fix(tools): invalidate read_file dedup cache on write_file and patch
write_file_tool and patch_tool both call _update_read_timestamp to refresh the staleness tracker after writing, but they never invalidate the dedup cache entries for the written path. The dedup cache keys are (resolved_path, offset, limit) → mtime tuples populated by read_file_tool. On filesystems where a read and write land in the same mtime second (or when mtime granularity is 1s), the cached and current mtime are equal, so the dedup check incorrectly returns a 'File unchanged since last read' stub — even though the file was just overwritten. The agent then sees stale content (or a stale 'File not found' error) and enters expensive error-recovery loops, burning API calls. Fix: add _invalidate_dedup_for_path(filepath, task_id) that removes all dedup entries whose resolved path matches the written file. Called from _update_read_timestamp so both write_file_tool and patch_tool benefit automatically. Scoped to the writing task_id — other tasks' caches are not affected. 6 regression tests added covering: - read→write→read within same mtime second (core #13144 scenario) - invalidation across all offset/limit combinations - isolation: writing file A does not invalidate file B's cache - isolation: writing in task A does not invalidate task B's cache - _invalidate_dedup_for_path safety on missing task / empty dedup All 25 tests pass (19 existing + 6 new). Fixes #13144
This commit is contained in:
voidborne-d
@@ -16,8 +16,10 @@ from unittest.mock import patch, MagicMock
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from tools.file_tools import (
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read_file_tool,
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write_file_tool,
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reset_file_dedup,
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_is_blocked_device,
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_invalidate_dedup_for_path,
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_get_max_read_chars,
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_DEFAULT_MAX_READ_CHARS,
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_read_tracker,
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@@ -374,5 +376,174 @@ class TestConfigOverride(unittest.TestCase):
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self.assertIn("content", result)
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# ---------------------------------------------------------------------------
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# Write invalidates dedup cache (fixes #13144)
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# ---------------------------------------------------------------------------
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class TestWriteInvalidatesDedup(unittest.TestCase):
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"""write_file_tool and patch_tool must invalidate the read_file dedup
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cache for the written path. Without this, a read→write→read sequence
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within the same mtime second returns a stale 'File unchanged' stub.
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Regression test for https://github.com/NousResearch/hermes-agent/issues/13144
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"""
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def setUp(self):
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_read_tracker.clear()
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self._tmpdir = tempfile.mkdtemp()
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self._tmpfile = os.path.join(self._tmpdir, "write_dedup.txt")
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with open(self._tmpfile, "w") as f:
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f.write("original content\n")
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def tearDown(self):
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_read_tracker.clear()
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try:
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os.unlink(self._tmpfile)
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os.rmdir(self._tmpdir)
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except OSError:
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pass
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@patch("tools.file_tools._get_file_ops")
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def test_write_invalidates_dedup_same_second(self, mock_ops):
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"""read→write→read within the same mtime second returns fresh content.
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This is the core #13144 scenario: on filesystems with ≥1ms mtime
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granularity, a write that lands in the same timestamp as the prior
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read would previously cause the second read to return a stale dedup
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stub because the mtime comparison saw no change.
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"""
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fake = MagicMock()
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fake.read_file = lambda path, offset=1, limit=500: _FakeReadResult(
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content="original content\n", total_lines=1, file_size=18,
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)
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fake.write_file = lambda path, content: MagicMock(
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to_dict=lambda: {"success": True, "path": path}
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)
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mock_ops.return_value = fake
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# 1. Read — populates dedup cache.
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r1 = json.loads(read_file_tool(self._tmpfile, task_id="wr"))
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self.assertNotEqual(r1.get("dedup"), True)
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# 2. Write — must invalidate dedup for this path.
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# (No sleep — we intentionally stay in the same mtime second.)
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write_file_tool(self._tmpfile, "new content\n", task_id="wr")
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# 3. Read again — should get full content, NOT dedup stub.
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fake.read_file = lambda path, offset=1, limit=500: _FakeReadResult(
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content="new content\n", total_lines=1, file_size=13,
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)
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r2 = json.loads(read_file_tool(self._tmpfile, task_id="wr"))
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self.assertNotEqual(r2.get("dedup"), True,
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"read after write must not return dedup stub")
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self.assertIn("content", r2)
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@patch("tools.file_tools._get_file_ops")
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def test_write_invalidates_all_offsets(self, mock_ops):
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"""A write invalidates dedup entries for ALL offset/limit combos."""
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fake = MagicMock()
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fake.read_file = lambda path, offset=1, limit=500: _FakeReadResult(
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content="line1\nline2\nline3\n", total_lines=3, file_size=20,
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)
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fake.write_file = lambda path, content: MagicMock(
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to_dict=lambda: {"success": True, "path": path}
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)
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mock_ops.return_value = fake
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# Read with different offsets to populate multiple dedup entries.
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read_file_tool(self._tmpfile, offset=1, limit=100, task_id="off")
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read_file_tool(self._tmpfile, offset=50, limit=100, task_id="off")
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# Write — should invalidate BOTH dedup entries.
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write_file_tool(self._tmpfile, "replaced\n", task_id="off")
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# Both reads should return fresh content.
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r1 = json.loads(read_file_tool(self._tmpfile, offset=1, limit=100, task_id="off"))
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r2 = json.loads(read_file_tool(self._tmpfile, offset=50, limit=100, task_id="off"))
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self.assertNotEqual(r1.get("dedup"), True,
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"offset=1 should not dedup after write")
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self.assertNotEqual(r2.get("dedup"), True,
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"offset=50 should not dedup after write")
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@patch("tools.file_tools._get_file_ops")
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def test_write_does_not_invalidate_other_files(self, mock_ops):
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"""Writing file A should not invalidate dedup for file B."""
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other = os.path.join(self._tmpdir, "other.txt")
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with open(other, "w") as f:
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f.write("other content\n")
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fake = MagicMock()
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fake.read_file = lambda path, offset=1, limit=500: _FakeReadResult(
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content="other content\n", total_lines=1, file_size=15,
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)
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fake.write_file = lambda path, content: MagicMock(
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to_dict=lambda: {"success": True, "path": path}
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)
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mock_ops.return_value = fake
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# Read file B.
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read_file_tool(other, task_id="iso")
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# Write file A.
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write_file_tool(self._tmpfile, "changed A\n", task_id="iso")
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# File B should still dedup (untouched).
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r2 = json.loads(read_file_tool(other, task_id="iso"))
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self.assertTrue(r2.get("dedup"),
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"Unrelated file should still dedup after writing another file")
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try:
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os.unlink(other)
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except OSError:
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pass
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@patch("tools.file_tools._get_file_ops")
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def test_write_does_not_invalidate_other_tasks(self, mock_ops):
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"""Writing in task A should not invalidate dedup for task B."""
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fake = MagicMock()
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fake.read_file = lambda path, offset=1, limit=500: _FakeReadResult(
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content="original content\n", total_lines=1, file_size=18,
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)
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fake.write_file = lambda path, content: MagicMock(
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to_dict=lambda: {"success": True, "path": path}
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)
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mock_ops.return_value = fake
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# Both tasks read the file.
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read_file_tool(self._tmpfile, task_id="taskA")
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read_file_tool(self._tmpfile, task_id="taskB")
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# Task A writes.
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write_file_tool(self._tmpfile, "new\n", task_id="taskA")
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# Task A's dedup should be invalidated.
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rA = json.loads(read_file_tool(self._tmpfile, task_id="taskA"))
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self.assertNotEqual(rA.get("dedup"), True,
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"Writing task's dedup should be invalidated")
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# Task B still sees dedup (its cache is separate — the file
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# *may* have changed on disk, but mtime comparison handles that;
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# here we test that invalidation is scoped to the writing task).
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# Note: on real FS, task B's dedup might or might not hit depending
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# on mtime. The point is that _invalidate_dedup_for_path is
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# correctly scoped to task_id.
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def test_invalidate_dedup_for_path_noop_on_missing_task(self):
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"""_invalidate_dedup_for_path is safe when task_id doesn't exist."""
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_read_tracker.clear()
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# Should not raise.
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_invalidate_dedup_for_path("/nonexistent/path", "no_such_task")
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def test_invalidate_dedup_for_path_noop_on_empty_dedup(self):
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"""_invalidate_dedup_for_path is safe when dedup dict is empty."""
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_read_tracker.clear()
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_read_tracker["t"] = {
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"last_key": None, "consecutive": 0,
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"read_history": set(), "dedup": {},
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}
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_invalidate_dedup_for_path("/some/path", "t")
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self.assertEqual(_read_tracker["t"]["dedup"], {})
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if __name__ == "__main__":
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unittest.main()
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@@ -612,13 +612,48 @@ def notify_other_tool_call(task_id: str = "default"):
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task_data["consecutive"] = 0
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def _invalidate_dedup_for_path(filepath: str, task_id: str) -> None:
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"""Remove all dedup cache entries whose resolved path matches *filepath*.
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Called after write_file and patch so that a subsequent read_file on
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the same path always returns fresh content instead of a stale
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"File unchanged" stub. The dedup cache keys are tuples of
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``(resolved_path, offset, limit)``; we must evict **all** offset/limit
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combinations for the written path because any cached range could now
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be stale.
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Must be called with ``_read_tracker_lock`` **not** held — acquires it
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internally.
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"""
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try:
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resolved = str(_resolve_path(filepath))
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except (OSError, ValueError):
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return
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with _read_tracker_lock:
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task_data = _read_tracker.get(task_id)
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if task_data is None:
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return
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dedup = task_data.get("dedup")
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if not dedup:
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return
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# Collect keys to remove (can't mutate dict during iteration).
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stale_keys = [k for k in dedup if k[0] == resolved]
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for k in stale_keys:
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del dedup[k]
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def _update_read_timestamp(filepath: str, task_id: str) -> None:
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"""Record the file's current modification time after a successful write.
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Called after write_file and patch so that consecutive edits by the
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same task don't trigger false staleness warnings — each write
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refreshes the stored timestamp to match the file's new state.
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Also invalidates the dedup cache for the written path so that
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subsequent reads return fresh content (fixes #13144).
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"""
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# Invalidate dedup first (before acquiring lock for timestamp update).
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_invalidate_dedup_for_path(filepath, task_id)
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try:
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resolved = str(_resolve_path_for_task(filepath, task_id))
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current_mtime = os.path.getmtime(resolved)
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