app.py

# import the necessary packages
import os
import sys
import requests
import ssl
from flask import Flask
from flask import request
from flask import jsonify
from flask import send_file

from uuid import uuid4

from os import path
import torch

import fastai
from fasterai.visualize import *
from pathlib import Path
import traceback


torch.backends.cudnn.benchmark=True

image_colorizer = get_image_colorizer(artistic=True)
video_colorizer = get_video_colorizer()

os.environ['CUDA_VISIBLE_DEVICES']='0'

app = Flask(__name__)

# define a predict function as an endpoint

@app.route("/process_image", methods=["POST"])
def process_image():
    try:
        source_url = request.json["source_url"]
        render_factor = int(request.json["render_factor"])

        upload_directory = 'upload'
        if not os.path.exists(upload_directory):
            os.mkdir(upload_directory)

        random_filename = str(uuid4()) + '.png'
    
        image_colorizer.plot_transformed_image_from_url(url=source_url, path=os.path.join(upload_directory, random_filename), figsize=(20,20),
            render_factor=render_factor, display_render_factor=True, compare=False)

        callback = send_file(os.path.join("result_images", random_filename), mimetype='image/jpeg')
        
        return callback

    except:
        traceback.print_exc()
        return {message: 'input error'}, 400

    finally:
        os.remove(os.path.join("result_images", random_filename))
        os.remove(os.path.join("upload", random_filename))


@app.route("/process_video", methods=["POST"])
def process_video():
    try:
        source_url = request.json["source_url"]
        render_factor = int(request.json["render_factor"])

        upload_directory = 'upload'
        if not os.path.exists(upload_directory):
            os.mkdir(upload_directory)

        random_filename = str(uuid4()) + '.mp4'

        video_path = video_colorizer.colorize_from_url(source_url, random_filename, render_factor)
        callback = send_file(os.path.join("video/result/", random_filename), mimetype='application/octet-stream')

        return callback

    except:
        traceback.print_exc()
        return {message: 'input error'}, 400

    finally:
        os.remove(os.path.join("video/result/", random_filename))

if __name__ == '__main__':
    port = 5000
    host = '0.0.0.0'
    app.run(host=host, port=port, threaded=True)