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193 | class SqliteSessions(Sessions):
"""Session storage backed by SQLAlchemy models in a single SQLite
file. Defaults to `~/.pycodeloop/pycodeloop.db`, next to `config.json`
— a generic, app-wide database file, not sessions-only, so other
features can add their own tables to it later."""
def __init__(self, path: str | Path | None = None) -> None:
self.path = Path(path or Path.home() / ".pycodeloop" / "pycodeloop.db")
self.path.parent.mkdir(parents=True, exist_ok=True)
self._engine = create_engine(f"sqlite:///{self.path}")
Base.metadata.create_all(self._engine)
self._session_factory = sessionmaker(bind=self._engine)
self._migrate_legacy_messages()
self._migrate_images_column()
def _db(self) -> OrmSession:
return self._session_factory()
def _migrate_images_column(self) -> None:
"""`create_all()` only creates missing tables, not missing
columns on an existing one — add `images` for databases created
before message attachments existed."""
with self._engine.connect() as conn:
columns = {
row[1] for row in conn.execute(text("PRAGMA table_info(messages)"))
}
if "images" in columns:
return
with self._engine.begin() as conn:
conn.execute(text("ALTER TABLE messages ADD COLUMN images VARCHAR"))
def _migrate_legacy_messages(self) -> None:
"""One-time backfill from the old single-blob `sessions.messages`
column (pre-normalization) into the `messages` table, then drop
that column — it's `NOT NULL` in the old schema, so leaving it
behind would break every future insert."""
with self._engine.connect() as conn:
columns = {
row[1] for row in conn.execute(text("PRAGMA table_info(sessions)"))
}
if "messages" not in columns:
return
with self._engine.connect() as conn:
rows = conn.execute(
text("SELECT key, messages FROM sessions WHERE messages IS NOT NULL")
).fetchall()
if rows:
with self._db() as db:
for key, blob in rows:
already_migrated = (
db.query(MessageRecord)
.filter(MessageRecord.session_key == key)
.first()
is not None
)
if already_migrated:
continue
try:
items = json.loads(blob)
except (TypeError, ValueError):
continue
for position, item in enumerate(items):
db.add(
MessageRecord(
session_key=key,
position=position,
role=item.get("role", ""),
content=str(item.get("content", "")),
tool_call_id=item.get("tool_call_id"),
tool_calls=(
json.dumps(item["tool_calls"])
if item.get("tool_calls")
else None
),
)
)
db.commit()
with self._engine.begin() as conn:
conn.execute(text("ALTER TABLE sessions DROP COLUMN messages"))
def post(self, key: str, session: Session) -> None:
with self._db() as db:
record = db.get(SessionRecord, key)
if record is None:
record = SessionRecord(key=key)
db.add(record)
record.system_prompt = session.system_prompt
record.cwd = session.cwd
record.updated_at = time.time()
record.message_count = len(session.messages)
db.query(MessageRecord).filter(MessageRecord.session_key == key).delete()
for position, message in enumerate(session.messages):
db.add(
MessageRecord(
session_key=key,
position=position,
role=message.role,
content=str(message.content),
tool_call_id=message.tool_call_id,
tool_calls=(
json.dumps(message.tool_calls)
if message.tool_calls
else None
),
images=(json.dumps(message.images) if message.images else None),
)
)
db.commit()
def get(self, key: str) -> Session | None:
with self._db() as db:
record = db.get(SessionRecord, key)
if record is None:
return None
rows = (
db.query(MessageRecord)
.filter(MessageRecord.session_key == key)
.order_by(MessageRecord.position)
.all()
)
return Session(
system_prompt=record.system_prompt,
cwd=record.cwd,
messages=[
Message(
role=row.role,
content=row.content,
tool_call_id=row.tool_call_id,
tool_calls=(
json.loads(row.tool_calls) if row.tool_calls else None
),
images=json.loads(row.images) if row.images else None,
)
for row in rows
],
)
def delete(self, key: str) -> None:
with self._db() as db:
record = db.get(SessionRecord, key)
if record is not None:
db.delete(record)
db.query(MessageRecord).filter(MessageRecord.session_key == key).delete()
db.commit()
def list_sessions(self) -> dict:
"""key -> {updated_at, message_count, cwd}"""
with self._db() as db:
records = db.query(SessionRecord).all()
return {
r.key: {
"updated_at": r.updated_at,
"message_count": r.message_count,
"cwd": r.cwd,
}
for r in records
}
|