decomposer: generate deliverable files for Define the service contract and project architecture for the FastAPI endpoint monitoring service.; Implement the typed monitor CRUD API and concurrency-safe in-memory state according to the service design.; Implement secure on-demand endpoint checks with status updates, latency measurement, robust error handling, and redacted structured logs.; Add operational API endpoints and environment-driven runtime configuration to the monitoring service.; Create automated tests for the monitoring service.; Package the service with Docker and developer documentation.; Validate the complete project.

src/monitor_service/store.py

@@ -0,0 +1,53 @@
+import asyncio
+from uuid import UUID, uuid4
+
+from .models import CurrentStatus, Monitor, MonitorCreate, MonitorUpdate, utc_now
+
+
+class MonitorStore:
+    """Concurrency-safe process-local monitor state."""
+
+    def __init__(self) -> None:
+        self._items: dict[UUID, Monitor] = {}
+        self._lock = asyncio.Lock()
+
+    async def create(self, data: MonitorCreate) -> Monitor:
+        now = utc_now()
+        item = Monitor(
+            id=uuid4(), name=data.name, url=data.url, created_at=now,
+            updated_at=now, status=CurrentStatus(),
+        )
+        async with self._lock:
+            self._items[item.id] = item
+        return item
+
+    async def list(self) -> list[Monitor]:
+        async with self._lock:
+            return sorted(self._items.values(), key=lambda item: item.created_at)
+
+    async def get(self, monitor_id: UUID) -> Monitor | None:
+        async with self._lock:
+            return self._items.get(monitor_id)
+
+    async def update(self, monitor_id: UUID, data: MonitorUpdate) -> Monitor | None:
+        changes = data.model_dump(exclude_unset=True)
+        async with self._lock:
+            item = self._items.get(monitor_id)
+            if item is None:
+                return None
+            updated = item.model_copy(update={**changes, "updated_at": utc_now()})
+            self._items[monitor_id] = updated
+            return updated
+
+    async def delete(self, monitor_id: UUID) -> bool:
+        async with self._lock:
+            return self._items.pop(monitor_id, None) is not None
+
+    async def set_status(self, monitor_id: UUID, status: CurrentStatus) -> Monitor | None:
+        async with self._lock:
+            item = self._items.get(monitor_id)
+            if item is None:
+                return None
+            updated = item.model_copy(update={"status": status})
+            self._items[monitor_id] = updated
+            return updated