refactor(collector): use state file for container detection, drop label heuristics

_load_service_container_names() reads decnet-state.json and builds the
exact set of expected container names ({decky}-{service}). is_service_container()
and is_service_event() do a direct set lookup — no regex, no label
inspection, no heuristics.

decnet/web/collector.py

@@ -83,43 +83,34 @@ def parse_rfc5424(line: str) -> Optional[dict[str, Any]]:
 
 # ─── Container helpers ────────────────────────────────────────────────────────
 
-def _is_decnet_service_labels(labels: dict) -> bool:
+def _load_service_container_names() -> set[str]:
     """
-    Return True if the Compose labels indicate a DECNET service container.
-
-    Discriminator: base containers have no depends_on (they own the IP);
-    service containers all declare depends_on pointing at their base.
-    Both sets carry com.docker.compose.project=decnet.
+    Return the exact set of service container names from decnet-state.json.
+    Format: {decky_name}-{service_name}, e.g. 'omega-decky-smtp'.
+    Returns an empty set if no state file exists.
     """
-    if labels.get("com.docker.compose.project") != "decnet":
-        return False
-    return bool(labels.get("com.docker.compose.depends_on", "").strip())
+    from decnet.config import load_state
+    state = load_state()
+    if state is None:
+        return set()
+    config, _ = state
+    names: set[str] = set()
+    for decky in config.deckies:
+        for svc in decky.services:
+            names.add(f"{decky.name}-{svc.replace('_', '-')}")
+    return names
 
 
 def is_service_container(container) -> bool:
-    """
-    Return True for DECNET service containers.
-
-    Accepts either a Docker SDK container object or a plain name string
-    (legacy path — falls back to label-free heuristic when only a name
-    is available, which is always less reliable).
-    """
-    if isinstance(container, str):
-        # Called with a name only (e.g. from event stream before full inspect).
-        # Best-effort: a base container name has no service suffix, so it won't
-        # contain a hyphen after the decky name. We can't be certain without
-        # labels, so this path is only kept for the event fast-path and is
-        # superseded by the label check in the initial scan.
-        name = container.lstrip("/")
-        # Filter out anything not from our project (best effort via name)
-        return "-" in name  # will be re-checked via labels on _spawn
-    labels = container.labels or {}
-    return _is_decnet_service_labels(labels)
+    """Return True if this Docker container is a known DECNET service container."""
+    name = (container if isinstance(container, str) else container.name).lstrip("/")
+    return name in _load_service_container_names()
 
 
 def is_service_event(attrs: dict) -> bool:
-    """Return True if a Docker event's Actor.Attributes are for a DECNET service container."""
-    return _is_decnet_service_labels(attrs)
+    """Return True if a Docker start event is for a known DECNET service container."""
+    name = attrs.get("name", "").lstrip("/")
+    return name in _load_service_container_names()
 
 
 # ─── Blocking stream worker (runs in a thread) ────────────────────────────────

tests/test_collector.py

@@ -2,29 +2,14 @@
 
 import json
 from types import SimpleNamespace
+from unittest.mock import patch
 from decnet.web.collector import parse_rfc5424, is_service_container, is_service_event
 
-
-def _make_container(project="decnet", depends_on="omega-decky:service_started:false"):
-    """Return a mock container object with Compose labels."""
-    return SimpleNamespace(
-        name="omega-decky-http",
-        labels={
-            "com.docker.compose.project": project,
-            "com.docker.compose.depends_on": depends_on,
-        },
-    )
+_KNOWN_NAMES = {"omega-decky-http", "omega-decky-smtp", "relay-decky-ftp"}
 
 
-def _make_base_container():
-    """Return a mock base container (no depends_on)."""
-    return SimpleNamespace(
-        name="omega-decky",
-        labels={
-            "com.docker.compose.project": "decnet",
-            "com.docker.compose.depends_on": "",
-        },
-    )
+def _make_container(name="omega-decky-http"):
+    return SimpleNamespace(name=name)
 
 
 class TestParseRfc5424:
@@ -105,42 +90,43 @@ class TestParseRfc5424:
 
 
 class TestIsServiceContainer:
-    def test_service_container_returns_true(self):
-        assert is_service_container(_make_container()) is True
+    def test_known_container_returns_true(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_container(_make_container("omega-decky-http")) is True
+            assert is_service_container(_make_container("omega-decky-smtp")) is True
+            assert is_service_container(_make_container("relay-decky-ftp")) is True
 
     def test_base_container_returns_false(self):
-        assert is_service_container(_make_base_container()) is False
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_container(_make_container("omega-decky")) is False
 
-    def test_different_decky_name_styles(self):
-        # omega-decky style (ini section name)
-        assert is_service_container(_make_container(depends_on="omega-decky:service_started:false")) is True
-        # relay-decky style
-        assert is_service_container(_make_container(depends_on="relay-decky:service_started:false")) is True
+    def test_unrelated_container_returns_false(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_container(_make_container("nginx")) is False
 
-    def test_wrong_project_returns_false(self):
-        assert is_service_container(_make_container(project="someother")) is False
+    def test_strips_leading_slash(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_container(_make_container("/omega-decky-http")) is True
+            assert is_service_container(_make_container("/omega-decky")) is False
 
-    def test_no_labels_returns_false(self):
-        c = SimpleNamespace(name="nginx", labels={})
-        assert is_service_container(c) is False
+    def test_no_state_returns_false(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=set()):
+            assert is_service_container(_make_container("omega-decky-http")) is False
 
 
 class TestIsServiceEvent:
-    def _make_attrs(self, project="decnet", depends_on="omega-decky:service_started:false"):
-        return {
-            "com.docker.compose.project": project,
-            "com.docker.compose.depends_on": depends_on,
-            "name": "omega-decky-smtp",
-        }
-
-    def test_service_event_returns_true(self):
-        assert is_service_event(self._make_attrs()) is True
+    def test_known_service_event_returns_true(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_event({"name": "omega-decky-smtp"}) is True
 
     def test_base_event_returns_false(self):
-        assert is_service_event(self._make_attrs(depends_on="")) is False
-
-    def test_wrong_project_returns_false(self):
-        assert is_service_event(self._make_attrs(project="other")) is False
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_event({"name": "omega-decky"}) is False
 
     def test_unrelated_event_returns_false(self):
-        assert is_service_event({"name": "nginx"}) is False
+        with patch("decnet.web.collector._load_service_container_names", return_value=_KNOWN_NAMES):
+            assert is_service_event({"name": "nginx"}) is False
+
+    def test_no_state_returns_false(self):
+        with patch("decnet.web.collector._load_service_container_names", return_value=set()):
+            assert is_service_event({"name": "omega-decky-smtp"}) is False