simple event bus impl

tests/wf_mcp/test_events.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from wf_mcp.broker import WfMcpService
+from wf_mcp.events import EventBus, InMemoryEventSink, make_event
+from wf_mcp.models import ConnectionConfig
+from wf_mcp.storage import FileStore
+
+from .test_support import local_temp_root
+
+
+def test_event_bus_fans_out_to_subscribers() -> None:
+    sink = InMemoryEventSink()
+    seen_kinds: list[str] = []
+    bus = EventBus(sink)
+    bus.subscribe(lambda event: seen_kinds.append(event.kind))
+
+    bus.publish(make_event("catalog_changed", connection_id="demo.personal"))
+
+    assert [event.kind for event in sink.list_events()] == ["catalog_changed"]
+    assert sink.list_events()[0].connection_id == "demo.personal"
+    assert seen_kinds == ["catalog_changed"]
+
+
+def test_service_records_events_through_event_bus() -> None:
+    sink = InMemoryEventSink()
+    bus = EventBus(sink)
+    service = WfMcpService(
+        store=FileStore(local_temp_root() / "event_bus_service_store"),
+        event_bus=bus,
+    )
+
+    service.register_connection(
+        ConnectionConfig(id="demo.personal", server="demo", account="personal")
+    )
+
+    assert service.list_events()[0].kind == "connection_registered"
+    assert sink.list_events()[0] is service.list_events()[0]