moved models into separate sound_models, started creating basic metadata filler functions

app/sound_models.py

@@ -0,0 +1,40 @@
+from datetime import datetime
+from app import db
+import subprocess
+import json
+import os
+
+class YouTubeAudio(db.Model):
+    id = db.Column(db.String(11), primary_key=True) # 11 char id, presumed to stay the same for the long haul. Should be able to change to 12 chars.
+    url = db.Column(db.String(64)) # 43 -> 64
+    title = db.Column(db.String(128)) # 120 > 128
+    creator = db.Column(db.String(128)) # Seems to be Uploader set, so be careful with this
+    uploader = db.Column(db.String(32)) # 20 -> 32
+    filename = db.Column(db.String(156)) # 128 + 11 + 1 -> 156 
+    duration = db.Column(db.Integer) 
+    download_timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
+    last_access_timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
+
+    def file_exists(self):
+        return os.path.exists(os.path.join('app', 'sounds', 'youtube', self.filename))
+
+    def fill_metadata(self):
+        self.url = f'https://www.youtube.com/watch?v={self.id}'
+        processFilename = subprocess.Popen(['youtube-dl', '-x', '--audio-format', 'mp3', '--restrict-filenames', '--get-filename', self.url],
+                encoding='utf-8', stdout=subprocess.PIPE)
+        self.filename = processFilename.communicate()[0].split('.')[0] + 'mp3'
+        processJSON = subprocess.Popen(['youtube-dl', '-x', '--audio-format', 'mp3', '--restrict-filenames', '--dump-json', self.url],
+                encoding='utf-8', stdout=subprocess.PIPE)
+        data = json.loads(processJSON.communicate()[0])
+        self.duration = data['duration']
+        self.creator = data['creator'] or data['uploader']
+        self.uploader = data['uploader'] or data['creator']
+        self.title = data['title'] or data['alt_title'] # Do not trust alt-title ; it is volatile and uploader set, e.x. https://i.imgur.com/Tgff4rI.png
+
+class SoundcloudAudio(db.Model):
+    id = db.Column(db.Integer, primary_key=True) # hidden API-accessible only ID
+    url = db.Column(db.String(256))
+    title = db.Column(db.String(128))
+    creator = db.Column(db.String(64))
+    filename = db.Column(db.String(156))
+    duration = db.Column(db.Integer)