feat: Continuously poll playlists and execute command on song count change

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -2,6 +2,8 @@ import os, logging
 import hashlib
 import random
 import string
+import subprocess
+import time
 
 import requests
 DEBUG = os.environ.get('DEBUG')
@@ -40,6 +42,9 @@ def main():
         'f': 'json'
     }
 
+    playlist_song_counts = {}
+
+    while True:
         api_url = f"{navidrome_url.rstrip('/')}/rest/getPlaylists.view"
 
         try:
@@ -47,29 +52,57 @@ def main():
             response.raise_for_status()  # Raise an exception for bad status codes
         except requests.exceptions.RequestException as e:
             logging.error(f"Error connecting to Navidrome: {e}")
-        return
+            time.sleep(5)
+            continue
 
         data = response.json()
 
         subsonic_response = data.get('subsonic-response')
         if not subsonic_response:
             logging.error("Invalid response format from server.")
-        return
+            time.sleep(5)
+            continue
 
         if subsonic_response.get('status') == 'failed':
             error = subsonic_response.get('error', {})
             logging.error(f"API Error: {error.get('message')} (code: {error.get('code')})")
-        return
+            time.sleep(5)
+            continue
 
         playlists = subsonic_response.get('playlists', {}).get('playlist', [])
         
-    if not playlists:
-        logging.info("No playlists found for user '%s'.", username)
-        return
+        current_playlists = {p.get('id'): p for p in playlists}
 
+        # On the first successful poll, print the list of playlists and populate the counts
+        if not playlist_song_counts and playlists:
+            logging.info("Initial scan. Monitoring playlists for changes.")
             print(f"Playlists for {username}:")
-    for playlist in playlists:
-        print(f"  - [{playlist.get('id')}] {playlist.get('name')} ({playlist.get('songCount')} songs)")
+            for playlist_id, playlist_data in current_playlists.items():
+                print(f"  - [{playlist_id}] {playlist_data.get('name')} ({playlist_data.get('songCount')} songs)")
+        
+        # Check for song count changes in playlists we are already tracking
+        for playlist_id, playlist_data in current_playlists.items():
+            current_song_count = playlist_data.get('songCount')
+            if playlist_id in playlist_song_counts and playlist_song_counts[playlist_id] != current_song_count:
+                logging.info(f"Song count changed for '{playlist_data.get('name')}' ({playlist_id}): {playlist_song_counts[playlist_id]} -> {current_song_count}. Running command.")
+                
+                cmd = ['docker', 'exec', 'navidrome-navidrome-1', '/app/navidrome', 'pls', '-l', 'error', '-np', playlist_id]
+                try:
+                    result = subprocess.run(cmd, capture_output=True, text=True, check=False)
+                    print(f"\n--- Output for playlist '{playlist_data.get('name')}' ---")
+                    if result.stdout.strip():
+                        print(result.stdout.strip())
+                    if result.stderr.strip():
+                        print("STDERR:")
+                        print(result.stderr.strip())
+                    print("--- End output ---\n")
+                except FileNotFoundError:
+                    logging.error("Command 'docker' not found. Please ensure it is installed and in your PATH.")
+
+        # Update the state for the next iteration. This handles new, deleted, and updated playlists.
+        playlist_song_counts = {pid: pdata.get('songCount') for pid, pdata in current_playlists.items()}
+
+        time.sleep(5)
 
 
 if __name__ == "__main__":