app.py

from generate_prompts import generate_prompt
import gradio as gr
from diffusers import AutoPipelineForText2Image
from io import BytesIO
import asyncio

# Load the model once outside of the function
model = AutoPipelineForText2Image.from_pretrained("stabilityai/sdxl-turbo")

async def generate_image(prompt, prompt_name):
    try:
        print(f"Generating image for {prompt_name}")
        output = await asyncio.to_thread(model, prompt=prompt, num_inference_steps=1, guidance_scale=0.0)

        # Check if the model returned images
        if isinstance(output.images, list) and len(output.images) > 0:
            image = output.images[0]
            buffered = BytesIO()
            try:
                image.save(buffered, format="JPEG")
                image_bytes = buffered.getvalue()
                print(f"Image bytes length for {prompt_name}: {len(image_bytes)}")
                return image_bytes
            except Exception as e:
                print(f"Error saving image for {prompt_name}: {e}")
                return None
        else:
            raise Exception(f"No images returned by the model for {prompt_name}.")
    except Exception as e:
        print(f"Error generating image for {prompt_name}: {e}")
        return None

async def process_prompt(sentence_mapping, character_dict, selected_style):
    images = {}
    print(f'sentence_mapping: {sentence_mapping}, character_dict: {character_dict}, selected_style: {selected_style}')
    prompts = []

    # Generate prompts for each paragraph
    for paragraph_number, sentences in sentence_mapping.items():
        combined_sentence = " ".join(sentences)
        prompt = generate_prompt(combined_sentence, character_dict, selected_style)
        prompts.append((paragraph_number, prompt))
        print(f"Generated prompt for paragraph {paragraph_number}: {prompt}")

    # Create tasks for all prompts and run them concurrently
    tasks = [generate_image(prompt, f"Prompt {paragraph_number}") for paragraph_number, prompt in prompts]
    results = await asyncio.gather(*tasks)

    # Map results back to paragraphs
    for i, (paragraph_number, _) in enumerate(prompts):
        if i < len(results):
            images[paragraph_number] = results[i]
        else:
            print(f"Error: No result for paragraph {paragraph_number}")

    return images

# Helper function to generate a prompt based on the input
def generate_prompt(combined_sentence, character_dict, selected_style):
    characters = " ".join([" ".join(character) if isinstance(character, list) else character for character in character_dict.values()])
    return f"Make an illustration in {selected_style} style from: {characters}. {combined_sentence}"

# Gradio interface with high concurrency limit
gradio_interface = gr.Interface(
    fn=process_prompt,
    inputs=[
        gr.JSON(label="Sentence Mapping"),
        gr.JSON(label="Character Dict"),
        gr.Dropdown(["oil painting", "sketch", "watercolor"], label="Selected Style")
    ],
    outputs="json",
    concurrency_limit=20  # Set a high concurrency limit
).queue(default_concurrency_limit=20)

if __name__ == "__main__":
    gradio_interface.launch()