WebSlider/slider.py

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#!/usr/bin/python3
from flask import Flask, render_template, send_from_directory, redirect, url_for
from random import choice
from pathlib import Path
from PIL import Image
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from time import time
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from hashlib import sha256
import click
from shutil import rmtree
import config
app = Flask(__name__)
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imgdir = Path(config.imgdir).expanduser().resolve()
cache_resolution = config.resolution
cache_dir = Path(config.cachedir) / ("%sx%s" % cache_resolution)
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@app.route("/")
def random():
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return render_template("random.html", refresh=config.refresh)
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@app.route("/random_image/")
def random_image():
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img_glob = "*jpg"
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last_modified_time, last_modified_file = max(
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(f.stat().st_mtime, f) for f in imgdir.glob(img_glob)
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)
if time() - last_modified_time <= 60:
selected_image = last_modified_file.relative_to(imgdir)
else:
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images = list(imgdir.glob(img_glob))
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selected_image = choice(images).relative_to(imgdir)
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return redirect(url_for("image", filename=selected_image))
@app.route("/img/<path:filename>")
def image(filename):
cache_filename = create_cache_file(filename)
return send_from_directory(cache_dir, cache_filename)
def rm_cachedir():
if Path(config.cachedir).exists():
print("Removing cache dir", config.cachedir)
rmtree(config.cachedir)
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def create_cachedir():
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if not cache_dir.exists():
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print("Creating cache dir", cache_dir)
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cache_dir.mkdir(parents=True)
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def create_cache_file(filename):
create_cachedir()
cache_file = get_cache_filename(filename)
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if not (cache_dir / cache_file).exists():
print("Creating cache file", filename)
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img = Image.open(imgdir / filename)
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img.thumbnail(cache_resolution)
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img.save(cache_dir / cache_file, "JPEG")
return cache_file
def get_cache_filename(filename):
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original_file_path = imgdir / filename
return sha256(str(original_file_path.resolve()).encode("utf-8")).hexdigest()
def pre_cache_images():
for image_file in sorted(imgdir.glob("*.jpg")):
create_cache_file(image_file.relative_to(imgdir))
@click.command()
@click.option("--build-cache", is_flag=True, default=False, help="pre-cache images")
@click.option(
"--clear-cache", is_flag=True, default=False, help="clear cache directory"
)
def run_slider(build_cache, clear_cache):
if clear_cache:
rm_cachedir()
if build_cache:
pre_cache_images()
app.run()
if __name__ == "__main__":
run_slider()