overhauled checking of JSON database/folders with myriad of existence/error checking/data clearing measures. Pre-overhaul to SQLAlchemy based database system.

app/sound.py

@@ -1,10 +1,12 @@
 from app import app
 from flask import send_file, redirect, url_for, render_template
+from multiprocessing import Value
 from mutagen.mp3 import MP3
 import os
 import re
 import json
 import subprocess
+import shutil
 
 # Services => Expected Data
 # YouTube => Video ID
@@ -16,6 +18,12 @@ import subprocess
 # https://soundcloud.com/yungraredeath/fall-in-line-w-kxng-prod-mars-mission => /stream/soundcloud/fall-in-line-w-kxng-prod-mars-mission---yungraredeath => soundcloud/fall-in-line-w-kxng-prod-mars-mission---yungraredeath.mp3
 # spotify:track:16PmczUxlX7dpr6ror6pXd => /duration/spotify/16PmczUxlX7dpr6ror6pXd => spotify/16PmczUxlX7dpr6ror6pXd.mp3
 
+class SoundcloudHandler:
+    pass
+
+class SpotifyHandler:
+    pass
+
 class YouTubeHandler:
     @staticmethod
     def url(videoid):
@@ -68,30 +76,55 @@ class YouTubeHandler:
 
 service_functions = {
     'youtube' : YouTubeHandler,
-    'spotify' : {'url' : None, 'path' : None},
-    'soundcloud' : {'url' : None, 'path' : None}
+    'spotify' : SpotifyHandler,
+    'soundcloud' : SoundcloudHandler
 }
 
+# Default JSON format, will be used in case of corruption
+JSONDefault = {'youtube' : {}, 'soundcloud' : {}, 'spotify' : {}}
+
+
 if not os.path.exists(os.path.join('app', 'sounds')):
+    print('Sounds folder not found. Creating.')
     os.mkdir(os.path.join('app', 'sounds'))
 
+# Test JSON file existence
 if not os.path.exists(os.path.join('app', 'sounds', 'filenames.json')):
+    print('JSON database file not found. Creating with default data structure.')
     with open(os.path.join('app', 'sounds', 'filenames.json'), 'w+') as file:
         json.dump({'youtube' : {} }, file)
+else:
+    # File exists, but is it valid JSON?
+    try:
+        print('Testing JSON database file.')
+        with open(os.path.join('app', 'sounds', 'filenames.json'), 'r') as file:
+            json.load(file)
+    except json.JSONDecodeError:
+        # Corruption or other has occurred. Clearing all service folders. Resetting and clearing all services
+        print('Corruption/Invalid formatting in JSON file detected, clearing all config/media.')
+        print('Clearing JSON database file.')
+        with open(os.path.join('app', 'sounds', 'filenames.json'), 'w+') as file:
+            json.dump(JSONDefault, file)
+
+        for service in service_functions.keys():
+            print(f"Clearing '{service}' folder.")
+            servicePath = os.path.join('app', 'sounds', service)
+            if os.path.exists(servicePath):
+                shutil.rmtree(servicePath)
+                os.mkdir(servicePath)
+            else:
+                os.mkdir(servicePath)
 
 # Streams a prepared MP3 back to the client
 @app.route('/stream/<service>/<mediaid>')
 def stream(service, mediaid):
     prepare(service, mediaid)
-    if service == 'youtube':
-        config = YouTubeHandler.getConfig(mediaid)
-        return send_file(os.path.join(os.path.dirname(__file__), '..', config['path']), attachment_filename=config['filename'])
-    return '???'
+    config = service_functions[service].getConfig(mediaid)
+    return send_file(os.path.join(os.path.dirname(__file__), '..', config['path']), attachment_filename=config['filename'])
     
 # Prepares a URL for download, returning the duration it should play for if streamed
 @app.route('/prepare/<service>/<mediaid>')
 def prepare(service, mediaid):
     filepath = service_functions[service].path(mediaid)
     service_functions[service].download(mediaid)
-    print(filepath)
     return str(MP3(filepath).info.length)