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103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
"""
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Database models and session.
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The database is a SQLite database, and is stored in the root
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of the project as `db.sqlite3`.
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The database is managed using Alembic, and migrations
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are stored in the `migrations/` directory.
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The module defines the following models:
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- `Repo`: A repository that is being tracked.
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- `Dependency`: A dependency of a repository.
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- `RepoDependency`: A relationship between a repository and a dependency.
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The database is accessed asynchronously using SQLAlchemy's async API.
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"""
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from pathlib import PurePath
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from typing import Final
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from sqlalchemy import BigInteger, ForeignKey, MetaData, String, Text, UniqueConstraint
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from sqlalchemy.ext.asyncio import (
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AsyncAttrs,
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AsyncEngine,
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import (
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Mapped,
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declarative_base,
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mapped_column,
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relationship,
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)
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from app.types import RevisionHash, SourceGraphRepoId
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_DB_PATH: Final[PurePath] = PurePath(__file__).parent.parent / "db.sqlite3"
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_SQLALCHEMY_DATABASE_URL: Final[str] = f"sqlite+aiosqlite:///{_DB_PATH}"
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engine: Final[AsyncEngine] = create_async_engine(_SQLALCHEMY_DATABASE_URL)
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async_session_maker: Final[async_sessionmaker[AsyncSession]] = async_sessionmaker(
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engine, expire_on_commit=False, autoflush=False, autocommit=False
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)
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metadata = MetaData(
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naming_convention={
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"ix": "ix_%(table_name)s_%(column_0_N_name)s ",
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"uq": "uq_%(table_name)s_%(column_0_N_name)s ",
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"ck": "ck_%(table_name)s_%(constraint_name)s ",
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"fk": "fk_%(table_name)s_%(column_0_N_name)s_%(referred_table_name)s",
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"pk": "pk_%(table_name)s",
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}
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)
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Base = declarative_base(metadata=metadata, cls=AsyncAttrs)
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class Repo(Base):
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"""A repository that is being tracked."""
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__tablename__ = "repo"
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id: Mapped[int] = mapped_column(primary_key=True)
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url: Mapped[str] = mapped_column(nullable=False, unique=True)
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description: Mapped[str] = mapped_column(Text, nullable=False)
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stars: Mapped[int] = mapped_column(BigInteger, nullable=False)
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source_graph_repo_id: Mapped[SourceGraphRepoId | None] = mapped_column(
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BigInteger, nullable=True, unique=True
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)
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dependencies: Mapped[list["Dependency"]] = relationship(
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"Dependency", secondary="repo_dependency", back_populates="repos"
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)
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last_checked_revision: Mapped[RevisionHash | None] = mapped_column(
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String(255), nullable=True
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)
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__table_args__ = (UniqueConstraint("url", "source_graph_repo_id"),)
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class Dependency(Base):
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"""A dependency of a repository."""
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__tablename__ = "dependency"
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id: Mapped[int] = mapped_column(primary_key=True)
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name: Mapped[str] = mapped_column(String(255), nullable=False, unique=True)
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repos: Mapped[list["Repo"]] = relationship(
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"Repo", secondary="repo_dependency", back_populates="dependencies"
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)
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class RepoDependency(Base):
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"""A relationship between a repository and a dependency."""
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__tablename__ = "repo_dependency"
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repo_id: Mapped[int] = mapped_column(
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ForeignKey(Repo.id, ondelete="CASCADE"), primary_key=True
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)
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dependency_id: Mapped[int] = mapped_column(
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ForeignKey(Dependency.id, ondelete="CASCADE"), primary_key=True
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)
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