config.py

from pydantic_settings import (
    BaseSettings,
    PydanticBaseSettingsSource,
    SettingsConfigDict,
    PyprojectTomlConfigSettingsSource,
)
from typing import Tuple, Type


class Settings(BaseSettings):
    @classmethod
    def settings_customise_sources(
        cls,
        settings_cls: Type[BaseSettings],
        init_settings: PydanticBaseSettingsSource,
        env_settings: PydanticBaseSettingsSource,
        dotenv_settings: PydanticBaseSettingsSource,
        file_secret_settings: PydanticBaseSettingsSource,
    ) -> Tuple[PydanticBaseSettingsSource, ...]:
        return (
            init_settings,
            PyprojectTomlConfigSettingsSource(settings_cls),
            env_settings,
            dotenv_settings,
            file_secret_settings,
        )


class AppSettings(Settings): 
    # backend
    llm_model: str
    llm_region: str
    model_provider: str
    embedding_model: str
    embedding_size: int
    vector_db_url: str
    vector_db_collection_name: str

    # secrets
    aws_access_key_id: str
    aws_secret_access_key: str
    langfuse_public_api_key: str
    langfuse_secret_api_key: str
    langfuse_host: str
    test_user_name: str
    test_user_password: str

    model_config = SettingsConfigDict(
        pyproject_toml_table_header=("tool", "app_config"),
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

app_settings = AppSettings()