add /api/volume

app.py

@@ -1,5 +1,5 @@
 from typing import Any, Mapping
-from flask import Flask, render_template, send_file, jsonify
+from flask import Flask, render_template, request, send_file, jsonify
 import os
 import subprocess
 import signal
@@ -228,6 +228,30 @@ def api_isengard():
     )
 
 
+@app.route("/api/volume", methods=["GET", "PUT"])
+def api_volume():
+    if not is_playing():
+        return jsonify("not playing"), 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"]))
+
+        sock.close()
+
+    return jsonify("unknown error"), 500
+
+
 signal.signal(signal.SIGTERM, sigh)
 signal.signal(signal.SIGINT, sigh)
 cleanup_unclean()