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75 lines
2.6 KiB
Python
75 lines
2.6 KiB
Python
"""
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Unit tests for ``is_model_cached``'s handling of stale ``.incomplete`` blobs.
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A retried or concurrent download can leave an orphaned ``.incomplete`` file
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next to its now-completed counterpart (same blob hash, no suffix). Only a
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genuinely in-progress download -- an ``.incomplete`` with no completed blob
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alongside it -- should mark the model as not cached.
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``is_model_cached`` is extracted and exec'd standalone (instead of importing
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``backend.backends.base``) so this test doesn't pull in the module's sibling
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imports (audio/progress/hf_progress/tasks), which in turn require the full
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ML stack (torch/transformers/librosa/fastapi/...) this pure filesystem check
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never touches.
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"""
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import ast
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import logging
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from pathlib import Path
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from typing import Optional
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_SOURCE = (Path(__file__).parent.parent / "backends" / "base.py").read_text()
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_MODULE = ast.parse(_SOURCE)
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_FUNC_SRC = "\n\n".join(
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ast.get_source_segment(_SOURCE, node)
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for node in _MODULE.body
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if isinstance(node, ast.FunctionDef) and node.name in ("has_in_progress_download", "is_model_cached")
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)
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_namespace = {
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"Path": Path,
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"Optional": Optional,
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"logger": logging.getLogger("test_is_model_cached"),
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}
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exec(_FUNC_SRC, _namespace) # noqa: S102
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is_model_cached = _namespace["is_model_cached"]
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def _make_repo_cache(tmp_path, repo="org/model"):
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repo_dir = tmp_path / ("models--" + repo.replace("/", "--"))
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blobs_dir = repo_dir / "blobs"
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snapshots_dir = repo_dir / "snapshots" / "abc123"
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blobs_dir.mkdir(parents=True)
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snapshots_dir.mkdir(parents=True)
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return repo_dir, blobs_dir, snapshots_dir
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def test_orphaned_incomplete_blob_does_not_block_cache_hit(tmp_path, monkeypatch):
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import huggingface_hub.constants as hf_constants
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monkeypatch.setattr(hf_constants, "HF_HUB_CACHE", str(tmp_path))
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repo = "org/model"
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_, blobs_dir, snapshots_dir = _make_repo_cache(tmp_path, repo)
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completed_blob = blobs_dir / "deadbeef"
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completed_blob.write_bytes(b"weights")
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(blobs_dir / "deadbeef.incomplete").write_bytes(b"stale partial")
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(snapshots_dir / "model.safetensors").symlink_to(completed_blob)
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assert is_model_cached(repo) is True
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def test_genuinely_in_progress_download_is_not_cached(tmp_path, monkeypatch):
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import huggingface_hub.constants as hf_constants
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monkeypatch.setattr(hf_constants, "HF_HUB_CACHE", str(tmp_path))
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repo = "org/model"
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_, blobs_dir, snapshots_dir = _make_repo_cache(tmp_path, repo)
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(blobs_dir / "feedface.incomplete").write_bytes(b"partial")
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(snapshots_dir / "config.json").write_text("{}")
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assert is_model_cached(repo) is False
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