phase 4

core/detect/graph/events.py

@@ -0,0 +1,27 @@
+"""
+Graph event emission — node state tracking + SSE graph_update events.
+"""
+
+from __future__ import annotations
+
+from core.detect import emit
+from core.detect.state import DetectState
+
+
+# Track node states across pipeline runs
+_node_states: dict[str, dict[str, str]] = {}
+
+
+def emit_transition(state: DetectState, node: str, status: str, node_list: list[str]):
+    """Update node status and emit graph_update SSE event."""
+    job_id = state.get("job_id")
+    if not job_id:
+        return
+
+    if job_id not in _node_states:
+        _node_states[job_id] = {n: "pending" for n in node_list}
+
+    _node_states[job_id][node] = status
+
+    nodes = [{"id": n, "status": _node_states[job_id][n]} for n in node_list]
+    emit.graph_update(job_id, nodes)