Screen state does not work when tv is off #353
Description
I am trying to rewrite https://github.com/Faceless3882/LG_Buddy to use alga instead of https://github.com/chros73/bscpylgtv as i find alga easier to work with.
One of the things LG_Buddy does is check the state of the tv before sending a command ex: https://github.com/Faceless3882/LG_Buddy/blob/2df3c413eae7640d51226c23c64d193d357006e1/bin/LG_Buddy_Startup#L19
I saw #332 was merged and added a power screen-state option but unlike bscpylgtv eqivulent command it seems to not work if the tv is off
alga power screen-state ─╯
╭──────────────────────────────────────────────────────────────────────────────────────────────── Traceback (most recent call last) ─────────────────────────────────────────────────────────────────────────────────────────────────╮
│ /var/home/zany130/.local/share/pipx/venvs/alga/lib/python3.13/site-packages/alga/cli_power.py:48 in screen_state │
│ │
│ 45 def screen_state() -> None: │
│ 46 │ """Show if TV screen is active or off""" │
│ 47 │ │
│ ❱ 48 │ response = client.request("ssap://com.webos.service.tvpower/power/getPowerState") │
│ 49 │ print(f"The TV screen is currently: [bold]{response['state']}[/bold]") │
│ 50 │
│ │
│ /var/home/zany130/.local/share/pipx/venvs/alga/lib/python3.13/site-packages/alga/client.py:50 in request │
│ │
│ 47 │ tv = cfg["tvs"][tv_id] │
│ 48 │ │
│ 49 │ with connect(tv["hostname"]) as connection: │
│ ❱ 50 │ │ do_handshake(connection, tv["key"]) │
│ 51 │ │ │
│ 52 │ │ request: dict[str, Any] = {"type": "request", "uri": uri} │
│ 53 │
│ │
│ ╭─────────────────────────────────────────────────────────────────────────────────── locals ────────────────────────────────────────────────────────────────────────────────────╮ │
│ │ cfg = {'version': 2, 'default_tv': 'default', 'tvs': {'default': {'hostname': '192.168.4.48', 'key': 'c9ba71bf47449974ce6fdb52ca3c1e5a', 'mac': 'ac:5a:f0:66:8e:41'}}} │ │
│ │ connection = <websocket._core.WebSocket object at 0x7f4d4a3a5400> │ │
│ │ data = None │ │
│ │ tv = {'hostname': '192.168.4.48', 'key': 'c9ba71bf47449974ce6fdb52ca3c1e5a', 'mac': 'ac:5a:f0:66:8e:41'} │ │
│ │ tv_id = 'default' │ │
│ │ uri = 'ssap://com.webos.service.tvpower/power/getPowerState' │ │
│ ╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯ │
│ │
│ /var/home/zany130/.local/share/pipx/venvs/alga/lib/python3.13/site-packages/alga/client.py:28 in do_handshake │
│ │
│ 25 ╭───────────────────────────── locals ──────────────────────────────╮ │
│ 26 def do_handshake(connection: WebSocket, key: str) -> None: │ connection = <websocket._core.WebSocket object at 0x7f4d4a3a5400> │ │
│ 27 │ connection.send(json.dumps(get_hello_data(key))) │ key = 'c9ba71bf47449974ce6fdb52ca3c1e5a' │ │
│ ❱ 28 │ response = json.loads(connection.recv()) ╰───────────────────────────────────────────────────────────────────╯ │
│ 29 │ if "client-key" not in response["payload"]: │
│ 30 │ │ raise Exception( │
│ 31 │ │ │ f"Something went wrong with performing a handshake. Response: {response}" │
│ │
│ /home/linuxbrew/.linuxbrew/opt/python@3.13/lib/python3.13/json/__init__.py:352 in loads │
│ │
│ 349 │ if (cls is None and object_hook is None and ╭───────── locals ─────────╮ │
│ 350 │ │ │ parse_int is None and parse_float is None and │ cls = None │ │
│ 351 │ │ │ parse_constant is None and object_pairs_hook is None and not kw): │ kw = {} │ │
│ ❱ 352 │ │ return _default_decoder.decode(s) │ object_hook = None │ │
│ 353 │ if cls is None: │ object_pairs_hook = None │ │
│ 354 │ │ cls = JSONDecoder │ parse_constant = None │ │
│ 355 │ if object_hook is not None: │ parse_float = None │ │
│ │ parse_int = None │ │
│ │ s = '' │ │
│ ╰──────────────────────────╯ │
│ │
│ /home/linuxbrew/.linuxbrew/opt/python@3.13/lib/python3.13/json/decoder.py:345 in decode │
│ │
│ 342 │ │ containing a JSON document). ╭─────────────────────────────── locals ────────────────────────────────╮ │
│ 343 │ │ │ _w = <built-in method match of re.Pattern object at 0x7f4d4b19b100> │ │
│ 344 │ │ """ │ s = '' │ │
│ ❱ 345 │ │ obj, end = self.raw_decode(s, idx=_w(s, 0).end()) │ self = <json.decoder.JSONDecoder object at 0x7f4d4b127770> │ │
│ 346 │ │ end = _w(s, end).end() ╰───────────────────────────────────────────────────────────────────────╯ │
│ 347 │ │ if end != len(s): │
│ 348 │ │ │ raise JSONDecodeError("Extra data", s, end) │
│ │
│ /home/linuxbrew/.linuxbrew/opt/python@3.13/lib/python3.13/json/decoder.py:363 in raw_decode │
│ │
│ 360 │ │ try: ╭────────────────────────── locals ──────────────────────────╮ │
│ 361 │ │ │ obj, end = self.scan_once(s, idx) │ idx = 0 │ │
│ 362 │ │ except StopIteration as err: │ s = '' │ │
│ ❱ 363 │ │ │ raise JSONDecodeError("Expecting value", s, err.value) from None │ self = <json.decoder.JSONDecoder object at 0x7f4d4b127770> │ │
│ 364 │ │ return obj, end ╰────────────────────────────────────────────────────────────╯ │
│ 365 │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
JSONDecodeError: Expecting value: line 1 column 1 (char 0)