25 lines
807 B
Python
25 lines
807 B
Python
"""
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db_snapshot.py — WAL-safe snapshot / restore helpers for seismo_relay.db and
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the waveform store, backing the /db/snapshot, /db/waveforms/recent.zip and
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/db/restore endpoints in server.py. Kept out of server.py so the logic is
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unit-testable without HTTP.
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"""
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from __future__ import annotations
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import sqlite3
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from pathlib import Path
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def snapshot_db(src_path: Path, dest_path: Path) -> Path:
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"""WAL-safe copy of a live SQLite DB via the SQLite online backup API.
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Consistent even while the source is being written under WAL, and never
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blocks the source's writers."""
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src = sqlite3.connect(str(src_path))
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dest = sqlite3.connect(str(dest_path))
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try:
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with dest:
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src.backup(dest)
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finally:
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src.close()
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dest.close()
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return Path(dest_path)
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