Optimize api/state

controller.py

@@ -48,6 +48,11 @@ class Controller:
     # HEOS's source id for Spotify, in get_now_playing_media's payload.
     SPOTIFY_SID = "4"
 
+    # A player's input list only changes when someone renames a jack in
+    # the AVR's own setup menu, so browse/browse -- one of the slower HEOS
+    # calls -- does not need asking again on every poll.
+    INPUTS_TTL = 2 * 60 * 60
+
     def __init__(self, cfg):
         self.cfg = cfg
         self.heos = HeosClient(cfg.HEOS_HOST, cfg.HEOS_PORT)
@@ -57,6 +62,7 @@ class Controller:
         self._players = []
         self._groups = []
         self._scanned_at = 0.0
+        self._inputs_cache = {}   # key -> (inputs, cached_at)
         threading.Thread(target=self._keep_warm, daemon=True).start()
 
     def _keep_warm(self):
@@ -71,10 +77,18 @@ class Controller:
 
     # -- network picture -----------------------------------------------
     def scan(self) -> dict:
-        """Re-read every player and group."""
+        """Re-read every player and group, in one round trip."""
         with self._lock:
-            self._players = self.heos.command("player/get_players").get("payload", [])
-            self._groups = self.heos.command("group/get_groups").get("payload", [])
+            players_reply, groups_reply = self.heos.command_batch([
+                ("player/get_players", {}),
+                ("group/get_groups", {}),
+            ])
+            if isinstance(players_reply, HeosError):
+                raise players_reply
+            if isinstance(groups_reply, HeosError):
+                raise groups_reply
+            self._players = players_reply.get("payload", [])
+            self._groups = groups_reply.get("payload", [])
             self._scanned_at = time.monotonic()
             return {"players": self._players, "groups": self._groups}
 
@@ -356,11 +370,19 @@ class Controller:
         """A player's physical inputs, as HEOS itself lists them -- under
         whatever names you gave them in the AVR's own setup menu. HEOS
         carries those renamed labels, not just its generic ids, so this is
-        the same list the HEOS app itself shows under Sources."""
+        the same list the HEOS app itself shows under Sources.
+
+        Cached for INPUTS_TTL: this list rarely changes and browse/browse
+        is one of the slower HEOS calls."""
+        cached = self._inputs_cache.get(key)
+        if cached and time.monotonic() - cached[1] < self.INPUTS_TTL:
+            return cached[0]
         with self._lock:
             self._fresh()
             reply = self.heos.command("browse/browse", sid=self.playback_pid(key))
-            return [{"name": i.get("name"), "input_id": i.get("mid")} for i in reply.get("payload", [])]
+            inputs = [{"name": i.get("name"), "input_id": i.get("mid")} for i in reply.get("payload", [])]
+        self._inputs_cache[key] = (inputs, time.monotonic())
+        return inputs
 
     def play_heos_input(self, key: str, input_id: str, source_key: str = None):
         with self._lock:
@@ -427,6 +449,12 @@ class Controller:
 
     # -- one snapshot for the UI ------------------------------------------
     def state(self) -> dict:
+        """Everything the UI needs, in as few HEOS round trips as the
+        protocol allows: one to scan players/groups (their pids drive
+        everything after), then one batch carrying every room's volume,
+        play state and now-playing plus the AVR's, all sent together and
+        matched up as replies come back rather than asked for one at a
+        time."""
         snapshot = {
             "host": {"key": self.cfg.HOST_KEY, "label": self.cfg.TARGETS[self.cfg.HOST_KEY]["label"]},
             "rooms": [],
@@ -435,10 +463,44 @@ class Controller:
             "errors": [],
         }
 
+        host_pid = None
+        avr_now_playing = None
         with self._lock:
             try:
                 self.scan()
                 joined = set(self.joined_keys())
+
+                room_pids, room_errors = {}, {}
+                for key in self.cfg.ROOM_KEYS:
+                    try:
+                        room_pids[key] = self.member_pids(key)[0]
+                    except TargetError as exc:
+                        room_errors[key] = exc
+                try:
+                    host_pid = self._host_pid()
+                except TargetError:
+                    host_pid = None
+
+                requests, request_keys = [], []
+                for key, pid in room_pids.items():
+                    requests += [
+                        ("player/get_volume", {"pid": pid}),
+                        ("player/get_play_state", {"pid": pid}),
+                        ("player/get_now_playing_media", {"pid": pid}),
+                    ]
+                    request_keys += [(key, "volume"), (key, "play_state"), (key, "now_playing")]
+                if host_pid is not None:
+                    requests.append(("player/get_now_playing_media", {"pid": host_pid}))
+                    request_keys.append((None, "avr_now_playing"))
+
+                results = self.heos.command_batch(requests) if requests else []
+                by_room = {}
+                for (key, field), result in zip(request_keys, results):
+                    if key is None:
+                        avr_now_playing = result
+                    else:
+                        by_room.setdefault(key, {})[field] = result
+
                 for key in self.cfg.ROOM_KEYS:
                     room = {
                         "key": key,
@@ -452,17 +514,29 @@ class Controller:
                         "error": None,
                     }
                     try:
-                        scope, obj_id = self._volume_handles(key)[0]
-                        room["volume"] = self._read_volume(scope, obj_id)
-                        room["play_state"] = self.get_play_state(key)
-                        media = self.now_playing_media(key)
+                        if key in room_errors:
+                            raise room_errors[key]
+                        data = by_room.get(key, {})
+
+                        volume_reply = data.get("volume")
+                        if isinstance(volume_reply, HeosError):
+                            raise volume_reply
+                        room["volume"] = int(parse_message(volume_reply["heos"]["message"]).get("level", -1))
+
+                        play_reply = data.get("play_state")
+                        if isinstance(play_reply, HeosError):
+                            raise play_reply
+                        room["play_state"] = parse_message(play_reply["heos"]["message"]).get("state", "stop")
+
+                        np_reply = data.get("now_playing")
+                        media = {} if isinstance(np_reply, HeosError) else (np_reply.get("payload") or {})
                         room["spotify"] = self._is_spotify(media)
                         # Kept while paused, so the card does not jump about
                         # under the thumb that just pressed pause.
                         if room["play_state"] != "stop":
                             track = self._track(media)
                             if track is not None:
-                                progress = self.heos.progress_for(self.playback_pid(key))
+                                progress = self.heos.progress_for(room_pids[key])
                                 if progress and progress["duration"]:
                                     track["position_ms"] = progress["cur_pos"]
                                     track["duration_ms"] = progress["duration"]
@@ -482,9 +556,14 @@ class Controller:
                 ]
 
         try:
-            current_input = self.avr_current_input()
+            current_input = None
+            if host_pid is not None and avr_now_playing is not None and not isinstance(avr_now_playing, HeosError):
+                payload = avr_now_playing.get("payload") or {}
+                mid = payload.get("mid", "")
+                if mid.startswith("inputs/"):
+                    current_input = {"code": mid, "name": payload.get("station") or payload.get("song") or mid}
             snapshot["avr"] = {
-                "connected": self.avr_connected(),
+                "connected": host_pid is not None,
                 "inputs": self.avr_inputs(),
                 "input": current_input,
                 "now_playing": self.zidoo_now_playing(current_input),

heos.py

@@ -127,6 +127,72 @@ class HeosClient:
                 raise HeosError(_failure_text(heos))
             return reply
 
+    def command_batch(self, requests: list) -> list:
+        """Send several commands back-to-back on the one socket, then
+        collect their replies as they come in -- so N independent reads
+        (a room's volume, play state and now-playing, say) cost one round
+        trip's worth of latency instead of N.
+
+        `requests` is a list of (path, params) pairs. Returns one entry
+        per request, in the same order: the parsed reply dict, or the
+        HeosError it failed with -- a single command failing does not
+        sink the rest of the batch. Only a connection-level problem
+        raises, same as command().
+        """
+        with self._lock:
+            for attempt in (1, 2):
+                try:
+                    if self._sock is None:
+                        self._connect()
+                    return self._exchange_batch(requests)
+                except (OSError, ValueError) as exc:
+                    self._close()
+                    if attempt == 2:
+                        raise HeosError(f"cannot reach HEOS at {self.host}: {exc}") from exc
+
+    def _exchange_batch(self, requests: list) -> list:
+        for path, params in requests:
+            query = "&".join(f"{k}={v}" for k, v in params.items() if v is not None)
+            command = f"heos://{path}" + (f"?{query}" if query else "")
+            self._sock.sendall(command.encode("utf-8") + b"\r\n")
+
+        results = [None] * len(requests)
+        pending = list(range(len(requests)))
+        deadline = time.monotonic() + self.timeout * 3
+        while pending:
+            reply = json.loads(self._read_line(deadline).decode("utf-8"))
+            heos = reply.get("heos", {})
+            if "under process" in heos.get("message", ""):
+                continue  # placeholder ack; the real payload follows
+
+            index = self._claim(pending, requests, heos)
+            if index is None:
+                self._watch_progress(heos)
+                continue  # an event, or a reply to a command outside this batch
+            pending.remove(index)
+            results[index] = HeosError(_failure_text(heos)) if heos.get("result") == "fail" else reply
+        return results
+
+    @staticmethod
+    def _claim(pending, requests, heos):
+        """Which pending request this reply answers. Matches on path
+        first; when more than one pending request shares a path (e.g.
+        get_now_playing_media for two different pids), whichever id
+        parameter -- pid/gid/sid -- the request carried ties it to the
+        right reply, since HEOS echoes it back in the message."""
+        candidates = [i for i in pending if requests[i][0] == heos.get("command")]
+        if not candidates:
+            return None
+        if len(candidates) == 1:
+            return candidates[0]
+        message = parse_message(heos.get("message", ""))
+        for i in candidates:
+            params = requests[i][1]
+            for id_key in ("pid", "gid", "sid"):
+                if id_key in params and message.get(id_key) == str(params[id_key]):
+                    return i
+        return candidates[0]  # can't tell them apart; oldest first
+
     def _watch_progress(self, heos: dict):
         """Skims a passing player_now_playing_progress event for its
         pid/cur_pos/duration, the only source of song-position data this