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122 lines
3.5 KiB
Python
122 lines
3.5 KiB
Python
import os
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import pickle
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import dotenv
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import datetime
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from flask import Flask, request, render_template
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# os.environ["LANGCHAIN_HANDLER"] = "langchain"
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import faiss
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from langchain import OpenAI
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from langchain.chains import VectorDBQAWithSourcesChain
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from langchain.prompts import PromptTemplate
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import requests
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# Redirect PosixPath to WindowsPath on Windows
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import platform
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if platform.system() == "Windows":
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import pathlib
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temp = pathlib.PosixPath
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pathlib.PosixPath = pathlib.WindowsPath
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# loading the .env file
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dotenv.load_dotenv()
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with open("combine_prompt.txt", "r") as f:
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template = f.read()
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# check if OPENAI_API_KEY is set
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if os.getenv("OPENAI_API_KEY") is not None:
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api_key_set = True
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else:
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api_key_set = False
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app = Flask(__name__)
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@app.route("/")
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def home():
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return render_template("index.html", api_key_set=api_key_set)
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@app.route("/api/answer", methods=["POST"])
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def api_answer():
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data = request.get_json()
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question = data["question"]
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if not api_key_set:
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api_key = data["api_key"]
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else:
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api_key = os.getenv("OPENAI_API_KEY")
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# check if the vectorstore is set
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if "active_docs" in data:
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vectorstore = "vectors/" + data["active_docs"]
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if data['active_docs'] == "default":
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vectorstore = ""
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else:
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vectorstore = ""
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# loading the index and the store and the prompt template
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index = faiss.read_index(f"{vectorstore}docs.index")
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with open(f"{vectorstore}faiss_store.pkl", "rb") as f:
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store = pickle.load(f)
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store.index = index
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# create a prompt template
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c_prompt = PromptTemplate(input_variables=["summaries", "question"], template=template)
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# create a chain with the prompt template and the store
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chain = VectorDBQAWithSourcesChain.from_llm(llm=OpenAI(openai_api_key=api_key, temperature=0), vectorstore=store, combine_prompt=c_prompt)
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# fetch the answer
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result = chain({"question": question})
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# some formatting for the frontend
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result['answer'] = result['answer'].replace("\\n", "<br>")
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result['answer'] = result['answer'].replace("SOURCES:", "")
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# mock result
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# result = {
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# "answer": "The answer is 42",
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# "sources": ["https://en.wikipedia.org/wiki/42_(number)", "https://en.wikipedia.org/wiki/42_(number)"]
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# }
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return result
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@app.route("/api/docs_check", methods=["POST"])
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def check_docs():
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# check if docs exist in a vectorstore folder
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data = request.get_json()
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vectorstore = "vectors/" + data["docs"]
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base_path = 'https://raw.githubusercontent.com/arc53/DocsHUB/main/'
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#
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if os.path.exists(vectorstore):
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return {"status": 'exists'}
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else:
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r = requests.get(base_path + vectorstore + "docs.index")
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# save to vectors directory
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# check if the directory exists
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if not os.path.exists(vectorstore):
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os.makedirs(vectorstore)
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with open(vectorstore + "docs.index", "wb") as f:
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f.write(r.content)
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# download the store
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r = requests.get(base_path + vectorstore + "faiss_store.pkl")
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with open(vectorstore + "faiss_store.pkl", "wb") as f:
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f.write(r.content)
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return {"status": 'loaded'}
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# handling CORS
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@app.after_request
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def after_request(response):
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response.headers.add('Access-Control-Allow-Origin', '*')
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response.headers.add('Access-Control-Allow-Headers', 'Content-Type,Authorization')
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response.headers.add('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS')
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return response
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if __name__ == "__main__":
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app.run(debug=True)
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