ReMe/tests/unit/test_write_metadata_lock.py
2026-06-22 15:41:19 +08:00

207 lines
7.3 KiB
Python

"""Tests for the WriteStep ``metadata`` param and the per-path write lock.
The ``metadata`` feature lets callers extend the on-disk frontmatter beyond
the two reserved fields (``name`` / ``description``) without touching the
step interface. Reserved keys inside the dict are ignored — explicit
top-level parameters always win.
The per-path lock serializes concurrent write_step invocations targeting
the same path within a single process. We exercise it by firing many
concurrent writes at one path and asserting the final state is consistent
(the lock guarantees the last write's bytes land intact, not a torn
interleaving).
"""
# pylint: disable=protected-access
import asyncio
import os
import tempfile
import warnings
from pathlib import Path
import frontmatter
from reme.components.file_store import LocalFileStore
from reme.steps.file_io import write as crud_write
warnings.filterwarnings("ignore", category=DeprecationWarning, module="jieba")
warnings.filterwarnings("ignore", category=DeprecationWarning, module="pkg_resources")
class temp_chdir:
"""Context manager to temporarily chdir into a path and restore on exit."""
def __init__(self, path):
self.path = path
self.old = None
def __enter__(self):
self.old = os.getcwd()
os.chdir(self.path)
return self
def __exit__(self, *exc):
os.chdir(self.old)
def _run(coro):
asyncio.run(coro)
async def _make_store() -> LocalFileStore:
store = LocalFileStore(name="t_write_meta", embedding_store="")
await store.start()
return store
async def _write(store: LocalFileStore, **kwargs):
step = crud_write.WriteStep(file_store=store)
await step(**kwargs)
return step.context.response
# -- metadata expansion ------------------------------------------------------
def test_write_metadata_extends_frontmatter():
"""``metadata={"tags": [...]}`` ends up as a frontmatter field on disk."""
async def run():
with tempfile.TemporaryDirectory() as tmp, temp_chdir(tmp):
store = await _make_store()
resp = await _write(
store,
path="note.md",
name="Hello",
description="A note",
content="body text",
metadata={"tags": ["alpha", "beta"], "priority": 3},
)
assert resp.success is True, resp
on_disk = (Path(tmp) / "note.md").read_text(encoding="utf-8")
post = frontmatter.loads(on_disk)
assert post.metadata["name"] == "Hello"
assert post.metadata["description"] == "A note"
assert post.metadata["tags"] == ["alpha", "beta"]
assert post.metadata["priority"] == 3
assert post.content.strip() == "body text"
await store.close()
print("✓ test_write_metadata_extends_frontmatter passed")
_run(run())
def test_write_metadata_reserved_keys_ignored():
"""``name`` / ``description`` inside ``metadata`` are dropped; explicit args win."""
async def run():
with tempfile.TemporaryDirectory() as tmp, temp_chdir(tmp):
store = await _make_store()
resp = await _write(
store,
path="note.md",
name="ExplicitName",
description="ExplicitDesc",
content="body",
metadata={"name": "DroppedName", "description": "DroppedDesc", "tag": "kept"},
)
assert resp.success is True, resp
post = frontmatter.loads((Path(tmp) / "note.md").read_text(encoding="utf-8"))
assert post.metadata["name"] == "ExplicitName"
assert post.metadata["description"] == "ExplicitDesc"
assert post.metadata["tag"] == "kept"
await store.close()
print("✓ test_write_metadata_reserved_keys_ignored passed")
_run(run())
def test_write_no_metadata_preserves_legacy_shape():
"""No ``metadata`` arg → frontmatter still contains only name/description."""
async def run():
with tempfile.TemporaryDirectory() as tmp, temp_chdir(tmp):
store = await _make_store()
resp = await _write(
store,
path="note.md",
name="N",
description="D",
content="body",
)
assert resp.success is True, resp
post = frontmatter.loads((Path(tmp) / "note.md").read_text(encoding="utf-8"))
assert set(post.metadata.keys()) == {"name", "description"}
await store.close()
print("✓ test_write_no_metadata_preserves_legacy_shape passed")
_run(run())
def test_write_non_md_drops_metadata():
"""Non-markdown target: metadata silently dropped, body written verbatim."""
async def run():
with tempfile.TemporaryDirectory() as tmp, temp_chdir(tmp):
store = await _make_store()
resp = await _write(
store,
path="note.txt",
name="N",
description="D",
content="plain body",
metadata={"tag": "ignored"},
)
assert resp.success is True, resp
on_disk = (Path(tmp) / "note.txt").read_text(encoding="utf-8")
assert on_disk == "plain body"
await store.close()
print("✓ test_write_non_md_drops_metadata passed")
_run(run())
# -- per-path lock -----------------------------------------------------------
def test_write_lock_serializes_concurrent_writes():
"""Many concurrent writes at one path land cleanly — no torn frontmatter.
Without the lock, concurrent writers can interleave reads-of-existence
and writes-of-bytes; with it, each write either runs before or after
every other write. The on-disk file at the end must parse as valid
frontmatter with name matching exactly one of the writers.
"""
async def run():
with tempfile.TemporaryDirectory() as tmp, temp_chdir(tmp):
store = await _make_store()
n = 16
await asyncio.gather(
*(
_write(
store,
path="shared.md",
name=f"writer-{i}",
description=f"desc-{i}",
content=f"body-{i}",
)
for i in range(n)
),
)
on_disk = (Path(tmp) / "shared.md").read_text(encoding="utf-8")
post = frontmatter.loads(on_disk)
assert post.metadata.get("name", "").startswith("writer-"), post.metadata
assert post.metadata.get("description", "").startswith("desc-"), post.metadata
assert post.content.strip().startswith("body-"), post.content
# The body, name, and description must all come from the SAME write
# (no interleaving). Extract the index from each.
idx_name = post.metadata["name"].split("-", 1)[1]
idx_desc = post.metadata["description"].split("-", 1)[1]
idx_body = post.content.strip().split("-", 1)[1]
assert idx_name == idx_desc == idx_body, (idx_name, idx_desc, idx_body)
await store.close()
print("✓ test_write_lock_serializes_concurrent_writes passed")
_run(run())