kawa
dea41483b5
- imptune/db/database.py: deferred SqliteDatabase with WAL + foreign_keys pragmas and init_db() - imptune/db/models.py: full schema (Client, Driver, Printer, Icon) for phases 1-5 - imptune/storage/driver_store.py: SHA256 content-addressed DriverStore with dedup - tests/test_db.py: 7 TDD tests covering all db and storage behaviors
35 lines
1.1 KiB
Python
35 lines
1.1 KiB
Python
"""Content-addressed file storage for driver packages."""
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import hashlib
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from pathlib import Path
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class DriverStore:
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"""SHA256 content-addressed file storage for printer driver packages.
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Files are stored as DRIVERS_DIR/{sha256} so identical uploads are
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deduplicated automatically.
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"""
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def __init__(self, base_dir: str) -> None:
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self._base = Path(base_dir)
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self._base.mkdir(parents=True, exist_ok=True)
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def save(self, data: bytes) -> str:
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"""Persist *data* and return its SHA256 hex digest.
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If the file already exists the write is skipped (deduplication).
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"""
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digest = hashlib.sha256(data).hexdigest()
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dest = self._base / digest
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if not dest.exists():
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dest.write_bytes(data)
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return digest
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def get_path(self, sha256: str) -> Path:
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"""Return the filesystem path for a given SHA256 digest."""
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return self._base / sha256
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def exists(self, sha256: str) -> bool:
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"""Return True if the file for *sha256* exists on disk."""
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return (self._base / sha256).exists()
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