feat(event): add single-thread event publisher with retry and cleanup

channel-service/tests/test_event_publisher.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+import asyncio
+
+import pytest
+import respx
+from httpx import Response
+
+from app.clients.mci_server_client import MciServerClient
+from app.models.event import EventStatus, EventType, OutboundEvent
+from app.repositories.event_store import EventStore
+from app.services.event_publisher import EventPublisher
+
+
+@pytest.fixture
+def publisher(tmp_path):
+    db_path = tmp_path / "events.db"
+    store = EventStore(str(db_path))
+    client = MciServerClient("http://mock-mci-server/msg-platform")
+    pub = EventPublisher(store, client, max_retry=2, base_delay_seconds=1, interval_seconds=0.1)
+    yield pub
+
+
+@respx.mock
+def test_publish_delivers_event(publisher):
+    route = respx.post("http://mock-mci-server/msg-platform/api/v1/channel-account/event").mock(
+        return_value=Response(200)
+    )
+    event = OutboundEvent(EventType.HEARTBEAT, "bot-001", "rescue", {"online_status": "online"})
+    publisher.store.save(event)
+
+    async def run():
+        await publisher._tick()
+
+    asyncio.run(run())
+    assert route.called
+    pending = publisher.store.fetch_pending(limit=10)
+    assert len(pending) == 0
+
+
+@respx.mock
+def test_publish_retries_then_dead_letter(publisher):
+    route = respx.post("http://mock-mci-server/msg-platform/api/v1/channel-account/event").mock(
+        return_value=Response(500)
+    )
+    event = OutboundEvent(EventType.HEARTBEAT, "bot-001", "rescue", {})
+    publisher.store.save(event)
+
+    async def run():
+        await publisher._tick()
+
+    asyncio.run(run())
+    assert route.call_count == 1
+    updated = publisher.store.get(event.event_id)
+    assert updated is not None
+    assert updated.status == EventStatus.RETRYING
+    assert updated.attempt_count == 1