Add Alembic setup

alembic/README

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+Generic single-database configuration.

alembic/env.py

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+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config, pool
+
+from alembic import context
+
+import sys
+from os.path import abspath, dirname
+
+sys.path.insert(0, dirname(dirname(abspath(__file__))))
+
+from mautrix.util.db import Base
+from maubot.config import Config
+from maubot import db
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+maubot_config_path = context.get_x_argument(as_dictionary=True).get("config", "config.yaml")
+maubot_config = Config(maubot_config_path, None)
+maubot_config.load()
+config.set_main_option("sqlalchemy.url", maubot_config["database"].replace("%", "%%"))
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

alembic/versions/d295f8dcfa64_initial_revision.py

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+"""Initial revision
+
+Revision ID: d295f8dcfa64
+Revises: 
+Create Date: 2019-09-27 00:21:02.527915
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd295f8dcfa64'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('client',
+    sa.Column('id', sa.String(length=255), nullable=False),
+    sa.Column('homeserver', sa.String(length=255), nullable=False),
+    sa.Column('access_token', sa.Text(), nullable=False),
+    sa.Column('enabled', sa.Boolean(), nullable=False),
+    sa.Column('next_batch', sa.String(length=255), nullable=False),
+    sa.Column('filter_id', sa.String(length=255), nullable=False),
+    sa.Column('sync', sa.Boolean(), nullable=False),
+    sa.Column('autojoin', sa.Boolean(), nullable=False),
+    sa.Column('displayname', sa.String(length=255), nullable=False),
+    sa.Column('avatar_url', sa.String(length=255), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('plugin',
+    sa.Column('id', sa.String(length=255), nullable=False),
+    sa.Column('type', sa.String(length=255), nullable=False),
+    sa.Column('enabled', sa.Boolean(), nullable=False),
+    sa.Column('primary_user', sa.String(length=255), nullable=False),
+    sa.Column('config', sa.Text(), nullable=False),
+    sa.ForeignKeyConstraint(['primary_user'], ['client.id'], onupdate='CASCADE', ondelete='RESTRICT'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('plugin')
+    op.drop_table('client')
+    # ### end Alembic commands ###