Subscribe per component for MQTT discovery (#119974)

* Subscribe per component for MQTT discovery

* Use single assignment

* Handle wildcard subscriptions first

* Split subsRecription handling, update helper

* Fix help_all_subscribe_calls

* Fix import

* Fix test

* Update import order

* Undo move self._last_subscribe

* Recover removed test

* Revert not needed changes to binary_sensor platform tests

* Revert line removal

* Rework interation of discovery topics

* Reduce

* Add comment

* Move comment

* Chain subscriptions

homeassistant/components/mqtt/client.py

@@ -111,6 +111,7 @@ UNSUBSCRIBE_COOLDOWN = 0.1
 TIMEOUT_ACK = 10
 RECONNECT_INTERVAL_SECONDS = 10
 
+MAX_WILDCARD_SUBSCRIBES_PER_CALL = 1
 MAX_SUBSCRIBES_PER_CALL = 500
 MAX_UNSUBSCRIBES_PER_CALL = 500
 
@@ -893,14 +894,27 @@ class MQTT:
         if not self._pending_subscriptions:
             return
 
-        subscriptions: dict[str, int] = self._pending_subscriptions
+        # Split out the wildcard subscriptions, we subscribe to them one by one
+        pending_subscriptions: dict[str, int] = self._pending_subscriptions
+        pending_wildcard_subscriptions = {
+            subscription.topic: pending_subscriptions.pop(subscription.topic)
+            for subscription in self._wildcard_subscriptions
+            if subscription.topic in pending_subscriptions
+        }
+
         self._pending_subscriptions = {}
 
-        subscription_list = list(subscriptions.items())
         debug_enabled = _LOGGER.isEnabledFor(logging.DEBUG)
 
-        for chunk in chunked_or_all(subscription_list, MAX_SUBSCRIBES_PER_CALL):
+        for chunk in chain(
+            chunked_or_all(
+                pending_wildcard_subscriptions.items(), MAX_WILDCARD_SUBSCRIBES_PER_CALL
+            ),
+            chunked_or_all(pending_subscriptions.items(), MAX_SUBSCRIBES_PER_CALL),
+        ):
             chunk_list = list(chunk)
+            if not chunk_list:
+                continue
 
             result, mid = self._mqttc.subscribe(chunk_list)
 

homeassistant/components/mqtt/discovery.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import asyncio
 from collections import deque
 import functools
+from itertools import chain
 import logging
 import re
 import time
@@ -238,10 +239,6 @@ async def async_start(  # noqa: C901
 
         component, node_id, object_id = match.groups()
 
-        if component not in SUPPORTED_COMPONENTS:
-            _LOGGER.warning("Integration %s is not supported", component)
-            return
-
         if payload:
             try:
                 discovery_payload = MQTTDiscoveryPayload(json_loads_object(payload))
@@ -351,9 +348,15 @@ async def async_start(  # noqa: C901
             0,
             job_type=HassJobType.Callback,
         )
-        for topic in (
-            f"{discovery_topic}/+/+/config",
-            f"{discovery_topic}/+/+/+/config",
+        for topic in chain(
+            (
+                f"{discovery_topic}/{component}/+/config"
+                for component in SUPPORTED_COMPONENTS
+            ),
+            (
+                f"{discovery_topic}/{component}/+/+/config"
+                for component in SUPPORTED_COMPONENTS
+            ),
         )
     ]
 

tests/components/mqtt/test_client.py

@@ -13,6 +13,7 @@ import pytest
 
 from homeassistant.components import mqtt
 from homeassistant.components.mqtt.client import RECONNECT_INTERVAL_SECONDS
+from homeassistant.components.mqtt.const import SUPPORTED_COMPONENTS
 from homeassistant.components.mqtt.models import MessageCallbackType, ReceiveMessage
 from homeassistant.config_entries import ConfigEntryDisabler, ConfigEntryState
 from homeassistant.const import (
@@ -1614,8 +1615,9 @@ async def test_subscription_done_when_birth_message_is_sent(
     """Test sending birth message until initial subscription has been completed."""
     mqtt_client_mock = setup_with_birth_msg_client_mock
     subscribe_calls = help_all_subscribe_calls(mqtt_client_mock)
-    assert ("homeassistant/+/+/config", 0) in subscribe_calls
-    assert ("homeassistant/+/+/+/config", 0) in subscribe_calls
+    for component in SUPPORTED_COMPONENTS:
+        assert (f"homeassistant/{component}/+/config", 0) in subscribe_calls
+        assert (f"homeassistant/{component}/+/+/config", 0) in subscribe_calls
     mqtt_client_mock.publish.assert_called_with(
         "homeassistant/status", "online", 0, False
     )

tests/components/mqtt/test_common.py

@@ -16,7 +16,10 @@ import yaml
 from homeassistant import config as module_hass_config
 from homeassistant.components import mqtt
 from homeassistant.components.mqtt import debug_info
-from homeassistant.components.mqtt.const import MQTT_CONNECTION_STATE
+from homeassistant.components.mqtt.const import (
+    MQTT_CONNECTION_STATE,
+    SUPPORTED_COMPONENTS,
+)
 from homeassistant.components.mqtt.mixins import MQTT_ATTRIBUTES_BLOCKED
 from homeassistant.components.mqtt.models import PublishPayloadType
 from homeassistant.config_entries import ConfigEntryState
@@ -75,9 +78,12 @@ type _StateDataType = list[tuple[_MqttMessageType, str | None, _AttributesType |
 def help_all_subscribe_calls(mqtt_client_mock: MqttMockPahoClient) -> list[Any]:
     """Test of a call."""
     all_calls = []
-    for calls in mqtt_client_mock.subscribe.mock_calls:
-        for call in calls[1]:
-            all_calls.extend(call)
+    for call_l1 in mqtt_client_mock.subscribe.mock_calls:
+        if isinstance(call_l1[1][0], list):
+            for call_l2 in call_l1[1]:
+                all_calls.extend(call_l2)
+        else:
+            all_calls.append(call_l1[1])
     return all_calls
 
 
@@ -1178,7 +1184,10 @@ async def help_test_entity_id_update_subscriptions(
 
     state = hass.states.get(f"{domain}.test")
     assert state is not None
-    assert mqtt_mock.async_subscribe.call_count == len(topics) + 2 + DISCOVERY_COUNT
+    assert (
+        mqtt_mock.async_subscribe.call_count
+        == len(topics) + 2 * len(SUPPORTED_COMPONENTS) + DISCOVERY_COUNT
+    )
     for topic in topics:
         mqtt_mock.async_subscribe.assert_any_call(
             topic, ANY, ANY, ANY, HassJobType.Callback

tests/components/mqtt/test_discovery.py

@@ -15,6 +15,7 @@ from homeassistant.components.mqtt.abbreviations import (
     ABBREVIATIONS,
     DEVICE_ABBREVIATIONS,
 )
+from homeassistant.components.mqtt.const import SUPPORTED_COMPONENTS
 from homeassistant.components.mqtt.discovery import (
     MQTT_DISCOVERY_DONE,
     MQTT_DISCOVERY_NEW,
@@ -73,13 +74,10 @@ async def test_subscribing_config_topic(
     discovery_topic = "homeassistant"
     await async_start(hass, discovery_topic, entry)
 
-    call_args1 = mqtt_mock.async_subscribe.mock_calls[0][1]
-    assert call_args1[2] == 0
-    call_args2 = mqtt_mock.async_subscribe.mock_calls[1][1]
-    assert call_args2[2] == 0
-    topics = [call_args1[0], call_args2[0]]
-    assert discovery_topic + "/+/+/config" in topics
-    assert discovery_topic + "/+/+/+/config" in topics
+    topics = [call[1][0] for call in mqtt_mock.async_subscribe.mock_calls]
+    for component in SUPPORTED_COMPONENTS:
+        assert f"{discovery_topic}/{component}/+/config" in topics
+        assert f"{discovery_topic}/{component}/+/+/config" in topics
 
 
 @pytest.mark.parametrize(
@@ -198,8 +196,6 @@ async def test_only_valid_components(
 
     await hass.async_block_till_done()
 
-    assert f"Integration {invalid_component} is not supported" in caplog.text
-
     assert not mock_dispatcher_send.called