Add real download feature

Dockerfile

@@ -2,12 +2,13 @@ FROM python:slim
  
 # flask and app
 RUN pip install flask flask-wtf
-COPY /pytubedl/pytubedl.py /pytubedl.py
+COPY /pytubedl/ /pytubedl/
-COPY /pytubedl/templates /templates
+RUN chmod 755 /pytubedl/dl_wrapper.sh
 EXPOSE 5000
 
 # youtube-dl
 RUN pip install youtube_dl
 
+WORKDIR /pytubedl 
 CMD ["python", "pytubedl.py"]
 

pytubedl/dl_wrapper.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# wrapper around youtube-dl
+
+DOWNLOAD_DIR="/mnt/incoming/pytubedl/"
+
+usage(){
+	echo "$0 <url>"
+	exit 1
+}
+
+# check args
+if [ -z "$1" ]; then
+	usage
+fi
+url="$1"
+
+# check process
+pgrep youtube-dl
+ret=$?
+
+if [ ${ret} -eq 0 ]; then
+	echo "Another youtube-dl process is already running."
+	exit 2
+fi
+
+pushd ${PWD}
+cd "${DOWNLOAD_DIR}"
+youtube-dl -t "$url"
+popd

pytubedl/pytubedl.py

@@ -2,11 +2,14 @@ from flask import Flask, render_template, request, flash
 from wtforms import Form, StringField
 from wtforms.validators import DataRequired, URL
 import secrets
+import subprocess
+import time
 
 DEBUG = False
 app = Flask(__name__)
 app.config['SECRET_KEY'] = secrets.token_urlsafe(20)
 
+
 class MyForm(Form):
     url = StringField('url', validators=[DataRequired(), URL(message='Must be a valid URL')])
 
@@ -21,7 +24,22 @@ class MyForm(Form):
             print("URL: " + url)
 
             if form.validate():
-                flash('OK. Download in progress')
+                flash('OK. Starting download')
+                process = subprocess.Popen(['./dl_wrapper.sh', url],
+                                           stdout=subprocess.PIPE,
+                                           universal_newlines=True)
+                # sleep 2 seconds to catch errors
+                time.sleep(2)
+                return_code = process.poll()
+                if return_code and return_code != 0:
+                    # if process return early, there's good chance of an error
+                    error_msg = f"An error occurred. return code: {return_code}.\nlogs:\n{process.stdout}"
+                    flash(error_msg)
+
+                else:
+                    # process is running, probably no error (yet ;-) )
+                    flash('OK. Download in progress. File will appear in output dir')
+
             else:
                 flash('Error: bad URL')