utils.py

import json
from fastapi import HTTPException
import httpx

from log_config import logger
from collections import defaultdict

import asyncio

class ThreadSafeCircularList:
    def __init__(self, items):
        self.items = items
        self.index = 0
        self.lock = asyncio.Lock()

    async def next(self):
        async with self.lock:
            item = self.items[self.index]
            self.index = (self.index + 1) % len(self.items)
            return item

def circular_list_encoder(obj):
    if isinstance(obj, ThreadSafeCircularList):
        return obj.to_dict()
    raise TypeError(f'Object of type {obj.__class__.__name__} is not JSON serializable')

provider_api_circular_list = defaultdict(ThreadSafeCircularList)

def get_model_dict(provider):
    model_dict = {}
    for model in provider['model']:
        if type(model) == str:
            model_dict[model] = model
        if isinstance(model, dict):
            model_dict.update({new: old for old, new in model.items()})
    return model_dict

def update_initial_model(api_url, api):
    try:
        endpoint = BaseAPI(api_url=api_url)
        endpoint_models_url = endpoint.v1_models
        if isinstance(api, list):
            api = api[0]
        response = httpx.get(
            endpoint_models_url,
            headers={"Authorization": f"Bearer {api}"},
        )
        models = response.json()
        if models.get("error"):
            raise Exception({"error": models.get("error"), "endpoint": endpoint_models_url, "api": api})
        # print(models)
        models_list = models["data"]
        models_id = [model["id"] for model in models_list]
        set_models = set()
        for model_item in models_id:
            set_models.add(model_item)
        models_id = list(set_models)
        # print(models_id)
        return models_id
    except Exception as e:
        # print("error:", e)
        import traceback
        traceback.print_exc()
        return []

from ruamel.yaml import YAML, YAMLError
yaml = YAML()
yaml.preserve_quotes = True
yaml.indent(mapping=2, sequence=4, offset=2)

API_YAML_PATH = "./api.yaml"

def save_api_yaml(config_data):
    with open(API_YAML_PATH, "w", encoding="utf-8") as f:
        yaml.dump(config_data, f)

def update_config(config_data, use_config_url=False):
    for index, provider in enumerate(config_data['providers']):
        if provider.get('project_id'):
            provider['base_url'] = 'https://aiplatform.googleapis.com/'
        if provider.get('cf_account_id'):
            provider['base_url'] = 'https://api.cloudflare.com/'

        provider_api = provider.get('api', None)
        if provider_api:
            if isinstance(provider_api, str):
                provider_api_circular_list[provider['provider']] = ThreadSafeCircularList([provider_api])
            if isinstance(provider_api, list):
                provider_api_circular_list[provider['provider']] = ThreadSafeCircularList(provider_api)

        if not provider.get("model"):
            model_list = update_initial_model(provider['base_url'], provider['api'])
            if model_list:
                provider["model"] = model_list
                if not use_config_url:
                    save_api_yaml(config_data)

        if provider.get("tools") == None:
            provider["tools"] = True

        config_data['providers'][index] = provider

    api_keys_db = config_data['api_keys']

    for index, api_key in enumerate(config_data['api_keys']):
        weights_dict = {}
        models = []
        if api_key.get('model'):
            for model in api_key.get('model'):
                if isinstance(model, dict):
                    key, value = list(model.items())[0]
                    # provider_name = key.split("/")[0]
                    if "/" in key:
                        weights_dict.update({key: int(value)})
                    models.append(key)
                if isinstance(model, str):
                    models.append(model)
            if weights_dict:
                config_data['api_keys'][index]['weights'] = weights_dict
            config_data['api_keys'][index]['model'] = models
            api_keys_db[index]['model'] = models
        else:
            # Default to all models if 'model' field is not set
            config_data['api_keys'][index]['model'] = ["all"]
            api_keys_db[index]['model'] = ["all"]

    api_list = [item["api"] for item in api_keys_db]
    # logger.info(json.dumps(config_data, indent=4, ensure_ascii=False))
    return config_data, api_keys_db, api_list

# 读取YAML配置文件
async def load_config(app=None):

    if app and not hasattr(app.state, 'client'):
        import os
        TIMEOUT = float(os.getenv("TIMEOUT", 100))
        timeout = httpx.Timeout(connect=15.0, read=TIMEOUT, write=30.0, pool=30.0)
        default_headers = {
            "User-Agent": "curl/7.68.0",  # 模拟 curl 的 User-Agent
            "Accept": "*/*",  # curl 的默认 Accept 头
        }
        app.state.client = httpx.AsyncClient(
            timeout=timeout,
            headers=default_headers,
            http2=True,  # 禁用 HTTP/2
            verify=True,  # 保持 SSL 验证（如需禁用，设为 False，但不建议）
            follow_redirects=True,  # 自动跟随重定向
        )

    try:
        with open(API_YAML_PATH, 'r', encoding='utf-8') as file:
            conf = yaml.load(file)

        if conf:
            config, api_keys_db, api_list = update_config(conf, use_config_url=False)
        else:
            logger.error("配置文件 'api.yaml' 为空。请检查文件内容。")
            config, api_keys_db, api_list = {}, {}, []
    except FileNotFoundError:
        logger.error("'api.yaml' not found. Please check the file path.")
        config, api_keys_db, api_list = {}, {}, []
    except YAMLError as e:
        logger.error("配置文件 'api.yaml' 格式不正确。请检查 YAML 格式。%s", e)
        config, api_keys_db, api_list = {}, {}, []
    except OSError as e:
        logger.error(f"open 'api.yaml' failed: {e}")
        config, api_keys_db, api_list = {}, {}, []

    if config != {}:
        return config, api_keys_db, api_list

    import os
    # 新增： 从环境变量获取配置URL并拉取配置
    config_url = os.environ.get('CONFIG_URL')
    if config_url:
        try:
            response = await app.state.client.get(config_url)
            # logger.info(f"Fetching config from {response.text}")
            response.raise_for_status()
            config_data = yaml.load(response.text)
            # 更新配置
            # logger.info(config_data)
            if config_data:
                config, api_keys_db, api_list = update_config(config_data, use_config_url=True)
            else:
                logger.error(f"Error fetching or parsing config from {config_url}")
                config, api_keys_db, api_list = {}, {}, []
        except Exception as e:
            logger.error(f"Error fetching or parsing config from {config_url}: {str(e)}")
            config, api_keys_db, api_list = {}, {}, []
    return config, api_keys_db, api_list

def ensure_string(item):
    if isinstance(item, (bytes, bytearray)):
        return item.decode("utf-8")
    elif isinstance(item, str):
        return item
    elif isinstance(item, dict):
        return f"data: {json.dumps(item)}\n\n"
    else:
        return str(item)

import asyncio
import time as time_module
async def error_handling_wrapper(generator):
    start_time = time_module.time()
    try:
        first_item = await generator.__anext__()
        first_response_time = time_module.time() - start_time
        first_item_str = first_item
        # logger.info("first_item_str: %s", first_item_str)
        if isinstance(first_item_str, (bytes, bytearray)):
            first_item_str = first_item_str.decode("utf-8")
        if isinstance(first_item_str, str):
            if first_item_str.startswith("data:"):
                first_item_str = first_item_str.lstrip("data: ")
            if first_item_str.startswith("[DONE]"):
                logger.error("error_handling_wrapper [DONE]!")
                raise StopAsyncIteration
            if "The bot's usage is covered by the developer" in first_item_str:
                logger.error("error const string: %s", first_item_str)
                raise StopAsyncIteration
            if "process this request due to overload or policy" in first_item_str:
                logger.error("error const string: %s", first_item_str)
                raise StopAsyncIteration
            try:
                first_item_str = json.loads(first_item_str)
            except json.JSONDecodeError:
                logger.error("error_handling_wrapper JSONDecodeError!" + repr(first_item_str))
                raise StopAsyncIteration
        if isinstance(first_item_str, dict) and 'error' in first_item_str:
            # 如果第一个 yield 的项是错误信息，抛出 HTTPException
            status_code = first_item_str.get('status_code', 500)
            detail = first_item_str.get('details', f"{first_item_str}")
            raise HTTPException(status_code=status_code, detail=f"{detail}"[:300])

        # 如果不是错误，创建一个新的生成器，首先yield第一个项，然后yield剩余的项
        async def new_generator():
            yield ensure_string(first_item)
            try:
                async for item in generator:
                    yield ensure_string(item)
            except (httpx.ReadError, asyncio.CancelledError, httpx.RemoteProtocolError) as e:
                logger.error(f"Network error in new_generator: {e}")
                raise

        return new_generator(), first_response_time

    except StopAsyncIteration:
        raise HTTPException(status_code=400, detail="data: {'error': 'No data returned'}")

def post_all_models(token, config, api_list):
    all_models = []
    unique_models = set()

    if token not in api_list:
        raise HTTPException(status_code=403, detail="Invalid or missing API Key")
    api_index = api_list.index(token)
    if config['api_keys'][api_index]['model']:
        for model in config['api_keys'][api_index]['model']:
            if model == "all":
                # 如果模型名为 all，则返回所有模型
                all_models = get_all_models(config)
                return all_models
            if "/" in model:
                provider = model.split("/")[0]
                model = model.split("/")[1]
                if model == "*":
                    for provider_item in config["providers"]:
                        if provider_item['provider'] != provider:
                            continue
                        model_dict = get_model_dict(provider_item)
                        for model_item in model_dict.keys():
                            if model_item not in unique_models:
                                unique_models.add(model_item)
                                model_info = {
                                    "id": model_item,
                                    "object": "model",
                                    "created": 1720524448858,
                                    "owned_by": "uni-api"
                                    # "owned_by": provider_item['provider']
                                }
                                all_models.append(model_info)
                else:
                    for provider_item in config["providers"]:
                        if provider_item['provider'] != provider:
                            continue
                        model_dict = get_model_dict(provider_item)
                        for model_item in model_dict.keys() :
                            if model_item not in unique_models and model_item == model:
                                unique_models.add(model_item)
                                model_info = {
                                    "id": model_item,
                                    "object": "model",
                                    "created": 1720524448858,
                                    "owned_by": "uni-api"
                                }
                                all_models.append(model_info)
                continue

            if model not in unique_models:
                unique_models.add(model)
                model_info = {
                    "id": model,
                    "object": "model",
                    "created": 1720524448858,
                    "owned_by": model
                }
                all_models.append(model_info)

    return all_models

def get_all_models(config):
    all_models = []
    unique_models = set()

    for provider in config["providers"]:
        model_dict = get_model_dict(provider)
        for model in model_dict.keys():
            if model not in unique_models:
                unique_models.add(model)
                model_info = {
                    "id": model,
                    "object": "model",
                    "created": 1720524448858,
                    "owned_by": "uni-api"
                }
                all_models.append(model_info)

    return all_models

# 【GCP-Vertex AI 目前有這些區域可用】 https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/use-claude?hl=zh_cn
# c3.5s
# us-east5
# europe-west1

# c3s
# us-east5
# us-central1
# asia-southeast1

# c3o
# us-east5

# c3h
# us-east5
# us-central1
# europe-west1
# europe-west4


c35s = ThreadSafeCircularList(["us-east5", "europe-west1"])
c3s = ThreadSafeCircularList(["us-east5", "us-central1", "asia-southeast1"])
c3o = ThreadSafeCircularList(["us-east5"])
c3h = ThreadSafeCircularList(["us-east5", "us-central1", "europe-west1", "europe-west4"])
gem = ThreadSafeCircularList(["us-central1", "us-east4", "us-west1", "us-west4", "europe-west1", "europe-west2"])

class BaseAPI:
    def __init__(
        self,
        api_url: str = "https://api.openai.com/v1/chat/completions",
    ):
        if api_url == "":
            api_url = "https://api.openai.com/v1/chat/completions"
        self.source_api_url: str = api_url
        from urllib.parse import urlparse, urlunparse
        parsed_url = urlparse(self.source_api_url)
        if parsed_url.scheme == "":
            raise Exception("Error: API_URL is not set")
        if parsed_url.path != '/':
            before_v1 = parsed_url.path.split("/v1")[0]
        else:
            before_v1 = ""
        self.base_url: str = urlunparse(parsed_url[:2] + (before_v1,) + ("",) * 3)
        self.v1_url: str = urlunparse(parsed_url[:2]+ (before_v1 + "/v1",) + ("",) * 3)
        self.v1_models: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/models",) + ("",) * 3)
        if parsed_url.netloc == "api.deepseek.com":
            self.chat_url: str = urlunparse(parsed_url[:2] + ("/chat/completions",) + ("",) * 3)
        else:
            self.chat_url: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/chat/completions",) + ("",) * 3)
        self.image_url: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/images/generations",) + ("",) * 3)
        self.audio_transcriptions: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/audio/transcriptions",) + ("",) * 3)
        self.moderations: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/moderations",) + ("",) * 3)
        self.embeddings: str = urlunparse(parsed_url[:2] + (before_v1 + "/v1/embeddings",) + ("",) * 3)

def safe_get(data, *keys, default=None):
    for key in keys:
        try:
            data = data[key] if isinstance(data, (dict, list)) else data.get(key)
        except (KeyError, IndexError, AttributeError, TypeError):
            return default
    return data