Oleksandr Kozachuk
88 lines
4.0 KiB
Python
88 lines
4.0 KiB
Python
"""SQLite persistence for history + memory (SPEC-009).
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One database per deployment, stdlib sqlite3 only (D-010). Callers run
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the sync methods in a worker thread (`asyncio.to_thread`) so the
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event loop never blocks on disk (PER-05 / D6).
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"""
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import logging
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import os
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import pickle
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import sqlite3
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from contextlib import closing
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from pathlib import Path
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from typing import Any, Dict, List, Optional
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SCHEMA_VERSION = 1
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class PersistentStore:
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def __init__(self, db_path: Path) -> None:
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self.db_path = Path(db_path)
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self._init_db()
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def _connect(self) -> sqlite3.Connection:
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conn = sqlite3.connect(self.db_path)
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conn.execute("PRAGMA journal_mode=WAL")
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return conn
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def _init_db(self) -> None:
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self.db_path.parent.mkdir(parents=True, exist_ok=True)
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with closing(self._connect()) as conn, conn:
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if conn.execute("PRAGMA user_version").fetchone()[0] < SCHEMA_VERSION:
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conn.execute(
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"CREATE TABLE IF NOT EXISTS history (id INTEGER PRIMARY KEY, channel TEXT NOT NULL, role TEXT NOT NULL, content TEXT NOT NULL)"
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)
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conn.execute("CREATE INDEX IF NOT EXISTS history_channel ON history (channel)")
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conn.execute("CREATE TABLE IF NOT EXISTS memory (channel TEXT PRIMARY KEY, content TEXT NOT NULL)")
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conn.execute(f"PRAGMA user_version = {SCHEMA_VERSION}")
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os.chmod(self.db_path, 0o600) # conversation data (PER-04)
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def load_history(self, channel: str) -> List[Dict[str, Any]]:
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with closing(self._connect()) as conn:
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rows = conn.execute("SELECT role, content FROM history WHERE channel = ? ORDER BY id", (channel,)).fetchall()
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return [{"role": role, "content": content} for role, content in rows]
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def save_history(self, channel: str, history: List[Dict[str, Any]]) -> None:
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# Full replace per save: histories are small (<= history-limit)
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# and trims must be reflected (D-011)
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with closing(self._connect()) as conn, conn:
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conn.execute("DELETE FROM history WHERE channel = ?", (channel,))
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conn.executemany(
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"INSERT INTO history (channel, role, content) VALUES (?, ?, ?)",
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[(channel, str(entry.get("role", "user")), str(entry.get("content", ""))) for entry in history],
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)
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def load_memory(self, channel: str) -> Optional[str]:
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with closing(self._connect()) as conn:
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row = conn.execute("SELECT content FROM memory WHERE channel = ?", (channel,)).fetchone()
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return row[0] if row else None
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def save_memory(self, channel: str, content: str) -> None:
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with closing(self._connect()) as conn, conn:
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conn.execute(
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"INSERT INTO memory (channel, content) VALUES (?, ?) ON CONFLICT(channel) DO UPDATE SET content = excluded.content",
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(channel, content),
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)
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def migrate_pickles(self, channel: str, history_file: Path, memory_file: Path) -> None:
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"""Import legacy pickles once; rename them *.migrated (PER-03)."""
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if self.load_history(channel) or self.load_memory(channel) is not None:
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return
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if history_file.exists():
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try:
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with open(history_file, "rb") as fd:
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self.save_history(channel, pickle.load(fd))
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history_file.rename(history_file.with_name(history_file.name + ".migrated"))
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logging.info(f"migrated legacy history pickle for {channel}")
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except Exception as err:
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logging.error(f"failed to migrate history pickle {history_file}: {err!r}")
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if memory_file.exists():
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try:
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with open(memory_file, "rb") as fd:
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self.save_memory(channel, str(pickle.load(fd)))
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memory_file.rename(memory_file.with_name(memory_file.name + ".migrated"))
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logging.info(f"migrated legacy memory pickle for {channel}")
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except Exception as err:
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logging.error(f"failed to migrate memory pickle {memory_file}: {err!r}")
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