app.py

import gradio as gr
import requests
import io
from PIL import Image
import json
import os
import logging

logging.basicConfig(level=logging.DEBUG)

with open('loras.json', 'r') as f:
    loras = json.load(f)

def update_selection(selected_state: gr.SelectData):
    logging.debug(f"Inside update_selection, selected_state: {selected_state}")
    selected_lora_index = selected_state.index  # Changed this line
    selected_lora = loras[selected_lora_index]
    new_placeholder = f"Type a prompt for {selected_lora['title']}"
    return (
        gr.update(placeholder=new_placeholder),
        selected_state
    )

def run_lora(prompt, selected_state, progress=gr.Progress(track_tqdm=True)):
    logging.debug(f"Inside run_lora, selected_state: {selected_state}")
    if not selected_state:
        logging.error("selected_state is None or empty.")
        raise gr.Error("You must select a LoRA")

    selected_lora_index = selected_state.index  # Changed this line
    selected_lora = loras[selected_lora_index]
    api_url = f"https://api-inference.huggingface.co/models/{selected_lora['repo']}"
    trigger_word = selected_lora["trigger_word"]
    token = os.getenv("API_TOKEN")
    payload = {"inputs": f"{prompt} {trigger_word}"}

    headers = {"Authorization": f"Bearer {token}"}
    response = requests.post(api_url, headers=headers, json=payload)
    if response.status_code == 200:
        return Image.open(io.BytesIO(response.content))
    else:
        logging.error(f"API Error: {response.status_code}")
        raise gr.Error("API Error: Unable to fetch the image.")  # Raise a Gradio error here


with gr.Blocks(css="custom.css") as app:
    title = gr.HTML("<h1>LoRA the Explorer</h1>")
    selected_state = gr.State()  
    with gr.Row():
        gallery = gr.Gallery(
            [(item["image"], item["title"]) for item in loras],
            label="LoRA Gallery",
            allow_preview=False,
            columns=3
        )
        with gr.Column():
            prompt_title = gr.Markdown("### Click on a LoRA in the gallery to select it")
            with gr.Row():
                prompt = gr.Textbox(label="Prompt", show_label=False, lines=1, max_lines=1, placeholder="Type a prompt after selecting a LoRA")
                button = gr.Button("Run")
            result = gr.Image(interactive=False, label="Generated Image")

    gallery.select(
        update_selection,
        outputs=[prompt, selected_state]
    )
    button.click(
        fn=run_lora,
        inputs=[prompt, selected_state],
        outputs=[result]
    )

app.queue(max_size=20)
app.launch()