make volume route always available (fixed)

app.py

@@ -15,6 +15,8 @@ music_path = Path(os.environ.get("MUSIC_PATH", "./music"))
 mpv_process: subprocess.Popen | None = None
 app = Flask(__name__)
 
+volume: float = 50
+
 
 def cleanup_unclean():
     if mpv_pidfile.is_file():
@@ -49,6 +51,7 @@ def playback_start():
             "--shuffle",
             str(music_path),
             "--no-video",
+            f"--volume={volume}",
         ],
         stdout=subprocess.DEVNULL,
         stderr=subprocess.DEVNULL,
@@ -232,26 +235,21 @@ def api_isengard():
 
 @app.route("/api/volume", methods=["GET", "PUT"])
 def api_volume():
-    if not is_playing():
-        return jsonify("not playing"), 400
+    if request.method == "PUT":
+        global volume
+        try:
+            volume = float(request.get_data().decode())
+            if not 0 <= volume <= 100:
+                raise ValueError()
+        except Exception:
+            return jsonify("bad volume"), 400
 
     sock = mpv_socket_open()
     if sock is not None:
-        if request.method == "PUT":
-            volume = request.get_data().decode()
-            mpv_socket_command(sock, {"command": ["set", "volume", volume]})
-            return jsonify("ok")
-
-        else:
-            reply_json = mpv_socket_command(
-                sock, {"command": ["get_property", "volume"]}
-            )
-            if "data" in reply_json:
-                return jsonify(float(reply_json["data"]))
-
+        mpv_socket_command(sock, {"command": ["set", "volume", volume]})
         sock.close()
 
-    return jsonify("unknown error"), 500
+    return jsonify(volume)
 
 
 signal.signal(signal.SIGTERM, sigh)