app.py

import argparse
import base64
import os
from pathlib import Path
from io import BytesIO
import time

from flask import Flask, request, jsonify
from flask_cors import CORS, cross_origin
from consts import IMAGES_OUTPUT_DIR
from utils import parse_arg_boolean, parse_arg_dalle_version
from consts import ModelSize

app = Flask(__name__)
CORS(app)
print("--> Starting DALL-E Server. This might take up to two minutes.")

from dalle_model import DalleModel
dalle_model = None

parser = argparse.ArgumentParser(description = "A DALL-E app to turn your textual prompts into visionary delights")
parser.add_argument("--port", type=int, default=8000, help = "backend port")
parser.add_argument("--model_version", type = parse_arg_dalle_version, default = ModelSize.MINI, help = "Mini, Mega, or Mega_full")
parser.add_argument("--save_to_disk", type = parse_arg_boolean, default = False, help = "Should save generated images to disk")
args = parser.parse_args()

@app.route("/dalle", methods=["POST"])
@cross_origin()
def generate_images_api():
    json_data = request.get_json(force=True)
    text_prompt = json_data["text"]
    num_images = json_data["num_images"]
    generated_imgs = dalle_model.generate_images(text_prompt, num_images)

    generated_images = []
    if args.save_to_disk: 
        dir_name = os.path.join(IMAGES_OUTPUT_DIR,f"{time.strftime('%Y-%m-%d_%H:%M:%S')}_{text_prompt}")
        Path(dir_name).mkdir(parents=True, exist_ok=True)
    
    for idx, img in enumerate(generated_imgs):
        if args.save_to_disk: 
            img.save(os.path.join(dir_name, f'{idx}.jpeg'), format="JPEG")

        buffered = BytesIO()
        img.save(buffered, format="JPEG")
        img_str = base64.b64encode(buffered.getvalue()).decode("utf-8")
        generated_images.append(img_str)

    print(f"Created {num_images} images from text prompt [{text_prompt}]")
    return jsonify(generated_images)


@app.route("/", methods=["GET"])
@cross_origin()
def health_check():
    return jsonify(success=True)


with app.app_context():
    dalle_model = DalleModel(args.model_version)
    dalle_model.generate_images("warm-up", 1)
    print("--> DALL-E Server is up and running!")
    print(f"--> Model selected - DALL-E {args.model_version}")


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=args.port, debug=False)