code_from_exc and ((400 <= status_code_from_exc < 500) or status_code_from_exc in [502, 503]): # Explicitly list codes that mark bad, excluding 500, 524
                        keymgr.mark_bad(selected_apikey_for_outer_retry)
                    elif not status_code_from_exc : 
                         keymgr.mark_bad(selected_apikey_for_outer_retry)

                if key_retry_count >= max_key_retries:
                    logging.error(f"【请求处理】所有Key轮换尝试均失败。最后错误: {last_exception_for_key_retry}")
                    break 
                
                logging.info(f"【请求处理】Key轮换尝试 {key_retry_count} 失败，等待后重试下一个Key...")
                time.sleep(1) 
                continue 
            except Exception as e_outer: 
                last_exception_for_key_retry = e_outer
                logging.error(f"【请求处理 - Key轮换尝试 {key_retry_count}】发生意外严重错误: {e_outer}", exc_info=True)
                if selected_apikey_for_outer_retry: 
                    keymgr.mark_bad(selected_apikey_for_outer_retry) 
                break 
        
        error_message = "重试次数过多，请检查上下文长度! 或联系管理员!" 
        error_code_str = "max_retries_check_context_contact_admin" 
        
        logging.error(f"【请求处理】所有Key/Session获取尝试失败。最终错误: {error_message} Last underlying exception: {last_exception_for_key_retry}")

        if is_stream_request:
            def error_stream_gen():
                yield format_openai_sse_delta({"error": {"message": error_message, "type": "proxy_max_retries_exceeded", "code": error_code_str}})
                yield "data: [DONE]\n\n"
            return Response(error_stream_gen(), content_type='text/event-stream', status=500) 
        else:
            return jsonify({"error": error_message, "code": error_code_str}), 500 

    return with_valid_key_and_session(attempt_ondemand_request_wrapper)

def handle_stream_request(initial_apikey, initial_session_id, query_str, endpoint_id, openai_model_name_for_response):
    max_empty_response_retries = 5
    empty_retry_attempt_num = 0
    
    current_apikey_for_attempt = initial_apikey
    current_session_id_for_attempt = initial_session_id
    
    while empty_retry_attempt_num < max_empty_response_retries:
        empty_retry_attempt_num += 1
        accumulated_text_this_attempt = ""
        api_error_in_attempt = False 
        
        if empty_retry_attempt_num > 1: 
            logging.info(f"【流式请求-空回复重试 {empty_retry_attempt_num-1}】获取新Key/Session...")
            try:
                current_apikey_for_attempt = keymgr.get()
                current_session_id_for_attempt = create_session(current_apikey_for_attempt)
                logging.info(f"【流式请求-空回复重试 {empty_retry_attempt_num-1}】新Key/Session获取成功: Key={keymgr.display_key(current_apikey_for_attempt)}, Session={current_session_id_for_attempt}")
            except (ValueError, requests.exceptions.RequestException) as e_key_session:
                logging.warning(f"【流式请求-空回复重试 {empty_retry_attempt_num-1}】获取新Key/Session失败: {e_key_session}")
                status_code_from_exc_retry_setup = None
                if hasattr(e_key_session, 'response') and e_key_session.response is not None:
                    status_code_from_exc_retry_setup = e_key_session.response.status_code

                if current_apikey_for_attempt and not isinstance(e_key_session, ValueError): 
                    if status_code_from_exc_retry_setup == 524:
                        logging.info(f"【KeyManager】Key {keymgr.display_key(current_apikey_for_attempt)} not marked bad for 524 error during key/session acquisition for stream retry.")
                    elif status_code_from_exc_retry_setup == 500:
                        logging.info(f"【KeyManager】Key {keymgr.display_key(current_apikey_for_attempt)} not marked bad for 500 error during key/session acquisition for stream retry.")
                    else:
                        keymgr.mark_bad(current_apikey_for_attempt)

                if empty_retry_attempt_num >= max_empty_response_retries:
                    final_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
                    final_error_code = "max_retries_check_context_contact_admin"
                    logging.error(f"【流式请求】无法为最终空回复重试获取新Key/Session。错误: {e_key_session}")
                    yield format_openai_sse_delta({"error": {"message": final_error_message, "type": "proxy_final_retry_setup_failed", "code": final_error_code, "details": str(e_key_session)}})
                    yield "data: [DONE]\n\n"
                    return 
                time.sleep(1)
                current_apikey_for_attempt = None 
                continue 

        log_attempt_str = f"初始尝试" if empty_retry_attempt_num == 1 else f"空回复重试 {empty_retry_attempt_num-1}"

        try:
            result_tuple = yield from _execute_one_stream_attempt(
                current_apikey_for_attempt, 
                current_session_id_for_attempt, 
                query_str, 
                endpoint_id, 
                openai_model_name_for_response, 
                f"{log_attempt_str} (Overall attempt {empty_retry_attempt_num})"
            )
            accumulated_text_this_attempt = result_tuple[0]
            api_error_in_attempt = result_tuple[1] 

        except requests.exceptions.RequestException as e_req: 
            log_key_display = keymgr.display_key(current_apikey_for_attempt) if current_apikey_for_attempt else "N/A"
            status_code_from_exc_stream = None
            if hasattr(e_req, 'response') and e_req.response is not None:
                status_code_from_exc_stream = e_req.response.status_code
            
            logging.warning(f"【流式请求】({log_attempt_str} using key {log_key_display}) 发生请求级错误: {e_req}, Status: {status_code_from_exc_stream}")
            
            if current_apikey_for_attempt:
                if status_code_from_exc_stream == 524:
                    logging.info(f"【KeyManager】Key {log_key_display} not marked bad for 524 error during stream attempt.")
                elif status_code_from_exc_stream == 500:
                    logging.info(f"【KeyManager】Key {log_key_display} not marked bad for 500 error during stream attempt.")
                else:
                    keymgr.mark_bad(current_apikey_for_attempt)

            if empty_retry_attempt_num == 1: 
                raise e_req 
            
            if empty_retry_attempt_num >= max_empty_response_retries:
                final_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
                final_error_code = "max_retries_check_context_contact_admin"
                logging.error(f"【流式请求】在最后一次空回复重试时发生请求错误: {e_req}")
                yield format_openai_sse_delta({"error": {"message": final_error_message, "type": "proxy_final_retry_request_failed", "code": final_error_code, "details": str(e_req)}})
                yield "data: [DONE]\n\n"
                return 
            time.sleep(1)
            continue 
            
        if api_error_in_attempt: 
            logging.warning(f"【流式请求】({log_attempt_str}) 子尝试已处理并流式传输API错误。")
            return 

        if accumulated_text_this_attempt: 
            logging.info(f"【流式请求】({log_attempt_str}) 成功获取非空内容。")
            return 
        
        logging.warning(f"【流式请求】({log_attempt_str}) 返回空内容。")
        if empty_retry_attempt_num >= max_empty_response_retries:
            final_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
            final_error_code = "max_retries_check_context_contact_admin"
            logging.error(f"【流式请求】达到最大空回复重试次数 ({max_empty_response_retries})。将返回指定错误。")
            yield format_openai_sse_delta({
                "error": {"message": final_error_message, "type": "max_empty_retries_exceeded", "code": final_error_code}
            })
            yield "data: [DONE]\n\n"
            return 
        
        logging.info(f"【流式请求】空回复，将在1秒后重试下一个Key。当前总尝试 {empty_retry_attempt_num}/{max_empty_response_retries}")
        time.sleep(1)

    final_fallback_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
    final_fallback_error_code = "max_retries_check_context_contact_admin_fallback"
    logging.error(f"【流式请求】意外退出空回复重试循环。返回最终错误。")
    yield format_openai_sse_delta({"error": {"message": final_fallback_error_message, "type": "internal_proxy_error_unexpected_exit", "code": final_fallback_error_code}})
    yield "data: [DONE]\n\n"


def handle_non_stream_request(initial_apikey, initial_session_id, query_str, endpoint_id, openai_model_name_for_response):
    max_empty_response_retries = 5 
    empty_retry_attempt_num = 0 

    current_apikey_for_attempt = initial_apikey
    current_session_id_for_attempt = initial_session_id
    
    ai_response_content = "" # Define ai_response_content outside the try block to ensure it's available for the final empty check

    while empty_retry_attempt_num < max_empty_response_retries:
        empty_retry_attempt_num += 1
        
        if empty_retry_attempt_num > 1: 
            logging.info(f"【同步请求-空回复重试 {empty_retry_attempt_num-1}】获取新Key/Session...")
            try:
                current_apikey_for_attempt = keymgr.get()
                current_session_id_for_attempt = create_session(current_apikey_for_attempt)
                logging.info(f"【同步请求-空回复重试 {empty_retry_attempt_num-1}】新Key/Session获取成功: Key={keymgr.display_key(current_apikey_for_attempt)}, Session={current_session_id_for_attempt}")
            except (ValueError, requests.exceptions.RequestException) as e_key_session:
                logging.warning(f"【同步请求-空回复重试 {empty_retry_attempt_num-1}】获取新Key/Session失败: {e_key_session}")
                status_code_from_exc_retry_setup_ns = None
                if hasattr(e_key_session, 'response') and e_key_session.response is not None:
                    status_code_from_exc_retry_setup_ns = e_key_session.response.status_code
                
                if current_apikey_for_attempt and not isinstance(e_key_session, ValueError): 
                    if status_code_from_exc_retry_setup_ns == 524:
                        logging.info(f"【KeyManager】Key {keymgr.display_key(current_apikey_for_attempt)} not marked bad for 524 error during key/session acquisition for non-stream retry.")
                    elif status_code_from_exc_retry_setup_ns == 500:
                        logging.info(f"【KeyManager】Key {keymgr.display_key(current_apikey_for_attempt)} not marked bad for 500 error during key/session acquisition for non-stream retry.")
                    else:
                        keymgr.mark_bad(current_apikey_for_attempt)

                if empty_retry_attempt_num >= max_empty_response_retries:
                    final_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
                    final_error_code = "max_retries_check_context_contact_admin"
                    logging.error(f"【同步请求】无法为最终空回复重试获取新Key/Session。错误: {e_key_session}")
                    return jsonify({"error": final_error_message, "code": final_error_code, "details": str(e_key_session)}), 500 
                time.sleep(1)
                current_apikey_for_attempt = None 
                continue 
        
        log_attempt_str = f"初始尝试" if empty_retry_attempt_num == 1 else f"空回复重试 {empty_retry_attempt_num-1}"
        
        max_500_retries_for_this_call = 5
        current_500_retry_count = 0
        
        # Reset ai_response_content for each new attempt (especially for the 500-retry loop)
        ai_response_content = "" 
        
        while current_500_retry_count < max_500_retries_for_this_call:
            current_500_retry_count += 1
            if current_500_retry_count > 1:
                logging.info(f"【同步请求】({log_attempt_str}, 总尝试 {empty_retry_attempt_num}, 500错误重试 {current_500_retry_count-1}/{max_500_retries_for_this_call-1}) Session={current_session_id_for_attempt}, Key={keymgr.display_key(current_apikey_for_attempt)}")
            else:
                logging.info(f"【同步请求】({log_attempt_str}, 总尝试 {empty_retry_attempt_num}) Session={current_session_id_for_attempt}, Key={keymgr.display_key(current_apikey_for_attempt)}")

            url = f"{ONDEMAND_API_BASE}/sessions/{current_session_id_for_attempt}/query" 
            # Corrected: Use query_str and endpoint_id parameters passed to the function
            payload = { "query": query_str, "endpointId": endpoint_id, "pluginIds": [], "responseMode": "sync" } 
            headers = {"apikey": current_apikey_for_attempt, "Content-Type": "application/json"}
            
            try:
                resp = requests.post(url, json=payload, headers=headers, timeout=120) 

                if resp.status_code == 500:
                    logging.warning(f"【OnDemand同步错误】({log_attempt_str}, 500重试 {current_500_retry_count}) 收到500错误。")
                    if current_500_retry_count >= max_500_retries_for_this_call:
                        logging.error(f"【OnDemand同步错误】({log_attempt_str}) 达到500错误最大重试次数。将错误传递给上层。")
                        resp.raise_for_status() 
                    time.sleep(1) 
                    continue 

                resp.raise_for_status() 

                response_json = resp.json()
                if "data" not in response_json or "answer" not in response_json["data"]:
                    logging.error(f"【OnDemand同步错误】响应格式不符合预期 ({log_attempt_str})。Session: {current_session_id_for_attempt}, 响应: {str(response_json)[:500]}")
                    raise ValueError(f"OnDemand API sync response missing 'data.answer' field on attempt {empty_retry_attempt_num}, 500-retry {current_500_retry_count}.") 
                
                ai_response_content = response_json["data"]["answer"]
                if ai_response_content is None: ai_response_content = "" 

                if ai_response_content.strip(): 
                    logging.info(f"【同步请求】({log_attempt_str}, 500重试 {current_500_retry_count}) 成功获取非空内容。")
                    openai_response_obj = {
                        "id": "chatcmpl-" + str(uuid.uuid4())[:12], "object": "chat.completion", "created": int(time.time()),
                        "model": openai_model_name_for_response,
                        "choices": [{"index": 0, "message": {"role": "assistant", "content": ai_response_content}, "finish_reason": "stop"}],
                        "usage": {} 
                    }
                    return jsonify(openai_response_obj) # SUCCESS
                else: 
                    logging.warning(f"【同步请求】({log_attempt_str}, 500重试 {current_500_retry_count}) 返回空回复。")
                    break 
            
            except requests.exceptions.RequestException as e_req: 
                log_key_display_sync = keymgr.display_key(current_apikey_for_attempt) if current_apikey_for_attempt else "N/A"
                status_code_from_exc_sync = None
                if hasattr(e_req, 'response') and e_req.response is not None:
                    status_code_from_exc_sync = e_req.response.status_code
                
                logging.warning(f"【同步请求】({log_attempt_str}, 500重试 {current_500_retry_count} using key {log_key_display_sync}) 发生请求级错误: {e_req}, Status: {status_code_from_exc_sync}")
                
                if current_500_retry_count >= max_500_retries_for_this_call or status_code_from_exc_sync != 500:
                    if empty_retry_attempt_num == 1:
                        raise e_req 
                    else: 
                        raise e_req 
                
                time.sleep(1)
                # Continue to the next iteration of current_500_retry_count loop
            
            except (ValueError, KeyError, json.JSONDecodeError) as e_parse: 
                logging.error(f"【同步请求】({log_attempt_str}, 500重试 {current_500_retry_count}) 处理响应或格式时出错: {e_parse}", exc_info=True)
                if empty_retry_attempt_num == 1 and current_500_retry_count == 1 : 
                     raise requests.exceptions.RequestException(f"Response format error on first attempt: {e_parse}") from e_parse
                raise requests.exceptions.RequestException(f"Response format error during retry: {e_parse}") from e_parse

        # After the 500-retry loop for the current key/session
        if ai_response_content.strip(): # Should have been returned if non-empty
            pass # Should not reach here if content was found
        else: # Content is still empty for this key/session after 500-retries (or if 200 OK but empty)
            if empty_retry_attempt_num >= max_empty_response_retries:
                final_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
                final_error_code = "max_retries_check_context_contact_admin"
                logging.error(f"【同步请求】达到最大空回复重试次数 ({max_empty_response_retries})。将返回指定错误。")
                return jsonify({
                    "error": final_error_message, 
                    "id": "chatcmpl-" + str(uuid.uuid4())[:12], "object": "chat.completion", "created": int(time.time()),
                    "model": openai_model_name_for_response,
                    "choices": [{"index": 0, "message": {"role": "assistant", "content": ""}, "finish_reason": "length"}], 
                    "usage": {}, "code": final_error_code 
                }), 500 
            logging.info(f"【同步请求】空回复（在500-重试循环之后），准备进行下一个空回复尝试。当前总尝试 {empty_retry_attempt_num}/{max_empty_response_retries}")
            time.sleep(1) 
            # Outer loop (empty_retry_attempt_num) will continue to try a new key/session

    final_fallback_error_message = "重试次数过多，请检查上下文长度! 或联系管理员!"
    final_fallback_error_code = "max_retries_check_context_contact_admin_fallback"
    logging.error(f"【同步请求】意外退出空回复重试循环。返回最终错误。") 
    return jsonify({"error": final_fallback_error_message, "code": final_fallback_error_code}), 500


@app.route("/v1/models", methods=["GET"])
def list_models():
    model_objects = []
    for model_key_alias in MODEL_MAP.keys():
        model_objects.append({
            "id": model_key_alias, 
            "object": "model",
            "created": int(time.time()), 
            "owned_by": "ondemand-proxy" 
        })
    return jsonify({
        "object": "list",
        "data": model_objects
    })

@app.route("/", methods=["GET"])
def health_check():
    num_keys = len(ONDEMAND_APIKEYS)
    key_status_summary = {keymgr.display_key(k): ("OK" if not v["bad"] else f"BAD (since {time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(v['bad_ts'])) if v['bad_ts'] else 'N/A'})") for k, v in keymgr.key_status.items()}
    
    return jsonify({
        "status": "ok",
        "message": "OnDemand API Proxy is running.",
        "timestamp": time.strftime('%Y-%m-%d %H:%M:%S UTC', time.gmtime()),
        "ondemand_api_keys_loaded": num_keys,
        "ondemand_api_key_pool_status": key_status_summary if num_keys > 0 else "No keys loaded.",
        "model_mapping_enabled": True,
        "default_on_demand_model": DEFAULT_ONDEMAND_MODEL,
        "available_models_via_proxy": list(MODEL_MAP.keys())
    }), 200


if __name__ == "__main__":
    log_format = '[%(asctime)s] %(levelname)s in %(module)s (%(funcName)s): %(message)s'
    logging.basicConfig(level=os.environ.get("LOG_LEVEL", "INFO").upper(), format=log_format)

    if not PRIVATE_KEY:
        logging.warning("****************************************************************")
        logging.warning("* WARNING: PRIVATE_KEY environment variable is not set.        *")
        logging.warning("* The proxy service will be UNSECURED and open to anyone.      *")
        logging.warning("* For production, set PRIVATE_KEY to a strong secret value.    *")
        logging.warning("****************************************************************")

    if not ONDEMAND_APIKEYS:
        logging.warning("****************************************************************")
        logging.warning("* WARNING: ONDEMAND_APIKEYS environment variable is not set    *")
        logging.warning("* or is empty. The proxy will not be able to connect to        *")
        logging.warning("* the OnDemand service.                                        *")
        logging.warning("****************************************************************")
    else:
        logging.info(f"======== OnDemand API KEY 池数量: {len(ONDEMAND_APIKEYS)} ========")
        for i, key_val in enumerate(ONDEMAND_APIKEYS):
            logging.info(f"  Key [{i+1}]: {keymgr.display_key(key_val)}")
    
    logging.info(f"======== 默认 OnDemand 模型 Endpoint ID: {DEFAULT_ONDEMAND_MODEL} ========")
    logging.info(f"======== 模型映射表 (User Model -> OnDemand Endpoint ID):")
    for user_model, od_endpoint in MODEL_MAP.items():
        logging.info(f"  '{user_model}' -> '{od_endpoint}'")

    port = int(os.environ.get("PORT", 7860))
    app.run(host="0.0.0.0", port=port, debug=False)