server.py

from flask import (
    Flask,
    jsonify,
    request,
    render_template_string,
    abort,
)
from flask_cors import CORS
import unicodedata
import markdown
import time
import os
import gc
import base64
from io import BytesIO
from random import randint
import hashlib
from colorama import Fore, Style, init as colorama_init
import chromadb
import posthog
from chromadb.config import Settings
from sentence_transformers import SentenceTransformer
from werkzeug.middleware.proxy_fix import ProxyFix

colorama_init()

port = 7860
host = "0.0.0.0"

embedding_model = 'sentence-transformers/all-mpnet-base-v2'

print("Initializing ChromaDB")

# disable chromadb telemetry
posthog.capture = lambda *args, **kwargs: None
chromadb_client = chromadb.Client(Settings(anonymized_telemetry=False))
chromadb_embedder = SentenceTransformer(embedding_model)
chromadb_embed_fn = chromadb_embedder.encode

# Flask init
app = Flask(__name__)
CORS(app)  # allow cross-domain requests
app.config["MAX_CONTENT_LENGTH"] = 100 * 1024 * 1024

app.wsgi_app = ProxyFix(
    app.wsgi_app, x_for=2, x_proto=1, x_host=1, x_prefix=1
)

def get_real_ip():
    return request.remote_addr

@app.route("/", methods=["GET"])
def index():
    with open("./README.md", "r", encoding="utf8") as f:
        content = f.read()
    return render_template_string(markdown.markdown(content, extensions=["tables"]))


@app.route("/api/modules", methods=["GET"])
def get_modules():
    return jsonify({"modules": ['chromadb']})

@app.route("/api/chromadb", methods=["POST"])
def chromadb_add_messages():
    data = request.get_json()
    if "chat_id" not in data or not isinstance(data["chat_id"], str):
        abort(400, '"chat_id" is required')
    if "messages" not in data or not isinstance(data["messages"], list):
        abort(400, '"messages" is required')

    ip = get_real_ip()
    chat_id_md5 = hashlib.md5(f'{ip}-{data["chat_id"]}'.encode()).hexdigest()
    collection = chromadb_client.get_or_create_collection(
        name=f"chat-{chat_id_md5}", embedding_function=chromadb_embed_fn
    )

    documents = [m["content"] for m in data["messages"]]
    ids = [m["id"] for m in data["messages"]]
    metadatas = [
        {"role": m["role"], "date": m["date"], "meta": m.get("meta", "")}
        for m in data["messages"]
    ]

    if len(ids) > 0:
        collection.upsert(
            ids=ids,
            documents=documents,
            metadatas=metadatas,
        )

    return jsonify({"count": len(ids)})


@app.route("/api/chromadb/query", methods=["POST"])
def chromadb_query():
    data = request.get_json()
    if "chat_id" not in data or not isinstance(data["chat_id"], str):
        abort(400, '"chat_id" is required')
    if "query" not in data or not isinstance(data["query"], str):
        abort(400, '"query" is required')

    if "n_results" not in data or not isinstance(data["n_results"], int):
        n_results = 1
    else:
        n_results = data["n_results"]

    ip = get_real_ip()
    chat_id_md5 = hashlib.md5(f'{ip}-{data["chat_id"]}'.encode()).hexdigest()
    collection = chromadb_client.get_or_create_collection(
        name=f"chat-{chat_id_md5}", embedding_function=chromadb_embed_fn
    )

    n_results = min(collection.count(), n_results)

    messages = []
    if n_results > 0:
        query_result = collection.query(
            query_texts=[data["query"]],
            n_results=n_results,
        )
    
        documents = query_result["documents"][0]
        ids = query_result["ids"][0]
        metadatas = query_result["metadatas"][0]
        distances = query_result["distances"][0]
    
        messages = [
            {
                "id": ids[i],
                "date": metadatas[i]["date"],
                "role": metadatas[i]["role"],
                "meta": metadatas[i]["meta"],
                "content": documents[i],
                "distance": distances[i],
            }
            for i in range(len(ids))
        ]

    return jsonify(messages)
    
@app.route("/api/chromadb/purge", methods=["POST"])
def chromadb_purge():
    data = request.get_json()
    if "chat_id" not in data or not isinstance(data["chat_id"], str):
        abort(400, '"chat_id" is required')

    ip = get_real_ip()
    chat_id_md5 = hashlib.md5(f'{ip}-{data["chat_id"]}'.encode()).hexdigest()
    collection = chromadb_client.get_or_create_collection(
        name=f"chat-{chat_id_md5}", embedding_function=chromadb_embed_fn
    )

    deleted = collection.delete()
    print("ChromaDB embeddings deleted", len(deleted))

    return 'Ok', 200
app.run(host=host, port=port)