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database.py
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database.py
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from __future__ import annotations
import functools
import uuid
from typing import Any, Callable, Optional, cast
from urllib.parse import urlsplit
from sqlalchemy import create_engine, select
from sqlalchemy.orm import Session
from sqlalchemy.orm import sessionmaker as _sessionmaker
from ragna.core import RagnaException
from . import orm, schemas
def get_sessionmaker(database_url: str) -> Callable[[], Session]:
components = urlsplit(database_url)
if components.scheme == "sqlite":
connect_args = dict(check_same_thread=False)
else:
connect_args = dict()
engine = create_engine(database_url, connect_args=connect_args)
orm.Base.metadata.create_all(bind=engine)
return _sessionmaker(autocommit=False, autoflush=False, bind=engine)
@functools.lru_cache(maxsize=1024)
def _get_user_id(session: Session, username: str) -> uuid.UUID:
user: Optional[orm.User] = session.execute(
select(orm.User).where(orm.User.name == username)
).scalar_one_or_none()
if user is None:
# Add a new user if the current username is not registered yet. Since this is
# behind the authentication layer, we don't need any extra security here.
user = orm.User(id=uuid.uuid4(), name=username)
session.add(user)
session.commit()
return cast(uuid.UUID, user.id)
def add_document(
session: Session, *, user: str, document: schemas.Document, metadata: dict[str, Any]
) -> None:
session.add(
orm.Document(
id=document.id,
user_id=_get_user_id(session, user),
name=document.name,
metadata_=metadata,
)
)
session.commit()
def _orm_to_schema_document(document: orm.Document) -> schemas.Document:
return schemas.Document(id=document.id, name=document.name)
@functools.lru_cache(maxsize=1024)
def get_document(
session: Session, *, user: str, id: uuid.UUID
) -> tuple[schemas.Document, dict[str, Any]]:
document = session.execute(
select(orm.Document).where(
(orm.Document.user_id == _get_user_id(session, user))
& (orm.Document.id == id)
)
).scalar_one_or_none()
return _orm_to_schema_document(document), document.metadata_
def add_chat(session: Session, *, user: str, chat: schemas.Chat) -> None:
document_ids = {document.id for document in chat.metadata.documents}
documents = (
session.execute(select(orm.Document).where(orm.Document.id.in_(document_ids)))
.scalars()
.all()
)
if len(documents) != len(document_ids):
raise RagnaException(
str(set(document_ids) - {document.id for document in documents})
)
session.add(
orm.Chat(
id=chat.id,
user_id=_get_user_id(session, user),
name=chat.metadata.name,
documents=documents,
source_storage=chat.metadata.source_storage,
assistant=chat.metadata.assistant,
params=chat.metadata.params,
prepared=chat.prepared,
)
)
session.commit()
def _orm_to_schema_chat(chat: orm.Chat) -> schemas.Chat:
documents = [
schemas.Document(id=document.id, name=document.name)
for document in chat.documents
]
messages = [
schemas.Message(
id=message.id,
role=message.role,
content=message.content,
sources=[
schemas.Source(
id=source.id,
document=_orm_to_schema_document(source.document),
location=source.location,
content=source.content,
num_tokens=source.num_tokens,
)
for source in message.sources
],
timestamp=message.timestamp,
)
for message in chat.messages
]
return schemas.Chat(
id=chat.id,
metadata=schemas.ChatMetadata(
name=chat.name,
documents=documents,
source_storage=chat.source_storage,
assistant=chat.assistant,
params=chat.params, # type: ignore[arg-type]
),
messages=messages,
prepared=chat.prepared,
)
def get_chats(session: Session, *, user: str) -> list[schemas.Chat]:
return [
_orm_to_schema_chat(chat)
for chat in session.execute(
select(orm.Chat).where(orm.Chat.user_id == _get_user_id(session, user))
)
.scalars()
.all()
]
def _get_orm_chat(session: Session, *, user: str, id: uuid.UUID) -> orm.Chat:
chat: Optional[orm.Chat] = session.execute(
select(orm.Chat).where(
(orm.Chat.id == id) & (orm.Chat.user_id == _get_user_id(session, user))
)
).scalar_one_or_none()
if chat is None:
raise RagnaException()
return chat
def get_chat(session: Session, *, user: str, id: uuid.UUID) -> schemas.Chat:
return _orm_to_schema_chat(_get_orm_chat(session, user=user, id=id))
def _schema_to_orm_source(session: Session, source: schemas.Source) -> orm.Source:
orm_source: Optional[orm.Source] = session.execute(
select(orm.Source).where(orm.Source.id == source.id)
).scalar_one_or_none()
if orm_source is None:
orm_source = orm.Source(
id=source.id,
document_id=source.document.id,
location=source.location,
content=source.content,
num_tokens=source.num_tokens,
)
session.add(orm_source)
session.commit()
session.refresh(orm_source)
return orm_source
def _schema_to_orm_message(
session: Session, chat_id: uuid.UUID, message: schemas.Message
) -> orm.Message:
orm_message: Optional[orm.Message] = session.execute(
select(orm.Message).where(orm.Message.id == message.id)
).scalar_one_or_none()
if orm_message is None:
orm_message = orm.Message(
id=message.id,
chat_id=chat_id,
content=message.content,
role=message.role,
sources=[
_schema_to_orm_source(session, source=source)
for source in message.sources
],
timestamp=message.timestamp,
)
session.add(orm_message)
session.commit()
session.refresh(orm_message)
return orm_message
def update_chat(session: Session, user: str, chat: schemas.Chat) -> None:
orm_chat = _get_orm_chat(session, user=user, id=chat.id)
orm_chat.prepared = chat.prepared
orm_chat.messages = [
_schema_to_orm_message(session, chat_id=chat.id, message=message)
for message in chat.messages
]
session.commit()
def delete_chat(session: Session, user: str, id: uuid.UUID) -> None:
orm_chat = _get_orm_chat(session, user=user, id=id)
session.delete(orm_chat) # type: ignore[no-untyped-call]
session.commit()