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_collect_delegate_child_ids() walks the _delegate_from marker chain to gather delegate subagents for cascade deletion, but started its visited set empty. When the chain loops back onto a parent — a delegation cycle, or a parent that is also another parent's delegate child when several ids are deleted together — that parent was collected as one of its own descendants and then permanently deleted, along with all of its messages, by _delete_delegate_children(). Seed the visited set with the parent ids so they can never be re-collected, and exclude them from the returned child set. Callers (delete_session, bulk delete) remove the parents separately, so this only prevents the unintended parent deletion; legitimate child collection is unchanged. Add regression tests (in-memory sqlite) covering single/multi-level delegate chains, the parent_session_id+marker branch, untagged children (orphan-don't-delete contract), and the cycle case that previously leaked the parent into the deletion set. Fixes #49148
103 lines
4 KiB
Python
103 lines
4 KiB
Python
"""Regression tests for delegate-child cascade collection (#49148).
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`_collect_delegate_child_ids` walks the ``_delegate_from`` marker chain to
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find delegate subagents that should be cascade-deleted with their parent.
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The parents themselves are deleted separately by the callers, so they must
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never appear in the collected child set. A delegation cycle (or a parent
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that is also another parent's delegate child) used to leak the parent into
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the deletion set, permanently deleting the parent session and its messages.
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"""
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import json
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import sqlite3
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from hermes_state import _collect_delegate_child_ids, _delete_delegate_children
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def _make_conn():
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conn = sqlite3.connect(":memory:")
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conn.row_factory = sqlite3.Row
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conn.execute(
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"CREATE TABLE sessions ("
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" id TEXT PRIMARY KEY,"
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" parent_session_id TEXT,"
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" model_config TEXT)"
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)
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conn.execute("CREATE TABLE messages (session_id TEXT)")
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return conn
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def _add_session(conn, sid, *, delegate_from=None, parent_session_id=None, messages=0):
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model_config = json.dumps({"_delegate_from": delegate_from}) if delegate_from else None
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conn.execute(
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"INSERT INTO sessions (id, parent_session_id, model_config) VALUES (?, ?, ?)",
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(sid, parent_session_id, model_config),
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)
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for _ in range(messages):
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conn.execute("INSERT INTO messages (session_id) VALUES (?)", (sid,))
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class TestCollectDelegateChildIds:
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def test_collects_delegate_child_excludes_parent(self):
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conn = _make_conn()
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_add_session(conn, "P")
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_add_session(conn, "C", delegate_from="P")
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result = _collect_delegate_child_ids(conn, ["P"])
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assert "C" in result
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assert "P" not in result
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def test_multilevel_chain_collects_all_descendants(self):
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conn = _make_conn()
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_add_session(conn, "O")
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_add_session(conn, "A", delegate_from="O")
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_add_session(conn, "B", delegate_from="A")
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result = set(_collect_delegate_child_ids(conn, ["O"]))
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assert result == {"A", "B"} # parent O excluded, both descendants in
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def test_parent_session_id_branch_with_marker_collected(self):
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# Second OR clause: parent_session_id match AND _delegate_from present.
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conn = _make_conn()
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_add_session(conn, "P")
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_add_session(conn, "C", parent_session_id="P", delegate_from="something")
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assert _collect_delegate_child_ids(conn, ["P"]) == ["C"]
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def test_untagged_child_not_collected(self):
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# No _delegate_from marker -> orphan-don't-delete contract.
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conn = _make_conn()
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_add_session(conn, "P")
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_add_session(conn, "C", parent_session_id="P")
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assert _collect_delegate_child_ids(conn, ["P"]) == []
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def test_cycle_terminates_and_excludes_parent(self):
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# The #49148 bug: A and B reference each other via _delegate_from.
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# Collection must terminate and never return the seed parent A.
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conn = _make_conn()
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_add_session(conn, "A", delegate_from="B")
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_add_session(conn, "B", delegate_from="A")
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result = _collect_delegate_child_ids(conn, ["A"])
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assert "A" not in result # parent never collected as its own child
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assert result == ["B"]
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class TestDeleteDelegateChildrenPreservesParent:
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def test_cycle_does_not_delete_parent_or_its_messages(self):
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conn = _make_conn()
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_add_session(conn, "A", delegate_from="B", messages=3)
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_add_session(conn, "B", delegate_from="A", messages=2)
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removed = _delete_delegate_children(conn, ["A"])
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assert "A" not in removed
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# Parent A and its messages survive; only delegate child B is gone.
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assert conn.execute("SELECT COUNT(*) FROM sessions WHERE id='A'").fetchone()[0] == 1
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assert conn.execute("SELECT COUNT(*) FROM messages WHERE session_id='A'").fetchone()[0] == 3
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assert conn.execute("SELECT COUNT(*) FROM sessions WHERE id='B'").fetchone()[0] == 0
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assert conn.execute("SELECT COUNT(*) FROM messages WHERE session_id='B'").fetchone()[0] == 0
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