dify/api/core/__init__.py

import os
from typing import Optional

import langchain
from flask import Flask
from langchain.prompts.base import DEFAULT_FORMATTER_MAPPING
from pydantic import BaseModel

from core.callback_handler.std_out_callback_handler import DifyStdOutCallbackHandler
from core.prompt.prompt_template import OneLineFormatter


class HostedOpenAICredential(BaseModel):
    api_key: str


class HostedLLMCredentials(BaseModel):
    openai: Optional[HostedOpenAICredential] = None


hosted_llm_credentials = HostedLLMCredentials()


def init_app(app: Flask):
    formatter = OneLineFormatter()
    DEFAULT_FORMATTER_MAPPING['f-string'] = formatter.format

    if os.environ.get("DEBUG") and os.environ.get("DEBUG").lower() == 'true':
        langchain.verbose = True

    if app.config.get("OPENAI_API_KEY"):
        hosted_llm_credentials.openai = HostedOpenAICredential(api_key=app.config.get("OPENAI_API_KEY"))