Store automation traces indexed by run_id (#47509)

* Store traces indexed by run_id

* Format

* Add test

* Add test

* Clarify comment

homeassistant/components/automation/__init__.py

@@ -1,7 +1,8 @@
 """Allow to set up simple automation rules via the config file."""
-from collections import deque
+from collections import OrderedDict
 from contextlib import contextmanager
 import datetime as dt
+from itertools import count
 import logging
 from typing import (
     Any,
@@ -240,6 +241,8 @@ async def async_setup(hass, config):
 class AutomationTrace:
     """Container for automation trace."""
 
+    _runids = count(0)
+
     def __init__(
         self,
         unique_id: Optional[str],
@@ -254,6 +257,7 @@ class AutomationTrace:
         self._context: Context = context
         self._error: Optional[Exception] = None
         self._state: str = "running"
+        self.runid: str = str(next(self._runids))
         self._timestamp_finish: Optional[dt.datetime] = None
         self._timestamp_start: dt.datetime = dt_util.utcnow()
         self._trigger: Dict[str, Any] = trigger
@@ -300,6 +304,7 @@ class AutomationTrace:
             "config": self._config,
             "context": self._context,
             "state": self._state,
+            "run_id": self.runid,
             "timestamp": {
                 "start": self._timestamp_start,
                 "finish": self._timestamp_finish,
@@ -313,16 +318,37 @@ class AutomationTrace:
         return result
 
 
+class LimitedSizeDict(OrderedDict):
+    """OrderedDict limited in size."""
+
+    def __init__(self, *args, **kwds):
+        """Initialize OrderedDict limited in size."""
+        self.size_limit = kwds.pop("size_limit", None)
+        OrderedDict.__init__(self, *args, **kwds)
+        self._check_size_limit()
+
+    def __setitem__(self, key, value):
+        """Set item and check dict size."""
+        OrderedDict.__setitem__(self, key, value)
+        self._check_size_limit()
+
+    def _check_size_limit(self):
+        """Check dict size and evict items in FIFO order if needed."""
+        if self.size_limit is not None:
+            while len(self) > self.size_limit:
+                self.popitem(last=False)
+
+
 @contextmanager
 def trace_automation(hass, unique_id, config, trigger, context):
     """Trace action execution of automation with automation_id."""
     automation_trace = AutomationTrace(unique_id, config, trigger, context)
 
     if unique_id:
-        if unique_id not in hass.data[DATA_AUTOMATION_TRACE]:
+        automation_traces = hass.data[DATA_AUTOMATION_TRACE]
-            hass.data[DATA_AUTOMATION_TRACE][unique_id] = deque([], STORED_TRACES)
+        if unique_id not in automation_traces:
-        traces = hass.data[DATA_AUTOMATION_TRACE][unique_id]
+            automation_traces[unique_id] = LimitedSizeDict(size_limit=STORED_TRACES)
-        traces.append(automation_trace)
+        automation_traces[unique_id][automation_trace.runid] = automation_trace
 
     try:
         yield automation_trace
@@ -835,7 +861,7 @@ def get_debug_traces_for_automation(hass, automation_id):
     """Return a serializable list of debug traces for an automation."""
     traces = []
 
-    for trace in hass.data[DATA_AUTOMATION_TRACE].get(automation_id, []):
+    for trace in hass.data[DATA_AUTOMATION_TRACE].get(automation_id, {}).values():
         traces.append(trace.as_dict())
 
     return traces

tests/components/config/test_automation.py

@@ -3,7 +3,7 @@ import json
 from unittest.mock import patch
 
 from homeassistant.bootstrap import async_setup_component
-from homeassistant.components import config
+from homeassistant.components import automation, config
 
 from tests.components.blueprint.conftest import stub_blueprint_populate  # noqa: F401
 
@@ -325,3 +325,81 @@ async def test_get_automation_trace(hass, hass_ws_client):
     assert trace["trigger"]["description"] == "event 'test_event2'"
     assert trace["unique_id"] == "moon"
     assert trace["variables"]
+
+
+async def test_automation_trace_overflow(hass, hass_ws_client):
+    """Test the number of stored traces per automation is limited."""
+    id = 1
+
+    def next_id():
+        nonlocal id
+        id += 1
+        return id
+
+    sun_config = {
+        "id": "sun",
+        "trigger": {"platform": "event", "event_type": "test_event"},
+        "action": {"event": "some_event"},
+    }
+    moon_config = {
+        "id": "moon",
+        "trigger": {"platform": "event", "event_type": "test_event2"},
+        "action": {"event": "another_event"},
+    }
+
+    assert await async_setup_component(
+        hass,
+        "automation",
+        {
+            "automation": [
+                sun_config,
+                moon_config,
+            ]
+        },
+    )
+
+    with patch.object(config, "SECTIONS", ["automation"]):
+        await async_setup_component(hass, "config", {})
+
+    client = await hass_ws_client()
+
+    await client.send_json({"id": next_id(), "type": "automation/trace"})
+    response = await client.receive_json()
+    assert response["success"]
+    assert response["result"] == {}
+
+    await client.send_json(
+        {"id": next_id(), "type": "automation/trace", "automation_id": "sun"}
+    )
+    response = await client.receive_json()
+    assert response["success"]
+    assert response["result"] == {"sun": []}
+
+    # Trigger "sun" and "moon" automation once
+    hass.bus.async_fire("test_event")
+    hass.bus.async_fire("test_event2")
+    await hass.async_block_till_done()
+
+    # Get traces
+    await client.send_json({"id": next_id(), "type": "automation/trace"})
+    response = await client.receive_json()
+    assert response["success"]
+    assert len(response["result"]["moon"]) == 1
+    moon_run_id = response["result"]["moon"][0]["run_id"]
+    assert len(response["result"]["sun"]) == 1
+
+    # Trigger "moon" automation enough times to overflow the number of stored traces
+    for _ in range(automation.STORED_TRACES):
+        hass.bus.async_fire("test_event2")
+        await hass.async_block_till_done()
+
+    await client.send_json({"id": next_id(), "type": "automation/trace"})
+    response = await client.receive_json()
+    assert response["success"]
+    assert len(response["result"]["moon"]) == automation.STORED_TRACES
+    assert len(response["result"]["sun"]) == 1
+    assert int(response["result"]["moon"][0]["run_id"]) == int(moon_run_id) + 1
+    assert (
+        int(response["result"]["moon"][-1]["run_id"])
+        == int(moon_run_id) + automation.STORED_TRACES
+    )

tests/helpers/test_script.py

@@ -1192,11 +1192,11 @@ async def test_condition_all_cached(hass):
     assert len(script_obj._config_cache) == 2
 
 
-async def test_repeat_count(hass, caplog):
+@pytest.mark.parametrize("count", [3, script.ACTION_TRACE_NODE_MAX_LEN * 2])
+async def test_repeat_count(hass, caplog, count):
     """Test repeat action w/ count option."""
     event = "test_event"
     events = async_capture_events(hass, event)
-    count = 3
 
     alias = "condition step"
     sequence = cv.SCRIPT_SCHEMA(
@@ -1215,6 +1215,7 @@ async def test_repeat_count(hass, caplog):
             },
         }
     )
+    with script.trace_action(None):
         script_obj = script.Script(hass, sequence, "Test Name", "test_domain")
 
     await script_obj.async_run(context=Context())
@@ -1226,6 +1227,13 @@ async def test_repeat_count(hass, caplog):
         assert event.data.get("index") == index + 1
         assert event.data.get("last") == (index == count - 1)
     assert caplog.text.count(f"Repeating {alias}") == count
+    assert_action_trace(
+        {
+            "": [{}],
+            "0": [{}],
+            "0/0/0": [{}] * min(count, script.ACTION_TRACE_NODE_MAX_LEN),
+        }
+    )
 
 
 @pytest.mark.parametrize("condition", ["while", "until"])